CN101975055A - Method for remediating trouble well of coal bed gas multi-branch horizontal well - Google Patents
Method for remediating trouble well of coal bed gas multi-branch horizontal well Download PDFInfo
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- CN101975055A CN101975055A CN2010102862635A CN201010286263A CN101975055A CN 101975055 A CN101975055 A CN 101975055A CN 2010102862635 A CN2010102862635 A CN 2010102862635A CN 201010286263 A CN201010286263 A CN 201010286263A CN 101975055 A CN101975055 A CN 101975055A
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Abstract
The embodiment of the invention discloses a method for remediating a trouble well of a coal bed gas multi-branch horizontal well, which comprises the steps of: determining a new target spot on a position over 1m away from a communicating point of the horizontal well and a production straight well cave; putting a packer for packing in the lower end of a straight well section or an angle building section of the horizontal well; cutting a second section sleeve on the free section of the second section sleeve in the straight well section, lifting the second section sleeve above a cutting point out of the well; setting a side tracking point at a position above 20m away from the cutting point in the straight well section of the horizontal well; and sealing the wellbore of the original horizontal well below the side tracking point. In the embodiment of the invention, the horizontal section of the horizontal well is drilled again above the horizontal section of the original horizontal well to ensure that the horizontal section of a new horizontal well and the horizontal section of the original horizontal section are not on the same plane, thus even if the caught-on position is nearer to the production straight well cave, the wellhole of the new horizontal well is not influenced. Therefore, the caught on in the original horizontal well is avoided, and the influence caused by the blockage in the wellhole by the caught is prevented.
Description
Technical field
The present invention relates to the coal-bed gas exploitation field, more particularly, relate to a kind of means to save the situation of coal bed gas multi-branched horizontal well accident well.
Background technology
In the process of wellbore construction, down-hole accident can might take place in coal bed gas multilateral well, horizontal well or U type butt shaft; In down-hole accident, the down-hole bit freezing may cause drilling tool to be buried to stay in the well that has been drilled to and form fish.In this area, fish be meant because of a variety of causes cause stay in the well such as drilling rod, drill collar, drill bit or salvage all kinds of instruments etc. of usefulness.Because the fish in the well will completely or partially be stopped up well, thereby, the further construction of coal bed gas well and follow-up gas production effect can be influenced.
At present, at the solution that leaves the fish well after the accident be, the judgement fish is adopted the distance in straight well cave apart from row earlier, when distance long enough (being meant more than at least 50 meters generally speaking), when not influencing sidetracking, can carry out sidetracking in the anterior position of fish, thereby the accident point of walking around the fish place is finished follow-up coal seam drilling depth.Thereby making that completed row adopts straight well in the accident well can continue to utilize, the utilization that completed horizontal well coal seam horizontal segment also can part.
But at present, when fish is adopted straight well cave very near (being meant at least 50 meters generally speaking) apart from row, in the time of can't carrying out sidetracking, generally speaking, this accident well will engineering be scrapped, thereby causes great loss.And the row after engineering is scrapped adopts straight well and horizontal well all can't utilize probably again, so also need to arrange the construction again of adopting straight well and horizontal well, so also can prolong whole construction period.
In sum, to adopt the straight well cave apart from row very near when fish, in the time of can't carrying out sidetracking, and continuation utilization that can't realization accident well in the prior art, thus caused serious economy loss.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of means to save the situation of coal bed gas multi-branched horizontal well accident well, to realize that to adopt the straight well cave apart from row very near and can't carry out sidetracking the time, can continue to utilize the purpose of accident well when fish.
The embodiment of the invention is achieved in that
A kind of means to save the situation of coal bed gas multi-branched horizontal well accident well comprises step:
Adopt on the connectivity points in straight well cave the position more than 1 meter distance horizontal well and row and determine novel targets;
At the straight well section lower end or the inclination section of horizontal well, be lowered to packer and implement packing;
Two opening the free section cutting two of sleeve pipe and drive sleeve pipe in the straight well section, and cut point is driven sleeve pipe with two of top propose outside the well; In horizontal well straight well section, side tracking point is set apart from the position of described cut point more than 20 meters; The former horizontal well well that sealing side tracking point position is following;
With described side tracking point is that starting point is drilled with new height well horizontal segment; Described new height well horizontal segment passes described novel targets, and new height well horizontal segment is higher than former horizontal well horizontal segment more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that described new height well horizontal segment track horizontal projection is.
Preferably, in embodiments of the present invention, described new height well horizontal segment is higher than 1 to 4 meter of former horizontal well horizontal segment.
Preferably, in embodiments of the present invention, described new height well horizontal segment is higher than former horizontal well horizontal segment more than 2.5 meters.
Preferably, in embodiments of the present invention, described decide the new height well and pass novel targets after, the angle of the vertical plane of the horizontal segment track of new height hoistway and former horizontal well is greater than 8 degree.
Preferably, in embodiments of the present invention, described angle is 10 to 20 degree.
The embodiment of the invention also provides the means to save the situation of another kind of coal bed gas multi-branched horizontal well accident well, comprises step:
Adopt on the connectivity points in straight well cave the position more than 1 meter distance horizontal well and row and determine novel targets;
Straight well section lower end or inclination section at horizontal well are lowered to packer enforcement packing;
In horizontal well, above the packer and be the position of straight well section, set side tracking point;
With described side tracking point is that starting point is drilled with new height well horizontal segment in the mode of windowing; Described new height well horizontal segment is higher than former horizontal well horizontal segment more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that described new height well horizontal segment track horizontal projection is; Described new height well passes described novel targets.
Preferably, in embodiments of the present invention, described new height well horizontal segment is higher than 1 to 4 meter of former horizontal well horizontal segment.
Preferably, in embodiments of the present invention, described new height well horizontal segment is higher than former horizontal well horizontal segment more than 2.5 meters.
Preferably, in embodiments of the present invention, described decide the new height well and pass novel targets after, the angle of the vertical plane of the horizontal segment track of new height well horizontal segment and former horizontal well is greater than 8 degree.
Preferably, in embodiments of the present invention, described angle is 10 to 20 degree.
From above-mentioned technical scheme as can be seen, the embodiment of the invention is by being drilled with the horizontal segment of horizontal well again above the previous level well, make new height well horizontal segment and previous level well horizontal segment not on same horizontal plane, so that even the straight well cave is adopted apart from row in the position of fish is very near, also can not influence the well of new height well.Thereby got around fish in the former horizontal well, avoided fish to stop up the influence that well causes.
In addition, in the embodiment of the invention, also the horizontal segment by the new height well be set to depart from former horizontal well horizontal segment directly over, thereby avoided in the work progress of new height well or be drilled with finish after, if former horizontal well caves in, can influence the situation of the construction or the use of new height well.
Utilizing original row to adopt in the embodiment of the invention has avoided the influence that distance row adopts the very near fish in straight well cave effectively, has avoided row to adopt scrapping of straight well and horizontal well under the situation of straight well and horizontal well.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of the means to save the situation of the accident of coal bed gas multi-branched horizontal well described in embodiment of the invention well;
Fig. 2 is the flow chart of the means to save the situation of the accident of coal bed gas multi-branched horizontal well described in further embodiment of this invention well.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
In the practice of construction process, some down-hole accident and to stay fish be to occur in when deflecting to finish, and good sleeve pipe down, and after sleeve pipe finished well cementing of cement.At this moment, if the position of fish is very near apart from the diameter cave, can't carries out sidetracking and walk around fish, to utilize the accident well in order continuing in this case, to avoid loss, the embodiment of the invention provides a kind of means to save the situation of coal bed gas multi-branched horizontal well accident well, as shown in Figure 1, comprise step:
S11, adopt on the connectivity points in straight well cave the position more than 1 meter distance horizontal well and row and determine novel targets;
The embodiment of the invention is drilled with the horizontal segment of horizontal well by utilizing the Vertical Well section of original horizontal well again in described Vertical Well section, and walks around the fish position and realize continuation utilization to original accident well.Because the horizontal well hoistway by original cave leaves fish, if the new height well is in same horizontal plane with former horizontal well again, can can't construct because of stopping of fish, so in the embodiment of the invention, novel targets is determined in the position on the connectivity points of adopting the former cave of straight well apart from row more than 1 meter; The novel targets here is meant that the well that is drilled with new horizontal well is adopted row needs the position passed through in the straight well.For fear of of the influence of original cave to new height well hoistway, in embodiments of the present invention, also set the safe distance in novel targets and original cave, at least to guarantee more than 1 meter, collapse thereby avoid causing, and then influence is constructed because the coal seam support force between new height well and the original cave is too small.
S12, at the straight well section lower end or the inclination section of horizontal well, be lowered to packer and implement packing;
In the embodiment of the invention,,, make the straight well Duan Yuyuan horizontal well horizontal segment of horizontal well and row adopt straight well realization isolation so can use packer in sleeve pipe, to set because the horizontal well inclination section has been finished setting of casing.By straight well Duan Yuyuan horizontal segment is isolated, thereby can when the original horizontal well straight well section of recycling, not be subjected to the influence of previous level well inclination section.
S13, two opening the free section cutting two of sleeve pipe and drive sleeve pipe in the straight well section, and cut point is driven sleeve pipe with two of top propose outside the well; In horizontal well straight well section, side tracking point is set apart from the position of described cut point more than 20 meters; The well section that sealing side tracking point position is following;
Because in the embodiment of the invention, need be drilled with the horizontal segment well again in the straight well section of previous level well, so, need open outside the part cutting and proposition well of free section in the sleeve pipe, two in order to expose the open hole borehole wall that can be drilled with new height section deflecting the boring section;
Because two to drive sleeve pipe be metal material, two the latter halfs of driving sleeve pipe produce magnetic disturbance to the drill bit in the follow-up construction in the horizontal well for fear of staying, so apart from the position of described cut point more than 20 meters side tracking point is set in horizontal well straight well section.Then, the construction of sidetracking can also be adopted the cement sealing horizontal hole for convenience, and the position of sealing arrives described side tracking point position and gets final product.
S14, be that starting point is drilled with the new height well with described side tracking point; Described new height well horizontal segment is higher than former horizontal well horizontal segment more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that the horizontal projection of described new height well horizontal segment track is; Described new height well passes described novel targets.
By above the previous level well, being drilled with horizontal well again, make the horizontal segment of new height well and previous level well horizontal segment not on same horizontal plane, so that even the straight well cave is adopted apart from row in the position of fish is very near, also can not influence the horizontal segment well of new height well.Thereby got around fish in the former horizontal well horizontal segment, avoided fish to stop up the influence that well causes.
In embodiments of the present invention, in the work progress of new height well or be drilled with finish after, cave in as former horizontal well, cross when near from former horizontal well when the new height well spacing, can influence the construction or the use of new height well, such as related cave in etc. that can cause the new height well.So the new height well need maintain a certain distance to avoid influence with former horizontal well; In embodiments of the present invention, safe distance can be set at, at least will be more than 1 meter near the cave, other well section keeps 2.5 meters space length at least.
Because the vertical discrepancy in elevation between two wells and the angle of deviation have determined the space length of the two, distance is big more, and the interference between two wells is just more little.In order better to avoid the influence of former horizontal well, the height of new height well horizontal segment is not only than former horizontal well horizontal segment height, but also to avoid directly over the horizontal segment of former horizontal well, concrete method can be, the track horizontal projection of new horizontal well well is arc, promptly beginning from side tracking point and the previous level well section direction that staggers, promptly, with the direction of the accident well section that leaves fish an angle is arranged so that new height well horizontal segment well as far as possible not directly over the horizontal segment of former horizontal well, the horizontal segment well of new height well is again with an arc trajectory wraparound and pass novel targets then.Can avoid the horizontal segment of former horizontal well to collapse so effectively, also reduce the magnetic interference of fish for measurement while-drilling instrument in the new well drilling tool to the influence of new height well well.
Concrete, in embodiments of the present invention, after having sealed the former horizontal well well below the side tracking point admittedly, begin drilling well from the side tracking point that configures, the track of new well of boring is at initial segment, need certain included angle be arranged with the orientation of former horizontal well horizontal segment track, so that new side-tracked hole leaves former horizontal segment well as early as possible.Because new height well horizontal segment need pass novel targets, so new height well horizontal segment has the direction of certain included angle to advance behind the segment distance at the vertical plane along former horizontal well horizontal segment track, also to adjust direction, advance to the novel targets position.Like this, the track horizontal projection of new height well horizontal segment then becomes arc.Because the horizontal segment horizontal projection of new horizontal well is arc, after so it adopts the novel targets of straight well through row, also must have certain included angle with the direction of the horizontal segment track of former horizontal well, like this, though pass new height well well behind the novel targets above former horizontal well well, but be not in directly over the well of former horizontal well, caving in to the influence of new height well well of former horizontal well well below so just having avoided also reduced the magnetic interference of fish for measurement while-drilling instrument in the new well drilling tool.
In embodiments of the present invention, described decide the new height well and pass novel targets after, the angle of the vertical plane of the horizontal segment track of new height hoistway and former horizontal well is controlled to be greater than 8 degree.Preferably, described angle can also be controlled to be 10 to 20 degree.
In embodiments of the present invention, by being drilled with horizontal well again in original above position of leaving the horizontal well of fish, and the horizontal segment by the new height well be set to depart from former horizontal well horizontal segment directly over, thereby avoided the influence that distance row adopts the very near fish in straight well cave under the situation of straight well and horizontal well effectively, avoided row to adopt scrapping of straight well and horizontal well utilizing original row to adopt.
In another embodiment of the present invention, also provide the means to save the situation of another kind of coal bed gas multi-branched horizontal well accident well, as shown in Figure 2, comprised step:
S21, adopt on the connectivity points in straight well cave the position more than 1 meter distance horizontal well and row and determine novel targets;
S22, at the straight well section lower end or the inclination section of horizontal well, be lowered to packer and implement packing;
In the embodiment of the invention, step S11 and step S12 among step S21 and step S22 and the embodiment illustrated in fig. 1 are similar, do not repeat them here.
S23, in horizontal well, above the packer and be the position of straight well section, set side tracking point;
The embodiment of the invention at be the more stable situation of geologic structure, owing to be drilled with well at the stable geological stratification of geologic structure and be not easy to cave in, in horizontal well straight well section, two open the mode that the sleeve pipe uplifting window is drilled with new inclination section and horizontal segment well so can directly adopt.
Because the horizontal segment well that newly is drilled with need be on former net horizontal section well, so side tracking point also will be chosen at the top of kickoff point (KOP).
S24, be that starting point is drilled with the new height well in the mode of windowing with described side tracking point; Described new height well horizontal segment is higher than former horizontal well horizontal segment more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that the horizontal projection of described new height well horizontal segment track is; Described new height well passes described novel targets.
In embodiments of the present invention, except being drilled with the technology difference of new inclination section and horizontal segment, embodiment shown in its principle and Fig. 1 is basic identical, also by above the previous level well, being drilled with horizontal well again, thereby make the horizontal segment of new height well and previous level well horizontal segment not on same horizontal plane, so that even the straight well cave is adopted apart from row in the position of fish is very near, also can not influence the horizontal segment well of new height well.Thereby got around fish in the former horizontal well horizontal segment, avoided fish to stop up the influence that well causes.
In addition, also have with the embodiment shown in Fig. 1 is essentially identical, in the work progress of new height well or be drilled with finish after, cave in as former horizontal well, when the new height well spacing is crossed when near from former horizontal well, can influence the construction or the use of new height well, such as related cave in etc. that can cause the new height well.So the new height well need maintain a certain distance to avoid influence with former horizontal well; In embodiments of the present invention, safe distance can be set at, at least will be more than 1 meter near the cave, other well section keeps 2.5 meters space length at least.
Because the vertical discrepancy in elevation between two wells and the angle of deviation have determined the space length of the two, distance is big more, and the interference between two wells is just more little.In order better to avoid the influence of former horizontal well, the height of new height well horizontal segment is not only than former horizontal well horizontal segment height, but also to avoid directly over the horizontal segment of former horizontal well, concrete method can be, the horizontal projection of new horizontal well track is arc, promptly beginning from side tracking point and the previous level well section direction that staggers, promptly, with the direction of the accident well section that leaves fish an angle is arranged so that new height well horizontal segment well as far as possible not directly over the horizontal segment of former horizontal well, the horizontal segment well of new height well is again with an arc trajectory wraparound and pass novel targets then.Can avoid the horizontal segment of former horizontal well to collapse so effectively, also reduce the magnetic interference of fish for measurement while-drilling instrument in the new well drilling tool to the influence of new height well horizontal segment well.
Concrete, in embodiments of the present invention, after having sealed the former horizontal well well below the side tracking point admittedly, begin drilling well from the side tracking point that configures, the track of new well of boring is at initial segment, need certain included angle be arranged with the orientation of former horizontal well horizontal segment track, with the horizontal segment of avoiding the new height well directly over former horizontal well horizontal segment.Because the new height well need pass novel targets, so the new height well has the direction of certain included angle to advance behind the segment distance at the vertical plane along former horizontal well horizontal segment track, also to adjust direction, advance to the novel targets position.Like this, the track horizontal projection of new height well horizontal segment then becomes arc.Because the horizontal segment horizontal projection of new horizontal well is arc, after so it adopts the novel targets of straight well through row, also must have certain included angle with the direction of the horizontal segment track of former horizontal well, like this, though pass new height well well behind the novel targets above former horizontal well well, but be not in directly over the well of former horizontal well, so just avoided the caving in of former horizontal well well of below the influence of new height well well.
In embodiments of the present invention, described decide the new height well and pass novel targets after, the angle of the vertical plane of the horizontal segment track of new height hoistway and former horizontal well is controlled to be greater than 8 degree.Preferably, described angle can also be controlled to be 10 to 20 degree.
Each embodiment adopts the mode of going forward one by one to describe in this manual, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (10)
1. the means to save the situation of a coal bed gas multi-branched horizontal well accident well is characterized in that, comprises step:
Adopt on the connectivity points in straight well cave the position more than 1 meter distance horizontal well and row and determine novel targets;
Straight well section lower end or inclination section at horizontal well are lowered to packer enforcement packing;
Two opening the free section cutting two of sleeve pipe and drive sleeve pipe in the straight well section, and cut point is driven sleeve pipe with two of top propose outside the well; In horizontal well straight well section, side tracking point is set apart from the position of described cut point more than 20 meters; The former horizontal well well that sealing side tracking point position is following;
With described side tracking point is that starting point is drilled with new height well horizontal segment; Described new height well passes described novel targets, and new height well horizontal segment is higher than former horizontal well horizontal segment more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that the horizontal projection of described new height well horizontal segment track is.
2. according to the described method of claim 1, it is characterized in that described new height well horizontal segment is higher than 1 to 4 meter of former horizontal well horizontal segment.
3. according to the described method of claim 2, it is characterized in that described new height well horizontal segment is higher than former horizontal well horizontal segment more than 2.5 meters.
4. according to the described method of claim 1, it is characterized in that, described decide the new height well and pass novel targets after, the angle in the orientation of new height well horizontal segment and former horizontal well horizontal segment track is greater than 8 degree.
5. according to the described method of claim 4, it is characterized in that described angle is 10 to 20 degree.
6. the means to save the situation of a coal bed gas multi-branched horizontal well accident well is characterized in that, comprises step:
Adopt on the connectivity points in straight well cave the position more than 1 meter distance horizontal well and row and determine novel targets;
Straight well section lower end or inclination section at horizontal well are lowered to packer enforcement packing;
In horizontal well, above the packer and be the former kickoff point (KOP) top position of straight well section, set side tracking point;
With described side tracking point is that starting point is drilled with new height well horizontal segment in the mode of windowing; Described new height well horizontal segment is higher than former horizontal well horizontal segment more than 1 meter; It is arc to depart from directly over the former horizontal well horizontal segment that the horizontal projection of described new height well horizontal segment track is; Described new height well horizontal segment passes described novel targets.
7. according to the described method of claim 6, it is characterized in that described new height well horizontal segment is higher than 1 to 4 meter of former horizontal well horizontal segment.
8. according to the described method of claim 7, it is characterized in that described new height well horizontal segment is higher than former horizontal well horizontal segment more than 2.5 meters.
9. according to the described method of claim 6, it is characterized in that, described decide new height well horizontal segment and pass novel targets after, the angle in the orientation of the horizontal segment track of new height well and former horizontal well is greater than 8 degree.
10. according to the described method of claim 9, it is characterized in that described angle is 10 to 20 degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010286263 CN101975055B (en) | 2010-09-17 | 2010-09-17 | Method for remediating trouble well of coal bed gas multi-branch horizontal well |
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| CN 201010286263 CN101975055B (en) | 2010-09-17 | 2010-09-17 | Method for remediating trouble well of coal bed gas multi-branch horizontal well |
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| CN101975055A true CN101975055A (en) | 2011-02-16 |
| CN101975055B CN101975055B (en) | 2013-03-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107288546A (en) * | 2017-08-16 | 2017-10-24 | 北京奥瑞安能源技术开发有限公司 | The completion method and horizontal well of a kind of horizontal well |
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| US6439320B2 (en) * | 1998-11-20 | 2002-08-27 | Cdx Gas, Llc | Wellbore pattern for uniform access to subterranean deposits |
| US7243738B2 (en) * | 2001-01-29 | 2007-07-17 | Robert Gardes | Multi seam coal bed/methane dewatering and depressurizing production system |
| US20030106686A1 (en) * | 2001-12-06 | 2003-06-12 | Eog Resources Inc. | Method of recovery of hydrocarbons from low pressure formations |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107288546A (en) * | 2017-08-16 | 2017-10-24 | 北京奥瑞安能源技术开发有限公司 | The completion method and horizontal well of a kind of horizontal well |
| CN107288546B (en) * | 2017-08-16 | 2019-05-03 | 北京奥瑞安能源技术开发有限公司 | A kind of completion method and horizontal well of horizontal well |
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| CN101975055B (en) | 2013-03-06 |
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