CN104989358A - Shale gas horizontal well bridge plug separation and ball throwing segmented fracturing process - Google Patents
Shale gas horizontal well bridge plug separation and ball throwing segmented fracturing process Download PDFInfo
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- CN104989358A CN104989358A CN201510339189.1A CN201510339189A CN104989358A CN 104989358 A CN104989358 A CN 104989358A CN 201510339189 A CN201510339189 A CN 201510339189A CN 104989358 A CN104989358 A CN 104989358A
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Abstract
The invention discloses a shale gas horizontal well bridge plug separation and ball throwing segmented fracturing process, which concretely comprises the following steps of: 1, draining, exploring and washing a well tube; 2, performing clustering perforation on a first segment; 3, performing fracturing construction on a first cluster; 4, throwing balls for sealing the first cluster; 5, repeatedly performing the fracturing construction, ball throwing and sealing steps in the third step and the fourth step on a second cluster, a third cluster to an N-th cluster; 6, sealing the first segment by a lower bridge plug, and performing clustering perforation on a second segment; 7, sequentially and repeatedly performing fracturing construction, ball throwing, sealing and lower bridge plug sealing steps in the third, fourth, fifth and sixth steps on the second segment to the N-th segment; and 8, performing sweeping grinding. The process method has the advantages that the design is reasonable; the construction cost is low; the optimum flowing passage of shale gas can be realized by adopting the process method; high economic return is obtained at high speed and high yield; and the fractures can be limited to the most economic positions.
Description
Technical field
The invention belongs to exploitation of oil-gas field technical field, particularly shale gas development technique, be specifically related to a kind of shale gas bridge plug for horizontal well and separate and pitching staged fracturing process.
Background technology
In China, shale gas reserves are very abundant, and reserves reach 30*10 according to statistics
12m
3, potentiality to be exploited is huge.Shale gas reservoir must could form the oil-gas reservoir with economic worth through pressure break.Adopt horizontal well and Staged Fracturing Technique In Horizontal Wells to develop and become current exploiting tech for principal part.In prior art, one be adopt bridging plug separate many showers hole fracturing technology, the shortcoming of this technique be after being difficult to guarantee sub-clustering every bunch all pressed off, limited to the correctional effect of reservoir, be difficult to the object reaching high yield after pressure break.Two is only adopt pitching staged fracturing technique, and this technique also exists following deficiency: 1, this technological requirement once penetrates out whole reservoir, cannot confirm construction well section, more cannot optimal design; If 2 there occurs sand plug, after adopting the process such as open flow, sand washing, the little club of reservoir of shutoff falls in pit shaft, so just cannot carry out the staged fracturing construction of lower step.
Summary of the invention
The object of the invention is to overcome the deficiency in existing shale gas fracturing technique, provide " a kind of shale gas bridge plug for horizontal well is separated and pitching staged fracturing process ".This process be bridge plug for horizontal well separate and the combination of pitching staged fracturing technique, balance and coordination fracturing technology.Adopt this process both can realize the flow channel of shale gas the best, obtain higher economy return with recovery ratio at a relatively high speed, crack can be limited in most economical position again.
To achieve these goals, the present invention is achieved through the following technical solutions: main technical scheme is, a kind of shale gas bridge plug for horizontal well is separated and pitching staged fracturing process, specifically comprises the steps:
1). first logical, visit, well-flushing cylinder, wellbore treatments is clean;
11) drift size gauge tool is adopted to pass to artificial bottom of a well,
12) clear water huge discharge cleans pit shaft,
13) for anti-swollen liquid, positive well-flushing clear water is substituted;
2), sub-clustering perforation is carried out to first paragraph;
3), pressing crack construction is carried out to first bunch;
4), pitching, shutoff first bunch;
5). successively to second bunch, the 3rd bunch until N bunch repeats the 3rd in above-mentioned steps) and the 4th) pressing crack construction, pitching, shutoff step, until the pressing crack construction completing in first paragraph every bunch, pitching, shutoff step;
6), lower bridge plugging first paragraph, sub-clustering perforation is carried out to second segment simultaneously;
7), successively to second segment until N section repeats the 3rd in above-mentioned steps), 4), 5) and 6) pressing crack construction, pitching, shutoff and lower bridge plugging step, until complete N section pressing crack construction;
8) mill is swept
After pressure break terminates, closing well 2 hours, after closing up of cracks, the lower five sharpening footwear be fixedly connected with coiled tubing, mill bridging plug is swept in circulation.
Preferably, described in step 13), anti-swollen liquid adopts concentration to be the TCD-15 of 0.05%.
Preferably, step 2) described in sub-clustering perforation be down to pit shaft assigned address by the perforating gun that is connected in series with lower crawl device, concrete perforating parameter is, the body of a gun is withstand voltage 120MPa, gun shaped 89, perforating bullet type BH42RDX28-2,60 °, phase angle, Kong Jing≤15mm, hole close 19 holes/m, every bunch of length 1-1.5m, perforation number of clusters 2-3 bunch.
Preferably, the pitching described in step 4), shutoff is the size according to Perforation bullet used, and adopt ball injector to throw the ball of corresponding size into, the quantity of pitching is 1.2 times of preforation tunnel quantity; Enter reservoir with pumping fracturing fluid after pitching, carry out shutoff to perforation, pump displacement is 2-3m
3/ min.
Preferably, described fracturing fluid is the one in slippery water or linear glue, and slippery water is prepared by the component of following percentage by weight proportioning: friction reducer 0.07%, gel breaker 0.0095%, bactericide 0.08%, Waterproof lock agent 0.1%, surplus is water, and linear glue is prepared by the component of following percentage by weight proportioning: thickening agent 0.3%, gel breaker 0.012%, bactericide 0.08%, Waterproof lock agent 0.1%, surplus is water.
Preferably, described pitching, shutoff, the material of its pitching balls is solubility low density material, and scribble the thick temperature controlling diaphragm of 0.05mm on ball surface, proportion is 1.2g/cm
3-1.4g/cm
3, maximum operation temperature is 200 degree, and its speed of dissolving is directly proportional to temperature and time.
Preferably, bridging plug material used is polymer composite, and light weight, easily brill, withstand voltage, heatproof, allowable stress is 35-140MPa, heatproof 93-232 DEG C.
Adopt the present invention compared with existing shale gas fracturing technique, tool has the following advantages:
1, this process be bridge plug for horizontal well separate and the combination of pitching staged fracturing technique, balance and coordination fracturing technology.This process is reasonable in design, construction cost is low, adopts this process both can realize the flow channel of shale gas the best, obtains higher economy return at a relatively high speed, crack can be limited in most economical position again with recovery ratio.
2, bridging plug is separated, and adopt bridging plug to separate each section and carry out pressing crack construction, construction reliability is high, simultaneously according to site operation situation, can adjust construction hop count at any time; Even if the problems such as sand plug appear in certain section, be also easy to process, do not affect the pressing crack construction of other sections.
3, reservoir breaks successively, and according to the height of reservoir stress, first pressure construction can make the reservoir fracture that stress is minimum, and when after the minimum reservoir fracture of stress, because reservoir extending pressure is lower than reservoir fracture pressure, showing as operation pressure can significantly reduce, and thus other reservoir can not break.
Accompanying drawing explanation
Fig. 1 adopts fracturing process schematic diagram of the present invention.
In figure: 1, pit shaft, 2, first paragraph, 21, first bunch, 22, second bunch, the 23, the 3rd bunch, 3, second segment, 4, bridging plug, 5, artificial bottom of a well, 6, N section, 7, eyelet.
Detailed description of the invention
Below by non-limiting example, set forth the present invention further, understand the present invention.
Embodiment
As shown in Figure 1, a kind of shale gas bridge plug for horizontal well is separated and pitching staged fracturing process, specifically comprises the steps: in the present invention
1) first logical, visit, well-flushing cylinder, wellbore treatments is clean;
11) adopt drift size gauge tool to be connected with oil pipe thread and pass to artificial bottom of a well,
12) adopt positive well-flushing mode, clean pit shaft with fracturing unit truck clear water huge discharge,
13) adopt concentration be 0.05% TCD-15 prevent swollen liquid, substitute positive well-flushing clear water;
2), sub-clustering perforation is carried out to first paragraph, by the perforating gun that is connected in series with lower crawl device down to pit shaft assigned address, concrete perforating parameter is, the body of a gun is withstand voltage 120MPa, gun shaped 89, perforating bullet type BH42RDX28-2,60 °, phase angle, Kong Jing≤15mm, hole close 19 holes/m, every bunch of length 1-1.5m, perforation number of clusters 2-3 bunch;
3), pressing crack construction is carried out to first bunch, adopt the equipment infusions such as fracturing unit truck, fracturing blender truck, manifold truck, measuring truck, sand tower containing sand slippery water, according to reservoir stress order from low to high, slowly promote infusion pressure, first the reservoir that stress is low breaks, and the low reservoir of counter stress carries out pressing crack construction; Progressively improve operation pressure in work progress, after reservoir obviously breaks, now infusion pressure can significantly decrease, and then operational discharge capacity being brought up to design discharge capacity can carry out pressing crack construction;
4), pitching, shutoff first bunch, puts into ball injector by thrown ball, manual operation ball injector, and ball injector often turns around, and generally has 4-5 ball and enters pit shaft, along with slippery water enter reservoir time, carry out shutoff at eyelet place.The quantity of pitching is 1.2 times of borehole; The size of ball is determined according to different perforating parameters, and namely the size of eyelet determines the size of institute's pitching, and pump displacement is 2-3m
3/ min;
5). repeat the 3rd in above-mentioned steps to second bunch, the 3rd bunch successively) and the 4th) pressing crack construction, pitching, shutoff step, until the pressing crack construction completing in first paragraph every bunch, pitching, shutoff step;
6), lower bridge plugging first paragraph, sub-clustering perforation is carried out to second segment simultaneously; Bridging plug is connected with wellhead equipment with adaptive joint, cable, perforating gun and cable successively, and the bridging plug promoting to be connected with cable by infusion active water enters the set position of first paragraph and second segment, and setting completing then departs from cable;
7), successively to second segment until 16 sections repeat the 3rd in above-mentioned steps), 4), 5) and 6) pressing crack construction, pitching, shutoff and lower bridge plugging step, until complete the 16th section of pressing crack construction;
8) mill is swept
After pressure break terminates, closing well 2 hours, after closing up of cracks, the lower five sharpening footwear be fixedly connected with coiled tubing, mill bridging plug is swept in circulation.
Described fracturing fluid is the one in slippery water or linear glue, slippery water is prepared by the component of following percentage by weight proportioning: friction reducer 0.07%, gel breaker 0.0095%, bactericide 0.08%, Waterproof lock agent 0.1%, surplus is water, linear glue is prepared by the component of following percentage by weight proportioning: thickening agent 0.3%, gel breaker 0.012%, bactericide 0.08%, Waterproof lock agent 0.1%, surplus is water.
Described pitching, shutoff, the material of its pitching balls is solubility low density material, and scribble the thick temperature controlling diaphragm of 0.05mm on ball surface, proportion is 1.2g/cm
3-1.4g/cm
3, maximum operation temperature is 200 degree, and its speed of dissolving is directly proportional to temperature and time.
Bridging plug material used is polymer composite, and light weight, easily brill, withstand voltage, heatproof, allowable stress is 35-140MPa, heatproof 93-232 DEG C.
The present invention is combination, the balance of bridge plug for horizontal well separation and pitching staged fracturing technique and coordinates fracturing technology.This process is reasonable in design, construction cost is low, adopts this process both can realize the flow channel of shale gas the best, obtains higher economy return at a relatively high speed, crack can be limited in again most economical position, and can prevent pressure from wearing water layer with recovery ratio.
Claims (7)
1. shale gas bridge plug for horizontal well is separated and a pitching staged fracturing process, it is characterized in that, specifically comprises the steps:
1). first logical, visit, well-flushing cylinder (1), by clean for pit shaft (1) process;
11) drift size gauge tool is adopted to pass to artificial bottom of a well (5),
12) clear water huge discharge cleans pit shaft (1),
13) for anti-swollen liquid, positive well-flushing clear water is substituted;
2), sub-clustering perforation is carried out to first paragraph (2);
3), pressing crack construction is carried out to first bunch (21);
4), pitching, shutoff first bunch (21);
5), successively to second bunch (22), the 3rd bunch (23) until N bunch repeats the 3rd in above-mentioned steps) and the 4th) pressing crack construction, pitching, shutoff step, until the pressing crack construction completing in first paragraph (2) every bunch, pitching, shutoff step;
6), lower bridging plug (4) shutoff first paragraph (2), sub-clustering perforation is carried out to second segment (3) simultaneously;
7), successively to second segment (3) until N section (6) repeats the 3rd in above-mentioned steps), 4), 5) and 6) pressing crack construction, pitching, shutoff and lower bridging plug (4) shutoff step, until complete N section pressing crack construction;
8), mill is swept
After pressure break terminates, closing well 2 hours, after closing up of cracks, the lower five sharpening footwear be fixedly connected with coiled tubing, mill bridging plug (4) is swept in circulation.
2. a kind of shale gas bridge plug for horizontal well according to claim 1 is separated and pitching staged fracturing process, it is characterized in that, described in step 13), anti-swollen liquid adopts concentration to be the TCD-15 of 0.05%.
3. a kind of shale gas bridge plug for horizontal well according to claim 1 is separated and pitching staged fracturing process, it is characterized in that, step 2) described in sub-clustering perforation be that concrete perforating parameter is by the perforating gun that is connected in series with lower crawl device down to pit shaft assigned address, the body of a gun is withstand voltage 120MPa, gun shaped 89, perforating bullet type BH42RDX28-2,60 °, phase angle Kong Jing≤15mm, hole close 19 holes/m, every bunch of length 1-1.5m, perforation number of clusters 2-3 bunch.
4. a kind of shale gas bridge plug for horizontal well according to claim 1 is separated and pitching staged fracturing process, it is characterized in that, pitching described in step 4), shutoff is the size according to Perforation bullet used, adopt ball injector to throw the ball of corresponding size into, the quantity of pitching is 1.2 times of preforation tunnel (7) quantity; Enter reservoir with pumping fracturing fluid after pitching, carry out shutoff to perforation, pump displacement is 2-3m
3/ min.
5. a kind of shale gas bridge plug for horizontal well according to claim 4 is separated and pitching staged fracturing process, it is characterized in that, described fracturing fluid is the one in slippery water or linear glue, slippery water is prepared by the component of following percentage by weight proportioning: friction reducer 0.07%, gel breaker 0.0095%, bactericide 0.08%, Waterproof lock agent 0.1%, surplus is water; Linear glue is prepared by the component of following percentage by weight proportioning: thickening agent 0.3%, gel breaker 0.012%, bactericide 0.08%, Waterproof lock agent 0.1%, and surplus is water.
6. a kind of shale gas bridge plug for horizontal well according to claim 1 is separated and pitching staged fracturing process, it is characterized in that, described pitching, shutoff, the material of its pitching balls is solubility low density material, scribble the thick temperature controlling diaphragm of 0.05mm on ball surface, proportion is 1.2g/cm
3-1.4g/cm
3, maximum operation temperature is 200 degree, and its speed of dissolving is directly proportional to temperature and time.
7. a kind of shale gas bridge plug for horizontal well according to claim 1 is separated and pitching staged fracturing process, it is characterized in that, bridging plug (4) material used is polymer composite, light weight, easily brill, withstand voltage, heatproof, allowable stress is 35-140MPa, heatproof 93-232 DEG C.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107387049A (en) * | 2016-09-22 | 2017-11-24 | 中国石油天然气股份有限公司 | Refracturing method and system |
| CN107605449A (en) * | 2017-08-03 | 2018-01-19 | 中国石油天然气股份有限公司 | Separate stratum fracfturing method is temporarily blocked up in a kind of pitching for heterogeneous reservoir |
| CN109184651A (en) * | 2018-08-31 | 2019-01-11 | 中国石油大学(北京) | Infinite stages fracturing process is temporarily blocked up in water-jet segmentation |
| CN110130867A (en) * | 2019-04-16 | 2019-08-16 | 中国石油天然气股份有限公司 | A kind of more cluster fracturing process of Slim Hole Sidetracking Technology horizontal well in segments |
| CN110219610A (en) * | 2019-06-20 | 2019-09-10 | 中石化石油工程技术服务有限公司 | A kind of shale gas horizontal well is pumped by bridging device |
| CN110714746A (en) * | 2019-11-28 | 2020-01-21 | 中国华能集团清洁能源技术研究院有限公司 | Sawtooth-shaped fracturing device and method for geothermal system |
| CN111021977A (en) * | 2019-11-22 | 2020-04-17 | 中国石油天然气股份有限公司 | Method for quickly removing soluble bridge plug in case of blocking |
| CN112177583A (en) * | 2019-07-01 | 2021-01-05 | 中国石油化工股份有限公司 | Close cutting fracturing method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107387049B (en) * | 2016-09-22 | 2020-02-14 | 中国石油天然气股份有限公司 | Repeated fracturing method and system |
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| CN109184651A (en) * | 2018-08-31 | 2019-01-11 | 中国石油大学(北京) | Infinite stages fracturing process is temporarily blocked up in water-jet segmentation |
| CN110130867A (en) * | 2019-04-16 | 2019-08-16 | 中国石油天然气股份有限公司 | A kind of more cluster fracturing process of Slim Hole Sidetracking Technology horizontal well in segments |
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| CN110219610A (en) * | 2019-06-20 | 2019-09-10 | 中石化石油工程技术服务有限公司 | A kind of shale gas horizontal well is pumped by bridging device |
| CN110219610B (en) * | 2019-06-20 | 2024-02-13 | 中国石油化工集团有限公司 | Shale gas horizontal well high-pressure pumping bridge plug device |
| CN112177583A (en) * | 2019-07-01 | 2021-01-05 | 中国石油化工股份有限公司 | Close cutting fracturing method |
| CN112177583B (en) * | 2019-07-01 | 2022-07-05 | 中国石油化工股份有限公司 | Close cutting fracturing method |
| CN111021977A (en) * | 2019-11-22 | 2020-04-17 | 中国石油天然气股份有限公司 | Method for quickly removing soluble bridge plug in case of blocking |
| CN111021977B (en) * | 2019-11-22 | 2022-05-10 | 中国石油天然气股份有限公司 | Method for quickly removing soluble bridge plug in case of blocking |
| CN110714746A (en) * | 2019-11-28 | 2020-01-21 | 中国华能集团清洁能源技术研究院有限公司 | Sawtooth-shaped fracturing device and method for geothermal system |
| CN110714746B (en) * | 2019-11-28 | 2021-08-17 | 中国华能集团清洁能源技术研究院有限公司 | Sawtooth-shaped fracturing device and method for geothermal system |
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