CN100485160C - Nitrogen foam adjusting-actuating segment plug injection technique - Google Patents
Nitrogen foam adjusting-actuating segment plug injection technique Download PDFInfo
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- CN100485160C CN100485160C CNB200610150146XA CN200610150146A CN100485160C CN 100485160 C CN100485160 C CN 100485160C CN B200610150146X A CNB200610150146X A CN B200610150146XA CN 200610150146 A CN200610150146 A CN 200610150146A CN 100485160 C CN100485160 C CN 100485160C
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Abstract
The invention relates to a nitrogen foam profile slugging injecting process, which solves problems that in prior profile control and water shutoff process the low permeable position at the top of thick oil layer can not be developed in effect; when the deep profile control require larger radius there is obvious oil increase and water decrease effect and the cost is higher. It is characterized in that the slugging injecting method is adopted and there are different slugs with different sizes, different prescriptions and different injecting purposes. It is provided with small treatment radius and it can develop the low permeable position at the top of thick oil layer in effect. It can decrease water and increase oil obviously. The cost of invention is low.
Description
Technical field:
The present invention relates to down-hole, oil recovery field, oil field rock and creep into back obstruction technology, belong to a kind of nitrogen foam adjusting-actuating segment plug injection technique.
Background technology:
The oil field is about to enter ultra-high water cut stage through the waterflooding extraction of four more than ten years, and output totally is in depletion stage, and part block and series of strata enter the oil field development late stage, basic well pattern and once adjust the moisture up to more than 90% of well.Because reservoir heterogeneity, the long-term injecting water exploitation causes that to inject the invalid poor efficiency circulation of water serious day by day, the conventional adjustment measure control water effect variation gradually of taping the latent power, and production decline is accelerated.The foam blocking technology prevents water breakthrough to the high infiltration of reservoir plugging position, and it is obvious that the invalid poor efficiency ringing of water effect is injected in control.For the on-the-spot injection technology problem of foam blocking technology, the on-the-spot injection technology research of polytype has been carried out in each oil field, as: gas-liquid mixed water injection, gas-liquid such as replace at the research of on-the-spot injection technology.The mining site practice result shows: there are some problems in on-the-spot injection technologies such as gas-liquid replaces, gas-liquid mixed water injection: 1, injection pressure is high does not match with the equipment injectability, aqueous vapor replaces the practical problem that can't implement water filling metaideophone gas in the injection process triumphantly, make test not reach the optimum gas liquor ratio, influenced the foam blocking ability; 2, has channeling takes place during the gas-liquid mixed water injection easily.
Summary of the invention:
For solving the deficiency in the background technology, the purpose of this invention is to provide a kind of nitrogen foam adjusting-actuating segment plug injection technique, it is little that this technology has treatment radius, can develop the effect of the hyposmosis position and the less permeable layer position at thick oil pay top effectively, and the decreasing water cut and increasing oil effect obviously reaches the low advantage of cost.
Technical scheme of the present invention is: this nitrogen foam adjusting-actuating segment plug injection technique comprises the following steps:
First slug is a preliminary treatment absorption slug: inject liquid measure and account for 11.3% of total liquid measure;
Second slug is a high permeability zone shutoff slug: inject liquid measure and account for 21.7% of total liquid measure, the gas-liquid subsurface volume compares 3:2;
The 3rd slug is a displacement of reservoir oil shutoff slug: inject liquid measure and account for 46% of total liquid measure, the gas-liquid subsurface volume compares 2:1;
The 4th slug is to protect slug after the shutoff: inject liquid measure and account for 21% of total liquid measure, the gas-liquid subsurface volume compares 2:1.
The liquid of using in the first above-mentioned slug is that concentration is 0.15% high molecular anion type polycrylamide; The liquid that second slug is used is that 0.5% neopelex, concentration are that 0.07% high molecular anion type polycrylamide and surplus are that water is formed by concentration; The liquid of using in the 3rd slug is that concentration is 0.15% high molecular anion type polycrylamide; The liquid of using in the 4th slug is that 0.8% neopelex, concentration are that 0.15% high molecular anion type polycrylamide, concentration are that 0.3% thiocarbamide, concentration are that 2% calcium chloride, concentration are that 1% chromic acetate and surplus are that water is formed by concentration; High molecular anion type polycrylamide is that molecular weight is 1900～3,500 ten thousand; Gas is nitrogen.
The invention has the beneficial effects as follows: the present invention adopts technique scheme, on ground nitrogen is mixed with the foam solution for preparing, mixed gas-liquid produces foam in foam maker, foam is descending along down-hole string, injection well downhole flow regulator place at each interval, by the distributional effects of down-hole level pressure blanking plug, foam is injected in the different intervals by different volumes.The present invention divides four different slugs to inject respectively: preliminary treatment absorption slug destination layer adsorbs in advance, reduces the absorption of blowing agent, increases foamability; The superelevation infiltration duct of high permeability zone shutoff slug purpose reservoir plugging forms full-bodied wrap in the foam leading edge, prevents has channeling; Displacement of reservoir oil shutoff slug purpose is utilized the selective shut-off effect of foam to high tight formation, starts less permeable layer, utilizes the foam selective shut-off effect moisture to oil reservoir, the high aquifer of shutoff, the high oil-bearing layer of displacement utilizes the come-up effect of gas in the foam, displacement hyposmosis position; Protection slug purpose prevents the dilution of follow-up water filling to foam after the shutoff, forms full-bodied isolation strip at the foam rear portion.
The foam liquid that has used gas-liquid mixed in addition in the present invention is as plugging agent: 1, utilize the selection of foam to high osmosis and low oil saturation, effectively the high oil reservoir high permeability zone of shutoff washing degree; 2, dodecyl phenenyl sulfate can increase the stability of foam, prolongs the period of validity of shutoff, guarantees turning to of follow-up injection water, improves crude output; In the low place of oil saturation, utilize POLYACRYLAMIDE FLOODING, improve crude output; 3, utilize gaseous component in the foam, effectively develop the hyposmosis position that water drive is difficult to develop, improve crude output.
Description of drawings:
The 2-1-076 well injectivity profile contrast of Fig. 1 north;
Fig. 2 north 2-fourth 2-59 well group is produced performance graph.
The specific embodiment:
The invention will be further described below in conjunction with embodiment: the present invention mixes nitrogen on ground with the foam solution for preparing, mixed gas-liquid produces foam in foam maker, foam is descending along down-hole string, injection well downhole flow regulator place at each interval, distributional effects by down-hole level pressure blanking plug, foam is injected in the different intervals by different volumes
Embodiment 1, Bei2-2-076Jing finish the injection work of four slugs of P II6-9 on February 3rd, 1 2006 on December 29th, 2005.
Phase I is a preliminary treatment absorption slug (05.12.29-05.12.31):
Stage accumulative total is annotated concentration 0.15% polymer solution 260m
3, injection rate 3.61m
3/ h, well head pressure rises to 11.0MPa by 10.5MPa.
Second rank are high permeability zone shutoff slug (06.1.1-06.1.10):
The gas-liquid mixed water injection, accumulative total fluid injection body 500m in the stage
3, injection rate 2.08m
3/ h, gas injection 15 * 10
4Nm
3, injection rate 525Nm
3/ h, accumulative total gas liquid ratio 3:2, well head mixed water injection pressure rises to 12.8MPa by 11.0MPa.
Phase III is a displacement of reservoir oil shutoff slug (06.1.11-06.1.26):
The gas-liquid mixed water injection, accumulative total fluid injection body 1060m in the stage
3, injection rate 2.76m
3/ h, gas injection 42.4 * 10
4Nm
3, injection rate 1104Nm
3/ h, accumulative total gas liquid ratio 2:1, well head mixed water injection pressure rises to 15.8MPa by 12.8MPa.
The quadravalence section is to protect slug (06.1.27-06.2.3) after the shutoff:
The gas-liquid mixed water injection, accumulative total fluid injection body 480m in the stage
3, injection rate 2.5m
3/ h, gas injection 19.2 * 10
4Nm
3, injection rate 1000Nm
3/ h, accumulative total gas liquid ratio 2:1, mouthful mixed water injection pressure rises to 16.9MPa by 15.8MPa.
The liquid of using in the first above-mentioned slug is that concentration is 0.15% high molecular anion type polycrylamide; The liquid that second slug is used is that 0.5% neopelex, concentration are that 0.07% high molecular anion type polycrylamide and surplus are that water is formed by concentration; The liquid of using in the 3rd slug is that concentration is 0.15% high molecular anion type polycrylamide; The liquid of using in the 4th slug is that 0.8% neopelex, concentration are that 0.15% high molecular anion type polycrylamide, concentration are that 0.3% thiocarbamide, concentration are that 2% calcium chloride, concentration are that 1% chromic acetate and surplus are that water is formed by concentration; High molecular anion type polycrylamide is that molecular weight is 1900～3,500 ten thousand.
Measure effect: test back intake profile improves, and thick oil pay top producing status improves, and the hyposmosis water sucting thickness increases.Bei2-1-076Jing with press (8.1MPa-8.2MPa) down the isotope injection profile test show, in the II6-9 of the Portugal interval of height infiltration, high infiltration (0.80 μ m
2) the position relative injectivity drops to 23.47% by 56.89%, hyposmosis (0.36 μ m
2) the position relative injectivity rises to 32.92% by 27.08%, illustrates that the displacement effect at thick oil pay top strengthens.Bei2-1-076Jing test back starting pressure increases 0.5MPa, and permeability is less than 100 * 10
-3μ m
2High I2-8 interval increase water sucting thickness 6m, relative injectivity rises to 43.61% by 4.17%, has increased by 39 percentage points of (see figure 1)s.
After measure takes effect, be communicated with oilwell produced fluid amount and descend, produce oil rises, moisture decline.The production fluid amount is by the 760m in January, 06
3/ d drops to the 685m in April
3/ d, oil production rises to 53.9t/d by 40.9t/d, and moisture decline drops to 92.13% by 94.62%.Up to the present, measure is remained valid, and is communicated with oil well in by the end of August, 2006 and totally increases oily 3663t (see figure 2).
The nitrogen foaming agent of carrying out at the water drive block improves the individual well of recovery ratio and the field trial of well group, and all obtained the injection well profile and improved, the significant good effect of corresponding oil well oil increasing precipitation, and obtained good economic benefit, input-output ratio is more than 1:3.
Claims (3)
1, a kind of nitrogen foam adjusting-actuating segment plug injection technique, it is characterized in that: comprise the following steps: at first nitrogen to be mixed with the injection liquid for preparing on ground, mixed gas-liquid produces foam in foam maker, first slug is nitrogen injection not, and the situation of specifically injecting is as follows:
First slug is a preliminary treatment absorption slug: inject liquid measure and account for 11.3% of total liquid measure;
Second slug is a high permeability zone shutoff slug: inject liquid measure and account for 21.7% of total liquid measure, the gas-liquid subsurface volume compares 3:2;
The 3rd slug is a displacement of reservoir oil shutoff slug: inject liquid measure and account for 46% of total liquid measure, the gas-liquid subsurface volume compares 2:1;
The 4th slug is to protect slug after the shutoff: inject liquid measure and account for 21% of total liquid measure, the gas-liquid subsurface volume compares 2:1;
The liquid of using in the first above-mentioned slug is that concentration is 0.15% high molecular anion type polycrylamide; The liquid that second slug is used is that 0.5% neopelex, concentration are that 0.07% high molecular anion type polycrylamide and surplus are that water is formed by concentration; The liquid of using in the 3rd slug is that concentration is 0.15% high molecular anion type polycrylamide; The liquid of using in the 4th slug is that 0.8% neopelex, concentration are that 0.15% high molecular anion type polycrylamide, concentration are that 0.3% thiocarbamide, concentration are that 2% calcium chloride, concentration are that 1% chromic acetate and surplus are that water is formed by concentration.
2, nitrogen foam adjusting-actuating segment plug injection technique according to claim 2 is characterized in that: high molecular anion type polycrylamide is that molecular weight is 1900～3,500 ten thousand.
3, nitrogen foam adjusting-actuating segment plug injection technique according to claim 1 is characterized in that: gas is nitrogen.
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| CN100485160C true CN100485160C (en) | 2009-05-06 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102052067B (en) * | 2010-10-16 | 2013-10-23 | 中国石油大学(华东) | In-depth profile control step by step method employing equipressure drop gradient |
| CN102140338B (en) * | 2011-01-04 | 2013-05-29 | 中国石油大学(华东) | Fluorocarbon surfactant binary composite foam flooding system |
| CN102828733B (en) * | 2012-09-04 | 2015-06-03 | 北京科技大学 | Method for extracting residual crude oil in oil field by using foam compound system |
| CN104100224B (en) * | 2013-04-03 | 2016-12-28 | 中国石油天然气股份有限公司 | A kind of oilwell water shutoff method |
| CN103666422A (en) * | 2013-12-04 | 2014-03-26 | 天津大港油田滨港集团博弘石油化工有限公司 | High-strength dilatation-retarding particle deep fluid diverting agent |
| CN104806195B (en) * | 2015-03-14 | 2017-07-28 | 肖传敏 | A kind of alternative effect thickening thin oil transfer drive method and system |
| CN108203579B (en) * | 2016-12-20 | 2020-03-10 | 中国石油天然气股份有限公司 | Nitrogen foam gel plugging agent and preparation method and application thereof |
| CN109057746B (en) * | 2018-08-01 | 2020-07-10 | 中国石油天然气股份有限公司 | Water plugging method for screen pipe horizontal well |
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Non-Patent Citations (6)
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| 氮气泡沫驱注入参数优化研究. 邓玉珍，刘慧卿，王增林，李秀生.中国石油大学胜利学院学报，第20卷第1期. 2006 |
| 氮气泡沫驱注入参数优化研究. 邓玉珍，刘慧卿，王增林，李秀生.中国石油大学胜利学院学报，第20卷第1期. 2006 * |
| 注氮气泡沫提高采收率技术在胜利油田的应用. 施德友，杨景利，严新新，张斌，谷凯.天然气勘探与开发，第28卷第2期. 2005 |
| 注氮气泡沫提高采收率技术在胜利油田的应用. 施德友，杨景利，严新新，张斌，谷凯.天然气勘探与开发，第28卷第2期. 2005 * |
| 高含水后期厚油层注氮气泡沫控水增油技术研究. 王波，王鑫，刘向斌，李胜龙.大庆石油地质与开发，第25卷第2期. 2006 |
| 高含水后期厚油层注氮气泡沫控水增油技术研究. 王波，王鑫，刘向斌，李胜龙.大庆石油地质与开发，第25卷第2期. 2006 * |
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