CN102052067B - In-depth profile control step by step method employing equipressure drop gradient - Google Patents
In-depth profile control step by step method employing equipressure drop gradient Download PDFInfo
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- CN102052067B CN102052067B CN 201010515631 CN201010515631A CN102052067B CN 102052067 B CN102052067 B CN 102052067B CN 201010515631 CN201010515631 CN 201010515631 CN 201010515631 A CN201010515631 A CN 201010515631A CN 102052067 B CN102052067 B CN 102052067B
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Abstract
The invention provides an in-depth profile control step by step method employing equipressure drop gradient , which relates to the technical field of deep profile control of a water flooding development oil reservoir. According to the practical condition of a test block, suitable profile control agent is selected, and the breakthrough pressure gradients of profile control agents of different compositions are tested. A stratum is divided into a near wellbore zone, a far wellbore zone and a stratum deep according to the pressure drawdown of the stratum; and the pressure gradients of the zones are different, so that slugs with different strengths are required. According to the principle of equipressure drop gradient, namely, the breakthrough pressure gradient of the profile control agent equals to the pressure gradient of the stratum, the composition of each slug is selected, profile control slugs are combined, and the combined profile control slugs are optimized according to the cost. According to the invention, profile control agents with different strengths can be placed in different positions of the stratum, and overall in-depth fluid diverting step by step of the space of the oil reservoir can be realized through the combination of profile control agents with different strengths, so that the conformance factor can be improved greatly, further the oil recovery efficiency can be improved.
Description
Technical field:
The present invention relates to a kind of deep transfer drive technology, the method for a kind of step by step deep transfer drive of especially carrying out for pressure drop gradient principle such as waterflooding reservoir utilizations.
Technical background:
China is one of country that the waterflooding oil field ratio is higher in the world, and the waterflooding development reserves account for more than 60% of gross reserves.In the water drive process, because Reservoir Heterogeneity is serious, injected water is advanced unevenly along high permeability zone and high permeability zones, cause middle less permeable layer to involve degree low, oil displacement efficiency is poor, has had a strong impact on the development effectiveness of water drive and polymer flooding.To fundamentally address this problem, just must adopt the way of profile control and water plugging to improve intake profile, improve the water drive sweep efficiency.But the conventional profile control methods such as clay-polymer flocculation system, hydroexpanding body have its limitation, be mainly manifested in: after the repetition shutoff is repeatedly carried out in (1) near wellbore zone, oil saturation reduces greatly, needs especially Novel technique of in-depth profile control, oil reservoir is carried out the deep tap the latent power.(2) concerning thick oil pay, common profile control and water plugging can only cause near wellbore zone short-term fluid diversion, and oil reservoir deep injected water again streams and causes profile control valid expiration date greatly to shorten.In order to address these problems, carried out a large amount of laboratory tests and field trial, the result shows, solves crossflow and circumferential motion problem and must carry out the oil deposit deep part transfer drive.Further the further investigation result shows, the pressure field distribution from the nearly well of water injection well to the earth formation deep fluid has very large difference, and the effect that directly has influence on the displacement of reservoir oil causes underground saturation field also to present the step distribution.Therefore, for different parts preferably with the research and development profile control agent and the corresponding placement technique that are complementary with it, realize that deep flooding fluid turns to step by step, become a very promising developing direction, be to adapt to the current development phase, further excavate potentiality of remaining oil, improve the effective way of development effectiveness.
Summary of the invention:
The objective of the invention is to provide a kind of step by step deep transfer drive method of pressure drop gradient that waits, barometric gradient curve according to the stratum carries out step by step transfer drive level time division, utilization waits the pressure drop gradient principle, the profile control agent of varying strength is placed in different positions on the stratum, combination by the varying strength profile control agent make the oil reservoir space realize whole process step by step deep flooding fluid turn to, reach the purpose that increases substantially sweep efficiency.
Purpose of the present invention realizes like this: according to the actual formation conditional filtering profile control agent of test block, the screening principle is that profile control agent wants with low cost being easy to obtain, and stable performance under actual reservoir condition, strength retention ratio in 3 months is greater than 90%, and good injection efficiency is arranged, can enter earth formation deep.Measure the breakthrough pressure gradient of different formulations profile control agent by the single tube experimental model, draw the equivalent plate of breakthrough pressure gradient.The base area lamination falls curve and carries out step by step transfer drive level time division, divide the stratum by the tangent line of making the formation pressure gradient curve, tangent point is the separation of corresponding near wellbore zone, well area far away, earth formation deep then, and by two-tube physical simulation experiment, the non-homogeneity of simulated formation, by calculating input-output ratio, the best of optimization blocking agent is injected degree of depth r
oFoundation waits the pressure drop gradient principle, when namely the breakthrough pressure gradient of blocking agent equals formation pressure gradient, selects the profile control agent prescription of each slug at the equivalent plate top sieve of breakthrough pressure gradient, and the transfer drive slug is made up.Each slug combination is carried out costing, the slug combination that the optimization cost is minimum.
The invention has the beneficial effects as follows: combine closely with reservoir engineering, be based on the pressure field distribution between the oil-water well, different positions arranges the profile control agent of varying strength on the stratum according to waiting pressure drop gradient principle, profile control agent can be played a role in the rational position of oil reservoir, combination by the varying strength profile control agent makes the oil reservoir space realize that omnidistance deep flooding fluid turns to, and reaches the purpose that increases substantially recovery ratio.
Description of drawings:
Fig. 1 is that base area stressor layer gradient curve carries out the schematic diagram that near wellbore zone, well area far away and earth formation deep are divided.
Among the figure, 1.-first slug; 2.-second slug; 3.-the 3rd slug.
The specific embodiment:
Specify the present invention below in conjunction with embodiment.
Certain block has 2 mouthfuls of Injection Wells, 3 mouthfuls of producing wells, and 65 ℃ of reservoir temperatures, salinity 4165mg/L, well spacing is 100m.By screening, select multiple emulsion cross linker frozen glue as the deep profile control agent of this block, draw the frozen glue breakthrough pressure gradient isopleth map of different formulations.Experiment shows, the profile control agent consumption is 0.3V
P is high to be oozedThe time, input-output ratio is minimum, and the depth of stratum that enters by calculating is 55m.Divide near wellbore zone 3～8m by the barometric gradient curve, well area 8～20m far away, earth formation deep 20～55m.
In order to guarantee effectively shutoff stratum of profile control agent, select the barometric gradient of slug original position as the breakthrough pressure gradient of blocking agent, consider the impact of borehole, ground flow, well spacing composite factor, it is 3 times of required gel strength that the intensity that improves frozen glue makes it.The near wellbore zone breakthrough pressure gradient is 0.46MPam
-1, the breakthrough pressure gradient of required frozen glue is 1.4MPam
-1Well area far away breakthrough pressure gradient is 0.2MPam
-1, the breakthrough pressure gradient of required frozen glue is 0.6MPam
-1The earth formation deep breakthrough pressure gradient is 0.06MPam
-1, the breakthrough pressure gradient of required frozen glue is 0.2MPam
-1Can filter out a series of prescriptions from isopleth map, the optimization of transfer drive slug sees Table 1.
The optimization of table 1 transfer drive slug
(annotate: a represents emulsion polymer, and b represents emulsion cross linker)
In order to make frozen glue enter earth formation deep and more effective raising recovery ratio, avoid stopping up in the near wellbore zone, affect follow-up injection process, adopt first weak rear strong mode in the design of slug, every mouthful of transfer drive well day annotates and is 120m
3/ d, the online transfer drive well in 106 frozen glue deeps of stake inject the slug design and see Table 2.
Table 2 injects slug design (65 ℃ of well temperature)
Result of the test shows, injection well pressure obviously rises, the pressure 3.25MPa that on average raises.The altogether corresponding 3 mouthfuls of oil wells of two mouthfuls of transfer drive wells, 3 mouthfuls of oil wells all obviously take effect, and moisture content on average descends 3.04%, and the individual well oily 2.56t that on average increases day by day by in November, 08, has a net increase of 420 tons of oil.The WATER FLOODING CHARACTERISTIC CURVE prediction improves recovery ratio 0.482%, is valid up to 10 months, successful.
Claims (1)
1. one kind is waited step by step deep transfer drive method of pressure drop gradient, it is characterized in that, screen profile control agent according to the stratum physical condition, measure the breakthrough pressure gradient of profile control agent, be based on the pressure field distribution between the oil-water well, the base area lamination falls curve and carries out step by step transfer drive level time division, according to waiting pressure drop gradient principle, the profile control agent of varying strength is set by step, profile control agent can be played a role at the diverse location of oil reservoir, combination by the varying strength profile control agent realizes that omnidistance deep flooding fluid turns to, and reaches the purpose that increases substantially sweep efficiency, and concrete steps are as follows:
(1) principle of screening profile control agent: cost is relatively low, material is easily obtained, and stable performance under actual reservoir condition, strength retention ratio in 3 months is greater than 90%, and good injection efficiency is arranged, can enter earth formation deep, by screening, select multiple emulsion cross linker frozen glue as profile control agent;
(2) adopt the single tube physical simulation experiment, measure the breakthrough pressure gradient of profile control agent: 1. fill out sand tube vacuumizes saturation water, calculates voids volume; 2. time is solidifying after injecting the 1PV profile control agent; Pressure when 3. surveying water drive output the first drip fluid after the fill out sand tube shutoff, this conversion pressure is breakthrough pressure gradient to the pressure of 1m length rock core;
(3) prescription of change profile control agent is measured the breakthrough pressure gradient under the different formulations, draws the equivalent plate of breakthrough pressure gradient;
(4) the base area lamination falls curve and carries out step by step the transfer drive level and time divide: divide the stratum by the tangent line of making the stratum falloff curve, tangent point is the separation of corresponding near wellbore zone, well area far away, earth formation deep then, the profile control agent slug that each area is corresponding different, and by two-tube physical simulation experiment, the non-homogeneity of simulated formation, by calculating input-output ratio, the best of optimization profile control agent is injected degree of depth ro;
(5) in order to guarantee effectively shutoff stratum of profile control agent, select the barometric gradient of slug original position as the breakthrough pressure gradient of profile control agent, consider the impact of borehole, ground flow, well spacing composite factor, it is 3 times of required gel strength that the intensity that improves frozen glue makes it;
(6) slug combination that filters out is carried out costing, the slug combination that is combined as optimum that the optimization cost is minimum.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797442B (en) * | 2011-05-27 | 2015-05-20 | 中国石油化工股份有限公司 | Deep fluid diversion method |
| CN103643928B (en) * | 2013-11-21 | 2016-05-11 | 中国海洋石油总公司 | A kind of depth profile control method step by step based on pressure field and velocity field distribution |
| CN104060985B (en) * | 2014-06-16 | 2016-05-25 | 中国地质大学（北京） | A kind of stratified deposit profile control and water plugging blocking agent penetration depth method of testing and system |
| CN105443094B (en) * | 2014-07-31 | 2018-04-10 | 中国石油化工股份有限公司 | A kind of multichannel reservoir model of heavy crude heat extraction well to be onstructed and application |
| CN105443095B (en) * | 2014-07-31 | 2018-04-10 | 中国石油化工股份有限公司 | A kind of single channel reservoir model of heavy crude heat extraction well to be onstructed and application |
| CN108166960B (en) * | 2018-01-16 | 2020-08-07 | 中国石油天然气股份有限公司 | Low-permeability oil reservoir step-by-step profile control and flooding process |
| CN108825177B (en) * | 2018-07-09 | 2020-12-29 | 中国海洋石油集团有限公司 | Horizontal well profile control and flooding process |
| CN110529071A (en) * | 2019-08-09 | 2019-12-03 | 中国石油天然气股份有限公司 | Profile control method for blocking channeling cracks through combination of multiple sections of plugs |
| CN113175315A (en) * | 2021-05-27 | 2021-07-27 | 新疆正通石油天然气股份有限公司 | Fracturing process for improving fracturing yield increase effect |
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Address after: 266580 Changjiang Road West, Qingdao Development Zone, Shandong, China, 66 Applicant after: China Petroleum University (East China) Address before: 257061 North Dongying Road, Dongying, Shandong, No. two, No. 271 Applicant before: China Petroleum University (East China) |
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Inventor after: Dai Caili Inventor after: Zhao Guang Inventor after: You Qing Inventor after: Liu He Inventor after: Wang Lushan Inventor after: Zhao Juan Inventor after: Zhao Fulin Inventor after: Jin Yanxin Inventor after: Zhang Xinjun Inventor before: Dai Caili Inventor before: Wang Lushan Inventor before: Zhao Juan Inventor before: Zhao Fulin Inventor before: Jin Yanxin Inventor before: You Qing |
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Application publication date: 20110511 Assignee: Shandong Anjie Yu Petroleum Technology Service Co. Ltd. Assignor: China Petroleum University (East China) Contract record no.: 2019370000001 Denomination of invention: In-depth profile control step by step method employing equipressure drop gradient Granted publication date: 20131023 License type: Exclusive License Record date: 20190110 |
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