CN101705811A - Chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well - Google Patents
Chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well Download PDFInfo
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- CN101705811A CN101705811A CN200910024276A CN200910024276A CN101705811A CN 101705811 A CN101705811 A CN 101705811A CN 200910024276 A CN200910024276 A CN 200910024276A CN 200910024276 A CN200910024276 A CN 200910024276A CN 101705811 A CN101705811 A CN 101705811A
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Abstract
The invention relates to a petroleum extraction technology, aiming at a strong sensitivity oil layer water injection well. In the technology, chemical injection agent is prepared by the four components in parts by weight: 10-25% of acid, 3-15% of alkali, 0.3-8.5% of surfactant, 1-7% of oxidant, and the balance water. When in use, an on-site injection manner of segmented plug continuous injection is adopted, the injection pressure is lower than petroleum layer fracture pressure, and the injection speed is controlled to be 150-300L/min based on the output volume. The invention integrates the technical principals of various oil layer plugging relief and oil displacement technologies of acid, alkali, surface active agent, oxidant, autogenous CO2 and the like to generate technical addictive effect, thereby realizing to solve the technical problems of comprehensive chemical plugging relief and pressure decreasing and augmented injection of the strong sensitivity oil layer water injection well.
Description
Technical field
The present invention relates to a kind of oil exploitation technology, specifically, is the oil exploitation technology at strong responsive oil reservoir injection well.
Background technology
In the oil exploitation process, reservoir is produced the sensitiveness infringement because outside fluid enters that the stratum causes physics-chemical reaction.The sensitiveness of reservoir comprises: quick, the water-sensitive of speed, acid-sensitive, salt is quick, alkali is quick and stress sensitivity.Therefore, reservoir sensitiveness is the topmost factor of oil reservoir injury in the middle High Water Cut Reservoir exploitation.In oil-field flooding displacement of reservoir oil development process, owing to inject being incompatible of water and reservoir rock mineral, reservoir fluid, the existence of metabolism products such as oil-containing, suspension, microorganism in the water, and cause sensitiveness physics, the chemical modification of oil reservoir, the water injection well stratum is caused serious injury, cause water injection pressure to raise, injectivity index descends, and influences oil displacement efficiency.
Chemical intensified injection measures such as the more hydrochloric acid of present domestic employing, mud acid, potential acid, acidifying-oxidation, heat chemistry augmented injection, even use other technical method such as pressure break, but all can't fundamentally solve the technical barrier of reservoir sensitiveness.
Summary of the invention
The objective of the invention is to, particularity at the strong responsive oil reservoir of extra permeability oilfield (being that multiple sensitivity exists simultaneously), the oil field that solves that multiple sensitiveness exists simultaneously or exist respectively is in the waterflooding extraction process, the water injection pressure height that water injection well causes because of various contamination and plugging, injury oil reservoir or other factors, technical barriers such as water filling difficulty provide a kind of chemical antihypertensive increase water injection technology at strong sensitivity oil-bearing stratum flooding well.
The present invention is achieved in that and adopts acid, alkali, surfactant, four kinds of components of oxidant and water to be mixed with chemical injecting, the weight portion ratio of four kinds of components is: acid 10～25%, alkali 3～15%, sulfonate surfactant 0.2～5%, fluorine carbon surfactant 0.1～3.5%, oxidant 1～7%, water surplus.
Acid-be meant with inorganic acid and organic acid mix acid liquor;
Alkali-be meant with inorganic base solution such as NaOH or sodium carbonate;
Surfactant-sulfonate surfactant: 0.2～5%, fluorine carbon surfactant: 0.1～3.5%;
Oxidant-be meant stable ClO 2 solution;
Water-the be meant qualified clear water that is used for the oil field compression fracture acidifying.
When the present invention uses, adopt on-the-spot injection mode: divide slug to inject continuously; Injection pressure: be lower than the oil reservoir fracture pressure; Injection rate: the control discharge capacity is at 150-300L/min.Under well head, the specified safe pressure condition of pipeline, adjustable big injection discharge capacity improves the blockages relieving fluid penetration range, the deep de-plugging.
Generate the microemulsion fluid that can solve how responsive low-permeability oil deposit during the said components preparation, improve formation fluid and ooze relation mutually; Produce exothermic reaction, can improve the temperature of environment, help the enforcement of de-plugging step-down increase water injection technology and improve its validity; Produce CO simultaneously
2((be meant alkali matter component and the acid constituents stratum generation chemical reaction that meets, generate a large amount of CO
2), form postcritical CO
2Microemulsion.
The present invention has gathered acid, alkali, heat, surfactant, oxidant and spontaneous CO
2Etc. multiple oil layer unblocking, technology of reservoir sweep principle, the generating technique synergistic effect realizes solving the technical barrier of strong responsive oil-bearing stratum flooding well chemistry integrative blockage relieving and step-down augmented injection.
The specific embodiment
Three embodiment of narration are described further with regard to the present invention below.
The scene is lower than the oil reservoir fracture pressure, divides slug to inject continuously; Injection rate, control discharge capacity are at 150-300L/min.
Embodiment 1
Long Qingan County plug oil field G14-22 well, long 10 oil reservoirs exist that highly basic is quick, Qiang Sumin, strong acid is quick, moderate salt is quick and multiple sensitiveness such as moderate stress sensitive.
Adopt acid, alkali, surfactant, oxidant to be mixed with chemical injecting, the weight portion ratio of several components is: acid 10, and alkali 15%, with Sulfonates 0.2%, fluorine carbon 3.5%, oxidant 1%, water surplus.
On June 20 2009 measure date, the water filling data are before the measure: oil pressure 10.3Mpa, casing pressure 10Mpa, injection allocation 25m
3, the real 5m that annotates
3
The water filling data are after the measure: oil pressure 8.0Mpa, casing pressure 7.9Mpa, injection allocation 30m
3, the real 30m that annotates
3The augmented injection effect is obvious, and has reduced water injection pressure, reaches the injection allocation requirement.
This well construction process is continuous, stake in time after the measure.Adopting low concentration acid solution and low discharge capacity to inject (130-200L/min), to have alleviated strong acid quick and fast quick etc., less to formation damage.
Embodiment 2 long celebrating Ji plateau oil field Y69-38 wells, there are quick, the multiple sensitiveness such as alkali is quick, water-sensitive of speed in long 2 oil reservoirs.
Adopt acid, alkali, surfactant, oxidant to be mixed with chemical injecting, the weight portion ratio of several components is: acid 25%, alkali 3%, Sulfonates 5%, fluorine carbon 0.1%, oxidant 7%, water surplus.
Squeeze pressure reaches 18MPa during preliminary treatment, just squeezing preposition acid and main body treatment fluid I, II first when replacing, squeeze pressure is up to 15-16MPa, and existence more serious contamination and plugging near wellbore zone be described, and after preliminary treatment, tentatively seen plugging removal effect.
Effective after this well measure, alleviated water-sensitive, alkali is quick and fast sensitiveness such as quick to reservoir damage caused, water injection pressure declines to a great extent, water filling reaches 45m
3The injection allocation requirement of/d.Average day augmented injection 10m after the measure
3, present day augmented injection 1m
3, accumulative total augmented injection 2140m
3
Embodiment 3
The long plug water injection well in oil fields W25-07 of Qingan County well, long 6 oil reservoirs exist that speed is quick, acid-sensitive, salt is quick and multiple sensitiveness such as stress sensitive.
Adopt acid, alkali, surfactant, oxidant to be mixed with chemical injecting, the weight portion ratio of several components is: acid 15%, alkali 10%, Sulfonates 2.5%, fluorine carbon 1%, oxidant 4%, water surplus.
Condition of construction: water injection pressure height before the measure, injection allocation amount 20m
3/D, actual notes do not advance; After the measure, water injection pressure descends, and reaches geology injection allocation requirement.
2008-2009, this technology and product be in long Qingan County plug extra permeability oilfield, acid-sensitive at existing simultaneously, alkali is quick, salt is quick, speed is quick, certain special oil reservoir of stress sensitive test 10 surplus mouthful well, success rate 100% has solved the technical problem that perplexs oil field development.Obtain significant technological achievement and economic benefit.
Claims (7)
1. chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well, it is characterized in that: adopt acid, alkali, surfactant, oxidant to be mixed with chemical injecting, the weight portion ratio of four kinds of components is: acid 10～25%, alkali 3～15%, surfactant 0.3～8.5%, oxidant 1～7%, water surplus.
2. according to the described chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well of claim 1, it is characterized in that: said surfactant is Sulfonates 0.2～5%, fluorine carbon 0.1～3.5%.
3. according to the described chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well of claim 1, it is characterized in that: said acid is meant with inorganic acid and organic acid mix acid liquor.
4. according to the described chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well of claim 1, it is characterized in that: said alkali is meant with inorganic base solution such as NaOH or sodium carbonate.
5. according to the described chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well of claim 1, it is characterized in that: said oxidant is meant stable ClO 2 solution.
6. according to the described chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well of claim 1, it is characterized in that: said water is meant the qualified clear water that is used for the oil field compression fracture acidifying.
7. according to the method for the described strong sensitivity oil-bearing stratum flooding of claim 1 well chemical antihypertensive augmented injection, it is characterized in that: adopt on-the-spot injection mode: be lower than the oil reservoir fracture pressure and divide slug to inject continuously; Injection rate control discharge capacity is at 150-300L/min.
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| CN200910024276A CN101705811A (en) | 2009-10-12 | 2009-10-12 | Chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well |
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|---|---|---|---|
| CN200910024276A CN101705811A (en) | 2009-10-12 | 2009-10-12 | Chemical pressure decreasing and augmented injection technology for strong sensitivity oil layer water injection well |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141501A (en) * | 2010-12-22 | 2011-08-03 | 中国石油天然气股份有限公司 | Magnetic injection increase and depressurization test system |
| CN103059830A (en) * | 2013-01-09 | 2013-04-24 | 新疆华油技术服务股份有限公司 | Penetration agent for oil well, and preparation method as well as application thereof |
| CN103573285A (en) * | 2013-10-25 | 2014-02-12 | 山西潞安环保能源开发股份有限公司五阳煤矿 | Cylindrical mining method for three-low coal bed to extract coal bed methane |
| CN105863598A (en) * | 2016-06-27 | 2016-08-17 | 烟台智本知识产权运营管理有限公司 | Technology for increasing yield of low-permeability heavy oil well |
| CN105927200A (en) * | 2016-06-27 | 2016-09-07 | 烟台智本知识产权运营管理有限公司 | Method for increasing yield of low-permeability heavy oil well |
| CN106050209A (en) * | 2016-06-27 | 2016-10-26 | 烟台智本知识产权运营管理有限公司 | Method for improving yield of low-permeability heavy oil well |
-
2009
- 2009-10-12 CN CN200910024276A patent/CN101705811A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141501A (en) * | 2010-12-22 | 2011-08-03 | 中国石油天然气股份有限公司 | Magnetic injection increase and depressurization test system |
| CN102141501B (en) * | 2010-12-22 | 2012-10-03 | 中国石油天然气股份有限公司 | Magnetic injection increase and depressurization test system |
| CN103059830A (en) * | 2013-01-09 | 2013-04-24 | 新疆华油技术服务股份有限公司 | Penetration agent for oil well, and preparation method as well as application thereof |
| CN103573285A (en) * | 2013-10-25 | 2014-02-12 | 山西潞安环保能源开发股份有限公司五阳煤矿 | Cylindrical mining method for three-low coal bed to extract coal bed methane |
| CN105863598A (en) * | 2016-06-27 | 2016-08-17 | 烟台智本知识产权运营管理有限公司 | Technology for increasing yield of low-permeability heavy oil well |
| CN105927200A (en) * | 2016-06-27 | 2016-09-07 | 烟台智本知识产权运营管理有限公司 | Method for increasing yield of low-permeability heavy oil well |
| CN106050209A (en) * | 2016-06-27 | 2016-10-26 | 烟台智本知识产权运营管理有限公司 | Method for improving yield of low-permeability heavy oil well |
| CN105863598B (en) * | 2016-06-27 | 2018-04-17 | 烟台智本知识产权运营管理有限公司 | A kind of technique of hyposmosis heavy oil wells volume increase |
| CN105927200B (en) * | 2016-06-27 | 2018-06-12 | 烟台智本知识产权运营管理有限公司 | A kind of method of hyposmosis heavy oil wells volume increase |
| CN106050209B (en) * | 2016-06-27 | 2018-09-25 | 烟台智本知识产权运营管理有限公司 | A method of improving hyposmosis viscous crude well production |
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Application publication date: 20100512 |