CN1375615A - Method of regulating water sucking sectino of deep oil layer - Google Patents
Method of regulating water sucking sectino of deep oil layer Download PDFInfo
- Publication number
- CN1375615A CN1375615A CN 02116422 CN02116422A CN1375615A CN 1375615 A CN1375615 A CN 1375615A CN 02116422 CN02116422 CN 02116422 CN 02116422 A CN02116422 A CN 02116422A CN 1375615 A CN1375615 A CN 1375615A
- Authority
- CN
- China
- Prior art keywords
- polymer
- water
- dispersion
- cross
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The water injection profile regulation method for further raising crude recovery efficiency is characterized by that in the course of injecting crosslinked polymer solution into water injection well the described crosslinked polymer solution is a dispersion system which is formed from cross-linking agent solution and polymer solution in water and has elastic solid and/or non-solid particles or a dispersion system formed from polymer coil made up by cross-linking cross-linking agent solution and polymer solution, and the diameter of elastic solid and/or non-solid particles or cross-linked polymer coil in the dispersion system is 10-2000 nm, and the viscosity of said dispersion system is 0.6-8.9 mPa.s.
Description
Invention field
The present invention relates to field of petroleum exploitation, relate to a kind of adjustment that realizes the oil deposit deep part intake profile in oil field specifically, make in water drive or polymer flooding process and can not displaced, further improve the method for oil recovery factor by the crude oil of extraction.
Background of invention
In oil recovery process, the displacement of reservoir oil is an important step that improves oil recovery factor, and traditional method comprises the water drive oil and the chemical displacement of reservoir oil.Take a broad view of traditional oil displacement process, can find, because formation heterogeneity, the effect of this flooding method is, the crude oil in the higher rock stratum of permeability can successfully be displaced, and the crude oil in the low rock stratum of permeability is still stayed underground.For the oil field of long-term employing waterflooding extraction, because the water flushing, clay runs off, and the permeability on higher permeability stratum further improves, and injection water is often flowed along high permeability zone, and involves the less permeable layer less than oil-containing.The water filling of this poor efficiency not only influences the crude oil recovery percent of reserves, and owing to the consumption of the energy, the processing of output liquid, the corrosion of pipeline etc. have increased the cost that recovers the oil.
In order to address the above problem, the technician adjusts the intake profile technology to the deep of oil reservoir for many years and has carried out a large amount of research and exploration.Except that adopting mechanical means, before the sixties, adopt cement paste as water plugging profile control agent, oil base cement, milk of lime, resin, active viscous crude etc. have then been developed, how based on resin, entering the seventies water-soluble polymer gel begins to use in the oil field, the use of polymer gel (polymer concentration is at 3000-6000mg/L) has been played certain effect to improving oil production rate, but limited to the recovery ratio effect that improves water-drive pool.Also find in practice, these The Application of Technology only can produce corrective action with interior oil reservoir section to 15 meters of distance water injection wells generally speaking, crucial difficult point in the profile control technique, that is oil reservoir deep profile controlling (the intake profile adjustment of oil reservoir beyond 15 meters of the water injection wells) and involve section greatly and adjust still not solution of problem.
Since the nineties,, caused new problem along with applying of polymer displacement of reservoir oil tech, that is, the non-homogeneity of oil reservoir aggravation behind the polymer flooding, the water breakthrough problem is more outstanding.How further to enlarge the section that involves of oil reservoir displacing fluid behind the polymer flooding, further increase substantially oil recovery factor, become another new urgency problem to be solved.
Each period, the adjustment to the oil deposit deep part intake profile all was to finish by injecting profile control agent, in the injection process of profile control agent, traditional method comprises: 1, the profile control agent that will prepare in advance injects from water injection well, because traditional profile control agent is pursued high viscosity or high strength (as polymer gel), the polymer concentration that uses is higher and form net structure, cause injection pressure higher, inject difficulty; 2, adopt " two-fluid process " to inject, the method is earlier from water injection well injection of polymer solution, (generally being several days) injects crosslinking agent from same water injection well more after a period of time, wish that polymer and crosslinking agent meet and take place crosslinked at earth formation deep, play the effect of deep profile controlling, but because the absorption loss of crosslinking agent in the stratum, diffusion waits the influence of factor slowly in polymer solution, polymer and crosslinking agent are difficult to form gel in the stratum, so do not have the effect of the deep profile controlling of anticipation; 3, adopt " delay cross linking method ", the method is crosslinking agent to be wrapped in " capsule ", capsule is mixed in the polymer solution, behind the mixed liquor injection stratum with capsule and polymer solution, capsule breaks gradually, discharge crosslinking agent, make it to form polymer gel, play the effect of deep profile controlling with crosslinked polymer.But because the preparation of capsule and rupture time are difficult to control, the method does not also have the record of achieving success in field test.
Summary of the invention
Deficiency at present technology of reservoir sweep, the invention provides a kind of new oil reservoir deep profile controlling method, the formation of the profile modification system that the method utilization is new reach enlarge water drive and Polymer Flooding Reservoirs deep involve the section adjustment, reduce the moisture content of producing well, improve the purpose of oil recovery factor.
Method according to adjustment oil reservoir of the present invention deep intake profile, comprise the process of in water injection well, injecting cross-linked polymer solution, wherein, described cross-linked polymer solution is the dispersion with elastic solid (Hookean body) and/or non-solid particulate that formed in water by cross-linking agent solution and polymer solution or by cross-linking agent solution and the crosslinked dispersion of polymer coil in water of polymer solution, elastic solid (Hookean body) in this dispersion and/or non-solid particulate or crosslinked polymer coil diameter are at 10-2000nm, and the viscosity of this dispersion is 0.6-8.9mPa.s.
Dispersion advantage used in the present invention is injected cross-linking agent solution and polymer solution, is made it to form at pipeline and stratum flow process by on-the-spot on-line mixing mode.Adopt single-fluid process from water injection well injection of polymer solution and cross-linking agent solution in the practical operation, in injection process, cross-linking agent solution is scattered in injects water, making polymer solution mix the back with this dispersion again injects also, inject water and can adopt clear water or sewage, in formed dispersion, metal crosslinked ratio by quality ratio is 5-100 among the concentration 50-1000mg/L of polymer, polymer and crosslinking agent.
The method according to this invention, polymer and the crosslinking agent material selected should be able to make it be mixed into the profile control agent dispersion with elastic solid (Hookean body) and/or non-solid particulate or linked polymer coil, especially diameter is at the dispersion of 10-2000nm, its viscosity is at 0.6-8.9mPa.s, because this dispersion has special stability characteristic (quality) and good flow behavior.The present invention uses this profile modification system to realize deep profile controlling, its mechanism is to utilize formed cross-linked polymer elastic solid (Hookean body) and/or non-solid particulate or crosslinked absorption, the delay of polymer coil in the pore throat of stratum, from microcosmic to macroscopic view, from the close-by examples to those far off reduce the permeability of high permeability formation gradually, promote displacing fluid to change flow direction, at the section that involves of earth formation deep adjustment, expansion displacing fluid.
So, the use of this profile modification system and generation type are one of key problem in technology of the present invention, it should be the material that can form this profile modification system that the present invention requires crosslinking agent and polymer selected and that use, and available crosslinking agent material can be selected from: aluminium citrate, chromic acetate and organic zirconium; Available polymer comprises: the partially hydrolyzed polyacrylamide (PHPA) of molecular weight 100-3000 ten thousand (HPAM), degree of hydrolysis is generally 10-30%.For example, can select aluminium citrate (AlCit) as crosslinking agent, polymer is then selected partly hydrolyzed polyacrylamide (HPAM) for use, and its molecular weight is at 100-3000 ten thousand, 10-30% degree of hydrolysis, their all commercially available arriving.
Profile modification system used in the present invention is crosslinking agent to be well-dispersed in earlier inject water, then is mixing in the water filling main line with polymer again under the condition of the certain crosslinked ratio of control and then in common inflow stratum and form, thereby can reach oil deposit deep part smoothly, this is another key point that realizes the object of the invention.
According to depth profile control method of the present invention, the cross-linking agent solution concentration that is used for on-the-spot preparation can be 20-100%, polymer solution concentration can be 2000-10000mg/L, polymer concentration is 50-1000mg/L in the profile modification system through mix forming, and the crosslinked of metal is injected into water injection well than (by quality ratio) for the dispersion of 5-100 in polymer and the crosslinking agent.General requirements mixed process is carried out under 10-90 ℃ of temperature, and the pH that injects water is at 4-9.
Technique effect of the present invention is: compare with the employed profile control agent of traditional profile control technique, polymer concentration used in the present invention is significantly reduced, and helps obtaining having elastic solid (Hookean body) and/or non-solid particulate or the crosslinked dispersion of polymer coil in water.Because viscosity is lower, help entering the tens of rice of oil deposit deep part to hundreds of meters through higher permeability formation (aquaporin that water drive or polymer flooding form).Since these flexible solids and/or non-solid particulate or crosslinked polymer coil can be in earth bore be shouted absorption, delay, therefore can be from microcosmic to macroscopic view, from the close-by examples to those far off reduce the permeability of high permeability formation gradually, promote follow-up displacing fluid to change flow direction, to come out than the mother oil displacement that water drive in the tight formation (microcosmic or macroscopic view) or polymer flooding fail to displace, reach and enlarge the involve section of displacing fluid at earth formation deep, reduce the moisture content of producing well, improve the purpose of oil recovery factor.
Further specify the remarkable result that the inventive method has below in conjunction with specific embodiment.
Description of drawings
Fig. 1 is that intake profile method flow schematic diagram is adjusted in the deep of oil reservoir of the present invention.
Embodiment
Preparation of the scene of profile modification system and injection process can be with reference to the flow processs of accompanying drawing 1:
At first with the aluminum citrate solution (crosslinking agent) of 20-100% being pumped into the water filling main line, and inject water (clear water or the sewage) blender of together flowing through, crosslinking agent is fully disperseed; With degree of hydrolysis 10-30%, molecular weight is that polyacrylamide (polymer) solution of 100-3000 ten thousand is imported the water filling main line with pump, control polymer concentration and crosslinked ratio, mixed preparing becomes the profile control agent dispersion that the present invention is used for profile control, and this profile control agent is injected water injection well (above method is alleged single-fluid process method for implanting).
10-90 ℃ of the temperature control of mixed process, the pH4-9 of injection water.Field test one:
The test well group comprises 1 mouthful of water injection well, and 4 mouthfuls of producing wells are water-drive oil recovery before the test.Injecting the profile modification system polymer concentration is 160-250mg/L, and crosslinked ratio 20: 1 is prepared with clear water.In 3 months duration of test, response producer is moisture reduces to 75%, day crude output increase by 40% by 85%.The profile control scope of this profile control agent is about more than 60 meters apart from water injection well as calculated.Field test two:
The test well group comprises 1 mouthful of water injection well, and 5 mouthfuls of producing wells are water-drive oil recovery before the test.Injecting the profile modification system polymer concentration is 200mg/L, and crosslinked ratio 10: 1 is prepared with sewage.In 10 months duration of test, test well group (producing well) is moisture reduces to 63% by 81%, has descended 18 percentage points, and average daily oil production rises to 22 tons for preceding 10.6 tons by test, and increasing oily amplitude is 107%.The profile control scope of this profile modification system is about more than 80 meters apart from water injection well as calculated.Field test three:
The test block comprises 4 mouthfuls of water injection wells, and 11 mouthfuls of producing wells have experienced water drive-polymer flooding-water-drive oil recovery before the test.Before on-test, the polymer flooding effect disappears, moisture fast rise significantly.Polymer concentration is 200-400mg/L in the preparation profile modification system, crosslinked ratio 20: 1-10: 1, and 7 months of on-test with the clear water preparation, and back 6 months with the sewage preparation, 13 months injecting profile control agent solution 0.1Pv (voids volume) altogether.
At duration of test, injection well injection pressure average oil presses and rises 2.5MPa, high permeability zone generation shutoff, and interlayer contradiction is effectively improved, and obvious change has taken place in the flow direction in the plane that inject water, and the profile control scope of profile control agent is about more than 100 meters apart from water injection well; The state that kept decline or fluctuation in the continuous 14-19 of moisture content month of test block, centerwell, moisture zooming trend is effectively controlled; The oil production rebound significantly meets or exceeds the level before on-test when the highest, obtain tangible oil increasing effect.After begin 20 months, this deep profile controlling effect is compared with water drive, improves recovery percent of reserves 1.5%, increases by 2.47 ten thousand tons of oil production, increases oily amplitude 38%, and input-output ratio is 1: 11.
Claims (6)
1, adjusts the method for oil reservoir deep intake profile, comprise in water injection well and to inject the dispersion that is cross-linked to form at water by cross-linking agent solution and polymer solution or by the dispersion of the crosslinked polymer coil of cross-linking agent solution and polymer solution at water with elastic solid (Hookean body) and/or non-solid particulate, elastic solid (Hookean body) in this dispersion and/or non-solid particulate or crosslinked polymer coil diameter are at 10-2000nm, and the viscosity of this dispersion is 0.6-8.9mPa.s.
2, the described method of claim 1, wherein, described dispersion is to inject cross-linking agent solution and polymer solution by on-the-spot on-line mixing mode, makes it the profile control agent dispersion that forms in pipeline and stratum flow process.
3, claim 1 or 2 described methods wherein, are scattered in cross-linking agent solution earlier and inject water, polymer solution are mixed being injected into water injection well again with this injection water.
4, the described method of claim 3 wherein, hands over glue crosslinking agent to be selected from aluminium citrate, chromic acetate, organic zirconium; Polymer is the partially hydrolyzed polyacrylamide (PHPA) of molecular weight 100-3000 ten thousand.
5, claim 1 or 2 described methods, wherein, in formed dispersion, metal crosslinked ratio by quality ratio is 5-100 among the concentration 50-1000mg/L of polymer, polymer and crosslinking agent.
6, claim 1 or 2 described methods, wherein, the cross-linking agent solution concentration of using is 20-100%, polymer solution concentration is 2000-10000mg/L, and metal crosslinked ratio by quality ratio is 5-100 in polymer and the crosslinking agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02116422 CN1231653C (en) | 2002-04-03 | 2002-04-03 | Method of regulating water sucking sectino of deep oil layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02116422 CN1231653C (en) | 2002-04-03 | 2002-04-03 | Method of regulating water sucking sectino of deep oil layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1375615A true CN1375615A (en) | 2002-10-23 |
| CN1231653C CN1231653C (en) | 2005-12-14 |
Family
ID=4744100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02116422 Expired - Fee Related CN1231653C (en) | 2002-04-03 | 2002-04-03 | Method of regulating water sucking sectino of deep oil layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1231653C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300180C (en) * | 2004-02-26 | 2007-02-14 | 石油大学(北京) | Preparation process of cross-linked polymer clew |
| CN101240044B (en) * | 2007-02-07 | 2010-10-06 | 中国石油大学(北京) | Method for preparing cross-linking polymer clew with bimodal distribution grain diameter |
| CN102817601A (en) * | 2012-08-31 | 2012-12-12 | 中国石油天然气股份有限公司 | Method and device for polymer flooding oilfield on-line profile control by using cross-linking agent |
| CN102817602A (en) * | 2012-08-31 | 2012-12-12 | 中国石油天然气股份有限公司 | Online profile control method and device for polymer flooding oil field |
| CN107227149A (en) * | 2016-03-24 | 2017-10-03 | 中国石油化工股份有限公司 | A kind of LOW PERMEABILITY RESERVOIR water injection well profile control agent and preparation method thereof |
| CN109181663A (en) * | 2018-09-11 | 2019-01-11 | 山东石大油田技术服务股份有限公司 | A kind of polymer paste |
| CN109209322A (en) * | 2018-09-05 | 2019-01-15 | 大庆油田有限责任公司 | A kind of polymer automation feed liquid method meeting high discharge capacity pressure break injection demand |
-
2002
- 2002-04-03 CN CN 02116422 patent/CN1231653C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300180C (en) * | 2004-02-26 | 2007-02-14 | 石油大学(北京) | Preparation process of cross-linked polymer clew |
| CN101240044B (en) * | 2007-02-07 | 2010-10-06 | 中国石油大学(北京) | Method for preparing cross-linking polymer clew with bimodal distribution grain diameter |
| CN102817601A (en) * | 2012-08-31 | 2012-12-12 | 中国石油天然气股份有限公司 | Method and device for polymer flooding oilfield on-line profile control by using cross-linking agent |
| CN102817602A (en) * | 2012-08-31 | 2012-12-12 | 中国石油天然气股份有限公司 | Online profile control method and device for polymer flooding oil field |
| CN102817602B (en) * | 2012-08-31 | 2015-01-21 | 中国石油天然气股份有限公司 | online profile control method and device for polymer flooding oil field |
| CN102817601B (en) * | 2012-08-31 | 2015-04-08 | 中国石油天然气股份有限公司 | Method and device for polymer flooding oilfield on-line profile control by using cross-linking agent |
| CN107227149A (en) * | 2016-03-24 | 2017-10-03 | 中国石油化工股份有限公司 | A kind of LOW PERMEABILITY RESERVOIR water injection well profile control agent and preparation method thereof |
| CN107227149B (en) * | 2016-03-24 | 2020-04-07 | 中国石油化工股份有限公司 | Low-permeability reservoir water injection well profile control and flooding agent and preparation method thereof |
| CN109209322A (en) * | 2018-09-05 | 2019-01-15 | 大庆油田有限责任公司 | A kind of polymer automation feed liquid method meeting high discharge capacity pressure break injection demand |
| CN109181663A (en) * | 2018-09-11 | 2019-01-11 | 山东石大油田技术服务股份有限公司 | A kind of polymer paste |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1231653C (en) | 2005-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104975829B (en) | A kind of CO2 oil reservoirs recovery methods of grading control mobility | |
| CN102251763B (en) | Composite profile control and flooding oil production method for developing heavy oil reservoir by water injection | |
| CN106246150A (en) | Oil field fracturing transformation method | |
| CN101158280A (en) | Oil well high water-bearing layer pressure blocking method | |
| CN101086210A (en) | Profile control and water plugging technology for coal bed gas | |
| CN106703775B (en) | Coal bed gas fracturing method | |
| CN1831294A (en) | Nitrogen filling foam water-control oil-increasing technology | |
| CN102562012A (en) | Method for improving recovery ratio of water-flooding developed common heavy oil reservoir | |
| CN1231653C (en) | Method of regulating water sucking sectino of deep oil layer | |
| CN108708697B (en) | Particle size matching method for low-permeability reservoir polymer microspheres | |
| CN101915079A (en) | Integrated de-plugging yield increasing process | |
| CN104342094B (en) | Fly ash composite gel liquid flow diverter as well as preparation and application thereof | |
| CN100489053C (en) | Macropore plugging gelatin | |
| CN110118079B (en) | Fracturing exploitation method for high-wax-content oil layer | |
| CN110344803B (en) | Water-control fracturing yield-increasing method for rock debris sandstone bottom water-gas layer | |
| CN111322052A (en) | Method for injecting oil displacement agent and plugging agent into thick oil layer by fracturing to drive and wash low-water-content part and plug strong-water-washing strip | |
| Tang et al. | Adaptability and enhanced oil recovery performance of surfactant–polymer flooding in inverted seven-spot well pattern | |
| CN104178100A (en) | Multielement profile control system suitable for water flooding exploitation oil fields and profile control technology | |
| CN101747879B (en) | Baffle for thin layer oilfield controlling coning of bottom water and injection method thereof | |
| CN114907826B (en) | Targeting deep profile control agent and preparation method and application thereof | |
| CN101403290A (en) | Method for improving extraction rate of ultra-thick oil | |
| CN1182182C (en) | Preparation of deep modifier for cross-linked polymer solution (LPS) | |
| Yuan et al. | Optimization of temporary plugging parameters under rough fractures | |
| CN1594493A (en) | Submicron polymer active microsphere profile-control oil-displacement agent | |
| CN115746808A (en) | Plugging agent and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051214 |