CN104088613A - Method for increasing fractured reservoir recovery ratio - Google Patents
Method for increasing fractured reservoir recovery ratio Download PDFInfo
- Publication number
- CN104088613A CN104088613A CN201410339698.XA CN201410339698A CN104088613A CN 104088613 A CN104088613 A CN 104088613A CN 201410339698 A CN201410339698 A CN 201410339698A CN 104088613 A CN104088613 A CN 104088613A
- Authority
- CN
- China
- Prior art keywords
- water
- reservoir
- salinity
- pellicle
- low
- 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
Abstract
The invention provides a method for increasing the fractured reservoir recovery ratio, in particular to the method for increasing the low-pressure low-permeability fractured reservoir crude oil recovery ratio through osmotic pressure energy increase. A film-forming material is injected in a fractured reservoir, the film-forming material is any one of guanidine gum formed by cross linkage of polyethylene glycol and boric acid, cellulose acetate, silicate and cupric ferrocyanide, a semi-permeable film is formed on the wall face of a fracture, water with the mineralization degree lower than the mineralization degree of bound water of the reservoir by over two times in range is injected in the reservoir, at this moment, a chemical potential gradient is formed between the two sides of the semi-permeable film, water with the low mineralization degree in the fracture penetrates through the semi-permeable film and enters a reservoir matrix under the action of the chemical potential gradient, pressure or energy of the reservoir is increased, self-water suction oil discharge is achieved, and the yield of crude oil in the low-pressure low-permeability fractured reservoir can be increased to a great extent.
Description
Technical field
The present invention relates to a kind of fractured reservoir recovery ratio method that improves, particularly utilize osmotic pressure energization to improve fractured reservoir recovery ratio method, belong to technical field of petroleum extraction.
Background technology
Intrinsic fracture oil deposil erude petroleum recovery ratio is normally low-down, and especially, in middle and high infiltration fractured carbonate rock oil reservoir, oil recovery factor is often less than 15% of these reservoir geology reserves.Generally, in Fractured Low-Permeability Reservoir, be difficult to the oil flow channel that provides one to flow to intrinsic fracture from matrix.Under normal circumstances, fractured reservoir uses water drive oil mode to exploit, but water drive oil mode only produces effect to height infiltration intrinsic fracture oil reservoir.Because many Fractured carbonate oil reservoirs are wetting or oily wet for mixing, water drive cannot improve the oil recovery factor in reservoir matrix and crack, and one of them basic problem is how to improve water drive sweep efficiency.It has been generally acknowledged that injected water pumps into reservoir via producing well, then in the intrinsic fracture system of high permeability, can water breakthrough occur rapidly, remaining most of oil remains in reservoir matrix.Even in the successful situation of water-drive oil recovery, whole oil recovery process is also very slow, and production fluid moisture content can be very high.The factors such as mixing soaks or oil wets tend to affect whole process.Therefore, how to improve fractured reservoir oil recovery factor, especially low pressure and low permeability fractured reservoir, has become the key of such oil reservoir of Efficient Development.
Pellicle is the film of certain molecule of a kind of confession or ion diffusion turnover, and different particles are passed through to have optionally film.The such as collodion film of cell membrane, pericystium, parchment and artificial system etc.Modern pellicle is also for porosity wall (as porous ceramics) and make suitable compound (as iron copper cyanider) be deposited in its hole to make.Pellicle is used for permeating colloidal sol and measures osmotic pressure etc.The biological nutrient of drawing is also undertaken by pellicle, is the pellicle of making through special process with macromolecular material, and it only allows hydrone to see through, and does not allow solute to pass through.Make in the time that the former water pressure of pellicle one side exceedes osmotic pressure with high-pressure pump, the hydrone in former water just can see through pellicle enter opposite side, thereby obtains pure water.And dissolving in former water and the inorganic salts of non-dissolving, heavy metal ion, organic matter, thalline, the materials such as colloid cannot pass through pellicle, can only stay in condensed water and be let go.Reverse osmosis equipment is widely used in pharmaceuticals industry, beverage industry, electronics, power industry etc.Yet there are no Immunohistochemistry for improving the report of oil recovery factor.
Summary of the invention
The object of the invention is to provide a kind of fractured reservoir recovery ratio method that improves.
Object of the present invention realizes like this: by be injected into membrane material in fractured reservoir, make it form pellicle in oil reservoir stromal surface (being crack wall); In crack, inject low salinity water again, the salinity of this low salinity water is lower than the salinity of irreducible water in reservoir, extreme difference is between the two more than 2 times, utilize between the high salinity irreducible water in low salinity water and the reservoir injecting and have chemical potential difference, so just can form in pellicle both sides osmotic pressure; Under the effect of osmotic pressure, the water in low mineralization injected water enters reservoir matrix by pellicle, increases reservoir pressure or increases reservoir energy; The water entering in reservoir matrix is discharged the crude oil storing in hole, realizes from drawing water oil extraction, reaches the object of extraction crude oil from low pressure or low energy fractured reservoir.
Described filmogen is any one of polyethylene glycol, boric acid crosslinked guanidine glue, cellulose acetate, silicate and copper ferrocyanide etc., and concentration is 0.12mol/L～0.60mol/L.Filmogen can once inject and also can repeat to inject, to set up or to re-establish pellicle.
The invention has the beneficial effects as follows: owing to injecting the filmogen that can form pellicle in fractured reservoir, make it form one deck at crack wall and have the diactinic pellicle of selection, this layer of pellicle separated matrix system and Fracture System.Because crack is different with salinity moisture in matrix, therefore form concentration difference in pellicle both sides.In matrix, the salinity of water is high, and chemical potential is lower; And the salinity of water is low in crack, chemical potential is higher.Under the effect of chemical potential gradient, water enters into through pellicle the side that chemical potential is low from the high side of chemical potential, until the chemical potential of pellicle both sides reaches balance.Injected water, under the effect of osmotic pressure, enters into oil reservoir matrix by crack, increases fractured reservoir reservoir matrix internal energy.Utilize pellicle to make to set up permeable pressure head between the concentrated water in low salinity water and the matrix in crack, under the effect of permeable pressure head, water in crack enters matrix automatically, crude oil in reservoir matrix is ejected, realize automatic water-drawing and recover the oil, thereby reach the object that improves fractured reservoir recovery ratio.
Brief description of the drawings
Fig. 1 is the schematic diagram that osmotic pressure energization improves fractured reservoir recovery ratio.
Fig. 2 is the process flow diagram that osmotic pressure energization improves fractured reservoir recovery ratio.
Detailed description of the invention
Further describe the present invention below in conjunction with drawings and Examples.
Fig. 1 is the principle schematic that osmotic pressure energization improves fractured reservoir recovery ratio, its principle is under the effect of pellicle, water in crack enters in reservoir matrix pores automatically, both can increase the pressure in matrix pores, crude oil in matrix pores can be discharged again, there is the function of draw water-energization-oil extraction, realize fractured reservoir and improve oil recovery factor from the oil extraction that draws water.
Fig. 2 is the process flow diagram that osmotic pressure energization improves fractured reservoir recovery ratio.To the filmogen that injects pellicle in fractured reservoir, make it form pellicle at the crack of fractured reservoir reservoir matrix wall, pellicle is separated oil reservoir matrix and crack.Because the salinity of water in oil reservoir matrix is higher than the salinity of water in crack, there is extreme difference in the salinity of two kinds of water, has just set up a chemical potential gradient so between the two.Under the effect of osmotic pressure, the hydrone in crack in low salinity water, through pellicle, spontaneously enters into oil reservoir matrix and goes, and increases the energy in oil reservoir matrix, forces the crude oil storing in oil reservoir matrix to be discharged.
[embodiment 1]
Making permeability is 32 × 10
-3μ m
2cracking rock core, the water that in cracking rock core, first saturated salinity is 80000mg/L, then sets up high salinity irreducible water (salinity is 80000mg/L) with the Simulation of Crude Oil saturated core of 2.0mPa.s; Removal of core, places it in the water suction oil extraction instrument that fills 5000mg/L low salinity water, and at this moment in injected water salinity and cracking rock core, the extreme difference of constraint water salinity is 16, and former oil volume discharged in record, and calculating gained oil recovery factor is 0.2%.
[embodiment 2]
Making permeability is 28 × 10
-3μ m
2cracking rock core, the water that in cracking rock core, first saturated salinity is 80000mg/L, then sets up high salinity irreducible water (salinity is 80000mg/L) with the Simulation of Crude Oil saturated core of 2.0mPa.s; Then, to the copper ferrocyanide pellicle filmogen that injects 0.60mol/L in this cracking rock core, close and within 12 hours, make filmogen form pellicle at crack wall; Removal of core, places it in the water suction oil extraction instrument that fills 5000mg/L low salinity water, and at this moment in injected water salinity and cracking rock core, the extreme difference of constraint water salinity is 16, records crude oil output volume, and calculating gained oil recovery factor is 12.6%.
[embodiment 3]
Making permeability is 30 × 10
-3μ m
2cracking rock core, the water that in cracking rock core, first saturated salinity is 40000mg/L, then sets up high salinity irreducible water (salinity is 40000mg/L) with the Simulation of Crude Oil saturated core of 2.0mPa.s; Then, to the copper ferrocyanide pellicle filmogen that injects 0.60mol/L in this cracking rock core, close and within 12 hours, make filmogen form pellicle at crack wall; Removal of core, places it in the water suction oil extraction instrument that fills 5000mg/L low salinity water, and at this moment in injected water salinity and cracking rock core, the extreme difference of constraint water salinity is 8, records crude oil output volume, and calculating gained oil recovery factor is 7.8%.
[embodiment 4]
Making permeability is 30 × 10
-3μ m
2cracking rock core, the water that in cracking rock core, first saturated salinity is 10000mg/L, then sets up high salinity irreducible water (salinity is 10000mg/L) with the Simulation of Crude Oil saturated core of 2.0mPa.s; Then, to the copper ferrocyanide pellicle filmogen that injects 0.60mol/L in this cracking rock core, close and within 12 hours, make filmogen form pellicle at crack wall; Removal of core, places it in the water suction oil extraction instrument that fills 5000mg/L low salinity water, and at this moment in injected water salinity and cracking rock core, the extreme difference of constraint water salinity is 2, records crude oil output volume, and calculating gained oil recovery factor is 3.2%.
[embodiment 5]
Making permeability is 28 × 10
-3μ m
2cracking rock core, the water that in cracking rock core, first saturated salinity is 80000mg/L, then sets up high salinity irreducible water (salinity is 80000mg/L) with the Simulation of Crude Oil saturated core of 2.0mPa.s; Then, to the copper ferrocyanide pellicle filmogen that injects 0.48mol/L in this cracking rock core, close and within 12 hours, make filmogen form pellicle at crack wall; Removal of core, places it in the water suction oil extraction instrument that fills 5000mg/L low salinity water, and at this moment in injected water salinity and cracking rock core, the extreme difference of constraint water salinity is 16, records crude oil output volume, and calculating gained oil recovery factor is 11.2%.
[embodiment 6]
Making permeability is 28 × 10
-3μ m
2cracking rock core, the water that in cracking rock core, first saturated salinity is 30000mg/L, then sets up high salinity irreducible water (salinity is 30000mg/L) with the Simulation of Crude Oil saturated core of 2.0mPa.s; Then, to the copper ferrocyanide pellicle filmogen that injects 0.48mol/L in this cracking rock core, close and within 12 hours, make filmogen form pellicle at crack wall; Removal of core, places it in the water suction oil extraction instrument that fills 5000mg/L low salinity water, and at this moment in injected water salinity and cracking rock core, the extreme difference of constraint water salinity is 6, records crude oil output volume, and calculating gained oil recovery factor is 5.0%.
[embodiment 7]
Making permeability is 30 × 10
-3μ m
2cracking rock core, the water that in cracking rock core, first saturated salinity is 80000mg/L, then sets up high salinity irreducible water (salinity is 80000mg/L) with the Simulation of Crude Oil saturated core of 2.0mPa.s; Then, to the copper ferrocyanide pellicle filmogen that injects 0.12mol/L in this cracking rock core, close and within 12 hours, make filmogen form pellicle at crack wall; Removal of core, places it in the water suction oil extraction instrument that fills 5000mg/L low salinity water, and at this moment in injected water salinity and cracking rock core, the extreme difference of constraint water salinity is 16, records crude oil output volume, and calculating gained oil recovery factor is 8.5%.
[embodiment 8]
Making permeability is 32 × 10
-3μ m
2cracking rock core, the water that in cracking rock core, first saturated salinity is 10000mg/L, then sets up high salinity irreducible water (salinity is 10000mg/L) with the Simulation of Crude Oil saturated core of 2.0mPa.s; Then, to the copper ferrocyanide pellicle filmogen that injects 0.12mol/L in this cracking rock core, close and within 12 hours, make filmogen form pellicle at crack wall; Removal of core, places it in the water suction oil extraction instrument that fills 5000mg/L low salinity water, and at this moment in injected water salinity and cracking rock core, the extreme difference of constraint water salinity is 2, records crude oil output volume, and calculating gained oil recovery factor is 2.6%.
According to the result of the test of above-described embodiment, confirm that osmotic pressure energization improves the feasibility of fractured reservoir oil recovery factor.This technology both can be implemented in fractured reservoir water injection well, also can in producing well, implement.In the time implementing in water injection well, first in stratum, be injected into membrane material, make it form pellicle at crack wall; Then low discharge, inject low salinity water continuously, the water under the effect of osmotic pressure in low mineralization injected water enters reservoir matrix, and the crude oil in matrix is advanced to producing well.This technology improves oil recovery factor by improving sweep efficiency, and can significantly reduce the moisture content in production fluid.When in the time that producing well is implemented, first in stratum, be injected into membrane material, make it form pellicle at crack wall; Then flow into the low salinity water that fracture spaces volume is close, the water under the effect of osmotic pressure in low mineralization injected water enters reservoir matrix, realizes from drawing water oil extraction; Closing well a period of time,, in the time of crack internal pressure and the pressure balance of reservoir matrix, open producing well and continue to produce.In producing well, this technology, by osmotic pressure energization, realizes the function of draw water-energization-oil extraction, and can repeatedly repeat, be interrupted and carry out.
In sum, osmotic pressure energization technology is to utilize pellicle to produce osmotic pressure principle, make the water in low mineralization injected water in crack enter reservoir matrix, increase intramatrical pressure or energy, there are three effects greatly of draw water-energization-oil extraction, can realize the high-efficiency and economic exploitation of low pressure, low energy fractured reservoir.
Claims (1)
1. improve a fractured reservoir recovery ratio method, it is characterized in that comprising the following steps:
(1) be injected into membrane material by Injection Well, make it form pellicle in oil reservoir stromal surface;
(2) inject a kind of low salinity water to stratum by Injection Well, set up chemical potential gradient in pellicle both sides, make water enter reservoir matrix, increase intramatrical pressure by pellicle, force the crude oil in matrix to enter producing well;
The salinity of described low salinity water is lower than the salinity of irreducible water in reservoir, and extreme difference is between the two more than 2 times;
Described filmogen is any one in polyethylene glycol, boric acid crosslinked guanidine glue, cellulose acetate, silicate and copper ferrocyanide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410339698.XA CN104088613B (en) | 2014-07-17 | 2014-07-17 | Method for increasing fractured reservoir recovery ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410339698.XA CN104088613B (en) | 2014-07-17 | 2014-07-17 | Method for increasing fractured reservoir recovery ratio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104088613A true CN104088613A (en) | 2014-10-08 |
| CN104088613B CN104088613B (en) | 2017-02-01 |
Family
ID=51636359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410339698.XA Expired - Fee Related CN104088613B (en) | 2014-07-17 | 2014-07-17 | Method for increasing fractured reservoir recovery ratio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104088613B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982552A (en) * | 2021-10-22 | 2022-01-28 | 中国石油大学(北京) | Experimental device and method for representing energy increase from crack to matrix depth |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6069118A (en) * | 1998-05-28 | 2000-05-30 | Schlumberger Technology Corporation | Enhancing fluid removal from fractures deliberately introduced into the subsurface |
| EP1333152A1 (en) * | 2002-02-01 | 2003-08-06 | Halliburton Energy Services, Inc. | Encapsulated liquid for well treatment |
| US20040007358A1 (en) * | 2000-08-07 | 2004-01-15 | Lien Larry A. | Method for secondary oil recovery |
| GB2442002A (en) * | 2006-09-08 | 2008-03-26 | Schlumberger Holdings | Method of improving recovery from hydrocarbon reservoirs |
| CN101876241A (en) * | 2009-04-30 | 2010-11-03 | 中国石油天然气股份有限公司 | Method for improving water drive recovery factor of thick positive rhythm reservoir |
| CN101970600A (en) * | 2008-02-07 | 2011-02-09 | 国际壳牌研究有限公司 | Method and composition for enhanced hydrocarbons recovery |
-
2014
- 2014-07-17 CN CN201410339698.XA patent/CN104088613B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6069118A (en) * | 1998-05-28 | 2000-05-30 | Schlumberger Technology Corporation | Enhancing fluid removal from fractures deliberately introduced into the subsurface |
| US20040007358A1 (en) * | 2000-08-07 | 2004-01-15 | Lien Larry A. | Method for secondary oil recovery |
| EP1333152A1 (en) * | 2002-02-01 | 2003-08-06 | Halliburton Energy Services, Inc. | Encapsulated liquid for well treatment |
| GB2442002A (en) * | 2006-09-08 | 2008-03-26 | Schlumberger Holdings | Method of improving recovery from hydrocarbon reservoirs |
| CN101970600A (en) * | 2008-02-07 | 2011-02-09 | 国际壳牌研究有限公司 | Method and composition for enhanced hydrocarbons recovery |
| CN101876241A (en) * | 2009-04-30 | 2010-11-03 | 中国石油天然气股份有限公司 | Method for improving water drive recovery factor of thick positive rhythm reservoir |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982552A (en) * | 2021-10-22 | 2022-01-28 | 中国石油大学(北京) | Experimental device and method for representing energy increase from crack to matrix depth |
| CN113982552B (en) * | 2021-10-22 | 2022-10-21 | 中国石油大学(北京) | Experimental device and method for representing energy increase from crack to matrix depth |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104088613B (en) | 2017-02-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2010045616A3 (en) | Method of hydrocarbon recovery | |
| CN110306960B (en) | Fracturing fluid imbibition production-increasing simulation method and device for double-hole double-permeability medium reservoir | |
| US8746334B2 (en) | Microbial enhanced oil recovery process for heavy oil accumulations | |
| CN102392129A (en) | Method and system of in-situ ore leaching and leachate discharge of ion adsorption type ore | |
| RU2478164C1 (en) | Development method of oil deposit located above gas deposit and separated from it with non-permeable interlayer | |
| CN110552671A (en) | Method for realizing high-efficiency development of heavy oil reservoir by utilizing dimethyl ether to assist CO 2 flooding | |
| CN104847302A (en) | Heavy oil reservoir water-coning-control water plugging method | |
| CN102587451B (en) | A kind of method utilizing selectively penetrating reaction wall technology preventing and treating seawater invasion | |
| CN104088613B (en) | Method for increasing fractured reservoir recovery ratio | |
| RU2569101C1 (en) | Method of decrease of water inflow to horizontal wells | |
| RU2515675C1 (en) | Isolation method of water influx to oil producer | |
| RU2487235C1 (en) | Development method of wet carbonate formation | |
| CN103880142A (en) | Method for plating iron and in situ removing arsenic for regional aquifer | |
| RU2527053C1 (en) | Development method of fractured-porous types of reservoirs | |
| CN101148984A (en) | Method for using sea water or salt water to oil field water injection and collecting process | |
| RU2342523C2 (en) | Method of implementation of vertical water flooding of oil deposit | |
| US20220380656A1 (en) | Method for unblocking a deep well plugged by an adsorbent | |
| CA2761048A1 (en) | Post cold heavy oil production with sand microbial enhanced oil recovery method | |
| CN104912533A (en) | Coal reservoir water locking damage control method | |
| RU2612059C1 (en) | Recovery method of layered heterogenetic oil reservoirs by impulse low-mineralised water flooding | |
| CN104481478B (en) | Gather the method altered and its inorganic agent used in macropore plugging on polymer flooding correspondence oil well | |
| CN113389533A (en) | CO (carbon monoxide)2Integrated method for collecting, reservoir reforming and extracting crude oil | |
| CN2534169Y (en) | Rain filtering penetration apparatus | |
| CN104533360B (en) | The poly- method altered of prevention and inorganic agent used on polymer flooding correspondence oil well | |
| CN103101992B (en) | Forward osmosis water circulation system and process for preparing drilling fracturing fluid |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170201 Termination date: 20190717 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |