CN114427407A - Water injection huff and puff oil production method for low-pore ultralow-permeability reservoir - Google Patents
Water injection huff and puff oil production method for low-pore ultralow-permeability reservoir Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 51
- 239000007924 injection Substances 0.000 title claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000011148 porous material Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000004094 surface-active agent Substances 0.000 claims abstract description 73
- 239000000243 solution Substances 0.000 claims abstract description 72
- 238000011084 recovery Methods 0.000 claims abstract description 22
- 230000035699 permeability Effects 0.000 claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 9
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical group C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims description 9
- 229960003237 betaine Drugs 0.000 claims description 9
- 230000000638 stimulation Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims 3
- 239000003921 oil Substances 0.000 abstract description 30
- 239000010779 crude oil Substances 0.000 abstract description 11
- 238000000605 extraction Methods 0.000 abstract description 4
- 230000000704 physical effect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 239000003292 glue Substances 0.000 description 11
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 8
- 239000010410 layer Substances 0.000 description 7
- 238000005213 imbibition Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229920002907 Guar gum Polymers 0.000 description 4
- 230000000844 anti-bacterial effect Effects 0.000 description 4
- 239000003899 bactericide agent Substances 0.000 description 4
- 239000000665 guar gum Substances 0.000 description 4
- 229960002154 guar gum Drugs 0.000 description 4
- 235000010417 guar gum Nutrition 0.000 description 4
- 239000001103 potassium chloride Substances 0.000 description 4
- 235000011164 potassium chloride Nutrition 0.000 description 4
- 239000003129 oil well Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- -1 alkyl dimethyl tertiary amine Chemical class 0.000 description 2
- 150000001450 anions Chemical group 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
- 150000007942 carboxylates Chemical class 0.000 description 2
- 150000001768 cations Chemical group 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- FDRCDNZGSXJAFP-UHFFFAOYSA-M sodium chloroacetate Chemical compound [Na+].[O-]C(=O)CCl FDRCDNZGSXJAFP-UHFFFAOYSA-M 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a water injection huff and puff oil production method of a low-pore ultra-low-permeability reservoir, belonging to the field of oil field exploitation. The water injection huff and puff oil extraction method of the low-pore ultra-low permeability reservoir comprises the following steps: 1) injecting a surfactant solution into the formation; the injection displacement of the surfactant solution is not less than the critical injection displacement for fracturing the stratum; 2) stewing; 3) and (5) opening a well to pump for production. The water injection huff and puff oil extraction method of the low-pore ultra-low permeability reservoir can effectively improve the reservoir pressure, change the oil-water distribution in the reservoir, displace the crude oil in small pores into large pores and improve the crude oil recovery ratio aiming at the problems of imperfect oil-water well pattern, poor physical properties and low natural productivity of the low-pore ultra-low permeability reservoir.
Description
Technical Field
The invention relates to a water injection huff and puff oil production method of a low-pore ultra-low-permeability reservoir, and particularly belongs to the field of oil field exploitation.
Background
Waterflooding huff and puff oil recovery is an important technology for improving the development effect of oil fields in recent years. Along with continuous exploitation, the reservoir pressure of an oil reservoir is reduced, the yield is reduced, water is injected into the reservoir from an oil well through a water injection huff and puff process, the water injected into the reservoir preferentially enters favorable positions with high porosity, high permeability and the like, after the well is closed, the injected aqueous solution is displaced with crude oil in the middle and small pore throats under the action of capillary force, oil and water in the reservoir are redistributed, then the well is opened for production, and the crude oil displaced to the high-pore high-permeability zone is exploited, so that the recovery ratio of the crude oil is improved.
The reservoir burial depth of the Weibei oilfield is 300-650 m, the average burial depth is 550m, the sand body thickness is large, and 3 oil layers develop. The main oil layer is 3 long oil layers, the interlayer distribution of each oil layer is greatly changed, the stress difference between the reservoir layer and the interlayer is small, the average porosity is 7.2 percent, and the average permeability is 0.76 multiplied by 10-3μm2A low-pore ultralow-permeability reservoir stratum; wherein the oil-bearing area of the long 3 oil reservoirs is 220.67km2Geological reserve 10474.1 × 104t. After several years of exploitation, the reservoir pressure is reduced, and the deficit is serious; in addition, the pressure of the water injection system is high, the pressure of the water injection system is low,The factors such as the pollution of a shaft stratum and the like cause serious short injection of a water injection well, insufficient energy of an oil well reservoir and low pressure, so that the crude oil recovery rate is low.
Disclosure of Invention
The invention aims to provide a water injection huff and puff oil production method of a low-pore ultra-low-permeability oil reservoir, which can effectively improve the crude oil recovery rate.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a water injection huff and puff oil extraction method of a low-pore ultra-low-permeability reservoir comprises the following steps:
1) injecting a surfactant solution into the formation; the injection displacement of the surfactant solution is not less than the critical injection displacement for fracturing the stratum; 2) stewing; 3) and (5) opening a well to pump for production.
The water injection huff and puff oil extraction method of the low-pore ultra-low permeability reservoir can effectively improve the reservoir pressure, change the oil-water distribution in the reservoir, displace the crude oil in small pores into large pores and improve the crude oil recovery ratio aiming at the problems of imperfect oil-water well pattern, poor physical properties and low natural productivity of the low-pore ultra-low permeability reservoir.
The low-pore ultralow-permeability oil reservoir has the porosity of less than 15 percent, the permeability of less than 1mD and low natural productivity of an oil well (daily produced fluid of less than 1 m)3) Or an oil reservoir without natural energy production. The critical displacement is the critical water injection displacement of the simulated production fracturing according to the hydraulic fracturing. The surfactant solution is obtained by mixing a surfactant and water. Further, the mass concentration of the surfactant solution is 0.1-0.4%. Further, the surfactant is a betaine type surfactant.
In order to equalize the concentration in the water injection swept volume and improve the imbibition displacement efficiency, the surfactant solution is injected into the stratum in a concentration-variable mode of 0.4% -0.2% -0.1%.
In order to further improve the imbibition replacement efficiency of the stratum, the injection volume ratio of the surfactant solution with the concentration of 0.4%, the surfactant solution with the concentration of 0.2% and the surfactant solution with the concentration of 0.1% is (25-35): (40-60): (10-15).
When the stratum is fractured in a horizontal seam, the temporary plugging agent is injected into the stratum in the process of injecting the surfactant solution. The fracture complexity of the horizontal fracture reservoir is small, the fracture complexity can be improved by injecting the temporary plugging agent, and the contact area between the injected surfactant solution and the reservoir is increased.
Further, injecting the surfactant solution into the stratum according to the variable concentration of 0.4% -0.2% -0.1%, wherein the injection sequence of the surfactant solution with various concentrations and the temporary plugging agent is 0.4% of the surfactant solution, the temporary plugging agent, 0.2% of the surfactant solution and 0.1% of the surfactant solution.
Further, in order to more fully and effectively deliver the temporary plugging agent into the ground joint, the injection method of the temporary plugging agent comprises the steps of injecting the raw glue solution into the stratum, then injecting the mixture of the raw glue solution and the temporary plugging agent, and finally injecting the raw glue solution. Injecting the primary glue solution to replace the surfactant solution in the shaft; and finally, injecting the original glue solution to replace the temporary plugging agent to the end part of the crack, opening a new crack and increasing the contact area between the injected surfactant solution and the reservoir. The injection amount of the primary glue solution in three stages is respectively 1.5 times of the construction shaft volume, the liquid volume of 2 minutes under the current discharge amount and the fracture expansion volume under the current construction.
The raw gum solution is obtained by mixing guar gum, potassium chloride, a bactericide, a surfactant and water, wherein the mass concentrations of the guar gum, the potassium chloride, the bactericide and the surfactant in the raw gum solution are respectively 0.2%, 1%, 0.2% and 0.2%. The surfactant in the raw glue solution is a betaine surfactant. Preferably, the betaine surfactant in the invention is composed of a cation part of a quaternary ammonium salt surfactant and an anion part of a carboxylate surfactant, and has better performance than an amino acid type amphoteric surfactant, and the betaine surfactant is prepared by reacting single long-chain alkyl dimethyl tertiary amine and sodium chloroacetate as main raw materials.
Furthermore, the injection liquid amount of the surfactant solution is 0.12-0.15 times of the pore volume of the reservoir in the water injection range. When the void volume of the reservoir is 1PV, the injection liquid amount of the surfactant solution is 0.12-0.15 PV. After the surfactant solution is injected into the stratum, the pressure of the reservoir can reach 0.8-1.2 times of the original pressure of the reservoir, so that the swept volume of the injected surfactant solution is enlarged, and the contact area between the injected surfactant solution and the reservoir is increased.
Further, the injection pressure of the surfactant solution is not less than the critical pressure for fracturing the formation and not more than the critical pressure for resisting the internal pressure of the casing at the bottom of the well.
If there is a test injection, the amount of the test injection surfactant solution is counted as the injection amount of the surfactant solution.
Furthermore, in order to fully diffuse the injected water in the reservoir, the injected water and the crude oil are subjected to imbibition displacement, and the soaking time is 30-60 days.
Drawings
FIG. 1 is a schematic diagram of a waterflooding stimulation oil recovery mechanism of an embodiment of the present invention;
FIG. 2 is a simulation diagram of water injection sweep range in an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is explained in detail in the following by combining WB-1 wells of certain oil reservoirs in the Weibei region. The betaine surfactant in the embodiment is composed of a cation part of a quaternary ammonium salt surfactant and an anion part of a carboxylate surfactant, and is specifically prepared by reacting single long-chain alkyl dimethyl tertiary amine and sodium chloroacetate as main raw materials.
Examples
In the waterflooding and huff-and-puff oil recovery method for the low-pore ultra-low-permeability reservoir, the waterflooding and huff-and-puff oil recovery mechanism is shown in fig. 1 and comprises the following contents:
(1) characterization of low-pore, ultra-low permeability reservoirs
The target layer is an oil-water layer, the burying depth is 391.0-396.0 m, and the reservoir temperature is 31 ℃. The plane is not provided with a corresponding water injection well.
Physical properties of rocks: permeability of 0.82X 10-3μm2(ii) a Porosity 12.4%; the oil saturation was 38.5%.
Logging parameters: resistivity of 23.8 Ω · m; the sound wave time difference was 260.8. mu.s/m.
(2) Adopting water injection huff and puff technology
A. Injection amount: according to the hydraulic fracturing simulation production fracturing horizontal crack length of 80m and the injected water wave and formation volume of 42390m3The injection quantity is calculated to be 0.15 times of the pore volume of the reservoir, and the required injection water quantity is 790m3The simulation of the water injection sweep range is shown in FIG. 2;
B. when the WB-1 well is fractured and put into production, the pre-fracture test is 1.0m3The emission of the fracturing stratum under the min is 2.2-3.1 m3Min, after comprehensively considering the problems of construction environment, operation cost (car group cost) and the like in the Weibei region, the injection discharge capacity of injecting the surfactant solution into the WB-1 well is 1.0-2.4 m3/min；
C. When the WB-1 well is fractured and put into production, the prepressure testing fracturing pump pressure is 21MPa, the bottom fracture pressure is 24.7MPa (namely the critical pressure for fracturing the stratum), the wellhead extension pressure is 11MPa, the stratum extension pressure is 14.7MPa, the problems of construction environment, operation cost (car group cost), liquid friction (2.7 MPa of surfactant solution along the way), construction pressure limitation (30MPa) and the like in the Weibei region are comprehensively considered, the WB-1 well injection pressure is predicted to be 23.5MPa, and the bottom casing is predicted to bear the internal pressure of 24.7 MPa;
D. considering the dilution effect of reservoir fluid and the high permeability of a near wellbore zone, the concentration of the surfactant solution is injected into a stratum by adopting a variable concentration of 0.4-0.2-0.1%, so that the concentration in a water injection wave volume is balanced, and the imbibition displacement efficiency is improved;
E. and (3) performing WB-1 well fracturing production, wherein the artificial fracture is a horizontal fracture, injecting water for huffing and puff beyond the fracture pressure of the stratum, adding a temporary plugging agent, improving the complexity of the fracture, and expanding the imbibition wave and the volume.
F. The liquid formula comprises:
a. the surfactant solution is obtained by mixing a betaine type surfactant and clear water, and the mass concentration of the surfactant in the surfactant solution is 0.1-0.4%;
b. the raw gum solution is obtained by mixing guar gum, potassium chloride, bactericide, betaine type surfactant and clear water, wherein the mass concentrations of the guar gum, the potassium chloride, the bactericide and the betaine type surfactant in the raw gum solution are 0.2%, 1%, 0.2% and 0.2% respectively.
G. The pump injection procedure, the specific process parameters are shown in table 1:
a. using 0.4% surfactant solution to carry out test injection;
b. 230m of 0.4% surfactant solution was injected3；
c. Displacing 2m of crude rubber solution3；
d. By 3m3Adding 125kg of temporary plugging agent into the raw glue solution;
e. by 20m3The temporary plugging agent is sent into the seam by the original glue solution;
f. 220m of 0.2% surfactant solution was injected3；
g. Displacing 2m of crude rubber solution3；
h. By 3m3Adding 175kg of temporary plugging agent into the raw glue solution;
i. by 20m3The temporary plugging agent is sent into the seam by the original glue solution;
j. 220m of 0.2% surfactant solution was injected3；
k. Injecting 0.1% surfactant solution 100m3；
h. Soaking for 30 days to ensure that the injected water is fully diffused in the reservoir and is subjected to imbibition displacement with the crude oil;
i. and (5) opening the well and pumping for production.
Table 1 injection process pumping procedure
The water-flooding huff-and-puff oil recovery method of the low-pore ultra-low permeability reservoir can improve the single-well recovery ratio by 10-15%, and the single-well recovery ratio of the conventional water-flooding huff-and-puff oil recovery method without adding the surfactant can be improved by about 5%.
Claims (10)
1. A water injection huff and puff oil production method of a low-pore ultra-low-permeability reservoir is characterized by comprising the following steps of:
1) injecting a surfactant solution into the formation; the injection displacement of the surfactant solution is not less than the critical injection displacement for fracturing the stratum;
2) stewing;
3) and (5) opening a well to pump for production.
2. The waterflooding oil recovery method for the low-pore ultra-low permeability reservoir as claimed in claim 1, wherein the mass concentration of the surfactant solution is 0.1-0.4%; the surfactant is a betaine type surfactant.
3. The waterflooding stimulation oil recovery method for the low-pore ultra-low permeability reservoir as claimed in claim 2, wherein the surfactant solution is injected into the formation in a concentration varying manner of 0.4% -0.2% -0.1%.
4. The waterflooding stimulation oil recovery method for the low-pore ultra-low permeability reservoir as claimed in claim 3, wherein the injection volume ratio of the 0.4% surfactant solution, the 0.2% surfactant solution and the 0.1% surfactant solution is (25-35): (40-60): (10-15).
5. The waterflooding stimulation oil recovery method for a low-pore ultralow-permeability reservoir according to claim 2 or 3, wherein when the fracture of the stratum is in the form of a horizontal seam, the temporary plugging agent is injected into the stratum during the process of injecting the surfactant solution.
6. The waterflooding oil recovery method for the low-pore ultra-low permeability reservoir as defined in claim 5, wherein the surfactant solution is injected into the formation in a variable concentration of 0.4% -0.2% -0.1%, and the injection sequence of the surfactant solution with each concentration and the temporary plugging agent is 0.4% of the surfactant solution, the temporary plugging agent, 0.2% of the surfactant solution and 0.1% of the surfactant solution.
7. The waterflooding stimulation oil recovery method for the low-pore ultralow-permeability reservoir as claimed in claim 5, wherein the temporary plugging agent is injected by injecting the virgin cement solution into the formation, then injecting the mixture of the virgin cement solution and the temporary plugging agent, and finally injecting the virgin cement solution.
8. The waterflooding oil recovery method for the low-pore ultralow-permeability reservoir as claimed in claim 1, wherein the injection amount of the surfactant solution is 0.12-0.15 times of the pore volume of the reservoir in the waterflooding range.
9. The waterflood stimulation oil recovery method for a low-pore ultra-low permeability reservoir as defined in claim 1, wherein the injection pressure of the surfactant solution is not less than the critical pressure for fracturing the formation and not more than the critical pressure for resisting the internal pressure of the bottom-hole casing.
10. The waterflooding huff and puff oil recovery method for the low-pore ultra-low permeability reservoir as claimed in claim 1, wherein the soaking time is 30-60 days.
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