CN111022024A - Acidification method for injecting foam liquid - Google Patents
Acidification method for injecting foam liquid Download PDFInfo
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- CN111022024A CN111022024A CN201911302728.9A CN201911302728A CN111022024A CN 111022024 A CN111022024 A CN 111022024A CN 201911302728 A CN201911302728 A CN 201911302728A CN 111022024 A CN111022024 A CN 111022024A
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- acid
- injected
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- injecting
- gas
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/70—Compositions for forming crevices or fractures characterised by their form or by the form of their components, e.g. foams
- C09K8/703—Foams
Abstract
The invention relates to an acidification method for injecting foam liquid. The method comprises the following steps: 1) injecting a foaming liquid: injecting a foamed liquid into the formation through a foamed liquid pressure device; 3) acidifying: and acidizing the stratum after the foam liquid is injected. The invention has the advantages of being beneficial to residual acid flowback and reducing secondary damage of stratum.
Description
Technical Field
The invention relates to the field of petroleum, in particular to an acidification method for injecting foam liquid.
Background
Acid treatment processes that squeeze acid into a formation at pressures sufficient to fracture or open an existing fracture of the formation are referred to as fracture acidizing; it can be divided into pad hydraulic acid fracturing and ordinary acid fracturing (or ordinary acid fracturing). The fracturing and acidizing are mainly used for plugging oil and gas wells with a deeper range or a low permeability zone; the pressure of acid injection is higher than the fracture pressure of oil (gas) layer, so it is called acid fracturing.
The conventional acidification method is an acid treatment measure for removing the blockage of foreign matters such as drilling fluid and putting the drilling fluid into normal production after a new well is completed or repaired. The process comprises squeezing acid solution into stratum under the pressure lower than rock rupture pressure, eroding the plugs in the stratum near the bottom of the well with the acid solution, enlarging and extending the hole seams, recovering and improving the permeability of the stratum; and then other measures are matched to finally form the following acidification operation process: circulation-pressure test-acid replacement-acid squeezing-displacement-well shut-in diffusion. The acidification method has the following disadvantages:
1. the residual acid is not completely discharged due to the actions of stratum adsorption, capillary force and the like, so that the problem of secondary damage is caused;
2. the acid residue generated by the contact of acid and crude oil in the acidification process causes the problem of secondary damage;
3. the low pressure formation has insufficient energy and the oil well has low yield.
Disclosure of Invention
The invention aims to solve the technical problems in the background art, and provides an acidification method which injects foam liquid as a front slug before injecting acid liquor into a stratum for acidification, and has the advantages of being beneficial to residual acid backflow and reducing secondary damage of the stratum.
The technical solution of the invention is as follows: the invention relates to an acidification method for injecting foam liquid, which is characterized in that: the method comprises the following steps:
1) injecting a foaming liquid: injecting a foamed liquid into the formation through a foamed liquid pressure device;
3) acidifying: and acidizing the stratum after the foam liquid is injected.
Preferably, the volume of the foaming liquid injected in step 1) is calculated according to the field situation by the following formula:
P1*V1/T1＝P2*V2/T2
wherein: p1 is the pressure of the surface injected foam liquid, V1 is the volume of the surface injected foam liquid, T1 is the temperature of the surface injected foam liquid; p2 is formation pressure, V2 is subsurface volume, T2 is formation temperature; the pressure of the surface injected foam liquid P1, the temperature of the surface injected foam liquid T1, the formation temperature T2 and the formation pressure P2 are all measured in situ, and the volume V1 of the surface injected foam liquid can be calculated by determining the subsurface volume to be injected V2.
Preferably, the foaming liquid in the step 1) is an aqueous surfactant solution.
Preferably, step 2) of injecting gas is further included between step 1) and step 3): a gas pressure device line is connected through which gas is injected into the formation.
Preferably, the volume of gas injected in step 2) is the same as the volume of foaming liquid injected in step 1).
Preferably, the gas in step 2) includes, but is not limited to, air, nitrogen, carbon dioxide, like gases, flue gases and mixtures thereof
Preferably, the gas is nitrogen or carbon dioxide.
Preferably, the specific acidification step in step 3) is as follows:
3.1) determining the required acid liquor amount and acid liquor concentration: measuring and calculating the needed acid liquid amount and acid liquid concentration according to the radius needing acidification and the formation parameters;
3.2) complex acid: using an acid tank to prepare acid according to the acid liquor amount and the acid liquor concentration calculated in the step 1), and connecting a pump truck and a wellhead;
3.3) pressure testing;
3.4) acid injection: after the pressure test is qualified, acid injection is started;
3.5) well closing reaction: starting a well closing reaction after acid injection;
3.6) returning residual acid: and (4) after the well closing reaction is finished, open-flowing, and discharging the residual acid out of the well.
Preferably, the volume of the acid solution in step 3.1) is the same as the volume of the foam liquid injected in step 1), and the acid solution concentration is 17%.
The acidizing step of the present invention may also be any conventional acidizing method for a variety of existing oil wells.
Before acid liquor is injected into the stratum for acidification, foam liquid is injected as a front slug, so that residual acid is favorably returned, and secondary damage to the stratum is reduced; meanwhile, gas can be injected after foam liquid is injected, and residual acid is completely discharged by utilizing the displacement capacity of the preposed high-pressure gas through the injected gas, so that the problem of secondary damage caused by incomplete discharge of the residual acid due to the actions of stratum adsorption, capillary force and the like is solved; crude oil and acid liquor can be separated in the stratum by utilizing the preposed gas, so that acid sludge is prevented from being generated, and the problem of secondary damage caused by acid sludge generated by contact of acid and crude oil in the acidification process is solved; meanwhile, because the injected gas can improve the formation energy within a certain range, the expansion energy of the gas is utilized to further improve the oil well yield for low-pressure formations (insufficient energy). Therefore, the invention has the following advantages:
1) the method has strong applicability and good application effect, and solves a series of problems existing in the construction process of the current acidification process, such as secondary damage to the stratum, generation of a large amount of acid sludge in the construction process, insufficient energy of the low-pressure stratum and the like.
2) The matching of process equipment is easy to realize, and the input-output ratio is high.
Detailed Description
The method of the preferred embodiment of the invention comprises the following steps:
1) injecting a foaming liquid: injecting foam liquid into the stratum through a foam liquid pressure device, wherein the volume of the injected foam liquid is calculated according to the field condition by the following formula:
P1*V1/T1＝P2*V2/T2
wherein: p1 is the pressure of the surface injected foam liquid, V1 is the volume of the surface injected foam liquid, T1 is the temperature of the surface injected foam liquid; p2 is formation pressure, V2 is subsurface volume, T2 is formation temperature; the pressure of the surface injected foam liquid P1, the temperature of the surface injected foam liquid T1, the formation temperature T2 and the formation pressure P2 are all measured in situ, and the volume V1 of the surface injected foam liquid can be calculated by determining the subsurface volume to be injected V2.
2) Gas injection: connecting a gas pressure equipment pipeline, and injecting gas into the stratum through the gas pressure equipment; the volume of gas injected is the same as the volume of foam liquid injected in step 1). The gas includes, but is not limited to, air, nitrogen, carbon dioxide, quasi-gases, flue gases and mixtures thereof, preferably nitrogen or carbon dioxide.
3) Acidifying: acidizing the stratum after the gas is injected;
3.1) determining the required acid liquor amount and acid liquor concentration: measuring and calculating the needed acid liquid amount and acid liquid concentration according to the radius needing acidification and the formation parameters; wherein the volume of the acid solution is the same as the volume of the foam liquid injected in the step 1), and the concentration of the acid solution is 17 percent;
3.2) complex acid: using an acid tank to prepare acid according to the acid liquor amount and the acid liquor concentration calculated in the step 3.1), and connecting a pump truck and a wellhead;
3.3) pressure testing;
3.4) acid injection: after the pressure test is qualified, acid injection is started;
3.5) well closing reaction: starting a well closing reaction after acid injection;
3.6) returning residual acid: and (4) after the well closing reaction is finished, open-flowing, and discharging the residual acid out of the well.
The first specific embodiment of the present invention comprises the following steps:
1) and (3) injecting an aqueous surfactant solution: in an oil well site, the injection radius of the surfactant aqueous solution is 2 meters, the thickness of an oil layer is 10 meters, the porosity of the oil layer is 13.17, V2 is 2018 square, P2 is 17 MPa, P1 is 40 MPa, T1 is 20 ℃, T2 is 70 ℃, the volume of the injected surfactant aqueous solution is 245 square calculated by the formula P1V 1/T1-P2V 2/T2, a pipeline of a foam liquid pressure device is connected, and the 245 square surfactant aqueous solution is injected into a stratum through the foam liquid pressure device;
2) injecting nitrogen gas: connecting a gas pressure equipment pipeline, injecting nitrogen into the stratum through the gas pressure equipment, wherein the volume of the injected nitrogen is 245 square;
3) acidifying: acidizing the stratum after the gas is injected;
3.1) determining the required acid liquor amount and acid liquor concentration: determining the volume of the acid liquor to be 245 square and the acid liquor concentration to be 17 percent;
3.2) complex acid: using an acid tank to prepare acid according to the acid liquor amount and the acid liquor concentration calculated in the step 3.1), and connecting a pump truck and a wellhead;
3.3) pressure testing;
3.4) acid injection: after the pressure test is qualified, acid injection is started;
3.5) well closing reaction: starting a well closing reaction after acid injection;
3.6) returning residual acid: and (4) after the well closing reaction is finished, open-flowing, and discharging the residual acid out of the well.
The second embodiment of the present invention comprises the following steps:
1) and (3) injecting an aqueous surfactant solution: in an oil well site, the injection radius of the surfactant aqueous solution is 2 meters, the thickness of an oil layer is 12 meters, the porosity of the oil layer is 12.37, then V2 is 2274.6 square, P2 is 19 MPa, P1 is 48 MPa, T1 is 25 ℃, T2 is 69 ℃, the volume of the injected surfactant aqueous solution is 326.2 square calculated by the formula P1V 1/T1-P2V 2/T2, a foam liquid pressure equipment pipeline is connected, and the 326.2 square surfactant aqueous solution is injected into the stratum through the foam liquid pressure equipment;
3) acidifying: and acidizing the stratum after the gas is injected.
3.1) determining the required acid liquor amount and acid liquor concentration: determining the volume of the acid liquor to be 326.2 square and the acid liquor concentration to be 17%;
3.2) complex acid: using an acid tank to prepare acid according to the acid liquor amount and the acid liquor concentration calculated in the step 3.1), and connecting a pump truck and a wellhead;
3.3) pressure testing;
3.4) acid injection: after the pressure test is qualified, acid injection is started;
3.5) well closing reaction: starting a well closing reaction after acid injection;
3.6) returning residual acid: and (4) after the well closing reaction is finished, open-flowing, and discharging the residual acid out of the well.
The third specific embodiment of the present invention comprises the following steps:
1) and (3) injecting an aqueous surfactant solution: in an oil well site, the injection radius of the surfactant aqueous solution is 2 meters, the thickness of an oil layer is 8 meters, the porosity of the oil layer is 11.57, then V2 is 1418.3 square, P2 is 20 MPa, P1 is 50 MPa, T1 is 18 ℃, T2 is 72 ℃, the volume of mixed gas injected into the surfactant aqueous solution is 141.8 square calculated by the formula P1V 1/T1-P2V 2/T2, a foam liquid pressure equipment pipeline is connected, and the surfactant aqueous solution of 141.8 square is injected into a stratum through foam liquid pressure equipment;
2) injecting carbon dioxide gas: connecting a gas pressure equipment pipeline, and injecting carbon dioxide into the stratum through the gas pressure equipment; the volume of the injected carbon dioxide gas is 141.8 square;
3) acidifying: and acidizing the stratum after the gas is injected.
3.1) determining the required acid liquor amount and acid liquor concentration: determining the volume of the acid liquor to be 141.8 square and the acid liquor concentration to be 17%;
3.2) complex acid: using an acid tank to prepare acid according to the acid liquor amount and the acid liquor concentration calculated in the step 3.1), and connecting a pump truck and a wellhead;
3.3) pressure testing;
3.4) acid injection: after the pressure test is qualified, acid injection is started;
3.5) well closing reaction: starting a well closing reaction after acid injection;
3.6) returning residual acid: and (4) after the well closing reaction is finished, open-flowing, and discharging the residual acid out of the well.
Through the three oil well site embodiments, compared with an oil well site only injected with acid, the residual acid flow rate of the method disclosed by the invention is improved by more than 60%, the single-well yield is improved by more than one time, and the continuous and stable yield is improved by more than one year.
The above embodiments are only specific embodiments disclosed in the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention disclosed in the present invention should be subject to the scope of the claims.
Claims (9)
1. An acidification method for injecting foam liquid is characterized in that: the method comprises the following steps:
1) injecting a foaming liquid: injecting a foamed liquid into the formation through a foamed liquid pressure device;
3) acidifying: and acidizing the stratum after the foam liquid is injected.
2. An acidification method for injecting a foamed liquid according to claim 1, characterized in that: the volume of the foam liquid injected in the step 1) is calculated according to the field condition by the following formula:
P1*V1/T1＝P2*V2/T2
wherein: p1 is the pressure of the surface injected foam liquid, V1 is the volume of the surface injected foam liquid, T1 is the temperature of the surface injected foam liquid; p2 is the formation pressure, V2 is the subsurface volume, and T2 is the formation temperature.
3. A method of acidifying injected foam liquid according to claim 2, characterized in that: the foam liquid in the step 1) is an aqueous surfactant solution.
4. A method of acidification of injected foam liquids according to claim 2 or 3, characterized in that: the step 2) of injecting gas is further included between the step 1) and the step 3): a gas pressure device line is connected through which gas is injected into the formation.
5. An acidification method for injecting a foamed liquid according to claim 4, wherein: the volume of the injected gas in the step 2) is the same as that of the injected foam liquid in the step 1).
6. An acidification method for injecting a foamed liquid according to claim 5, wherein: the gas in the step 2) includes but is not limited to air, nitrogen, carbon dioxide, quasi-gas, flue gas and the mixture of the above gases.
7. An acidification method for injecting a foamed liquid according to claim 6, wherein: the gas is preferably nitrogen or carbon dioxide.
8. An acidification method for injecting a foamed liquid according to claim 7, wherein: the step 3) of acidification comprises the following specific steps:
3.1) determining the required acid liquor amount and acid liquor concentration: measuring and calculating the needed acid liquid amount and acid liquid concentration according to the radius needing acidification and the formation parameters;
3.2) complex acid: using an acid tank to prepare acid according to the acid liquor amount and the acid liquor concentration calculated in the step 3.1), and connecting a pump truck and a wellhead;
3.3) pressure testing;
3.4) acid injection: after the pressure test is qualified, acid injection is started;
3.5) well closing reaction: starting a well closing reaction after acid injection;
3.6) returning residual acid: and (4) after the well closing reaction is finished, open-flowing, and discharging the residual acid out of the well.
9. An acidification method for injecting a foamed liquid according to claim 8, wherein: the volume of the acid liquor in the step 3.1) is the same as that of the foam liquor injected in the step 1), and the acid liquor concentration is 17%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911302728.9A CN111022024A (en) | 2019-12-19 | 2019-12-19 | Acidification method for injecting foam liquid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911302728.9A CN111022024A (en) | 2019-12-19 | 2019-12-19 | Acidification method for injecting foam liquid |
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| CN111022024A true CN111022024A (en) | 2020-04-17 |
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| CN201911302728.9A Pending CN111022024A (en) | 2019-12-19 | 2019-12-19 | Acidification method for injecting foam liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113137215A (en) * | 2021-05-08 | 2021-07-20 | 中国石油大学(华东) | Method for increasing yield and injection of flue gas desulfurization and denitrification coupling reservoir |
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| CN113137215A (en) * | 2021-05-08 | 2021-07-20 | 中国石油大学(华东) | Method for increasing yield and injection of flue gas desulfurization and denitrification coupling reservoir |
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Application publication date: 20200417 |