CN110056334B - Oil well non-flowback working fluid and steering and energizing integrated totally-enclosed acidizing construction process - Google Patents
Oil well non-flowback working fluid and steering and energizing integrated totally-enclosed acidizing construction process Download PDFInfo
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- CN110056334B CN110056334B CN201910317348.6A CN201910317348A CN110056334B CN 110056334 B CN110056334 B CN 110056334B CN 201910317348 A CN201910317348 A CN 201910317348A CN 110056334 B CN110056334 B CN 110056334B
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
Abstract
The invention relates to the technical field of oil extraction engineering, in particular to a totally-enclosed acidification construction process integrating no-flowback working fluid and steering and energy increasing of an oil well. The problems that the acidizing movable pipe column and the backflow acid liquor of a common oil well pollute the environment, and if the acidizing movable pipe column and the backflow acid liquor are not discharged, a pump is blocked, a rod is broken, production is influenced and the like are mainly solved. The invention is composed of working fluid and non-drainage steering and energizing integrated totally-enclosed acidification construction process, wherein the working fluid is composed of pad fluid, acid fluid, steering fluid, treatment fluid and energizing fluid, the integrated totally-enclosed acidification construction process is a combination of pad well washing, steering acidification de-plugging, neutralization energizing and sealing, which not only solves the problem of residual acid corrosion, but also improves the yield increasing effect. The present invention can effectively remove organic and inorganic scales of oil well reservoirs and improve the oil well yield under the conditions of no movement of a pipe column, no flowback, totally closed and no pollution.
Description
The technical field is as follows: the invention relates to the technical field of oil extraction engineering, in particular to a totally-enclosed acidification construction process integrating no-flowback working fluid and steering and energy increasing of an oil well.
Background art: at present, the acidification construction of an oil well needs to operate a movable pipe column, and after acidification, gas lift liquid drainage is carried out, so that the process is complex and the construction period is long. In the liquid discharging process, the returned liquid contains a large amount of substances such as residual acid, dirty oil and the like to cause environmental pollution; the production is not carried out again, untreated acid liquor corrodes pumps and pipes, and pump blockage and rod breakage of the production well are aggravated; the residual liquid with high mineralization degree also causes the oil-water separator to be incapable of working normally, so that the production system is crashed, the normal production is influenced, and the application scale of oil well acidification is limited.
The invention content is as follows: the invention aims to provide a steering and energizing integrated totally-enclosed acidification construction process for an oil well, which can ensure the normal production of the oil well and an oil-water separation system, does not move a pipe column, does not discharge casing gas and acid liquid after acidification, and has short construction period.
The technical scheme of the invention is as follows: a kind of oil well does not return and discharge the working fluid and turns to and increases the energy and integrate the totally closed acidizing construction process, its a kind of oil well does not return and discharges the working fluid and is made up of prepad fluid, acid liquor, turning to the liquid, treating fluid, energizing liquid; wherein the pad fluid consists of 4-8% of high-efficiency oil washing agent and the balance of hot water; the acid solution consists of 10 to 15 percent of hydrochloric acid, 1 to 2.0 percent of ammonium fluoride, 1 to 2 percent of glacial acetic acid, 0.1 to 0.15 percent of citric acid, 0.3 to 0.6 percent of YC-II type imidazoline corrosion inhibitor synthesized indoors and the balance of water; the diversion liquid consists of 5-15% of sodium carboxymethylcellulose and the balance of acid liquor; the treatment liquid consists of 3-12% of sodium hydroxide and the balance of water; the energizing liquid consists of 0.2-0.3% of coconut diethanolamide, 0.3-0.5% of heavy alkylbenzene sulfonate and the balance of water.
Wherein the high-efficiency oil washing agent in the pad fluid is OP-10 and octyl phenol polyoxyethylene ether.
A totally-enclosed construction process for steering and energizing by adopting non-return working fluid is realized by the following steps:
a. squeezing in a pad fluid from a casing gate, wherein the pad fluid consists of 4-8% of a high-efficiency oil washing agent and the balance of hot water, the high-efficiency oil washing agent in the pad fluid is OP-10 and octyl phenol polyoxyethylene ether, determining the use amount of the pad fluid according to the well depth and the oil jacket space, closing the oil pipe gate, squeezing in the pad fluid, determining the use amount of the pad fluid according to the effective thickness of a reservoir, closing the casing gate, and reacting for 1-3 hours;
b. opening the casing gate to be greater than 0.4m3Extruding acid liquor with a large discharge amount per minute, wherein the acid liquor consists of 10-15% of hydrochloric acid, 1-2.0% of ammonium fluoride, 1-2% of glacial acetic acid, 0.1-0.15% of citric acid, 0.3-0.6% of indoor synthesized YC-II type imidazoline corrosion inhibitor and the balance of water, and the using amount of the acid liquor is determined according to the thickness of a high-permeability reservoir stratum, the effective porosity and the reservoir stratum blockage degree;
c. then squeezing into 2-3m of steering fluid3The diversion liquid consists of 5-15% of sodium carboxymethylcellulose and the balance of acid liquor, and the diversion liquid is less than 0.3m3Extruding acid liquor at a small displacement of/min, wherein the acid liquor consists of 10-15% of hydrochloric acid, 1-2.0% of ammonium fluoride, 1-2% of glacial acetic acid, 0.1-0.15% of citric acid, 0.3-0.6% of indoor synthesized YC-II type imidazoline corrosion inhibitor and the balance of water, the using amount of the acid liquor is determined according to the thickness and the effective porosity of a low-permeability reservoir stratum and the blockage degree of the reservoir stratum, injecting clear water, the using amount of the clear water is determined according to the well depth and the inner diameter of a sleeve, closing a sleeve gate, and reacting for 2-3 hours;
d. opening a casing gate, extruding 10-15m treatment liquid and 80-100m energizing liquid with the discharge capacity of 0.3-0.4m/min, wherein the treatment liquid consists of 3-12% of sodium hydroxide and the balance of water, the energizing liquid consists of 0.2-0.3% of coconut diethanolamide, 0.3-0.5% of heavy alkylbenzene sulfonate and the balance of water, closing the casing gate, and reacting for 1-3 days;
e. starting the oil pumping unit and recovering the normal production of the oil well.
The action mechanism of the invention is as follows:
1) the pad fluid is an organic solvent, has better penetration and dispersion effects, and can dissolve crude oil on the surface of a reservoir on one hand and organic scale on the other hand;
2) hydrochloric acid and ammonium fluoride in the acid liquor mainly dissolve carbonate rock and sandstone, and the matrix permeability is improved;
3) the sodium carboxymethylcellulose in the diverting solution can be associated into a giant micelle structure in the acid solution, so that the viscosity of the acid solution is greatly increased, temporary plugging diverting is realized, and acid is uniformly distributed;
4) the sodium hydroxide in the residual acid treatment solution can change the pH value of the residual acid from low to neutral, does not damage an oil pipe and a pump, can reduce the mineralization degree and the conductivity of the residual acid, and does not influence the normal production of an oil-water separation system;
5) the zero-emission totally-enclosed acidification construction process organically combines the time node for opening and closing the production gate of the oil well, the sequence of injecting different working fluids and the well closing reaction time of different working fluids, thereby not only solving the problem of corrosion of residual acid, but also improving the yield increasing effect.
Compared with the prior art, the invention has the following advantages:
1) the pipe column is not moved, and gas and residual liquid are discharged out;
2) the mineralization degree of produced liquid is only 3465mg/L, and the Ph value is 6.4 close to a normal value, so that the production system is not influenced and the damage is caused;
3) the corrosion rate of the produced well rod pipe and the pump is low and is only 0.0083/m2.h；
4) The acidification measure can effectively improve the oil well yield, and the effective rate is over 90 percent.
The specific implementation mode is as follows: the invention is further illustrated by the following examples: a kind of oil well does not return and discharge the working fluid and turns to and increases the energy and integrate the totally closed acidizing construction process, its a kind of oil well does not return and discharges the working fluid and is made up of prepad fluid, acid liquor, turning to the liquid, treating fluid, energizing liquid; wherein the pad fluid consists of 4-8% of high-efficiency oil washing agent and the balance of hot water; the acid solution consists of 10 to 15 percent of hydrochloric acid, 1 to 2.0 percent of ammonium fluoride, 1 to 2 percent of glacial acetic acid, 0.1 to 0.15 percent of citric acid, 0.3 to 0.6 percent of YC-II type imidazoline corrosion inhibitor synthesized indoors and the balance of water; the diversion liquid consists of 5-15% of sodium carboxymethylcellulose and the balance of acid liquor; the treatment liquid consists of 3-12% of sodium hydroxide and the balance of water; the energizing liquid consists of 0.2-0.3% of coconut diethanolamide, 0.3-0.5% of heavy alkylbenzene sulfonate and the balance of water.
Wherein the high-efficiency oil washing agent in the pad fluid is OP-10 and octyl phenol polyoxyethylene ether.
A totally-enclosed construction process for steering and energizing by adopting non-return working fluid is realized by the following steps:
a. squeezing in a pad fluid from a casing gate, wherein the pad fluid consists of 4-8% of a high-efficiency oil washing agent and the balance of hot water, the high-efficiency oil washing agent in the pad fluid is OP-10 and octyl phenol polyoxyethylene ether, determining the use amount of the pad fluid according to the well depth and the oil jacket space, closing the oil pipe gate, squeezing in the pad fluid, determining the use amount of the pad fluid according to the effective thickness of a reservoir, closing the casing gate, and reacting for 1-3 hours;
b. opening the casing gate to be greater than 0.4m3Extruding acid liquor with a large discharge amount per minute, wherein the acid liquor consists of 10-15% of hydrochloric acid, 1-2.0% of ammonium fluoride, 1-2% of glacial acetic acid, 0.1-0.15% of citric acid, 0.3-0.6% of indoor synthesized YC-II type imidazoline corrosion inhibitor and the balance of water, and the using amount of the acid liquor is determined according to the thickness of a high-permeability reservoir stratum, the effective porosity and the reservoir stratum blockage degree;
c. then squeezing into 2-3m of steering fluid3The diversion liquid consists of 5-15% of sodium carboxymethylcellulose and the balance of acid liquor, and the diversion liquid is less than 0.3m3Extruding acid solution with small displacement per minute, wherein the acid solution consists of 10-15% of hydrochloric acid, 1-2.0% of ammonium fluoride, 1-2% of glacial acetic acid, 0.1-0.15% of citric acid, 0.3-0.6% of indoor synthesized YC-II type imidazoline corrosion inhibitor and the balance of water, the using amount of the acid solution is determined according to the thickness and the effective porosity of a low-permeability reservoir stratum and the blockage degree of the reservoir stratum, injecting clear water, the using amount of the clear water is determined according to the well depth and the inner diameter of a sleeve,closing the sleeve gate, and reacting for 2-3 hours;
d. opening a casing gate, extruding 10-15m treatment liquid and 80-100m energizing liquid with the discharge capacity of 0.3-0.4m/min, wherein the treatment liquid consists of 3-12% of sodium hydroxide and the balance of water, the energizing liquid consists of 0.2-0.3% of coconut diethanolamide, 0.3-0.5% of heavy alkylbenzene sulfonate and the balance of water, closing the casing gate, and reacting for 1-3 days;
e. starting the oil pumping unit and recovering the normal production of the oil well.
Example (b): the working fluid comprises pad fluid, acid fluid, steering fluid, treatment fluid and energizing fluid; the pad fluid consists of 2 percent of OP-10, 4 percent of octyl phenol polyoxyethylene ether and the balance of water; the acid solution consists of 12 percent of hydrochloric acid, 1.5 percent of ammonium fluoride, 1 percent of glacial acetic acid, 0.15 percent of citric acid, 0.5 percent of YC-II type imidazoline corrosion inhibitor synthesized indoors and the balance of water; the diversion liquid consists of 10 percent of sodium carboxymethylcellulose and the balance of acid liquor; the treatment liquid consists of 4 percent of sodium hydroxide and the balance of water; the energizing liquid consists of 0.2 percent of coconut diethanolamide, 0.3 percent of heavy alkylbenzene sulfonate and the balance of water; a totally-enclosed construction process for steering and energizing by using non-return working fluid is realized by the following steps:
a. 4m of pad fluid is squeezed from the sleeve gate3(ii) a Closing the oil pipe gate and squeezing in the pad liquid for 8m3Closing the sleeve gate, and reacting for 2 hours;
b. opening the casing gate, 0.6m3Extruding 12m acid liquor at a discharge rate of/min3；
c. 2m of steering fluid is squeezed in3；0.2m3Extruding 12m acid liquor at a discharge rate of/min3Injecting 5m of clean water3Closing the sleeve gate, and reacting for 2 hours;
d. opening the casing gate, 0.4m3Permin displacement 15m of treatment liquid365m of energizer liquid3Closing the sleeve gate, and reacting for 2 days;
e. starting the pumping unit and recovering the normal production of the oil well.
Production liquid parameter change value before and after acidification
| Item | Normal produced liquid | Conventional acidified raffinate | Acidified residual liquid without flowback |
| Conductivity (ms) | 5.62 | 28.2 | 7.36 |
| Degree of mineralization (mg/L) | 2280 | 13728 | 3465 |
| pH value | 7 | 1 | 6.4 |
The data show that after the residual liquid is treated, the parameters of conductivity, mineralization degree, pH value and the like are close to normal values, and no influence is caused on a production system.
Non-return full-closed acidification effect meter
After the measures of the high well 171-1, a better effect is obtained, and the oil is increased by 131.7t in an accumulated way, which shows that the non-return totally-closed acidification process is successful and the measures are effective.
Claims (3)
1. The utility model provides an oil well does not flow back working solution which characterized in that: a non-flowback working fluid for oil well is composed of a pad fluid, an acid fluid, a steering fluid, a treating fluid and an energizing fluid; wherein the pad fluid consists of 4-8% of high-efficiency oil washing agent and the balance of hot water; the acid solution consists of 10 to 15 percent of hydrochloric acid, 1 to 2.0 percent of ammonium fluoride, 1 to 2 percent of glacial acetic acid, 0.1 to 0.15 percent of citric acid, 0.3 to 0.6 percent of YC-II type imidazoline corrosion inhibitor synthesized indoors and the balance of water; the diversion liquid consists of 5-15% of sodium carboxymethylcellulose and the balance of acid liquor; the treatment liquid consists of 3-12% of sodium hydroxide and the balance of water; the energizing liquid consists of 0.2-0.3% of coconut diethanolamide, 0.3-0.5% of heavy alkylbenzene sulfonate and the balance of water.
2. The non-flowback working fluid for an oil well as defined in claim 1, wherein: wherein the high-efficiency oil washing agent in the pad fluid is OP-10 and octyl phenol polyoxyethylene ether.
3. A totally-enclosed construction process for steering and energizing by adopting non-return working fluid is realized by the following steps:
a. squeezing in a pad fluid from a casing gate, wherein the pad fluid consists of 4-8% of a high-efficiency oil washing agent and the balance of hot water, the high-efficiency oil washing agent in the pad fluid is OP-10 and octyl phenol polyoxyethylene ether, determining the use amount of the pad fluid according to the well depth and the oil jacket space, closing the oil pipe gate, squeezing in the pad fluid, determining the use amount of the pad fluid according to the effective thickness of a reservoir, closing the casing gate, and reacting for 1-3 hours;
b. opening the casing gate to be greater than 0.4m3Extruding acid liquor with a large discharge amount per minute, wherein the acid liquor consists of 10-15% of hydrochloric acid, 1-2.0% of ammonium fluoride, 1-2% of glacial acetic acid, 0.1-0.15% of citric acid, 0.3-0.6% of indoor synthesized YC-II type imidazoline corrosion inhibitor and the balance of water, and the using amount of the acid liquor is determined according to the thickness of a high-permeability reservoir stratum, the effective porosity and the reservoir stratum blockage degree;
c. then squeezing into 2-3m of steering fluid3The diversion liquid consists of 5-15% of sodium carboxymethylcellulose and the balance of acid liquor, and the diversion liquid is less than 0.3m3Extruding acid liquor at a small displacement of/min, wherein the acid liquor consists of 10-15% of hydrochloric acid, 1-2.0% of ammonium fluoride, 1-2% of glacial acetic acid, 0.1-0.15% of citric acid, 0.3-0.6% of indoor synthesized YC-II type imidazoline corrosion inhibitor and the balance of water, the using amount of the acid liquor is determined according to the thickness and the effective porosity of a low-permeability reservoir stratum and the blockage degree of the reservoir stratum, injecting clear water, the using amount of the clear water is determined according to the well depth and the inner diameter of a sleeve, closing a sleeve gate, and reacting for 2-3 hours;
d. opening a casing gate, extruding 10-15m treatment liquid and 80-100m energizing liquid with the discharge capacity of 0.3-0.4m/min, wherein the treatment liquid consists of 3-12% of sodium hydroxide and the balance of water, the energizing liquid consists of 0.2-0.3% of coconut diethanolamide, 0.3-0.5% of heavy alkylbenzene sulfonate and the balance of water, closing the casing gate, and reacting for 1-3 days;
e. starting the oil pumping unit and recovering the normal production of the oil well.
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| CN201910317348.6A CN110056334B (en) | 2019-04-19 | 2019-04-19 | Oil well non-flowback working fluid and steering and energizing integrated totally-enclosed acidizing construction process |
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| CN201910317348.6A CN110056334B (en) | 2019-04-19 | 2019-04-19 | Oil well non-flowback working fluid and steering and energizing integrated totally-enclosed acidizing construction process |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113464095B (en) * | 2020-03-30 | 2023-02-07 | 中国石油天然气股份有限公司 | Acidizing and blockage removing method for sandstone high-temperature and high-pressure gas well shaft |
| CN112523737B (en) * | 2020-10-23 | 2022-09-20 | 西安石油大油气科技有限公司 | Oil well acidification process and device for improving oil and gas well yield |
| CN115700268A (en) * | 2021-07-16 | 2023-02-07 | 大庆油田有限责任公司 | Acidification chemical diversion agent and acidification chemical diversion process |
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