CN110671085B - Horizontal well acidizing process based on composite acid system - Google Patents
Horizontal well acidizing process based on composite acid system Download PDFInfo
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- CN110671085B CN110671085B CN201911134401.5A CN201911134401A CN110671085B CN 110671085 B CN110671085 B CN 110671085B CN 201911134401 A CN201911134401 A CN 201911134401A CN 110671085 B CN110671085 B CN 110671085B
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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
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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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
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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
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
Abstract
The invention discloses a horizontal well acidizing process based on a composite acid system, which comprises the following steps of: s1, completing the well, and putting a production string; s2, putting a continuous oil pipe into the production pipe column to the position of the reservoir to be stimulated; s3, injecting acid liquor into the coiled tubing, and injecting treatment fluid into an annulus between the coiled tubing and the production string, so that the acid liquor and the treatment fluid are mixed at the reservoir stratum to be stimulated to form acidizing fluid. The invention aims to provide a horizontal well acidizing process based on a composite acid system, which aims to solve the problem that horizontal well acidizing difficulty is high due to weak non-homogeneity in the prior art and achieve the purpose of improving the horizontal well acidizing process.
Description
Technical Field
The invention relates to the field of acidification yield increase, in particular to a horizontal well acidification process based on a composite acid liquor system.
Background
In the acidizing construction, because the reaction speed of acid rocks is high and the penetration distance of acid is short, the damage to the stratum in the near wellbore zone can be eliminated. Therefore, the penetration distance of the acid liquid can be properly increased by increasing the concentration of the acid. The effective period of the increase in production by acidification is short, and after the sandstone is acidified, the clay particles or other particles are easy to migrate to cause the blockage of oil flow channels, so that the initial yield of the acidification is increased quickly, and the later yield is reduced quickly. In carbonate reservoirs, the acid system needs to be considered comprehensively when acidizing the reservoir because the acid reacts with the carbonate too quickly, so that fractures far from the bottom of the well are not easily acidized. For a reservoir with weak heterogeneity, a gelled acid liquid system is generally used for acidification in the prior art, and the characteristics of small frictional resistance of gelled acid are utilized to achieve the effects of improving the acidification discharge capacity and reducing the performance requirements on ground equipment. The existing gelled acid system has good fluid loss reducing effect, can delay the reaction speed of acid rocks and increase the penetration distance of active acid, and has been widely applied at home and abroad; but the problem of damage to the formation by gelled acid formulations is gradually being valued by the industry: the damage of the high molecular polymer in the gelled acid formula to the stratum often greatly affects the construction effect of acidification, and the construction effect is directly affected. Particularly in reservoirs with weak heterogeneity, the damage has strong continuity, so that the influence on the yield is more easily reflected on the macro scale.
For a horizontal well, the traditional full-well-section general acid distribution process can cause acid liquor to be layered and accumulated on a lower well wall in a horizontal section, and is very unfavorable for overall acidification of a reservoir stratum. In the prior art, a horizontal well is generally acidized section by section in a mechanical layering mode, but the horizontal well which is completed by a liner pipe/sieve pipe and completed by gravel filling is not suitable for packer steering acid distribution when being acidized, because the packer used in the current domestic horizontal well measures is not matched, in addition, the process has strict requirements on well cementation quality, and an external channeling groove cannot be sealed and layered. While the conventional coiled tubing acid distribution technique is performed during completion, due to friction between the coiled tubing and the completion string, when the coiled tubing is subjected to frictional resistance to form a two-dimensional sinusoidal shape, bending deformation of the coiled tubing begins to occur. The bending of the coiled tubing increases the frictional resistance, forcing the coiled tubing into a helical, spring-like, or twist-like shape. The frictional resistance generated in this case is so great that the coiled tubing cannot be transported further downhole (locked out). In order to avoid the situation, a double-hydraulic continuous oil pipe tractor is generally used on site for matching, so that the cost is obviously increased, and the efficiency is reduced.
Disclosure of Invention
The invention aims to provide a horizontal well acidizing process based on a composite acid system, which aims to solve the problem that horizontal well acidizing difficulty is high due to weak non-homogeneity in the prior art and achieve the purpose of improving the horizontal well acidizing process.
The invention is realized by the following technical scheme:
the horizontal well acidizing process based on the composite acid system comprises the following steps:
s1, completing the well, and putting a production string;
s2, putting a continuous oil pipe into the production pipe column to the position of the reservoir to be stimulated;
s3, injecting acid liquor into the coiled tubing, and injecting treatment fluid into an annulus between the coiled tubing and the production string, so that the acid liquor and the treatment fluid are mixed at the reservoir stratum to be stimulated to form acidizing fluid.
Aiming at the problem of high difficulty in horizontal well acidification in the prior art, the invention provides a horizontal well acidification process based on a composite acid system, which is different from the traditional continuous oil pipe acidification in a well completion stage and in a well completion pipe column. Compared with a well completion pipe column, the inner wall of the production pipe column is smooth and is not blocked too much, so that the hanging points of the coiled tubing in the production pipe column are fewer, the coiled tubing can be put in place more conveniently, the use of a hydraulic tractor is reduced, and the frequency of on-site connection, debugging and use of the hydraulic tractor is obviously reduced, so that the efficiency of acid injection operation is improved, and the difficulty of acidification of the horizontal well through the coiled tubing is reduced. In addition, because the method is operated in the production string, the method can be realized not only in the drilling and completion stage of the oil and gas well, but also in the well repair process of the production well, and only the lifting device in the well needs to be taken out, so that the method has strong universality and wide operation window, and can obviously reduce the engineering cost in the later adjustment of the oil and gas field and the secondary production increasing process of the old well. In addition, inject into acidizing fluid in the coiled tubing in this application, pour into the treatment fluid into in the annular space between coiled tubing and the production string, in the well, acidizing fluid from inside to outside blowout, utilize the pump pressure of pouring into rather than the hydrostatic column pressure that bears at the shaft bottom and treatment fluid to carry out intensive mixing, again together get into the stratum, compare in the mode that all components mix on ground among the traditional art, can avoid reacting in advance or phenomenon such as layering, realized the bottom of the well promptly preparing and use.
Further, the acid liquor comprises a gelling agent, a thickening agent, a corrosion inhibitor, a cleanup additive, an iron ion stabilizer and hydrochloric acid;
the treatment fluid comprises a foaming agent, a foam stabilizer and calcium carbonate;
the acid liquor and the treatment liquid are mixed to form an acidizing fluid, and the acidizing fluid comprises the following components in percentage by mass: 0.8-1.2% of gelling agent, 0.3-0.5% of thickening agent, 4-6% of corrosion inhibitor, 1-2% of cleanup additive, 0.5-2% of iron ion stabilizer, 3-5% of foaming agent, 0.2-0.3% of foam stabilizer, 1-1.5% of calcium carbonate, 10-25% of hydrochloric acid and the balance of water.
In the scheme, the treatment fluid comprises the components of a gelling agent, a thickening agent, a corrosion inhibitor, an iron ion stabilizer and the like used in the existing gelled acid system, and in addition, the treatment fluid comprises the components of the gelling agent, the thickening agent, the corrosion inhibitor, the iron ion stabilizer and the like used in the existing gelled acid systemThe treatment fluid comprises a foaming agent, a foam stabilizer and calcium carbonate, wherein the foaming agent is used for foaming in the whole acid liquor system, and the foam stabilizer is used for keeping bubbles stable. The essence of the scheme is the compounding of two acidification systems of gelled acid and foamed acid, and the core of the scheme is that the preparation is practical and practical underground. In the scheme, after the acid liquor and the treatment fluid are mixed in the well, the calcium carbonate and the acid liquor are reacted to generate carbon dioxide, and carbon dioxide gas is mixed with foam generated by the foaming agent, so that the foam generation can be promoted through the carbon dioxide, and the foam generated by the foaming agent is more stable. The acidizing fluid enters the reservoir during the acidizing process, and the acidizing fluid has the following advantages in the reservoir with strong heterogeneity: (1) the foam has selectivity on permeability, has stronger plugging effect on a high-permeability layer and weaker plugging effect on a low-permeability layer, and more acid liquor systems with the gelling agents enter low-permeability pores by plugging high-permeability pores through the foam; after the gelling agent enters the low-permeability pore gaps, because the filtration loss of the gelling agent is low, the water locking phenomenon cannot occur in the low-permeability pore gaps, the slow reaction speed of the acid liquid in the low-permeability pore gaps can be ensured, and the penetration distance of the acid liquid can be increased. Therefore, compared with the technology that the traditional gelled acid cleans the hypertonic reservoir layer in a large scale and causes acid liquor to flow into the hypertonic reservoir layer so that the hypotonic reservoir layer is difficult to improve, the yield increasing effect on the hypotonic region of the reservoir layer is obviously improved. For oil and gas wells, a reservoir hypertonic region of the oil and gas wells has not much production increase value, a hypotonic region needs to be increased in yield, and the scheme perfectly realizes the basic idea of acidification production increase. (2) The foam is selective to the oil-water layer, and because the interfacial tension of the oil is low, the foam entering the water is relatively stable compared with the foam entering the oil, and the foam preferentially enters the oil layer; foam gets into the oil reservoir along with gelling acid liquid in this application, realizes the preferential acidizing to the oil reservoir, avoids the acidizing fluid extravagant in the higher region of moisture content, not only can improve the utilization ratio to whole acidizing fluid system, can also slow down the water content of water-cut time, reduction later stage output even. (3) Utilize the interpolation of calcium carbonate in this scheme for foam and carbon dioxide intensive mixing, unstable foam receives carbon dioxide gas invasion and accompany high-speed stirring in the ground mixing process of earlier stage, can be broken fast, makes remainingThe foam performance and the compression resistance are stable, and the problem that the traditional foam acid system is greatly destroyed by the pressure of the overlying strata and the confining pressure after entering the stratum is solved. (4) After foam is added into the gel system, the foam is attached to the surface, and the foam is positioned close to the rock stratum after acid liquid is injected into the stratum, so that H in the foam+The acid liquor of the gelling system is basically higher in apparent viscosity only by being spread to the surface of the rock through the external phase, and after foams generated by the foaming agent and bubbles generated by carbon dioxide are added, the apparent viscosity is higher, the interface diffusion speed can be obviously reduced, so that the corrosion reaction rate of the scheme is lower than that of the traditional gelling acid liquor phase acid liquor system, the purpose of slowing acidification is achieved, and a deeper corrosion channel is formed. (5) The viscosity of residual acid of a traditional gelled acid system is low, generally ranges from 10 to 15mPa · s, and solid-phase particles in a stratum fracture after reaction can be carried easily, but due to limited energy, the flowback effect is obvious, and the residual acid is one of the reasons for secondary damage of gelled acid pressure to the stratum. In this scheme, the carbon dioxide that calcium carbonate produced when ground stirring mixes, must mix in acidizing fluid in a large number, back in the injection well, can appear gradually under the high temperature effect of stratum, and gas expansion can be for the residual acid flowback provides the energy, makes the residual acid flowback more thoroughly, consequently this application utilizes the expansion of carbon dioxide in the pit can mutually support with the raffinate that carries the solid phase particle, is showing to improve the flowback effect, has very obvious advantage in the aspect of preventing the secondary and deposiing.
Further, the injection pump pressure of the treatment liquid is higher than that of the acid liquid. The acid liquor is sprayed out and enters the treatment fluid, and the treatment fluid is squeezed and injected into the treatment fluid due to the high pumping pressure of the treatment fluid, and is scattered and dispersed by the treatment fluid with high pressure instantly, so that the acid liquor and the treatment fluid are mixed fully, and foam generated instantly is ensured to enter a stratum.
Furthermore, a plurality of nozzles are arranged at the bottom of the continuous oil pipe, and the acid liquor is sprayed out of the nozzles.
Further, the gelling agent is a copolymer formed by methacryloyloxyethyl trimethyl ammonium chloride and acrylamide.
Further, the thickening agent is a copolymer formed by anionic monomers, namely 2-acrylamide-2-methylpropanesulfonic acid and acrylamide.
Further, the corrosion inhibitor is a Mannich base quaternary ammonium salt.
Further, the concentration of the hydrochloric acid is 25-28%.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the horizontal well acidizing process based on the composite acid system, the coiled tubing is put into the production string, compared with a well completion string, the inner wall of the production string is smooth and is not blocked too much, so that the hanging points of the coiled tubing in the production string are fewer, the coiled tubing can be put in place more conveniently, the use of a hydraulic tractor is reduced, the frequency of field connection, debugging and use of the hydraulic tractor is obviously reduced, the efficiency of acid injection operation is improved, and the acidizing difficulty of the horizontal well through the coiled tubing is reduced.
2. The horizontal well acidizing process based on the composite acid liquid system can be realized in the drilling and completion stage of the oil and gas well, can be carried out in the well repairing process of the production well, and only needs to take out the lifting device in the well, so that the method has strong universality and wide operation window, and can obviously reduce the engineering cost in the later-stage adjustment of the oil and gas field and the secondary yield increasing process of the old well.
3. According to the horizontal well acidizing process based on the composite acid liquid system, acid liquid is injected into the continuous oil pipe, the treatment liquid is injected into the annular space between the continuous oil pipe and the production pipe column, the acid liquid is sprayed out from inside to outside in the horizontal well, the injected pump pressure and the hydrostatic column pressure borne by the continuous oil pipe at the bottom of the well are fully mixed with the treatment liquid, and then the mixed liquid enters the stratum together.
4. The horizontal well acidizing process based on the composite acid system realizes the basic idea of acidizing and increasing the yield, and remarkably improves the yield increasing effect on the hypotonic region of the reservoir compared with the technology that the hypotonic reservoir is difficult to improve due to the fact that the traditional gelled acid washes the hypertonic reservoir on a large scale and the acid floods the hypertonic reservoir.
5. According to the horizontal well acidizing process based on the composite acid liquid system, foam enters the oil layer along with gelled acid liquid, preferential acidization on the oil layer is achieved, acid liquid is prevented from being wasted in a region with high water content, the utilization rate of the whole acid liquid system can be improved, the water breakthrough time can be reduced, and even the water content output in the later period is reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1:
the horizontal well acidizing process based on the composite acid system comprises the following steps: s1, completing the well, and putting a production string; s2, putting a continuous oil pipe into the production pipe column to the position of the reservoir to be stimulated; s3, injecting acid liquor into the coiled tubing, and injecting treatment fluid into an annulus between the coiled tubing and the production string, so that the acid liquor and the treatment fluid are mixed at the reservoir stratum to be stimulated to form acidizing fluid.
Wherein the acid liquor comprises a gelling agent, a thickening agent, a corrosion inhibitor, a cleanup additive, an iron ion stabilizer and hydrochloric acid; the treatment fluid comprises a foaming agent, a foam stabilizer and calcium carbonate; the acid liquor and the treatment liquid are mixed to form an acidizing fluid, and the acidizing fluid comprises the following components in percentage by mass: 1% of gelling agent, 0.4% of thickening agent, 5% of corrosion inhibitor, 1.5% of cleanup additive, 1% of iron ion stabilizer, 4% of foaming agent, 0.3% of foam stabilizer, 1% of calcium carbonate, 15% of hydrochloric acid and the balance of water.
Preferably, the injection pump pressure of the treatment liquid is higher than the injection pump pressure of the acid liquid.
Preferably, a plurality of nozzles are arranged at the bottom of the continuous oil pipe, and the acid liquor is sprayed out of the nozzles.
Example 2:
the difference between this example and example 1 is that the ratio of the acidified liquid after mixing is different: 0.8% of gelling agent, 0.4% of thickening agent, 5% of corrosion inhibitor, 1.5% of cleanup additive, 1% of iron ion stabilizer, 3% of foaming agent, 0.2% of foam stabilizer, 1% of calcium carbonate, 15% of hydrochloric acid and the balance of water.
Example 3:
the difference between this example and example 1 is that the ratio of the acidified liquid after mixing is different: 1.2% of gelling agent, 0.3-0.5% of thickening agent, 5% of corrosion inhibitor, 1.5% of cleanup additive, 1% of iron ion stabilizer, 5% of foaming agent, 0.2% of foam stabilizer, 1% of calcium carbonate, 15% of hydrochloric acid and the balance of water.
Comparative example 1:
the difference between this comparative example and example 1 is that the ratio of the acidified liquid after mixing is different: 1% of gelling agent, 0.4% of thickening agent, 5% of corrosion inhibitor, 1.5% of cleanup additive, 1% of iron ion stabilizer, 2% of foaming agent, 0.3% of foam stabilizer, 1% of calcium carbonate, 15% of hydrochloric acid and the balance of water.
Comparative example 2:
the difference between this comparative example and example 1 is that the ratio of the acidified liquid after mixing is different: 1% of gelling agent, 0.4% of thickening agent, 5% of corrosion inhibitor, 1.5% of cleanup additive, 1% of iron ion stabilizer, 0.5% of foaming agent, 0.3% of foam stabilizer, 1% of calcium carbonate, 15% of hydrochloric acid and the balance of water.
Comparative example 3:
the difference between this comparative example and example 1 is that the ratio of the acidified liquid after mixing is different: 1% of gelling agent, 0.4% of thickening agent, 5% of corrosion inhibitor, 1.5% of cleanup additive, 1% of iron ion stabilizer, 6% of foaming agent, 0.3% of foam stabilizer, 1% of calcium carbonate, 15% of hydrochloric acid and the balance of water.
Comparative example 4:
the difference between this comparative example and example 1 is that the ratio of the acidified liquid after mixing is different: 1% of gelling agent, 0.4% of thickening agent, 5% of corrosion inhibitor, 1.5% of cleanup additive, 1% of iron ion stabilizer, 8% of foaming agent, 0.3% of foam stabilizer, 1% of calcium carbonate, 15% of hydrochloric acid and the balance of water.
Comparative example 5:
the difference between this comparative example and example 1 is that the ratio of the acidified liquid after mixing is different: 2% of gelling agent, 0.4% of thickening agent, 5% of corrosion inhibitor, 1.5% of cleanup additive, 1% of iron ion stabilizer, 8% of foaming agent, 0.3% of foam stabilizer, 1% of calcium carbonate, 15% of hydrochloric acid and the balance of water.
In the above examples and comparative examples, the materials of the components are the same, and the preparation process parameters and mixing manner are the same. After the configuration is finished, the results shown in the following table are obtained through performance measurement and core simulation experiments of coring in the same batch:
through the comparison, when the value of the gelling agent is unchanged, the viscosity of an acid liquid system is reduced, the flowback sand carrying capacity is weakened, the yield increasing effect is weakened, and the depth of an erosion channel is shallow (because the time for the residual liquid to be subjected to liquid production is increased) along with the reduction of the using amount of the foaming agent; when the value of the gelling agent is unchanged, the viscosity of an acid liquid system is increased and the flowback sand carrying capacity is improved along with the increase of the using amount of the foaming agent, but the yield increasing effect is obviously weakened and the depth of an erosion channel is reduced as the excessive foam blocks the path of the gelling acid liquid. When the using amount of the gelling agent and the foaming agent is increased in the same proportion, the viscosity of the whole system is high, the flowback sand carrying capacity can be enhanced, but the yield increasing effect is not ideal at all because the gelling agent secondarily pollutes the rock core and the depth of an erosion channel is also shallow. Therefore, the proportion of gelling agent and foaming agent in the acid system of the present application is the optimum in the interval given in the present application.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The horizontal well acidizing process based on the composite acid system is characterized by comprising the following steps of:
s1, completing the well, and putting a production string;
s2, putting a continuous oil pipe into the production pipe column to the position of the reservoir to be stimulated;
s3, injecting acid liquor into the coiled tubing, and injecting treatment fluid into an annulus between the coiled tubing and the production string, so that the acid liquor and the treatment fluid are mixed at the reservoir stratum to be subjected to yield increase to form acidizing fluid;
the acid liquor comprises a gelling agent, a thickening agent, a corrosion inhibitor, a cleanup additive, an iron ion stabilizer and hydrochloric acid;
the treatment fluid comprises a foaming agent, a foam stabilizer and calcium carbonate;
the acid liquor and the treatment liquid are mixed to form an acidizing fluid, and the acidizing fluid comprises the following components in percentage by mass: 0.8-1.2% of gelling agent, 0.3-0.5% of thickening agent, 4-6% of corrosion inhibitor, 1-2% of cleanup additive, 0.5-2% of iron ion stabilizer, 3-5% of foaming agent, 0.2-0.3% of foam stabilizer, 1-1.5% of calcium carbonate, 10-25% of hydrochloric acid and the balance of water.
2. The horizontal well acidizing process based on a composite acid system as claimed in claim 1 wherein the injection pump pressure of the treatment fluid is higher than the injection pump pressure of the acid.
3. The horizontal well acidizing process based on a composite acid system as claimed in claim 1, wherein a plurality of nozzles are arranged at the bottom of the coiled tubing, and the acid is sprayed out of the nozzles.
4. The horizontal well acidizing process based on a composite acid liquid system according to claim 1, wherein the gelling agent is a copolymer formed by methacryloyloxyethyl trimethyl ammonium chloride and acrylamide.
5. The horizontal well acidizing process based on a composite acid liquid system is characterized in that the thickening agent is a copolymer formed by anionic monomers, namely 2-acrylamide-2-methylpropanesulfonic acid and acrylamide.
6. The horizontal well acidizing process based on a composite acid system of claim 1 wherein the corrosion inhibitor is a Mannich base quaternary ammonium salt.
7. The horizontal well acidizing process based on a composite acid system as claimed in claim 1 wherein the concentration of the hydrochloric acid is between 25% and 28%.
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| CN112031728A (en) * | 2020-09-04 | 2020-12-04 | 中国石油天然气股份有限公司 | Composite acid fracturing method for horizontal well |
| CN112375558A (en) * | 2020-11-04 | 2021-02-19 | 中国石油集团渤海钻探工程有限公司 | Working fluid system for pickling sandstone geothermal well |
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| US8653011B2 (en) * | 2009-11-12 | 2014-02-18 | Schlumberger Technology Corporation | Gelled hydrocarbon system and method with dual-function viscosifier/breaker additive |
| CN101718184B (en) * | 2009-12-15 | 2013-10-30 | 中国石油大学(华东) | Foamed acid washing technological method for horizontal well |
| CN102536166B (en) * | 2012-02-14 | 2015-01-21 | 中国石油天然气股份有限公司 | Method for deep treatment of oil layer through self-generation foam acidification |
| CN108468537A (en) * | 2017-02-23 | 2018-08-31 | 克拉玛依市建辉油田技术服务有限公司 | Chemical energization realizes underground viscous crude visbreaking mining novel technology |
| CN107013196A (en) * | 2017-06-09 | 2017-08-04 | 中国石油化工股份有限公司 | A kind of method of horizontal well nitrogen foam homogeneous acidification |
| CN109083621A (en) * | 2018-07-28 | 2018-12-25 | 中国石油天然气股份有限公司 | A kind of horizontal well coiled tubing composite blockage relieving method |
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