CN114015423A - Mixed drilling mud and method for improving underground compact oil and gas reservoir - Google Patents

Mixed drilling mud and method for improving underground compact oil and gas reservoir Download PDF

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CN114015423A
CN114015423A CN202111319529.6A CN202111319529A CN114015423A CN 114015423 A CN114015423 A CN 114015423A CN 202111319529 A CN202111319529 A CN 202111319529A CN 114015423 A CN114015423 A CN 114015423A
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mud
drilling mud
underground
tetrahydrofuran
reservoir
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曹琰
金之钧
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Peking University
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Peking University
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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
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
    • 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
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
    • C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
    • 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
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • C09K8/22—Synthetic organic compounds
    • 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
    • C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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  • Mining & Mineral Resources (AREA)
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Abstract

The invention relates to the technical field of mining, and provides a method for improving a mixed drilling mud and an underground compact oil and gas reservoir. The mixed drilling mud provided by the invention comprises blowout prevention mud, tetrahydrofuran and an auxiliary component, wherein the auxiliary component is acetone or carbon disulfide. The slurry is used for carrying an organic solvent, so that the pore structure of the underground compact sandstone is changed in a targeted manner, and a road is dredged for oil and gas migration; wherein, the acetone has smaller diameter, is easier to enter the micropores, is suitable for the reconstruction of a compact natural gas layer, has stronger carbon disulfide extraction capability, and is suitable for the reconstruction of an underground compact petroleum layer.

Description

Mixed drilling mud and method for improving underground compact oil and gas reservoir
Technical Field
The invention relates to the technical field of mining, in particular to a method for improving a mixed drilling mud and an underground compact oil and gas reservoir.
Background
Compact oil gas is a new field in the current petroleum industry, is an unconventional resource which is very important globally, and is an important force for replacing conventional oil gas energy and supporting oil gas revolution. In order to guarantee national energy safety, the development of petroleum and natural gas in China gradually moves from conventional oil gas to unconventional oil gas. The dense petroleum and natural gas as an important component of oil and gas resources in China is a main target resource for increasing, storing and producing oil and gas in China in the future. The permeability of the compact oil and gas reservoir is low, the porosity is small, and the pore structure is complex, so that the current production efficiency of compact oil and gas is low, the single well yield of the compact oil reservoir is low, and the economic benefit is poor.
The technology for modifying the reservoir in the drilling process is one of the main means for developing the compact oil gas, and the key for developing the compact oil gas is to greatly improve the modifying effect of the oil gas reservoir. At present, the function of mud in the compact oil and gas drilling process is single, only basic functions such as well blowout prevention and drill bit cooling are achieved, and a compact rock reservoir containing oil and gas cannot be transformed.
Disclosure of Invention
In view of the above, the present invention provides a method for modifying a mixed drilling mud and a dense underground hydrocarbon reservoir. The mixed drilling mud provided by the invention can be used for flushing underground compact sandstone, changing the pore structure of the underground compact sandstone and dredging an oil-gas transportation channel.
In order to achieve the above object, the present invention provides the following technical solutions:
a mixed drilling mud comprises blowout prevention mud, tetrahydrofuran and an auxiliary component, wherein the auxiliary component is acetone or carbon disulfide.
Preferably, when the auxiliary component is acetone, the mass ratio of the blowout prevention slurry to the acetone to the tetrahydrofuran is (85-96): (3-7): 1-8.
Preferably, when the auxiliary component is carbon disulfide, the mass ratio of the blowout prevention slurry to the carbon disulfide to the tetrahydrofuran is (78-92): (5-10): 3-12.
The invention also provides a method for transforming the underground compact oil and gas reservoir, which comprises the following steps:
the mixed drilling mud prepared by the scheme is injected into an underground compact oil and gas reservoir for reservoir reconstruction.
Preferably, the reservoir modification method specifically comprises: drilling a stratum by using a drill bit, wherein the drill bit is connected with a drill rod, when an underground compact oil and gas reservoir is met, mixed drilling mud is injected by using a high-pressure pump through a mud injection channel of the drill rod, is jetted out from the drill bit, washes the compact oil and gas reservoir and returns to the ground through a mud underground return channel; when the underground compact oil and gas reservoir is a compact oil layer, the components of the mixed drilling mud comprise blowout prevention mud, tetrahydrofuran and carbon disulfide; when the underground compact oil and gas reservoir is a compact natural gas reservoir, the components of the mixed drilling mud comprise blowout prevention mud, tetrahydrofuran and acetone.
The invention provides mixed drilling mud, which comprises blowout prevention mud, tetrahydrofuran and an auxiliary component, wherein the auxiliary component is acetone or carbon disulfide. The slurry is used for carrying an organic solvent, the pore structure of the underground compact sandstone is changed in a targeted manner, and the acetone and the carbon disulfide can wash micropores or mesopores of the underground compact sandstone, so that a road is dredged for oil and gas migration; the invention adds tetrahydrofuran into the mixed drilling mud, the tetrahydrofuran can dissolve a large amount of asphaltene by flushing the compact sandstone, and the pipeline is dredged by transferring the underground natural gas or oil to a wellhead.
The invention also provides a method for transforming the underground compact oil and gas reservoir, in particular to a method for injecting the mixed drilling mud into the underground compact oil and gas reservoir to transform the reservoir. The micropores (< 2nm) of the compact sandstone have higher specific surface area and can absorb a large amount of natural gas, while the acetone has smaller diameter and can enter the micropores more easily, and the acetone is used for flushing to release a large amount of micropores in the compact sandstone and move natural gas in underground micropores to a wellhead dredging road, so that when the compact oil-gas reservoir is a natural gas reservoir, the auxiliary component in the mixed drilling mud is preferably acetone. The mesopores (2-50nm) of the compact sandstone have larger pore volume and are good storage places of petroleum, the extraction capacity of the carbon disulfide is relatively strong, the ion crosslinking in organic matters can be damaged, the large-particle organic matters in the mesopores can be dissolved by the strong extraction capacity of the carbon disulfide, part of the organic matters in the micropores are extracted, and the original micropores are expanded into mesopores, so that the mesopores in a large amount of the compact sandstone can be released by flushing the carbon disulfide, the petroleum in the underground mesopores is transported to a well head to dredge a road, and when the compact oil-gas reservoir is a petroleum reservoir, the auxiliary component in the mixed drilling mud is preferably the carbon disulfide. The method can realize the reconstruction of the underground compact oil and gas reservoir and dredge the oil and gas transportation channel, thereby realizing the purpose of improving the oil and gas exploitation rate.
Drawings
FIG. 1 is a side view of an apparatus for use in a method of reservoir modification provided by the present invention;
FIG. 2 is a top plan view of an apparatus for use in a method of reservoir modification provided by the present invention;
in FIGS. 1 to 2: 1-a mud matching system, 2-a drill rod, 3-a drill bit, 4-a mud underground injection channel, 5-a mud underground return channel, 6-a stratum rock mass and 7-a high-pressure pump;
fig. 3 is a flow chart of the operation of the reservoir reforming method provided by the present invention.
Detailed Description
The invention provides mixed drilling mud, which comprises blowout prevention mud, tetrahydrofuran and an auxiliary component, wherein the auxiliary component is acetone or carbon disulfide.
In the invention, when the auxiliary component is acetone, the mass ratio of the blowout prevention slurry to the acetone to the tetrahydrofuran is preferably (85-96): 3-7): 1-8, and more preferably (88-94): 4-5): 2-7.
In the invention, when the auxiliary component is carbon disulfide, the mass ratio of the blowout prevention slurry to the carbon disulfide to tetrahydrofuran is preferably (78-92): 5-10): 3-12, and more preferably (82-90): 6-8): 4-10.
The invention has no special requirement on the blowout prevention mud, and the common blowout prevention drilling mud for drilling in the area, which is well known by the technical personnel in the field, can be adopted; in a particular embodiment of the invention, the main components of the blowout prevention drilling mud comprise: water, an alkalinity regulator, a filtrate reducer, a flocculating agent, a coating agent, an inhibitor, a lubricant, an anti-collapse agent, a flow pattern regulator, an oil conservation material, a leakage plugging material, soil powder and a weighting material, wherein the alkalinity regulator is preferably a sodium hydroxide solution with the mass fraction of 30%; the filtrate reducer is preferably a starch filtrate reducer, a cellulose filtrate reducer or a humic acid filtrate reducer; the starch fluid loss additive is preferably carboxymethyl starch (CMS), hydroxypropyl starch (HPS) or modified temperature resistant starch (DFD); the cellulose fluid loss additive is preferably sodium carboxymethyl cellulose (CMC), polyaluminum chloride (PAC) and polyanionic cellulose (Drispac); the humic acid filtrate reducer is preferably lignite, sodium nitrohumate, chromium humic acid, sulfonated lignite or potassium humate; the flocculating agent is preferably polysaccharide or starch containing phosphate groups; the coating agent is preferably cationic polyacrylamide; the inhibitor is preferably an organic amine inhibitor; the lubricant is preferably polyethylene polymer lubricating oil or oleate; the anti-collapse agent is preferably modified asphalt (SAS); the flow pattern modifier is preferably xanthan gum, and the oil retention material is preferably calcium carbonate crumb particles; the leakage blocking material is preferably composed of single-liquid polyurethane and an additive; the soil powder is preferably the soil powder with the particle size of more than 0.075mm and the content of particles of no more than 50% of the total mass; the weighting material is preferably one or more of barite, hematite, galena and quartz.
The invention has no special requirements on the types and components of the blowout prevention mud, and the common blowout prevention mud commonly used by the technical personnel in the field for drilling in the area is adopted; in the specific embodiment of the invention, the blowout prevention mud function comprises conveying rock debris to the surface, preventing well control problems, maintaining the stability of a shaft and the like, and the invention preferably selects proper blowout prevention mud according to specific needs and mixes the blowout prevention mud with tetrahydrofuran and acetone (or carbon disulfide); according to the invention, the components of the common blowout prevention mud in the original drilling area are not required to be changed, tetrahydrofuran and acetone (or carbon disulfide) are directly added into the blowout prevention mud, and the pore structure of the underground rock stratum is changed in a targeted manner through the solvent carried by the mud, so that high-yield oil gas is obtained.
The invention has no special requirements on the preparation method of the mixed drilling mud, and the blowout prevention mud, the tetrahydrofuran and the auxiliary components are uniformly mixed according to the proportion.
The invention also provides a method for transforming the underground compact oil and gas reservoir, which comprises the following steps:
and injecting the mixed drilling mud into an underground compact oil and gas reservoir for reservoir transformation.
In the present invention, the reservoir modification method specifically includes: drilling a stratum by using a drill bit, wherein the drill bit is connected with a drill rod, when an underground compact oil and gas reservoir is met, mixed drilling mud is injected by using a high-pressure pump through a mud injection channel of the drill rod, is jetted out from the drill bit, washes the compact oil and gas reservoir and returns to the ground through a mud underground return channel; when the underground compact oil and gas reservoir is a compact oil layer, the components of the mixed drilling mud comprise blowout prevention mud, tetrahydrofuran and carbon disulfide; when the underground compact oil and gas reservoir is a compact natural gas reservoir, the components of the mixed drilling mud comprise blowout prevention mud, tetrahydrofuran and acetone.
In the specific embodiment of the invention, when the drill bit drills a stratum, the anti-blowout mud is preferably injected firstly, the anti-blowout mud is sprayed from the drill bit and wraps rock fragments to return to the ground through the mud underground return channel so as to clean and cool the drill bit at the bottom of a well, when the drill bit drills a compact oil and gas reservoir, the mixed drilling mud is used, after entering the oil and gas reservoir, the mixed drilling mud flushes the pore structure of the reservoir, releases micropores or mesopores of the reservoir, dissolves the asphaltene in the reservoir, dredges roads for oil and gas transportation, and further improves the recovery ratio of oil and gas.
The present invention has no special requirements for the equipment such as the drill bit, the drill stem, the high pressure pump, etc., and the equipment can be adopted by the equipment which is well known to those skilled in the art.
In the invention, the structural schematic diagram of the equipment for reservoir reconstruction is shown in fig. 1-2, wherein fig. 1 is a side view, and fig. 2 is a top view; the following is described in detail with reference to FIGS. 1-2: the drill bit 3 is adopted to drill the stratum, the high-pressure pump 7 pumps the blowout-preventing slurry in the slurry matching system 1 into the slurry underground injection channel 4 in the middle annular space of the drill rod 2, and the slurry is sprayed at the drill bit 3 and wraps the rock fragments and returns to the ground through the slurry underground return channel 5. When the drill bit 3 is drilled in a dense natural gas layer, the high-pressure pump 7 pumps anti-blowout slurry into the slurry underground injection channel 4 in the middle annular space of the drill rod 2, and the slurry is sprayed at the drill bit 3 and wraps rock fragments and returns to the ground through the slurry underground return channel 5 (the gap between the drill rod and the stratum rock fragment 6 is the slurry underground channel 5); when the drill bit 3 is drilled in a compact natural gas layer, the high-pressure pump 7 pumps mixed drilling mud consisting of blowout prevention mud, acetone and tetrahydrofuran into the mud underground injection channel 4 in the middle annular space of the drill rod 2, and when the drill bit 3 is drilled in a compact petroleum layer, the high-pressure pump 7 pumps mixed drilling mud consisting of blowout prevention mud, carbon disulfide and tetrahydrofuran into the mud underground injection channel 4 in the middle annular space of the drill rod 2; mixed drilling mud is ejected from the drill bit 3, flushing the reservoir and entraining the rock fragments back to the surface through the mud underground return passage 5.
In the invention, the mass ratio of the blowout prevention mud, the tetrahydrofuran and the carbon disulfide is consistent with the scheme, and the details are not repeated; the mass ratio of the blowout prevention mud, the tetrahydrofuran and the acetone is consistent with the scheme, and the details are not repeated. In the specific embodiment of the invention, the tetrahydrofuran in the mixed drilling mud is preferably controlled to enter the reservoir transformation at a lower proportion, oil and gas exploitation is normally carried out while the reservoir transformation is carried out, and when the oil and gas recovery rate is reduced, the proportion of the tetrahydrofuran is further increased, and the dissolution of asphaltene in the reservoir is promoted, so that the aim of further increasing the oil and gas recovery rate is fulfilled. Fig. 3 is a flow chart of the work flow of the hydrocarbon reservoir reforming method provided by the present invention.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example 1
The mixed drilling mud consists of blowout prevention mud, acetone and tetrahydrofuran, wherein the mass ratio of the blowout prevention mud to the acetone to the tetrahydrofuran is 96:3: 1.
Example 2
The mixed drilling mud consists of blowout prevention mud, acetone and tetrahydrofuran, wherein the mass ratio of the blowout prevention mud to the acetone to the tetrahydrofuran is 90:5: 5.
Example 3
The mixed drilling mud consists of blowout prevention mud, acetone and tetrahydrofuran, wherein the mass ratio of the blowout prevention mud to the acetone to the tetrahydrofuran is 85:7: 8.
Example 4
The mixed drilling mud consists of blowout prevention mud, carbon disulfide and tetrahydrofuran, wherein the mass ratio of the blowout prevention mud to the carbon disulfide to the tetrahydrofuran is 92:5: 3.
Example 5
The mixed drilling mud consists of blowout prevention mud, carbon disulfide and tetrahydrofuran, wherein the mass ratio of the blowout prevention mud to the carbon disulfide to the tetrahydrofuran is 78:10: 12.
Example 6
The mixed drilling mud consists of blowout prevention mud, carbon disulfide and tetrahydrofuran, wherein the mass ratio of the blowout prevention mud to the carbon disulfide to the tetrahydrofuran is 85:5: 10.
And (3) performance testing:
(1) the mixed drilling mud in the example 1 is adopted to soak continental facies shale rock, when the soaking time is 100 hours, the material-liquid ratio is 50 g: 500mL, adopting a water bath heating soaking method to test the micropore (< 2nm) volume of the rock before and after soaking, and showing that the micropore volume of the rock before soaking is 0.0041cm3(g) the micropore volume of the rock after soaking was 0.0058cm3/g。
The water bath heating soaking method is adopted to detect the asphaltene content of the rock before and after soaking, and the result shows that the asphaltene content of the rock before soaking is 0.8g, and the asphaltene content of the rock after soaking is about 0.2 g.
The same tests are carried out on the mixed drilling mud in the embodiments 2 to 3, and the results show that the mixed drilling mud in the embodiments 2 to 3 can improve the micropore volume of the rock after being soaked, which shows that a large number of micropores are released, and the content of asphaltene in the rock can be reduced.
(2) MiningSoaking continental facies shale rock with the mixed drilling mud of example 4 for 100 hours at a material to liquid ratio of 50 g: 500mL, and the volume of the middle hole (2-50nm) of the rock before and after soaking is tested by a water bath heating soaking method, and the result shows that the volume of the middle hole of the rock before and after soaking is 0.003cm3(g) after soaking, the volume of the mesopores of the rock is 0.0098cm3/g。
The water bath heating soaking method is adopted to detect the asphaltene content of the rock before and after soaking, and the result shows that the asphaltene content of the rock before soaking is 1.2g, and the asphaltene content of the rock after soaking is 0.4 g.
The same tests are carried out on the mixed drilling mud obtained in the embodiments 5 to 6, and the results show that the mixed drilling mud obtained in the embodiments 5 to 6 can improve the mesopore volume of the rock and can reduce the content of asphaltene in the rock after being soaked.
Example 7
Carrying out reservoir transformation on a compact natural gas reservoir simulated by a laboratory computer, simulating a drill bit to drill into a stratum, pumping blowout-preventing slurry into a slurry underground injection channel in the middle annular space of a drill rod by a high-pressure pump, and spraying the slurry at the drill bit and wrapping rock fragments to return to the ground through a slurry underground return channel. When a drill bit encounters a compact natural gas layer, mixed drilling mud jointly composed of blowout prevention mud, acetone and tetrahydrofuran (the mass ratio of the blowout prevention mud to the acetone to the tetrahydrofuran is 96:3:1) is pumped into a mud underground injection channel in the middle annular space of a drill rod by a high-pressure pump, the mixed drilling mud washes the compact natural gas reservoir layer, micropores in the compact natural gas layer are released, and a natural gas transportation channel is dredged; the method comprises the steps of effectively exploiting natural gas while improving a mixed drilling mud reservoir, changing the mass ratio of blowout prevention mud, acetone and tetrahydrofuran in the mixed drilling mud to 90:5:5 when the yield of the natural gas is reduced, continuously improving the reservoir, and increasing the ratio of the tetrahydrofuran in the mixed drilling mud to increase the yield of the natural gas.
Example 8
Carrying out reservoir transformation on a compact petroleum reservoir simulated by a laboratory computer, simulating a drill bit to drill into a stratum, pumping blowout-preventing slurry into a slurry underground injection channel in the middle annular space of a drill rod by a high-pressure pump, and spraying the slurry at the drill bit and wrapping rock fragments to return to the ground through a slurry underground return channel. When a drill bit encounters a compact petroleum layer, pumping mixed drilling mud consisting of blowout prevention mud, carbon disulfide and tetrahydrofuran (the mass ratio of the blowout prevention mud to the carbon disulfide to the tetrahydrofuran is 92:5:3) into a mud underground injection channel in the middle annular space of a drill rod by adopting a high-pressure pump, flushing the compact natural gas reservoir layer by the mixed drilling mud, releasing a mesopore in the compact petroleum layer, and dredging a transportation channel of petroleum; the method comprises the steps of effectively exploiting oil while modifying a mixed drilling mud reservoir, changing the mass ratio of blowout prevention mud, carbon disulfide and tetrahydrofuran in the mixed drilling mud to 78:10:12 when the oil yield is reduced, continuously modifying the reservoir, and increasing the tetrahydrofuran ratio in the mixed drilling mud to increase the oil yield.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (5)

1. The mixed drilling mud is characterized by comprising blowout prevention mud, tetrahydrofuran and an auxiliary component, wherein the auxiliary component is acetone or carbon disulfide.
2. The mixed drilling mud of claim 1, wherein when the auxiliary component is acetone, the mass ratio of the blowout prevention mud, acetone and tetrahydrofuran is (85-96): (3-7): (1-8).
3. The mixed drilling mud of claim 1, wherein when the auxiliary component is carbon disulfide, the mass ratio of the blowout prevention mud, the carbon disulfide and the tetrahydrofuran is (78-92): (5-10): (3-12).
4. A method for reconstructing an underground compact oil and gas reservoir is characterized by comprising the following steps:
injecting the mixed drilling mud of any one of claims 1 to 3 into a dense underground hydrocarbon reservoir for reservoir reconstruction.
5. A method of modification according to claim 4, wherein the method of reservoir modification comprises in particular: drilling a stratum by using a drill bit, wherein the drill bit is connected with a drill rod, when an underground compact oil and gas reservoir is met, mixed drilling mud is injected by using a high-pressure pump through a mud injection channel of the drill rod, is jetted out from the drill bit, washes the compact oil and gas reservoir and returns to the ground through a mud underground return channel; when the underground compact oil and gas reservoir is a compact oil layer, the components of the mixed drilling mud comprise blowout prevention mud, tetrahydrofuran and carbon disulfide; when the underground compact oil and gas reservoir is a compact natural gas reservoir, the components of the mixed drilling mud comprise blowout prevention mud, tetrahydrofuran and acetone.
CN202111319529.6A 2021-11-09 2021-11-09 Mixed drilling mud and method for improving underground compact oil and gas reservoir Pending CN114015423A (en)

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