CN113185955A - Oil-based drilling fluid and preparation method and application thereof - Google Patents
Oil-based drilling fluid and preparation method and application thereof Download PDFInfo
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- 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
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
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- C01B32/182—Graphene
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- 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
- C09K8/502—Oil-based compositions
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Abstract
The invention relates to the technical field of drilling fluid, in particular to an oil-based drilling fluid and a preparation method and application thereof, wherein the oil-based drilling fluid comprises the following components: white oil, organic soil, calcium chloride solution, calcium oxide, a main emulsifier, an auxiliary emulsifier, a wetting agent, a plugging agent, barite and a filtrate reducer; the plugging agent is one or more of 1250-mesh superfine calcium carbonate, 2250-mesh superfine calcium carbonate, a nano plugging agent and an asphalt plugging agent ME-CAL; the nano plugging agent is sodium dodecyl benzene sulfonate or sodium heavy alkyl benzene sulfonate modified nano graphene, and the average particle size of the nano plugging agent is 80-210 nm. According to the invention, the superfine calcium carbonate rigid particles and the modified nano graphene rigid small particles with two particle sizes are adopted, the particle size grading is reasonable, the optimal addition amount is matched, the multi-element synergetic plugging is realized through bridging filling under the high-temperature action in the well, and the composite material is applied to the drilling process in the deep shale layer, so that the plugging capability of the drilling fluid is enhanced.
Description
Technical Field
The invention relates to the technical field of drilling fluid, in particular to oil-based drilling fluid and a preparation method and application thereof.
Background
The large-scale development of shale gas in the south of the Sichuan is brought into the national key development plan and is a national strategic task which must be completed by people. Wherein, safe, high-efficient, the low cost is played shale long well section horizontal well and is a key and necessary condition.
At present, the technology of drilling a shale long-section horizontal well by using an oil-based drilling fluid is basically mature, but some problems are still not well solved, such as the problem of well wall stability (mainly block dropping) of the shale long-section horizontal well and the downhole complex condition caused by the problem are serious.
Deep shale contains a large amount of oil and gas resources, so the development of deep shale gas is also the basis of petroleum yield increase in China in the future. According to the requirement of shale gas engineering development, the borehole wall instability problem is more prominent in the drilling of deep shale. Therefore, the improvement and the improvement of the anti-collapse capability of the existing oil-based slurry are the technical problems which need to be solved at present.
In the drilling process, when the active shale is contacted with the conventional oil-based drilling fluid, filtrate of the oil-based drilling fluid can invade the microcracks, so that the microcracks and the microcracks are cracked, a well wall falls, and the stability of the well wall is seriously influenced. The existing conventional plugging method cannot meet the drilling requirement.
The white oil-based drilling fluid has good rheological property, higher low shear rate viscosity and stronger dynamic and static sand suspending capacity, and can efficiently clean a borehole. In addition, the white oil-based drilling fluid has good chemical stability and has obvious advantages in the drilling of high-temperature deep wells and water-sensitive formations.
The micro cracks of the Wufeng-Longmaxi group shale are distributed between 104nm and 244 mu m, which puts higher requirements on the blocking agent, and in order to form a compact blocking layer on a well wall, the particle size distribution of the blocking agent must be considered, and the scientific and reasonable selection of the particle size distribution is particularly important, so that the problem of instability of the well wall of deep shale with the micro cracks developing can be solved, and the problem of stress instability of the hard and brittle shale caused by the fact that drilling fluid filtrate enters the stratum in the drilling process is prevented.
Disclosure of Invention
The invention provides an oil-based drilling fluid and a preparation method and an application method thereof, and solves the technical problems that the current oil-based drilling fluid has overlarge filtration loss and invades into microcracks in the drilling process and seriously influences the stability of a well wall.
The invention is realized by the following technical scheme:
the invention provides an oil-based drilling fluid in a first aspect, which comprises the following components: white oil, organic soil, calcium chloride solution, calcium oxide, a main emulsifier, an auxiliary emulsifier, a wetting agent, a plugging agent, barite and a filtrate reducer;
the plugging agent is one or more of 1250-mesh ultrafine calcium carbonate, 2250-mesh ultrafine calcium carbonate, a nano plugging agent and an asphalt plugging agent ME-CAL; preferably, the plugging agent is a compound of 1250-mesh ultrafine calcium carbonate, 2250-mesh ultrafine calcium carbonate, a nano plugging agent and an asphalt plugging agent ME-CAL, wherein the weight ratio of the 1250-mesh ultrafine calcium carbonate to the 2250-mesh ultrafine calcium carbonate is 1: 1;
the nano plugging agent is sodium dodecyl benzene sulfonate or sodium heavy alkylbenzene sulfonate modified nano graphene, the average particle size of the nano plugging agent is 80-210 nm, and preferably, the nano plugging agent is sodium dodecyl benzene sulfonate modified nano graphene; preferably, the average particle size of the nano plugging agent is 100-160 nm, more preferably 115-140 nm, and even more preferably 115.7-130.3 nm.
Preferably, the drilling fluid comprises the following components in parts by weight: 100 parts of white oil, 2-9 parts of organic soil, 8-25 parts of calcium chloride solution, 1-7 parts of main emulsifier, 1-6 parts of auxiliary emulsifier, 2-7 parts of wetting agent, 2-9 parts of calcium oxide, 3-15 parts of plugging agent, 5-20 parts of weighting agent and 2-8 parts of filtrate reducer.
Preferably, the drilling fluid comprises the following components in parts by weight: 100 parts of white oil, 3-8 parts of organic soil, 12-25 parts of calcium chloride solution, 2-6 parts of main emulsifier, 2-5 parts of auxiliary emulsifier, 3-5 parts of wetting agent, 3-7 parts of calcium oxide, 6-12 parts of plugging agent, 7-18 parts of weighting agent and 3-6 parts of filtrate reducer.
Preferably, the main emulsifier is one or more of IEMUL, long-chain alkyl acid salt OME, WO-NT and fatty amine derivative DQGC, and more preferably, the emulsifier is long-chain alkyl acid salt OME; the auxiliary emulsifier is one or more of FR180, OME-2, surfactant HICOAT and PFMOCOT, and more preferably, the emulsifier is FR 180.
Preferably, the wetting agent is one or more of modified quaternary ammonium salt MOWET, OW and COSL, and more preferably, the wetting agent is modified quaternary ammonium salt MOWET.
Preferably, the barite is one or more of API barite and ultrafine powder, and more preferably, the barite is API barite.
Preferably, the fluid loss additive is one or more of KJR, emulsified asphalt, quaternary ammonium salt and oxidized asphalt, and more preferably, the fluid loss additive is oxidized asphalt.
Preferably, the mass fraction of the calcium chloride solution is 20%.
Preferably, the preparation method of the nano-graphene comprises the following steps:
(1) adding nano graphene into a solvent, and performing ultrasonic treatment to obtain a dispersion liquid;
(2) adding sodium heavy alkylbenzene sulfonate or sodium dodecyl benzene sulfonate into the dispersion liquid to obtain a blending solution;
(3) ultrasonically crushing the blending solution in the step (2) to obtain a dispersed nano graphene water aqua;
in the dispersion liquid, the mass concentration of the nano graphene is 0.1-0.6 mg/mL, and more preferably, the mass concentration is 0.2-0.45 mg/mL;
in the blending solution, the mass concentration of the heavy alkylbenzene sulfonate or the sodium dodecylbenzenesulfonate is 1-6.5 mg/mL, and more preferably, the mass concentration is 3.3-5.0 mg/mL;
the ultrasonic treatment conditions of the dispersion are as follows: under the condition of 35-50 ℃, the time is 5-20 min, the ultrasonic frequency is 20-40 KHz, the ultrasonic power is 130-250W, the temperature is 35-45 ℃, the time is 8-16 min, and the ultrasonic frequency is 27-40 KHz;
the ultrasonic crushing conditions of the blending solution are as follows: and mixing ice and water for 15-35 min, wherein the ultrasonic frequency is 40-75 KHz, the ultrasonic power is 300-420W, and more preferably, the ultrasonic time is 25-30 min, the ultrasonic frequency is 50-60 KHz, and the ultrasonic power is 300-360W.
The invention provides a preparation method of an oil-based drilling fluid, which comprises the following steps:
(1) sequentially adding a calcium chloride solution, calcium oxide, a main emulsifier, an auxiliary emulsifier, a wetting agent and organic soil into the white oil, and sequentially mixing to prepare base slurry;
(2) sequentially adding superfine calcium carbonate, an asphalt blocking agent ME-CAL, a nano blocking agent, a filtrate reducer and barite into the base slurry, and sequentially mixing;
the third aspect of the invention provides an application of an oil-based drilling fluid in drilling a well in a deep shale layer, in particular to a shale gas well which has serious microcrack development chipping and is easy to break and frequent borehole wall instability; the shale brittle stratum refers to a hard brittle shale stratum with obvious stratum bedding and microcrack development and strong heterogeneity, and the hard brittle shale stratum is easy to cause underground complex conditions and accidents in the drilling process.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the invention, the rigid particles of the superfine calcium carbonate with two particle sizes and the rigid small particles of the modified nano graphene are adopted, according to reasonable particle size grading and optimal addition, and are filled through bridging under the high-temperature action in the well, so that the multielement synergetic plugging is fully realized, and the plugging capability of the drilling fluid is enhanced.
(2) The nano graphene prepared by the invention has good stability and dispersibility and uniform particle size distribution, and the prepared oil-based drilling fluid blocks micro cracks and micropores, prevents drilling fluid filtrate from entering into a borehole wall crack to generate stress release cracks, prevents the problem of drill sticking caused by borehole wall collapse and block falling in the drilling process, and efficiently blocks and prevents collapse.
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.
Preparation method of nano graphene
The invention firstly prepares nano-graphene with a certain particle size, and the preparation method comprises the following steps:
preferably, the preparation method of the nano-graphene comprises the following steps:
(1) adding nano graphene into a solvent, and performing ultrasonic treatment to obtain a dispersion liquid;
(2) adding sodium heavy alkylbenzene sulfonate or sodium dodecyl benzene sulfonate into the dispersion liquid to obtain a blending solution;
(3) ultrasonically crushing the blending solution in the step (2) to obtain a dispersed nano graphene water aqua;
in the dispersion liquid, the mass concentration of the nano graphene is 0.1-0.6 mg/mL, and more preferably, the mass concentration is 0.2-0.45 mg/mL;
in the blending solution, the mass concentration of the heavy alkylbenzene sulfonate or the sodium dodecylbenzenesulfonate is 1.0-6.5 mg/mL, and more preferably, the mass concentration is 3.3-5.0 mg/mL;
the ultrasonic treatment conditions of the dispersion are as follows: at the temperature of 35-50 ℃, the time is 5-20 min, the ultrasonic frequency is 20-40 KHz, and the ultrasonic power is 130-250W; more preferably, the temperature is 35-45 ℃, the time is 8-16 min, and the ultrasonic frequency is 27-40 KHz;
the ultrasonic crushing conditions of the blending solution are as follows: mixing ice and water at the temperature of-12-0 ℃ to-3-0 ℃ for 15-35 min, wherein the ultrasonic frequency is 40-75 KHz, and the ultrasonic power is 300-420W; more preferably, the ultrasonic frequency is 50-60 KHz for 25-30 min, and the ultrasonic power is 300-360W.
The specific preparation process is shown in preparation examples 1-3.
Preparation example 1: preparation of nano graphene
(1) Weighing a certain amount of nano graphene, adding 90mL of water to obtain a nano graphene aqueous solution with the mass concentration of 0.1mg/mL, carrying out ultrasonic treatment on the solution at 40 ℃ for 10min, and obtaining a dispersion liquid by using the ultrasonic power of an ultrasonic cleaning instrument of 150W and the ultrasonic frequency of 30 Hz;
(2) adding a certain amount of sodium dodecyl benzene sulfonate into the dispersion liquid for blending to obtain a blending solution with the mass concentration of the sodium dodecyl benzene sulfonate of 1.0 mg/mL;
(3) crushing and ultrasonically treating the blended solution for 15min by adopting an ultrasonic cell crusher under the ice bath condition; and finally, obtaining the uniformly dispersed nano graphene water aqua with the ultrasonic power of 330W and the frequency of 45 KHz.
The nano graphene prepared according to the steps is a black water agent, has an average particle size of 110nm, and can effectively seal the nano pores of the shale formation.
Preparation example 2: preparation of nano graphene
(1) Weighing a certain amount of nano graphene, adding 80mL of water to obtain a nano graphene aqueous solution with the mass concentration of 0.6mg/mL, carrying out ultrasonic treatment on the solution at 40 ℃ for 14min, and obtaining a dispersion liquid by using an ultrasonic cleaner with the ultrasonic power of 200W and the ultrasonic frequency of 30 Hz;
(2) adding a certain amount of sodium dodecyl benzene sulfonate into the dispersion liquid for blending to obtain a blending solution with the mass concentration of the sodium dodecyl benzene sulfonate of 6.5 mg/mL;
(3) crushing and ultrasonically treating the blended solution for 15min by adopting an ultrasonic cell crusher under the ice bath condition; and finally, obtaining the uniformly dispersed nano graphene water aqua with the ultrasonic power of 350W and the frequency of 45 KHz.
The nano-graphene plugging agent prepared according to the steps is a black water agent, has an average particle size of 105nm, and can effectively seal the nano-pores of the shale formation.
Preparation example 3: preparation of nano graphene
(1) Weighing a certain amount of nano graphene, adding 80mL of water to obtain a nano graphene aqueous solution with the mass concentration of 0.2mg/mL, carrying out ultrasonic treatment on the solution at 40 ℃ for 16min, and obtaining a dispersion liquid by using the ultrasonic power of an ultrasonic cleaning instrument of 250W and the ultrasonic frequency of 30 Hz;
(2) adding a certain amount of sodium dodecyl benzene sulfonate into the dispersion liquid for blending to obtain a blending solution with the mass concentration of the sodium dodecyl benzene sulfonate of 3.3 mg/mL;
(3) crushing and ultrasonically treating the blended solution for 30min by adopting an ultrasonic cell crusher under the ice bath condition; and finally, obtaining the uniformly dispersed nano graphene water aqua with the ultrasonic power of 380W and the frequency of 45 KHz.
The nano-graphene plugging agent prepared according to the steps is a black water agent, has an average particle size of 88nm, and can effectively plug the nano-pores of the shale formation.
Oil-based drilling fluid and preparation method thereof
1. The oil-based drilling fluid comprises the following components in the examples and the comparative examples in parts by weight:
TABLE 1 table of components and parts by weight in examples and comparative examples
The raw materials used in the invention, organic soil, white oil, calcium chloride, OME, FR180, superfine calcium carbonate, oxidized asphalt and heavy gold stone can be products sold on the market, the white oil is industrial No. 5 white oil, and the specific name, code, chemical composition and manufacturer of each raw material are shown in Table 2.
And strictly inspecting according to the industrial standard or the enterprise standard during purchasing, and using after the inspection is qualified. The nano graphene is self-synthesized by the applicant, and specifically refers to the preparation example in the above specific implementation process. The manufacturers of the raw materials can adjust the raw materials according to actual needs, and the following table 2 is only used as an illustration of specific examples and is not intended to limit the present invention.
TABLE 2 detailed table of the respective raw material conditions related to the present invention
2. Preparation process of oil-based drilling fluid of each embodiment and comparative example
(1) Example 1: preparation of oil-based drilling fluid
According to the weight parts of the components in the example 1 in the table 1, 5# white oil and 20% calcium chloride solution are taken and stirred for 20min at the stirring speed of 600 r/min; adding calcium oxide, and stirring for 10 min; adding OME and FR180 under stirring at 800r/min, and stirring for 30 min; adding MOWET under stirring at 1000r/min, and stirring for 30 min; adding organic soil under stirring at 1000r/min, and stirring for 30 min; adding 1250-mesh superfine calcium carbonate into the mixture under stirring at 3000r/min, and stirring for 30 min; adding 2250-mesh superfine calcium carbonate under stirring at 3000r/min, and stirring for 30 min; adding ME-CAL under stirring at 3000r/min, and stirring for 40 min; adding the self-made modified nano-graphene under stirring at 3000r/min, and stirring for 40 min; adding the oxidized asphalt under stirring at 3000r/min, and stirring for 30 min; adding heavy diamond under stirring at 3000r/min, and stirring for 30 min. An oil-based drilling fluid S1 was prepared, and the performance test results are shown in table 3.
The homemade modified nano-graphene in this example is prepared in preparation example 1.
Example 2:
an oil-based drilling fluid S2 was prepared according to the parts by weight of the components of example 2 in table 1, under the same preparation method and conditions as in example 1, and the results of the performance tests are shown in table 3.
The homemade modified nano-graphene in this example is prepared in preparation example 2.
Example 3:
an oil-based drilling fluid S3 was prepared according to the parts by weight of the components of example 3 in table 1, under the same preparation method and conditions as in example 1, and the results of the performance tests are shown in table 3.
The modified nano-graphene prepared by self in this example is prepared by preparation example 3.
Example 4:
an oil-based drilling fluid S4 was prepared according to the parts by weight of the components of example 4 in table 1, under the same preparation method and conditions as in example 1, and the results of the performance tests are shown in table 3.
The modified nano-graphene prepared by self in this example is prepared by preparation example 1.
Example 5:
according to the weight parts of the components of the example 5 in the table 1, the preparation method and the conditions are the same as those of the example 1, and the nano graphene in the example is prepared by the method of the preparation example 2. An oil-based drilling fluid S5 was prepared.
Example 6: the preparation method is the same as that of example 1 according to the parts by weight of the components of example 6 in table 1, and the nano graphene in the example is prepared by the method of preparation example 2. An oil-based drilling fluid S6 was prepared.
Example 7: according to the weight parts of the components of the example 7 in the table 1, the preparation method and the conditions are the same as those of the example 1, and the nano graphene in the example is prepared by the method of the preparation example 2. An oil-based drilling fluid S7 was prepared.
Example 8: according to the weight parts of the components of the example 8 in the table 1, the preparation method and the conditions are the same as those of the example 1, and the nano graphene in the example is prepared by the method of the preparation example 2. An oil-based drilling fluid S8 was prepared.
Example 9: according to the weight parts of the components of the example 9 in the table 1, the preparation method and the conditions are the same as those of the example 1, and the nano graphene in the example is prepared by the method of the preparation example 3. An oil-based drilling fluid S9 was prepared.
Example 10: according to the weight parts of the components of the example 10 in the table 1, the preparation method and the conditions are the same as those of the example 1, and the nano graphene in the example is prepared by the method of the preparation example 3. An oil-based drilling fluid S10 was prepared.
Example 11: according to the weight parts of the components of the example 11 in the table 1, the preparation method and the conditions are the same as those of the example 1, and the nano graphene in the example is prepared by the method of the preparation example 3. An oil-based drilling fluid S11 was prepared.
Example 12: according to the weight parts of the components of the example 12 in the table 1, the preparation method and the conditions are the same as those of the example 1, and the nano graphene in the example is prepared by the method of the preparation example 3. An oil-based drilling fluid S12 was prepared.
Comparative example 1: an oil-based drilling fluid D1 was prepared according to the parts by weight of the components of comparative example 1 in table 1.
Comparative example 2: an oil-based drilling fluid D2 was prepared according to the parts by weight of the components of comparative example 2 in table 1.
Comparative example 3: an oil-based drilling fluid D3 was prepared according to the parts by weight of the components of comparative example 3 in table 1.
Comparative example 4: an oil-based drilling fluid D4 was prepared according to the parts by weight of the components of comparative example 4 in table 1.
Comparative example 5: an oil-based drilling fluid D5 was prepared according to the parts by weight of the components of comparative example 5 in table 1.
Comparative example 6: an oil-based drilling fluid D6 was prepared according to the parts by weight of the components of comparative example 6 in table 1.
3. Testing
The performance of the oil-based drilling fluids prepared in examples 1 to 12 and comparative examples 1 to 7 was tested, and the test method was:
(1) respectively taking a proper amount of the oil-based drilling fluid prepared in the examples 1-12 and the comparative examples 1-6 for later use,
(2) take 250cm3Stirring the 40-mesh quartz sand, slowly adding the quartz sand into a transparent cylindrical drilling fluid cup of a visual sand bed filtration loss instrument, and simulating a carbonate rock heterogeneous pore-seam type fragile stratum;
(3) respectively taking the mixture above 500cm3The spare drilling fluid prepared in each embodiment and comparative example is slowly added into a drilling fluid cup, the cup cover is closed, a nitrogen gas source is connected to adjust the air pressure to 0.69MP, and after no error is confirmed, a vent valve is opened, and the pressure is transmitted into the drilling fluid cup. Therefore, the percolation effect of the drilling fluid under the action of high formation pressure in the circulation process of the shaft is simulated, the percolation process of the drilling fluid in the transparent cup body is observed at the same time, and the immersion depth of the drilling fluid in 7.5min and 30min is recorded respectively. The test results are shown in table 3.
Table 3 table of testing results of drilling fluid immersion depth experiment
As shown in Table 3, in examples 1 to 12, the immersion depth of the drilling fluid is less than 4.0cm at 7.5min and less than 6cm at 30 min; compared with the drilling fluids of 1-6, the immersion depth of the drilling fluid is higher than 4.2cm in 7.5min and is close to 9cm in 30min, and therefore the oil-based drilling fluid prepared by the method can effectively prevent the stratum from collapsing and keep the stratum stable.
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 (10)
1. The oil-based drilling fluid is characterized by comprising the following components: white oil, organic soil, calcium chloride solution, calcium oxide, a main emulsifier, an auxiliary emulsifier, a wetting agent, a plugging agent, barite and a filtrate reducer;
the plugging agent is one or more of 1250-mesh ultrafine calcium carbonate, 2250-mesh ultrafine calcium carbonate, a nano plugging agent and an asphalt plugging agent ME-CAL;
the nano plugging agent is sodium dodecyl benzene sulfonate or sodium heavy alkyl benzene sulfonate modified nano graphene, and the average particle size of the nano plugging agent is 80-210 nm.
2. The oil-based drilling fluid of claim 1, wherein said drilling fluid comprises the following components in parts by weight: 100 parts of white oil, 2-9 parts of organic soil, 8-25 parts of calcium chloride solution, 1-7 parts of main emulsifier, 1-6 parts of auxiliary emulsifier, 2-7 parts of wetting agent, 2-9 parts of calcium oxide, 3-15 parts of plugging agent, 5-20 parts of weighting agent and 2-8 parts of filtrate reducer.
3. The oil-based drilling fluid of claim 1, wherein said drilling fluid comprises the following components in parts by weight: 100 parts of white oil, 3-8 parts of organic soil, 12-25 parts of calcium chloride solution, 2-6 parts of main emulsifier, 2-5 parts of auxiliary emulsifier, 3-5 parts of wetting agent, 3-7 parts of calcium oxide, 6-12 parts of plugging agent, 7-18 parts of weighting agent and 3-6 parts of filtrate reducer.
4. The oil-based drilling fluid of claim 1, wherein:
the main emulsifier is one or more of IEMUL, long-chain alkyl acid salt OME, WO-NT and fatty amine derivative DQGC;
the auxiliary emulsifier is one or more of FR180, OME-2, surfactant HICOAT and PFMOCOT.
5. The oil-based drilling fluid of claim 1, wherein: the wetting agent is one or more of modified quaternary ammonium salts MOWET, OW and COSL.
6. The oil-based drilling fluid of claim 1, wherein: the barite is one or more of API barite and ultrafine powder.
7. The oil-based drilling fluid of claim 1, wherein: the fluid loss additive is one or more of KJR, emulsified asphalt, quaternary ammonium salt and oxidized asphalt.
8. The oil-based drilling fluid according to any one of claims 1 to 7, wherein: the preparation method of the nano graphene comprises the following steps:
(1) adding nano graphene into a solvent, and performing ultrasonic treatment to obtain a dispersion liquid;
(2) adding sodium heavy alkylbenzene sulfonate or sodium dodecyl benzene sulfonate into the dispersion liquid to obtain a blending solution;
(3) ultrasonically crushing the blending solution in the step (2) to obtain a dispersed nano graphene water aqua;
in the dispersion liquid, the mass concentration of the nano graphene is 0.1-0.6 mg/mL;
in the blending solution, the mass concentration of the heavy alkylbenzene sulfonate or the sodium dodecylbenzenesulfonate is 1-6.5 mg/mL;
the ultrasonic treatment conditions of the dispersion are as follows: at the temperature of 35-50 ℃, the time is 5-20 min, the ultrasonic frequency is 20-40 KHz, and the ultrasonic power is 130-240W;
the ultrasonic crushing conditions of the blending solution are as follows: mixing ice and water for 15-35 min, wherein the ultrasonic frequency is 40-75 KHz, and the ultrasonic power is 300-420W.
9. The preparation method of the oil-based drilling fluid according to any one of claims 1 to 7, characterized by comprising the steps of:
(1) sequentially adding a calcium chloride solution, calcium oxide, a main emulsifier, an auxiliary emulsifier, a wetting agent and organic soil into the white oil, and sequentially mixing and stirring to prepare base slurry;
(2) and sequentially adding superfine calcium carbonate, an asphalt blocking agent ME-CAL, a nano blocking agent, a filtrate reducer and barite into the base slurry, and sequentially mixing and stirring.
10. Use of an oil-based drilling fluid according to any one of claims 1 to 7 or prepared according to the method of claim 9 for drilling in deep shale formations.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115340854A (en) * | 2022-08-03 | 2022-11-15 | 西南石油大学 | Anti-sloughing drilling fluid and application thereof |
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