CN103923623A - Oil-based drilling fluid - Google Patents

Oil-based drilling fluid Download PDF

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Publication number
CN103923623A
CN103923623A CN201410132954.8A CN201410132954A CN103923623A CN 103923623 A CN103923623 A CN 103923623A CN 201410132954 A CN201410132954 A CN 201410132954A CN 103923623 A CN103923623 A CN 103923623A
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drilling fluid
oil
agent
wetting agent
acid
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CN103923623B (en
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王京光
杨斌
张小平
赵海峰
吴满祥
王勇强
曹辉
吴超
寄晓宁
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Engineering Technology Research Institute of CNPC Chuanqing Drilling Engineering Co ltd
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Engineering Technology Research Institute of CNPC Chuanqing Drilling Engineering Co ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02Well-drilling compositions
    • C09K8/32Non-aqueous well-drilling compositions, e.g. oil-based
    • C09K8/34Organic liquids

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

The invention discloses oil-based drilling fluid and belongs to the technical field of chemistry of the oil-gas field. The oil-based drilling fluid comprises the following components in percentage by weight: 1%-3% of wetting agent, 50-80% of base oil, 5%-10% of CaCl2 salt water, 2%-5% of emulsifying agent, 3%-6% of fluid loss agent, 0.5%-3% of calcium hydroxide, 0.3%-2% of gelling agent, 0.5%-3% of viscosity increasing agent and the balance of weighting material, wherein the wetting agent comprises the following components in percentage by weight: 60% of vegetable pin tar and 40% of vegetable oleic acid. The oil-based drilling fluid has the advantages that the components of the wetting agent are low in cost and are not limited by the source; the condensation of the weighing material can be effectively avoided, the suspending stability of the weighing material in the drilling fluid system is improved and the requirement of the drilling construction of the non-conventional oil-gas reservoir for the high-density oil-based drilling fluid is met.

Description

A kind of oil base drilling fluid
Technical field
The invention belongs to oil-gas field technical field of chemistry, relate to a kind of oil base drilling fluid, particularly a kind of high density oil base drilling fluid of the wetting agent preparation that is component in order to plant Stockholm tar and vegetable oil acid.
Background technology
Drilling fluid is called again drilling fluid, is the circulation flushing medium using in drilling process mesopore.Drilling fluid mainly completes the task of suspension, pressure-controlling, rock stratum stability, buoyancy, lubrication and cooling in drilling process.At the bottom of drilling fluid has clear well, cutting carring; Cooling and Lubricator drill bit and drill string; Balance rock of borehole wall pressure, sealing and stabilizing borehole; Equilibrium strata pressure; Reduce landwaste settling velocity; Can sink on ground except sand and landwaste; Effectively transmit effective power; Bear the part gravity of drilling rod and sleeve pipe; The great mass of data of drilled strata is provided; By vital role such as hydrofracture rocks.Drilling fluid is mainly made up of liquid phase, solid phase and chemical processing agent.Drilling fluid can be divided into oil base drilling fluid, water-base drilling fluid, gaseous type drilling fluid etc. by dispersion medium (external phase).
At present, conventional drilling fluid is oil base drilling fluid and water-base drilling fluid in actual applications.Wherein, oil base drilling fluid is a kind of colloidal sol suspension mixed system taking oil as dispersion medium.Along with deepening continuously of Oil And Gas Exploration And Development, to the quality and performance of drilling fluid proposed more comprehensively, higher requirement.Especially both at home and abroad, to the carrying out taking shale gas as the large-scale development of the unconventional gas reservoir of mark, the application of oil base drilling fluid is more and more extensive.Compared with traditional water-base drilling fluid, oil base drilling fluid is able to widespread use because of its good rejection, lubricity, rheological property in shale gas probing.
In the oil base drilling fluid increasing the weight of, use various wetting ability high-density weighting materials, as barite, powdered iron ore etc., most of high-density weighting materials are hydrophilic.In the time that the hydrophilic solid particulate such as ground barium sulfate and drilling cuttings enters people's oil base drilling fluid, they trend towards being combined with water and occurring coalescent, cause drilling fluid rheology control difficulty, wellbore liquid leaching loss quantitative change is large, emulsion-breaking voltage significantly declines, thereby the stability of destroying milk sap especially causes the high-density of system to be difficult to maintain in high density oil base drilling fluid, has brought sizable well control risk.
In order to address this problem, oil base drilling fluid system is all used wetting agent at present, makes high-density weighting material surface that the reversion of high-density weighting material oleophylic occur.Adding of wetting agent makes the barite and the drilling cuttings particle surface that just enter oil base drilling fluid change rapidly lipophilicity substance into, thereby ensures that they can be suspended in oil phase preferably.Also can play to a certain extent wetting agent although be used as the tensio-active agent of emulsifying agent, its wetting effect is undesirable.In wellbore construction, the good wetting agent of conventional wetting effect has quaternary ammonium salt (as Trimethyllaurylammonium bromide), Yelkin TTS and sulfonated petro-leum etc.External conventional wetting agent has DV-33, DWA, EZ-Mul and VERSA-WET etc., and wherein DWA and EZ-Mul can double as emulsifying agent simultaneously.
It should be noted that, external wetting agent wetted with product is effective, and especially in high density oil base drilling fluid, the rheology impact to system is less, can not cause high density drilling fluid thickening, but price is high, originates limited.Home products wetting effect under conditions of high density is undesirable, high-density weighting material precipitates and causes density refractory to stablize the viscosity that often significantly improves system because moistening badness is a large amount of, cause drilling fluid feeding-up, have a strong impact on the rheological of system, bring series of problems to follow-up wellbore construction, for example make a trip not smooth, the sticky drilling rod of drilling fluid etc., and home products temperature resistance scarce capacity.Therefore, for making up the defect of domestic oil base drilling fluid, be necessary according to the characteristic of high density oil base drilling fluid, need a kind of new oil base drilling fluid cheap, excellent performance of exploitation badly and solve an above-mentioned difficult problem, meet the requirement for high density oil base drilling fluid in the performance history of unconventional hydrocarbon-bearing pool.
Summary of the invention
For effectively ensureing that high-density weighting material has good oleophylic suspension property in drilling fluid, promote the adaptability of oil base drilling fluid under conditions of high density, the requirement of the exploitation that meets unconventional hydrocarbon-bearing pool to high density oil base drilling fluid, the invention provides a kind of new oil base drilling fluid of cheap, excellent performance.
The technical scheme that the present invention takes is:
A kind of oil base drilling fluid, except comprising base oil, CaCl 2salt solution, emulsifying agent, fluid loss agent, calcium hydroxide, carry outside components such as cutting agent, tackifier and high-density weighting material, also include the wetting agent taking plant Stockholm tar and vegetable oil acid as component; By weight percentage, this drilling fluid is by described wetting agent 1% ~ 3%, base oil 50% ~ 80%, CaCl 2salt solution 5% ~ 10%, emulsifying agent 2% ~ 5%, fluid loss agent 3% ~ 6%, calcium hydroxide 0.5% ~ 3%, carry and cut agent 0.3% ~ 2%, tackifier 0.5% ~ 3%, high-density weighting material surplus composition; Described CaCl 2the mass percentage concentration of salt solution is 32%.
Plant Stockholm tar and vegetable oil acid in described wetting agent, by weight percentage, plant Stockholm tar accounts for 60% of wetting agent total amount, and vegetable oil acid accounts for 40% of wetting agent total amount.
Described base oil is any in 3# white oil, 0# diesel oil, gas liquefaction Saraline 185V.
Described emulsifying agent is calcium mahogany sulfonate, any in barium mahogany sulfonate, calcium dodecylbenzene sulphonate, hexadecyl ammonio methacrylate, SPAN-80.
Described fluid loss agent is oxidized bitumen or humic acids acid amides.
Describedly carry that to cut agent be tetradecanoic acid or isocaprylic acid aluminium.
Described tackifier are stearic acid or aluminum stearate.
Described high-density weighting material is any in barite, powdered iron ore, limestone powder, four manganese oxide.
Preferably, a kind of oil base drilling fluid, by weight percentage, by wetting agent (weight ratio of plant Stockholm tar and vegetable oil acid is 60/40) 2%, 3# white oil 60%, CaCl 2salt solution 6%, calcium dodecylbenzene sulphonate 3%, humic acids acid amides 4%, calcium hydroxide 2%, isocaprylic acid aluminium 1%, stearic acid 2%, barite 20% form; Described CaCl 2the mass percentage concentration of salt solution is 32%.
The invention has the beneficial effects as follows:
1, the present invention is on the basis of existing oil base drilling fluid, develop a kind of new oil base drilling fluid system, this drilling fluid system except can meet conventional drilling construction requirement, can also avoid the cohesion of high-density weighting material, ensure that high-density weighting material is suspended in drilling fluid system for a long time, the requirement of the exploitation that meets unconventional hydrocarbon-bearing pool to high density oil base drilling fluid.
2, the present invention is using the composition of plant Stockholm tar and vegetable oil acid as wetting agent, compared with wetting agent conventional in wellbore construction, and the component wide material sources of wetting agent, cheap.
3, rheological property of oil base drilling fluid excellence of the present invention, stable system, be convenient to wellbore construction, is worthy of popularization.
Below with reference to embodiment, the present invention is elaborated further.
Embodiment
State's internal wetting agent product wetting effect under conditions of high density is undesirable, high-density weighting material can not stably be suspended in drilling fluid system because moistened surface is bad, the bottom deposition of drilling fluid large high-density weighting material make the density distribution inequality of drilling fluid system, have a strong impact on the rheological of drilling fluid system, brought a series of disadvantageous effects to follow-up wellbore construction safely and fast.For this reason, the present invention, on the basis of existing oil base drilling fluid, filters out using the composition of plant Stockholm tar and vegetable oil acid and configures a kind of new oil base drilling fluid as wetting agent.
Oil base drilling fluid of the present invention, except comprising base oil, CaCl 2salt solution, emulsifying agent, fluid loss agent, calcium hydroxide, carry outside components such as cutting agent, tackifier and high-density weighting material, also include the wetting agent taking plant Stockholm tar and vegetable oil acid as component.The formula of this oil base drilling fluid system, by weight percentage, by described wetting agent 1% ~ 3%, base oil 50% ~ 80%, CaCl 2salt solution 5% ~ 30%, emulsifying agent 2% ~ 5%, fluid loss agent 3% ~ 6%, calcium hydroxide 0.5% ~ 3%, carry and cut agent 0.3% ~ 2%, tackifier 0.5% ~ 3%, high-density weighting material surplus composition; Described CaCl 2the mass percentage concentration of salt solution is 32%.
Plant Stockholm tar and vegetable oil acid in described wetting agent, by weight percentage, plant Stockholm tar accounts for 60% of wetting agent total amount, and vegetable oil acid accounts for 40% of wetting agent total amount.It should be noted that, plant Stockholm tar should not replace with the synthetic Stockholm tar of mineral Stockholm tar or long residuum, and vegetable oil acid can be the vegetable oil acid taking soybean, palm, rice bran as raw material.
Described base oil is any in 3# white oil, 0# diesel oil, gas liquefaction Saraline 185V.
Described emulsifying agent is calcium mahogany sulfonate, any in barium mahogany sulfonate, calcium dodecylbenzene sulphonate, hexadecyl ammonio methacrylate, SPAN-80.
Described fluid loss agent is oxidized bitumen or humic acids acid amides.
Describedly carry that to cut agent be tetradecanoic acid or isocaprylic acid aluminium.
Described tackifier are stearic acid or aluminum stearate.
Described high-density weighting material is any in barite, powdered iron ore, limestone powder, four manganese oxide.
Below in conjunction with embodiment, the formula of oil base drilling fluid of the present invention is described further.Described in each formula, wetting agent refers in particular to the wetting agent that only contains plant Stockholm tar and two kinds of components of vegetable oil acid, and by weight percentage, plant Stockholm tar accounts for 60% of wetting agent total amount, and vegetable oil acid accounts for 40% of wetting agent total amount.CaCl described in each formula 2it is 32% CaCl that salt solution refers in particular to massfraction 2salt solution.
Embodiment 1:
Oil base drilling fluid, by weight percentage, is made up of following component: 3# white oil 60%, wetting agent 1%, CaCl 2salt solution 6%, calcium mahogany sulfonate 3%, oxidized bitumen 3%, calcium hydroxide 0.5%, tetradecanoic acid 1%, stearic acid 2%, barite 23.5%.
Embodiment 2:
Oil base drilling fluid, by weight percentage, is made up of following component: 3# white oil 50%, wetting agent 2%, CaCl 2salt solution 5%, barium mahogany sulfonate 4%, oxidized bitumen 5%, calcium hydroxide 1%, isocaprylic acid aluminium 1%, stearic acid 3%, barite 29%.
Embodiment 3:
Oil base drilling fluid, by weight percentage, is made up of following component: 0# diesel oil 70%, wetting agent 3%, CaCl 2salt solution 8%, calcium dodecylbenzene sulphonate 2%, humic acids acid amides 4%, calcium hydroxide 1%, tetradecanoic acid 0.3%, aluminum stearate 0.5%, barite 11.2%.
Embodiment 4:
Oil base drilling fluid, by weight percentage, is made up of following component: 0# diesel oil 80%, wetting agent 2%, CaCl 2salt solution 5%, hexadecyl ammonio methacrylate 2%, humic acids acid amides 3%, calcium hydroxide 2%, isocaprylic acid aluminium 0.3%, aluminum stearate 0.5%, powdered iron ore 5.2%.
Embodiment 5:
Oil base drilling fluid, by weight percentage, is made up of following component: 3# white oil 50%, wetting agent 3%, CaCl 2salt solution 10%, hexadecyl ammonio methacrylate 5%, humic acids acid amides 5%, calcium hydroxide 3%, isocaprylic acid aluminium 2%, stearic acid 2%, powdered iron ore 20%.
Embodiment 6:
Oil base drilling fluid, by weight percentage, is made up of following component: 3# white oil 60%, wetting agent 2%, CaCl 2salt solution 6%, calcium mahogany sulfonate 5%, oxidized bitumen 6%, calcium hydroxide 1%, tetradecanoic acid 2%, stearic acid 2%, powdered iron ore 16%.
Embodiment 7:
Oil base drilling fluid, by weight percentage, is made up of following component: 0# diesel oil 50%, wetting agent 2.5%, CaCl 2salt solution 5%, barium mahogany sulfonate 3%, oxidized bitumen 4%, calcium hydroxide 1%, tetradecanoic acid 1%, aluminum stearate 3%, limestone powder 30.5%.
Embodiment 8:
Oil base drilling fluid, by weight percentage, is made up of following component: gas liquefaction Saraline 185V60%, wetting agent 2%, CaCl 2salt solution 5%, barium mahogany sulfonate 4%, humic acids acid amides 5%, calcium hydroxide 2%, tetradecanoic acid 1%, stearic acid 1%, limestone powder 20%.
Embodiment 9:
Oil base drilling fluid, by weight percentage, is made up of following component: gas liquefaction Saraline 185V50%, wetting agent 3%, CaCl 2salt solution 8%, calcium dodecylbenzene sulphonate 3%, humic acids acid amides 3%, calcium hydroxide 2%, isocaprylic acid aluminium 2%, stearic acid 3%, limestone powder 26%.
Embodiment 10:
Oil base drilling fluid, by weight percentage, is made up of following component: gas liquefaction Saraline 185V70%, wetting agent 2%, CaCl 2salt solution 5%, hexadecyl ammonio methacrylate 3%, oxidized bitumen 3%, calcium hydroxide 0.5%, isocaprylic acid aluminium 0.3%, aluminum stearate 2%, four manganese oxide 16.2%.
Embodiment 11:
Oil base drilling fluid, by weight percentage, is made up of following component: 3# white oil 70%, wetting agent 2%, CaCl 2salt solution 5%, SPAN-80 3%, humic acids acid amides 3%, calcium hydroxide 1%, isocaprylic acid 2%, aluminum stearate 2%, four manganese oxide 12%.
Embodiment 12:
Oil base drilling fluid, by weight percentage, is made up of following component: 3# white oil 60%, wetting agent 2%, CaCl 2salt solution 6%, calcium dodecylbenzene sulphonate 3%, humic acids acid amides 4%, calcium hydroxide 2%, isocaprylic acid aluminium 1%, stearic acid 2%, barite 20% form.
Embodiment 13:
Oil base drilling fluid, by weight percentage, is made up of following component: 0# diesel oil 60%, wetting agent 3%, CaCl 2salt solution 8%, SPAN-80 2%, oxidized bitumen 5%, calcium hydroxide 2%, isocaprylic acid aluminium 2%, aluminum stearate 1%, powdered iron ore 17%.
Embodiment 14:
Oil base drilling fluid, by weight percentage, is made up of following component: gas liquefaction Saraline 185V60%, wetting agent 3%, CaCl 2salt solution 6%, hexadecyl ammonio methacrylate 5%, humic acids acid amides 5%, calcium hydroxide 1%, tetradecanoic acid 1%, stearic acid 1%, limestone powder 18%.
Embodiment 15:
Fundamental property after oil base drilling fluid heat is rolled is measured.According to the oil base drilling fluid formula described in embodiment 1 to 14, prepare successively 14 kinds of oil base drilling fluids, and be numbered respectively 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, 11#, 12#, 13#, 14#.Compound method is that directly mixing is composite.The heat condition of rolling that the present embodiment is set is: heat is rolled 150 DEG C of temperature, and heat is rolled time 16h, 50 DEG C of probe temperatures, and the experimental temperature of HTHP FL is 150 DEG C.14 kinds of oil base drilling fluids fundamental property measurement result after heat is rolled is as shown in table 1.In table 1, AV represents apparent viscosity; PV represents plastic viscosity; YP represents yield value; HTHP FL represents High Temperature High Pressure filter vector (using high temperature and high pre ssure filtration determinator, is 3.5MPa measuring pressure reduction, and the filter loss that Measuring Time is 30min is multiplied by 2 result); ES represents emulsion-breaking voltage.
Performance measurement result after 14 kinds of oil base drilling fluid heat of table 1 are rolled
The rheological of drilling fluid refers to that the characteristic that flows and be out of shape occurs drilling fluid under external force.Apparent viscosity, plastic viscosity, yield value are the important parameters for describing drilling fluid rheology, and the fundamental property that the present embodiment has carried out after hot rolling 14 kinds of drilling fluids is measured.As seen from Table 1,14 kinds of drilling fluid rheology parameters all can meet the requirement of wellbore construction, and wherein the rheological parameter of 12# drilling fluid is lower, illustrate that the rheological property of 12# drilling fluid is comparatively excellent.It should be noted that, the High Temperature High Pressure filter vector minimum of 12# drilling fluid, reflects that it is not prone to leakage phenomena in wellbore construction process.The stability of the high low reaction drilling fluid of emulsion-breaking voltage, as seen from Table 1, the emulsion-breaking voltage of 14 kinds of drilling fluids is all higher, and especially the emulsion-breaking voltage of 12# drilling fluid reaches 1320V, illustrates that 12# drilling fluid system is difficult for breakdown of emulsion, and system suspension property is good.
By the present embodiment, can filter out 12# drilling fluid over-all properties outstanding, the formula of 12# drilling fluid is: each components based on weight percentage, 3# white oil 60%, wetting agent 2%, CaCl 2salt solution 6%, calcium dodecylbenzene sulphonate 3%, humic acids acid amides 4%, calcium hydroxide 2%, isocaprylic acid aluminium 1%, stearic acid 2%, barite 20%.
Embodiment 16:
The native pollution capacity experiment of the anti-poor quality of oil base drilling fluid.Evaluate the pollution capacity of the anti-soil inferior of the oil base drilling fluid (being the 12# drilling fluid in embodiment 15) of the compound method preparation that adopts embodiment 12, in the present embodiment, set toward 12# drilling fluid and add the amount of matter soil to account for 0%, 5%, 10%, 15%, 20% of drilling fluid system total amount.
The aging condition of the present embodiment is that 150 DEG C, digestion time are 16h, HTHP FL(High Temperature High Pressure filter vector) experimental temperature is 150 DEG C, experimental result is in table 2.In table 2, AV represents apparent viscosity; PV represents plastic viscosity; YP represents yield value; HTHP FL represents High Temperature High Pressure filter vector; ES represents emulsion-breaking voltage.
The native pollution capacity of anti-poor quality of table 2 12# oil base drilling fluid
Find out from experimental result table 2, along with soil inferior in drilling fluid is invaded the increase of dosage, the apparent viscosity of this drilling fluid, plastic viscosity, yield value, High Temperature High Pressure filter vector all increase gradually, emulsion-breaking voltage reduces gradually, but from overall performance, this drilling fluid has the native pollution capacity of good anti-poor quality, can meet the requirement of wellbore construction.
The present invention has been done to further narration above, but the present invention is not limited to above-mentioned embodiment in conjunction with the embodiments, in the ken that one skilled in the relevant art possesses, can also under the prerequisite that does not depart from aim of the present invention, makes a variety of changes.

Claims (9)

1. an oil base drilling fluid, comprises base oil, CaCl 2salt solution, emulsifying agent, fluid loss agent, calcium hydroxide, carry and cut agent, tackifier and high-density weighting material, it is characterized in that also including the wetting agent taking plant Stockholm tar and vegetable oil acid as component, by weight percentage, this drilling fluid is by described wetting agent 1% ~ 3%, base oil 50% ~ 80%, CaCl 2salt solution 5% ~ 10%, emulsifying agent 2% ~ 5%, fluid loss agent 3% ~ 6%, calcium hydroxide 0.5% ~ 3%, carry and cut agent 0.3% ~ 2%, tackifier 0.5% ~ 3%, high-density weighting material surplus composition; Described CaCl 2the mass percentage concentration of salt solution is 32%.
2. oil base drilling fluid according to claim 1, is characterized in that: plant Stockholm tar and vegetable oil acid in described wetting agent, and by weight percentage, plant Stockholm tar accounts for 60% of wetting agent total amount, and vegetable oil acid accounts for 40% of wetting agent total amount.
3. full oil base drilling fluid according to claim 1, is characterized in that: described base oil is any in 3# white oil, 0# diesel oil, gas liquefaction Saraline 185V.
4. oil base drilling fluid according to claim 1, is characterized in that: described emulsifying agent is any in calcium mahogany sulfonate, barium mahogany sulfonate, calcium dodecylbenzene sulphonate, hexadecyl ammonio methacrylate, SPAN-80.
5. oil base drilling fluid according to claim 1, is characterized in that: described fluid loss agent is oxidized bitumen or humic acids acid amides.
6. oil base drilling fluid according to claim 1, is characterized in that: described in carry that to cut agent be tetradecanoic acid or isocaprylic acid aluminium.
7. oil base drilling fluid according to claim 1, is characterized in that: described tackifier are stearic acid or aluminum stearate.
8. oil base drilling fluid according to claim 1, is characterized in that: described high-density weighting material is any in barite, powdered iron ore, limestone powder, four manganese oxide.
9. according to the oil base drilling fluid described in claim 1 to 9 any one, it is characterized in that: by weight percentage, this drilling fluid is by wetting agent 2%, 3# white oil 60%, CaCl taking plant Stockholm tar and vegetable oil acid weight ratio as 60/40 2salt solution 6%, calcium dodecylbenzene sulphonate 3%, humic acids acid amides 4%, calcium hydroxide 2%, isocaprylic acid aluminium 1%, stearic acid 2%, barite 20% form; Described CaCl 2the mass percentage concentration of salt solution is 32%.
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CN104610946A (en) * 2014-12-11 2015-05-13 中国石油大学(北京) Superfine oil-base drilling fluid used for high temperature high temperatur high pressure superdeep well and preparation method thereof
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CN106318351A (en) * 2015-06-16 2017-01-11 中石化石油工程技术服务有限公司 Clay-free phase water-in-oil drilling fluid and preparation method thereof
CN105038734A (en) * 2015-08-18 2015-11-11 中国石油集团川庆钻探工程有限公司工程技术研究院 Shear strength improving agent for oil-based drilling fluid and preparation method of shear strength improving agent
CN105733530A (en) * 2016-01-27 2016-07-06 中国石油集团川庆钻探工程有限公司工程技术研究院 Low-viscosity high-shear high-density oil-base drilling fluid
CN107779182A (en) * 2016-08-29 2018-03-09 中国石油化工股份有限公司 A kind of gas liquefaction synthetic base drilling fluid
CN110105931A (en) * 2019-05-06 2019-08-09 滨州学院 A kind of oil base drilling fluid and preparation method thereof based on modified castor oil

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