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Plant oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid and vegetable oil technology, applied in the field of petroleum exploration, can solve the problems of high cost of oily drilling cuttings, low toxicity of gas-to-oil drilling fluid, and direct discharge of drilling cuttings, etc., and achieve good water resistance and emulsion stability Good, high temperature and high pressure low filtration effect

Inactive Publication Date: 2015-04-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

② The cost of oily drilling cuttings treatment is high
Mineral oil-based drilling fluids are much better than diesel-based drilling fluids in terms of health and safety, but the treatment measures for oily cuttings are the same and cannot be discharged directly
Gas-to-oil drilling fluid has low toxicity and has passed most of the toxicity tests. It has little impact on the environment, and the drill cuttings produced can be directly discharged in some sea areas. However, because it is difficult to biodegrade, EPA and other organizations restrict gas-to-oil drilling More stringent restrictions have been added to prevent its cuttings from being discharged directly in certain sea areas

Method used

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  • Plant oil-based drilling fluid and preparation method thereof
  • Plant oil-based drilling fluid and preparation method thereof
  • Plant oil-based drilling fluid and preparation method thereof

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Effect test

Embodiment 1

[0026] The present embodiment provides a kind of vegetable oil oil base drilling fluid, and this vegetable oil oil base drilling fluid comprises vegetable oil, salt solution, emulsifier, wetting agent, organic soil, fluid loss reducer; The volume ratio of vegetable oil and salt solution is 95: 5. Based on 100mL vegetable oil+salt solution: the content of emulsifier is 3.5g, the content of wetting agent is 0.5g, the content of organic soil is 2g, and the content of fluid loss control agent is 3g, of which:

[0027] Described vegetable oil is soybean oil, and salt solution is the calcium chloride solution of 20wt%;

[0028] The emulsifier is Span-80;

[0029] Described wetting agent is alkanol amide, and its general formula is RCON (CH 2 CH 2 Oh) 2 , where R=C 12 alkyl;

[0030] The organic soil is lipophilic clay, which is dispersed, purified and modified by montmorillonite, and the metal ions between the layers of montmorillonite are replaced with hexadecyltrimethylammoni...

Embodiment 2

[0036] This embodiment provides a vegetable oil-based drilling fluid, which comprises vegetable oil, salt solution, emulsifier, wetting agent, organic soil, fluid loss reducer, weighting agent; the volume ratio of vegetable oil to salt solution 95:5; based on 100mL vegetable oil+salt solution: the content of emulsifier is 3g, the content of wetting agent is 0.8g, the content of organic soil is 2g, and the content of fluid loss control agent is 3g, of which:

[0037] Described vegetable oil is rapeseed oil, and salt solution is the potassium formate solution of 20wt%;

[0038] Described emulsifier is calcium oleate;

[0039] The wetting agent is C 12 h 25 O(CH 2 CH 2 O) nH, n=8;

[0040]The organic soil is lipophilic clay, which is dispersed, purified and modified by montmorillonite, and the metal ions between the layers of montmorillonite are replaced with hexadecyltrimethylammonium chloride, so that the layer The spacing is expanded to 1.7-4.8nm to form a hydrophobic or...

Embodiment 3

[0047] This embodiment provides a vegetable oil-based drilling fluid, which comprises vegetable oil, salt solution, emulsifier, wetting agent, organic soil, fluid loss reducer, weighting agent; the volume ratio of vegetable oil to salt solution 80:20; based on 100mL vegetable oil+salt solution: the content of emulsifier is 3g, the content of wetting agent is 0.5g, the content of organic soil is 2g, and the content of fluid loss control agent is 3g, wherein:

[0048] Described vegetable oil is coconut oil, and salt solution is the sodium formate solution of 20wt%;

[0049] Described emulsifier is alkanol amide, and its general formula is RCON (CH 2 CH 2 Oh) 2 , where R=C 12 alkyl;

[0050] Described wetting agent is alkanol amide, and its general formula is RCON (CH 2 CH 2 Oh) 2 , where R=C 18 alkyl;

[0051] The organic soil is lipophilic clay, which is dispersed, purified and modified by montmorillonite, and the metal ions between the layers of montmorillonite are re...

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Abstract

The invention provides a plant oil-based drilling fluid and a preparation method thereof. The plant oil-based drilling fluid comprises plant oil, a saline solution and a treating agent, wherein the volume ratio of the plant oil to the saline solution is (80:20) to (95:5); the treating agent comprises an emulsifier, a wetting agent, organic soil and a filtrate reducer. Based on 100mL of plant oil and saline solution, the content of the emulsifier is 2.5-3.5g, content of the wetting agent is 0.5-0.8g, the content of the organic soil is 0.5-2g and content of the filtrate reducer is 3-5g; the density of the drilling fluid is 0.88-1.6g / cm<3>. As the selected base oil is plant oil in the natural biologic chain, the plant oil-based drilling fluid provided by the invention can be biodegraded and further has the advantages of good emulsion stability, low high-temperature and high-pressure filter loss and good water-resisting, soil-resisting, salt calcium-resisting and gypsum pollution-resisting capacities.

Description

technical field [0001] The invention relates to a vegetable oil-based drilling fluid and a preparation method thereof, belonging to the field of petroleum exploration. Background technique [0002] Drilling fluid refers to the circulating working fluid used in the drilling process. Drilling fluid with oil as the continuous phase is called oil-based drilling fluid. Oil-based drilling fluids are widely used in shale, high-temperature acidic formations, large salt-gypsum formations, extended-reach wells, etc. However, two factors restrict its use: ① Ordinary oil-based drilling fluid has high benzene ring content and high toxicity. It cannot be used in areas with sensitive environment or strict environmental regulations. ② The cost of oily drilling cuttings treatment is high. Strict environmental protection regulations and high cuttings disposal costs have promoted the development of low-aromatic and low-toxic mineral oil-based drilling fluids. Mineral oil-based drilling fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32
CPCC09K8/34
Inventor 张洁李英敏赵志良王双威杨海军李龙李爽
Owner BC P INC CHINA NAT PETROLEUM CORP
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