Invert-emulsion drilling fluid, preparation method and application thereof

A drilling fluid and inverse emulsification technology, used in chemical instruments and methods, earth-moving drilling, flushing wells, etc., can solve the problems of high viscosity and plastic viscosity, low dynamic shear force and static shear force, etc., and achieve good biodegradation. properties, improve shear force, and promote the effect of drilling speed

Active Publication Date: 2014-11-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the objects of the present invention is to provide an inverse emulsification drilling fluid, which solves the problem that the domestic existing inverse emulsification drilling fluid funnel viscosity and plastic viscosity are too high, while the dynamic shear force and static shear force are too low, so as to ensure the solid phase in the drilling fluid Suspension stability ensures the wellbore cleanliness and downhole safety of extended-reach wells or long horizontal wells, and promotes the improvement of drilling speed in complex formations

Method used

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  • Invert-emulsion drilling fluid, preparation method and application thereof
  • Invert-emulsion drilling fluid, preparation method and application thereof
  • Invert-emulsion drilling fluid, preparation method and application thereof

Examples

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preparation example

[0038] (1) The waste oil used in the preparation example is rapeseed oil residue (produced by Zhangbei Xixiang Vegetable Oil Purchase and Sales Co., Ltd.), animal oil foot (produced by Hebei Jiajie Oil Co., Ltd.) and restaurant swill oil (collected in the unit restaurant).

[0039] (2) The saponification of the waste oil used in the preparation example is prepared as follows:

[0040] ① Heat a mixture of 100 parts of rapeseed oil residue and 100 parts of calcium oxide and calcium hydroxide (the weight ratio of the two is 3:1) to 65°C, react under stirring conditions for 8 hours, and cool to obtain rapeseed oil saponification.

[0041] ②Heat the mixture of 100 parts of animal oil feet and 10 parts of sodium hydroxide and potassium hydroxide (the weight ratio of the two is 1:1) to 190°C, react under stirring conditions for 1 hour, and cool to obtain the saponification of animal oil feet things.

[0042] ③ Heat 100 parts of restaurant swill oil and 50 parts of calcium oxide to ...

Embodiment 1

[0054] (1) The weight volume content of each component in the inverse emulsified drilling fluid is as follows:

[0055] Base Oil: 75%; Brine: 25%; Emulsifier: 3%; Wetting Agent: 0.2%; Lipophilic Colloid: 3%; Fluid Loss Control Agent: 3%; Shear Lifting Agent: 1%; Alkalinity Regulator : 4%; weighting agent: 0%.

[0056] Among them, the base oil is a mixture of No. 0 diesel oil and No. 5 white oil (both produced by Sinopec Yanshan Petrochemical), and the volume ratio of the two is 1:2; the brine is calcium acetate brine with a mass fraction of 5%; the emulsifier is prepared from The emulsifier 1 that example obtains; Wetting agent adopts tetradecyltrimethylammonium bromide; Lipophilic colloid adopts organic soil; Fluid loss reducer adopts humic acid amide; The mixture, the weight ratio of the two is 1:5; the alkalinity regulator adopts calcium oxide.

[0057] The specific preparation method is as follows:

[0058] (2) The preparation process of the inverse emulsified drilling ...

Embodiment 2

[0063] The weight volume content of each component in the inverse emulsified drilling fluid is as follows:

[0064] Base Oil: 60%; Brine: 40%; Emulsifier: 4%; Wetting Agent: 0.2%; Lipophilic Colloid: 3%; Fluid Loss Control Agent: 4.8%; Shear Lifting Agent: 1%; Alkalinity Regulator : 4%; Weighting agent: 37%.

[0065] Wherein, the base oil adopts No. 0 diesel oil (produced by Sinopec Yanshan Petrochemical); the brine adopts the calcium chloride brine with a mass fraction of 20%; the emulsifier adopts the emulsifier 2 obtained in the preparation example; A mixture of sodium bis(2-ethylhexyl)sulfonate and sodium bis(2-ethylhexyl)sulfonate, the weight ratio of the two is 1:2; the lipophilic colloid is made of organic soil; the fluid loss control agent is made of oxidized asphalt; the shear agent is made of polyethylene The propylene copolymer resin has a viscosity-average molecular weight of 8000; calcium hydroxide is used as the alkalinity regulator; calcium carbonate is used as...

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Abstract

The invention provides an invert-emulsion drilling fluid, which comprises basic oil, brine, an emulsifier, a wetting agent, lipophilic colloid, a fluid loss additive, a shearing potentiator, an alkalinity conditioning agent, and a weighting agent. The invert-emulsion drilling fluid has the characteristics of low funnel viscosity and plasticity viscosity, and high dynamic shearing force and static shearing force; the yield point / plastic viscosity ratio is more than or equal to 0.30, the drilling fluid can sustain a temperature as high as 200 DEG C, so the drilling fluid is suitable for being used in a high temperature deep well, and a plurality of oils such as diesel oil, white oil, gas-liquefied oil, and the like can be used to carry out construction. Solved are the technical problems that the funnel viscosity and plasticity viscosity of the conventional invert-emulsion drilling fluid system are too high, and the dynamic shearing force and the static shearing force are too low.

Description

technical field [0001] The invention relates to an inverse emulsified drilling fluid and its preparation method and application, belonging to the field of oil and gas field development. Background technique [0002] Inverted emulsification drilling fluid is a kind of drilling fluid with water as the dispersed phase and base oil as the continuous phase. It has many advantages such as strong inhibition, excellent lubricity, good for wellbore stability and protection of oil and gas layers. It is an effective means and widely used in foreign drilling process. Due to the high cost of base oil in China, the use and development of inverse emulsion drilling fluid is severely restricted. Compared with the advanced inverse emulsification drilling fluid system abroad, the rheological properties of the inverse emulsification drilling fluid currently used in China are generally insufficient. Specifically, under the condition of the same density, the funnel viscosity and plastic viscosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/36E21B21/00
CPCC09K8/36C09K2208/02E21B21/00
Inventor 路保平林永学王显光何恕韩秀贞李舟军李雄李胜
Owner CHINA PETROLEUM & CHEM CORP
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