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Modified fatty acid type primary emulsion for high-temperature-resistant oil based drilling fluid and preparation method of modified fatty acid type primary emulsion

A technology of oil-based drilling fluid and fatty acids, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of ineffective adsorption of free oil phase, easy decomposition, lack of high temperature and high pressure filtration loss of oil-based drilling fluid Quantity and other issues, to achieve the effect of great practical value, easy operation, stable rheology

Active Publication Date: 2016-02-10
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

[0004] However, there are many shortcomings in the above, mainly in the following aspects: sorbitan fatty acid ester emulsifiers are easily decomposed and invalidated under high temperature conditions, especially in the alkaline environment of oil-based drilling fluid; fatty acid emulsifiers It has obvious high-temperature thickening phenomenon, which makes the viscosity of oil-based drilling fluid exceed the reasonable range at high temperature, especially oleic acid; neither sorbitan fatty acid ester nor fatty acid emulsifier can effectively absorb oil-based drilling fluid The free oil phase lacks the effect of reducing the high temperature and high pressure filtration loss of oil-based drilling fluid

Method used

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  • Modified fatty acid type primary emulsion for high-temperature-resistant oil based drilling fluid and preparation method of modified fatty acid type primary emulsion

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Effect test

Embodiment 1

[0025] A modified fatty acid main emulsifier for high temperature resistant oil-based drilling fluid, which consists of the following components: dibasic acid anhydride, fatty acid and epichlorohydrin, wherein the mass ratio of dibasic acid anhydride to fatty acid is 1:20-1 :30, epichlorohydrin is 15-25% of fatty acid mass.

[0026] The dibasic acid anhydride is one of malonic anhydride, maleic anhydride, succinic anhydride, glutaric anhydride and adipic anhydride.

[0027] The fatty acid is a mixture of oleic acid and linoleic acid, and the mixing mass ratio is 1:1~1.5:1.

[0028] A method for preparing a modified fatty acid main emulsifier for high temperature resistant oil-based drilling fluid, comprising: dibasic acid anhydride, fatty acid and epichlorohydrin are obtained through addition reaction, wherein the mass ratio of dibasic acid anhydride to fatty acid is 1 :20~1:30, epichlorohydrin is 15~25% of fatty acid mass.

[0029] Described preparation method specifically ...

Embodiment 2

[0036] The invention provides a high temperature resistant oil-based drilling fluid modified fatty acid main emulsifier, which is obtained by addition reaction of epichlorohydrin, fatty acid and dibasic acid anhydride, wherein the fatty acid is a mixture composed of oleic acid, linoleic acid Acid composition; binary acid anhydride is one of malonic anhydride, maleic anhydride, succinic anhydride, glutaric anhydride, adipic anhydride.

[0037] The present invention also provides a preparation method of a high temperature resistant oil-based drilling fluid modified fatty acid main emulsifier, specifically as follows:

[0038] 1. Add dibasic acid anhydride and fatty acid into a three-necked flask at a mass ratio of 1:20 to 1:30, heat to 50°C in an oil bath, feed nitrogen for 10 minutes, and stir at a low speed for 30 minutes until they are evenly mixed;

[0039] 2. Slowly add epichlorohydrin with 20% fatty acid mass into the three-necked flask, add a condenser tube to the three-n...

Embodiment 3

[0059] This embodiment is basically the same as the above-mentioned embodiment, the main differences are as follows:

[0060] A modified fatty acid main emulsifier for high temperature resistant oil-based drilling fluid, which consists of the following components: dibasic acid anhydride, fatty acid and epichlorohydrin, wherein the mass ratio of dibasic acid anhydride to fatty acid is 1:20, and the ring Oxychloropropane is 15% of fatty acid mass.

[0061] The fatty acid is a mixture of oleic acid and linoleic acid, and the mixing mass ratio is 1:1.

[0062] A method for preparing a modified fatty acid main emulsifier for high temperature resistant oil-based drilling fluid, comprising: dibasic acid anhydride, fatty acid and epichlorohydrin are obtained through addition reaction, wherein the mass ratio of dibasic acid anhydride to fatty acid is 1 :20, epichlorohydrin is 15% of fatty acid quality.

[0063] Described preparation method specifically comprises the following steps: ...

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Abstract

The invention discloses a modified fatty acid type primary emulsion for high-temperature-resistant oil based drilling fluid and a preparation method of the modified fatty acid type primary emulsion. The modified fatty acid type primary emulsion for the high-temperature-resistant oil based drilling fluid consists of the following components: dicarboxylic anhydride, fatty acid and epoxy chloropropane, wherein the mass ratio of dicarboxylic anhydride to fatty acid is 1:20-1:30, and the mass of the epoxy chloropropane accounts for 15-25% of the mass of the fatty acid. The modified fatty acid type primary emulsion disclosed by the invention is obtained by modifying the fatty acid, has stronger emulsifying capacity and high temperature resistance, and has an effect of reducing the high-temperature high-pressure filtration losses of the oil based drilling fluid at the same time.

Description

technical field [0001] The invention relates to a modified fatty acid main emulsifier for high-temperature resistant oil-based drilling fluid and a preparation method thereof, which are mainly used in the oil and gas drilling industry. Background technique [0002] The main emulsifier used in water-in-oil drilling fluid is a surfactant with an HLB value between 3 and 6. Its main function is to reduce the interfacial tension of oil and water, disperse water into the oil uniformly and stably, and form a stable oil Water-in-emulsion. For water-in-oil drilling fluids, the primary emulsifier plays a vital role in the performance of the drilling fluid. [0003] At present, the main emulsifiers for oil-based drilling fluids commonly used in China are mainly sorbitan fatty acid esters and fatty acids. For example, a viscosifying emulsifier for oil-based drilling fluids and its preparation method disclosed in Chinese Patent Publication No. The date is 2015-03-25. The emulsifier inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/36
CPCC09K8/035C09K8/36
Inventor 万伟蒋官澄马光长杨野冯学荣邓宇蒋羿黎
Owner BC P INC CHINA NAT PETROLEUM CORP
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