Organic soil for oil base drilling fluids with high yield value and preparation method thereof

An oil-based drilling fluid with high yield technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of low yield value of drilling fluid

Active Publication Date: 2014-09-03
ZHEJIANG FENGHONG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the defect that the yield value of the drilling fluid prepared by the existing organic soil is on the low side, and an object of the present invention is to provide a kind o...

Method used

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  • Organic soil for oil base drilling fluids with high yield value and preparation method thereof
  • Organic soil for oil base drilling fluids with high yield value and preparation method thereof
  • Organic soil for oil base drilling fluids with high yield value and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Disperse Anji calcium-based bentonite raw ore powder in fresh water or deionized water for beating;

[0029] (2) Add 3.5% NaF of soil amount and stir for 1~2 hours. Remove impurities by a horizontal centrifuge. The separated suspension is passed through a disc centrifuge to further remove impurities to obtain a sodium-based montmorillonite suspension;

[0030] (3) Heat the sodium-based montmorillonite suspension to 80°C while stirring, keep it warm for 1 hour, adjust the pH of the suspension to pH=3.5 with sulfuric acid, and continue stirring for 1 hour;

[0031] (4) Add sodium-based montmorillonite cation exchange capacity ( CEC ) 1.0 times of octadecyl dimethyl benzyl ammonium chloride, continue to stir and react for 1 hour;

[0032] (5) At the same time, add sodium-based montmorillonite cation exchange capacity ( CEC ) of 0.1 times bis(tallow ethyl amide) polyethoxymethyl ammonium methyl sulfate and 0.1 times CEC Stearic acid, continue stirring reaction 0.5~...

Embodiment 2

[0035] The alkyl quaternary ammonium salt cationic surfactant in step (4) in Example 1 is replaced by octadecyltrimethylammonium chloride, and the addition is 0.9 times CEC . Other steps are the same as in Example 1.

Embodiment 3

[0037] The quaternary ammonium salt cationic surfactant with strong polar groups in step (5) in Example 1 is replaced by octadecyl dihydroxyethyl ammonium chloride, and the addition is adjusted to 0.15 times CEC . Other steps are the same as in Example 1.

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Abstract

The invention relates to organic soil for oil base drilling fluids with a high yield value. The organic soil is formed by reacting montmorillonite, an alkyl quaternary ammonium salt surfactant, a quaternary ammonium salt cationic surfactant with a strong polar group and an anionic surfactant with a long chain alkyl group, wherein the input amount of the alkyl quaternary ammonium salt surfactant is 0.6-1.5 times of a sodium-based montmorillonite cation exchange capacity; the input amount of the quaternary ammonium salt cationic surfactant with the strong polar group is 0.01-0.5 times of the sodium-based montmorillonite cation exchange capacity; the molar ratio of the anionic surfactant with the long chain alkyl group to the quaternary ammonium salt cationic surfactant with the strong polar group is 1 to 1. According to the organic soil for oil base drilling fluids, the drilling fluids prepared by mineral oil has high yield value and can keep stable after being aged at high temperature.

Description

technical field [0001] The invention relates to the field of organic soil for oil-based drilling fluid, in particular to organic soil for preparing oil-based drilling fluid with high yield value and a preparation method thereof. Background technique [0002] Oil-based drilling fluid refers to the drilling fluid with oil as the continuous phase. Compared with water-based drilling fluid, organic drilling fluid has high temperature resistance, salt intrusion resistance, calcium intrusion resistance, good borehole wall stability, good lubricity and oil and gas Layer damage is less and many other advantages. At present, it has become an important means of drilling difficult high-temperature deep wells, high-deviation directional wells, horizontal wells and various complex formations, and can also be widely used as unblocking fluid, shooting completion fluid, workover fluid and coring fluid wait. In order to increase drilling speed and save cost, water-in-oil emulsified drillin...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/32
CPCC09K8/035C09K8/32
Inventor 宋海明李静静林鸿福王春伟周泽雄陈杰赵艳廖永明
Owner ZHEJIANG FENGHONG NEW MATERIAL
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