Method for evaluating shale hydration inhibition capability of water-based drilling fluid

A water-based drilling fluid and mud shale hydration technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of easily reducing the accuracy of test results, too much influence of stirring time and stirring rate, etc., to prevent well wall instability, reduce drilling costs, and improve safety
CN112903907APending Publication Date: 2021-06-04PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2021-06-04

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Abstract

The invention provides a method for evaluating shale hydration inhibition capability of water-based drilling fluid, and belongs to the field of shale gas development. The method comprises the following steps: providing a dry shale sample, and testing the lattice interlayer spacing d001 of the dry shale sample; adding quantitative dried shale samples and to-be-evaluated water-based drilling fluid into a reaction flask, stirring at a set temperature, and carrying out centrifugal treatment; collecting hydrated precipitates of the shale sample, and testing the lattice interlayer spacing d001 of the hydrated precipitates; obtaining the difference value [delta]d001 and comparing the difference value with an evaluation standard, and judging the strength of the shale hydration inhibition capacity of the to-be-evaluated water-based drilling fluid; the evaluation standard being as follows: 0.22 > = [delta]d001 > 0, and the shale hydration inhibition capability being strong; 0.5 > = [delta]d001 > 0.22, and the shale hydration inhibition capacity being high; 0.7 > = [delta]d001 > 0.5, and the shale hydration inhibition capability being weak; 1 > = [delta]d001 > 0.7, and the shale hydration inhibition capability being weak.
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Description

Technical field

[0001] The present invention relates to the field of shale gas development, and more particularly to a water-based drilling fluid inhibiting the evaluation method of hydration capacity of mud. Background technique

[0002] The mud shale is a rock formed by a stress and temperature of the clay, wherein there is a mix of stone, longite debris and other chemicals, and the mud shale is large, the pore is small, the structure is complicated, and it is easy to absorb water. When the water-based drilling fluid drill slut, the mud shale will hydrate in the water-based drilling fluid, which has caused the stability loss of the mud shale formation wall, and the cause of fragmentation and even even the wall collapsed. . To prevent the unstable wall of the drill mud rock formation caused collapse, water-based drilling fluid on mud flour peaks should have strong inhibitory capabilities.

[0003] Currently, the laser particle size method is used to evaluate the inhibitory capac...

Claims

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