Drilling mud

A mud and base mud technology, applied in the field of drilling mud, can solve the problems of accurate control, difficult to achieve composition and performance indicators, etc., and achieve the effects of accurate control, reducing sand content and improving performance indicators.

Inactive Publication Date: 2018-05-15
NO 2 ENG CO LTD OF CCCC FIRST HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional mud preparation method is to directly select tap water and sodium-based bentonite to prepare mud, and it is difficult to accurately control the composition and performance indicators during the preparation process

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0027] Embodiments 1-3 provide a kind of mud for drilling respectively, and the base slurry includes the following components:

[0028] Sodium bentonite, parts by weight as described in table 1;

[0029] Water, parts by weight as described in Table 1;

[0030] Soda ash, used to adjust the pH value, appropriate amount;

[0031] Viscosity: 20~22; specific gravity: 3 ;Sand content rate98%;Water loss rate:<20%;Shear force: 2~4N;

[0032] In the base slurry, add the carboxylated styrene-butadiene latex of the weight portion as described in table 1, the PHP colloid of the base slurry of the amount as described in table 1 and an appropriate amount of soda ash to make drilling mud;

[0033]

[0034]

[0035] The pH is obtained by adjusting the pH with an appropriate amount of NaOH;

[0036] Viscosity: 26~35; specific gravity: 3 ; Sand content rate 100%; water loss rate: <20%; shear force: 4~6N.

Embodiment 4

[0038] This embodiment provides a preparation method of drilling mud,

[0039] S1: Configure the base slurry without PHP. The base slurry is made by mixing bentonite, soda ash and water. The fineness of sodium-based bentonite is less than 200 mesh, accounting for more than 98%. In the preparation process, water and bentonite are mixed first. Bentonite and water cannot be mixed into mud in the natural state, and must be stirred at a high speed to form a mud colloid. That is, a high-pressure water pump is installed in the slurry tank, and a homogeneous slurry is formed through multiple cycles of self-priming and back-spraying. It is also possible to add a certain amount of water to the pulper first, then add bentonite in proportion, and use the mechanical function of the pulper to perform high-speed rotation (1200-1500r / min) and stir for 10 minutes. After the bentonite particles are fully dispersed in water, add soda ash to the solution to adjust the specific gravity, viscosity...

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Abstract

The invention relates to drilling mud. Basic mud is firstly prepared, and then new mud is prepared, to obtain the drilling mud. The preparation method is simple; component and performance indexes arecontrolled accurately; various performance indexes of wall-protecting mud in a cast-in-situ bored pile construction process are improved favorably, and the quality of the mud is improved; a drill is relatively low in initial gel strength, so that the mud can discharge included gas easily, and the sand factor is reduced.

Description

technical field [0001] The invention relates to a drilling mud and belongs to the technical field of building construction. Background technique [0002] At present, the cast-in-place pile foundation is generally constructed by a rotary drilling rig, and the mud runs through the entire construction process of the bored cast-in-place pile. The drilling construction method of the rotary drilling rig is to drill under the protection of mud, and the drilling speed is fast. Due to the structure of the drilling rig, when the drill bit is drilling, each hole needs to be reciprocated multiple times. The main functions of the mud are: to protect the hole wall, depress the groundwater, and prevent the hole wall from collapsing; suspend the drilling slag and delay the settlement of the drilling slag. If the retaining mud is not well managed, accidents such as hole collapse may occur. Therefore, the performance index of the mud is an important factor affecting the quality of the hole a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24
Inventor 黄永亮周晨邢海龙
Owner NO 2 ENG CO LTD OF CCCC FIRST HIGHWAY ENG
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