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Low specific gravity high performance wall retaining mud material for medium and long horizontal freezing drilling in silty clay and preparation method

A frozen drilling and silty technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of frozen hole collapse, drill bit deviation, etc., to reduce impact, save cooling capacity, reduce disturbance and The effect of soil erosion

Active Publication Date: 2022-04-05
BEIJING CHINA COAL MINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to set out from the mechanism of horizontal freezing drilling mud retaining wall, considering that the mud cake formed is thin and tough, a kind of low specific gravity high performance mud retaining material and preparation method are proposed to solve the problem of long horizontal During the freezing drilling process, the drill bit deviation at the interface between soft and hard formations and the freezing hole collapse after the drilling tool is pulled out

Method used

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  • Low specific gravity high performance wall retaining mud material for medium and long horizontal freezing drilling in silty clay and preparation method
  • Low specific gravity high performance wall retaining mud material for medium and long horizontal freezing drilling in silty clay and preparation method
  • Low specific gravity high performance wall retaining mud material for medium and long horizontal freezing drilling in silty clay and preparation method

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Embodiment 1

[0037] In this embodiment, a low-specific-gravity high-performance wall protection mud material used for long horizontal freezing drilling in silty clay is composed of basic components and external components. The index of the mud material is: the water loss of the mud is less than 15mL, Specific gravity < 1.05, mud viscosity 20s ~ 50s.

[0038] The basic component is bentonite slurry formed by sodium-based bentonite and water, adding soda ash to the bentonite slurry to make the pH value of the bentonite slurry 9.0-10.0; the external component is composed of polyacrylamide and carboxymethyl cellulose. The basic component is a bentonite slurry formed by sodium-based bentonite and water. Taking water as a reference, the admixture of sodium-based bentonite is 2% to 5% of the mass of water. Adding soda ash to the bentonite slurry makes the pH value of the bentonite slurry 9.0 to 10.0; the external blending component is composed of polyacrylamide and carboxymethyl cellulose, the ad...

Embodiment 2

[0041] In this embodiment, a method for preparing a low-specific-gravity high-performance retaining wall mud material for long horizontally frozen drilling in silty clay comprises the following steps:

[0042] (1) Determine the main control indicators: In view of the need to form a high-performance mud cake on the mud wall for long horizontal drilling in silty clay: (a) solve the problem of bit deviation at the interface between soft and hard formations during drilling; (b) drill pipe It takes more than 9 hours to pull out and lower the frozen pipe, and the drilling is in a state of underpressure balance (such as figure 1 As shown), it is necessary to form a balanced system with the thin film support body of mud cake and the surrounding small-pore formation, so as to reduce the hole collapse phenomenon that may occur during the pulling out of the drilling tool and the lowering of the frozen pipe.

[0043] From the perspective of experimental research, a test index suitable for...

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Abstract

The invention discloses a low-specific-gravity high-performance wall protection mud material for long horizontal freezing drilling in silty clay and a preparation method. The mud material is composed of basic components and externally mixed components. The control index of the mud material is: the water loss of the mud <15mL, mud specific gravity <1.05, mud viscosity 20s~50s. The preparation method comprises the following steps: (1) determining the control index, (2) screening the basic formula, (3) testing and testing, (4) orthogonal testing, (5) testing and checking, (6) determining the basic component and the externally mixed group The distribution ratio. The wall protection mud material of the present invention forms a mud cake at the interface between soft and hard formations, which well supports the stability of the borehole wall, and controls the offset of the interface between soft and hard formations to keep it within 3‰. After the drill pipe is pulled out, the mud, mud cake, air and the borehole form an underpressure balance system in the borehole. This balance system can maintain stability for a long time, maintaining the stability of the borehole for more than 9 hours, and realizing the smooth release of the frozen pipe.

Description

technical field [0001] The invention relates to the technical field of civil engineering. Specifically, it relates to a low-specific-gravity high-performance retaining wall mud material for long horizontal freezing drilling in silty clay and a preparation method thereof. Background technique [0002] The development of urban underground space is an important measure to solve the crisis of urban resources and environment. With the acceleration of urbanization in our country, especially in the past 10 years, the problem of urban traffic congestion has become more and more prominent, and the construction of subways has become one of the most effective ways to solve the problem of urban traffic congestion. Therefore, along with the development of the urbanization process, the scale and speed of rail transit construction in the past 20 years are rare in the world. As of the end of 2017, the total mileage of rail transit in mainland my country has reached 4,712 kilometers, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508
CPCC09K8/508
Inventor 姜国静李方政高伟郭垒崔兵兵崔灏孙建荣王康刘冰
Owner BEIJING CHINA COAL MINE ENG CO LTD
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