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Drilling slurry for coring of highly loose stratums as well as preparation method and application of drilling slurry

A loose, formation technology, applied in the direction of chemical instruments and methods, drilling composition, etc., can solve the problems of low harvest rate of coring, improve the harvest rate, enhance dynamic shear force and static shear force, and improve the adjustment effect. Effect

Inactive Publication Date: 2020-02-28
CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide drilling slurry for coring in high loose formations, to solve the problem that the existing SM plant glue is used for coring in high loose formations, resulting in low coring yield

Method used

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  • Drilling slurry for coring of highly loose stratums as well as preparation method and application of drilling slurry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The thickness of the drilled loose overburden in this embodiment is about 63m, and the formation lithology is silty clay, loose gravel soil, etc. The upper formation is easy to absorb water and swell, causing the diameter of the hole to shrink and the hole wall to collapse. The drilling slurry is configured to meet the construction requirements of the upper formation.

[0032] The first step is to configure the slurry, the formula is: fresh water + 0.2% NaOH + 0.2% Na 2 CO 3 +10% bentonite, fully hydrated for 24 hours after preparation, and fully stirred during the hydration process to prevent precipitation; the second cloth is equipped with glue, the formula is: 0.1% NaOH + 0.1% Na 2 CO 3 +0.6% MMH (positive gel) + 0.4% JMP-1 + 0.4% K-HPAN (polyacrylonitrile-potassium salt) + 0.8% NH 4 -HPAN (polyacrylonitrile complex ammonium salt), fully hydrated.

[0033] When drilling and coring, put the slurry into the hole first, replenish the glue in time during the drilling...

Embodiment 2

[0036] The thickness of the drilled loose overburden in this embodiment is about 58m, and the formation lithology is silty clay, sand and the like. The upper formation is easy to absorb water and swell, causing the diameter of the hole to shrink and the hole wall to collapse. Shallow groundwater contaminates drilling fluid.

[0037] The drilling slurry is configured to meet the construction requirements, and the formula is: fresh water + 0.2% NaOH + 0.2% Na 2 CO 3 +10% bentonite for full hydration for 24 hours. Configure glue, the formula is: 0.2%NaOH+0.2%Na 2 CO 3 +0.6% MMH (positive gel) + 0.4% JMP-1 + 0.4% K-HPAN (polyacrylonitrile-potassium salt) + 0.8% NH 4 -HPAN (polyacrylonitrile complex ammonium salt), fully hydrated.

[0038] When drilling and coring, put the slurry into the hole first, replenish the glue in time during the drilling and coring process, and gradually add glue to the hole until the glue is used up, so as to improve the stability of the drilling sl...

Embodiment 3

[0041] This embodiment is based on embodiment 1, and the difference with embodiment 1 is:

[0042] The first step is to configure the slurry, the formula is: fresh water + 0.1% NaOH + 0.1% Na 2 CO 3 +5% bentonite, fully hydrated for 24 hours after preparation, and fully stirred during the hydration process to prevent precipitation; the second cloth is equipped with glue, the formula is: 0.1% NaOH+0.1% Na 2 CO 3 +0.5% MMH (positive gel) + 0.3% JMP-1 + 0.3% K-HPAN (polyacrylonitrile-potassium salt) + 0.5% NH 4 -HPAN (polyacrylonitrile complex ammonium salt), fully hydrated.

[0043]After the final hole, the harvest rate of coring is counted, and the harvest rate can reach 81%.

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Abstract

The invention discloses a drilling slurry for coring of highly loose stratums as well as a preparation method and application of the drilling slurry. The drilling slurry is prepared from the followingcomponents in percentage by mass: 5%-10% of bentonite, 0.2%-0.5% of caustic soda, 0.2%-0.5% of sodium carbonate, 0.5%-0.8% of a cationic colloid, 0.3%-0.5% of a fluid loss agent, 0.3%-0.5% of a polyacrylonitrile-potassium salt, 0.5%-1% of a polyacrylonitrile composite ammonium salt and the balance water. When the formula provided by the invention is used for coring highly loose stratums, the yield can reach 80-90%, and compared with the prior art, the yield is obviously improved.

Description

technical field [0001] The invention relates to the technical field of engineering drilling, in particular to a drilling slurry used for coring in high-consolidation formations and a preparation method and application thereof. Background technique [0002] At present, in the field of hydropower engineering drilling, whether it is overburden coring or bedrock coring, the traditional drilling slurry is made of SM vegetable glue material. The advantages of SM vegetable glue are mainly to increase viscosity, reduce water loss and improve lubricity The effect of drag reduction has obvious disadvantages. There is no means for formations with large leakage, and for formations with strong water sensitivity, it is difficult to control the increase of water loss and viscosity with a single SM vegetable glue, and for the loose accumulation of Quaternary In terms of layer or artificially filled soil formation (highly loose formation), the conventional vegetable gum drilling slurry has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/03C09K8/24C09K8/508
CPCC09K8/03C09K8/24C09K8/5083C09K2208/12
Inventor 龙伟程金晶王广巍梁宇陈淑芬
Owner CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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