Anti-collapse drilling fluid for coal seams, and preparation method thereof

A drilling fluid and anti-collapse technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well parts, etc., can solve the problems of poor applicability, achieve good rheology, wide application range of density, and inhibit plugging ability strong effect

Active Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for deep coal-bearing formations in deep wells and ultra-deep wells, the required drilling fluid has high density, good temperatur

Method used

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  • Anti-collapse drilling fluid for coal seams, and preparation method thereof
  • Anti-collapse drilling fluid for coal seams, and preparation method thereof
  • Anti-collapse drilling fluid for coal seams, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The drilling fluid includes the following components: 100 parts of tap water, 4 parts of drilling fluid sodium bentonite, Na 2 CO 3 0.2 parts, SMPFL-L 0.75 parts, SMJA-1 1 part, sulfonated material (SMC 2 parts, SMP-2 2 parts, SPNH 2 parts), FF-III 3 parts, SMGF-1 2 parts, SMNR-1 2 parts parts, 2 parts of SMPB-1, 11.5 parts of SMJH-1, some sodium hydroxide and barite.

[0041] The simplified drilling fluid treatment agent of the present embodiment is prepared by the following method:

[0042] Add 0.2 parts of Na to 100 parts of tap water 2 CO 3 After dissolving, add 4 parts of drilling fluid sodium-based bentonite and maintain for 24 hours, then add 0.75 parts of SMPFL-L, 2 parts of SMC, 2 parts of SMP-2, 2 parts of SPNH, 3 parts of FF-III, 1 part of SMJA-1, 2 parts of SMGF-1, 2 parts of SMNR-1, 2 parts of SMPB-1, 1.5 parts of SMJH-1 and 67 parts of barite, after fully dispersed and uniform, adjust the pH of the drilling fluid with sodium hydroxide to 10. Drilling ...

Embodiment 2

[0048] The drilling fluid includes the following components: 100 parts of tap water, 2 parts of drilling fluid sodium bentonite, Na 2 CO 3 0.1 part, SMPFL-L 0.5 part, SMJA-1 1 part, sulfonated material (SMC 2 parts, SMP-3 3 parts, SPNH 2 parts), FF-III 1.5 parts, SMNA-1 3 parts, SMGF-1 2 parts 2 parts of SMNR-1, 1 part of SMPB-1, 1 part of SMJH-1, some sodium hydroxide and barite.

[0049] The simplified drilling fluid treatment agent of the present embodiment is prepared by the following method:

[0050] Add 0.1 part of Na to 100 parts of tap water 2 CO 3 After dissolving, add 2 parts of drilling fluid sodium-based bentonite and maintain for 24 hours, then add 0.5 parts of SMPFL-L, 2 parts of SMC, 3 parts of SMP-3, 2 parts of SPNH, 1.5 parts of FF-III, 3 parts of SMNA-1, 1 part of SMJA-1, 2 parts of SMGF-1, 2 parts of SMNR-1, 1 part of SMPB-1, 1 part of SMJH-1 and 178 parts of barite, fully dispersed and evenly oxidized with hydrogen Sodium adjusts the pH of the drillin...

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Abstract

The invention provides an anti-collapse drilling fluid used for a coal seam and capable of drilling a coal-bearing stratum, and a preparation method thereof. The anti-collapse drilling fluid comprises100 parts of water, 1.0-6 parts of bentonite, 0.1-0.3 part of sodium carbonate, 0.25-7.5 parts of a filtrate reducer, 0.5-3 parts of a polyamine inhibitor, 2-8 parts of a sulfonated material, 1-5 parts of an asphalt material, 1-4 parts of a plugging agent, 1-6 parts of a lubricant and 0.5-5 parts of a shielding temporary plugging agent, wherein the pH value of the anti-collapse drilling fluid is9-10, and the density of the anti-collapse drilling fluid is 1.10-2.00 g/cm<3>. The drilling fluid has the characteristics of good rheological property, good lubricating property, strong inhibiting and plugging capability, wide density application range and the like, meets the requirements of well wall collapse prevention in stratum drilling such as crack development within 180 DEG C, low strengthand the like, and is particularly suitable for drilling collapse prevention of coal-mudstone interaction stratums.

Description

technical field [0001] The invention relates to the field of drilling fluids, in particular to an anti-collapse drilling fluid for coal seams and a preparation method thereof. Background technique [0002] During drilling operations, coal-bearing formations are often drilled, and coal seams are usually characterized by low strength, high brittleness, developed fractures, and loose cementation, which is a typical fractured formation. During drilling construction, external forces such as drilling fluid erosion, drill bit and drilling tool collision, etc. also make the coal rock easily broken and collapsed; in addition, the coal seam has developed cracks and prominent capillary action, which is easy to absorb water. After the drilling fluid filtrate enters, it will cause hydration. The reduction of its cementing force aggravates the instability of the formation; at the same time, the soluble cement between the cracks dissolves, which makes the coal seam lose its support and its...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/24C09K8/42C09K8/467C09K8/54
CPCC09K8/035C09K8/24C09K8/426C09K8/467C09K8/54C09K2208/12C09K2208/34C09K2208/32
Inventor 李雄金军斌董晓强林永学
Owner CHINA PETROLEUM & CHEM CORP
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