Solid polyalcohol in use for drilling fluid

A drilling fluid and polyol composition technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as inconvenient feeding, foaming, poor performance of drilling fluid, etc.

Inactive Publication Date: 2008-07-02
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although many achievements have been made in the research of polyols, the polymeric alcohols used now are all in liquid form, and the polyols in this liquid form have also caused many problems. Convenient, high transportation cost; inconvenient and easy to waste materials; high viscosity; inevitable foaming during use, resulting in poor drilling fluid performance and other problems

Method used

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  • Solid polyalcohol in use for drilling fluid
  • Solid polyalcohol in use for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Composition: The mass ratio of polyethylene glycol PEG6000, polyoxyethyl ether L61 and calcium lignosulfonate is 2:1:2.

[0047] Preparation method: first mix L61 and calcium lignosulfonate; then crush PEG6000 into particles that are good for flow; finally mix the mixed L61 and calcium lignosulfonate with crushed PEG6000, and then fully stir, then it is ready .

[0048] It is added to the drilling fluid at an additive amount of 2%. After testing, all indicators are qualified.

Embodiment 2

[0050] Composition: The mass ratio of polyethylene glycol PEG6000, polyoxyethyl ether L61 and calcium lignosulfonate is 2.05:1:2.

[0051] Preparation method: first mix L61 and calcium lignosulfonate; then crush PEG6000; finally mix the mixed L61 and calcium lignosulfonate with crushed PEG6000, and then fully stir.

[0052] It is added to the drilling fluid at an additive amount of 3%. After testing, all indicators are qualified.

Embodiment 3

[0054] Composition: The mass ratio of polyethylene glycol PEG6000, polyoxyethyl ether L61, and calcium lignosulfonate is 1.95:1:2.05.

[0055] Preparation method: first mix L61 and calcium lignosulfonate; then crush PEG6000; finally mix the mixed L61 and calcium lignosulfonate with crushed PEG6000, and then fully stir.

[0056] After testing, all indicators are qualified.

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Abstract

This invention provides solid polyol used in drilling fluid. The solid polyol is composed of: poly (ethylene glycol) (average molecular weight is 5500-7500), poly (oxyethylene ether) L61 and calcium lignosulfonate at a weight ratio of (1.95-2.05) :( 0.95-1.05) :( 1.95-2.05). The solid polyol solves the problems of difficult packaging; inconvenient addition and high transportation cost faced by present liquid polyol used in drilling fluid, and does not increase the viscosity or foam. This invention also provides a method for preparing the solid polyol used in drilling fluid. The method comprises: adequately mixing poly (ethylene glycol), poly (oxyethylene ether) L61 and calcium lignosulfonate according to the above ratio.

Description

technical field [0001] The invention relates to a treatment agent commonly used for water-based drilling fluids in the drilling industry, in particular to solid polyols for drilling fluids. In addition to the advantages of the known liquid polymeric alcohols for drilling fluids, the solid polyols also overcome liquid In addition to the disadvantages of special packaging, inconvenient loading and unloading and feeding, high transportation costs and easy waste, polymeric alcohol also has the advantages of no viscosity increase and no foaming. Background technique [0002] During oil and gas exploration and development, 60-80% of the formations encountered are shale or shale-like formations. The shale formation is characterized by water absorption and expansion, which makes drilling engineering encounter many insurmountable difficulties. From the current point of view, the most feasible way to solve this problem is to improve the performance of drilling fluid. [0003] In the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12C08L71/08
Inventor 郑力会
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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