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Low-solid-phase low-temperature polymer drilling fluid

A polymer and low-solid phase technology, applied in the field of drilling fluid, can solve the problems that the rheological properties of drilling fluid vary greatly with temperature, cannot adapt well to low-temperature environment, and cannot guarantee rheological properties, etc., and achieve good low-temperature rheological stability properties, improving low temperature rheological properties, and meeting performance requirements

Inactive Publication Date: 2015-11-04
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

During the application process, it was found that the rheological properties of this drilling fluid changed greatly with temperature, which affected the performance of the drilling fluid
[0004] The applicant has conducted research on common similar drilling fluids, and found that the drilling fluids in the prior art that use polymers, zwitterions, etc. caused by the dosage, but can not be well adapted to the low temperature environment at the microscopic level

Method used

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  • Low-solid-phase low-temperature polymer drilling fluid
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  • Low-solid-phase low-temperature polymer drilling fluid

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Experimental program
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Embodiment Construction

[0025] In order to illustrate the performance of the drilling fluid of the present invention, the applicant compares the performance of the drilling fluid of the present invention and the performance of drilling fluids with other compositions in the following examples.

[0026] In the following tests, the following materials were used: sodium bentonite, sodium hydroxide (NaOH), sodium chloride (NaCl), HT-101 (hereinafter referred to as HT, is a kind of amphoteric composite ionic multicomponent copolymer, which is a non-tackifying Type, product of Chengdu Shundali Company), FA-367 (hereinafter referred to as FA, is a water-soluble zwitterionic polymer, its relative molecular mass is 1 million-2.5 million, viscosity-increasing type, product of Chengdu Shundali Company), Carboxymethyl cellulose (CMC) selects low viscosity type (LV-CMC, the degree of polymerization is about 500), xanthan gum (XC), sulfonated lignite (SMC) and sulfonated phenolic resin (SMP).

[0027] In the follow...

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Abstract

The invention discloses a low-solid-phase low-temperature polymer drilling fluid containing a basic fluid and a treating agent, wherein the basic fluid is formed by compounding sodium-based bentonite and a sodium chloride solution, and the treating agent is formed by compounding a sulphonated compound cation exchange resin and polysaccharide as a flow pattern regulator. The low-solid-phase low-temperature polymer drilling fluid disclosed by the invention is strong in decomposition inhibition, good in rheological properties and low in fluid loss under low-temperature conditions, and meets the performance requirements of frozen soil natural gas hydrate drilling exploration on the drilling fluid.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a drilling fluid with good performance under low temperature conditions, and belongs to the field of engineering materials. Background technique [0002] Permafrost gas hydrates exist in a phase equilibrium environment of high pressure and low temperature. Drilling of natural gas hydrates in permafrost areas requires drilling fluids that can effectively inhibit the decomposition of hydrates and maintain their phase equilibrium. Good rheological properties to effectively suspend cuttings and maintain borehole stability. In permafrost regions, existing studies have shown that the low temperature environment of permafrost has the greatest impact on the performance of drilling fluids. Experimental studies show that the fluid loss of drilling fluid does not change much under low temperature conditions, and tends to decrease slightly. Under the low temperature environment, the basic rheological pr...

Claims

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Application Information

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IPC IPC(8): C09K8/24
CPCC09K8/24
Inventor 王胜陈礼仪张川袁超鹏叶长文李之军刘建成郭凯彬汪靖扉
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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