High-efficiency hydrate inhibitive environment-friendly drilling fluid

A hydrate and inhibitory technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of weak inhibitory effect, and achieve the effect of less inhibitor addition, significant bactericidal effect, and good generation effect.

Active Publication Date: 2015-04-22
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently used deepwater drilling fluid system has a complex and diverse composition, and common treatment agents have a weak inhibitory effect on hydrate formation. Therefore, research on hydrate inhibition in drilling fluids at home and abroad focuses on the use of hydrate inhibitors.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] Drilling fluid comprises the following components by weight percentage: bentonite 4%, quaternary ammonium salt type gemini surfactant (X — = Cl — ) 0.1%, sodium chloride 5.0%, sodium carboxymethyl starch 2.0%, cationic polyacrylamide CPAM (molecular weight 4 million) 0.2%, solid anti-slump lubricant GFRH 1%. The experimental pressure was 15.0MPa, the controlled temperature was 0°C, and the experimental gas was methane with a purity of 99.9%. Under the experimental conditions, no hydrate was formed for 120 hours.

Embodiment 2

[0024] Drilling fluid comprises the following components by weight percentage: bentonite 6%, quaternary ammonium salt type gemini surfactant (X — = Cl — ) 0.4%, sodium chloride 8.0%, sodium carboxymethyl starch at 2.0%, cationic polyacrylamide CPAM (molecular weight 8 million) 0.5%, solid anti-slump lubricant GFRH at 2.0%. The experimental pressure was 15.1 MPa, the controlled temperature was -2.5°C, and the experimental gas was methane with a purity of 99.9%. Under the experimental conditions, no hydrate was formed for 120 hours.

Embodiment 3

[0026] Drilling fluid comprises the following components by weight percentage: bentonite 8.0%, quaternary ammonium salt type gemini surfactant (X — =Br — ) 0.7%, potassium chloride 8.0%, sodium carboxymethyl starch 3.0%, cationic polyacrylamide CPAM (molecular weight 12 million) 1.0%, solid anti-slump lubricant GFRH at 2.0%, test pressure 15.0MPa, control temperature -4.0 ℃, the experimental gas is methane with a purity of 99.9%, and no hydrate has been formed for 120 hours under the experimental conditions.

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Abstract

The invention relates to high-efficiency hydrate inhibitive environment-friendly drilling fluid, and particularly relates to the drilling fluid containing water, bentonite, hyamine dimeric surfactant, inorganic salt, sodium carboxymethyl starch, cationic polyacrylamide and solid anti-sloughing lubricating agent GFRH. The high-efficiency hydrate inhibitive environment-friendly drilling fluid can be used for exploiting continental or ocean oil-gas resources and can effectively inhibit the generation of hydrate; moreover, the components of the drilling fluid are small in environment harm, and the drilling fluid has the advantages of high efficiency and environmental protection.

Description

technical field [0001] The invention relates to a high-efficiency hydrate-inhibiting drilling fluid, in particular to a drilling fluid composed of water, bentonite, quaternary ammonium salt-type gemini surfactant, inorganic salt, sodium carboxymethyl starch, cationic polyacrylamide, and solid anti-slump lubricant Drilling fluid composed of GFRH is mainly used to solve the problem of gas hydrate formation in deepwater drilling. Background technique [0002] The downhole environment of deepwater oil and gas drilling is harsh and the operating conditions are complex. In the case of gas-bearing formations or natural gas hydrate formations, the decomposition gas of formation gas or natural gas hydrate formations will escape into the wellbore and annular space, and the free water in the drilling fluid will be in a suitable condition. Natural gas hydrates may be formed. The formation of hydrate makes the drilling pressure unstable, and the formation of hydrate increases the densit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/22C09K8/16
CPCC09K8/16C09K8/22C09K2208/22C09K2208/32C09K2208/34
Inventor 梁德青徐永霞龙臻
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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