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Anti-H2S clay-free phase saturated well-drilling fluid

A drilling fluid and clay-free technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as threats to the personal safety of on-site operators, inability to absorb hydrogen sulfide gas, and dangerous construction environments, so as to protect oil and gas resources , Enhanced oil and gas recovery, good stability

Inactive Publication Date: 2019-01-22
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] If hydrogen sulfide poisonous gas cannot be absorbed and transformed by mud when drilling into formations containing hydrogen sulfide during oilfield drilling and production, it will return to the wellhead with the mud in the form of gas and be released in the air, directly threatening the personal safety of field operators and even causing If there are residential areas or market towns near the well site, the consequences will be even more disastrous
When the existing common drilling fluid system is applied in the formation containing hydrogen sulfide, it cannot absorb the hydrogen sulfide gas in the formation, resulting in a very dangerous construction environment on site

Method used

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  • Anti-H2S clay-free phase saturated well-drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of anti-H provided by the present invention 2 S Clay-free saturated drilling fluid, wherein the weight percentage of each component is:

[0028] 20% sodium chloride; 0.2% sodium carbonate; 0.3% sodium hydroxide; 1% flow regulator; 2% modified starch; 5% potassium chloride; 0.3% zinc carbonate; 2% lubricant; 6.5% film forming Blocking agent; 5% superfine calcium carbonate; 2% waterproof locking agent; 15% barite, and the balance is water.

[0029] Wherein, the flow regulator is formed by mixing a terpolymer of acrylic acid, acrylamide and sodium 2-acrylamido-2-methylpropyl sulfonate and polyanionic cellulose in a mass ratio of 1:1;

[0030] Described lubricant is polyethylene glycol;

[0031] The film-forming plugging agent is formed by mixing a terpolymer of acrylamide, sodium 1-ene butyl sulfonate and triethylallyl ammonium chloride and superfine calcium carbonate in a mass ratio of 3:10;

[0032] The waterproof locking agent is: potassium perfluoroalkyl ethe...

Embodiment 2

[0034] A kind of anti-H provided by the present invention 2 S Clay-free saturated drilling fluid, wherein the weight percentage of each component is:

[0035] 23% sodium chloride; 0.3% sodium carbonate; 0.2% sodium hydroxide; 1.5% flow regulator; 3% modified starch; 5% potassium chloride; 0.4% zinc carbonate; 2% lubricant; 6% film forming Sealing agent; 2% waterproof locking agent; 20% limestone; the balance is water.

[0036] Wherein, the flow regulator is formed by mixing a terpolymer of acrylic acid, acrylamide and sodium 2-acrylamido-2-methylpropyl sulfonate and polyanionic cellulose in a mass ratio of 8:7;

[0037] The lubricant is formed by mixing polyethylene glycol and polypropylene glycol in a mass ratio of 1:1. .

[0038] The film-forming plugging agent is formed by mixing a terpolymer of acrylamide, sodium 1-ene butyl sulfonate and triethylallyl ammonium chloride and superfine calcium carbonate according to a mass ratio of 1:3; The waterproof locking agent is: p...

Embodiment 3

[0040] A kind of anti-H provided by the present invention 2 S Clay-free saturated drilling fluid, wherein the weight percentage of each component is:

[0041] 20% sodium chloride; 0.3% sodium carbonate; 0.2% sodium hydroxide; 2% flow regulator; 2% modified starch; 5% potassium chloride; 0.2% zinc carbonate; 0.2% iron sulfate; 2% lubricant ; 6% film-forming blocking agent; 2% waterproof locking agent; 20% weighting agent; the balance is water.

[0042] Wherein, the flow regulator is formed by mixing a terpolymer of acrylic acid, acrylamide and sodium 2-acrylamido-2-methylpropylsulfonate and polyanionic cellulose in a mass ratio of 3:1;

[0043] The lubricant is polypropylene glycol.

[0044] The film-forming plugging agent is formed by mixing a terpolymer of acrylamide, sodium 1-ene butyl sulfonate and triethylallyl ammonium chloride and superfine calcium carbonate in a mass ratio of 1:2; .

[0045]The waterproof locking agent is: potassium perfluoroalkyl ether carboxylate ...

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Abstract

The invention discloses an anti-H2S clay-free phase saturated well-drilling fluid composed of the following components by the mass percentage: 8%-25% of sodium chloride, 0.1%-0.7% of a pH regulator, 0.8%-3% of a flow pattern regulator, 1%-4% of a filtrate reducer, 0.1%-1% of a desulfurizer, 1.5%-2.5% of a lubricant, 4.5%-7% of a film-forming plugging agent, 1%-2.5% of a waterproof lock agent, 3%-6% of an anti-swelling agent, 1%-20% of a weighting agent, and the balance water. The well-drilling fluid contains the desulfurizer, can absorb hydrogen sulfide gas in stratum, solves the problem thata conventional well-drilling fluid cannot absorb H2S, and can be well applied to well drilling in H2S gas-containing stratum.

Description

technical field [0001] The invention relates to the technical field of drilling fluid systems, in particular to an anti-H 2 S Clay-free saturated drilling fluid. Background technique [0002] Drilling fluid is the circulating flushing medium used in the hole during the drilling process. Drilling fluid is the blood of drilling, also known as drilling flushing fluid. It can be liquid or gas. [0003] The functions of drilling fluid are: carry cuttings, clean the bottom of the well; cool and lubricate the drill bit and drill string; form a filter cake on the well wall to stabilize the well wall; carry cuttings; suspend cuttings and density adjustment materials; balance formation pressure; Sand and cuttings are removed from the ground; hydraulic power is effectively transmitted; formation information is obtained; part of the gravity of the drill pipe and casing is supported; rock-breaking power is transmitted. [0004] According to the difference of base fluid and main treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12C09K8/03
CPCC09K8/032C09K8/12C09K2208/12C09K2208/20C09K2208/34
Inventor 肖娜朱锐
Owner YANGTZE UNIVERSITY