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Elimination liquid of filter cake

A technology for removing fluid and filter cake, applied in the field of drilling fluid, which can solve the problems of late start, blank filter cake removal, and small scope of use.

Inactive Publication Date: 2007-03-14
CNOOC TIANJIN BRANCH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the relatively small range of use of synthetic-based drilling fluids and oil-based drilling fluids in China, the matching work started relatively late, and the technical research on filter cake removal is still basically blank.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment one: the acid solution that is 4% by weight, 3% fatty alcohol polyoxyethylene ether, 5% aromatic hydrocarbons, 2% low molecular weight cationic polymers, 2% organic amine derivatives, 5% % KCl is added to the aqueous solution and mixed; among them, the acid solution is formed by mixing HCl and HF in a volume ratio of 1:1; the fatty alcohol polyoxyethylene ether is C 3 ~C 10 Mixed alcohol EO6; aromatic hydrocarbons are a mixture of xylene and carbon tetrachloride in a volume ratio of 6:4; low molecular weight cationic polymers are made of poly 2-hydroxypropyl dimethyl ammonium chloride and polydimethyl Diallyl ammonium chloride is mixed in a volume ratio of 6:4; organic amine derivatives are made of alkyltrimethylammonium chloride, octadecylamine and cetylpyridinium chloride in a volume ratio of 5:4 : 1 mixed. Dilute the configured filter cake removal liquid with filtered seawater or fresh water at a ratio of 1:1 (volume ratio) to the required volume, and po...

Embodiment 2

[0014] Embodiment two: by weight percent is 1% acid, 2% fatty alcohol polyoxyethylene ether, 4% aromatic hydrocarbons, 2% low molecular weight cationic polymers, 2% organic amine derivatives, 3% KCl is added into the aqueous solution and mixed; among them, the acid solution is formed by mixing HCl and HF in a volume ratio of 1:1; the fatty alcohol polyoxyethylene ether is C 3 to C 10 Mixed alcohol EO6; aromatic hydrocarbons are a mixture of xylene and carbon tetrachloride in a volume ratio of 6:4; low molecular weight cationic polymers are made of poly 2-hydroxypropyl dimethyl ammonium chloride and polydimethyl Diallyl ammonium chloride is mixed in a volume ratio of 6:4; organic amine derivatives are made of alkyltrimethylammonium chloride, octadecylamine and cetylpyridinium chloride in a volume ratio of 5:4 : 1 mixed. Dilute the configured filter cake removal liquid with filtered seawater or fresh water at a ratio of 1:1 (volume ratio) to the required volume, and pour it in...

Embodiment 3

[0015] Embodiment three: be 5% acid by weight percentage, 4% fatty alcohol polyoxyethylene ether, 6% aromatic hydrocarbons, 2% low molecular weight cationic polymers, 2% organic amine derivatives, 5% % KCl is added to the aqueous solution and mixed; among them, the acid solution is formed by mixing HCl and HF in a volume ratio of 1:1; the fatty alcohol polyoxyethylene ether is C 3 to C 10 Mixed alcohol EO6; aromatic hydrocarbons are a mixture of xylene and carbon tetrachloride in a volume ratio of 6:4; low molecular weight cationic polymers are made of poly 2-hydroxypropyl dimethyl ammonium chloride and polydimethyl Diallyl ammonium chloride is mixed in a volume ratio of 6:4; organic amine derivatives are made of alkyltrimethylammonium chloride, octadecylamine and cetylpyridinium chloride in a volume ratio of 5:4 : 1 mixed. Dilute the configured filter cake removal liquid with filtered seawater or fresh water at a ratio of 1:1 (volume ratio) to the required volume, and pour ...

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PUM

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Abstract

A filtered cake removing liquid for preventing the gap of sieving pipe from being blocked by filtered cake is proportionally prepared from acid (HCl plus HF), washing penetrant, solvent-type organic substance, asphalt dissolving filter loss reducer, clay stabilizer, corrosion retarder, KCl and water.

Description

technical field [0001] The invention relates to drilling fluid, in particular to a filter cake removal fluid. Background technique [0002] In the process of offshore oilfield development and drilling operations, in order to better protect oil and gas layers and inhibit the dispersion of shale, oil-based drilling fluids or synthetic-based drilling fluids are often used for drilling operations. In order to prevent synthetic-based or oil-based drilling fluids from filtering Cake clogs the screen and must be removed to the greatest extent possible. At present, due to the relatively small range of application of synthetic-based drilling fluids and oil-based drilling fluids in China, the supporting work started relatively late, and technical research on filter cake removal is still basically blank. [0003] During the drilling process, under the action of the pressure difference, the free fluid in the drilling fluid permeates into the cracks and pores of the well wall rock (filt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/04
Inventor 邓建明李斌田国兴岳前升
Owner CNOOC TIANJIN BRANCH