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Workover fluid and preparation method and application thereof

A technology of workover fluid and fluff agent, which is applied in chemical instruments and methods, earthwork drilling and production, wellbore/well parts, etc., which can solve problems such as leakage, achieve strong drainage ability, keep the wellbore clean, and cause little damage to the formation Effect

Inactive Publication Date: 2016-08-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a workover fluid, which has high stability, good sand-carrying performance, strong drainage ability and little damage to the formation, can effectively plug the lost formation, and solves the problems of the existing technology. Reducing the density of workover fluid still has technical problems in the workover of leakage wells in low-pressure and low-permeability reservoirs

Method used

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  • Workover fluid and preparation method and application thereof
  • Workover fluid and preparation method and application thereof
  • Workover fluid and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0035] First, xanthan gum, hydroxypropyl guar gum and sodium sulfite are made into the fluff agent in a mass ratio of 8:2:3; sodium carboxymethyl starch and polyanionic cellulose are made in a mass ratio of 2:3 The layering agent; sodium dodecylsulfonate, polyoxyethylene octylphenol ether, dodecyl dimethyl amine oxide and dodecyl sulfate triethanolamine in a mass ratio of 1:2:1: 3 making the nucleating agent; triethanolamine, ethanol and dodecyl alcohol are made into the film-forming agent in a mass ratio of 2:3:2;

[0036] Then, get 895g of water and add in the reaction tank, then add the above-mentioned prepared fluff agent 5g, the above-mentioned prepared layering agent 15g, the above-mentioned prepared nucleating agent 2g, the above-mentioned prepared Film forming agent 3g, 7g oxygen scavenger, 1.5g fungicide, 40g potassium chloride, 8g high temperature stabilizer, 8g hydrogen sulfide removal agent, 1.5g corrosion inhibitor, 7g waterproof locking agent and 7g drainage aid,...

Embodiment 2

[0050] First, xanthan gum, hydroxypropyl guar gum and sodium sulfite are made into the fluff agent in a mass ratio of 8:2:3; sodium carboxymethyl starch and polyanionic cellulose are made in a mass ratio of 2:3 The layering agent; sodium dodecylsulfonate, polyoxyethylene octylphenol ether, dodecyl dimethyl amine oxide and dodecyl sulfate triethanolamine in a mass ratio of 1:2:1: 3 making the nucleating agent; triethanolamine, ethanol and dodecyl alcohol are made into the film-forming agent in a mass ratio of 2:3:2;

[0051] Then get 926g water and add in the retort, then add successively the fluff agent 4g of above-mentioned preparation, the layering agent 10g of above-mentioned preparation, the nucleating agent 1g of above-mentioned preparation, the film-forming agent 2g of above-mentioned preparation in retort by feeding funnel, 5g oxygen scavenger, 1g fungicide, 30g potassium chloride, 5g high temperature stabilizer, 5g hydrogen sulfide removal agent, 1g corrosion inhibitor...

Embodiment 3

[0065] First, xanthan gum, hydroxypropyl guar gum and sodium sulfite are made into the fluff agent in a mass ratio of 8:2:3; sodium carboxymethyl starch and polyanionic cellulose are made in a mass ratio of 2:3 The layering agent; sodium dodecylsulfonate, polyoxyethylene octylphenol ether, dodecyl dimethyl amine oxide and dodecyl sulfate triethanolamine in a mass ratio of 1:2:1: 3 making the nucleating agent; triethanolamine, ethanol and dodecyl alcohol are made into the film-forming agent in a mass ratio of 2:3:2;

[0066] Then, get 860g water and add in the retort, then add the fluff agent 8g prepared above, the layering agent 20g prepared above, the nucleating agent 3g prepared above, and the film-forming agent 5g prepared above through the feeding funnel in the retort successively , 10g oxygen scavenger, 2g bactericide, 50g potassium chloride, 10g high temperature stabilizer, 10g hydrogen sulfide removal agent, 2g corrosion inhibitor, 10g waterproof locking agent and 10g d...

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Abstract

The invention provides a workover fluid and its preparation method and application. The mass percent composition of the workover fluid is: fluff agent 0.4%-0.8%, layering agent 1.0%-2.0%, nucleating agent 0.1%-0.3% %, film forming agent 0.2%~0.5%, oxygen scavenger 0.5%~1.0%, fungicide 0.1%~0.2%, potassium chloride 3.0%~5.0%, high temperature stabilizer 0.5%~1.0%, hydrogen sulfide removal agent 0.5% to 1.0%, corrosion inhibitor 0.1% to 0.2%, waterproof locking agent 0.5% to 1.0%, drainage aid 0.5% to 1.0%, and water 86% to 93%. The workover fluid provided by the invention has high Stability, good sand-carrying performance, strong drainage ability and little damage to the formation, can effectively temporarily plug the formation, and solve the problem of low-pressure and low-permeability reservoir leakage well workover in the prior art by reducing the workover fluid density There are still technical problems of leakage phenomenon.

Description

technical field [0001] The invention relates to the technical field of oilfield additives, in particular to a workover fluid for low-pressure and low-permeability reservoirs, a preparation method and application thereof. Background technique [0002] Well workover is a work to eliminate faults and improve wellbore conditions to restore normal production of oil and gas wells or increase productivity. The working fluid used in the workover operation is called workover fluid, which can ensure Construction safety operations and prevention of workover fluid leakage into the formation play a role in protecting the reservoir. At present, workover fluids are mainly divided into foam workover fluid systems, solid phase temporary plugging type workover fluid systems, and glue workover fluid systems. , Hydrocarbon-based workover fluid system, gel-type workover fluid and clean brine workover fluid. [0003] For low-pressure and low-permeability reservoirs, the fractured leakage is larg...

Claims

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Application Information

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IPC IPC(8): C09K8/42E21B33/13
Inventor 温哲豪李达白建文马得华薛亚斐张家富衣德强牟春国傅鹏朱更更藤飞启朱李安贾建鹏梁凌云郑斌崔云群陈晓丽
Owner PETROCHINA CO LTD
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