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Emulsion type waterproof locking agent for oil field and application thereof

A waterproof locking agent and emulsion type technology, which is applied in the field of oil and gas field development and oil and gas well drilling, can solve the problems of low surface tension, high surface tension, and low foaming rate, so as to improve gas phase permeability, reduce surface tension, and reduce water lock damage effect

Inactive Publication Date: 2020-12-29
SINOPEC NANJING RES INST OF CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the fact that the above-mentioned carbon-based surfactant waterproof locking agent generally has high surface tension, it is difficult to make the reservoir reach moisture, and the foaming rate is high, which cannot meet the requirements of on-site use. Emulsion-type waterproof locking agent with low foam rate for oil field

Method used

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  • Emulsion type waterproof locking agent for oil field and application thereof
  • Emulsion type waterproof locking agent for oil field and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0021] This embodiment provides an emulsion-type waterproof locking agent, which contains 20% of a surfactant composition and 10% of tricresyl phosphate in terms of mass percentage, and the rest is water. The composition of the surfactant composition is 5% nonionic surfactant, 60% anionic surfactant and 35% zwitterionic surfactant, and the structure of the nonionic surfactant is: R-(O-C-C) x -OH, wherein R is a straight-chain alkyl group with 10 carbons, x is 3, the anionic surfactant is petroleum sulfonate, the zwitterionic surfactant is sulfoethyl betaine, and the specific structural formula is: CH 3 (CH 2 ) 7 N + (CH 3 ) 2 (CH) 2 SO 3 .

Embodiment 2

[0023] This embodiment provides an emulsion-type waterproof locking agent, which contains 65% of a surfactant composition and 25% of triphenyl phosphate in terms of mass percentage, and the rest is water. The composition of the surfactant composition is 45% nonionic surfactant, 10% anionic surfactant and 45% zwitterionic surfactant, and the structure of the nonionic surfactant is: R-(O-C-C) x -OH, wherein R is a straight-chain alkyl group with 14 carbons, x is 4, the anionic surfactant is sodium dodecylbenzenesulfonate, and the zwitterionic surfactant is sulfopropyl betaine. The specific structural formula is: CH 3 (CH 2 ) 17 CONH(CH 2 ) 3 N + (CH 3 ) 2 (CH) 3 SO 3 .

Embodiment 3

[0025] This embodiment provides an emulsion-type waterproof locking agent, which contains 35% of a surfactant composition and 55% of trioctyl phosphate in terms of mass percentage, and the rest is water. The composition of the surfactant composition is 10% nonionic surfactant, 15% anionic surfactant and 75% zwitterionic surfactant, and the structure of the nonionic surfactant is: R-(O-C-C) x -OH, wherein R is a straight-chain alkyl group with 12 carbons, x is 5, the anionic surfactant is sodium dodecylsulfonate, and the zwitterionic surfactant is hydroxysulfopropyl betaine. The specific structural formula is: CH 3 (CH 2 ) 7 N + (CH 3 ) 2 CH 2 CH(OH)CH 2 SO 3 .

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Abstract

The invention provides an emulsion type waterproof locking agent for an oil field. The emulsion type waterproof locking agent is composed of the components in percentage by mass: 20-65% of a surfactant composition, 10-55% of a phosphate substance and the balance being water. The surfactant composition is composed of an anionic surfactant, a nonionic surfactant and a zwitterionic surfactant. By reducing the surface tension, the minimum surface tension of the emulsion type waterproof locking agent reaches 20 mN / m or below, filtrate flowback can be effectively increased, and the gas phase permeability is improved, so that the water locking damage to a reservoir is reduced. The emulsion type waterproof locking agent disclosed by the invention is low in foaming rate which is less than 15%, andcan meet the field use requirements of a working solution.

Description

technical field [0001] The invention relates to the technical fields of oil and gas well drilling and oil and gas field development, in particular to an emulsion-type waterproof locking agent used in oil field drilling, well completion, workover, water injection and recovery enhancement. Background technique [0002] In the process of drilling, completion, oil testing, workover, acidizing, fracturing and other operations in low permeability oilfields, because the liquid column pressure of the water-based working fluid is greater than the pore pressure of the formation, under the action of positive pressure difference, part of the working fluid will Fluid (mainly water) enters the water-wetted pores of the reservoir to produce water locking effect, which increases the seepage resistance of oil and gas gathering in the wellbore. In addition, the water self-absorption effect of reservoir rocks sucks the water phase in the wellbore working fluid into the oil and gas seepage chan...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/58
CPCC09K8/035C09K8/58
Inventor 王康袁俊秀封心领徐冬梅朱魁黄冬曾志强逯贵广
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD