Anion-cation pair effect-based waterproof locking agent and application thereof

An anion-cation and water-proof locking agent technology, which is applied in the direction of drilling composition, production fluid, wellbore/well components, etc., can solve the problems of difficult reservoirs such as gas moisture, high surface tension, and low foaming rate, and achieve Low foaming rate, increased filtrate flowback, and improved gas/oil phase permeability

Pending Publication Date: 2022-04-12
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 high surface tension of the above-mentioned previously used waterproof locking agent, it is difficult to make the reservoir reach moisture, and the foaming rate is high, which cannot meet the requirements of on-site use. The present invention provides a waterproof locking agent based on the interaction of anions and cations , which has the advantages of low surface / interfacial tension, low foaming rate, and can effectively improve reservoir wettability. It can effectively increase filtrate flowback, increase gas / oil phase permeability, and reduce water lock damage in reservoirs. , the waterproof lock agent contains a phosphate defoamer with strong defoaming performance, so the foaming rate is low, less than 10%, which can meet the requirements of the working fluid on site

Method used

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  • Anion-cation pair effect-based waterproof locking agent and application thereof
  • Anion-cation pair effect-based waterproof locking agent and application thereof

Examples

Experimental program
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Embodiment 1

[0027] This embodiment provides a waterproof locking agent based on the effect of anion and cation pairs. In terms of mass percentage, the mass percentage of anion and cation pair surfactant composition is 10%. Zwitterionic surfactant C 8 h 17 N + (CH 3 ) 2 COO - The mass percent of butyl alcohol is 20%, the mass percent of n-butanol is 10%, the mass percent of tri-n-butyl phosphate is 15%, and the rest is water. Anionic-cation pair surfactant composition is sodium dodecylbenzenesulfonate and perfluoroalkyl quaternary ammonium salt C 6 f 13 CH 2 CH 2 N + (CH 3 ) 2 C 2 h 5 Cl — , the ratio of the two substances is 1:2.

Embodiment 2

[0029] This embodiment provides a kind of water-repellent locking agent based on the effect of anion and cation pair, in terms of mass percentage, the mass percentage of anion and cation pair surfactant composition is 30%, zwitterionic surfactant C 8 h 17 N + (CH 3 ) 2 (CH 2 ) 2 SO 3 The mass percentage of isopropanol is 10%, the mass percentage of isopropanol is 15%, the mass percentage of triisobutyl phosphate is 5%, and the rest is water. The anion-cation pair surfactant composition is sodium fatty alcohol polyoxyethylene ether carboxylate and perfluoroalkylamide quaternary ammonium salt C 6 f 13 CONH(CH 2 ) 3 N + (CH 3 ) 2 Cl — , the ratio of the two substances is 4:1.

Embodiment 3

[0031] This embodiment provides a waterproof locking agent based on the effect of anion and cation pairs. In terms of mass percentage, the mass percentage of anion and cation pair surfactant composition is 20%. Zwitterionic surfactant C 6 h 13 N + (CH 3 ) 2 (CH 2 ) 2 SO 3The mass percent of 15% is 15%, the mass percent of ethanol is 15%, the mass percent of trioctyl phosphate is 10%, and the rest is water. The anion-cation pair surfactant composition is sodium nonylphenol polyoxyethylene ether carboxylate and perfluoroalkylamide quaternary ammonium salt C 8 f 17 CONH (CH 2 ) 3 N + (CH 3 ) 2 Cl — , the ratio of the two substances is 10:1.

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Abstract

The invention provides a water blocking prevention agent based on anion-cation pair effect, which is composed of an anion-cation pair surfactant composition, a zwitterionic surfactant, short-chain alcohol, a defoaming agent and water, and the anion-cation pair surfactant composition is compounded by an anionic surfactant and a cationic fluorocarbon surfactant. According to the present invention, by using the action of the anion-cation pair between the anionic surfactant and the cationic fluorocarbon surfactant, the system has low surface/interface tension performance, the interface tension reaches 10 <-3 > mN/m, the minimum surface tension reaches 18 mN/m, and the water blocking prevention agent further can improve the wettability of the stratum surface to the hydrophobic and oleophobic amphiphobic direction, such that the water blocking prevention effect is significantly improved, and the water blocking prevention effect is significantly improved. Filtrate flowback can be effectively increased, the gas/oil phase permeability is improved, and the water blocking damage of a reservoir is remarkably reduced. The foaming rate of the water blocking preventing agent is low and is smaller than 10%, and the water blocking preventing agent can meet the use requirements of operations such as oil field drilling, well completion, well repair, water injection and recovery efficiency improvement.

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 a 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 channels of the res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/584C09K8/68E21B43/22
Inventor 江洋洋王康封心领徐冬梅
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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