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Temperature-resistant diverting agent for acidizing operation and its preparation method and application

A technology of diverting agent and temperature resistance, which can be used in chemical instruments and methods, drilling compositions, etc., and can solve the problems of unsatisfactory temperature resistance of diverting agents.

Active Publication Date: 2020-02-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation temperature is generally between 60°C and 150°C, and the temperature resistance of these diverting agents is not ideal, so it is not suitable for high-temperature formations above 100°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1g of n-propanol was added to 39g of deionized water; under stirring, 32g of erucamidopropyl betaine (purchased from Shanghai Yincong New Material Technology Co., Ltd.) was gradually added for 30min; then 28g of nonyl Phenol polyoxyethylene ether (10) sulfonic acid sodium salt (purchased from Nanjing Qingyu Chemical Research Institute, the number average degree of polymerization is 10), and continued to stir for 30 minutes to obtain a uniform solution, which was the steering agent.

[0031] Add hydrochloric acid and water to aforementioned steering agent, make the final mass fraction of hydrochloric acid be 15%, make the final mass fraction of erucamidopropyl betaine be 2.67%, promptly make uniform solution, this solution is steering acid, its The viscosity at room temperature is 20mPa·s, and it is coded as A-1.

Embodiment 2

[0045] 2g n-butanol was added to 38g deionized water; under stirring, gradually added 36g of oleic amidopropyl betaine (purchased from Shanghai Yincong New Material Technology Co., Ltd.), the addition time was 20min; then added 24g nonyl Phenol polyoxyethylene ether (7) sulfate sodium salt (purchased from Nanjing Qingyu Chemical Research Institute, the number average degree of polymerization is 7), and continued to stir for 30 minutes to obtain a uniform solution, which was the steering agent.

[0046] Add hydrochloric acid and water to aforementioned steering agent, make hydrochloric acid mass fraction be in 20% hydrochloric acid, make the final mass fraction of erucamide propyl betaine be 4.2%, promptly make uniform solution, this solution is steering acid, its The viscosity at room temperature is 25mPa·s, and it is coded as A-2.

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Abstract

The present invention provides a temperature-resistant diverting agent and a preparation method thereof, wherein the diverting agent comprises a viscoelastic betaine-based surfactant and the sulfuric acid ester salt and / or sulfonate of alkylphenol polyoxyethylene ether according to a mass ratio of 0.5-2:1. The present invention further provides a diverting acid containing the diverting agent, wherein the diverting acid can be used for the stratum with a temperature of more than 100 DEG C.

Description

technical field [0001] The invention relates to a temperature-resistant diverting agent for acidizing oil reservoir formations, a preparation method and application thereof. Background technique [0002] It is often difficult to obtain satisfactory oil and gas production from low-permeability oil and gas reservoirs only by natural energy, and it is often necessary to acidify the reservoir formation. Acidizing operation refers to the process of dissolving and corroding formation pores and fractures with acid liquid to improve formation permeability. During the acidizing operation, the acid liquid preferentially enters the formation with high permeability, while the section with low permeability cannot be treated. In the prior art, this problem is generally solved by adding a diverting agent into the acid solution. The function of the diverting agent is realized in this way: in the pores and fractures of the formation, the HCl in the acid solution and the CaCO in the rock 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C09K8/68
CPCC09K8/604C09K8/68C09K8/74C09K8/885
Inventor 李财富高敏侯研博余伟发李本高
Owner CHINA PETROLEUM & CHEM CORP