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Scale dissolving cosolvent and preparation method thereof

A technology of co-solvent and scale dissolution, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of strong corrosion, weak removal of scale dissolvers, poor universality, etc., and achieve durability Good temperature, increase the scale dissolution rate, reduce the effect of reaction

Pending Publication Date: 2022-07-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a scale-dissolving assistant solvent mainly aimed at the field of oil production engineering, so as to solve the problems of existing scale-dissolving agents such as weak cleaning power, strong corrosion, and poor universality, so as to achieve the purpose of increasing production and injection of oil and water wells

Method used

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  • Scale dissolving cosolvent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 2% organic salt potassium benzoate, 1% organic phenol resorcinol, 0.5% cationic surfactant chlorohexadecylpyridine and 4% chelating agent tetrasodium ethylenediamine tetraacetate in sequence to the container, and the balance water, mix the components, and fully stir at room temperature to obtain 50g of scale solution, the pH value of the solution is 10, respectively add 1g of calcium carbonate and calcium sulfate into the conical flasks with 50mL of scale-dissolving agent, respectively, Stir well. After 1 hour of reaction at room temperature, the calcium sulfate scale dissolution rate reached 98.7%, and after 24 hours of reaction, the calcium carbonate scale dissolution rate was 67.5%.

Embodiment 2

[0025] Add 2.5% organic salt sodium p-toluenesulfonate, 1.5% organic phenol resorcinol, 0.5% cationic surfactant chlorododecyl pyridine, 4% chelating agent tetrasodium EDTA into the container in turn, The remaining amount of water, mix the components, and fully stir at room temperature to obtain 50g of scale-dissolving solution, the pH of the solution is 10.5, and 1g of calcium carbonate and calcium sulfate were added to the conical flasks with 50mL of scale-dissolving agent respectively. , stir well. After 1 hour of reaction at room temperature, the scale dissolution rate of calcium sulfate reached 95.1%, and after 24 hours of reaction, the scale dissolution rate of calcium carbonate was 63.2%.

Embodiment 3

[0027] Add 3% organic salt sodium benzoate, 1.2% organic phenol resorcinol, 0.9% cationic surfactant chlorododecyl pyridine and 4% chelating agent tetrasodium ethylenediamine tetraacetate in sequence to the container, the balance water , Mix the components and stir well at room temperature to obtain 50g of scale-dissolving solution with a pH value of 10.5. Add 1g of calcium carbonate and calcium sulfate to the conical flasks containing 50mL of scale-dissolving agent respectively, and fully Stir. After 1 hour of reaction at room temperature, the calcium sulfate scale dissolution rate reached 98.1%, and after 24 hours of reaction, the calcium carbonate scale dissolution rate was 63.8%.

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Abstract

The invention discloses a scale dissolving cosolvent which comprises organic salt, organic phenol, a cationic surface active agent and solvent water, and the mass ratio of the components is W (organic salt): W (organic phenol): W (cationic surface active agent) = (2-3%): (1-1.5%): (0.5-0.9%), and the balance is solvent water. The cleaning agent has the advantages of strong cleaning force, weak corrosivity and strong universality, and can effectively achieve the purpose of increasing the production and injection of the oil-water well.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and particularly relates to a scale-dissolving co-solvent and a preparation method thereof. Background technique [0002] Most of China's oilfields have entered the middle and late stages of development. Due to the long-term water injection development, the oil wells, water injection wells, pumps and tubing strings, surface gathering and transportation systems, and formations in many oilfields have suffered from scaling to varying degrees. Scaling will corrode equipment pipelines, block pipelines and formations, increase water injection pressure, reduce production efficiency, and seriously affect the normal production of oil fields. [0003] The existing descaling technologies mainly include mechanical method, physical method and chemical method. The mechanical method is simple, low-cost and high-efficiency, but it also has the fatal disadvantage that the equipment needs to be dis...

Claims

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Application Information

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IPC IPC(8): C09K8/528C09K8/584C09K8/60C09K8/54E21B37/06
CPCC09K8/528C09K8/584C09K8/602C09K8/605C09K8/54E21B37/06C09K2208/32
Inventor 张鑫吕红梅潘义虞建业
Owner CHINA PETROLEUM & CHEM CORP
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