Descaling agent for sandstone acidification and preparation method thereof

A technology of descaling agent and sandstone, which is applied in the field of descaling agent for sandstone acidification and its preparation, can solve the problems of poor acidification effect and clogging of sandstone pores, etc., and achieve the effect of low preparation cost, simple preparation method and good market prospect

Inactive Publication Date: 2021-02-09
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when soil acid acidifies and dissolves sandstone formations, calcium and magnesium ions will be produced; when calcium and magnesium ions encounter hydrofluoric acid in soil acid, calcium fluoride and magnesium fluoride will be formed, which will block the sandstone pores and cause poor acidification effect

Method used

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  • Descaling agent for sandstone acidification and preparation method thereof
  • Descaling agent for sandstone acidification and preparation method thereof
  • Descaling agent for sandstone acidification and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of descaling agent for sandstone acidification, which adopts the following steps to prepare:

[0022] S1. Add 400mL of deionized water into the three-necked flask, and then drop 0.3mol of monomer A and 0.3mol of monomer B into the deionized water within 15min, and at the same time, add 0.3L / min to the three-necked flask. Pass nitrogen protection into the flask, and use a shear emulsification stirrer at a shear rate of 300r / min until the emulsion is uniform to obtain a reaction mixture;

[0023] S2. Continue to pass nitrogen protection into the three-necked flask at a rate of 0.3L / min, and heat the reaction mixture to 40°C at a stirring speed of 300r / min at a heating rate of 1°C / min, and wait for stirring After 5 minutes, add 0.03 mol of initiator, and continue to feed nitrogen gas at a rate of 0.2 L / min, and stir the mixed solution at a rate of 300 r / min for 15 minutes;

[0024] S3. Continue to heat the reaction mixture at a rate of 1°C / min to 45°C. After stirri...

Embodiment 2

[0029] A kind of descaling agent for sandstone acidification, which adopts the following steps to prepare:

[0030] S1. Add 400mL of deionized water into the three-necked flask, and then drop 0.4mol of monomer A and 0.4mol of monomer B into the deionized water within 15min, and at the same time, add 0.3L / min to the three-necked flask. Pass nitrogen protection into the flask, and use a shear emulsification stirrer at a shear rate of 300r / min until the emulsion is uniform to obtain a reaction mixture;

[0031] S2. Continue to pass nitrogen protection into the three-necked flask at a rate of 0.3L / min, and heat the reaction mixture to 40°C at a stirring speed of 300r / min at a heating rate of 1°C / min, and wait for stirring After 5 minutes, add 0.04mol of initiator, and continue to feed nitrogen at a rate of 0.3L / min, and stir the mixed solution at a rate of 300r / min for 15min;

[0032] S3. Continue to heat the reaction mixture at a heating rate of 1°C / min to make it continue to he...

Embodiment 3

[0037] A kind of descaling agent for sandstone acidification, which adopts the following steps to prepare:

[0038] S1. Add 400mL of deionized water into the three-necked flask, then drop 0.6mol of monomer A and 0.6mol of monomer B into the deionized water within 15min, and at the same time, add 400mL of deionized water to the three-necked flask at a rate of 0.3L / min Pass nitrogen protection into the flask, and use a shear emulsification stirrer at a shear rate of 300r / min until the emulsion is uniform to obtain a reaction mixture;

[0039]S2. Continue to pass nitrogen protection into the three-necked flask at a rate of 0.3L / min, and heat the reaction mixture to 40°C at a stirring speed of 300r / min at a heating rate of 1°C / min, and wait for stirring After 5 minutes, add 0.05 mol of initiator, and continue to feed nitrogen at a rate of 0.3 L / min, and stir the mixed solution at a rate of 300 r / min for 15 minutes;

[0040] S3. Continue to heat the reaction mixture at a rate of 1...

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Abstract

The invention discloses a descaling agent for sandstone acidification and a preparation method of the descaling agent. The descaling agent is a polymer formed by copolymerizing a monomer A and a monomer B in a molar ratio of 1: 1, wherein the chemical structural formula of the monomer A is shown in the description, the chemical structural formula of the monomer B is shown in the description, the weight-average molecular weight of the polymer is 1000-1300g / mol, and the molecular weight distribution coefficient of the polymer is 1.1-1.2. The descaling agent for sandstone acidification is a sulfonic group-containing polymer, can be directly added into a prepared acidification working solution for use, and can effectively remove calcium and magnesium ions in the acidification process without influencing the reaction or interaction among the acidification working solution, acid-erodible minerals and acid-soluble substances. Besides, the preparation method of the anti-scaling agent is simple, the anti-scaling agent is prepared by adding an initiator step by step under a low-temperature condition to initiate copolymerization, the preparation cost is low, and the anti-scaling agent has a good market prospect.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development, in particular to a descaling agent for sandstone acidification and a preparation method thereof. Background technique [0002] Acidizing is a chemical reaction between hydrogen ions in the acid solution and acid-soluble substances in the formation to dissolve these acid-etchable substances, so as to dredge and unblock the obstructions in the formation and increase the output of formation substances. At present, earth acid is mostly used for acidizing sandstone formations. However, calcium and magnesium ions will be produced when soil acid acidifies and dissolves sandstone formations; when calcium and magnesium ions encounter hydrofluoric acid in soil acid, calcium fluoride and magnesium fluoride will form precipitates, which will block the sandstone pores and cause poor acidification effect. Contents of the invention [0003] The purpose of the present invention i...

Claims

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Application Information

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IPC IPC(8): C09K8/528C08F220/06C08F212/14
CPCC08F220/06C09K8/528C08F212/30
Inventor 徐克彬祝琦王中泽
Owner CNPC BOHAI DRILLING ENG
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