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Calcium fluoride stabilizing agent

A stabilizer, calcium fluoride technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of reducing formation permeability, reservoir damage, etc., achieve good stabilization effect, improve oil flow channels, increase The effect of solubility

Inactive Publication Date: 2017-02-15
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When soil acid is acidified, because the hydrofluoric acid existing in it easily reacts with the calcium ions in the carbonate, calcium montmorillonite, and calcite in the sandstone, the acid-sensitive mineral calcium fluoride precipitates and blocks the pore throat of the reservoir. Reduced formation permeability, causing new damage to the reservoir

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] The calcium fluoride stabilizer provided by the present invention is composed of the following materials in terms of parts by mass: 2 parts of sodium tripolyphosphate, 2.5 parts of sodium hexametaphosphate, 2.5 parts of EDTMPS, 3.5 parts of PBTCA, 40 parts of PAA, 2 parts of PAAS, 3.5 parts of citric acid, 44 parts of water.

[0019] Preparation method: Slowly add sodium tripolyphosphate, sodium hexametaphosphate, EDTMPS, PBTCA, PAA, PAAS, and citric acid into the reaction kettle in proportion, add water at the same time, stir until fully mixed, and obtain the finished product.

Embodiment 2

[0021] The calcium fluoride stabilizer provided by the present invention is composed of the following materials in terms of parts by mass: 1.5 parts of sodium tripolyphosphate, 3.5 parts of sodium hexametaphosphate, 3.5 parts of ATMP, 2.5 parts of DTMPPA, 50 parts of PAA, 3.5 parts of T225, 3 parts of ethylenediaminetetraacetic acid, 32.5 parts of water.

[0022] Preparation method: Slowly add sodium tripolyphosphate, sodium hexametaphosphate, ATMP, DTMPPA, PAA, T225, and ethylenediaminetetraacetic acid into the reaction kettle in proportion, add water at the same time, stir until fully mixed, and then obtain the finished product.

Embodiment 3

[0024] The calcium fluoride stabilizer provided by the present invention is composed of the following substances in terms of parts by mass: 4.5 parts of sodium tripolyphosphate, 3.5 parts of ATMP, 2.5 parts of HEDP, 55 parts of PAA, 3 parts of T225, and 3.5 parts of ethylenediaminetetraacetic acid , 28 parts of water.

[0025] Preparation method: Slowly add sodium tripolyphosphate, ATMP, HEDP, PAA, T225, and ethylenediaminetetraacetic acid into the reaction kettle in proportion, and add water at the same time, and stir until fully mixed to obtain the finished product.

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Abstract

The invention relates to a calcium fluoride stabilizing agent. The calcium fluoride stabilizing agent is composed of a polyphosphate scale inhibitor, an organic acid scale inhibitor, a dispersant, a chelating agent, and water. The preparation method comprises the following steps: adding water into a reactor, starting a stirrer, slowly adding a polyphosphate scale inhibitor, an organic acid scale inhibitor, a dispersant, and a chelating agent into water according to a ratio, and stirring until all components are fully mixed to obtain the calcium fluoride stabilizing agent. The provided calcium fluoride stabilizing agent has the characteristics of high temperature resistant property and good stabilizing effect, can effectively solve the problems that fluorides generated in acidification operation of oil and gas field exploitation obstruct the pore throats of reservoir stratum and the in-place permeability is reduced, largely improves the oil flowing channels, and increases the output of oil wells.

Description

technical field [0001] The invention belongs to the technical field of preparation of chemical products, and relates to a calcium fluoride stabilizer for inhibiting the generation of calcium fluoride in oil and gas field acidification operations. Background technique [0002] During the exploitation of oil and gas fields, after a period of exploitation of the oil well, the pressure decreases, and the crude oil in the deep formation is difficult to extract. One of the measures used in the past is to inject a certain concentration of acid liquid into the oil well to make it react with the formation rock, thereby increasing the formation permeability, improving the oil flow channel, and achieving the purpose of increasing the production of the oil well. [0003] At present, hydrochloric acid or earth acid (a mixture of hydrochloric acid and hydrofluoric acid) is mainly used for acidification in the acid treatment of sandstone. When soil acid is acidified, because the hydrofluo...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/62C09K8/74
CPCC09K8/03C09K8/62C09K8/74C09K2208/12
Inventor 李俊华路建萍张群桥李小军沈渭滨黄得顺张旭刘欣李继鹏刘聪
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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