Chelating acid of sandstone

An invisible acid and sandstone technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of short penetration distance, equipment corrosion, and poor slow-release effect, so as to achieve small corrosion and avoid secondary precipitation , good slow-release effect

Inactive Publication Date: 2013-03-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problems of existing products are: strong acidity, serious corrosion of equipment, poor slow-release effect, short penetration distance, etc.

Method used

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  • Chelating acid of sandstone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Formula 1: citric acid 5g, ammonium citrate 3g, ammonium chloride 2g, ethylenediaminetetraacetic acid (EDTA) 0.15g, surfactant (hexadecyltrimethylammonium bromide) 0.05g, Add 400mL of water, stir and mix, put 1g of rock core. The acid solution was used to carry out the core dissolution experiment at 80°C, see Table 1.

Embodiment 2

[0012] Example 2: Formula 2: citric acid 5g, ammonium citrate 3g, ammonium fluoride 2g, ethylenediaminetetraacetic acid (EDTA) 0.15g, surfactant (hexadecyltrimethylammonium bromide) 0.05g, Add 400mL of water, stir and mix well, and take 1g of the core mass. The acid solution was used to carry out the core dissolution experiment at 80°C, see Table 1.

Embodiment 3

[0013] Example 3: Formula 3: citric acid 5g, ammonium citrate 3g, ammonium fluoride 1g, ammonium chloride 1g, ethylenediaminetetraacetic acid (EDTA) 0.15g, surfactant (hexadecyltrimethyl bromide Ammonium) 0.05g was added to 400mL water, stirred and mixed, and the mass of the core was 1g. The acid solution was used to carry out the core dissolution experiment at 80°C, see Table 1.

[0014] Table 1 Dissolution of sandstone by invisible acid with different formulations

[0015]

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Abstract

The invention relates to acid mixed solution, in particular to a chelating acid of sandstone for the yield increase of oil-gas fields. The technical scheme is that: the chelating acid is prepared from citric acid, citrate, ammonium salt, ethylene diamine tetraacetic acid and surfactant in a ratio of (1-25):(1-20):(1-20):(0.01-1):(0.01-1). The chelating acid has the advantages that: the pH of a chelating acid system is more than 5, so that the chelating acid has small corrosion to metal pipelines and drilling equipment; the chelating acid has high dissolution to the sandstone, and the dissolution rate of the sandstone is more than 10 percent; the chelating acid also can effectively avoid the generation of secondary sedimentation; and the acid has excellent sustained-release effect, and can enter a deep stratum to work.

Description

technical field [0001] The invention relates to an acidic mixed liquid, in particular to a sandstone invisible acid for increasing production in oil and gas fields. Background technique [0002] Acidizing is one of the main measures to increase production in oil and gas fields. It is to inject one or several kinds of acid liquid or acid mixed liquid into the formation through the wellbore, and use the chemical reaction between the acid and some minerals in the formation to dissolve the connected pores in the reservoir or the natural (hydraulic) fracture wall rock, increasing the pores and The flow capacity of fractures is a technical measure to increase the production of oil and gas wells or increase the injection of water injection wells. [0003] In conventional acidizing construction, due to the fast reaction speed of acid rock and the short penetration distance of acid, it can only eliminate the damage near the wellbore. Increasing the concentration of acid can increas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
Inventor 李鹏孔瑛蒋官澄杨金荣高炜锋李文轩
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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