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High-temperature-resistant microemulsified acid system

A kind of micro-lactic acid and system technology, which can be used in drilling compositions, chemical instruments and methods, etc., and can solve problems such as unfavorable high temperature reservoir depth acidification.

Inactive Publication Date: 2014-01-15
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, it is not conducive to the deep acidification of high temperature reservoirs

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation and temperature resistance performance test of micro-lactic acid system containing sodium salicylate:

[0038] 14gCTAC, 3g n-butanol, 140ml hydrochloric acid, and 0 # Mix 60ml of diesel oil, place in a water bath at 50°C for stirring, add n-octanol dropwise until the solution is clear, and form microemulsion hydrochloric acid. Take about 11.26g of prepared microemulsion hydrochloric acid, add different amounts of sodium salicylate (0g, 0.005g, 0.01g, 0.02g, 0.04g, 0.06g, 0.08g), stir and clarify in a 50°C water bath, and then It was placed in a water bath at 100°C to investigate the temperature resistance of microlactic acid containing sodium salicylate, and the results are shown in Table 1.

[0039] Table 1 The effect of sodium salicylate content on the temperature resistance of microlactic acid

[0040]

[0041] As can be seen from Table 1, under other conditions being the same, the amount of sodium salicylate added directly affects the temperatur...

Embodiment 2

[0054] (1) Preparation and temperature resistance performance test of micro-lactic acid system containing potassium hydrogen phthalate:

[0055] Mix 14g CTAC, 3g n-butanol, 140ml hydrochloric acid, and 60ml diesel oil evenly, place in a water bath at 50°C and stir, add n-octanol dropwise until the solution is clear, and form conventional microlactic acid. Take about 11.26g of microlactic acid, add different amounts of potassium hydrogen phthalate (0g, 0.005g, 0.01g, 0.02g, 0.04g, 0.06g, 0.08g), place it in a 65°C water bath, stir and clarify it, and then dissolve it Placed in a water bath at 100°C, the temperature resistance performance is shown in Table 2.

[0056] Table 2 Effect of potassium hydrogen phthalate content on the temperature resistance of microlactic acid

[0057]

[0058] It can be seen from Table 2 that when the content of potassium hydrogen phthalate is 0.541% or 0.702%, the formed microlactic acid has high temperature resistance, and it is placed in a wat...

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Abstract

The invention relates to a microemulsified acid system for petroleum exploitation. The microemulsified acid system for petroleum exploitation is a mixture mainly consisting of diesel oil, hydrochloric acid, a positive ion surfactant, an auxiliary surfactant (C4-C8 aliphatic monohydric alcohol), and water-soluble organic salt, wherein based on the total weight of 100%, of the mixture, the water-soluble organic salt accounts for 0.15-0.80 wt%. The microemulsified acid system provided by the invention is resistant to a temperature of 100 DEG C (is not demulsified at 100 DEG C), and resistant to calcium ions with a content of 160000 mg / l-225000 mg / l, as well as has a retardance rate of 70-80% for marble and a corrosion inhibition rate of 50-60% for steel sheets.

Description

technical field [0001] The present invention relates to a kind of microemulsified acid system (Microemulsified acid system) used for petroleum collection, specifically, relates to a kind of microemulsified acid system used for petroleum collection. Background technique [0002] In order to improve the recovery of low-permeability oilfields, acidizing is an important construction method, and the performance of acidizing fluid determines the success or failure of acidizing construction. [0003] Currently known acid systems include thickened acid, foamed acid and emulsified acid. Viscosified acid degrades as time goes by and temperature rises, and quickly loses its retarding effect (He Anle, Research on VY-101 Acid Liquid Thickener and Viscosified Acid, [J]. Oilfield Chemistry, 1996, 13(4 ): 303-308); emulsified acid belongs to thermodynamically unstable system, and its salt tolerance is relatively poor, and it is easy to break the emulsion when encountering high salinity wat...

Claims

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Application Information

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IPC IPC(8): C09K8/74
CPCC09K8/74C09K8/602
Inventor 陈彦东方波卢拥军房鼎业邱晓慧彭亚寻梁利崔明月黄顺德郝敏
Owner EAST CHINA UNIV OF SCI & TECH