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Acid liquor gel for acidified fracturing, as well as preparation method and use thereof

A technology of acid fracturing and acid fluid, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of not being able to carry fracturing proppant, not being able to create acid fracturing long fractures, and fast reaction speed of acid rock, etc. Achieve the effect of good elasticity, easy pumping, and reduce acid fluid loss

Inactive Publication Date: 2009-07-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing technology can reduce the acid-rock reaction speed to a certain extent and improve the acidizing effect, but the viscosity is low, and the fracturing proppant cannot be carried, especially for high-temperature deep wells in low-permeability formations, the acid-rock reaction speed is fast, and acid fracturing cannot be generated The problem of long seams remains unresolved

Method used

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  • Acid liquor gel for acidified fracturing, as well as preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] [embodiment 1] acid liquid gel, by mass percent component is as follows:

[0030] Concentrated hydrochloric acid 55.56% (equivalent to pure acid is 20%), polyacrylamide (hydrolysis degree 5.3%, molecular weight 8 million) 1.0%, sodium dichromate 0.1%, hexamethylenetetramine 0.2%, phenol 0.05%, more than The amount is water.

[0031] The preparation of the acid liquid gel of this embodiment; according to mass parts, sequentially add 43.09 parts of water, 55.56 parts of concentrated hydrochloric acid and 1.0 parts of polyacrylamide, stir well and add 0.1 parts of sodium dichromate, 0.2 parts of hexamethylene tetra Amine, 0.05 part phenol.

[0032] The cross-linking time of the acid liquid gel in this embodiment is 4 minutes at 100°C, and the cross-linked gel can be adjusted and hung (see attached figure). -1 The viscosity under the conditions is 186mPa.s; it will not be dehydrated or decomposed when placed at 140°C for 1 hour. The sedimentation velocity of quartz sand ...

Embodiment 2

[0034] As described in Example 1, the difference is that the mass percentage of hexamethylenetetramine is 0.1%. The cross-linking time of the acid gel is 5min, and other properties remain unchanged.

Embodiment 3

[0036] As described in Example 1, the difference is that the mass percentage of sodium dichromate is 0.2%. The crosslinking time of the acid gel is 1.75min. Place it at 140°C for 0.5hr without dehydration or decomposition.

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Abstract

The invention relates to an acidulating fracturing acid liquor gel, a preparation method and the application thereof. The acid liquor gel comprises the components based on the mass percentage: 5-40% of acid, 0.3-2.0% of polyacrylamides polymer, 0.03-1.5% of inorganic cross linker, 0.03-1.5% of organic cross linker and the rest of water. The polyacrylamides polymer is dissolved in aqueous solution containing the acid and stirred for 2-5hr until the polymer is completely dissolved, so that uniform sticky liquid is obtained and added with the organic cross linker and the inorganic cross linker at last. The acidulating fracturing acid liquor gel can be used for acidulating and fracturing the oil field at the high temperature of 70-120 DEG C. The gel has high viscocity and good elasticity, and can carry sand, thus realizing the aims of deep penetration of acid liquor, acid manufacture and slit pressing.

Description

(1) Technical field [0001] The invention relates to a preparation method of acid liquid used for acid fracturing production stimulation measures of carbonate rock reservoirs in oil exploitation, in particular to an acid liquid gel for acid fracturing in high-temperature oil fields, and belongs to the technical field of oil and gas field development. (2) Background technology [0002] Carbonate reservoirs are one of the important oil and gas reservoirs, and a large amount of oil and gas have been found in Paleozoic carbonate rock formations in China. Acid fracturing restores and improves the permeability of the formation through the dissolution of acid, and improves the productivity of oil and gas wells. It is one of the important production stimulation measures for carbonate reservoir stimulation. With the in-depth development of carbonate reservoirs, acid fracturing has been more and more widely used. [0003] The performance of acid fracturing fluid plays a key role in th...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/72
Inventor 王彦玲赵修太邱广敏刘德新郑晶晶李海涛倪洁王增宝
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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