Clean viscous acid for acid fracturing of carbonate reservoir

A technology of thickening acid in carbonate reservoirs, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems affecting the productivity of oil and gas wells, uneven liquid, clogged formations, etc., and achieve retardation performance Excellent, easy to flow back, prolonging the service life effect

Active Publication Date: 2012-05-16
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with water-based polyacrylamide, this product has improved temperature resistance, but its acid solubility is poor. It needs to use light oil, surfactant and copolymer to make suspended emulsion, and the prepared liquid is not uniform. There is a layer of oil-like suspended matter, which has high friction when injected into the well with a fracturing vehicle. The product is also easily cross-linked with aldehydes, which will cause formation blockage and affect the productivity of oil and gas wells

Method used

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  • Clean viscous acid for acid fracturing of carbonate reservoir
  • Clean viscous acid for acid fracturing of carbonate reservoir
  • Clean viscous acid for acid fracturing of carbonate reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Embodiment 1: The weight percent of each component of the raw material of thickened acid for carbonate rock acid pressing is:

[0079] 1. Hexadecyltrimethylammonium bromide: 3%;

[0080] 2. Sodium o-hydroxybenzoate: 0.3%;

[0081] 3. Hydrochloric acid with a concentration of 38%: 15%;

[0082] 4. Iron ion stabilizer adopts citric acid: 0.15%;

[0083] 5. Bisimidazoline quaternary ammonium salt: 0.2%;

[0084] 6. Tetraethylenepentamine polyoxypropylene polyoxyethylene ether: 0.25%

[0085] 7. N, N-di-sec-butyl-p-phenylenediamine: 0.05%

[0086] 8. The rest is water; the sum of the weight percentages of each component is 100%.

[0087] Preparation method of thickened acid for carbonate rock acid fracturing:

[0088] A. Add water to calculate the required weight in container a;

[0089] B, add sodium o-hydroxybenzoate in container b, get the water preparation concentration in container a and be the sodium o-hydroxybenzoate aqueous solution of 10% for subsequent use;...

Embodiment 2

[0094] Embodiment 2: The weight percent of each component of the raw material of thickened acid for carbonate rock acid pressing is:

[0095] 1. Hexadecyltrimethylammonium bromide (industrial product): 4%;

[0096] 2. Sodium o-hydroxybenzoate (industrial product): 0.4%;

[0097] 3. Hydrochloric acid (industrial product): 20%;

[0098] 4. Iron ion stabilizer adopts CX-301: 0.1%;

[0099] 5. Bisimidazoline quaternary ammonium salt (industrial product): 0.2%;

[0100] 6. Tetraethylenepentamine polyoxypropylene polyoxyethylene ether (industrial product): 0.2%

[0101] 7. N, N-di-sec-butyl-p-phenylenediamine (industrial product): 0.04%

[0102] 8. The rest is water; the sum of the weight percentages of each component is 100%.

[0103] The preparation method is the same as in Example 1, but the weight ratio is different.

[0104] Effect: The retardation rate of thickening acid for carbonate rock acid fracturing reaches 48%. After the core acidification experiment, the core pe...

Embodiment 3

[0105] Embodiment 3: The weight percent of each component of the raw material of thickened acid for carbonate rock acid pressing is:

[0106] 1. Hexadecyltrimethylammonium bromide: 5%;

[0107] 2. Sodium o-hydroxybenzoate: 0.5%;

[0108] 3. Hydrochloric acid: 22%;

[0109] 4. Iron ion stabilizer adopts citric acid: 0.2%;

[0110] 5. Bisimidazoline quaternary ammonium salt: 0.25%;

[0111] 6. Tetraethylenepentamine polyoxypropylene polyoxyethylene ether: 0.1%;

[0112] 7. N, N-di-sec-butyl-p-phenylenediamine: 0.02%;

[0113] 8. The rest is water; the sum of the weight percentages of each component is 100%.

[0114] The preparation method is the same as in Example 1, but the weight ratio is different.

[0115] Effect: The retardation rate of thickened acid for carbonate rock acid fracturing reaches 52%. After the core acidification experiment, the core permeability was increased by 9.6 times.

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Abstract

The invention discloses a clean viscous acid for acid fracturing of a carbonate reservoir, which is applied to the technical fields of acidification and acid fracturing of petroleum carbonate reservoirs. The clean viscous acid consists of the following components in percentage by weight: 3-7 percent of hexadecyl trimethyl ammonium bromide, 0.3-0.7 percent of sodium salicylate, 15-28 percent of hydrochloric acid, 0.125-0.25 percent of citric acid or 0.05-0.1 percent of CX-301 or 0.3-0.5 percent of TW-1 serving as an iron ion stabilizing agent, 0.2-0.25 percent of a diimidazoline quaternary ammonium salt and the balance of water. The clean viscous acid has high retardative property, the retarding rate can reach 42-56 percent, the fresh acid viscosity is 25-40 mPa.S, and the acid liquor viscosity rises during acid fracturing of the carbonate reservoir. When the hydrogen ion concentration falls till the pH is more than or equal to 2, the acid liquor viscosity rises for forming viscoelastic gel, the permeation resistance of an acid liquor in a high permeation layer is increased, and the length of an acid etching crack is prolonged. Reacted residual acid gel can undergo gel breaking automatically, is free from residues, is easy for discharging, and has small damage to stratums.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, in particular to the technical field of acidification and acid fracturing of carbonate rock reservoirs in the exploitation of petroleum and natural gas. It is a low damage, instant viscosifying, adjustable retarding rate cleaning thickening acid. Background technique [0002] In oil and gas reservoir formations, carbonate reservoirs occupy a considerable proportion. The oil and gas in this kind of reservoir cannot form high productivity due to low permeability. In the exploitation of oil and natural gas, acid fracturing technology is one of the effective measures to increase the production of oil and gas wells in carbonate reservoirs. The stimulation effect of acid fracturing in low-permeability carbonate reservoirs mainly depends on the length of acid-etched fractures and the conductivity of fractures. However, due to the rapid reaction between hydrochloric ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 张佩玉刘海廷刘建伟张坚平谌勇王玉萍张宁县滕强郭海
Owner BC P INC CHINA NAT PETROLEUM CORP
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