Clastic sandstone gas reservoir acidizing fluid

A technology of clastic sandstone and acidizing fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems that the active acid cannot reach the deep part of the formation, the effective distance of the acid solution is short, and the performance requirements of the corrosion inhibitor are high. Achieve the effects of preventing or reducing secondary precipitation, increasing wellhead test output, and reducing secondary damage

Inactive Publication Date: 2013-01-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acidification of high-temperature sandstone reservoirs faces the following problems: First, the reaction speed between conventional soil acid and formation minerals is extremely fast at high temperature, the effective action distance of acid liquid is short, and the active acid cannot reach deep formations; secondly, the chemical reaction between HF and sandstone is not a simple one-time process. reaction, the by-products of fluorosilicide and fluoroaluminide can also undergo secondary and tertiary reactions with aluminosilicate to form a series of insoluble precipitates, causing serious damage to the reservoir; Downhole pipe strings and tools are highly corrosive, requiring high performance of corrosion inhibitors

Method used

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  • Clastic sandstone gas reservoir acidizing fluid
  • Clastic sandstone gas reservoir acidizing fluid
  • Clastic sandstone gas reservoir acidizing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 2.4g36% analytically pure hydrochloric acid, 3.0g hydroxyethylene diphosphonic acid, 2.2g ammonium bifluoride, 3.0g acetic acid, 0.25g Lan-926, 0.5g nitrilotriacetic acid, 1.0g polyquaternary ammonium under stirring, Add 0.5g of drainage aid A flatly O-15, 0.5g of drainage aid B fluorocarbon chain surfactant FSO-100, and 86.65g of water, and mix evenly to obtain the sandstone acidizing solution of the present invention.

Embodiment 2

[0024] Add 2.4g36% analytically pure hydrochloric acid, 3.0g hydroxyethylene diphosphonic acid, 3.0g ammonium bifluoride, 5.0g acetic acid, 0.25g Lan-926, 0.5g nitrilotriacetic acid, 1.0g polyquaternary ammonium under stirring, Add 0.5g of drainage aid A Pingping O-15, 0.5g of drainage aid B fluorocarbon chain surfactant FSO-100, 83.85g of water, and mix evenly to obtain the sandstone acidizing solution of the present invention.

Embodiment 3

[0026] Add 2.4g36% analytically pure hydrochloric acid, 6.0g hydroxyethylene diphosphonic acid, 3.7g ammonium bifluoride, 3.0g acetic acid, 0.5g Lan-926, 0.5g nitrilotriacetic acid, 1.0g polyquaternary ammonium under stirring, Add O-15, 0.5g drainage aid B fluorocarbon chain surfactant FSO-100, and 81.9g water to 0.5g of drainage aid A, and mix evenly to obtain the sandstone acidizing solution of the present invention.

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Abstract

The invention relates to a clastic sandstone reservoir acidizing fluid, which comprises, by weight, 0.5-1.0% of hydrochloric acid, 3.0-6.0% of HEDP, 2.0-4.5% of ammonium bifluoride, 3.0-5.0% of acetic acid, 0.25-0.5% of an organic acid corrosion inhibitor Lan-926, 0.5-1.0% of nitilotriacetic acid or iso ascorbic acid, 0.5-1.0% of a polyquaternary anti-swelling agent, 0.3-0.6% of a hydrocarbon chain surfactant peregal O-15 or O-20, 0.3-0.6% of a fluorocarbon chain surfactant FSO-100 or FSN-100 and the balance of water. The acidizing fluid has little corrosion and good cleanup effect, hardly produces secondary precipitation, and has little damage to reservoir.

Description

technical field [0001] The invention relates to a liquid system for acidizing high-temperature clastic sandstone gas reservoirs. Background technique [0002] Sandstone matrix acidizing technology is an important technology for oil and gas well plugging removal and production stimulation. Soil acid is the earliest and most commonly used acid system for sandstone acidification. Patent USP 5529125 introduces the application of organic phosphonates in HCl and HF, which can play a good retarding effect; patent CN 101089118 introduces an acidifying agent composition, which can relieve low permeability and high Plugging problem in salinity scale-prone sandstone reservoirs. The acidification of high-temperature sandstone reservoirs faces the following problems: First, the reaction speed between conventional soil acid and formation minerals is extremely fast at high temperature, the effective action distance of acid liquid is short, and the active acid cannot reach deep formations;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 原励张燕刘友权王川陈礼利张永国张倩
Owner PETROCHINA CO LTD
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