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
CN102899013AInactive Publication Date: 2013-01-30PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2013-01-30
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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