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Water injection well nitric acid powder-acid liquid system and acidification process

A technology of powder acid solution and water injection well, which is applied in wellbore/well components, cleaning equipment, earth-moving drilling and other directions, can solve the problems of near-well blockage, no secondary sediment generation, and difficulty in dissolving dissolved substances, so as to avoid Corrosion, the effect of a wide concentration range

Inactive Publication Date: 2003-07-16
PETROCHINA CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to use the aqua regia formed by nitric acid and hydrochloric acid to have a very high dissolving ability in the formation, react with the formation blockage to generate soluble salts, no secondary precipitates are produced, and solve the problem of difficult removal of dissolved substances and The problem of plugging near the well

Method used

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Embodiment Construction

[0013] specific implementation

[0014] Well 126-11 in Youfangzhuang Oilfield of Changqing Oilfield Company, the new well was put into production on March 23, 1998. In May 1998, the injection was switched to the Y9 layer, the oil pressure was 14.5MPa, and the casing pressure was 14.5MPa. No water could be injected. The data analysis is Formation plugging and drilling contamination. On July 5, 1998, the Y9 layer was acidified with nitric acid powder. 33% low-injury solution 5m for preflush 3 , squeezed into 20% nitric acid powder solution 3m 3 , Spacer 2m 3 , 15% hydrochloric acid solution 6m 3 , the working pressure dropped from 18MPa to 8MPa, and the well was shut down and reacted for 1 hour with the special well flushing fluid vaporized and flushed. A large amount of sticky black silt is washed out. After betting, the oil pressure on the day is 10MPa, the casing pressure is 9.5MPa, and the daily water injection volume is 48m 3 . By the end of December, the oil pressu...

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Abstract

A nitric acid powder-acid liquid system for water injection well is composed of conventional well-flushing liquid, nitric acid powder solution and hydrochloric acid solution. Its acidifying process for unblocking the oil-bearing stratum by removing heavy oil and asphalt includes such steps as flushing well, sequentially injecting leading liquid, nitric acid powder solution, isolating liquid, hydrochloric acid solution and displacing liquid, closing well, reacting for 6-12 hr, and flushing well with aerated water.

Description

technical field [0001] The invention belongs to the technique of increasing the injection of water injection wells for petroleum development, in particular, it relates to a nitric acid powder acid liquid system and an acidification process for water injection wells. Background technique [0002] In oil field production, acidizing is a common measure for oil layer plugging removal. The current traditional and public acidizing fluids (such as China National Petroleum Corporation Changqing Oilfield Company) mainly include hydrochloric acid, earth acid and other traditional acid fluids, which can effectively partially Remove blockages in oil passages, but the main disadvantage is that the efficiency of removing blockages is low. When the amount or concentration of acid liquid is not matched, it will cause new sediment blockages, and the dissolution of rocks and clays is very limited. When high-concentration hydrochloric acid interacts with formation rocks, a large amount of calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06
Inventor 杨宗贵王博
Owner PETROCHINA CO LTD
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