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Horizontal well acidizing process based on complex acid solution system

A compound acid and horizontal well technology, which is applied in the direction of production fluid, wellbore/well components, drilling composition, etc., can solve the problems of difficult acidization and weak heterogeneity in horizontal wells, and avoid premature reaction or Layered, reduced usage, versatile effects

Active Publication Date: 2020-01-10
CHENGDU NORTH OIL EXPLORATION DEV TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a horizontal well acidizing process based on a composite acid liquid system, to solve the problem of difficulty in acidizing horizontal wells with weak heterogeneity in the prior art, and to achieve the purpose of improving the horizontal well acidizing process

Method used

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  • Horizontal well acidizing process based on complex acid solution system

Examples

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Effect test

Embodiment 1

[0029] The horizontal well acidizing process based on the composite acid liquid system includes the following steps: S1, completion of the well, running into the production string; S2, running the coiled tubing into the production string to the position of the reservoir to be stimulated; S3, running the coiled tubing into the production string The acid liquid is injected, and the treatment liquid is injected into the annular space between the coiled tubing and the production string, so that the acid liquid and the treatment liquid are mixed at the position of the reservoir to be stimulated to form an acidizing liquid.

[0030] Wherein, the acid solution includes a gelling agent, a thickener, a corrosion inhibitor, a drainage aid, an iron ion stabilizer, and hydrochloric acid; the treatment solution includes a foaming agent, a foam stabilizer, and calcium carbonate; the acid solution Mixed with treatment liquid to form acidizing liquid, said acidizing liquid includes the followi...

Embodiment 2

[0034] The difference between this embodiment and embodiment 1 is that the proportioning of the mixed acidizing solution is different: 0.8% gelling agent, 0.4% thickening agent, 5% corrosion inhibitor, 1.5% drainage aid, 1 iron ion stabilizer %, foaming agent 3%, foam stabilizer 0.2%, calcium carbonate 1%, hydrochloric acid 15%, and the balance is water.

Embodiment 3

[0036] The difference between this example and example 1 is that the proportioning of the acidified solution after mixing is different: 1.2% gelling agent, 0.3-0.5% thickening agent, 5% corrosion inhibitor, 1.5% drainage aid, stable iron ion 1% agent, 5% blowing agent, 0.2% foam stabilizer, 1% calcium carbonate, 15% hydrochloric acid, and the balance is water.

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Abstract

The invention discloses a horizontal well acidizing process based on a complex acid solution system. The horizontal well acidizing process based on the complex acid solution system comprises the following steps of S1, carrying out well completion, and putting down a production pipe column; S2, putting down a continuous oil pipe into the production pipe column until arriving at a reservoir positionto be productivity-increased; and S3, injecting acid liquor into the continuous oil pipe, injecting treating fluid into an annulus between the continuous oil pipe and the production pipe column, andmixing the acid liquor and the treating fluid at the reservoir position to be productivity-increased so as to form acidizing fluid. The invention aims to provide the horizontal well acidizing processbased on the complex acid solution system, so that the problem of high acidizing difficulty of a horizontal well with weak homogeneity in the prior art is solved, and the aim on improving the horizontal well acidizing process is achieved.

Description

technical field [0001] The invention relates to the field of acidizing production increase, in particular to a horizontal well acidizing process based on a composite acid liquid system. Background technique [0002] In the acidizing construction, due to the fast reaction speed of the acid rock and the short penetration distance of the acid, it can only eliminate the damage to the formation near the wellbore. Therefore, increasing the concentration of acid can appropriately increase the penetration distance of acid liquid. Generally, the effective period of increasing production by acidification is relatively short. After sandstone is acidified, the migration of clay particles or other particles may easily block the oil flow channels, resulting in a rapid increase in the initial production of acidification and a rapid decline in the later production. In carbonate reservoirs, because the acid fluid reacts with carbonate rock too quickly, the fractures far away from the well b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/594C09K8/74
CPCC09K8/594C09K8/74C09K2208/32E21B43/16
Inventor 刘敬强武新民王鹤米强波康博孙照磊王志坤韩炜杨鸿张小平张艺久吕新东梁力文张春琳汤夏岚李辰
Owner CHENGDU NORTH OIL EXPLORATION DEV TECH
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