Water injection well long-acting augmented injection acid technology

A water injection well, long-term technology, applied in wellbore/well components, production fluid, earth-moving drilling, etc., can solve the problems of water injection, high pressure and insufficient injection

Inactive Publication Date: 2018-06-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the existing technology cannot solv

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In order to overcome the problem that the existing technology cannot solve the problem of high-pressure under-injection or even failure to inject water in the water injection well. This embodiment provides a long-term enhanced injection acidification process for water injection wells. A local booster skid is added to a single well or water injection valve group to increase the injection pressure, and at the same time, Type II chelated acid solution with drag reduction and scale dissolution properties is added.

[0018] This method increases the injection pressure by adding a local pressurized skid to a single well or water injection valve group; at the same time, when the pressure is increased, type II chelated acid with drag reduction and scale dissolution properties is added to achieve comprehensive treatment and increase injection pressure. water purpose.

[0019] Through the combination of local pressure boosting and acidification, the problem of under-injection or ...

Embodiment 2

[0021] On the basis of Example 1, this example provides a long-term injection well acidification process, the type II chelating acid consists of the following components by mass percentage: sulfonic acid 15%, chelating agent 15% 25%, wetting agent 5~10%, cleaning agent 5~10%, stripping dispersant 8~15%, methanol 10%, corrosion inhibitor 1%, and the rest is water.

[0022] The preparation process is:

[0023] Add the formula amount of water into the reaction kettle, and then add the formula amount of sulfonic acid, chelating agent, wetting agent, cleaning agent, stripping dispersant, methanol, and corrosion inhibitor into the reaction kettle in sequence, and stir each time a component is added. After 15-20 minutes, the components are fully mixed, and after adding all the components, stir for 25-35 minutes to obtain the type II chelating acid solution.

[0024] Type II chelating acid liquid is injected into the deep part of the formation along with the injection water, which ha...

Embodiment 3

[0026] On the basis of Example 1, this embodiment provides a long-term injection acidification process for water injection wells, the local pressurization skid includes a pressurization device and a dosing device, and the pressurization device and the dosing device are connected. .

[0027] The pressurization device includes a first filter, a centrifugal booster pump and a first outlet manifold connected in sequence. There is a seal between the first filter and the centrifugal booster pump.

[0028] The medicine adding device comprises a medicine material agitator, a second filter, a diaphragm metering pump, a check valve and a second outlet manifold connected in sequence.

[0029] The pressurization working process is: incoming water from the water supply station → first filter → seal → centrifugal booster pump → first outlet header → water injection pipeline or water injection wellhead. The working process of dosing is: material mixer→second filter→diaphragm metering pump→...

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Abstract

The invention provides a water injection well long-acting augmented injection acid technology. Through a mode of combining local pressure lifting with acidification, the problem of low pressure injection or no injection is solved, and purposes of comprehensive treatment and increasing the amount of injected water are achieved. The method does not need to take off a pipe string and flowback well washing is not required. II type chelating acid has strong chelating property, in the acid-rock reaction process, Ca<2+>, Mg<2+>, Fe<3+> and other metal ions can be chelated to avoid secondary or tertiary precipitation generation, the rust inhibition (less than 3.0g/(m<2>.h)) is low at the same time, and the pipe string in a wellbore cannot be corroded to bring downhole accident.

Description

technical field [0001] The invention belongs to the technical field of oil field water injection development, and specifically relates to a long-term injection acidification process for water injection wells, which solves the problem of high-pressure under-injection or failure of injection in water injection wells through the combination of local pressure increase and acidification, and achieves comprehensive treatment. The purpose of increasing the amount of injected water. Background technique [0002] In the process of water injection development, with the prolongation of water injection time, most water injection wells often have problems such as the decline of water injection capacity and the formation pollution of perforated sections. For the water injection wells of ultra-low permeability reservoirs, this phenomenon is particularly prominent, and some water injection wells in some blocks have insufficient injection at high pressure, or even fail to inject water. In r...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/20
CPCE21B43/16E21B43/20
Inventor 陆红军宋昭杰姚斌巨亚锋张随望陆小兵王勇隋蕾王尔珍邓志颖
Owner PETROCHINA CO LTD
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