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Annulus protection fluid for CO2 flooding injection well and preparation method thereof

A technology for injecting annular protection fluid into wells, which is applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc. It can solve problems such as oil casing corrosion and performance impact of annular protection fluid, and achieve good corrosion and scaling, inhibition of corrosion and scaling, the effect of simple and easy-to-operate preparation method

Inactive Publication Date: 2019-11-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a CO 2 Annulus protection fluid for flooding injection wells and its preparation method to solve the problem of corrosion of the oil casing in the annulus in the prior art and the influence of temperature during on-site production on the performance of the annulus protection fluid

Method used

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preparation example Construction

[0043] In addition, according to another aspect of the present invention, a CO 2 The preparation method of the annulus protection fluid of flooding injection well comprises the following steps: mixing the components according to the formula of the annulus protection fluid to obtain the annulus protection fluid.

[0044] In a preferred embodiment, the preparation method of the annular space protection solution comprises the following steps: using a water injection pump to add water into the liquid distribution tank car; adding corrosion inhibitors, density regulators, bactericides, pH regulators and Alcohol, after mixing, the ring space protection solution is obtained.

[0045] The components of the annulus protection fluid have good synergy and can control the injection of CO 2 Corrosion problems in the annulus of wells, the annulus protection fluid has a wide range of density adjustment, good bactericidal effect, good pH value control effect, can well inhibit the corrosion a...

Embodiment 1

[0049] The invention is compounded from the following raw materials: 5% dodecenyl succinic acid monoethanolamide, 8% sodium formate, 1.5% metronidazole diquaternary ammonium salt, 3% potassium hydroxide, and 3% sodium D-isoascorbate , 0.5% sodium heavy alkylbenzene sulfonate, 1% polyacryl alcohol, 3% amino nitrogen, and the balance is water.

[0050] Concrete preparation steps are:

[0051] Step 1: First add a certain amount of water to the tanker with a water injection pump;

[0052] Step 2: Then add 5% dodecenyl succinic acid monoethanolamide, 8% sodium formate, 1.5% metronidazole diquaternary ammonium salt, 3% potassium hydroxide, 3% sodium D-isoascorbate, heavy alkyl 0.5% sodium benzenesulfonate, 1% polyacryl alcohol, 3% amino nitrogen, stir with a stirrer while adding, and prepare a uniform solution;

[0053] Step 3: Connect the liquid dispensing tank car with the injection pump with a tee and a pipeline, and connect the outlet end of the tee with the working annulus. A...

Embodiment 2

[0055] The invention is compounded from the following raw materials: 6% dodecenyl succinic acid monoethanolamide, 9% sodium formate, 2.5% metronidazole diquaternary ammonium salt, 4% potassium hydroxide, and 3.5% sodium D-isoascorbate , 1% sodium heavy alkylbenzene sulfonate, 2% polyacryl alcohol, 4% amino nitrogen, and the balance is water.

[0056] Concrete preparation steps are:

[0057] Step 1: First add a certain amount of water to the tanker with a water injection pump;

[0058] Step 2: Then add 6% dodecenyl succinic acid monoethanolamide, 9% sodium formate, 2.5% metronidazole diquaternary ammonium salt, 4% potassium hydroxide, 3.5% sodium D-isoascorbate, heavy alkyl 1% sodium benzenesulfonate, 2% polyacryl alcohol, 4% amino nitrogen, stir with a stirrer while adding, and prepare a uniform solution;

[0059] Step 3: Connect the liquid dispensing tank car with the injection pump with a tee and a pipeline, and connect the outlet end of the tee with the working annulus. A...

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Abstract

The invention provides an annulus protection fluid for a CO2 flooding injection well and a preparation method thereof. The annulus protection fluid comprises a corrosion inhibitor, a density regulator, a sterilizing agent, a pH regulator, alcohol and water. The annulus protection fluid provided by the invention has good synergy in components, so the problem of corrosion of CO2 injection well annulus can be controlled; and the annulus protection fluid has the advantages of large density regulation range, good sterilization effect, excellent pH value control effect, capability of well inhibitingcorrosion of an oil sleeve pipe, low environmentally-friendly preparation cost, low freezing point and the like, and is simple, convenient and easily-operable in on-site preparation method, reliableand stable in performances and easy in storage. According to the invention, the annulus protection fluid for the CO2 flooding injection well and the preparation method thereof are applicable to annular space of oil production wells and gas injection and water injection wells, and can well control the problem of corrosion of annulus oil sleeve pipes.

Description

technical field [0001] The invention relates to the field of petrochemical technology, in particular to a CO 2 Disclosed are annulus protection fluid for flooding injection wells and a preparation method thereof. Background technique [0002] With the in-depth study of gas injection production, most oil fields in my country have the problem of oil casing corrosion in the annulus. During the injection process, the gas enters into the annular space and forms a complex corrosive environment with stagnant water and corrosive bacteria in the annular space, which will make the corrosion and perforation of the oil casing more and more serious, resulting in corrosion failure of the oil casing and shortening the wellbore. And the service life of the equipment, in severe cases, the oil well will be scrapped, causing huge economic losses. Annulus protection fluid is widely used because it has a good inhibitory effect on oil casing corrosion and can reduce the pressure difference betw...

Claims

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Application Information

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IPC IPC(8): C09K8/54C09K8/52C09K8/584C09K8/588
CPCC09K8/52C09K8/54C09K8/584C09K8/588C09K2208/32
Inventor 石善志田刚刘从平易勇刚于会永曾德智同航陈禹欣孙宜成
Owner PETROCHINA CO LTD
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