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A kind of chelating blockage-removing agent suitable for complex scaling reservoirs and its preparation method

A technology of plugging remover and chelating agent, which is applied in the field of chelating plugging remover and its preparation, can solve the problems of long shut-in time, complicated treatment steps, secondary precipitation of acid liquid and poor plugging removal effect, etc., to prolong the action time , Inhibit the formation of scale, reduce the effect of resistance

Active Publication Date: 2019-11-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of complex treatment steps, long shut-in time, secondary precipitation of acid liquid and poor plugging removal effect in existing plugging removal agents for removing complex scales.

Method used

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  • A kind of chelating blockage-removing agent suitable for complex scaling reservoirs and its preparation method
  • A kind of chelating blockage-removing agent suitable for complex scaling reservoirs and its preparation method
  • A kind of chelating blockage-removing agent suitable for complex scaling reservoirs and its preparation method

Examples

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Effect test

preparation example Construction

[0038] The preparation method of the above-mentioned chelating plug-removing agent, the specific steps are as follows: add distilled water to the reaction kettle, and heat up to 50-55°C, then add the chelating agent, activator, penetrant, and scale inhibitor into the reaction kettle in sequence, Add one material and stir for 20-30 minutes, and stir for 30 minutes after adding all the materials to complete the preparation of the chelating plugging remover;

[0039] The addition amount of above-mentioned raw material all adds according to recipe amount.

[0040] The chelating agent is composed of the following components by mass percentage: 50% to 60% of aminocarboxylic acid chelating agents, 10% to 20% of hydroxycarboxylic acid chelating agents, 20% to 30% of organic phosphonate chelating agents, The chelating agent is prepared by mixing the above three components. The aminocarboxylic acid chelating agent is ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, m...

Embodiment 1

[0046] This embodiment provides a kind of chelation blockage removal agent suitable for complex scaling reservoirs, the chelation blockage removal agent is composed of the following components in mass percentage:

[0047] Chelating agent 5%, scale inhibitor 0.5%, activator 1%, penetrant 0.5%, and the rest is distilled water.

[0048] The preparation method of the above-mentioned chelating plug-removing agent, the specific steps are as follows: add distilled water to the reaction kettle, and heat up to 50-55°C, then add the chelating agent, activator, penetrant, and scale inhibitor into the reaction kettle in sequence, Add one material and stir for 20-30 minutes, and stir for 30 minutes after adding all the materials to complete the preparation of the chelating plugging remover.

[0049] In this embodiment, the chelating agent is composed of the following components by mass percentage: ethylenediaminetetraacetic acid (accounting for 30% by weight of the aminocarboxylic acid che...

Embodiment 2

[0051] This embodiment provides a kind of chelation blockage removal agent suitable for complex scaling reservoirs, the chelation blockage removal agent is composed of the following components in mass percentage:

[0052] Chelating agent 6%, scale inhibitor 0.6%, activator 1.5%, penetrant 0.7%, and the rest is distilled water.

[0053] The preparation method of the above-mentioned chelating plug-removing agent, the specific steps are as follows: add distilled water to the reaction kettle, and heat up to 50-55°C, then add the chelating agent, activator, penetrant, and scale inhibitor into the reaction kettle in sequence, Add one material and stir for 20-30 minutes, and stir for 30 minutes after adding all the materials to complete the preparation of the chelating plugging remover.

[0054] In this embodiment, the chelating agent is composed of the following components by mass percentage: diethylenetriaminepentaacetic acid (accounting for 30% by weight of the aminocarboxylic aci...

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Abstract

The invention provides a chelate blocking remover suitable for complicated scaling reservoir layers, and a preparation method of the chelate blocking remover. The chelate blocking remover is prepared from the following components by mass percent: 5-20% of a chelating agent, 0.5-1% of a scale inhibitor, 1-5% of an activator, 0.5-2% of a penetrant and the balance of distilled water. The chelate blocking remover can remove most of complex blockages, formed by complex inorganic scale such as carbonate scale and sulphate scale, and organic scale at immediate vicinity of wellbore zones with scaled oil reservoir, can inhibit the growth of the scale, and prolongs the action time. The chelate blocking remover is mainly used for removing complex scale blockages such as calcium carbonate, calcium sulfate, barium strontium sulfate scale and iron sulfide; the scale blockages are removed by means of saturated dispersion, chelating solubilization and crystal nucleus distortion; the chelate blocking remover can be used for dredging seepage channels of shafts and stratum, reducing oil gas water flow resistance, increasing the yield of an oil-gas well and reducing the injection pressure of a water injection well; furthermore, the chelate blocking remover has certain corrosion inhibition property and dissolution property, thus meeting the blockage removing conditions of the complicated scaling reservoir layers.

Description

technical field [0001] The present invention relates to a kind of chelating blockage-removing agent suitable for complex scaling reservoirs and its preparation method, in particular to reservoirs containing scales of various complex components, such as carbonate scale, sulfate scale, refractory Silicate, iron sulfide, etc., through strong chelation solubilization and removal of blockages, can effectively expand the radius of blockage removal, reduce the water injection pressure of water wells, and prolong the stable production period of oil wells. Background technique [0002] Scaling is an unavoidable problem in the development of oil and gas fields. In the process of oil and gas extraction, formation fluid passes through perforation holes, wellbore, and wellhead, and the pressure and temperature of the environment where the fluid is located changes. The original chemical balance of scale ions in formation water is broken, resulting in the deposition of inorganic salts and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524C09K8/528
CPCC09K8/524C09K8/528
Inventor 万向辉蒋文学李勇吴增智汪小宇金娜王坤李珊马托李文彬李雪许伟星
Owner BC P INC CHINA NAT PETROLEUM CORP
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