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Decompression and augmented injection agent for water injection well as well as preparation method and application thereof

A technology of injection booster and water injection well, which is used in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. problems, to achieve the effect of reducing construction labor intensity, shortening construction time, and saving acidizing operation time

Inactive Publication Date: 2017-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the commonly used acidizing of water injection wells mainly adopts the conventional acidizing mode. Conventional acid liquids include hydrochloric acid, hydrofluoric acid, fluoboric acid and corresponding additives. However, through years of conventional acidizing operations, it has been found that the typical construction procedure of conventional acidizing is three-stage (formerly liquid, treatment liquid, post liquid), there are problems such as large area occupied by acidizing equipment, long acidizing operation time, complex operation procedures, high requirements for operating environment, troublesome dynamic restoration and difficult coordination, etc. Oilfield water injection and production have serious impact

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A pressure-reducing and injection-increasing agent for water injection wells, comprising 250 parts by weight of a mixture of formic acid and acetic acid (the mass ratio between formic acid and acetic acid is: 2:3), 150 parts by weight of phytic acid, and 200 parts by weight of nitrilotriacetic acid Parts, 200 parts by weight of ethylenediaminetetraacetic acid, 100 parts by weight of hydrofluoric acid, 100 parts by weight of ammonium chloride; the total amount is 1000 parts by weight.

[0014] The preparation method of the above-mentioned depressurizing and increasing injection agent: mix and stir the materials according to the batching amount to obtain the depressurizing and increasing injecting agent.

[0015] Application of the above-mentioned depressurization booster injection: pump the depressurization booster injection into the high-pressure water injection pipeline, and inject it into the formation along with the injected water. Injection continues to inject water...

no. 2 example

[0017] A pressure-reducing and injection-increasing agent for water injection wells, the weight percentage of each component is: 250 parts by weight of a mixture of acetic acid, citric acid and maleic acid (the mass ratio between acetic acid, citric acid and maleic acid is: 2 :1:2), 120 parts by weight of phytic acid, 180 parts by weight of nitrilotriacetic acid, 170 parts by weight of sodium cyclohexylidene diamine tetraacetate, 80 parts by weight of hydrofluoric acid, 50 parts by weight of ammonium chloride, and 150 parts by weight of water Part; total amount is 1000 parts by weight.

[0018] The preparation method of the above-mentioned depressurizing and increasing injection agent is the same as that of Example 1.

[0019] Application of the above-mentioned pressure-reducing and increasing injection agent: inject water and pressure-reducing and increasing injection into the water injection well respectively, and when the water absorption index increases by 50%, stop inject...

no. 3 example

[0021] A pressure-reducing and injection-increasing agent for water injection wells, comprising 200 parts by weight of a mixture of maleic acid and sulfamic acid (mass ratio of maleic acid and sulfamic acid: 2:1), 100 parts by weight of phytic acid, and 150 parts by weight of nitrilotriacetic acid, 150 parts by weight of EDTMPA, 60 parts by weight of hydrofluoric acid, 50 parts by weight of ammonium chloride, and 290 parts by weight of water; the total amount is 1000 parts by weight.

[0022] Application of the above-mentioned pressure-reducing and increasing injection agent: inject water and pressure-reducing and increasing injection into the water injection well respectively, and when the water absorption index increases by 55%, stop injecting the pressure-reducing and increasing injection Inject water.

[0023] The water absorption index described in Example 1, Example 2, and Example 3 refers to the ratio of the daily injection rate of the water injection well to the wellhe...

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Abstract

The invention discloses a decompression and augmented injection agent for a water injection well as well as a preparation method and application of the decompression and augmented injection agent for the water injection well, and belongs to the field of chemicals for petroleum industry. The decompression and augmented injection agent comprises the following components in percentage by weight: 20 to 25% of organic acid, 10 to 15% of phytic acid, 15 to 20% of nitrilotriacetic acid, 15 to 20% of a metal ion chelating agent, 6 to 10% of hydrofluoric acid, 5 to 10 parts of ammonium chloride, and 0 to 29% of water. While preparing, the materials are mixed and stirred uniformly according to ingredient amounts to obtain the decompression and augmented injection agent. The decompression and augmented injection agent disclosed by the invention has the characteristics of three-section acidification of secondary precipitation control, long action radius and less corrosion, and further can overcome the defects of requirement on on-site liquid preparation, high operation intensity, long time, injection stop of the water injection well and the like in the prior art.

Description

technical field [0001] The invention belongs to the field of chemicals used in the petroleum industry, in particular to a pressure-reducing and injection-increasing agent for water injection wells, a preparation method and application thereof. Background technique [0002] At present, the commonly used acidizing of water injection wells mainly adopts the conventional acidizing mode. Conventional acid liquids include hydrochloric acid, hydrofluoric acid, fluoboric acid and corresponding additives. However, through years of conventional acidizing operations, it has been found that the typical construction procedure of conventional acidizing is three-stage (formerly liquid, treatment liquid, post liquid), there are problems such as large area occupied by acidizing equipment, long acidizing operation time, complicated operation procedures, high requirements for operating environment, troublesome dynamic recovery and difficult coordination, etc. Oilfield water injection and produ...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/52E21B43/22
CPCC09K8/58C09K8/52E21B43/16
Inventor 马惠刘奎虎马淑娇王玉生钱厚邓建华张智华蔡云飞
Owner CHINA PETROLEUM & CHEM CORP