Solid acid rod for water injection well and preparation and injection methods of solid acid rod

A water injection well and solid acid technology, which is applied to chemical instruments and methods, mining fluids, earth drilling and production, etc., can solve the problems of flowback liquid needing treatment, complex acidizing process, and long time in the well, and achieve effective dissolution of dirt, The injection method is simple and the effect of reducing the pressure of the water injection well

Active Publication Date: 2019-07-19
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 deficiencies of the above-mentioned prior art, to provide a solid acid bar for water injection wells and its preparation and betting method, which overcomes 1 in the prior art: the transportation and storage of acid liquid requires a special acid tank truck ; 2: During the acidification of soil acid, there are still construction processes such as water release and pressure relief of the well, acidification string under the original string, and residual liquid flowback, etc., which have long occupation time for the well, complicated acidification process, and high labor intensity; 3: Flowback Liquid needs to be dealt with, etc.

Method used

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  • Solid acid rod for water injection well and preparation and injection methods of solid acid rod
  • Solid acid rod for water injection well and preparation and injection methods of solid acid rod

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specific Embodiment approach

[0021] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for the understanding and reading of those familiar with this technology, and are not used to limit the conditions for the implementation of the present invention , any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope covered by the technical content disclosed in the present invention without affecting the effect and purpose of the present invention. .

[0022] At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without...

Embodiment 1

[0033] The invention discloses a solid acid bar for water injection wells. The solid acid bar is composed of maleic acid-acrylic acid copolymer, ethyl acetate, water-soluble oleic acid imidazoline corrosion inhibitor, alpha-olefin sulfonate sodium, diethylene It is made of iron ammonium triaminepentaacetate and polyvinyl acetate emulsion, and the weight percentage of each component is: maleic acid-acrylic acid copolymer 25%~35%, ethyl acetate 10%~20%, water soluble 10%~18% oleic acid imidazoline corrosion inhibitor, 5%~12% sodium α-olefin sulfonate, 20%~30% iron ammonium diethylenetriaminepentaacetate, 5%~15% polyvinyl acetate emulsion, The shape of the solid acid rod is cylindrical.

Embodiment 2

[0035] The invention discloses a solid acid bar for water injection wells. The solid acid bar is composed of maleic acid-acrylic acid copolymer, ethyl acetate, water-soluble oleic acid imidazoline corrosion inhibitor, alpha-olefin sulfonate sodium, diethylene It is made of iron ammonium triaminepentaacetate and polyvinyl acetate emulsion, and the weight percentage of each component is: maleic acid-acrylic acid copolymer 25%~35%, ethyl acetate 10%~20%, water soluble 10%~18% oleic acid imidazoline corrosion inhibitor, 5%~12% sodium α-olefin sulfonate, 20%~30% iron ammonium diethylenetriaminepentaacetate, 5%~15% polyvinyl acetate emulsion, The shape of the solid acid rod is cylindrical.

[0036] Preferably, the weight percentage of each component is: maleic acid-acrylic acid copolymer 30%~35%, ethyl acetate 12%~15%, water-soluble oleic acid imidazoline corrosion inhibitor 10%~14% %, 6%~10% sodium α-olefin sulfonate, 20%~25% iron ammonium diethylenetriaminepentaacetate, 8%~12% po...

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Abstract

The invention discloses a solid acid rod for a water injection well as well as preparation and injection methods of the solid acid rod. The solid acid rod is prepared from 25%-35% of maleic acid-acrylic acid copolymer, 10%-20% of ethyl acetate, 10%-18% of water-soluble imidazoline oleate corrosion inhibitor, 5%-12% of sodium alpha-olefin sulfonate, 20%-30% of diethylenetriaminepentaacetic acid iron(III) diammonium and 5%-15% of polyvinyl acetate emulsion. The appearance of the solid acid rod is cylindrical.

Description

technical field [0001] The invention belongs to the technical field of acidizing oilfield water injection wells, and in particular relates to a solid acid bar for water injection wells and a preparation and injecting method thereof. Background technique [0002] With the continuous development of oilfields, due to the influence of reservoir physical properties, injection water quality and on-site management factors, the problem of under-injection of water injection wells has become increasingly prominent, resulting in the lack of timely replenishment of reservoir energy and affecting the development of oilfields. The ultra-low permeability block becomes more prominent. At present, for the under-injection problem of water injection wells, the main methods are pressurized circulation well flushing, acidizing and small-scale acid fracturing, of which acidizing accounts for more than 80%, and has become the most important means of treating under-injection wells in oilfields. Wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72C09K8/52C09K8/54E21B43/22
CPCC09K8/52C09K8/54C09K8/725C09K2208/32E21B43/16
Inventor 王尔珍张随望陆小兵王勇宋昭杰邓志颖隋蕾杨玲智胡改星
Owner PETROCHINA CO LTD
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