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Solid acid blockage remover and method for removing stratum blockage by using same

A technology of solid acid and plugging agent, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling compositions, etc. It can solve the problems of secondary blockage and unsatisfactory acidizing effect, achieve convenient packaging, and improve formation permeability The effect of high efficiency and short working cycle

Inactive Publication Date: 2020-09-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional acidizing plugging removal process is universal, but for different types of reservoirs, the acidizing effect may not be ideal, and may even cause secondary plugging to varying degrees

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a solid acid plugging removal agent, the main acid of which is solid acid, and the acidification plugging removal system includes a pre-fluid and a main treatment fluid, and the percentage by weight is as follows:

[0034] Prefluid: 15% solid hydrochloric acid + 1% pyridinium quaternary ammonium corrosion inhibitor + 0.5% ammonium chloride + 0.5% citric acid + 0.5% sodium lauryl sulfate + configuration water;

[0035] Main treatment solution: 8% solid hydrochloric acid + 4% ammonium fluoride + 1% pyridinium quaternary ammonium corrosion inhibitor + 0.5% ammonium chloride + 0.5% citric acid + 0.5% sodium lauryl sulfate + configuration water;

[0036] This embodiment corresponds to a method of using a solid acid plugging agent to remove formation plugging, the steps of which are as follows:

[0037] (1) On-site dosing:

[0038] Pre-fluid: First add 82.5% of configuration water to the liquid mixing tank, slowly add 15% solid hydrochloric acid unde...

Embodiment 2

[0044] This embodiment provides a solid acid plugging removal agent, the main acid of which is solid, and the acidification plugging removal system includes a pre-fluid and a main treatment fluid, and the percentage by weight is as follows:

[0045] Prefluid: 12% solid acid / methylenediamine dihydrochloride + 1.5% imidazoline quaternary ammonium corrosion inhibitor + 0.5% ammonium chloride + 1.0% sodium edetate + 1.0% polyoxyethylene Polyoxypropylene alcohol ether + configuration water;

[0046] Main treatment solution: 10% solid acid / methylenediamine dihydrochloride + 5% ammonium fluoride + 1.5% imidazoline quaternary ammonium corrosion inhibitor + 0.5% ammonium chloride + 1.0% sodium edetate +1.0% polyoxyethylene polyoxypropylene alcohol ether + configuration water;

[0047]This embodiment corresponds to a method of using a solid acid plugging agent to remove formation plugging, the steps of which are as follows:

[0048] (1) On-site dosing:

[0049] Pre-fluid: first add 8...

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Abstract

The invention discloses a solid acid blockage remover and a method for removing stratum blockage by using the solid acid blockage remover. The solid acid blocking remover comprises a prepad fluid anda main treatment fluid, wherein the prepad fluid comprises the following components in percentage by weight: 8-16% of solid acid, 0.5-1.5% of a corrosion inhibitor, 0.5-1.5% of a clay stabilizer, 0.5-1.5% of an iron ion stabilizer, 0.5-1.5% of a demulsification cleanup additive and the balance of water; wherein the main treatment liquid is prepared from 5%-10% of solid acid, 4%-8% of ammonium fluoride, 0.5%-1.5% of a corrosion inhibitor, 0.5%-1.5% of a clay stabilizer, 0.5%-1.5% of an iron ion stabilizer, 0.5%-1.5% of a demulsification cleanup additive and the balance of water. The solid acidserves as main acid, most of other treating agents are solid particles, and the defects that special equipment is needed for liquid acid transportation, and long-distance transportation is high in safety risk are overcome.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a solid acid plugging removal agent and a method for removing formation plugging. Background technique [0002] During the drilling and development of oil and gas fields, the working fluid and solid phase invade the formation, as well as the migration and expansion of clay mineral particles in the formation, which will lead to blockage of the oil and gas flow channels in the near wellbore zone of the reservoir. Acidizing is one of the main measures for the commissioning and stimulation of oil and gas wells and the stimulation of water injection wells. Acidizing is to dissolve various solid phase particles in the formation near the wellbore during drilling, completion, workover, water injection, and incremental injection through the flow and reaction of acid liquid in the intercrystals, cavities, and micro-fractures of the formation pores. and impurities, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528E21B37/06
CPCC09K8/528E21B37/06
Inventor 崔明月舒玉华梁冲邹洪岚崔伟香张合文王超王艳温晓红
Owner PETROCHINA CO LTD
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