A kind of injection method of solid retarded acid

A slow acid and solid technology, applied in chemical instruments and methods, mining fluids, earthwork drilling and production, etc., can solve the problems of reduced wellbore service life, high viscosity of residual acid, difficult flowback, etc., to reduce construction friction, Reduce safety risks and reduce the effect of the construction process

Active Publication Date: 2020-09-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] High-viscosity retarded acids such as conventional gelled acid, emulsified acid, chemically retarded acid, foam acid, etc. use surface equipment to press the acid liquid into the formation through the wellbore under high pressure conditions, and three aspects will be generated during the construction process. Problems: First, due to the high viscosity of the high-viscosity retarded acid, the frictional resistance of the acid fluid in the wellbore and the formation is relatively large, resulting in high construction pressure, low displacement and high construction cost when the acid fluid is injected into the formation from the ground , the safety is low; second, during the injection process, the acid liquid will inevitably come into contact with the wellbore, which will cause the wellbore to corrode and reduce the service life of the wellbore; harm

Method used

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  • A kind of injection method of solid retarded acid
  • A kind of injection method of solid retarded acid
  • A kind of injection method of solid retarded acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for injecting solid retarded acid, comprising the following steps in sequence:

[0029] (1) Preparation of solid tartaric acid:

[0030] 2kg solid glycolic acid and 10kg guar gum are stirred and mixed evenly, and the outlet size of the extruder is controlled to obtain 20 mesh particles. Put the granules into the coating pan, mix in 0.02g of zinc acetate, start the coating pan, rotate at a speed of 100 rpm, and irradiate the inside of the coating pan with an infrared lamp. After rotating for 15 minutes, 95% of Glycolic acid aqueous solution, rotate while spraying, spray for 60min, stop. Continue to rotate for 40min to obtain the wrapped solid acid.

[0031] (2) Injection construction of solid retarded acid:

[0032] Inject 60L of slick water into the sand mixing vehicle, pour the prepared 12kg solid acid into the sand mixing vehicle, mix the two, inject the mixed solution into the formation, shut down the well and wait for 3 hours, then start the well to prev...

Embodiment 2

[0034] A method for injecting solid retarded acid, comprising the following steps in sequence:

[0035] (1) Preparation of solid tartaric acid:

[0036] Stir and mix 5kg solid lactic acid and 10kg starch evenly, control the outlet size of the extruder, and obtain 40 mesh granules. Put the granules into the coating pot, mix in 0.1g of zinc acetate, start the coating pot, rotate at a speed of 300 rpm, and irradiate the inside of the coating pot with an infrared lamp. After rotating for 20 minutes, 96% of Glycolic acid aqueous solution, rotate while spraying, spray for 80min, stop. Continue to rotate for 60 minutes to obtain wrapped solid acid.

[0037] (2) Injection construction of solid retarded acid:

[0038] Inject 50L of linear glue fracturing fluid into the mixer truck, pour the prepared 10kg solid acid into the mixer truck, mix the two, inject the mixed solution into the formation, shut down the well and wait for 4 hours, then start the well to prevent blowout and compl...

Embodiment 3

[0040] A method for injecting solid retarded acid, comprising the following steps in sequence:

[0041] (1) Preparation of solid tartaric acid:

[0042] Stir and mix 8kg solid glycolic acid with 6kg locust bean gum and 4kg hydroxypropyl carboxymethyl cellulose, control the outlet size of the extruder to obtain 70 mesh particles. Put the granules into the coating pot, then mix in 0.32g of zinc acetate, start the coating pot, rotate at a speed of 200 rpm, and irradiate the inside of the coating pot with an infrared lamp. After rotating for 30 minutes, 95% of Glycolic acid aqueous solution, rotate while spraying, spray for 90min, stop. Continue to rotate for 30 minutes to obtain wrapped solid acid.

[0043] (2) Injection construction of solid retarded acid:

[0044] Inject 40L of linear glue fracturing fluid into the sand mixer truck, pour the prepared 32kg solid acid into the sand mixer truck to mix the two, inject the mixed fluid into the formation, shut down the well and wa...

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Abstract

The invention relates to a method for injecting a solid retarded acid, which includes: (1) uniformly mixing a solid acidic substance and a natural polymer according to a mass ratio of 0.2-1.2:1 to produce particles with a particle size of 20-70 mesh, and releasing In the coating pan, sprinkle zinc acetate powder, the coating pan rotates at a speed of 100-300 rpm, and at the same time irradiates with infrared light. After rotating for 10-30 minutes, spray the concentration of 92-98% with a spray gun Glycolic acid aqueous solution, stop after spraying for 60-90 minutes, and continue to rotate for 30-60 minutes to obtain solid retarded acid; (2) inject non-reactive liquid and solid retarded acid into the sand mixer, and the solid retarded acid The mass to volume ratio of the non-reactive liquid is 10‑80:100. After the sand mixer is mixed evenly, it is injected into the formation with a fracturing truck. When the solid retarded acid is delivered to the design position, stop the pump, remove the pipeline, and wait After 3‑6 hours, open the well and blow out. The invention has good resistance-reducing performance, is easy to discharge back, reduces construction cost, is beneficial to environmental protection, and has broad market application prospects.

Description

technical field [0001] The invention relates to a method for injecting solid retarded acid in the field of oil and gas field development and improvement. Background technique [0002] In acidizing stimulation, for different types of carbonate reservoirs, the acid-etched fractures that need to be stimulated are relatively long, which puts forward high requirements for reducing the acid-rock reaction rate. The conventional method to reduce acid-rock reaction is to use high-viscosity acid liquid and use the network structure formed by polymer compounds to delay the time for acid liquid to transfer to the rock surface, so as to meet the requirements of creating long fractures. In order to make the acid liquid reach the formation and interact with the formation, it is necessary to use an injection method to inject retarded acid from the surface through the wellbore to the target formation. [0003] High-viscosity retarded acids such as conventional gelled acid, emulsified acid, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27E21B43/267C09K8/74
CPCE21B43/26E21B43/267C09K8/74C09K8/725C09K8/90E21B43/27C09K8/70E21B41/02
Inventor 王世彬刘成城石朋钟钱虎游兴鹏蒋敏郭建春
Owner SOUTHWEST PETROLEUM UNIV
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