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Single-component annulus plugging agent and application method thereof

A plugging agent and annulus technology, which is applied in the field of oil and gas field chemistry, can solve the problems that construction personnel cannot understand in time, affect the safe and stable production of gas wells, and the leakage of annular protection fluid to casing pressure, etc., and achieve excellent bonding performance and mechanical properties, Good sealing performance and low construction risk

Inactive Publication Date: 2020-05-29
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After long-term production, part of the annular protection fluid will leak from the packer and other connecting parts, and it needs to be replenished in time
Regular replenishment of annular protection fluid can only provide short-term protection and can only be carried out through the "pressure relief and filling" cycle mode. The construction personnel cannot know in time how much oil jacket annular protection fluid needs to be added and whether it is full. All by feel and visual observation
Annulus containing hydrogen sulfide, loss of annulus protection fluid, and casing pressure increase caused by casing annulus leakage in high-hydrogen sulfide-containing gas wells seriously affect the safe and stable production of gas wells
And there is no relevant plugging process and product to solve this problem at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Based on 100g of epoxy resin, add 10g of dibutyl phthalate, and then add 15g of modified liquid dicyandiamide curing agent and stir evenly to obtain a plugging system suitable for latent curing agent at the bottom of a well at a high temperature of 130°C. The gel time of the system is more than 10 hours at 90°C, gels in 2.5 hours at 130°C, and solidifies and agglomerates in 3.5 hours.

[0020] The application method of the lost circulation agent is as follows: inject the lost circulation agent into the annulus of the casing by pumping the cement truck, and settle down to the leakage channel under the action of positive pressure difference and gravity, and then exchange it under the high temperature condition of the lost channel in the well. Combined curing to complete plugging.

Embodiment 2

[0022] Based on 100g of epoxy resin, add 15g of dioctyl phthalate, and then add 20g of modified liquid dicyandiamide curing agent and stir evenly to obtain a plugging system suitable for latent curing agent at the bottom of a well at a high temperature of 110°C. The gel time of the system is more than 10 hours at 90°C, gels in 3.5 hours at 110°C, and solidifies and agglomerates in 4 hours.

[0023] For the application method of the lost circulation agent, refer to Example 1.

Embodiment 3

[0025] Based on 100g of epoxy resin, add 20g of diallyl phthalate to dilute the resin, stir evenly, add 40g of silicon micropowder, 1.2g of KH-560 silane coupling agent and 15g of modified liquid dicyandiamide curing agent, and continue Stir until the filling is evenly dispersed. Obtain a high-density latent curing agent plugging system suitable for high temperature 130°C bottom hole. The gel time of the system is more than 10 hours at 90°C, gels in 2.5 hours at 130°C, and solidifies and agglomerates in 4 hours. The density of the plugging agent system can reach more than 1.35g / cm3, which can shorten the sinking time in the annular channel and quickly reach the leakage part at the bottom of the well.

[0026] For the application method of the lost circulation agent, refer to Example 1.

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Abstract

The invention discloses a preparation method and an application method of a single-component annulus plugging agent. The single-component annulus plugging agent comprises the following components: 100parts by weight of epoxy resin, 15-20 parts by weight of a curing agent, 10-20 parts by weight of a diluent, 0-50 parts by weight of a filler and 0-1.5 parts by weight of a coupling agent. The preparation method comprises the steps: preparing according to a formula, and uniformly stirring. The application method comprises the steps: injecting a plugging agent into the annulus of a casing pipe ina cementing truck pumping manner, settling to a leakage channel under the action of positive pressure difference and gravity, and crosslinking and curing under the high-temperature condition of the leakage channel in a well to form a plugging effect with good sealing property, strong differential pressure resistance and lasting and stable performance. The plugging agent not only can be stably settled and cured in an annulus protection liquid, but also is adjustable in viscosity density and curing temperature, and is suitable for leakage plugging in different well bottom environments. And a single-component system can be prepared, so that field operation is facilitated.

Description

technical field [0001] The invention relates to the field of oil and gas field chemistry, in particular to an annular plugging agent and an application method. Background technique [0002] During the development of sour gas fields, due to the tightness of connectors such as threaded fasteners, CO 2 、H 2 Corrosive media such as S may enter the annular space and cause severe corrosion. In order to prolong the service life of oil and casing, a packer is often used to complete the well, and an anti-corrosion annular space protection fluid is filled in the annular space. After long-term production, part of the annular protection fluid will leak from the packer and other connecting parts, which needs to be replenished in time. Regular replenishment of annular protection fluid can only provide short-term protection and can only be carried out through the "pressure relief and filling" cycle mode. The construction personnel cannot know in time how much oil jacket annular protecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44C09K8/467E21B33/13
CPCC09K8/426C09K8/44C09K8/467E21B33/13
Inventor 黄淼铭赵玉春何素芹刘文涛刘浩朱诚身李智慧黄雪松彭龙苏宁
Owner ZHENGZHOU UNIV
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