Resin plugging agent and preparation method thereof

A technology of plugging agent and main agent, which is applied in the field of resin plugging agent and its preparation, can solve the problems of strong alkalinity of raw materials, not easy to degrade, and low success rate of high pressure, and achieve simple preparation method, high adhesion strength, The effect of high compressive strength

Pending Publication Date: 2021-11-09
陕西蓝格石油钻采工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two patents proposed the method of using resin as raw material to prepare plugging agent, they had the defects of insufficient compressive strength, strong alkalinity of raw material, and difficult degradation
[0004] At present, the treatment of wellbore integrity mainly uses cement plugging system for plugging. In recent years, similar chemical plugging methods have also been used, such as gel and chemical cement, but most of them still have low pressure after plugging. Or the original leakage point leaks again during the fracturing process, etc.
Overall, the success rate of blocking the backpressure remains low

Method used

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  • Resin plugging agent and preparation method thereof
  • Resin plugging agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] This example provides the preparation and plugging effect of a resin-based plugging agent.

[0024] Add the main ingredient and water into the reaction kettle according to the mass ratio of 1:2, and then heat to 150-200°C and stir thoroughly until there are no lumps; add a density regulator to the obtained pasty substance, and stir it Add silane coupling agent KH570 and alumina powder (180-200 mesh) in sequence; after stirring and reacting for 30-60 minutes, add curing agent and 30% sodium carbonate solution or 30% barium carbonate solution, and stir at 60-100°C for 10 The blocking agent was obtained after ~30 min. The resin-based plugging agent described in this implementation is composed of the raw materials described in Table 1 in parts by mass.

[0025] Table 1. Composition and parts by mass of resin plugging agents

[0026]

[0027] Prepare 4% high-quality bentonite base slurry, add 3% of the plugging agent after pre-hydration for 24 hours, and fully stir, agi...

Embodiment 2

[0030] This embodiment provides the practical application effect of a resin-based plugging agent.

[0031] The actual composition of the resin plugging agent used in this example is the same as that of the test group 3 in Example 1. Squeeze 4 to 15m into the target section of the oil well 3 After 0.5 to 3 hours under formation conditions, a rigid solidified body with micro-swelling, good cementation, and impact resistance is formed to achieve high-strength plugging of the target well section. During the on-site construction process of the plugging agent of the present invention, the highest pressure after plugging is 70MPa, the pressure test is 30min, the pressure drop is less than 0.5MPa, the pressure test is qualified, and there is no leakage in the subsequent fracturing process, which is successfully completed Subsequent fracturing operations.

[0032] The specific construction cases are as follows:

[0033] (1) The pressure test of well A-1 failed before fracturing. Aft...

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Abstract

The invention discloses a resin plugging agent and a preparation method thereof. The resin plugging agent comprises 40-80 parts of a main agent, 10-30 parts of a curing agent, 4-6 parts of a density regulator, 0.1-5 parts of an accelerant, 1-8 parts of a hard inorganic material and 0.5-3 parts of a coupling agent. The main agent is one or a combination of more of phenolic resin, alkyd resin, amino resin, polyester resin, epoxy resin, polyurethane resin and acrylic resin; the curing agent is one or a combination of more of modified amine, aliphatic polyamine, alicyclic polyamine, low-molecular polyamide and tertiary amine; the density regulator is hollow glass beads; the accelerant is one of sodium carbonate and barium carbonate; the hard inorganic material is aluminum oxide powder; and the coupling agent is a silane coupling agent KH570. The plugging agent has the characteristics of good plugging effect, high adhesion strength, high compressive strength and high temperature resistance, meanwhile, the preparation method is simple, and the raw materials are easy to degrade and free of pollution.

Description

technical field [0001] The invention belongs to the field of wellbore chemical plugging in oil and gas fields, and in particular relates to a resin plugging agent and a preparation method thereof. Background technique [0002] Since the application of fracturing technology in the exploration and development of oil and gas fields, it has played an irreplaceable role more and more. Fracturing refers to artificially creating cracks in oil and gas layers under the action of high-pressure gas or high-pressure liquid to improve the flow environment of oil and gas in the formation, thereby increasing the production of oil and gas wells. Before the fracturing operation, it is necessary to conduct a pressure test on the entire wellbore to ensure the integrity of the wellbore before the perforation and fracturing procedures can be carried out. However, some wells often appear during the wellbore pressure test: (1) When the test pressure is low (less than 30MPa), the pressure test is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/42C09K8/44
CPCC09K8/03C09K8/426C09K8/44
Inventor 杜长财余鹏程
Owner 陕西蓝格石油钻采工程有限公司
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