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Gel plugging agent and preparation method thereof

The technology of a plugging agent and gel is applied in the field of gel plugging agent and its preparation. The effect of high performance, improved strength, and simple and convenient construction

Active Publication Date: 2015-06-24
商南天和泥浆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing plugging materials have the following defects: 1. During the plugging process, the variability of the plugging agent itself is relatively large, and it is slightly larger than the pores or cracks of the leakage layer. Material particles that do not match the shape of the cracks should not enter, and will The cut surface of the leaky layer is piled up, and it cannot completely enter the leaky layer or crack; 2. The plugging material does not have the ideal expansibility and the expansion is small, which may easily cause the plugging effect to be insignificant and repeatable missing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The gel plugging agent of this embodiment is made of the following raw materials in weight percentage: sodium polyacrylate 6%, cotton silk 20%, ammonium persulfate 0.08%, methacryloyloxyethyltrimethylammonium chloride 3% , 20% wood powder, and the balance is acrylamide; the length of the cotton thread is not more than 3mm; the particle size of the wood powder is 20 mesh to 80 mesh.

[0021] The preparation method of the gel plugging agent in this embodiment comprises: adding wood powder and cotton silk into a mixer and stirring for 10 minutes, then adding methacryloyloxyethyltrimethylammonium chloride into the mixer, After stirring evenly, add sodium polyacrylate, acrylamide and ammonium persulfate, and stir at 25°C for 18 minutes to obtain a gel plugging agent.

[0022] When using the gel plugging agent of this example, first mix the gel plugging agent and water according to the mass ratio of (1-1.5): 1 to obtain the plugging slurry, and then inject the plugging slurry...

Embodiment 2

[0038] The gel plugging agent of this embodiment is made of the following raw materials in weight percentage: sodium polyacrylate 8%, cotton silk 15%, ammonium persulfate 0.1%, methacryloyloxyethyltrimethylammonium chloride 1% , wood powder 15%, the balance is acrylamide; the length of the cotton thread is not more than 3mm; the particle size of the wood powder is 80 mesh to 100 mesh.

[0039] The preparation method of the gel plugging agent of this embodiment comprises: adding wood flour and cotton silk into a mixer and stirring for 15 minutes, then adding methacryloyloxyethyltrimethylammonium chloride into the mixer, After stirring evenly, add sodium polyacrylate, acrylamide and ammonium persulfate, and stir at 20°C for 20 minutes to obtain a gel plugging agent.

[0040] When using the gel plugging agent of this example, first mix the gel plugging agent and water according to the mass ratio of (1-1.5): 1 to obtain the plugging slurry, and then inject the plugging slurry into...

Embodiment 3

[0051] The gel plugging agent of this embodiment is made from the following raw materials in weight percentage: sodium polyacrylate 4%, cotton silk 25%, ammonium persulfate 0.05%, methacryloyloxyethyltrimethylammonium chloride 5% , wood powder 25%, the balance is acrylamide; the length of the cotton filament is not more than 3mm; the particle size of the wood powder is 20 mesh to 100 mesh.

[0052] The preparation method of the gel plugging agent of this embodiment comprises: adding wood flour and cotton silk into a mixer and stirring for 5 minutes, then adding methacryloyloxyethyltrimethylammonium chloride into the mixer, After stirring evenly, add sodium polyacrylate, acrylamide and ammonium persulfate, and stir at 30°C for 15 minutes to obtain a gel plugging agent.

[0053] When using the gel plugging agent of this example, first mix the gel plugging agent and water according to the mass ratio of (1-1.5): 1 to obtain the plugging slurry, and then inject the plugging slurry ...

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Abstract

The invention discloses a gel plugging agent which is prepared from the following raw materials in percentage by weight: 4-8% of sodium polyacrylate, 15-25% of staple, 0.05-0.1% of ammonium persulfate, 1-5% of methylacryloyloxyethyltrimethyl ammonium chloride, 15-25% of wood meal and the balance of acrylamide. Besides, the invention also discloses a preparation method of the gel plugging agent. When in use, the gel plugging agent is firstly mixed with water to form a plugging slurry; the plugging slurry can easily enter the cracks or leakage zone of the rock pores, stay and generate generation blockage; the staple in the plugging slurry quickly huddles, the sodium polyacrylate quickly expands, and the staple and sodium polyacrylate quickly form a bridge, so that the plugging slurry slowly stops flowing in the cracks and rock pores; and the acrylamide generates chain polymerization reaction and condenses into a hard solid, and is cemented with the leakage zone rock, thereby enhancing the plugging effect and enhancing the strength of the loss zone.

Description

technical field [0001] The invention belongs to the technical field of wellbore plugging, and in particular relates to a gel plugging agent and a preparation method thereof. Background technique [0002] Lost circulation is a downhole complex situation in which working fluid leaks into the formation in drilling engineering, and it is one of the most common and most frequently encountered complex problems in drilling operations. In the drilling operation, once leakage occurs, not only the drilling time will be delayed, the drilling fluid will be lost, the oil and gas layers will be damaged, and the normal progress of the geological logging work will be affected, but also the well wall may become unstable, leading to a series of well collapse, pipe sticking, blowout and so on. Complicated situations and accidents, if not handled properly, will lead to the scrapping of the wellbore. [0003] In the leak prevention and plugging process of drilling engineering, the plugging mate...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/42C08F291/08C08F220/56E21B33/13
CPCC08F291/08C09K8/426C09K8/44C09K2208/08C08F220/56C08F220/34
Inventor 康朝权
Owner 商南天和泥浆有限公司
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