Multi-element synergic plugging agent and application thereof

A plugging agent and multi-component technology, applied in the field of multi-component synergistic plugging agents, can solve the problems of high pressure bearing strength, poor deformability, and poor pressure bearing effect of inorganic gel plugging agents

Active Publication Date: 2014-12-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the bridging agent is difficult to reasonably match the size of the leakage channel, the deformability is poor, and the cementing ability with the formation is weak. The chemical gel plugging agent has a strong retention capacity and is not limited by the size of the leakage channel, but its temperature resistance, The pressure-bearing effect is poor and the cost is high. The inorganic cement plugging agent has high pressure-bearing strength but is easy to be washed away after being diluted by the formation fluid. Other types of plugging agents also have such shortcomings

Method used

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  • Multi-element synergic plugging agent and application thereof
  • Multi-element synergic plugging agent and application thereof
  • Multi-element synergic plugging agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment provides a multi-component synergistic plugging agent, which includes components in parts by weight:

[0054] 50 parts by weight of rigid particle walnut shell particles (wherein, 40% of the walnut shell particles of the particle size distribution of 0.9-2.0mm, 60% of the walnut shell particles of the particle size distribution of 0.45-0.9mm particle size distribution), flexible material modified natural 15 parts by weight of rubber granules, 15 parts by weight of superfine filler superfine calcium carbonate, 20 parts by weight of expanded polymer particles (wherein, 50% modified lignin material, 50% part water-soluble synthetic polymer particles, and In parts by weight, the raw materials of some water-soluble synthetic polymer particles include 20 parts by weight of guar gum, 15 parts by weight of sodium acrylate, 15 parts by weight of acrylamide, 8 parts by weight of polyethylene glycol, 1.0 parts by weight of ammonium persulfate and dimethyl 2 parts b...

Embodiment 2

[0062] This embodiment provides a multi-component synergistic plugging agent, which includes components in parts by weight:

[0063] 40 parts by weight of rigid particle walnut shell particles (wherein, 40% of the walnut shell particles of 0.9-2.0mm particle size distribution, 60% of the 0.45-0.9mm particle size distribution of walnut shell particles), flexible material modified natural rubber particles 20 Parts by weight, 20 parts by weight of superfine calcium carbonate, superfine filler material, expanded polymer (30% modified lignin material, 70% part water-soluble synthetic polymer particles, in parts by weight, part water-soluble synthetic polymer The raw material of particle comprises guar gum 20 weight parts, sodium acrylate 15 weight parts, acrylamide 15 weight parts, polyethylene glycol 8 weight parts, ammonium persulfate 1.0 weight parts and ethylene glycol dimethacrylate 2 weight parts) 20 parts by weight.

[0064] The above-mentioned partially water-soluble synth...

Embodiment 3

[0071] This embodiment provides a multi-component synergistic plugging agent, which includes components in parts by weight:

[0072] 70 parts by weight of rigid particle marble particles (wherein, the marble particles of 35% 5.0-6.0mm particle size distribution, the marble particles of 30% 3.2-5.0mm particle size distribution, the marble particles of 20% 2.0-3.2mm particle size distribution Particles, 15% marble particles of 0.9-2.0mm particle size distribution), 10 parts by weight of flexible material modified natural rubber particles, 10 parts by weight of superfine calcium carbonate for superfine filler material, expanded polymer (wherein, 50% of Modified lignin material, 50% of partially water-soluble synthetic polymer particles, in parts by weight, the raw materials of partially water-soluble synthetic polymer particles include 30 parts by weight of guar gum, 20 parts by weight of sodium acrylate, 20 parts by weight of acrylamide, 10 parts by weight of polyethylene glycol...

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Abstract

The invention provides a multi-element synergic plugging agent and application thereof. The multi-element synergic plugging agent comprises the component 1 or the component 2, wherein the component 1 comprises the following components in parts by weight: 40-50 parts of rigid particles, 15-20 parts of a flexible material, 15-20 parts of an ultrafine filling material, and 15-20 parts of an expansive type polymer: the component 2 comprises the following components in parts by weight: 50-70 parts of rigid particles, 10-25 parts of a flexible material, 10-25 parts of an ultrafine filling material, and 10-30 parts of an expansive type polymer. The multi-element synergic plugging agent disclosed by the invention combines the rigid material with the flexible material, incorporates the elastoplasticity, fully utilizes the synergistic function of the materials, can effectively plug the cracks with different widths, has the performances of high bearing strength, high temperature resistance, deformability and strong binding powder of the cracked stratum, and can be applied to the leaking stoppage operation for the drilling engineering to solve the leakage problem at different degrees.

Description

technical field [0001] The invention relates to a multi-component synergistic plugging agent and its application, belonging to the technical field of additives for oil drilling. Background technique [0002] In recent years, with the deepening of oil and gas exploration and development, various lost circulation problems have become increasingly prominent in drilling pressure-depleted formations, fractured or weakly cemented formations, fracture-developed formations and formations with multiple sets of pressure series. Lost circulation is the most common and common technical problem in drilling engineering. The problems of well wall instability, collapse due to lost circulation, and blowout caused by lost circulation have been worldwide problems in the process of oil and gas exploration and development for a long time, and they have restricted the speed of exploration and development. The main technical bottleneck. At the same time, the loss of drilling fluid caused by lost ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/516
CPCC09K8/24C09K8/426C09K2208/04
Inventor 张希文刘新云张国辉
Owner PETROCHINA CO LTD
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