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Temporary plugging agent for horizontal well water control, and preparation method and application thereof

A temporary plugging agent and horizontal well technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of uncontrollable degradation time, damage to oil layers, oil layer damage, etc., and achieve adjustable degradation time and plugging ability Strong, damage-reducing effect

Active Publication Date: 2015-04-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, organic resin and plugging microspheres are the most widely used. The polymer temporary plugging agent has a good plugging effect due to its strong chemical cross-linked network structure, but it has a slow degradation rate and will cause a certain degree of damage to the oil layer; Plugging microspheres have the characteristics of high plugging strength and small deformation, but the disadvantage is that the degradation time is uncontrollable
[0006] Therefore, it is necessary to develop a temporary plugging control agent for horizontal well water to solve the technical problem of slow and incomplete degradation of conventional oil well water plugging temporary plugging agents and damage oil layers.

Method used

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  • Temporary plugging agent for horizontal well water control, and preparation method and application thereof
  • Temporary plugging agent for horizontal well water control, and preparation method and application thereof
  • Temporary plugging agent for horizontal well water control, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This embodiment provides a temporary plugging agent for horizontal well water control and its performance testing experiment.

[0037] The temporary plugging agent is prepared through the following steps:

[0038] 93.4 parts of tap water, 4 parts of acrylamide, 0.5 parts of polypropylene fiber, 1.5 parts of sepiolite, 0.5 parts of composite crosslinking agent (mass ratio of 10:4 polyethylene glycol diacrylate and N,N-methylene base bisacrylamide), added to a stoppered jar, stirred for 20 minutes to completely disperse and dissolve, then added 0.10 parts of ammonium persulfate, left to react for 1-3 hours, and prepared horizontal well water control Temporary blocking agent.

[0039] Performance test experiment of the above temporary plugging agent:

[0040] (1) Determination of viscosity of temporary plugging agent

[0041] Take the sample in the laboratory and place it in a jar with a stopper, and observe the gelation in a constant temperature drying oven at 60°C. Th...

Embodiment 2

[0052] This embodiment provides a temporary plugging agent for horizontal well water control and its performance testing experiment.

[0053] The temporary plugging agent is prepared through the following steps:

[0054] 91.4 parts of tap water, 5 parts of acrylamide, 1 part of polypropylene fiber (6-8 mm in length, 5-10 μm in diameter), 2 parts of sepiolite, 0.5 parts of composite cross-linking agent (polymer with a mass ratio of 10:3) A mixture of ethylene glycol diacrylate and N, N-methylenebisacrylamide), added to a stoppered jar, stirred for 20 minutes to completely disperse and dissolve, then added 0.10 parts of ammonium persulfate, static Put it in the reaction for 1-3h to prepare the temporary plugging agent for horizontal well water control.

[0055] Performance test experiment of the above temporary plugging agent:

[0056] (1) Determination of viscosity of temporary plugging agent

[0057] Take the sample in the laboratory and place it in a jar with a stopper, an...

Embodiment 3

[0068] This embodiment provides a temporary plugging agent for horizontal well water control and its performance testing experiment.

[0069] The temporary plugging agent is prepared through the following steps:

[0070] 86.25 parts of tap water, 8 parts of acrylamide, 2 parts of polypropylene fiber (6-8 mm in length, 5-10 μm in diameter), 3 parts of sepiolite, 0.6 parts of composite cross-linking agent (polypropylene fiber with a mass ratio of 10:2) A mixture of ethylene glycol diacrylate and N, N-methylenebisacrylamide), added to a stoppered jar, stirred for 20 minutes to completely disperse and dissolve, then added 0.15 parts of ammonium persulfate, static Set to react for 1-3h to obtain temporary plugging agent for horizontal well water control.

[0071] Performance test experiment of the above temporary plugging agent:

[0072] (1) Determination of viscosity of temporary plugging agent

[0073] Take the sample in the laboratory and place it in a jar with a stopper, and...

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Abstract

The invention provides a temporary plugging agent for horizontal well water control, and a preparation method and application thereof. The temporary plugging agent for horizontal well water control comprises the following raw materials in parts by weight: 4-15 parts of acrylamide, 0.5-3 parts of polypropylene fiber, 1.5-4 parts of reinforcer, 0.5-1.0 part of composite crosslinking agent, 0.1-0.2 part of initiator and the balance of water, totaling 100 parts. The composite crosslinking agent is a mixture composed of polyethyleneglycol diacrylate and N,N-methylene-bis acrylamide in a mass ratio of 10:(1-4). The preparation method of the temporary plugging agent comprises the following steps: sequentially adding the acrylamide, polypropylene fiber, reinforcer and composite crosslinking agent into water, stirring uniformly, adding the initiator, and standing to react for 1-3 hours, thereby obtaining the temporary plugging agent. The invention also provides application of the temporary plugging agent in horizontal well water control. The temporary plugging agent provided by the invention has the characteristics of high gelling viscosity, controllable degradation time, thorough degradation and the like, can plug the high-permeability zone and implement adjustable degradation time, and can lower the damage to the reservoir.

Description

technical field [0001] The invention relates to the technical field of oil recovery in the process of oilfield development, in particular to a temporary plugging agent for horizontal well water control, a preparation method and application thereof. Background technique [0002] The horizontal well section is 200-600m long. Due to production system, reservoir heterogeneity and other reasons, it is easy to cause uneven liquid production profile, partial breakthrough of edge and bottom water or injected water, and excessive water cut rise. By blocking the water outlet section, the water outlet can be effectively suppressed, the liquid production profile can be balanced, the undeveloped potential parts can be activated, and the overall development efficiency of the horizontal well can be improved. [0003] For the plugging of the outlet section, mechanical means can be used to adopt the method of segmented and directional plugging, but it needs to meet the requirements of good w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor 刘平德魏发林熊春明杜政学张娜
Owner PETROCHINA CO LTD
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