Indepth fluid diverting agent of oil reservoir and preparation method and application of indepth fluid diverting agent

A diverting agent, deep technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of fast gelation speed, complicated preparation process, difficult control, etc., to improve temperature resistance and simple preparation process , inject the effect of easy

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

Since this kind of gel particles is still prepared by using acrylamide or acrylic acid as a monomer, it is still seriously affected by factors such as temperature, salinity, and formation shear, and the preparation process is complicated and difficult to control.
[0005] CN 102127410A discloses a slow-swelling pre-crosslinked gel body swelling granule and its preparation method. It is formulated with speed control agent, performance modifier, water, etc. However, when the cross-linking agent is chromium cross-linked or phenolic resin cross-linked, the gelling speed is fast, the applicable temperature of the oil reservoir does not exceed 80 ℃, and the salinity resistance No more than 10,000 mg / L. When plugging formation fractures or large pores, the concentration of the agent is high and the cost is high. Because the raw materials are highly toxic to the human body and seriously pollute the environment, the scope of application is narrow, which is not conducive to large-scale oil fields. Promote application

Method used

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  • Indepth fluid diverting agent of oil reservoir and preparation method and application of indepth fluid diverting agent
  • Indepth fluid diverting agent of oil reservoir and preparation method and application of indepth fluid diverting agent

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This embodiment provides a deep reservoir fluid diversion agent, which comprises the following composition:

[0029] Acrylamide: 25wt%;

[0030] Dimethyldivinylsilane: 2wt%;

[0031] α-Methylstyrene: 15wt%;

[0032] Methylenebisacrylamide: 0.05wt%;

[0033] Sodium persulfate: 0.04wt%;

[0034] Sodium polymethacrylate: 1wt%;

[0035] Aqueous zinc stearate: 5wt%;

[0036] The balance is water.

[0037] The reservoir deep liquid flow diversion agent is prepared through the following steps:

[0038] Add acrylamide and α-methylstyrene to the reaction kettle, heat it to 60-80°C, keep stirring, add methylenebisacrylamide, sodium persulfate and sodium polymethacrylate, and react for 1-2h Finally, add water-based zinc stearate, stir continuously until an independently dispersed polymer microsphere suspension with high viscoelasticity is formed, and then undergo precipitation and separation to obtain a deep reservoir liquid flow diversion agent.

Embodiment 2

[0040] This embodiment provides a deep reservoir fluid diversion agent, which comprises the following composition:

[0041] Methacrylamide: 30wt%;

[0042] Trivinylmethylsilane: 10wt%;

[0043] Phenoxyethyl methacrylate: 20wt%;

[0044] Sodium 2-acrylamido-2-methylpropanesulfonate: 0.08wt%;

[0045] Ammonium persulfate: 0.06wt%;

[0046] Gelatin: 1.5wt%;

[0047] N,N'-1,2-ethylenediylidene bis-9-octadecenamide: 8wt%;

[0048] The balance is water.

[0049] The reservoir deep liquid flow diversion agent is prepared through the following steps:

[0050] Add methacrylamide and phenoxyethyl methacrylate to the reaction kettle, heat it to 60-80°C, keep stirring, add 2-acrylamido-2-methylpropanesulfonate sodium, ammonium persulfate After reacting with gelatin for 1-2 hours, add N,N'-1,2-ethylenediylidene bis-9-octadecenamide, and keep stirring until an independently dispersed polymer microsphere suspension with high viscoelasticity is formed , and then through precipitation an...

Embodiment 3

[0052] This embodiment is a performance test experiment for the deep reservoir liquid flow diversion agent prepared in embodiment 1.

[0053] The oil reservoir deep liquid flow diverting agent obtained in Example 1 was prepared into a field-use control and drive agent with a concentration of 5 wt%, and placed in an oven under different temperature conditions, and vibrated after one week to observe the dispersion state of the deep liquid flow diverting agent. The experimental results are shown in Table 1.

[0054] The state of dispersion is to observe with the naked eye whether the polymer microspheres are aggregated into agglomerates and sticky in the prepared displacing agent. Good dispersion indicates that at this temperature, the polymer microspheres can withstand the temperature environment of the formation, and can be uniformly dispersed without agglomeration; stickiness indicates that the properties of the polymer microspheres change at this temperature, which is not sui...

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Abstract

The invention provides an indepth fluid diverting agent of an oil reservoir and a preparation method and application of the indepth fluid diverting agent. The indepth fluid diverting agent comprises, by mass, 20-35wt% of acrylamide based monomers, 2-10wt% of vinyl-containing silane, 10-25wt% of arene-containing vinyl or olefine monomers, 0.03-0.1wt% of a cross-linking agent, 0.02-0.08wt% of an initiating agent, 0.5-2wt% of a dispersing agent, 2-12wt% of an anti-sticking agent, and the balance water. The invention further provides the preparation method of the indepth fluid diverting agent. The preparation method includes the steps that the acrylamide based monomers, the vinyl-containing silane, and the arene-containing vinyl or olefine monomers are mixed and then heated to 60-80 DEG C, the cross-linking agent, the initiating agent, and the dispersing agent are added, after 1-2 hours of reaction, the anti-sticking agent is added, after polymeric microsphere suspension is formed, precipitation separation is conducted, and the indepth fluid diverting agent of the oil reservoir is obtained. In addition, the invention provides the application of the indepth fluid diverting agent in profile control and oil displacement of a water injection well.

Description

technical field [0001] The invention belongs to the field of water well deep control and flooding, and in particular relates to an oil reservoir deep liquid flow diversion agent and a preparation method and application thereof. Background technique [0002] At present, technologies such as profile control and water shutoff, deep profile control and flooding, and binary flooding are mostly used in the water injection blocks of Liaohe Oilfield to improve the development effect of water flooding. Conventional profile control and water shutoff agents have poor selectivity, easy to pollute oil layers, low strength, short validity period, and smaller and smaller growth potential. At present, there are two types of deep liquid flow diversion profile control agents, one is gel type, and the other is particle type. Under formation conditions, gel-type profile control agents are prone to non-crosslinking and formation due to the influence of various factors such as on-site preparatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor 陈小凯刘德铸曾双红王浩郑猛李瑞任杰曹伟吴赞美李贞杨连行徐薇薇李明贺梦琦陈凯
Owner PETROCHINA CO LTD
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