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Temperature-sensitive gel diverting agent and preparation method and application of temperature-sensitive gel diverting agent

A temperature-sensitive gel and diverting agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of restricting the large-scale application of plugging agents, poor implementation effect, short validity period, etc. Recovery factor, improved scour resistance, and the effect of enhanced scour resistance

Inactive Publication Date: 2015-01-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned inorganic gels all have problems such as high brittleness, resistance to erosion, and short validity period; the implementation effect is poor, which restricts the large-scale application of this type of plugging agent

Method used

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  • Temperature-sensitive gel diverting agent and preparation method and application of temperature-sensitive gel diverting agent
  • Temperature-sensitive gel diverting agent and preparation method and application of temperature-sensitive gel diverting agent
  • Temperature-sensitive gel diverting agent and preparation method and application of temperature-sensitive gel diverting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of thermosensitive gel diverting agent

[0034] The temperature-sensitive gel diverting agent is composed of 1 part of acrylamide, 1 part of polyaluminum ferric sulfate, 0.5 part of potential alkali (urea), 0.05 part of N, N-methylenebisacrylamide, and 97.35 parts of tap water, and add it to the wide mouth of the plug. bottle, stirred for 15 minutes to completely dissolve, and then added 0.1 part of ammonium persulfate to obtain a temperature-sensitive gel-steering agent.

[0035] (2) Determination of gel viscosity

[0036] Take the sample in the laboratory and place it in a jar with a stopper, and observe the gelling situation in a constant temperature drying oven at 60°C. The experiment found that the diverting agent formed after 13 hours was initially gelled, and the measured apparent viscosity was 3000mPa.s .

[0037] (3) Core displacement experiment of diverting agent

[0038] Fill 60-120 mesh quartz sand into a sand-filling tube with a diameter ...

Embodiment 2

[0044] (1) Preparation of thermosensitive gel diverting agent

[0045] The temperature-sensitive gel diverting agent is composed of 2 parts of acrylamide, 2 parts of polyaluminum ferric sulfate, 1 part of latent base (urea), 0.1 part of N, N-methylenebisacrylamide, and 94.75 parts of tap water, and add it to the wide mouth of the plug. bottle, stirred for 15 minutes to dissolve it completely, and then added 0.15 parts of ammonium persulfate to obtain a temperature-sensitive gel-steering agent.

[0046] (2) Determination of gel viscosity

[0047] Take the sample in the laboratory and place it in a jar with a stopper, and observe the gelation in a 60°C constant temperature drying oven. The experiment found that the diverting agent formed after 10 hours was initially gelled, and the measured apparent viscosity was 8000mPa.s .

[0048] (3) Core displacement experiment of diverting agent

[0049]Fill 60-120 mesh quartz sand into a sand-filling tube with a diameter of 2.5 cm and ...

Embodiment 3

[0055] (1) Preparation of thermosensitive gel diverting agent

[0056] The temperature-sensitive gel diverting agent is composed of 3 parts of acrylamide, 3 parts of polyaluminum ferric sulfate, 1.5 parts of potential alkali (urea), 0.15 parts of N, N-methylenebisacrylamide, and 93.15 parts of tap water, and add it to the wide mouth of the plug. bottle, stirred for 15 minutes to completely dissolve, and then added 0.2 parts of ammonium persulfate to obtain a temperature-sensitive gel-steering agent.

[0057] (2) Determination of gel viscosity

[0058] Take the sample in the laboratory and place it in a jar with a stopper, and observe the gelling situation in a constant temperature drying oven at 60°C. The experiment found that the diverting agent formed after 10 hours was initially gelled, and the measured apparent viscosity was 21000mPa.s .

[0059] (3) Core displacement experiment of diverting agent

[0060] Fill 60-120 mesh quartz sand into a sand-filling tube with a dia...

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Abstract

The invention provides a temperature-sensitive gel diverting agent and a preparation method and application of the temperature-sensitive gel diverting agent. The temperature-sensitive gel diverting agent is mainly prepared from the following components in parts by weight: 1-3 parts of acrylamide, 1-3 parts of an inorganic material, 0.5-1.5 parts of potential alkali, 0.05-0.15 part of a cross-linking agent, 0.1-0.2 part of an initiator and the balance of water, wherein the components are 100 parts in total weight. The novel temperature-sensitive gel diverting agent synthesized by the invention also has certain erosion resistance besides the characteristics of certain jelly strength and adjustable gelling time (5-20 hours), and is capable of prolonging the validity period of profile control of a water injection well by the gel, the subsequently injected water is compelled to turn to an oil reservoir with relatively low permeability, and the water injection wave and efficiency and the oil recovery factor can be improved.

Description

technical field [0001] The invention relates to the technical field of oil recovery in the oil field development process, in particular to a temperature-sensitive gel diverting agent and its preparation method and application. Background technique [0002] Long-term water flooding in water-flooded oilfields leads to deteriorating heterogeneity of reservoirs in high-water-cut oilfields. The three major contradictions intensify, especially the plane and intralayer contradictions, resulting in low efficiency of injected water, serious ineffective circulation, and greatly reduced water flooding efficiency. Water production from oil and gas wells is a common problem in oilfield development. As the water injection edge advances, due to serious formation heterogeneity, different oil-water mobility ratios, and improper development plans and measures, etc., the water cut in the oilfield will increase faster. , leading to premature water flooding of the oil layer and lower oil recover...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/512C09K8/5083
Inventor 刘平德张松魏发林杨立民熊春明
Owner PETROCHINA CO LTD
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