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A kind of degradable shielding protective agent and its preparation method and application

A technology for shielding protection and raw materials, applied in the field of reservoir protective agent and shielding protective agent, can solve the problems affecting the dehydration of the gathering and transportation system, easy to get stuck on the pump, etc., and achieves good compatibility, good temperature resistance, and crosslinking time. control effect

Active Publication Date: 2020-05-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, my country has vigorously promoted the shielding temporary plugging technology during well workover operations. Although water-soluble, acid-soluble and oil-soluble temporary plugging agents have been widely used, in order to improve the temporary plugging strength and temperature resistance, a certain amount of Solid phase powder particles, but there are problems that the pump is easy to get stuck and affects the dehydration of the gathering and transportation system

Method used

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  • A kind of degradable shielding protective agent and its preparation method and application
  • A kind of degradable shielding protective agent and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In this example, a degradable shielding protective agent is prepared. The degradable shielding protective agent is 100% by weight. The raw materials of the degradable shielding protective agent are: 0.5% high-viscosity polyanionic cellulose PAC-HV, 4% amide modified starch Copolymer YX-I, 2.5% pitch, 0.7% coal gangue powder, 0.4% lignite, 4% sulfomethyl phenolic resin, 0.5% quaternary ammonium cationic starch ether CCS-03, 0.36% propylene glycol intercalation Segment polyether F38, 0.28% p-tert-butylphenol LY-I, 0.15% potassium polyacrylate (molecular weight 12 million) and the balance water.

[0024] The above-mentioned degradable shielding protective agent is prepared by the following steps:

[0025] Polyanionic cellulose, amide modified starch copolymer YX-I, asphalt, coal gangue powder, lignite, sulfomethyl phenolic resin, quaternary ammonium cationic starch ether, propylene glycol block polyether F38, p-tert-butyl phenol LY -I and potassium polyacrylate are added to wa...

Embodiment 2

[0028] The degradable shielding protective agent of Example 1 was subjected to indoor core simulation experiments to test the permeability before and after plugging, and to investigate the temperature resistance and sealing strength of the protective agent. The experimental results are shown in Table 1.

[0029] Temperature resistance and plugging strength are verified according to the plugging rate index of the protective agent under different high temperature conditions. The plugging rate is the ratio of the core permeability before and after the protective agent to the permeability before the protective agent. The blocking effect of the blocking agent.

[0030] (1) Temperature resistance and blocking performance test

[0031] First evacuate the core, saturate it with formation water displacement fluid, measure the water permeability K1 of the core before plugging, then inject the protective agent of Example 1 into the core, and put the finished core into a distilled water In the ...

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Abstract

The invention provides a degradable shielding protective agent as well as a preparation method and application thereof. The degradable shielding protective agent is prepared from the following materials: polyanionic cellulose, acid amide-modified starch copolymer YX-I, asphalt, coal gangue powder, lignite, sulphonated methyl phenolic resin, quaternary ammonium type cationic starch ether, propyleneglycol segmented polyether F38, p-tert-butylphenol LY-I, potassium polyacrylate and the balance of water. The degradable shielding protective agent can be used for temporarily blocking a well for high-temperature thick oil reservoir. The invention further provides a preparation method for the degradable shielding protective agent. The protective agent is degradable, is easy to prepare, is controllable in cross-linking time, has strong blocking performance and high temperature resistance, does not contaminate the oil reservoir, and has no impact on dehydration of a combined station.

Description

Technical field [0001] The invention relates to a protective agent for oil reservoirs, in particular to a degradable shielding protective agent suitable for high-temperature heavy oil reservoirs, and belongs to the technical field of petroleum exploitation. Background technique [0002] In the development of oil and gas fields, temporary plugging agents are often used to temporarily plug the oil and gas reservoirs during workover operations to prevent the fluid entering the well from damaging the oil and gas reservoirs. After the workover operations are completed, the temporary plugging agents can flow back and degrade in time, so that the storage The permeability of the layer is quickly restored to achieve the purpose of protecting the reservoir. Therefore, the basic requirement for the temporary plugging agent is "can be blocked and untie". [0003] At present, my country has vigorously promoted the temporary plugging technology during workover operations. Although water-soluble,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/514
CPCC09K8/514
Inventor 刘强王浩滕立勇沈文敏李瑞马昌明匡旭光陈小凯王尧杨洋黄腾袁东旭娄帅井德源刘建山管紫君郝英敏
Owner PETROCHINA CO LTD
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