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Degradable shielding protective agent as well as preparation method and application thereof

A technology of shielding protection and raw materials, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems affecting the dehydration of the gathering and transportation system, easy to jam pumps, etc., and achieve good compatibility, good temperature resistance, and plugging high rate effect

Active Publication Date: 2018-05-22
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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  • Degradable shielding protective agent as well as preparation method and application thereof
  • Degradable shielding protective agent as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In this example, a degradable shielding protective agent is prepared. 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% bitumen, 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 embedded 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 through 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-butylphenol LY -I and potassium polyacrylate were added to water in sequence, and stirred evenly at room temperatu...

Embodiment 2

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

[0029] The 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 characterized by the ratio of the difference in permeability of the core 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 plugging performance experiment

[0031] The rock core is first evacuated, saturated with formation water displacement fluid, and the water phase permeability K1 before plugging of the rock core is measured, then the protective agent of Example 1 i...

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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, it is often necessary to use temporary plugging agents to temporarily block the oil and gas layers during workover operations, so as to avoid damage to the oil and gas layers by the fluid entering the well. The permeability of the formation can be quickly restored to achieve the purpose of protecting the reservoir. Therefore, the basic requirement for the temporary plugging agent is "can be blocked and released". [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 orde...

Claims

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Application Information

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Patent Type & Authority Applications(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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