Degradable temporary plugging agent for workover and preparation method thereof

CN110669484AInactive Publication Date: 2020-01-10DAGANG OIL FIELD GRP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
DAGANG OIL FIELD GRP
Publication Date
2020-01-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the field of workover operations, and particularly relates to a degradable temporary plugging agent for workover and a preparation method thereof. The degradable temporary plugging agent comprises the following components in parts by mass: 5-7% of acrylic acid, 15-21% of acrylamide, 5-15% of inorganic mineral soil, 0.002-0.005% of a polymerization inhibitor, 6-12% of a degradation promoter, 0.02-0.1% of a crosslinking agent, 0.6-1.0% of an initiator, 7-10% of corn flour and the balance of water. The degradable temporary plugging agent for workover disclosed by the invention has good degradation performance and does not need to add an additional degradation process; for high-water cut oil wells, water wells and the like, the degradable temporary plugging agent can be degraded by itself and resume operation and production only under the condition of a reservoir (under the condition of 90 DEG C, the 48-hour degradation rate can reach more than 90%).
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Description

technical field

[0001] The invention belongs to the field of well workover operations, and in particular relates to a degradable temporary plugging agent for well workover and a preparation method thereof. Background technique

[0002] Workover fluid loss is one of the biggest problems encountered in the workover operation, which not only makes the workover operation impossible, but also causes oil layer damage due to the workover fluid intrusion into the reservoir. Even if the workover operation is carried out smoothly, the oil well after operation The production recovery period is long, and even the production of oil wells cannot be restored to the production before operation. Targeted implementation of temporary plugging technology is one of the effective ways to solve such problems.

[0003] At present, the widely used temporary plugging agents can be classified into water-soluble temporary plugging agents, oil-soluble temporary plugging agents, acid-soluble temporary pl...

Claims

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