High-temperature-resistant tough degradable temporary plugging agent and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant tough degradable temporary plugging agent and a preparation method thereof. The temporary plugging agent is prepared from the following componentsand raw materials in parts by weight: 80 to 90 parts of polyglycolic acid, 10 to 20 parts of polyester elastomer, 1 to 5 parts of plasticizer, 2 to 8 parts of compatilizer, 0.5 to 3 parts of antioxidant, 0.5 to 3 parts of nucleating agent, 0.2 to 1 part of crystallization promoter, 0.4 to 2 parts of hydrolysis regulator, 5 to 15 parts of lubricant and 0.5 to 2 parts of heat stabilizer. The temporary plugging agent has good high-temperature resistance and toughness, can still keep enough mechanical strength under the high-temperature condition, can be automatically degraded and easily removedafter being used, does not influence an underground reservoir, can effectively improve the construction efficiency of underground temporary plugging steering fracturing, and reduces the construction cost.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and relates to a degradable temporary plugging agent with high temperature resistance and toughness and a preparation method thereof. Background technique [0002] As we all know, oil and gas resources such as oil or natural gas are produced through the exploitation of wells (oil wells or gas wells, sometimes collectively referred to as "pit wells") containing porous and permeable underground layers. However, in recent years, with the continuous exploitation of oil and gas fields, the quality of reservoirs will decline year by year. For this reason, relevant oil and gas producers often use reservoir fracturing to improve the permeability of underground reservoirs, so as to continue to effectively remove these Exploitation of oil and gas resources in underground reservoirs. However, for heterogeneous low-permeability reservoirs characterized by relatively dispersed ...

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Problems solved by technology

For example, the invention patent with the publication number CN109233773A discloses a non-linear self-degradable temporary plugging agent for multi-cluster fracturing reconstruction in a stage. The temporary plugging agent is made of polyglycolide, polylactide-glycolide and polyvinyl alcohol The composed mixture is used as the main body, supplemented with initiator, lubricant, molding agent, reinforcing agent, and degradation-promoting agent, and is made by extruding and granulating; although the temporary plugging agent disclosed in this patent does not stick to water at normal temperature, it is beneficial to pump injection, and the dissolution rate and time can show a nonlinear relationship at the reservoir temperature, but its rigidity is relatively high and its toughness is poor, which is not conducive to the mutual accumulation of temporary plugging particles to form a stable low-permeability plugging with a pressure-bearing effect layer, and its thermal stability is poor under high temperature conditions, it is easy to lose strength quickly, and it is difficult to maintain a stable pressure bearing effect