Degradable resin material for operation of oil and gas field and preparation method thereof

Abstract

The invention provides a degradable resin material for operation of an oil and gas field and a preparation method thereof. The method comprises the step of performing a melt-mixing reaction on polymer of two or three of polyglycolic acid, butylene succinate and poly-3-hydroxybutyrate with a chain extender to prepare resin alloy, namely the degradable resin material for operation of the oil and gas field. The degradable resin material prepared by the method can be prepared into flakes, powder, particles, spheres and other shapes, or one of polyglycolic acid, butylene succinate and poly-3-hydroxybutyrate is prepared into flakes, powder, particles, spheres and other shapes. The degradable resin material can be used for temporarily plugging and reducing filtration to protect reservoirs, temporarily plugging blast-holes, constructed reservoirs and the like in various oil and gas field constructing operations, such as well drilling, completion and repairing and acid fracturing. The degradable resin material has the advantages of complete degradability and zero harm to stratum.

Description

technical field [0001] The invention relates to a degradable resin material for oil and gas field operations and a preparation method thereof, belonging to the technical field of oil and gas exploitation. Background technique [0002] In various construction operations in oil and gas fields, such as drilling, well completion, well workover or stimulation operations, fluid loss control materials are widely used to reduce the intrusion of working fluid into the reservoir and reduce its damage to the reservoir. The fluid loss control agent used can block the fractures and pores of the reservoir, thereby reducing the intrusion of working fluid, and plugging the pore throats and fractures of the reservoir. After the operation is completed, these plugging materials also block the flow of oil and gas from the reservoir. Flow into the wellbore and cause damage to the reservoir. [0003] In order to reduce the damage caused by the fluid loss control agent to the reservoir, temporary...

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Problems solved by technology

[0005] However, these temporary plugging materials have some shortcomings and deficiencies. For water-soluble temporary plugging materials, the carrier fluid needs to be organic hydrocarbons, and after the operation is completed, there needs to be a sufficient amount of water in the formation. During the subsequent liquid drainage process, The produced water in the formation dissolves it, removes its temporary blockage, and dredges the oil and gas channels. If there is not enough water in the formation, or the formation pressure is insufficient, and there is not enough water produced, it is necessary to squeeze water into the formation to dissolve these water solubles. Temporary plugging materials are often unable to be completely dissolved and removed, causing certain damage to the formation; acid-soluble temporary plugging materials, after completing the temporary plugging operation, need to inject acid to dissolve the temporary plugging materials and remove them. Clogging is not suitable for acid-sensitive reservoirs, even for non-acid-sensitive reservoirs, an additional operation is required, which increases operating costs. Since the acid solution cannot fully soak all the temporary blocking materials, it cannot be completely dissolved. Unblock the oil and gas channels; for oil-soluble temporary plugging materials, first of all, it is not suitable for gas wells, and second, it is oil wells. Since the formation crude oil only contacts the front edge of temporary plugging, when the dissolution reaches saturation, it is mainly achieved by diffusion and convection. Slow dissolution, which leads to long and insufficient contact time, and some damage to the formation

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