Degradable resin nano-composite material for oil and gas field operation and preparation method thereof

Abstract

The invention provides a degradable resin nano-composite material for oil and gas field operation and a preparation method thereof. The preparation method of the composite material comprises the steps of using two or three polymers of polycaprolactone, polybutylenes succinate and polylactic acid as raw materials, adding inorganic nano-materials and chain extender, performing melt-mixing reaction to prepare resin nano-alloy, i.e., the degradable resin nano-composite material for oil and gas field operation. The composite material is prepared by adopting the method, can be prepared into sheets, powder, particles, spheres and the like, or can be prepared into sheets, powder, particles, spheres and the like by using mixture of one of polycaprolactone, polybutylenes succinate and polylactic acid and the inorganic nano-materials, is used for temporary plugging and filtration reduction to protect reservoirs and temporary plugging of blast holes and constructed layer sections and the like during various construction operations (drilling, well completion, well repair and acid fracturing) in oil and gas fields, and has the advantages of complete degradability and zero harm to formations.

Description

technical field [0001] The invention relates to a degradable resin nanocomposite 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, and workover 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. Or in the acidizing process of oil and gas wells, for heterogeneous reservoirs, it is necessary to temporar...

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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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