Water-controlling and scale-inhibiting coated proppant and preparation method thereof

Abstract

The invention discloses a water-controlling and scale-inhibiting coated proppant and a preparation method thereof. The water-controlling and scale-inhibiting coated proppant is prepared from the following components in percentage by mass: 60 to 80% of an aggregate, 5 to 15% of resin, 1 to 5% of a curing agent, 1 to 5% of a plasticizer, 4 to 8% of a water-controlling agent, 1 to 3% of a scale inhibitor and 1 to 3% of a pore-forming agent. The water-controlling and scale-inhibiting coated proppant is relatively low in density and easy for fracturing construction; the water control agent in the coating layer is oleophylic and hydrophobic, so that the purposes of controlling water and increasing oil can be achieved; the scale inhibitor in the water-controlling and scale-inhibiting coated proppant can play a role in formation water production to prevent formation of inorganic scale; in the later period of production, a pore throat structure in the coated porous proppant can provide a flowing channel for formation fluid, and the reduction degree of long-term flow conductivity of a filling crack under the action of closing pressure can be effectively reduced; meanwhile, the coated proppant also has a sand prevention function.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a film-coated proppant for controlling water and scale and a preparation method thereof. Background technique [0002] In the field of oil and gas field development, the stimulation method of fracturing is often used for low-permeability and ultra-low-permeability reservoirs, that is, the high-pressure pump set is used to squeeze the fracturing fluid into the formation with a displacement exceeding the limit fluid absorption speed of the formation. Artificial fractures are formed and filled with proppant to form a channel with high conductivity for oil and gas entering the well. [0003] At present, the widely used proppants are quartz sand and ceramsite. Although the two have wide sources and low cost, their density is high, and they are easy to cause sand plugging during fracturing construction, which brings a series of construction problems. On the other...

AI Technical Summary

Problems solved by technology

For example, in order to ensure the compressive strength of the membrane proppant, it is necessary to ensure the content of resin in the coating layer, thus reducing the content of other functional additives, making the function of the membrane proppant relatively single

On the other hand, although the existing film-coated proppant has better compressive strength than the traditional proppant, it is easy to be crushed under the action of long-term closure pressure, so that the long-term conductivity of the fracture filling is also limited to a certain extent. reduction of

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