Novel material pressure-out ball used in staged fracturing pitching slide sleeve opening

Abstract

The invention provides a novel material pressure-out ball for a multi-stage slide sleeve staged fracturing pitching opening-type slide sleeve. The novel material pressure-out ball employs main materials such as polybenzimidazole and polyetheretherketone. The main function of the pressure-out ball is that with the pressure-out ball, pressure-out sealing can be rapidly and reliably realized, pitching slide sleeve can be opened, and fracturing can be realized. The pressure-out ball has substantial characteristics that: (1) the density is low, wherein the density is 1.5-1.6g/cm<3>, such that the capacity of pressure-out ball for rapidly moving forward in a horizontal state can be improved, and backflow is easy; (2) a composite material with main components of polybenzimidazole and polyetheretherketone is adopted, such that a high impact strength is provided, and the abrasion of the pressure-out ball in a forward moving process is small, such that reliable sealing can be realized; (3) a pressure resistance is high, wherein as a result of experiments, no damage is caused under a high pressure of 70MPa; and (4) time is saved, and construction risk is reduced.

Description

technical field [0001] The invention relates to a pressure-suppressing ball of a new material used for opening a ball-throwing sliding sleeve in the staged fracturing technology of a horizontal well, belonging to the field of petroleum exploration. Background technique [0002] The pressure holding ball is mainly used to open the ball sliding sleeve in the staged fracturing technology of horizontal wells in the field of petroleum exploration and development. The sliding sleeve is sealed to increase the pressure in the oil pipe until it is sealed with the valve seat and holds the pressure. When the pressure rises, the shear nail is cut to open the sliding sleeve, and the pressure holding ball goes down together with the sliding sleeve to close the lower part. After fracturing the oil layer, start fracturing the upper oil layer. Existing pressure-holding balls usually use steel balls or ordinary low-density balls. When using steel balls or ordinary low-density balls for fract...

AI Technical Summary

Problems solved by technology

Existing pressure-holding balls usually use steel balls or ordinary low-density balls. When fracturing horizontal wells, steel balls or ordinary low-density balls have the following defects: due to the high density of steel balls, they are not easy to move in horizontal wells. The ball usually adopts a hollow form. Because the wall of the steel pressure-holding ball is thin, it is easy to deform under high pressure. After deformation, the ball and the valve seat are not easy to seal and the seal is not reliable; It is easy to wear and break under impact, and also cannot achieve reliable sealing

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