Switchable fracturing sleeve

Abstract

The invention discloses a switchable fracturing sliding sleeve designed for fishing of balls and fishable ball seats and selective mining of productive sections after multi-layer multi-stage fracturing transformation of oil and gas wells. The switchable fracturing sliding sleeve mainly comprises a fracturing port, an outer barrel, a switchable sliding sleeve body, a fishable ball seat, a fishing thread and the like, wherein the outer barrel is connected with upper and lower joints, the switchable sliding sleeve body is arranged in the outer barrel, the fishable ball seat is disposed in the switchable sliding sleeve body, and the fishing thread is arranged on the fishable ball seat. According to the switchable fracturing sliding sleeve, the multi-stage fracturing construction can be completed, the balls and the fishable ball seat can be fished once through dedicated fishing tools, a shaft becomes through after fishing, the capacity of wells can be played to the utmost without affecting conventional borehole operations or usage of testing tools, and the switchable sliding sleeve body can be opened and closed by a dedicated tool to achieve selective mining; risks and costs of drilling of the balls and the fishable ball seat can be reduced greatly, the ball seat range can be narrowed, the staged fracturing section number can be improved, and service lives of oil and gas wells can be prolonged.

Description

technical field [0001] The invention relates to a switchable fracturing sliding sleeve, which belongs to the technical field of downhole control tools in the petroleum industry. Background technique [0002] With the continuous exploitation of oil resources in the world, oil and gas resources with better reservoir properties and relatively easy exploitation are becoming less and less. Therefore, a large number of low-grade oil and gas resources with complex reservoir properties and low single-well production are becoming oil and natural gas production resources. In order to effectively develop oil and gas fields with poor reservoir physical properties, increasing production is the key. Especially in the face of tight oil layers and tight gas layers, producing more layers in vertical wells or producing more stages in horizontal wells has become a trend in recent years to improve low permeability. A means of single well production in oil and gas fields, these means have been p...

AI Technical Summary

Problems solved by technology

At present, due to large-displacement construction, the proppant will wear the ball seat of the fracturing sleeve, causing the ball to be stuck, and the problem of the fracturing ball being stuck on the ball seat occurs from time to time, causing the well to fail to produce normally. The difference between the ball seat can not be achieved very small

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