Downhole Infinite Stage CNC Fracturing Sleeve

Abstract

The invention discloses a downhole infinite level digital control fracture sliding sleeve, which is designed for realizing the improvement of the digital control fracturing of separate layers of an oil-gas plumb shaft, and comprises a digital control fracture sliding sleeve, a digital control blocking device and an unblocking plug. The digital control fracture sliding sleeve comprises an upper connector, a connecting sleeve, a body and a lower connector, and an inner sliding sleeve provided with a position ID card is arranged in the connecting sleeve; the digital control blocking device comprises a gland, a main body sleeve and a bottom plug, and is internally provided with a pressure lever, a reducing piston, a sealing plate, a guide pipe and a control plate which are matched with one another for moving, and a lever mechanism on the control plate is connected with a valve on the bottom plug; the unblocking plug mainly comprises an end cover, a V-shaped seal and a mandril. By the downhole infinite level digital control fracture sliding sleeve, the requirements on the improvement of multi-layer fracture and selective exploration of an oil-gas field, the full bore of a downhole pipe string is realized, liquid discharge can be performed directly, the fracture sliding sleeve can be opened by continuous oil pipes or cables and other opening and closing tools, fracture transmitting pipelines can be reduced, and labor intensity and construction risk can be reduced.

Description

technical field [0001] The invention relates to a downhole infinite-stage numerically controlled fracturing sliding sleeve, which belongs to the technical field of fracturing of oil and gas wells in oil fields. Background technique [0002] At present, single-well multi-layer stimulation is one of the effective ways to achieve single-well production. There are two main types of multi-stage fracturing methods for domestic oilfield cased wells: one is to use cable perforation and mechanical packers to conduct inter-layer fracturing. For isolation, the multi-stage fracturing transformation is completed by opening the fracturing sleeve at one time; the second is to perform hydraulic jet perforation through the hydraulic jet fracturing tool, and use the hydraulic jet effect to achieve interlayer isolation, and the jet fracturing completes the multi-stage stimulation. When the above two processes are segmented, sealing balls of different sizes are mainly used to complete the openi...

AI Technical Summary

Problems solved by technology

Due to the limitation of wellhead, wellbore, construction pipe string and tool design size, only a limited number of stages can be completed for layered fracturing.

When the formation spews out sand, the ball is easy to bury the low-yield layer, which affects the fracturing effect of the single well, and the ball on the ball seat is not conducive to the later workover operation. If the workover drilling will damage the formation again, it will affect the single well production and increase Construction risks and drilling and grinding operation costs, and the above-mentioned processes do not have the functions of post-control and selective mining

[0003] At present, foreign fracturing sleeves with unlimited stages need to use pressure guiding pipelines for pressure transmission to form ball seats. The workload of drilling is heavy, and there is a risk of leakage at the connection of pipelines. After fracturing is completed, drilling and grinding are required to realize the pipe string Full bore, high construction risk and high cost

Images