High intensity releasing tool

Abstract

A high intensity releasing tool comprises an upper connector, sealing rings, a shear pin, a core, sealing rings C and a lower connector. The high intensity releasing tool is characterized in that the sealing rings and the sealing rings C are embedded into a sealing groove of the core; the lower end of the upper connector is installed inside a pawl spring groove of the lower connector; the core which is provided with the sealing rings and the sealing rings C is installed inside an inner hole of the upper connector and the lower connector to enable the lower end portion of the upper connector to be exactly pressed into the pawl spring groove of the lower connector; the shear pin is installed inside a shear pin groove of the core through a shear pin hole of the upper connector. According to the releasing tool, soft sealing and bump pressing through a rubber plug are adopted, recompression is performed to shear the shear pin in an oil pipe to enable annular space to be communicated and accordingly oil casing pipes are communicated, the overflow is increased, and the pressure is dropped and then a pipe column is lifted and an outer casing, the lower connector and technique pipes which are arranged under the lower connector are released into a well, so that the releasing purpose is achieved. The high intensity releasing tool has the advantages of being simple in operation, reasonable in structural design, low in utilization cost and convenient to install and saving device production costs.

Description

technical field [0001] The invention belongs to oilfield equipment, and relates to the field of oilfield mechanical water shutoff, in particular to a high-strength hands-off tool for horizontal wells. Background technique [0002] As the oilfield enters the later stage of development, the number of hard-to-recover blocks increases, the water injection pressure is high, and the downhole string technology for layered water injection and layered squeeze injection is relatively complicated, which seriously affects the normal production of the oilfield. With the development of mechanical water plugging technology, the throwing ball type drop joint and the inverted buckle type drop joint can no longer fully meet the construction requirements, and the ball drop type is used to hold the pressure, which is easy to occur when it is used in highly inclined directional wells and horizontal wells. The steel ball cannot be sealed in place, so that it cannot be dropped. Although the curren...

AI Technical Summary

Problems solved by technology

[0002] The oilfield has entered the later stage of development, the number of difficult-to-recover blocks has increased, the water injection pressure is high, and the downhole string technology for layered water injection and layered squeeze injection is relatively complicated, which seriously affects the normal production of the oilfield

With the development of mechanical water plugging technology, the drop-off joint of the ball throwing type and the drop-off type of the reverse buckle can no longer fully meet the construction requirements, and the drop-off of the ball-dropping pressure-suppressing method is easy to occur when it is applied in highly inclined directional wells and horizontal wells. The steel ball cannot be sealed in place, so that it cannot be dropped. Although the current technology solves the above problems to a certain extent, due to its unreasonable structure, it causes cumbersome installation and use, and low work efficiency. It may even cause oil and water well overhaul operations. To solve such problems, the hidden danger of accidents must be completely eliminated from the structural design of lost tools.

Moreover, some completion pipe strings cannot be reversed and lost due to reasons such as not allowing rotation, which has brought great trouble to the construction.

Images