An electronically controlled toe end fracturing sleeve

Abstract

The invention discloses an electric control digital end fracturing sliding sleeve comprising a sliding sleeve inner cylinder, a sliding sleeve outer cylinder and a sliding sleeve body. The fracturing sliding sleeve further comprises a driving cylinder body, a pressure-transmitting passageway, a radial passageway, a sealing rod and a displacement sensor. The two ends of the driving cylinder body are connected with a conversion connector and an upper connector correspondingly, an inner cavity of the driving cylinder body communicates with an inner cavity of the sliding sleeve inner cylinder, and the side wall of the driving cylinder body is internally provided with a control assembly, a motor driver and a motor which are sequentially and electrically connected. The pressure-transmitting passageway is formed in the side wall of the conversion connector in the axial direction. The radial passageway is formed in the side wall of the conversion connector and communicates with the pressure-transmitting passageway and the inner cavity of the driving cylinder body. The sealing rod is connected with the motor and used for opening or blocking the pressure-transmitting passageway. The displacement sensor is arranged in the radial passageway, used for detecting the position of the sealing rod and electrically connected with the control assembly. According to the electric control digital end fracturing sliding sleeve, through electric signals, opening of the sliding sleeve is accurately and reliably controlled, and uncertainty caused due to the fact that in the prior art, opening of a sliding sleeve is controlled through pressure is avoided, the success rate of smooth opening of the sliding sleeve is increased, and well cylinder safe pressure test is achieved.

Description

technical field [0001] The invention relates to the field of natural gas exploitation, in particular to an electrically controlled toe-end fracturing sliding sleeve. Background technique [0002] Shale gas is an unconventional natural gas that hides in shale or mudstone layers in a free or adsorbed state. Shale gas can be used as civil and chemical fuels, as well as chemical and power generation. At present, shale gas is mainly exploited by coiled tubing and horizontal well staged fracturing technology. For shale gas wells with a reservoir depth of more than 3500 m and a horizontal section length of more than 1500 m, when the horizontal well staged fracturing technology is used, due to the limitation of the operation length of the coiled tubing, it is necessary to use the toe-end fracturing sleeve to establish the first horizontal well section. A section of the fracturing channel before subsequent fracturing operations can be performed. When establishing the first fracturi...

AI Technical Summary

Problems solved by technology

[0006] In the blasting fracturing control valve provided by the prior art, the blasting bombs are destructive to a certain extent, which can easily damage the surrounding casing and affect the normal exploitation of shale gas.

Moreover, blasting bombs are dangerous to a certain extent, resulting in a higher risk of sliding sleeve opening operations

In addition, since the pressure to activate the detonation device is greater than the pressure test pressure (that is, the pressure for safe operation in the well), it is impossible to determine whether the shale gas well is under a safe operating pressure when the blasting bomb is blasted, and there are certain safety hazards

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