Toe end sliding sleeve and oil well tubular column thereof

Abstract

The invention provides a toe end sliding sleeve and an oil well tubular column thereof, the toe end sliding sleeve comprises a body joint, the body joint is provided with an axial through hole, a pressure transmission hole, a rupture disk mounting hole and a rotary conduction valve assembly mounting hole, the pressure transmission hole and the axial through hole are arranged in parallel at an interval, the rupture disk mounting hole is arranged along the radial direction of the body joint and is respectively communicated with the pressure transmission hole and the axial through hole, the rotary conduction valve assembly mounting holes are formed in one side of the rupture disk mounting hole in parallel at intervals; a sliding sleeve protection sleeve which is fixedly arranged outside the body connector in a sleeving mode, an annular space is formed between the sliding sleeve protection sleeve and the body connector, and the pressure transmission hole is communicated with the annular space; a sliding sleeve which is arranged in the annulus through a shear pin; a rupture disk which is arranged in the rupture disk mounting hole and can seal the pressure transmission hole; and a rotary conduction valve assembly which is arranged in the rotary conduction valve assembly mounting hole, and the rotary conduction valve assembly can control opening and closing of the pressure transmission hole. The purpose that the sliding sleeve is automatically opened to establish a fracturing channel on the premise that the pressure value does not exceed the test pressure value can be achieved.

Description

technical field [0001] The invention relates to the field of petroleum drilling and completion engineering, in particular to a toe-end sliding sleeve and an oil well pipe string thereof. Background technique [0002] With the continuous advancement of drilling technology, the horizontal section of oil and gas wells is getting longer and longer, and the first-stage fracturing operation, which mainly focuses on transmission perforation, will face difficulties in guaranteeing perforation in ultra-long horizontal section wells and deep shale gas horizontal wells. New challenges such as gun down to the bottom of the well and high operational risks. However, the opening pressure of various cementing toe valves or toe sliding sleeves in the prior art is mostly unstable and lower than the rated pressure test value of the wellbore after casing cementing (the full wellbore pressure test pressure of the casing is pressure The maximum pressure value of the fracturing operation), that i...

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Problems solved by technology

[0002] With the continuous advancement of drilling technology, the horizontal section of oil and gas wells is getting longer and longer, and the first-stage fracturing operation, which mainly focuses on transmission perforation, will face difficulties in guaranteeing perforation in ultra-long horizontal section wells and deep shale gas horizontal wells. New challenges such as gun down to the bottom of the well and high operational risks

However, the opening pressure of various cementing toe valves or toe sliding sleeves in the prior art is mostly unstable and lower than the rated pressure test value of the wellbore after casing cementing (the full wellbore pressure test pressure of the casing is pressure The maximum pressure value of the fracturing operation), that is, it cannot meet the requirements of the full wellbore pressure test before the first fracturing of the oil and gas well. Inconvenience

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