37results about How to "Increased seal contact area" patented technology

A staged fracturing sliding sleeve used for an oil well comprises a sliding sleeve outer shell, an inner sliding sleeve, a blocking piece and a suppressing pressure control device. The sliding sleeve outer shell is used for being connected to an oil casing pipe, and a first fracturing hole is formed in the side wall of the outer shell. The inner sliding sleeve is fixed in the outer shell through a pin which penetrates through the side wall of the outer shell and the side wall of the inner sliding sleeve, and a second fracturing hole is formed in the side wall of the inner sliding sleeve, wherein the first fracturing hole and the second fracturing hole are staggered in a radial direction. The blocking piece and the suppressing pressure control device are arranged in the inner sliding sleeve. The suppressing pressure device comprises an actuating mechanism which is used for forcing the blocking piece to keep in an opened position, wherein the actuating mechanism enables the blocking piece to move to a closed position when the suppressing pressure control device receives a preset signal, seals an inner cavity of the inner sliding sleeve and forms pressure accumulation. When the pressure is increased to overcome shear force of the pin, the pin is sheared, and the inner sliding sleeve slides along the axial direction until the first fracturing hole aligns at the second fracturing hole in the axial direction of the sliding sleeve.

The invention discloses a high torsion-resistant fully sealed drill pipe threaded joint, comprising an external threaded joint and an internal threaded joint; the main end surface of the internal threaded joint of the internal threaded joint is a torus with an inclination angle, and the end hole of the internal thread is a conical hole ; The outer shoulder surface on the externally threaded joint is a torus with an inclination angle, the base of the tapered pipe thread of the externally threaded joint is an elliptical arc surface, the length of the major semi-axis of the ellipse section of the elliptical arc surface is b, and the ellipse of the elliptical arc surface The length of the minor axis of the section is 2a, and the ratio 2a / b of the minor axis length 2a to the major semiaxis length b is equal to the conical hole taper of the end hole of the internal thread; the pitch T of the external thread of the front section and the internal thread of the front section 2 Greater than or equal to the pitch T of the rear external thread and the rear internal thread 1 . It can not only effectively improve the anti-torque ability of the threaded drill pipe joint, but also the sealing surface is reliable, the elastic deformation of the sealing contact is stable, and the sealing is tight. It is very suitable for the exploration and exploitation of oil and gas deep wells, ultra-deep wells and complex wells.