초록 ▼

A flow control mechanism for high pressure wells comprises a body structure having inlet and outlet passages and adapted for connection to a wellhead in such manner that a metering device meters the flow of production fluid through the inlet and outlet passages. The body structure defines an access

A flow control mechanism for high pressure wells comprises a body structure having inlet and outlet passages and adapted for connection to a wellhead in such manner that a metering device meters the flow of production fluid through the inlet and outlet passages. The body structure defines an access opening that is ordinarily maintained closed by a closure element received within the access opening. An annular sealing element is received within an annulus defined between the body structure and the closure element and is formed to define a frusto-conical sealing surface that engages a frusto-conical seat surface defined by the closure element and establishes a high pressure seal between the body structure and closure element. The sealing element is composed of a hard metal such as steel and the sealing surface defined thereby is of slightly differing angle as compared to the angle of the seat surface, thus causing the sealing element to yield radially outwardly upon assembly by virtue of a camming activity to provide a seal both against the seat surface and with respect to the body structure. The sealing element is partially impregnated and coated with a friction-resistant polymer such as polytetrafluoroethylene.

대표청구항 ▼

A flow control choke mechanism for high pressure well service, said flow control mechanism comprising: a body strucure defining intersecting inlet and outlet flow passage means and an access opening in substantial alignment with said inlet passage means, said body structure being adapted for connect

A flow control choke mechanism for high pressure well service, said flow control mechanism comprising: a body strucure defining intersecting inlet and outlet flow passage means and an access opening in substantial alignment with said inlet passage means, said body structure being adapted for connection in flow controlling relation with a wellhead assembly; a flow bean being positioned within said inlet passage means and defining a restricted passage through which production fluid flows; a closure element being positioned within said access opening of said body structure and having an enlarged inner extremity defining an external frusto-conical seat surface facing outwardly; an annular metal seal element being received within said body structure and positioned about said closure element, said metal seal element having a maximum hardness of 120 brinnel and being formed to define an internal frusto-conical sealing surface facing inwardly and being of differing angle as compared to the angle of said external frusto-conical sealing surface of said closure element, said metal seal element also being formed to define an annular abutment surface, the radially outer portion of said internal frusto-conical surface establishing line contact with said external fruso-conical surface upon initial engagement and said seal element being deformable upon high mechanical loading to establish surface contact between said internal and external frusto-conical surfaces and between said seal element and said body structure; a retainer element being at least partially positioned within said body and being positioned about said closure element, said retainer element defining an annular shoulder that engages said abutment surface of said seal element; and means securing said retainer element against said abutment surface of said seal element with sufficient force to induce radial yielding of said seal element and establish substantially full surface sealing engagement between said seat surface and sealing surface and establish sealing engagement between the outer portion of said seal element and said body structure.