Abb Vetco Gray Incorporated

Other

David D Comeaux

Noel A Monjure

Kenneth Sikes, Sr

Francis R Bobbie

Michael Jon Scott

Frank Ditta

R Lewis Ropp

Larry M Young

Tim Gus Wolcott

Ralph Lewis Ropp

An apparatus for insertion into a well to displace well fluid. A flexible hose is lowered into an annulus between strings of casing. A nozzle is affixed to the lower end of the hose. During insertion, the hose is pressurized and rigid to keep the hose from winding about the well. To keep the hose rigid, internal pressure is maintained in the hose. The nozzle is provided with a check valve that holds the internal pressure up to a selected amount. Once the hose is lowered to a desired depth, the operator increases the pressure sufficiently in the hose to open the check valve, thereby allowing heavy liquid to flow out. The heavy liquid displaces the lighter well production, which flows out of the outlet. After the heavy fluid has been dispensed, the internal pressure is reduced, causing the check valve to close. The check valve can also be opened during insertion, if desired.

Variable pressure pump through nozzle

A casing annulus remediation system for lowering a flexible hose into an annulus between strings of casing in a petroleum well by pressurizing the hose so that the hose is rigid and may be forced down the annulus. It is necessary to insert the hose through an outlet into the annulus region for well fluid displacement when pressure builds up in the annulus between casing strings due to leaks in the casing. Pressure build-up in the annulus is reduced by pumping a heavy liquid, sealant or other media through the hose into the annular space experiencing the pressure build-up. A tubing nose is affixed to the lower end of the hose. The hose may be inserted hundreds of feet into the well. Therefore, the hose is pressurized to maintain rigidity to keep the hose from winding about the well during deployment. To keep the hose rigid, internal pressure is maintained in the hose. The tubing nose is provided with a check valve that holds the pressure. Once the hose is lowered to a desired depth, an operator may increase the pressure sufficiently in the hose to open the check valve, thereby allowing heavy liquid to flow out. The heavy liquid displaces the lighter well product, which flows out of the outlet. A terminal fitting assembly is attached to an upper end of the hose and is secured within an access port in the wellhead member. The terminal fitting assembly has a check valve therein, and the hose may be left in the tubing head assembly so that fluids may be pumped through the hose at selected time thereafter.

Casing annulus remediation system

A casing annulus remediation system for overcoming problems associated with lowering a flexible hose into an annulus between strings of casing in a petroleum well by pressurizing the hose so that the hose is rigid and may be forced down the annulus. It is necessary to insert the hose through an outlet into the annulus region for brine displacement when pressure builds up in the annulus between casing strings due to leaks in the casing. Pressure build-up in the annulus is reduced by pumping a heavy liquid through the hose into the annular space experiencing the pressure build-up. A nozzle is affixed to the lower end of the hose. The hose may be inserted several hundred feet into the well. Therefore, the hose is pressurized to maintain rigidity to keep the hose from winding about the well during deployment. To keep the hose rigid, internal pressure is maintained in the hose. The nozzle is provided with a burst disk that holds the pressure. Once the hose is lowered to a desired depth, an operator may increase the pressure sufficiently in the hose to break the disk, thereby allowing heavy liquid to flow out. The heavy liquid displaces the lighter well product, which flows out of the outlet. An injection sealer at the surface seals around the hose. A gate valve is employed to shear the hose in the event of an emergency.

A gate valve has a relief passage to prevent excessive pressure buildup in the cavity of the body in the event of a fire. The gate valve has an upstream passage side and a downstream passage side that intersect the cavity. Seat rings are located at the intersection of the upstream and downstream passage sides with the cavity. A split gate moves between open and closed positions with the seat rings. A relief passage extends from the cavity to the upstream passage side. A frangible device locates in the relief passage to block flow during normal operation. If the pressure differential between the cavity and the upstream side exceeds a selected minimum, the frangible member breaks, allowing flow through the relief passage. This relieves pressure in the cavity.

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Sugarland, TX, United States of America

David D Comeaux