Abstract: A stab for a gas-lift injection line is disclosed which includes a built-in check valve to exclude seawater as the stab is being delivered to the subsea manifold. The check valve can be a spring-loaded poppet which can be pressure-balanced with the surrounding hydrostatic forces, or alternatively, preloaded with the use of a pressurized chamber working in conjunction with a biasing spring to hold the check valve in the closed position during delivery. After insertion of the stab into the subsea manifold, the gas flow begins in the stab, which overcomes the forces of the spring and/or pressurized compartment to push the check valve into the open position to allow gas-lift flow through the manifold and down the annulus into the gas-lift valves in the well. Bypass flow passages are incorporated into the plug to provide an additional force to hold the plug in the open position once the gas-lift pressure is applied so as to prevent chattering of the check valve component in the stab.

Abstract: A connection is disclosed which is particularly applicable to subsea wellheads. A female receptacle end is provided on the wellhead which has connections on it to an umbilical or a flowline. The male end has an orientation lug for rough orientation. Once rough orientation is made, the male end is advanced into the female end and the shaft rotated by a remotely operated vehicle (ROV) for alignment of lugs with a detent. Once the lugs advance past the detent, they are rotated so that a segment of the shaft on the male end of the connection can no longer turn. Further rotational movements by the ROV on another portion of the shaft advances a plate which makes up the connection, either for the umbilical or the flowline.