| 摘要 |
<p>Otis 4-131 WELL TOOL A landing nipple having a port through the wall thereof which is controlled by a valve carried by a non-circular ring which ring may be moved toward circular position by introduction of a sleeve-like member into the bore through the ring to unseat the valve. This invention relates to landing nipples. Landing nipples are frequently provided with a port for permitting flow between the interior and the exterior of the nipple. In many instances it is desirable to be able to control flow through this port. In producing petroleum wells, ported nipples have been used in the past with the port controlled by valves using elastomeric material to provide seals. For instance, a sleeve may be shifted to open and close a port with elastomeric material between the sleeve and the nipple body. Landing nipples may be subjected to conditions in which elastomeric material is not suitable. In landing nipples for wells producing fluid of high acidic content the fluid attacks the elastomeric material and in time renders ineffective the ability of the elastomeric material to control flow through a port. It is an object of this invention to provide a landing nipple with a valved port controlling flow through the side wall of the nipple without using seals of elastomeric material. Another object is to provide a landing nipple having a valve controlled port for flow through the wall of the nipple in which all parts of the nipple are made of metallic material.</p> |
