WELL SAFETY SYSTEM,申请号CA19800345112-传众专利搜索

WELL SAFETY SYSTEM

申请公布号：CA1129338(A)

申请号：CA19800345112

申请日期：1980.02.05

申请公布日期：1982.08.10

申请人：

OTIS ENGINEERING CORPORATION

发明人：CALHOUN, MICHAEL B.;BAYH, RUSSELL I., III;DUTTON, ROBERT E.

分类号：E21B23/00;E21B34/00;E21B34/10;(IPC1-7):21B43/12

主分类号：E21B23/00

摘要：<p>WELL SAFETY SYSTEM A well safety system for controlling the flow of fluid through well conduits. The system includes a surface controlled subsurface safety valve made up as part of a tubing string extending from the well surface to a subsurface formation within a casing string. A packer, installed below the safety valve, forms a fluid tight seal between the tubing and casing to direct fluid from below the packer into the tubing. The safety valve contains lateral passageways which allow communication of fluid from the bore of the safety valve to the annulus between the tubing and casing above the packer. A valve actuator is releasably secured within the upper portion of the safety valve and forms a fluid tight seal between control fluid pressure in the tubing string above the safety valve and formation fluid pressure in the tubing string below the safety valve. The safety valve can be locked open when control pressure is increased above a preselected value and then released. The safety valve can be unlocked by returning control pressure to another preselected value. The valve actuator allows liquids to be injected from the surface to below the safety valve to kill the well. The tubing and seals within the valve actuator can he pressure tested when the valve actuator is initially installed within the safety valve without opening the safety valve.</p>