초록 ▼

A well surging system having pressure actuated ball valves and a mechanical actuating backup for the upper of said ball valves. The apparatus comprises a valve assembly portion containing the upper and lower ball valves which may be independently pressure actuated. The valve assembly portion also in

A well surging system having pressure actuated ball valves and a mechanical actuating backup for the upper of said ball valves. The apparatus comprises a valve assembly portion containing the upper and lower ball valves which may be independently pressure actuated. The valve assembly portion also includes an extension portion having an extension mandrel therein connected to an upper ball valve actuator. The lower ball valve is opened by increasing the pressure in the well annulus around the valve assembly portion with respect to a flow bore therethrough. The upper ball valve is similarly pressure actuated. In the event that the upper ball valve pressure actuation is fully or partially unsuccessful, a probe assembly portion may be lowered on a wireline into the extension portion adjacent to the valve assembly portion. The probe assembly portion is adapted for releasable engagement with a lug extending inwardly from the extension mandrel. When the probe assembly portion is engaged with the lug, the extension mandrel and the upper ball valve actuator may be lifted by raising the wireline. After this mechanical backup actuation, the probe assembly portion is released from the lug and removed from the tool string.

대표청구항 ▼

A well surging apparatus comprising: a valve assembly portion defining a central flow bore therethrough and comprising a ball valve disposed across said flow path; pressure operating means for actuating said ball valve in response to a pressure differential between said flow bore and a well annulus

A well surging apparatus comprising: a valve assembly portion defining a central flow bore therethrough and comprising a ball valve disposed across said flow path; pressure operating means for actuating said ball valve in response to a pressure differential between said flow bore and a well annulus around said valve assembly portion; and mechanical operating means for mechanically actuating said ball valve and comprising a portion separable from, and positionable adjacent to, said valve assembly portion. A method of surging a well comprising the steps of: positioning, at a predetermined position in a well bore of said well, a tool string comprising upper and lower spaced ball valves and a packer; initially orienting said ball valves in a closed position such that a surge chamber is defined therebetween; setting said packer into sealing engagement with said well bore at a position above a zone to be surged; after setting said packer, opening said lower ball valve such that fluid is surged from said well zone into said tool string past said open lower ball valve and into said surge chamber; and selectively opening said upper ball valve by at least one of pressure actuated and mechanical actuated ball valve operating means, wherein said step of opening said upper ball valve is initially attempted by using said pressure actuated ball valve operating means and comprises subsequently using said mechanical actuated ball valve operating means if opening said upper ball valve is not accomplished by pressure actuation.