Wells – Processes – Placing or shifting well part
Patent
1991-04-23
1992-11-17
Dang, Hoang C.
Wells
Processes
Placing or shifting well part
166 50, 166116, 166153, 166156, 166322, E21B 2308
Patent
active
051635151
ABSTRACT:
Pumpdown toolstring for performing operations requiring application of power downhole in horizontal or high-deviation oil or gas wells, comprising an elongate toolstring element (30), locomotive devices (31, 32A) on said toolstring element, with at least one locomotive device (32) provided at a trailing or top end of the toolstring element (30). The toolstring element (30) is tubular and has a closed leading or bottom end, whereas it is open at the opposite, top end. The leading locomotive device, (31) adapted to pull the toolstring element during pumping down, has a seal for co-operation with a seat at a no-go or nipple assembly at the bottom end of a tubing from which an extension tubing extend into the horizontal or high-deviation well. The leading locomotive device (31) sealingly surrounds the toolstring element (30) and allows sliding of the toolstring element there-through when engaging the seat. The toolstring element (30) has a safety bypass valve (80) near the at least one locomotive device (32A) at the top end of the toolstring element and check valve (70) between the bypass valve (80) and the at least one locomotive device (32A).
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S. Hovland et al., "Planning, Implementation, and Analysis of the First Troll Horizontal Well Test", pp. 197-207, SPE 20963, 1980.
Churchman Ronald K.
Clemens Jack G.
Kilgore Marion D.
Pearce Joseph L.
Tailby Roger
Dang Hoang C.
Den Norske Stats Oljeselskap A.S
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