Expandable tank for separating particulate material from drillin

Details Expandable tank for separating particulate material from drillin Expandable tank for separating particulate material from drillin

1998-03-09

2000-05-16

Bagnell, David

Wells

Submerged well

Means removably connected to permanent well structure

210170, E21B 712

Patent

active

060623136

ABSTRACT:
A system for separating particulate material from drilling fluid for underwater wells of the type which comprise an above-water drilling platform, a string of drill pipe extending from the platform to the subsea floor for drilling the well and an annulus extending into an earth formation beneath the subsea floor. The drill pipe runs through the annulus into the formation for drilling a well in the formation. Also included is a system for circulating a drilling fluid downwardly through the string of drill pipe and upwardly through the annulus for removing particulate material generated from drilling the well. The system further including a return conduit and pump for returning the drilling fluid to the water surface. The system comprises an expandable tank positioned on the subsea floor and connected between the annulus and the return conduit so that the drilling fluid flows through the tank. The tank is shaped and dimensioned to allow at least a substantial amount of particulate material to settle out of the drilling fluid as the fluid flows through the tank to the return conduit. The tank can also be used for separating particulate matter from drilling fluid for land wells; and as a storage tank for production wells, both subsea and on land.

REFERENCES:
patent: 2357565 (1944-09-01), Vietti et al.
patent: 3684038 (1972-08-01), Nelson
patent: 3817383 (1974-06-01), Michel et al.
patent: 4133761 (1979-01-01), Posgate
patent: 5232475 (1993-08-01), Jepson
Perry et al., Perry's Chemical Engineer's Handbook, fourth ed., McGraw-Hill Book Co., pp. 23-64, 1963.

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