Patent GB-584410-A (GB)
Title: Improvements in and relating to the raising of natural oil and other liquids by gaseous pressure
IPC: E21B34/06
Filed: 1944-10-26
Abstract: 584,410. Raising liquids by gaseous pressure. BROWN, N. F., and INDO-BURMA PETROLEUM CO., Ltd. Oct. 26, 1944, No. 20823. [Class 102 (ii)] [Also in Group XXIX] In an arrangement for raising oil in a bore hole by gaseous pressure, a portion of the oil is raised by the gas and then separated and the gas above a predetermined pressure is returned to a stage of equivalent pressure in the gas compressor; gas at suitable pressures may be returned to several appropriate stages. The oil is raised through the pipe 46 connected by a tapered portion to the pipe 48 that has piston portions 51-56 that co-operate with cylinders 9, 12, 13, 30, 26, 28 to control the admission and exhaust of gas under pressure. With the pistons 51-56 in the positions shown in Fig. 2, oil flows through the screen 35, passage 34, cylinder 26 and annular space 38 to fill the chamber 14. Gas above the oil can be exhausted through the cylinder 13, passage 19, sleeve 68, ports 68a and the bore 1 to the pipe 4. When the pistons 51-56 are lowered, the oil inlet from the screen 35 is isolated between the pistons 54, 55 and the oil in chamber 14 can flow through the apertures 57 in the lower end of the pipe 48 that will project from the cylinder 56. The gas exhaust passages 19 above the chamber 14 are isolated between the pistons 53, 54 and gas under pressure can flow from pipe 60 through pipe 3, cylinder 9, passages 16, annular space 17 to chamber 14 and displace and follow the oil up pipe 48 until the pistons 51-56 are again raised. The pipe 46 has a collar 45 that rests on a hollow rod 43 attached to a piston 52 raised by hydraulic pressure; the pipe 46 is lowered by gravity when the hydraulic pressure is released. Pressure is applied to the liquid by a piston 67 subjected to the gas pressure in the pipe 60 by the operation of a valve 64 by a remote timing device 65; the pressure is released by opening the valve 64 to exhaust. The oil and gas under pressure pass from the pipe 46 to a separator 59 and when the oil-level is raised sufficiently, a float 69 actuates a valve 72 to admit gas under pressure from the pipe 60 to the diaphragm 105, Fig. 4, to open the valve 97; 98 to allow the gas under pressure in the separator 59 to forcethe oil through pipe 77, valve 97, 98, spring-loaded valve 79, pipes 81 and 82 to the storage tank 83. When the oil level falls, the float 69 actuates the valve 72 and the diaphragm 105 is raised by the spring 107 to close the valve 97, 98 and open the valve 102, 103 to permit gas under pressure in the separator 59 to flow through the pipe 85, valve 102, 103, spring-loaded valve 87, pipes 88, 109, spring-loaded valve 87, pipes, 109 to the outlet of the first stage A of the compressor. When the pressure of the gas falls below a predetermined value, the valve 87 closes and the valve 93 is opened by the spring 94 to permit the remainder of the gas to flow through pipe 91 to pipe 4 that receives the exhaust from the bore. The pipe 4 is connected by the pipes 5 and 115 to the inlet of the first stage A of the compressor. The delivery of the first stage of the compressor passes through a separator 111 to the second stage B that supplies the pipe 60. Specification 493,283 is referred to.