Patent RU-2367788-C1 (RU)
Title: Gas-condensate well pad
Inventor: LACHUGIN IVAN GEORGIEVICH
IPC: E21B43/12
Filed: 2008-05-20
Granted: 2009-09-20
Abstract: FIELD: oil-and-gas production. 
     SUBSTANCE: invention relates to exploitation of gas-condensate fields and can be used for remote, automatic and manual control of actuating mechanisms of shutting-off devices of wells, which are part of a gas-condensate well pad. The well pad comprises at least two gas-condensate wells, each of which contains a production casing with a flow column with underground production equipment, containing at least a remote controlled safety valve with an actuating mechanism, wellhead with wellhead equipment, with a casing head and a tubing head on which is mounted an X-mas tree with shutting-off devices - casing and wing valves with actuating mechanisms, as well as a throttle valve adjacent to the latter with an actuating mechanism, and monitoring and control devices - a fuse link and a low- and high-pressure control valve. Each well is connected to a control station through its shutting-off devices, throttle valve and safety valve, where the control station comprises a common pump-accumulator unit and at least one control unit for each well. The pump-accumulator unit comprises a group of pumps and a high-pressure power functional hydropneumatic accumulator, connected to it through actuating medium of a high-pressure line. Each control unit comprises power lines for functional control of actuating mechanisms of shutting-off devices, throttle valve, safety valve for each well, supplied by the said high-pressure line, through pressure regulators, and can control their operation through a time-stepped system for delaying command transmission for at least shutting off each well in the logical sequence: "wing valve - casing valve - safety valve" - logical control line, linked to the fuse link and the low- and high-pressure control valve and fitted with hydraulic distribution valves, with possibility of backing up command transmission for shutting off each well. One of these valves can transmit a well shut-off command to the logical control line from the fuse link, the other - from the low- and high-pressure control valve, and at least two others - from remote and manual control respectively. The said delay system comprises delay mechanisms, fitted on sections for interaction of the logical control line with power lines for functional control of actuating mechanisms of the casing valve and safety valve. The delay mechanisms comprise a control hydropneumatic accumulator and a throttle, which provide for shutting off each well at different times. The power line for functional control of the actuating mechanism of the safety valve of each well is provided with at least one pressure booster, which interacts with a reducing pressure regulator, which provides for values which, when multiplied with the transmission ratio of the booster, provide for operating pressure at the output, required for operation of the actuating mechanism of the safety valve. 
     EFFECT: more reliable and accident-free operation of a well, which is part of a gas-condensate well pad and much easier control of processes. 
     17 cl, 3 dwg, 1 ex