FIELD: oil industry.
SUBSTANCE: invention relates to the oil industry and can be used to reduce the bottomhole pressure on the formation or to raise the dynamic level above the pump intake in wells with a low dynamic level, to remove the excess gas pressure in the annulus of an oil well during operation by electro-centrifugal, electro-screw, electro-diaphragm and sucker rod pumps by extraction of gas from the annular space of a marginal well using a jet pump, the working flow of which is a liquid lifted by electro-centrifugal, electro-screw and electro-diaphragm pumps of a high-rate well, along bypass lines and pumping it into a discharge manifold. The invention provides an increase in the efficiency of the formation fluid production technology in marginal wells with a large gas ratio and, in the event of equipment breakdown, does not affect the operation of a high-rate well due to prompt switching to the normal mode. The essence of the invention lies in the fact that when using the method of reducing the gas pressure in the annulus of marginal wells, in the wells of one cluster, equipped with electric centrifugal, electro-screw, electro-diaphragm and sucker rod pumps, through an additional tee and a gate valve installed between the central and buffer valves of the wellhead shut-off valves of the high-rate well, a bypass line for supplying well fluid is laid, parallel to the well fluid extraction line, on which a jet pump is installed, the vacuum chamber of which is connected to the annulus of a marginal well, equipped, among other things, with a sucker rod pump, a separate line containing a back pressure valve. The outlet of the jet pump in front of the linear valve is connected to the well fluid extraction line through a back pressure valve. In using this method, the working flow of the jet pump is a liquid lifted by electric centrifugal, electric screw and electric diaphragm pumps of a high-rate well. The operation of the jet pump is controlled by changing the pressure at its inlet by adjusting the flow area in the choke chamber, or an angle valve embedded in the well fluid extraction line, or by changing the rotational speed of a submersible electric motor of a high-rate well, or by selecting the number of sections of electric centrifugal, electric screw and electric diaphragm pumps of a high-rate well to create the required pressure. In this case, the excess gas pressure in the annular space of a marginal well is reduced by taking gas from the annular space of an oil well and pumping it into the well fluid extraction line. Emergency solenoid valves are installed on both inlet lines of the jet pump, and a sampler for supplying methanol is installed in the bypass line for supplying the pumped liquid in order to eliminate hydrate blockages. The pressure in the lines is monitored by pressure gauges. An automatic level gauge is installed to control the level in the annulus of a marginal well. The data from the sensors are sent to the control station to monitor and automatically control the operation of the equipment and emergency solenoid valves.
EFFECT: invention provides an increase in the efficiency of the formation fluid production technology in marginal wells with a large gas ratio and, in the event of equipment breakdown, does not affect the operation of a high-rate well due to prompt switching to the normal mode.
1 cl, 1 dwg
