FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil industry and can be used for rapid disconnection of well shaft during repair and preventive works in well. Packer includes a shaft with cushioning on it elastic collar element lowered into a casing string. This element is made with an air inflatable cavity. It is fixed on the shaft with the help of upper and lower stops covering ends of the sealing element. Above upper stop concentrically arranged on barrel housing is installed. Housing is fixed by split ring from shift upwards. There is a filter forming a cavity with the housing for pure hydraulic fluid supplied through the filter from above-packer space of the well. In housing there installed is electrically driven pump for injection of pure hydraulic liquid into hydraulically inflated cavity through radial channel equipped with check valve, and a longitudinal channel provided with a check valve through a cavity made in the housing, with a sensor for measuring pressure in the pressurizing cavity. There is a controlled discharge valve for releasing excess fluid pressure from the hydraulically inflated cavity through the second longitudinal and radial channels. On top of the filter there is a measuring module with a liquid pressure sensor in the above-packer space. Under the lower stop there installed is the second housing fixed by the collar on the shaft from the downward displacement, equipped with the second measuring module with the liquid pressure sensor in the below-packer space of the well. In this space there is a second controlled drain valve for releasing excess fluid pressure from the hydraulic inflatable cavity into the sub-packer space through the longitudinal channel made at the bottom of the sealing element and in the lower support, and a radial channel communicating the drain valve with the pressurized cavity. Longitudinal channels are additionally equipped with branch pipes tightly connecting the sealing element with stops. Electric drives of the pump and controlled discharge valves and measuring modules are connected to the control station of electric cable, for its conducting on the shaft there is a longitudinal groove. Pump and bleed valves can also be equipped with individual power supplies and with measuring modules are connected to control station of telemetry system.
EFFECT: improved operational characteristics and possibility of multiple use of packer.
1 cl, 2 dwg
