SU1177457A1 - Apparatus for operating a well - Google Patents

Description

The invention relates to the oil industry, namely, devices for extracting oil from wells.

A device for the operation of wells, containing a pump and a packer p], is known.

This device does not achieve an increase in the flow of oil due to the inability to create a depression at ^{, 0} periodic operation during the shutdown of the pump without complicating the wellhead equipment.

The closest technical solution to the invention is a device for operating a well, containing a tubing string, a pump and a packer with a drain check valve for communication of the annular and sub-packer 70 spaces of the well [2].

A disadvantage of the known device is the absence of an increase in the oil flow due to the impossibility of creating a depression on the reservoir during periodic operation when the pump is turned off without complicating the wellhead equipment.

The aim of the invention is to increase oil production by creating 30 on the reservoir of depression during periodic operation during shutdown of the pump.

This goal is achieved by the fact that in the device for operation of 35 wells, containing a NO column with a pump and a packer with a drain check valve for communicating the annular with the subpacker spaces of the wells, the packer is located above the pump intake and 40 is equipped with a unit for bypassing gas from the substacker into the annulus , made in the form of a check valve, and a nozzle located above it, rigidly connected to the 45 packer, and the response pressure of the drain check valve is less than the pressure of the liquid column equal to the height _o pipe.

FIG. 1 shows a device for 50 well operation, a longitudinal section; in fig. 2 - a device for the operation of a well when using an electric centrifugal pump (ECI), longitudinal section; in fig. 3 — graphs of the change in time of the gas pressure P and vacuum P ₂ (mm Hg) in the sub-packer space, liquid level with a linear filtration law (kg / h).

The device for operating the well (Fig. 1) contains a sucker-rod pump 2 mounted on the column NO 1, a packer 3 with a drain check valve 4 for communicating the annular 5 with the podpakerny 6 spaces of the well, and a unit for bypassing gas from the podpakerny to the annulus well a check valve 7 and a nozzle 8 located above it with holes 9. The device for operating the well is characterized by the presence of ESP 10, which replaces the sucker-rod pump 2. Package 3 is installed above the maximum dynamic level of the liquid 11.

The device works as follows.

When you turn on the pump (sucker-rod 2 or ESP 10) initially high level of liquid begins to decrease, the pressure of the gas contained between the packer 3 and the surface of the liquid begins to decrease. This causes the closing of the check valve 7, which prevents the flow of gas from the 6th sub-packer 6 well space into the annular 5. After the liquid level has decreased to the pumping unit, the latter is turned off. The gas pressure in the subpacker space 6 is below atmospheric and is determined by the ratio of the initial gas volume under the packer and the volume of the pumped liquid.

A decrease in gas pressure increases the depression in the reservoir, which causes an increase in the flow of oil. As oil accumulates, the liquid level rises, compressing the gas under the packer, and at the end of the accumulation period, the pressure rises to atmospheric. During accumulation, a small amount of gas is gradually released from the liquid (due to the fact that gas content in oil is usually insignificant in low-yield wells). Therefore, the amount of gas under the packer 3 at the end of accumulation may slightly exceed the amount of gas at the time of the beginning of the previous pumping. After equalizing the gas pressure with atmospheric pressure, a check valve opens, through which, with a further rise in the liquid level, the excess gas at atmospheric pressure is forced out into the annular 5

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space communicated with the atmosphere (horizontal section on the pressure graph, Lig. 3). After reaching the maximum level of the liquid 11, the pump is switched on again, and the indicated processes are repeated.

Due to the presence of leaks in the tubing string 1, liquid may accumulate on the packer. When you exceed the level that causes the operation of the drain check valve 4, the latter opens, and the liquid accumulated above the packer 3 flows into the sub-packer space 6, from which it is subsequently pumped out by the pump. The nozzle 8 with holes 9 prevents the ingress packer, into the check valve 7, that

performed subject to: pressure

actuation of the drain check valve 4 is less than the pressure of the liquid column, equal to the height of the nozzle 8.

This ensures reliable operation of the check valve 7 and the maintenance of vacuum in the sub-packer space 6. The drain check valve U 4 can be made spring-loaded or float-operated.

Thus, the device for the operation of the well allows us to treat an increase in oil flow at 15 periodic operation during the pump shutdown, without complicating

FIG. one

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Claims (2)

A DEVICE FOR OPERATING A WELL, containing a tubing string with a pump and a packer with a drain check valve for communicating the annulus to the under-packer well space, characterized in that, in order to increase oil production by creating a depression on the formation during periodic operation during pump shutdown, the packer is located above the pump intake and is equipped with a unit for bypassing gas from the sub-packer into the annular space of the well, made in the form of a check valve, and a port located above it, associated with the packer, and the response pressure of the drain check valve is less than the pressure _ of the liquid column equal to the height <d nozzle. l 1177457 2