SU969890A1 - Method of operating oil and gas wells - Google Patents

Description

The invention relates to the oil and gas industry and can be used to increase the efficiency of operation of fountain wells.

There is a method of operating a well using the energy of gas accumulating in the annulus, with automatic control of gas extraction (1].

The disadvantage of this method are significant changes in time of gas pressure at the wellhead.

1S The closest in technical essence and the achieved result to the proposed one is the method of operating gas and gas condensate wells in the annulus and fountain column with the restriction of gas extraction from the annulus by throttling and maintaining a constant differential pressure in the fountain column and annulus [2]. 25

The disadvantage of this method is the inability to create pressure to ensure uncompressed transport of gas taken from the annulus. thirty

The purpose of the invention is the creation of pressure to ensure uncompressed transport of gas taken from the annulus.

This goal is achieved by the fact that according to the method, liquid from the annulus is passed into the column of fountain pipes through a check valve located on the column of fountain pipes, the check valve in oil wells is set below the boundary of paraffin deposits.

The drawing schematically shows a well for implementing the method, a section. A well operating simultaneously along the column of fountain pipes and the annular space contains two pipe columns: one production 1 and another fountain 2, located in the first. A check valve 3 is installed below the mouth in the side wall of the fountain pipe string, through which the liquid entering the annulus from the formation 4 is passed into the lifting column 2. At the wellhead, a differential pressure sensor 5 is installed, which compares the pressures in front of the control valve 6 and in front of the nozzle '7. The output signal of the sensor 5 is supplied to the control unit 8, from which the control action is transmitted through the control unit 9 to the control valve 6. Gas from the pipe end through the control valve 6 enters the gas pipeline 10 ,. and the gas-liquid mixture, 1 having passed through the fitting 7, enters the pipeline 11.

The method is as follows.

The gas-liquid mixture from the reservoir 4 enters the well under the influence of the difference between the bottomhole and reservoir pressure. Further, the gas-liquid mixture 15 rises along the column of the fountain pipes and the annular space under the influence of the difference between the bottomhole pressure and the pressure in the column of the fountain pipes and the annular space 20 at the installation level of valve 3. The pressure at the installation level of the non-return valve 3 in the annular space is equal to or greater than the pressure in the column fountain pipes at the same level. From the gas-liquid mixture flowing through the annulus, gas is released which is introduced from the annulus through the control valve 6 into the gas pipeline 10. The pressure at the mouth of the annulus by the control valve 6 is maintained higher than the pressure in the flow pipes in front of the nozzle 7. The differential pressure is maintained by a constant sensor 5 differential pressure, whose signals through the control unit 8 are transmitted to the control unit 9, which controls the operation of the control valve 6.

The excess pressure at the mouth of the annular space compared with the pressure at the mouth of the column of fountain pipes is a condition sufficient to prevent the removal of fluid from the annular space. A necessary condition for the extraction of gas from the annulus is the transfer of the liquid phase from the annulus to the column of fountain pipes, which is produced through the check valve 3. The amount of gas discharged from the annulus depends on the installation depth of valve 3 on the column of fountain pipes 2 and on gas pressure in front of control valve 6. With decreasing installation depth of check valve 3 and pressure in front of valve 6, the amount of gas admitted from the annulus increases.

Separate production of free gas through the inter-river space and gas-liquid mixture through the column of fountain • pipes by the proposed method allows to reduce the cost of gas compression sent to consumers.

Claims (2)

rum7. The output signal of the sensor 5 is fed to the regulating unit 8, from which the regulating influence is transmitted through the control unit 9 to the regulating valve 6. The gas from the annular space through the regulating valve 6 enters the gas pipeline 10 ,. and the gas-liquid mixture, 1 pass fitting 7, enters pipe line 11. The process is carried out as follows. The gas-liquid mixture from reservoir 4 enters the well under the action of the difference of bottomhole and reservoir pressure. Next, the gas-liquid mixture rises along the column of flow-well pipes and annulus due to the effect of the differential pressure and pressure in the column of flow-holes and between the dental space at the valve 3 installation level. The pressure at the installation level. pipes at the same level From the gas-liquid mixture flowing through the annular space, gas is released, which is injected from the annular space through the regulating valve 6 into the gas pipe o 10. The annulus pressure at the annulus of the regulating valve b is maintained higher than the pressure in the flow pipes before fitting 7. The pressure differential is maintained by a constant differential pressure sensor 5, the signals of which are transmitted through the regulating unit 8 to the control unit 9 valve 6. The overpressure at the wellhead between the tube space compared with the pressure at the wellhead of the fountain pipe column is a condition sufficient to prevent the liquid from escaping from the annular pipe. rastranstva. A necessary condition for the extraction of gas and annular space is to bypass the liquid phase from the annular space into the column of fountain pipes, which is produced through a check valve 3. The amount of gas released from the annular space depends on the depth of installation of valve 3 on the column of fountain pipes 2 and on the magnitude of the gas pressure upstream of the regulating valve 6. With a decrease in the depth of installation of the check valve 3 and the pressure upstream of the valve 6 and the amount of gas inlet from the annular space increases. Separate extraction of free gas through inter-ruble space and gas-liquid mixture through a column of flow pipes using the proposed method allows to reduce the cost of compression of gas directed by consumers. Claim 1. Method of operating oil and gas wells at the same time in the annular space and the column of fountain pipes with the restriction of gas extraction from the mechstructive space and maintaining in the column of fountain pipes and the annular space a constant pressure differential, 6 t of which is creating pressure to provide an uncompressed transport of gas withdrawn from the annular space, the liquid from the annular space is transferred to the column of the flow pipe through a check valve, placing nny on a column of flowing pipes. 2. Method POP1, characterized in that the non-return valve in oil squashines is set below the paraffin deposit limit. Sources of information taken into account in the examination 1. The author's certificate of the USSR 591582, cl. E 21 B 43/00, 1978. 2. USSR author's certificate number 345266, cl. E 21 B 43/00, 1972 (prbtotip). . - about- about .about ° nd -about -about -  uh E P