RU59750U1 - COMPLEX OF EQUIPMENT FOR DISPOSAL OF ASSOCIATED GAS AND INCREASE OF OIL TRANSFER OF LAYERS - Google Patents

Abstract

The utility model relates to the field of oil recovery and, in particular, is a set of equipment for utilization of associated gas and enhanced oil recovery.

The complex of equipment for associated gas utilization and enhanced oil recovery includes a first stage gas compression unit, a compression booster unit and a high-pressure pump unit.

A characteristic feature of the complex is that the installation of the first stage of gas compression includes a multiphase screw pump-compressor and a pump for supplying the process fluid. At the pump-compressor output, a two-phase separator is installed, the liquid output of which is connected to a steam trap. The booster compressor unit is based on a compressor with a water trap, the suction gas manifold of which is connected to the gas outlet of the specified separator. The discharge manifolds of the booster compressor and the high-pressure pump unit are connected through a mixing device, which, in turn, is connected to the well.

The installation of the first stage of gas compression is equipped with a gas flow meter, process water flow meters supplied to the screw pump-compressor and water separated by a separator. The booster compressor unit is equipped with a liquid flow meter supplied to the formation and maintenance of a water seal. The drives of a screw pump-compressor, a compressor with a water lock, a feed pump and a high-pressure pump unit are adjustable. The complex is equipped with a monitoring and control system that ensures the maintenance of the required water-gas ratio of the gas-liquid mixture injected into the well. Electrically operated valves are installed on the suction gas pipeline of the booster unit and the suction pipelines of the high-pressure pump unit and the feed pump, and non-return valves are installed on the discharge pipelines of the booster compressor unit and the high-pressure pump unit. The injection pipeline from the booster compressor unit to the well is equipped with an electric heating device, and the booster unit is equipped with a bypass pipeline. Installation of the first stage of gas compression can be performed on the basis of a jet-liquid compressor of 5 p.p. 1 cl.

Description

The inventive utility model relates to the field of oil recovery and, in particular, is a set of equipment for the utilization of associated gas and increase oil recovery.

Numerous designs of pump-compressors are known for pumping gas-liquid mixtures and gases, which have found their application in well development, implementing technologies for enhancing oil recovery using low-pressure gas, for pumping multiphase media through a single pipeline, etc. (see, for example, A.S. USSR No. 714044, class F 04 B 23/10, 1976; RF patent No. 2145677, class F 04 B 23/06, 1998; St. RF for utility model No. 22204, CL F 04 B 19/16, 2001; RF patent for utility model No. 36708, CL F 04 B 19/06, 23/10, etc.).

For the prototype of the claimed utility model can be taken installation for pumping a gas-liquid mixture according to US Pat. RF for utility model No. 36708, class. F 04 B 19/06, 23/10, publ. 03/20/2004 in BI No. 8.

In accordance with this technical solution, the installation for water-gas treatment of the formation includes a pump-compressor unit with a reciprocating blower, a compression chamber, a feed pump with a drive and a separator unit. It is equipped with an automatic control system. When a gas or gas-liquid mixture is supplied, the installation is a booster (that is, it increases the pressure of the gas or gas-liquid mixture before supplying it to the consumer to the required value - above 40-50 MPa).

The disadvantage of the installation of the prototype is that for its effective application, the necessary pressure of the gas supplied to the inlet must be tens of atmospheres to achieve the final pressure of 200-400 MPa, required by modern technologies for increasing oil recovery, which does not allow the use of associated gas, pressure which is 1-3 atm.

In connection with the stated main technical problem, the claimed utility model is aimed at solving, it is the creation of such a complex of equipment for increasing oil recovery, which would allow the use of associated gas of low pressure, as well as provide a wide range of regulation of the water-gas ratio in GHS injected into the well.

To solve the technical problem, a set of equipment for associated gas utilization and enhanced oil recovery includes a first stage gas compression unit, a booster compressor unit and a high-pressure pump unit. A characteristic feature of the complex is that the installation of the first stage of compression includes a multiphase screw pump-compressor and a pump for supplying the process fluid. At the pump-compressor output, a two-phase separator is installed, the liquid output of which is connected to a steam trap.

The booster compressor unit is based on a compressor with a water seal. The suction gas manifold of the booster compressor unit is connected to the gas outlet of the separator of the installation of the first compression stage. The discharge manifolds of the booster compressor and the high-pressure pump unit are connected through a mixing device connected to the well. The installation of the first stage of gas compression is equipped with a gas flow meter and flow meters of process water supplied to the screw pump-compressor, and water separated by a separator. The booster compressor unit is equipped with a liquid flow meter supplied to the formation and maintenance of a water seal. The drives of a screw pump-compressor, a compressor with a water lock, a feed pump and a high-pressure pump unit are adjustable. The complex is equipped with a monitoring and control system that maintains the required water-gas ratio of the gas-liquid mixture injected into the well by regulating the performance of the high-pressure pump unit based on the analysis of gas and liquid flow meters. Electrically controlled valves are installed on the suction pipe of the gas of the first stage of compression, the suction pipe of the gas of the booster unit, the suction pipes of the high-pressure pump unit and the feed pump, and non-return valves are installed on the discharge pipelines of the booster compressor unit and high-pressure pump unit. The discharge pipeline from the booster compressor unit to the well is equipped with an electric heating device, and the booster compressor unit is equipped with a bypass pipeline. Alternatively, the installation of the first degree of gas compression can be performed on the basis of a jet-liquid compressor of known design.

The feasibility of the claimed utility model is proved by the use of equipment for domestic and foreign practice.

injection of gas and gas-liquid mixtures using volume displacement pumps. In particular, the above analogues and prototype are implemented in a number of domestic installations.

Technical features that are distinctive for the claimed utility model can be implemented using tools used in various fields of technology, including in oil and gas production.

Distinctive features reflected in the formula of the utility model are necessary and sufficient for its implementation, as they provide a solution to the problem - utilization of associated gas and its use to increase oil recovery.

In the future, the claimed utility model and compressor operation is illustrated by an example of its implementation, schematically shown in the attached drawing, which shows a diagram of the inventive complex of equipment for utilization of associated gas and enhanced oil recovery.

The inventive complex includes the installation of the first stage of compression of low-pressure field gas 1 (see Fig.), Made, for example, on the basis of a multiphase screw pump-compressor 2. To ensure the operation of the pump-compressor, water is pumped into it by pump 3. The flow rate of which is measured by a flowmeter 4 . An electrically controlled valve is installed on the suction gas manifold of the pump-compressor 5. Gas flow rate is measured by a flow meter 6. At the outlet of the pump-compressor, a separator 7 is installed to separate the process water, while the course of the separated water is measured by the flow meter 8. To prevent breakthrough through the liquid outlet of the separator 9 of free gas, a condensate drain 10 is installed on it.

Gas after the 1st stage of compression is fed to the input of a booster unit 11 based on a compressor with a water lock 12, on the inlet gas pipeline of which an electrically controlled valve 13 is installed.

To create and maintain a water trap in the compressor, the booster unit includes a feed pump 14, the flow of feed water is controlled by a flow meter 15. A check valve 17 is installed on the outlet pipe of the gas-liquid mixture 16.

To ensure the required increase in oil recovery ratio of the water-gas ratio of the gas-liquid mixture injected into the well, the complex includes a high-pressure pump unit 18, including a plunger pump 19, on the intake manifold of which an electrically controlled valve 20 is installed, while the water flow is controlled by a flow meter 21. On the discharge a non-return valve 22 is installed in the pipeline of the high-pressure pump. The productivity of the pump installation is determined from the ratio:

where

HCV - the required water-gas ratio of the gas-liquid mixture according to the conditions of the technology;

Q _n - the regulated value of the performance of the high pressure pump;

Q _z.I , Q _s.I - respectively, the water flow rate for ensuring the operation of the screw pump compressor and the water flow rate separated by the separator of the 1st stage of gas compression;

Q _{g. II} - water consumption for the formation and maintenance of a water seal;

Q _g - gas productivity under suction conditions in stage I of compression;

K _I , K _II - respectively, the degree of compression of the I stage of gas compression and booster compressor with a water seal.

The gas-liquid mixture from the booster compressor unit 11 and the water from the high-pressure pump unit 18 are mixed in the mixing device 23 and sent to the injection well 24.

To prevent hydrate formation, the injection pipeline of the gas-liquid mixture from the installation 11 to the well 24 is heated using an electric heating device 25.

The control and management of the equipment complex is carried out by the control system 26, which ensures the coordinated operation of the plants and equipment protection. The booster compressor unit is equipped with a bypass pipe 27, which is necessary for independent start-up and entry to mode 1 of the compression stage.

The electric drives of the pump-compressor 2, the compressor with a water trap 12, the feed pump 14 and the high-pressure pump 18 are frequency-regulated (in the FIG. Conditionally designated REP) to provide the required operating modes of the complex and vary the parameters of the injected well into the well.

An embodiment of the complex provides for the installation of the first stage of gas compression based on a jet-liquid compressor. See, for example, the work of Eliseev V.N. "Development and research of a liquid-jet compressor unit with an adjustable drive" an abstract of the competition for the degree of candidate of technical sciences Gubkin Russian State University of 1996

The choice of a design version of the installation of the first stage of compression based on a multiphase screw compressor is carried out according to the criterion of minimizing capital costs for the implementation of associated gas utilization technology to increase oil recovery.

Claims (5)

1. A set of equipment for the utilization of associated gas and enhanced oil recovery, comprising a first stage gas compression unit, a compression compressor unit, a high pressure pump unit, characterized in that the first stage gas compression unit includes a multiphase screw pump-compressor and a process fluid supply pump, at the same time, a two-phase separator is installed at the output of the compressor pump, with the liquid output of the separator connected to a steam trap, and a compressing booster The installation is based on a compressor with a water trap, the suction gas manifold of which is connected to the gas outlet of the separator of the first stage of compression, in addition, the discharge manifolds of the booster compressor and pump unit are connected through a mixing device, which in turn is connected to the well. 2. The complex according to claim 1, characterized in that the installation of the first stage of gas compression is equipped with a gas flow meter, flow meters of process water supplied to the screw pump-compressor, and water separated by a separator, and the booster compressor unit is a flow meter of liquid supplied to the formation and maintaining a water lock. 3. The complex according to claim 1, characterized in that the drives of the screw pump-compressor, compressor with a water seal, a feed pump and a high-pressure pump unit are made adjustable, and the complex is equipped with a monitoring and control system that maintains the required water-gas ratio of the gas-liquid mixture ( GGS) injected into the well by regulating the performance of the high-pressure pump unit based on an analysis of the readings of gas and liquid flow meters, while High pressure tubes are determined from the formula:

where HCV is the required water-gas ratio of GHS according to the conditions of the technology; Q _n - the regulated value of the performance of the high pressure pump; Q _z.I , Q _s.I - respectively, the water flow to ensure the operation of the screw pump-compressor and the water flow separated by a separator of the 1st stage of gas compression; Q _{g. II} - water consumption for the formation and maintenance of a water seal; Q _g. - gas productivity under suction conditions in stage I of compression; K _I and K _II - respectively, the compression ratio of the 1st stage of gas compression and the waiting compressor with a water seal. 4. The complex according to claim 1, characterized in that electrically operated valves are installed on the suction pipe of the first stage gas, the suction pipe of the gas of the booster unit and the suction pipelines of the high-pressure pump unit and the feed pump, and the booster compressor unit and high-pressure pump unit are installed on the discharge pipelines check valves are installed, in addition, the discharge pipe from the booster compressor unit to the well is equipped with an electric heating device, booster compressor installation is equipped with a bypass line. 5. An embodiment of the complex according to claim 1, characterized in that the installation of the first stage of gas compression is made on the basis of a jet-liquid compressor.