RU36708U1 - UNIVERSAL PLANT FOR WATER-GAS INFLUENCE ON THE PLAST - Google Patents

Description

Universal installation for water-gas stimulation

The claimed model is related to the field of hydraulic volumetric displacement machines and, in particular, is a universal installation for supplying a liquid, gas-liquid mixture or gas for water-gas treatment of a product formation during operation of oil field wells.

When developing oil fields, the method of waterflooding through a network of injection wells is widely used to maintain production rates and increase oil recovery. At present, water flooding is a highly potential mastered method of increasing oil recovery (see, for example, M.L.Surguchev’s book “Secondary and tertiary methods of increasing oil recovery, M.,“ Nedra, 1985, pp. 37-116). Pumping stations based on centrifugal or plunger pumps are used to supply water to the reservoir.

In the Russian Federation, a number of mobile pumping units are used to pump process fluids into wells in order to implement a wide range of technologies to increase well productivity and increase oil recovery (their productivity varies from 2 to 50 l / s and pressure to 70 MPa). These units have recently been manufactured on the basis of multi-plunger pumps (for example, pump units of the UNB type, manufactured by RANKO and the ANT type, manufactured by K-omian $ 1

Whitley Ural). At present, its time is known and more sophisticated technologies for effective stimulation of the formation associated with Schklichnaya, alternating injection of gas (natural gas, carbon dioxide, nitrogen) and water or gas-liquid mixture (see, for example, report Skauge Ame, Stensen Jan

Age “Review of field practice of applying the technology of alternating injection of water and gas (ADAP). The report was presented at the 1st ° International Conference and Exhibition “Oil Recovery 2003, May 19-23, Moscow, Russia, Gubkin University. Judging by the results presented in the report, this technology is very effective and promising in relation to increasing oil recovery (increasing oil recovery by 5-10% or more). This method can be accomplished by alternating water injection with a pumping unit and air injection

MKI F 04V 19/06 F 04V 23/10

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compressor installation. However, it is more convenient to carry out such injections by pump-compressor units.

Numerous designs of pump-compressors are known for pumping gas-liquid mixtures and gases, which have found their application in well development, implementation of cluster gas lift technologies using low-pressure gas, and for pumping multiphase media through a single pipeline (see, for example, A.S.SSSR No. 714044, class R 04B23 / 10, 1976; RF patent 2145677, IPC 7F 04B23 / 06, 1998, St. RF for utility model No. 22204, IPC 7F 04B19 / 16, 2001 and

For the prototype of the claimed utility model can be taken

installation for pumping a gas-liquid mixture according to US Pat. RF №2151912, MKI 7F 04B23 / 06, 2000 This installation includes a volumetric displacement supercharger with a separate drive, a compression chamber in communication with the pump’s working cylinder, a feed pump, a reservoir for nutrient fluid, an outlet (for gas) and a discharge valve and a low pressure gas supply pipe to the compression chamber.

During the suction stroke, the gas-liquid mixture or low-pressure gas is introduced into the compression chamber into the area adjacent to the discharge valve, and at the same time, the working fluid is injected from the intake manifold with an overpressure equal to the pressure of the mixture or gas injected, the working fluid . When the pump completes the discharge cycle, the gas-liquid mixture or gas accumulated above the liquid under the discharge valve is displaced into the discharge manifold and then to the consumer.

An advantage of an existing pump-compressor installation is the possibility of pumping the same installation of liquid (water) - in this case, it works like a conventional pump installation - of gas or a gas-liquid mixture - in this case it is a booster (i.e. increasing gas pressure or gas-liquid mixture of low pressure before feeding it to the consumer up to 40MPa and above).

However, the prototype has a significant drawback. In accordance with the PZVG technology, a portion of water and gas is pumped into the well in turn. When a portion of gas is pumped by a pump-compressor of a known type, the latter contains a certain amount of water (up to 10% by volume according to the pump-compressor operating conditions), depending on the operating mode.

As noted in the above report, due to the presence of a certain amount of water in a portion of the injected gas, in some cases, hydrates formed in the formation vapor, which clogged the pores, etc. reduced the efficiency of the process.

The disadvantage of the prototype is the lack of a sufficient number of instrumentation at the pump-compressor installation, providing control of operating modes and emergency locks when they are violated.

In the process of implementing gas-water stimulation of the formation, it is very important to know and control the flow rate, pressure and temperature of the low pressure gas supplied to the compression chamber to comply with the injection mode, as well as these indicators must be known and controlled at the outlet of the installation before they are sent to the consumer (i.e. downhole). The correctness (and, consequently, the result) of maintaining a given injection mode depends on this. Therefore, it is also necessary to know the indicated parameters for the working fluid supplied by the feed pump. For the oil in the drive part of the pump compressor and the feed pump (to avoid overload and failure), it is necessary to know the temperature. To ensure explosion safety, it is also necessary to control the presence of hydrocarbons in the areas of the location of the pump compressor and the capacity for the working fluid.

In connection with the stated main technical problem, the claimed utility model is aimed at solving, it is the elimination of the above disadvantages and the creation of such a universal installation of water-gas exposure, the design of which would expand its technological capabilities by providing gas injection without the presence of the latter in liquid (water) . In addition, the installation must be equipped with the necessary number of measuring instruments for measuring and monitoring the pressure, temperature and flow rate of low-pressure gas, feed liquid and gas or gas-liquid mixture, oil in the drive part of these pumps to comply with the specified injection mode into the well and ensure long trouble-free operation for tens of thousands of hours.

To solve the technical problem, a universal installation for water-gas treatment of a formation contains a pump-compressor unit including a volume displacement supercharger (for example, a multi-plunger) with a separate drive. It also includes a compression chamber with an exhaust valve for gas or gas-liquid mixture supplied from an independent source, and a discharge valve. In addition, the installation includes a feed pump with a separate drive, in communication with the tank for the supply fluid and with the hydraulic part of the supercharger through the suction valve, and pipelines for supplying the supply fluid and low pressure gas to the pump-compressor unit. A characteristic feature of the installation is that it is equipped with a separator unit, including a media separator, in communication with the outlet pipe of the pump-compressor unit and with a liquid-containing soluble gas outlet pipe in series and with an adjustable choke.

communicated, in turn, with a separator for separating dissolved gas, which is connected by a separate pipeline with a pump for pumping liquid into the tank for the supply liquid.

The universal installation is equipped with an automatic control system, a comprehensive device for measuring pressure, flow rate and gas temperature, installed on the gas supply line to the compression chambers, pressure and temperature control sensors on the output pipelines of the feed pump and pump-compressor unit, a flow meter on the output pipeline of the feed pump, the flowmeter detachable liquid separator sensors control the temperature and oil pressure in the drive part of the feed pump and the volumetric pump I, as well as sensors monitor the presence of hydrocarbons, established on containers for liquid supply and pump-compressor unit.

The feasibility of the claimed utility model is proved by the use of equipment for injecting gas and gas-liquid mixtures using volume displacement pumps in domestic and foreign practice. 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 (the presence of a separator unit of the specified composition connected to the pump-compressor unit, the presence of control and measuring devices with flow, temperature and pressure sensors, as well as hydrocarbon presence sensors) 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, because provide a solution to the problem - expanding the technological capabilities of the pump-compressor unit (in particular, by using the indicated PZVG method) and increasing the safety of the installation.

In the future, the claimed utility model is illustrated by an example of its implementation, schematically depicted in the attached drawing, which shows a diagram of the inventive universal installation for water-gas stimulation.

A universal installation for water-gas stimulation of a formation includes a pump-compressor unit 1 (see Fig.) With an adjustable drive, a supply pump 2 also with a separate drive, a container for the supply liquid 3 and a separator unit 4 (medium separator) for separating the supply liquid from gas-liquid mixtures. The separator 4 is connected to a fluid outlet 5, which in turn is connected to an adjustable throttle 6. The latter is connected to a separator 7 for separating the dissolved gas from the feed liquid separated by the separator 4. Separator 7 separate pipe 8 with a pump built into it

for pumping liquid 9 is connected to a container for supplying liquid 3. To control the injection process, the installation is equipped with a complex device 10 for measuring the flow rate, pressure and temperature of gas or low-pressure gas-liquid mixture supplied to the compression chamber 11 of the pump-compressor 1 through a gas supply pipe 12 from an independent source (not shown in FIG.). The installation is also equipped with pressure sensors 13 and temperature 14 of the gas-liquid mixture at the outlet pipe 15 of the pump-compressor 1. In the separator unit 4, after an adjustable throttle, a flow meter 16 is separated by a liquid separator 4. In the discharge line 17 of the feed pump 2, pressure sensors 18 and temperature 19 are installed, as well as a flow meter 20 of the feed fluid supplied by the pump 2. Capacity 3 is equipped with liquid level sensors 21. In the low pressure gas supply line 12, a valve 22 is installed to cut off the gas supply, and in the gas-liquid mixture supply line 15 the consumer is equipped with controlled valves 23 and a check valve 24. To monitor the operation of the pump compressor 1 and the supply pump 2 and overload exceptions, the latter are equipped respectively with an oil pressure sensor 25 and temperature sensors 26 and 27, as well as a safety valve 28 and 29. For the operation of the pump-compressor in the pump mode, the design of the unit A suction line 30 is provided for the pump-compressor 1 with a capacity of 3. A pipe 30 is equipped with shut-off valves 31 and 32 and an air compensator 33. Filters 35 and 36 are installed in front of the air compensator 33 and in the suction line 34 of the supply pump 2. The unit is equipped with sensors to ensure explosion safety monitoring the presence of hydrocarbons 37 and 38 in places of possible leaks in the areas where the pump compressor 1 and tank 3 are located. Three shutters 39, 40 and 41 are used to shut off the separator 4. The installation is equipped with an automatic system control system of the known type 42, located in a separate shelter at a safe distance from the pump-compressor unit. The automatic control system 42 includes a device for receiving signals from primary sensors, an indication device, an input device, a microprocessor control unit, an electronic archiving unit, a device for transmitting executive signals and a power supply.

The operation of a universal installation for water-gas stimulation of a formation is as follows. In the pump mode, the low pressure gas supply to the compression chamber 11 (valve 22 is closed) and the supply liquid are turned off and the compressor pump 1 is connected by opening the valves 31 and 32 on the suction pipe 30 to the source of the liquid tank 3 and the conduit connected with it. Liquid is pumped to the consumer through pipeline 15 with open valve 39 and closed valves 40 and 41. In the injection mode of the gas-liquid mixture, low pressure gas is supplied to the pump-compressor through the pipeline

12 with the open valve 22 and the supply liquid by the pump 2 through pipelines 34 and 17 (valves 31 and 32 on the pipeline 30 are closed). In this case, the separator unit 4 is disabled (gate valves 40 and 41 are closed, valve 39 is open).

In the gas injection mode, low-pressure gas is supplied to the compression chamber 11 through a pipe 12 with an open valve 22 through an exhaust valve 42. Using a complex device 10, the flow rate, pressure, and temperature of the supplied gas are controlled. The feed pump 2 through pipelines 34 and 17 in the pump-compressor 1 is fed a feed fluid, compressing the gas in the compression chamber 11 to the desired value. Then the compressed gas through the discharge valve 43 is fed through a pipe 15 to the separator block 44 (with the valve 39 closed and the valves 40 and 41 open). In the separator (media separator) 4, the liquid is separated from the gas, which, when the valve 41 is open, is directed through the check valve 24 to the consumer. The liquid separated by the separator 4 is sent through the fluid diverter 5 and an adjustable throttle 6 (its flow rate is measured by the flow meter 16) to the separator 7 to separate the liquid-soluble gas, which is sent to the candle. The liquid freed from the gas dissolved in it is pumped through the pipeline 8 to the tank 3. During operation, the automatic control system 42 receives signals from the primary sensors, displays operating parameters, records the state parameters in an electronic archive, monitors the operating parameters and automatically shuts down the installation when parameters are out of range.

Thus, the claimed utility model makes it possible to use the installation for various types of water-gas treatment on an oil reservoir: for pumping liquid (water), a gas-liquid mixture into it, and implementing the above-mentioned ADH technology, i.e. expand the technological capabilities of the installation. The presence of the instrumentation described above increases the safety and reliability of the installation.

The authors:

V.N. Martynov

IN AND. Grab

V.M. Wolves

R.A. Maksuto

Claims (2)

1. A universal installation for water-gas treatment of a formation, comprising a pump-compressor unit including a reciprocating blower, for example a plunger, with a separate drive, a compression chamber with an inlet valve for gas or gas-liquid mixture supplied from an independent source, and with a discharge valve , a feed pump with a drive in communication with a container for a supply liquid and with a compression chamber through a suction valve and pipelines for supplying a supply liquid and low pressure gas to compression chamber, characterized in that it is equipped with a separator unit, including a media separator, in communication with the outlet pipe of the compression chamber and with a sequentially installed separator of the separated liquid and a regulating throttle, communicated in turn with a separator for separating soluble gas, which is a separate pipe with a built-in pump for pumping liquid is connected to a container for the supplying liquid. 2. The universal installation according to claim 1, characterized in that it is equipped with an automatic control system, a comprehensive device for measuring pressure, flow and temperature of the gas installed in the gas supply pipe to the compression chamber, pressure and temperature sensors on the outlet pipelines of the feed pump and pump compressor unit, a flow meter on the outlet pipe of the feed pump, sensors for monitoring the temperature and oil pressure in the drive part of the feed pump and the specified displacement pump, and the sensors monitoring the presence of hydrocarbons, mounted on the container for feeding liquid and a pump-compressor unit.