RU2456435C2 - Mobile chemical plant for supply of chemicals for treatment of oil-gas production wells and pipelines - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device is made in the form of box body installed on carriage frame of transport vehicle and divided into instrument compartment and process compartment by means of blind sealed partition. Control cabinet, flushing water tank, water supply station, direct-flow water heater, earthing cable and powder fire-fighting module is installed in instrument compartment. Tanks for various types of chemicals with a dosing pump for each of them, drain tank, self-priming pump, powder fire-fighting module, video camera, electric contact pressure gauges, safety valves, non-return valves, flow metres, suction lines, delivery lines and explosion-proof control stations are installed in process compartment. Each tank is provided with possibility of being changed over to dosing pump of any other of the above tanks. Plant is equipped with connection assembly to the treated well, which allows disconnecting the delivery line from treated well and in case it is impossible to close the pipe gate valve, or with pipe gate valve passes, as well as with power supply in the form of synchronous generator located in the front or rear part of carriage frame cardan drive from power take-off device of transport vehicle.

EFFECT: increasing the number of treated wells during a working shift.

3 cl, 1 dwg

Description

The invention relates to equipment for the periodic injection of various types of inhibitors into wells, and to the maintenance of stationary units and chemical dosing units installed at well sites of fields.

Field development at the third and fourth stages is characterized by a significant decrease in oil production by progressive watering of the products and a decrease in the well stock due to shutdown due to water flooding, and the transfer of almost the entire well stock to a mechanized production method.

Both large and small oil production companies are not always able to quickly organize and install or reinstall to another well a stationary chemical dosing unit, where inhibitor protection is necessary. For the installation of a stationary chemical dosing unit at a well, a number of approvals must be completed. Order transport for reinstallation, run a cable line, connect a chemical dosing unit (UDC), etc., which requires an increase in capital and operating costs.

Unlike stationary units and chemical dosing units installed at cluster sites, MBRH does not require installation and dismantling work, which are costly and time-consuming.

A mobile device for treating wells is known from the prior art, comprising a plunger pump configured to dose the inhibitor into the annulus of the well from a reservoir that is connected to the inlet of the plunger pump through an intake line, an injection line connected to the outlet of the plunger pump and equipped with a check valve, inhibitor flow control means. The device is mounted on a cross-country vehicle made with the possibility of moving between the boreholes of the bushes of one or several fields and their sequential processing, while the device is equipped with at least one additional tank connected along the suction line to the inlet of the plunger pump, a tank with flushing fluid, and also a signaling pressure gauge installed on the discharge line, and is configured to sequentially supply two or more types of inhibitors to the annulus th space to enable delivery of a predetermined amount of each inhibitor in the reaction zone through the extracted liquid under its own weight (RU 2314412 C1, 10.01.2008 [1]).

The device known from [1] does not provide for the possibility of simultaneous supply of two or more component chemical agents of the same purpose during processing of wells and pipelines. The disadvantage of this analogue is the inability to pump encapsulated, microgranular products, flammable liquids (LVH). Also, this device does not provide for the possibility of servicing stationary UDC of chemical dosing devices, reagent farm units (BRH) during processing. This device cannot replace one type of inhibitor with another in stationary installations. The disadvantage of this analogue is the impossibility of pumping large volumes of chemicals in the process of servicing several facilities during a single shift. It also does not contain fire extinguishing means, means of automatic shutdown after pumping a predetermined amount of a chemical agent, means of automatic shutdown when the discharge line is broken. This device does not provide for its reinstallation and further use in the event of a car breakdown, without dismantling all systems, tanks, pumps, etc. In addition, the device is made in one compartment, as a result of which there is a likelihood of accumulation of flammable vapors and, as a result, the occurrence of a fire, explosion.

The closest analogue to the claimed unit is a mobile inhibitor dosing unit, containing technological equipment installed inside the car body, consisting of two tanks, a plunger pump, a drive, a suction and pressure line with shut-off valves and instrumentation, a recirculation line, fine filters, located on the suction line after the tanks, and the drive from the transfer case was used as a drive for the operation of technological equipment car brand URAL 4320, or UAZ 3962, or UAZ 390944 ((RU 89600 U1, 12/10/2009 [2]).

The device known from [2] does not provide for the possibility of simultaneous supply of two or more component chemical agents of the same purpose during processing of wells and pipelines. The disadvantage of this analogue is the inability to pump encapsulated, microgranular products, flammable liquids. Also, this device does not provide for the possibility of servicing stationary UDH, BRH during processing. This device cannot replace one type of inhibitor with another in stationary installations. The disadvantage of this analogue is the impossibility of pumping large volumes of chemicals in the process of servicing several facilities during a single shift. It also does not contain fire extinguishing means, means of automatic shutdown after pumping a predetermined amount of a chemical agent, means of automatic shutdown when the discharge line is broken. This device does not provide for its reinstallation and further use in the event of a car breakdown, without dismantling all systems, tanks, pumps, etc. In addition, the device is made in one compartment, as a result of which there is a likelihood of accumulation of flammable vapors and, as a result, a fire or explosion.

The objective of the claimed unit is to create a mobile structure that provides simultaneous supply (injection) to the wells of various types of inhibitors and maintenance of stationary units and chemical dosing units installed on the well sites of the fields.

The problem is solved in that the mobile unit of the reagent farm for supplying chemical reagents for processing oil and gas producing, injection wells, pipelines and servicing stationary chemical dosing units is made in the form of a van body mounted on the chassis of a vehicle or a towed device of a vehicle and divided into an instrument compartment and technological compartment by means of a blank sealed partition, while a control cabinet, a container with flushing water, water supply station, instantaneous water heater, grounding cable and powder fire extinguishing module, and tanks for different types of chemicals with a metering pump for each of them are installed in the technological compartment, while each tank is made with the possibility of switching to a metering pump from any other of these containers, a drainage tank, a self-priming pump, a powder fire extinguishing module, a video camera, electrical contact pressure gauges, safety valves, check valves a, flow meters, suction lines, discharge lines and explosion-proof control stations, and the unit is equipped with an attachment to the well being processed, which allows disconnecting the injection line from the well being being processed if it is not possible to close the pipe gate or by passes of the pipe gate, as well as a power source made in the form a synchronous generator located in the front or rear of the chassis frame with a cardan drive from the power take-off of the vehicle.

The difference between the claimed unit and the closest analogue known from [2] is the separation of the van body into the instrument rod and the technological compartment by means of a blank sealed partition, the presence of an additional metering pump, the execution of chemical containers with the possibility of switching from one pump to another, equipping the unit with a unit for joining the well being processed, which allows disconnecting the injection line from the well being being processed in case of impossibility to close the pipe gate or starts of pipe valves. The presence of the main power source, which is a synchronous generator located in the front or rear of the chassis frame with a cardan drive from the vehicle’s power take-off, as well as a spare diesel or gas generator is installed in the first instrument compartment.

The design of the inventive mobile reagent farm unit installed on a transport or trailer device, moving from one well to another, allows periodic treatment by inhibitors and maintenance of stationary reagent farm units not only at one field, but also in different regions where inhibitor protection of wells must be started without loss of time, thereby reducing the risk of environmental pollution and loss of oil production.

In the event of a car breakdown, it is not necessary to dismantle the tanks, line pumps, etc., the MBRH van is disconnected from the frame of the broken car and is completely rearranged to another working car or trailing device.

The proposed MBRH design allows for a single operation to connect to the annulus of the well to supply several types of reagent and fluid solutions, as a result of which, in one technological operation, it is possible to treat not only the surface of the well tubing, but also pumping equipment while reducing connection time to the annulus. This makes it possible to increase the resource of oilfield equipment.

Also, the proposed MBRH allows for the sequential injection of two or more types of liquids, reagent solutions, ensuring the delivery of the calculated amount of each solution or liquid to the reaction zone for pump reception through the produced liquid under its own weight.

The design of the panel body van, riveted, without wheel-mounted niches, made according to the frameless technology using sandwich panels, divided into two compartments, allows you to set the required amount of equipment and the number of tanks for different types of chemicals, any volume, drainage and flushing tanks.

The execution of equipment located in the technological compartment in an explosion-proof design allows you to work on oil and gas production facilities and with flammable liquids, solutions and reagents. As chemical reagents, encapsulated microgranular products or liquid solutions of demulsifiers of corrosion inhibitors can be used.

The invention is illustrated in the drawing.

The drawing shows a schematic diagram of MBRH.

The inventive block MBRH is made in the form of a box body mounted on a vehicle or a towing device of a vehicle, contains an instrument compartment and a technological compartment separated by a partition. The positions in the diagram indicate:

1, 2, 11, 12, 13, 14, 15, 20, 21, 22, 33, 34 - ball valves of the suction lines;

3 - filters;

4 - flowmeter counters;

5 - dosing pumps ND No. 1, ND No. 2;

6 - check valves;

7 - safety valves;

8 - electrical contact pressure gauges;

9 - discharge lines of the pumps 5;

10 - ball valve of the filling line of stationary dosing units UDE, BRH;

16, 18, 19 - ball valves of filling lines and mixing lines;

17 - ball valves filling line flushing water;

23, 24 - line discharge of the working environment in the drainage tank D-5;

25 - refueling line for stationary UDE, BRH;

26 - self-priming pump;

27 - suction line of pumps 5 and 26;

28, 30, 31 - filling lines of tanks E-1, E-2 and E-3 for chemicals;

29 - refill line for washing water;

32 - suction line of washing water;

35 - flushing line to the drainage tank D-5;

36 - ball valve of the drainage tank D-5;

37 - control cabinet MBRH;

38 - synchronous generator;

39 - water supply station;

40 - instantaneous water heater;

41 - powder fire extinguishing modules;

42 - video cameras;

43 - explosion-proof control posts;

44 - grounding cable;

D-4 - capacity for flushing water.

The MBRH installation is mounted on the chassis of any vehicle and trailer device. Box body van, riveted, without wheel arches, made according to the frameless technology using sandwich panels. The power source is a synchronous generator 38 located in the front or rear of the chassis frame with a cardan drive from the power take-off.

Before carrying out the work, the discharge line 9, after assembly, is pressed to the expected working pressure one and a half times before the start of injection. The manifold gate valve is closed to the manifold, the manifold gate valve (annular) connected to the injection line 9 of the MBRH is opened, and the inhibitor is pumped by the metering pump type 5 ND into the annulus of the well in the required volume. When injecting chemicals on the line 9 of the injection wellhead must be installed check valve 6.

The controlled injection of the treated wells allows the injection of inhibitors in predetermined volumes, preventing the overrun of inhibitors or the saving of inhibitors by reducing the injection of inhibitors into the well. Control of the injected volume of the inhibitor is carried out using the meters of the flow meters 4 or on the remote control 43 dose management.

The control of the injection pressure is carried out using the electrocontact manometers 8. On the electrocontact manometer 8, the lower and upper limits of the injection pressure are set. Protection by the lower limit of the injection pressure allows you to automatically turn off the pump 5 in case of depressurization of the discharge line 9 or suction line 27 at the intake of pump 5. Protection by the upper limit of the injection pressure allows you to turn off the pump 5 in the event of a plug or lack of circulation in the annulus.

In addition, the MBRH installation is equipped with safety valves 7, for the automatic release of excess liquid medium from the high-pressure injection line 9 with an excessive increase in pressure into the low-pressure system - the D-4 drainage tank, which ensures the safe operation of the plants and the prevention of accidents.

In case of emergency shutdown of pump 5, a non-return valve installed on the injection line 9 at the wellhead shuts off the air-gas mixture along the injection line 9 in the opposite direction through pump 5 in tanks E-1, E-2, E-3, which can lead to rupture of tanks E -1, E-2, E-3 and accidents. To prevent an accident, the MBRKh installation is equipped with a well attachment unit, which allows disconnecting the injection line 9 from the well in cases of inability to close the annular valve or by strong passes of the annular valve.

In MBRH, tanks E-1, E-2, E-3 are installed for different types of inhibitors, which allows the treatment of wells with different types of inhibitor. A pump 5 is installed for each of the tanks, with the help of which various inhibitors are pumped into the annulus of the wells. The strapping of the MBRH installation is performed in such a way that when one pump 5 fails, it is possible to switch to the second pump 5. Given the remoteness of the field from the repair base, it is not necessary to call the repair team to carry out repair work. With a universal strapping of the suction line 27, the pumps 5 are interchangeable. To perform flushing of lines 9 and 27 and equipment from inhibitors, a self-priming pump 26 is installed in the MBRH installation, which is connected by a suction line 27 with an E-4 flushing (process water) tank, and a flushing line 35 is connected with a D-5 drainage tank.

A feature of this installation is the ability to service stationary units and chemical dosing units installed on cluster sites, filling them with the required amount of inhibitors.

The versatility of this MBRKh installation allows not only to periodically inject various types of inhibitors into the wells simultaneously by feeding them from different mixing tanks in the suction line by entering to ND No. 1 further through the injection line into the well, as well as serving stationary units and UDC, UDR, UDE, DBC installed on the well pad of the fields by refueling through the injection line ND No. 2 at the time when the well is being processed through ND No. 1, thereby freeing up personnel to perform more important tasks and reducing customer costs.

If necessary, an MBRH installation can replace one type of inhibitor with another in permanently installed units and installations at cluster sites, for this, water is supplied through a flow heater 40 to a permanently installed unit or installation of chemical reagents and washed by connecting a self-priming suction line 27 to the unit or installation pump 26.

Flushing products are downloaded into the D-5 drainage tank and delivered to a specially designated place equipped for disposal or destruction.

After the supply of each type of liquid or reagent solution is completed, the discharge line is washed with washing liquid.

To increase efficiency, with the sequential injection of two or more types of liquid, solutions, a reagent solution, a liquid with a higher density, is first fed into the well during one treatment.

The proposed MBRH installation is carried out on the basis of any vehicle and towing devices in a panel box van, riveted, without wheel arches, made using frameless technology using sandwich panels, according to the proposed group of inventions, the method and device relates to technology. According to the method, the purpose of the MBRH installation is the maintenance of stationary units and chemical dosing units installed on cluster sites. Injection of corrosion inhibitors, scaling, inhibitors and solvents asphalt resinous paraffin deposits further (AFS), flammable liquids (LVF) for the protection of oilfield equipment, the method of periodic treatment of wells in the annulus of wells.

According to the method and device according to the proposed group of inventions, the MBRH installation is used in fields in the processes of processing wells, pipelines and servicing stationary chemical dosing devices.

MBRH is used for processing various types of inhibitors of oil pipelines and water pipelines, it is intended for servicing stationary UDC of chemical dosing devices, UDE for electric dosing units, BRX units of reagent facilities and periodic well treatment, it is manufactured in a heat bottle and has two compartments - an instrument and a technological one.

In addition to liquid products, MBRH can also encapsulate, micro-granulated products, and at the same time service stationary units of the reagent farm, and process wells and pipelines.

The MBRH installation is equipped with an accession unit that allows you to disconnect the injection line from the well, the pipeline in cases of impossibility to close the hermetically annular valve or valve on the pipeline.

Tanks for different types of chemicals, inhibitors are installed in the MBRH installation, which allows the treatment of wells with different types of inhibitor. An electric pump unit has been installed for each tank, with the help of which various chemicals, inhibitors can be pumped. The MBRH installation is designed in such a way that if one electric pump unit fails, you can switch to the second electric pump unit. Given the remoteness of the field from the repair base, it is not necessary to call the repair team to carry out repair work. With universal piping of the suction line, the electric pump units are interchangeable. For washing lines and equipment from chemicals, inhibitors, a self-priming pump is installed in the MBRH installation, which is connected by a suction line to the capacity of the process water, and the washing line is connected to a drainage tank.

A feature of this installation is the ability to service stationary units and chemical dosing units installed in the fields.

Performing work on periodic treatment of wells into the annulus of wells, at the same time, the same MBRH installation can serve stationary UDC, BRX, UDE, UDR, filling them with the required amount of inhibitors using ND No. 2.

When MBRH is used for treatments for each treatment object, the necessary amount of the applied chemical reagent, solution, and liquid is calculated by calculating the required amount taking into account the frequency between treatments from several hours to several days a month. Thus, it is possible to process a large number of wells and pipelines using one MBRH device.

The dosage of the reagent is calculated in liters based on the working concentration of the reagent used, the flow rate of oil, liquid or water and the period between treatments. Thus, the reagent is injected taking into account the real flow rate of each processed object, so as to ensure the required dosage level of the reagent.

Calculation of the amount of chemical for periodic processing of the well, the pipeline is made according to the following formula:

Q _chem = Q _well * (N / 100) * d * T / 1000 / ρ,

where Q _chem. - amount of chemical for injection, liter;

Q _well - flow rate of a well or pipeline, m ³ / day;

N is the water cut of the well or pipeline,%;

d is the dosage of the chemical, g / m ³ ;

T - frequency of injection, day;

ρ is the density of the chemical, g / cm ³ .

Example.

For processing an object with a flow rate of 100 m ³ / day by liquid and a water cut of 90%, the amount of reagent for periodic injection with an interval of 7 days, at a dosage of 10 g / m ³ and a density of chemical agent 1.1 will be:

100 * 90/100 * 10 * 7/1000 / 1.1 = 5.7 liters.

The main indicator of the effectiveness of the method of periodic chemical processing is the failure-free operation of the treated object, i.e. an increase in its overhaul period.

To obtain operational information, on the basis of which it can be concluded that the method of periodic processing with chemicals and the correct interval — the period between treatments, is determined by determining the residual content of the chemical. It is believed that the minimum effective concentration of a chemical detected in an amount of 1-3 mg / l is sufficient to ensure the length of the overhaul period. It is also possible to monitor and analyze the residual chemical content to optimize reagent consumption during periodic processing.

If necessary, an MBRH installation can replace one type of inhibitor with another in permanently installed units and installations at cluster sites; for this, water is supplied through a flow heater to a permanently installed unit or installation of chemical reagents and rinsed by connecting a suction pump line to the unit or installation.

Reducing the time spent on one well, the operation allows processing at least 15 wells during a shift, as well as servicing stationary BRHs, UDEs, etc., filling blocks and plants with chemical reagents located at cluster sites, pipelines, and other installations. Capital and operating costs, more efficient use of staff time, reduction. The mobile unit of the reagent farm provides a reduction in time spent on one well operation and maintenance of stationary blocks of the reagent farm, therefore, the number of wells being processed during the work shift increases.

Claims (3)

1. A mobile reagent farm unit for supplying chemical reagents for processing oil and gas wells and pipelines, made in the form of a van body mounted on a vehicle chassis or a towing device of a vehicle and divided into an instrument compartment and a technological compartment by means of a blank sealed partition, a control cabinet, a flushing water tank, a water supply station, a flowing water heater, an earth cable and a powder module are installed in the instrument compartment about fire extinguishing, and in the technological compartment there are tanks for different types of chemicals with a metering pump for each of them, each tank being made with the possibility of switching to a metering pump from any of the other tanks, a drain tank, a self-priming pump, a powder fire extinguishing module , video camera, electrical contact pressure gauges, safety valves, non-return valves, flow meters, suction lines, discharge lines and control stations are explosion-proof, and the unit it was rudovan by the unit of accession to the processed well allowing to disconnect the injection line from the processed well in case of impossibility to close the pipe gate or passes of the pipe gate, as well as a power source made in the form of a synchronous generator located in the front or rear of the chassis frame with a cardan drive from the selection box vehicle power. 2. The block according to claim 1, characterized in that the said equipment installed in the technological compartment is made in explosion-proof design. 3. The block according to claim 1, characterized in that the encapsulated microgranular products or liquid solutions of demulsifiers of corrosion inhibitors are used as chemical reagents.