RU2559908C1 - Mobile plant for make-up and injection of process fluids - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: plant comprises a frame, a tank, a pump unit, process unions, pipelines and stop valves. The tank consists of bottom settling zone with union to discharge mechanical impurities with volume of V₁ and top working capacity with volume of V₂, ratio of V₁ to V₂ is 0.65/4.35. The tank is equipped with fluid extraction pipeline. In the tank there is fluid return tube and fluid recirculation tube. The fluid extraction pipeline is horizontal and placed at the level of the bottom settling zone; it has the biggest diameter among all pipelines and tubes. The fluid return tube is vertical and descending from the top; it is placed in the centre of the tank and dead-ended from below; it is perforated in the bottom part; it has medium diameter in comparison with all pipelines and tubes. Fluid recirculation tube is parallel to fluid return tube; it is dead-ended from below and perforated along the whole height; it has the least diameter among all pipelines and tubes; dead-ended parts of tubes are placed above the bottom setting zone in the tank; the fluid extraction pipeline is equipped with stop valves allowing connection of the above pipeline with fluid recirculation tube, it is also equipped with filter screen. Oil production is intensified.

EFFECT: preventing scaling, asphaltene, resin and paraffin deposits; protecting downhole equipment from corrosion.

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Description

The invention relates to the oil industry and can be used in the oil field to perform a number of technological operations related to the injection of reagent solutions into the well, to intensify oil production, to combat scaling, asphalt tar and paraffin waxes, to protect downhole equipment from corrosion, to service oilfield equipment.

A well-known site for the preparation of killing fluids, including tanks for preparing saline solution, a filtration unit and storage tanks for consumable reagents. The muffler fluid preparation unit includes muffler fluid preparation tanks with drilling fluid mixers, pumping pumps with piping and shut-off and control valves, and the muffler fluid preparation tanks are equipped with visual level indicators, upper and lower level sensors and densitometers, while the muffler fluid preparation unit is connected with blocks for the preparation of saline solution and dosing of chemical reagents by means of technological lines, and the unit of dosages chemical reagents is equipped with ejectors for the supply of bulk materials (RF Patent for utility model No. 1055345, class 21/21, published on June 10, 2011).

Closest to the proposed invention in technical essence is a mobile installation for the preparation and injection into the well of solutions of chemical reagents, including an automobile chassis, kung, tanks for solutions of chemical reagents, piping with shutoff valves, pump units for filling containers and pumping solutions of chemical reagents into the well, means of control and management. The installation is equipped with a hydraulic station with a hydraulic pump drive from the chassis transmission, and the pumps are driven by hydraulic motors to fill the tanks and pump chemical solutions. The installation includes at least two pressurized containers for various types of chemical solutions and is additionally equipped with two flushing tanks connected by a piping to a pumping unit for pumping chemical solutions and serving to flush containers of chemical solutions and pipelines, while the piping includes distribution combs with shutoff valves, allowing to fill and take solutions of chemical reagents from any container, as well as mixing solutions in each from tanks, pumping them from a container into a container and rinse. Filling and draining of solutions from chemical tanks is carried out according to the scheme “from above” through nozzles mounted on the top covers of the tanks and lowered to the bottom of the tanks, while the tanks are equipped with level gauges, as well as breathing pipes, combined into a common collector connected to the atmosphere through a breathing valve [ RF patent for utility model No. 110426 (Application: 2011118955/06 dated 05/12/2011), cl. F04B 23/04, F04B 35/00, publ. 11/20/2011 - prototype].

A common disadvantage of the known devices is the difficulty of working with process fluids that release solid suspended particles and other insoluble compounds from their composition.

The present invention solves the problem of ensuring work with process fluids that release solid suspended particles and other insoluble compounds from their composition.

The problem is solved in that in a mobile installation for the preparation and injection of process fluids, including a frame, a tank, a pumping unit, process fittings, pipelines and valves, according to the invention, the tank consists of a lower settling zone with a fitting for unloading solids of volume V ₁ and upper working tank with a volume V ₂ to the ratio V ₁ V ₂ is 0.65 / 4.35, the container is provided with fluid withdrawal conduit, the vessel has a liquid return pipe and circulating the liquid conduit, a conduit from The liquid nozzle is horizontal, placed at the level of the lower settling zone and is made with the maximum diameter of all pipelines and nozzles, the liquid return nozzle is vertical and descending from above, placed in the center of the tank, sealed from below, perforated at the bottom and made with an average diameter of all pipelines and pipes, the fluid circulation pipe is made parallel to the liquid return pipe, is sealed from below, perforated to its entire height and is made with a minimum diameter of all pipelines c and nozzles, the plugged portions of the nozzles are placed above the lower settling zone of the tank, the fluid withdrawal pipe is equipped with shutoff valves, which allows connecting the liquid withdrawal pipe to the fluid circulation pipe, and is equipped with a filter net.

SUMMARY OF THE INVENTION

Process fluids in the oil field are inevitably saturated with insoluble substances. It can be either solid suspended particles such as fine sand, or organic particles in the form of particles of paraffins, resins, asphaltenes, etc. A common disadvantage of the known devices used in the oilfield is the difficulty of working with process liquids that are saturated during operation and release solid suspended particles and other insoluble compounds from their composition in the pumping apparatus. The duration of such devices is very short. The present invention solves the problem of ensuring work with process fluids that release solid suspended particles and other insoluble compounds from their composition. The problem is solved by a mobile installation for the preparation and injection of process fluids shown in FIG. one.

In FIG. 1 the following designations are adopted: 1 - frame, 2 - capacity, 3 - pumping unit, 4 - fluid withdrawal pipe, 5 - fluid return pipe, 6 - fluid circulation pipe, 7 - fitting for unloading mechanical impurities, 8 - fitting for the control intake sample, 9 - hatch, 10 - level gauge column, 11 - fitting for installing a thermometer, 12 - fitting for installing an air valve, 13 - fitting for steaming the container, 14, 17, 18 - wedge gate valves with a sliding spindle, 15 - filter element, 16 - non-return valve, 19, 20 - drain valves, 21 - pressure gauge, 22, 23, 24, 25 - pipelines, 26 - perforation on the fluid return pipe 5, 27 - perforation on the fluid circulation pipe 6, 28 - plug on the fluid return pipe, 29 - plug on the fluid circulation pipe.

Mobile installation for the preparation and injection of process fluids works as follows.

Frame 1 with other installation elements is placed in the car body and delivered to the place of preparation and injection of process fluids.

When preparing process liquids, process liquids are poured into the container 2. Open the valves 14 and 18 and close the valve 17. Turn on the pump unit 3 and circulate the liquids from the tank 2 through the fluid withdrawal pipe 4, the valve 14, the filter element 15, the pump unit 3, the check valve 16, the fluid circulation pipe 6, the valve 18 again into the tank 2. In this case, the liquid is sprayed through the perforations 27 on the liquid circulation pipe 6 and is evenly distributed over the volume of the tank 2, which contributes to the complete mixing of the liquids.

When pumping process liquids to the consumer, the valve 17 is opened, the valve 18 is closed and the liquid is pumped from the tank 2 through the liquid withdrawal pipe 4 through the valve 14, the filter element 15, the pump unit 15, the non-return valve 16, the valve 17 and then through the connected pipelines (not shown) by appointment. After the consumer, the liquid saturated with insoluble particles is returned via connected pipelines (not shown) through the liquid return pipe 5 to the container 2. Thus, the liquid is circulated through the container 2 and the consumer. The passage of fluid through the perforation holes 26 of the fluid return pipe 5 promotes uniform distribution of fluid throughout the volume of the container 2, eliminates the impact of a liquid jet on the liquid and settled impurities in the lower settling zone, and prevents the settling of settled particles. The use of a fluid return pipe 5 with an average diameter, on the one hand, provides the necessary fluid flow, and on the other hand, helps to reduce the rate of liquid spraying and the absence of fluid mixing in the tank 2.

In the case of the use of poorly miscible, exfoliating process fluids during breaks in work, the liquids are mixed, as in the preparation. Moreover, the presence of the plug 29 and the perforation holes 27 on the nozzle of the fluid circulation 6 contributes to the minimum impact on settled insoluble particles and the absence of their stirring. The small diameter of the fluid circulation pipe 6 helps to accelerate the flow of the liquid stream and to spray the liquid throughout the volume of the container 2, which eliminates the mixing effect on the layer of settled particles.

At the same time, the large diameter of the fitting of the fluid withdrawal pipe 4 contributes to a slow and smooth fluid intake at the level of the lower settling zone, which also helps to prevent mixing and agitation of settled particles.

After work, settled insoluble particles are removed through the nozzle for unloading of mechanical impurities 7.

If it is necessary to take a control sample of the fluid, a nozzle is used 8. For penetration into the tank 2, a hatch is used 9. The liquid level in the tank 2 is determined by means of a level column 10. A thermometer for measuring the temperature in the tank 2 is installed in the nozzle for installing the thermometer 11. To relieve excess pressure in containers 2 in the fitting for installing the air valve 12 place the air valve. Through the nipple for steaming containers 13 produce steaming. When draining the liquid from the tank 2, the pipelines are drained through the drain valves 19 and 20. Using the manometer 21, the pressure in the tank 2 is determined. A stainless steel mesh is used as a filter element.

Concrete example

Capacity 2 has the following dimensions: length - 2098 mm; width - 2116 mm; height - 3165 mm. Weight - 2003 kg.

Technical characteristics of the installation: working pressure - hydrostatic; - estimated - atmospheric. Temperature: working - 50-90 ° C; Estimated - 120 ° C.

Installation dimensions: length - 4614 mm; width - 2500 mm; height - 3325 mm. Weight - 5397 kg.

The pipeline 4 is made with a diameter of 200 mm at the entrance to the pump with a diameter of 150 mm. The mesh has holes of 0.4 mm with a wire thickness of 1.6 mm. The pipe 6 in the vertical part is perforated to the entire height of 800 mm with holes with a diameter of 20 mm, a total of 80 holes. The height of the perforation allows you to irrigate the mirror of the solution and ensure uniform downward movement of the solution and uniform deposition of suspended solids throughout the tank. The increased diameter of 200 mm of the pipeline 4 ensures a low flow rate of the solution into the pipeline 4, the absence of disturbing vortices and the absence of agitation of solid suspended particles and their entrainment into the pipeline 4. The location of the perforations is as close as possible to the working liquid level in the tank. Branch pipes 5 and 6 are muffled from below, caps are at the same level.

The ratio of the volume of the settling zone V ₁ to the volume of the tank V ₂ is 0.65 / 4.35. Such an attitude is optimal for ensuring any real cycle of technological operations until the settling zone is filled with insoluble particles.

The use of the proposed mobile installation for the preparation and injection of process fluids will allow us to solve the problem of ensuring work with process fluids that release solid suspended particles and other insoluble compounds from their composition.

Claims (1)

A mobile installation for the preparation and injection of process fluids, including a frame, tank, pump unit, process fittings, pipelines and valves, characterized in that the tank consists of a lower settling zone with a fitting for unloading mechanical impurities with a volume of V ₁ and an upper working capacity with a volume of V _2, the ratio of V ₁ to V ₂ is 0.65 / 4.35, the container is provided with fluid withdrawal conduit, the vessel has a liquid return pipe, and the liquid circulation pipe, fluid production conduit configured mountains horizontal, placed at the level of the lower settling zone and made with the maximum diameter of all pipelines and pipes, the liquid return pipe is made vertical and descending from above, placed in the center of the tank, sealed from below, perforated in the lower part and made with an average diameter of all pipelines and pipes , the fluid circulation pipe is made parallel to the fluid return pipe, is plugged from below, perforated to its entire height and is made with a minimum diameter of all pipelines and pipes, plugged parts of the nozzles are located above the lower settling zone of the tank, the fluid sampling pipe is equipped with shutoff valves, which allows connecting the fluid sampling pipe with the fluid circulation pipe, and is equipped with a filter net.

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