The method of preparation of water for injection into injection wells

 

(57) Abstract:

The invention relates to the oil industry and can find application in the preparation of water for injection into injection wells. Provides quality preparation of water for injection into injection wells. The inventive method involves feeding an oil-water emulsion from the production well consistently group metering installation, booster pump station, tank farm, and treatment facilities, flow to wells pump station and the injection into the injection well. On-site group metering stations, booster pump stations and commercial Park of mud wells, barns and similar containers of liquid are taken to a recycling center. Conduct additional water filtration filters with cell sizes of 1-2 mm at the mouth of the injection well, the last processing of the bottomhole zone. Carry out the washing of newly constructed pipelines and water injection wells, which over the last five years that I spent more than two repairs, or on which of the previous repair was 1 year and less. After processing bottomhole injection wells are washed with water and ogranize pressure in the wellbore area and stabilizing capacity of the well. On injection wells with speed reverse flow of fluid, sufficient for the removal of suspended particles on the string of tubing from the bottom when you stop wells, install check valves.

The invention relates to the oil industry and can find application in the preparation of water for injection into injection wells.

A known system for the collection and preparation of oil, which contains the node measuring the production wells, separators of the first and second stages, stage hot separation tank preliminary water discharge from the site fence of the intermediate layer with a pump and pipeline intermediate layer that hosts prepodavatel and node centrifugal separation of the phases connected to the slurry line with sludge trap and having a line output of oil and water. The site of centrifugal separation is made in the form of series connected two-phase Cantatore and three-phase disc centrifuges, the output line of oil from the site of centrifugal separation is connected with the hot stage separation, and the output line of water connected to the system reservoir pressure maintenance (RF Patent No. 2094082, CL 01 D 17/04, publ. 1997.10.27).

The known method provides>P CLASS="ptx2">Closest to the invention to the technical essence is a system of collection products oil field, including group metering stations, booster pump stations with water separator, spray, pump station system of reservoir pressure maintenance, gas pipelines, water pipelines wastewater and Central collection point. The system is divided into several self-contained units containing a booster pump station with a water separator at the inlet and its associated group measuring unit, and cluster pumping station with adjacent wells and pipelines. Oil booster pump station is transported together with the gas pumps pumping gas-liquid mixture (Patent RF №2159892, CL F 17 D 1/00, publ. 2000.11.27 - prototype).

The technical result of the invention is the simplification of the system of collection of oil and gas, increasing its reliability. However, the system does not provide adequate quality preparation of water for injection into the injection well.

The invention solves the problem of improvement of quality of preparation of water for injection into the injection well.

The task is solved in that in the method of preparation of water for injection into the injection RNA installation, at the booster pump station, tank farm, and treatment facilities, flow to wells pumping station and pumped into the injection wells, according to the invention on the territory of group metering stations, booster pump stations and commercial Park of mud wells, barns and similar containers of liquid are taken to a recycling center, carry out the washing of newly constructed pipelines and water injection wells, which over the last five years that I spent more than two repairs, or on which of the previous repair was 1 year and less after processing bottomhole injection wells are washed with the water and limit the injection capacity of the well by installing a wellhead fitting diameter not exceeding 4 mm to restore pressure in the wellbore area and stabilizing capacity of the well and perform additional filtering of the water at the mouth of the filters with a cell size of 1-2 mm, the injection wells with speed reverse flow of fluid, sufficient for the removal of suspended particles on the string of tubing from the bottom when you stop wells, install check valves.

Features of the invention are:

1) podchinyonnogo station, trademark Park and sewage treatment plants, flow to wells pump station and the injection into the injection well;

2) on-site group metering stations, booster pump stations and commercial Park of mud wells, barns and similar containers export of the liquid at the point of disposal;

3) leaching of newly constructed pipelines and water injection wells, which over the last five years that I spent more than two repairs, or on which of the previous repair was 1 year and less);

4) after processing bottomhole injection wells flushing water lines;

5) the same and limitation of injection wells installation of wellhead fitting diameter not exceeding 4 mm to restore pressure in the wellbore area and stabilizing capacity of the well;

6) the same and additional filtering water at the mouth of the filters with cell sizes of 1-2 mm;

7) at the injection wells with speed reverse flow of fluid, sufficient for the removal of suspended particles on the string of tubing from the bottom when you stop wells, installation of check valves.

The sign 1 is usnot inventions

In the development of irrigated oil fields along with the oil extracted a large number of associated water. This water after appropriate preparation is injected into injection wells. When poor quality water treatment is the contamination of critical areas and the injection wells. The injectivity of injection wells is reduced, which entails a reduction in reservoir pressure, deterioration of the displacement of oil, reducing oil. In the proposed invention solves the problem of improvement of quality of preparation of water for injection into injection wells. The problem is solved as follows.

The extracted oil emulsion from the production well through pipelines sequentially sent to group metering installation, booster pump station, tank farm, and treatment facilities, served on cluster pumping station and pumped into injection wells. On-site group metering stations, booster pump stations and commercial Park of mud wells, barns and similar containers of liquid are taken to a recycling center, carry out the washing of newly constructed pipelines and water injection wells, which over the ml and less. After processing bottomhole injection wells are washed with the water and limit the injection capacity of the well by installing a wellhead fitting diameter not exceeding 4 mm to restore pressure in the wellbore area and stabilizing capacity of the well and perform additional filtering of the water at the mouth of the filters with cell sizes of 1-2 mm At the injection wells with speed reverse flow of fluid, sufficient for the removal of suspended particles on the string of tubing from the bottom when you stop wells, install check valves.

Specific example

Method implemented in the system of reservoir pressure maintenance Almetyevsk oil and gas management OAO Tatneft.

Contamination of the oil is due to pumping in the content pipeline excavation pits dug during production and underground repair of wells.

To prevent this phenomenon currently sealed struts pipelines at the mouth of the repaired wells, preventing pumping in the oil content of the barns.

Oil-water emulsion obtained from provides the bones. After group measuring unit fluid is directed to the booster pump station.

On-site group metering stations and booster pump stations there are mud pits and tanks, which serve to bleed fluid from the oil during production, repair, and for receiving fluid from areas of spills on site impulses, barns, etc. Usually of these mud pits fluid pumped into the oil gathering system, and together with the liquid gets there and dirt.

To reduce contamination in the oil gathering system equipped with a recycling waste water (well # 16509). Waste water from the mud pits, tanks and pits at the present time are taken to a recycling center. Ingress of such fluid into the oil gathering system is not allowed. Item waste water consists of two tanks with a capacity of 200 m3. The receiving tank is divided by a partition into two compartments. In the first compartment is the hatch for receiving recyclable water from water tankers. In this compartment occurs the precipitation of the solid impurities contained in the drained liquid, and separating the emulsion into oil and water. Partition mounted so that the second is vesennih particles remains in the second compartment and misses in the second tank, connected with the first tank jumper located at the height of the middle part of the tank. Coming into the second tank and already purified water contains suspended solids and oil products is not more than 50 mg/L.

Treated liquid from the second tank submersible pump ACNW 50×50 is pumped to receive an inverted ESP ESP-125-1500 mounted on the mouth of the injection wells. This centrifugal pump is pumping water into the reservoir. The average volume of recyclable wastewater at this facility equal to 60 m2/day ESP works 12 hours a day.

Sources of pollution produced fluid as it moves from production wells to the treatment plant are bullets in the group metering stations and booster pump stations. Cleaning also allows you to improve the quality injected into the injection well fluid.

To improve the water quality was selected one direction, which includes 168 wells, 5 group metering stations and 2 booster pumping station. The total number of containers in this direction 6 pieces (V200 - 2 pieces, V50 - 4 pieces). Spent cleaning of all tanks. After cleaning, takeyh particles in the prepared system for reservoir pressure maintenance, water parameters, regulated injection of oilfield wastewater: oil - 60 mg/l, suspended solids of 50 mg/l).

With booster pump stations produced fluid is pumped trademark Park and water treatment facilities. When violations of the preparation in water can enter the oil or solid particles. On the quality of training waste water affected by pollution capacitive Park WWTP installations integrated oil, dead and intermediate layer of vertical steel tanks.

To improve the quality of training wastewater and exclude the impact of sewage in the shops integrated oil equipped with insulated sewer system. This system provides for separate collection and disposal of sewage is not associated with the overall training system wastewater. Sewage from stock tanks and sewage treatment plants are collected in separate collection tank and then pumped using a submersible pump in a separate inlet pipeline to well pumping station. There is sewer water individual pumping unit is pumped into specially selected and prepared the field helped to resolve the issue of disposing an intermediate layer of vertical steel tanks and exclude harmful influence on the quality of water contaminated with sewage

For continuous monitoring of the status of preparation of wastewater in all commodity parks installed devices - detectors of the presence of oil in waste water. For the experiment was taken North of Almetyevsk trade Park. This unit is set to the maximum permissible concentration (oil - 60 mg/l, suspended solids of 50 mg/l) of oil in waste water by using the actual selection and analysis of samples for the presence of petroleum products. The readings were taken by the Supervisory system in the control room of the shop maintain reservoir pressure. When exceeding the maximum allowable concentration of oil in waste water is alarm on the remote controller.

The next link in our chain is itself well pump station and supply it to the pipeline.

It was found that the longer the period of operation of the inlet conduit, the more it accumulates various precipitation. When tested cleaning filters at different cluster pump stations using waste water, it was found that the filters become clogged more often, where the inlet conduit having a long lifetime.

Was proposed periodic Cistercian drain tank is draining from the water lines in the liquidation of their impulses. With water when they spout into the drain tank are of different size and composition of suspended solids and oil products. Usually from drain tank while filling all the liquid is pumped back to the pump intake and then into the injection well. It was decided to conduct the cleaning of the drainage tanks cluster pump stations.

Additionally, the drainage capacity is unauthorized draining after leaching, purification of the bottomhole zone, etc. in the course of capital and underground repair of wells. At the moment the drain cover drain tanks are protected from such discharges installing sealed hatches.

To effectively clean the water coming from wastewater treatment plants or trademarks parks were not in the filters at the receiving lines cluster pump stations. Existing filters consisted of a plate with holes with a diameter of 7-8 mm, i.e., they caught only very large solid particles and oil products, while the sizes of the suspended solid particles in waste water treatment plants range from 50 μm to 2 mm Were conducted its own field studies on the selection of the optimal CONA and fresh water. The result was determined gradation cluster pump stations with the necessary dimensions of the filter element in the direction of injection. Depending on the system state download (duration of operation of culverts and any treatment facilities this cluster pumping station) the cell size of the filter ranges from 3 to 1.5 mm For filters installed on the receiving cluster pump stations operating in fresh water, the cell size ranges from 50 to 250 microns. As purification of water pipelines and gathering systems and preparation of waste water the cell size of the filters is reduced.

Another source of contamination of the injected water are already under construction and the existing water injection wells.

New conduits conducted field research to identify the extent and quality of pollution construction of culverts. Measures are developed for the cleaning of the pipe during construction of the new pipeline.

Under existing conduits defined criteria for the need for primary leaching water. For the main criterion adopted a number of bottomhole treatments at the injection well.

To reduce the initial to for the last five years that I spent more than two repairs. If after start of injection wells less than 5 years, then spend the washing water from those wells, which after the previous repair and ongoing at the moment of repair was 1 year and less.

Using the criterion of selection of water for washing is defined and implemented a priority list of existing conduits for washing.

During operation of the injection wells are subject to periodic repair. During maintenance of the wells in the barns accumulate the products of the leaching wells, the remains of process liquids and so on, All of this was stored either back into the conduit and, consequently, again at the bottom of injection well, or located near the oil gathering system. To prevent this, steps were taken to prevent the pumping of fluid in the linear portion of the conduits, providing for the installation of the seal on the linear portion of the conduit upon delivery of the wells in the repair.

Before execution of complex of works on the treatment of bottom-hole zone of the well is stopped to reduce wellhead pressure. During this period, and during repair pressure in the region of the well decreases. As a result of this povyshennuyu pickup (hungry well). Accordingly, a large flow of water pushes the dirt out of the conduit in the bottom zone. As a result of this bottom-hole zone quickly hammered and reduces the effect of the bottomhole zone treatment. To counteract this phenomenon on the development period well after the bottomhole zone treatment should be limited to increased injection capacity of the well by installing a wellhead fitting. The diameter of the installed fitting should not exceed 3-4 mm

The volume of liquid passing through the nozzle, measured by the formula

Q=m·S·(2·(P1-P2)/)1/2,

where m is the coefficient of discharge depends on the configuration port fitting (for cylindrical m=0,71; for converging cone m=0,94); S - area of the orifice fitting, m2; P1-R2- the pressure drop across the nozzle (PA); p is the density of the injected fluid, t/m3.

Fitting leave for the entire period of completion after the bottomhole zone treatment, that is, until saturation of the bottom-hole zone of the well. At the point of saturation is taken stabilization capacity of the well between the two measurements during well completion.

At the mouth of the injection wells, Sukachev the s with cell sizes of 1-2 mm. Installation estuarine filters allows you to lengthen the turnaround time injection wells to leaching conduit.

In some injection wells with high pressure bottomhole when you stop pumping station or by reducing the pressure in the conduit below a certain value, the fluid from the reservoir begins to flow into other wells with a lower wellhead pressure (shot hole). While peeing fluid carrying out of the bottom zone in the conduit suspended particles and oil products, polluting it. Some amount of this mud when you start pumping station pumped in neighboring wells. At the mouth of these wells were installed check valves, which excluded this process. Install a check valve on all injection well is not always justified, since a small flow of fluid between the wells as you stop pumping at pumping station in winter prevents freezing of wells. Therefore, it is necessary to install a check valve only peeing wells, in which the rate of return flow of fluid sufficient for the removal of suspended particles on the string of tubing from the bottom. For TV the/sec.

Implementation of the proposed method has improved the quality of water treatment system for reservoir pressure maintenance, to reduce the number of treatments bottomhole injection wells, to reduce the cost of maintaining reservoir pressure at the field.

The application of the proposed method will improve the quality of preparation of water for injection into the injection well.

The method of preparation of water for injection into injection wells, including the flow of oil-water emulsion from the production well consistently group metering installation, booster pump station, tank farm, and treatment facilities, flow to wells pump station and the injection into the injection well, wherein the on-site group metering stations, booster pump stations and commercial Park of mud wells, barns and similar containers of liquid are taken to a recycling center, conduct additional water filtration filters with cell sizes of 1-2 mm at the mouth of the injection well, the last processing bottom-hole zone, carry out the washing of newly constructed pipelines and water injection wells, which for the last five, the donkey bottomhole zone treatment injection wells are washed with the water and limit the injection capacity of the well by installing a wellhead fitting diameter not exceeding 4 mm to restore pressure in the wellbore area and stabilize the water injection wells, injection wells with speed reverse flow of fluid, sufficient for the removal of suspended particles on the string of tubing from the bottom when you stop wells, install check valves.



 

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