The way of the development of oil deposits

 

(57) Abstract:

The invention relates to the oil industry and can be used in the development of oil deposits. To facilitate injection of water into the injection well. The inventive method includes the water supply pipeline through the estuarine valves to receive a separate pump, water injection into the injection well through the tubing separate pump to provide the necessary injection pressure and oil extraction through production wells. According to the invention initially the development is carried out with injection of the working agent in cyclic mode from the pumping station to identify areas with low formation pressure. On the site of the Deposit with reduced reservoir pressure is placed a separate pump on the surface at the mouth of the injection wells. The performance of the individual pump pick up sufficient to ensure that the maximum capacity of the well. Download the working agent separate pump in the individual mode via the injection well to the recovery reservoir pressure and increase flow rates in all the surrounding producing wells. Ostandard pump. Off a separate pump and restore the pumping of the working agent in cyclic mode from the pumping station.

The invention relates to the oil industry and can be used in the development of oil deposits.

There is a method of developing oil deposits, which maintain reservoir pressure by injection of the displacing agent. Determine the site of the Deposit selection of oil, the volume of the injected displacing agent, the monitoring process. Determine the effectiveness of the process of maintaining reservoir pressure and its impact on the reservoir. Change technology for reservoir pressure maintenance (RF Patent No. 2142557, CL E 21 In 43/20, publ. 1999.12.10).

The disadvantage of this method is the difficulty of maintaining reservoir pressure at all parts of the lithologically heterogeneous deposits with Central injection of working agent.

Closest to the invention to the technical essence is a method of water injection into the injection well, including water supply pipeline through the mouth shut-off valve on the pump intake, the water injection is carried out, providing the necessary injection pressure is compliance using the packer, mounted above the roof of the reservoir. Pump installation for implementing the method consists of tubing, wellhead valves, pipe, submersible electric motor located in the upper part of the pump unit, and a sectional pump, the number of sections which are interconnected with the discharge pressure, and in the lower part of the unit placed compensator vertical loads for removing the linear displacement of pump-compressor pipes (RF Patent No. 2132455, CL E 21 In 43/00, publ. 1999.06.27 - prototype).

The known method provides increased efficiency of the development the alignment of the displacement front and involvement in the development of low-permeability reservoir at a single site heterogeneous lithological deposits.

However, the method is difficult to implement due to the placement of the pump in the injection well. The changeover of the modes of operation of the pump or switching to water injection from water is possible only after removing the pump from the well.

The invention solves the problem of the ease of water injection into the injection well.

The task is solved in that in the method of developing a petroleum reservoir, including water supply pipeline through the estuarine valves n the pump to provide the necessary injection pressure and oil extraction through production wells, according to the invention initially the development is carried out with injection of the working agent in cyclic mode from the pumping station to identify areas with low formation pressures, on the site of the Deposit with reduced reservoir pressure is placed a separate pump on the surface at the mouth of the injection wells, the performance of the individual pump pick up sufficient to ensure that the maximum capacity of the well, pump working agent separate pump continuously via the injection well to the recovery reservoir pressure to the original for this Deposit and capacity flow rates in all the surrounding producing wells stopped producing wells alternately from first reacted to the latest reacted to the work of a single pump, off a separate pump and restore the pumping of the working agent in cyclic mode from the pumping station.

Features of the invention are:

1) water supply pipeline through the estuarine valves to receive a separate pump;

2) the injection of water into the injection well through the tubing separate pump providing neobhodimosti injection working agent in cyclic mode from the pumping station to identify areas with low reservoir pressure;

5) on the site of the Deposit with reduced reservoir pressure placing a separate pump on the surface at the mouth of the injection wells;

6) selection of the performance of a single pump is sufficient to ensure that the maximum capacity of the well;

7) upload a working agent separate pump continuously via the injection well to the recovery reservoir pressure to the original for this Deposit and capacity flow rates in all the surrounding producing wells;

8) stop producing wells alternately from first reacted to the latest reacted to the work of a single pump;

9) off a single pump and recovery injection working agent in cyclic mode from the pumping station.

Signs 1-3 are common with the prototype, signs 4-9 are the distinguishing features of the invention.

The invention

In the development of oil in some areas lithologically heterogeneous deposits very often the selection of oil ahead of the injection of the working agent, especially under cyclic injection. This reduces reservoir pressure, reduced flow rates of producing wells, samelevel the injection of the working agent into the injection well in an individual mode of operation while maintaining a circular mode for other wells, allows you to increase pressure on the site of the Deposit and to restore the flow rates of producing wells. However, used pumps are placed in the injection well, which complicates the changeover of the modes of their operation. The invention solves the problem of the ease of water injection into the injection well.

The problem is solved as follows.

The development of oil deposits are injection working agent through the injection wells in cyclic mode from the pumping station to identify areas with reduced reservoir pressure and to reduce the reservoir pressure at the site of the Deposit. Cyclic mode of injection of the working agent in situ changes the flow direction of the water and, thus, the displacement from the formation of additional amounts of oil. When this is taken oil through production wells. However, the cyclic mode of injection of the working agent inevitably leads to a decrease in reservoir pressure in wells with low acceleration. Periodicity implies of the time to stop injection wells. While traditionally applied cyclic operation of injection wells half the time works well, and the rest of the bore of octanol the Jin wasted due to loss of oil. To translate the injection of water from the round-Robin mode in the stationary impossible due to loss of oil by high-performance wells due to premature flooding. Therefore, to raise the reservoir pressure at the site of the Deposit using a separate mobile pump, which is installed at the wellhead and which pumped water into the selected injection well.

Other injection wells operate in a cyclic mode water injection. For this purpose, in at least one injection well to stop the flow of water from the pumping station and water supply pipeline through the estuarine valves on the intake of the pump alone, and through him spend the injection of water into individual (permanently or another period citation) mode to the injection well through the tubing to provide the necessary injection pressure.

A separate pump is placed on the surface at the mouth of the injection wells and the performance of the individual pump pick up sufficient to ensure that the maximum capacity of the well. Download the working agent separate pump continuously via the injection well to wassim wells.

When you restore reservoir pressure in this area deposits stop producing wells alternately from the first, they responded to the increase in reservoir pressure increasing rate, until the last, they responded to the work of a single pump. Then separate off the pump and restore the pumping of the working agent in cyclic mode from the pumping station. Initiate producing wells and continue the development of deposits to the possible re-reducing reservoir pressure, then connect a separate pump and repeat the operation. Similar operations are performed on other parts of the deposits.

In the oil recovery increased deposits, control becomes a separate pump, simplifying the injection of water into the injection well in comparison with the injection pump placed in the well.

A specific example of the way

Develop an oil field with the following characteristics: the depth of deposits 1147,5 m, the oil-water contact depth of 1000 m, the reservoir pressure of 12.5 MPa, reservoir temperature 28C, the porosity of 16%, permeability 0,171 μm2the saturation of 0.8, the viscosity of the oil at reservoir conditions 180,2 MPas, density of oil orowy. Balance reserves fluctuate layers 17,000 to 100,000 thousand tons

Download the working agent in cyclic mode through 180 injection wells, take away oil after 600 producing wells. Cyclic mode assumes 15 days. the injection of water and 15 days. stop pumping.

Select the oil through the production wells. On the site of the Deposit with a single injection wells and four production wells have noted a decline in reservoir pressure by 10% and reducing the output of the wells 7-12%.

To raise the reservoir pressure at the site of the Deposit in the injection well to stop the flow of water from the pumping station and water supply pipeline through the estuarine valves on the intake of the pump alone, and through him are pumping water continuously to the injection well through the tubing to provide the necessary injection pressure. As a separate mobile use pump brand ESP-80, which is mounted on the mouth of the injection wells and which pumped water into the selected injection well. Other injection wells in deposits of work in a normal cyclic mode water injection. Download rabochego pressure and as a result, the growth of production to all the others reacting producing wells. After you restore reservoir pressure in this area deposits stop producing wells alternately from the first, they responded to the increase in reservoir pressure increasing rate, until the last, they responded to the individual pump is then turned off by a separate pump and restore the pumping of the working agent in cyclic mode from the pumping station. Initiate producing wells and continue the development of deposits to a new decline in reservoir pressure, and then connect a separate pump and repeat the operation. Similar operations are performed on other parts of the deposits.

As a result, the pace of development of deposits increases, control becomes a separate pump, simplifying the injection of water into the injection well in comparison with the injection pump placed in the well.

The application of the proposed method will simplify the regulation of water injection into the injection well, to enter the active development of low-productivity areas of the Deposit.

The way of the development of oil deposits, including water supply pipeline through the mouth of the priori pipes separate pump to provide the necessary injection pressure and oil extraction through production wells, characterized in that, initially, the development is carried out with injection of the working agent in cyclic mode from the pumping station to identify areas with low formation pressures, on the site of the Deposit with reduced reservoir pressure is placed a separate pump on the surface at the mouth of the injection wells, the performance of the individual pump pick up sufficient to ensure that the maximum capacity of the well, pump working agent separate pump in the individual mode via the injection well to the recovery reservoir pressure and increase flow rates in all the surrounding producing wells stopped producing wells alternately from first reacted to the latest reacted to the work of a single pump, off a separate pump and restore the pumping of the working agent in cyclic mode from the pumping station.

 

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