RU2688706C1 - Device for arrangement of cluster discharge and recycling of formation water - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: proposed device for arrangement of cluster discharge and recycling of formation water relates to equipment and technologies of oil industry and can be used for arrangement of cluster discharge and utilization of extracted formation water. Device has an inclined lining of a Christmas tree, a production string drilled at angle of 45° from the Y axis, a pipe insert and a shank or an electric centrifugal pump unit lowered on the tubing string to ensure intake of purified formation water.EFFECT: increased efficiency of preliminary discharge of formation water at deposits with high water cut, assurance of compliance of quality of discharged water as per indicator of residual oil products and mechanical impurities, reduced time of incoming water treatment.1 cl, 1 dwg

Description

The claimed invention - Oblique pit preliminary discharge of formation water (NSHPSV), refers to the equipment and technologies of the oil industry and can be used to organize the discharge and recycling of produced water.

The closest technical solution for the essential features of the claimed invention and selected as a prototype is a method of cluster discharge and disposal of produced water, including measuring the injection capacity of the injection well, supplying one or more production wells to the well or hole for preliminary discharge of water, measuring the amount crude oil and gas, as well as the water cut of crude oil, oil and water densities entering the well or hole for preliminary discharge of water, dividing borehole products in it to partially dehydrated oil, gas and water, the direction of partially dehydrated oil and gas to the collection reservoir, the flow of discharged water into the injection well, determining the compatibility of the discharged water with the water of the reservoir, which is injected from the injection well, while the injection water is compatible the well is equipped with a device for creating water pressure sufficient for pumping water into the formation, made with the possibility of changing the flow and set to the minimum flow, determine the corresponding the quality of the discharged water to the geological conditions of the reservoir, when the quality of the discharged water is unsatisfactory, it is sent to the collecting reservoir, if the quality of the discharged water is satisfactory, it is sent to the injection well, the amount of the discharged water coming from the injection well is measured, then the device feed is increased to create water pressure, and this increase is made as long as the quality of the discharged water satisfies the geologist the traditional conditions of the reservoir / patent of the Russian Federation No. 2548459, IPC Е21В 43/20, 43/38, publ. 04.2015 /.

The disadvantage of this method is the lack of efficiency due to the insufficient amount of time to ensure compliance with the quality of discharged water in terms of residual petroleum products and mechanical impurities.

The problem to which the invention is directed, is an effective preliminary discharge of produced water in fields with high water content, ensuring compliance with the quality of discharged water in terms of residual petroleum products and mechanical impurities, reducing time and increasing the cleaning depth of the incoming liquid.

This task is achieved by the fact that the proposed technology has a slope angle of 45 ° from the Y axis (the X surface is considered to be the earth's surface). The angle of inclination can be provided when drilling with units intended for inclined wells in the fields of high-viscosity, super-viscous and bituminous oils. The oblique design allows the surface (wall of the production string) to be present for the accumulation and enlarging of the oil droplets contained in the emulsion, thereby determining the greater efficiency of the installation as compared to the vertical CRP. This technical solution combines the functions of a pipe apparatus for the preliminary preparation of oil and a well pumping station for pumping a working object into the formation.

The device is illustrated graphically. FIG. Figure 1 shows the Inclined Pre-Water Borehole (NSHPSV).

NSHPSV has a production column (1), pipe insert (2), tubing layout (3), installation of an electric centrifugal pump with CFR (4), inclined gushing fittings (5), check valves (6, 7) and water meter (8) .

The principle of operation of the device for organizing the cluster discharge and disposal of formation water is as follows:

From a well or AGZU, a liquid with a water content of at least 90% enters the annular space of the tubing and the NSHPSV tube insert, after which the fluid moves towards the bottom of the well. Partially dehydrated oil emulsion, as well as liberated free gas, at the expense of lower density is sent to the annular space between the production casing and the tubular insert, after which it enters the collecting reservoir. Further, as the fluid flows from the lower part of the tube insert through the column, oil drops rise to the upper generator of the production column, as a result of which the drops merge and become larger, and due to the difference in density they rise up the inclined wall of the production column, combine with the partially dehydrated oil emulsion, and enter the collection manifold. Purified water in the lower part of the NShPSV is taken by an electric centrifugal pump, or under its own pressure enters the NShPSV shank, and is used to maintain reservoir pressure or absorption. Mechanical impurities contained in the passing water are the heaviest component of the incoming liquid flow in the NSHSV. Under the action of gravitational forces, mechanical impurities tend to the lower part of the device, and accumulate on the face of the NShPSV. In order to prevent the negative impact of mechanical impurities on submersible pumping equipment, the design of NShPSV implies ZUMPF. Consolidation of oil droplets will lead to an increase in the rate of their rise in the emulsion due to the difference in the densities of the phases.

In practice, this invention is implemented as follows:

A special drilling rig drills an inclined bore at an angle of 45 ° from the Y axis, into which the production casing descends and cements from the outside to the mouth, it is necessary to ensure its tightness, then the pipe insert goes down, after which the final stage of the construction of the NShPSV is to lower the shank or centrifugal pump from CFR on tubing. The capacity and head of the electric centrifugal pump are calculated depending on the required injection volumes and the estimated volumes of the separation of the associated water. If necessary (changing the working conditions), it is possible to replace the installation of an electric centrifugal pump with a pump of a different capacity with the help of special units for capital and underground well repair.

NShPSV due to the inclined production column allows you to provide a more stable quality of pre-treatment of oil separated by passing water, combining in one device the functions of a tubular apparatus of pre-treatment of oil and a well pumping station for pumping a working agent into the reservoir compared to other methods of organizing a cluster discharge of water. The use of NShPSV will reduce the building area, reduce construction time, construction and operation costs, when organizing a preliminary discharge on the well cluster, compared to other known methods of organizing a preliminary discharge of water on the well cluster. If necessary, there is the possibility of building several NShPSV to ensure high performance.

Thus, the set of signs of technology is new and allows for more efficient cluster discharge and utilization of produced water, in conditions of high reserves and an increase in the water content of the production in oil fields.

Claims (1)

The inclined pit of the preliminary discharge of produced water is characterized by the fact that it has a sloping harness of the Christmas tree, a production column drilled at an angle of 45 ° from the Y axis, a tubular insert and a shank, or an electrical centrifugal pump installed on the tubing to ensure the intake of purified reservoir water .

Images