RU164188U1 - INSTALLATION FOR PRELIMINARY DRAINAGE OF OIL ON UNDEMANDED WELLS - Google Patents

Abstract

Installation for preliminary dehydration of oil in undeveloped wells, including a rod unit with two pumps connected in series, hollow rod columns for pumping water and tubing for pumping oil, a liner lowered below the perforation interval, an inclined pipe on the surface for separating oil and water characterized in that a pipe of smaller diameter is concentrically placed inside the inclined pipe, the upper part of which is connected to the column of hollow rods, and the lower part of the outer pipe oedinena with a column of tubing, both the input well fluids made at distances from the ends of the outer tube, its length equal to 1/3, and in the end portions of the outer tube formed upper outlet for the dehydrated oil from the gas and a lower outlet for water.

Description

Installation for pre-dehydration of oil in undeveloped wells

The utility model relates to the oil industry and can be used for preliminary preparation of production of undeveloped wells. It is known that water flooding leads to the formation of persistent oil-water emulsions in underground equipment of producing wells. The rise of waterlogged products along the tubing string is accompanied by its dispersion by sucker rods and the formation of stable emulsions, the destruction of which at the oil treatment points is associated with high costs of demulsifiers and electricity.

Production of water-logged oil in undeveloped wells is associated with the absence of oil dehydration conditions similar to centralized oil treatment facilities. At the same time, the transportation of the extracted products of such wells by road requires deep dehydration of oil directly at sites near the mouth of these wells.

Known sucker rod pumping unit for simultaneous and separate oil production from two layers, which allows, in the absence of a packer, to separately extract oil and water from a waterlogged well and prevent their mixing / 1 /.

It contains two pumps of different diameters, interconnected by a pipe, a side suction valve of the upper pump, a column of hollow rods, a packer, uncoupling layers. The plunger of the upper pump hermetically contains a cylinder inside, the upper cavity of which is connected to the column of hollow rods, and the lower one to the pipe, two through horizontal channels are located inside the cylinder on both sides of the plunger, interconnected by a vertical cylinder channel, inside which there is a discharge valve of the upper plunger .

The installation has the disadvantage that some of the water-oil mixture is emulsified in the well. This is due to the fact that the pump design provides for strictly defined ratios of oil and water pumping volumes. The ratios of the volumes of oil and water in the extracted products to one degree or another differ from them.

It is known that for the destruction of the emulsion and the separation of formation fluid on the surface, a pipe water separator / 2 / is used, containing a manifold for supplying an oil-water mixture connected to an inclined pipeline, in parallel with which there is a gas discharge pipeline, pipelines for water discharge and oil discharge. The installation is equipped with a flow damper located at the junction of the gas-oil mixture supply manifold with the inclined pipeline, and the gas exhaust pipeline is located above the inclined pipeline and connected to it by jumpers.

However, they have a large metal consumption and do not allow separate preparation of oil and water, due to their joint movement along the axis of the pipe.

The closest in technical essence to the proposed installation is a pipe installation for water discharge / 3 /, which contains inclined oil and water sections made of separate pipes, plugged from both ends, pipelines for supplying the oil-water mixture and drainage of oil and water. The pipeline for supplying the oil-water mixture is connected to the separation unit of the preliminary division, made in the form of a horizontal pipe plugged from both ends. The separation unit of the preliminary division is connected by an oil discharge pipe to the oil section and a water discharge pipe to the water section. Oil and water sections are inclined pipelines. The branch pipe of the oil drainage of the separation unit of the preliminary division is connected to the lower part of the oil section, the branch pipe of the water drain is connected to the upper part of the water section.

The disadvantages of this installation are the large overall dimensions and low quality of the preliminary preparation of oil.

The technical objective of the proposed installation is to improve the quality of separation of oil and water.

The problem is solved in that in the known installation for preliminary dehydration of oil in undeveloped wells, including a rod unit with two pumps connected in series, hollow rod columns for pumping water and tubing for pumping oil, a shank lowered below the perforation interval, an inclined pipe According to a utility model, on the day surface for oil and water separation, a pipe of smaller diameter is concentrically placed inside the inclined pipe, the upper part of which is connected with a column of hollow rods, and the lower part of the outer pipe is connected to the column of tubing, and both inputs of well fluids are made at distances from the ends of the outer pipe equal to 1/3 of its length, and on the end parts of the outer pipe there is an upper branch for dehydrated oil with gas and lower water outlet.

The technical result of the installation is to improve the quality of the separation of oil and water.

The figure shows a diagram of the proposed installation.

A polished hollow rod 1 at the wellhead is connected to a string of hollow rods 2, lowered into the tubing 3. The rods are connected to a plunger 4 of the upper pump having a discharge valve 5 in the inner cylindrical channel and a side suction valve 6. The cylinder 7 of the upper pump is connected to cylinder 8 of the lower pump having a plunger 9, a discharge 10 and a suction valve 11. A polished hollow rod 1 at the mouth is connected to a flexible high-pressure sleeve 12, and the pipe string 3 is connected with a shut-off valve 13. The lower pump is connected to a liner 14 deflated below the perforation interval of the well.

The upper equipment of the pre-dewatering unit is a tank consisting of two inclined, concentrically arranged pipes. The outer pipe 15 has inlet and outlet nozzles for oil, water and gas. The inner pipe 16 has open ends, with one of the ends located in the upper part of the outer pipe with its output through the body of the outer pipe to 1/3 of its part. The other (lower) end of the inner pipe does not reach the lower end of the outer pipe by a length equal to 1/3 of the length of the outer pipe. Along the upper generatrix of the inner tube there are slotted perforation channels.

The operation of the installation is as follows. In the well, the products of the formation are stratified into oil and water. Usually, in the area from the bottom to the intake of the pump, there is a column of water in which the oil phase floats in separate drops. Therefore, the aqueous phase will enter the shank 14 of the installation, and the oil phase with a certain amount of water will enter the intake of the upper pump. Next, the water will be pumped by the lower pump through the concentric cavity of the upper plunger into the column of hollow rods, and the oil phase through the valves 6 and 5 will enter the pipe string 3 and pump out to the surface through the valve 13.

Further, oil with water and gas inclusions through the flow line enters the lower part of the outer pipe 15, located at a distance of about 1/3 of its length. Along the way, produced water with oil and gas inclusions enters the upper part of the inner pipe 16, with a tie-in point located 1/3 of the length of the outer pipe from its upper plug. Lighter in density oil moves towards the top of the outer inclined pipe, and water, heavier in density, moves towards the bottom of the outer inclined pipe. As it moves, oil is purified from water and gas inclusions, and water from oil and gas inclusions due to the difference in densities and coalescence processes. Water entering the inner pipe moves down and accumulates in the lower part of the outer pipe. Oil, while floating up, moves along the upper generatrix of the inner pipe and through slotted perforation channels reaches the upper generatrix of the outer pipe. Oil and water accumulate in the upper and, accordingly, in the lower part of the outer pipe and, as they accumulate, are discharged into specially equipped containers for accumulation and subsequent transportation.

The technical and economic advantage of the installation is to ensure deep oil dehydration.

Literature.

1. RF patent No. 2430270. A sucker rod pump unit for simultaneous and separate oil production from two layers. Claim October 27, 2009. Published. 10/27/2011.

2. RF patent No. 2098166 of the Russian Federation, MKI V01D 19/00. Water discharge unit 08/10/1993. Publ. 12/10/1997.

3. RF patent No. 2302279 of the Russian Federation, MKI B01D 17/00. Pipe installation for water discharge. Claim 09/19/2005. Publ. 07/10/2007.

Claims (1)

Installation for preliminary dehydration of oil in undeveloped wells, including a rod unit with two pumps connected in series, hollow rod columns for pumping water and tubing for pumping oil, a liner lowered below the perforation interval, an inclined pipe on the surface for separating oil and water characterized in that a pipe of smaller diameter is concentrically placed inside the inclined pipe, the upper part of which is connected to the column of hollow rods, and the lower part of the outer pipe oedinena with a column of tubing, both the input well fluids made at distances from the ends of the outer tube, its length equal to 1/3, and in the end portions of the outer tube formed upper outlet for the dehydrated oil from the gas and a lower outlet for water.

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