CN2307102Y - Downhole Oil-Water Separation Water Injection Production Device - Google Patents

Abstract

The downhole pump type oil-water separation and water injection production device is composed of surface motor, downhole first-stage pump, second-stage pump, swirl type oil-water separator, flexible shaft and water injection pipeline, etc. It is mainly pumped from the suction port through the first-stage pump The oil-water mixture from the oil layer is sucked into the pump, the liquid flow is pressurized and then enters the hydrocyclone oil-gas separator, and then the water separated from the separator enters another water injection layer through the water injection pipeline, and the separated oil is passed through a special The channel enters the stage II pump, which is boosted and lifted to the surface. Thereby, the energy consumption of oil recovery and water injection is greatly reduced, and the cost of oil recovery is reduced.

Description

Downhole Oil-Water Separation Water Injection Production Device

The utility model relates to a new type of downhole oil-water separation type water injection oil production device, which belongs to the improvement of the mining equipment in petroleum engineering. It mainly drives the second-stage pump and the first-stage pump of the downhole oil pipe by using a ground motor, and in the The lower end of the stage I pump is equipped with a cyclone oil-water separator, so that the separated water is reinjected into the formation, and the separated oil is pumped to the ground through a special oil pipeline through stage II, thus saving a lot of energy. It is mainly composed of ground motor, class II pump, flexible shaft, class I pump and oil-water separator and other components.

In the process of oil extraction, the self-flowing time of the oil well only accounts for a small part of the entire extraction process. When self-spraying is not possible due to the reduction of reservoir pressure, artificial lift is required for oil recovery. Formation pressure continues to decline as the well enters later stages of development. When the formation pressure is not enough to drive the oil into the wellbore, it is necessary to use the method of water injection pressurization for oil displacement. In this way, a large amount of water is contained in the lifted liquid, sometimes as high as more than 90%. In order to increase the production of oil wells, the usual practice is to use a large displacement pump to pump oil, and at the same time lift a large amount of water contained in the oil to the surface; Extraction requires the reinjection of purified water into the oil reservoir at the surface. Such a reciprocating cycle has caused a large amount of energy waste, which greatly increases the mining cost. Although the Chinese patent (application number 96244432.4) relates to a separate injection-production device using a two-stage pump in the oil pipe, the motor driven by it is arranged in the middle of the two pumps, which makes its structure relatively complicated, requiring manufacturing and Installation is also relatively difficult.

The purpose of this utility model is to avoid the deficiencies of the prior art and provide a new type of downhole oil-water separation water injection oil production device, which can not only effectively inject the water in the formation into the target formation, but also through the swirling flow The swirl action of the filter sends the oil back to the surface. The downhole pump type oil-water separation water injection oil production device is mainly composed of surface motors, class II pumps, class I pumps, flexible shafts, cyclone oil-water separators, water injection pipelines, oil pipes and oil rods and other components. Its main technology The characteristic is that the second-stage pump, the flexible shaft, the first-stage pump, and the cyclone oil-water separator are arranged in series in the oil pipe, the ground motor drives the second-stage pump through the oil rod, and the second-stage pump is connected with the first-stage pump through the flexible shaft. The fluid channel at the upper end of the oil-water separator is set at the outlet of the first-stage pump, and the outlet of the water injection pipe is set at the lower end of the oil pipe and communicated with the casing.

Accompanying drawing is the structural representation of the utility model.

The descriptions of the attached drawings are as follows: 1-oil rod 2-stage II pump 3-flexible shaft 4-stage I pump 5-oil-water separator 6-water injection pipe 7-water injection formation 8-packer 9-fluid channel 10 -Oil layer 11-casing liquid hole 12-oil pipe liquid hole 13-oil discharge pipe 14-oil pipe 15-casing 16-reduction gear 17-ground motor

In order to better realize the above-mentioned purpose of the utility model, the designer of the utility model also designed the first-stage pump and the second-stage pump to be both screw pumps and centrifugal pumps.

The structural features and working principle of the utility model will be described in detail below in conjunction with the accompanying drawings and embodiments.

In actual design and implementation, the designer uses the screw pump for the first-stage pump and the second-stage pump, and puts the oil pipe 14 and the device into the downhole to the production oil layer 10 with workover equipment. The annular space between the oil pipe 14 and the oil layer casing 15 is sealed with a packer 8 to prevent the liquid from going back. The ground equipment and the downhole unit are connected with the sucker rod 1, and the I and II stage screw pumps 4 and 2 of the downhole unit are connected by a flexible shaft 3. In this way, when the motor on the ground is started, after deceleration, the sucker rod 1 drives the I and II stage screw pumps 4 and 2 to run, and at the same time, the oil-water mixture from the oil layer 10 flows from the casing fluid hole 11 and the casing 15 on the casing 15. The oil pipe liquid hole 12 on the oil pipe 14 enters the suction port of the first-stage screw pump 4, and the first-stage screw pump 4 sucks the oil-water mixed liquid, and enters the cyclone oil-water separator 5 through the discharge fluid channel 9 after pressurization. The water separated from the separator enters another water injection layer 7 through the water injection pipeline 6 to inject water and drive oil for other oil wells. The oil separated from the separator (and part of the incompletely separated water) enters the II-stage screw pump 2 through the oil discharge pipe 13 and is lifted to the ground after being pressurized. In this way, when working, the motor on the ground decelerates to drive the I-stage and II-stage screw pumps to work through the oil rod. The first-stage screw pump sucks the oil-water mixture from the oil layer into the pump from the suction port, pressurizes the liquid flow, and then enters the hydrocyclone oil-gas separator located below the pump. The water separated from the separator enters the water injection layer through the water injection pipeline located below the separator; the oil separated from the separator (and part of the incompletely separated water) passes through the screw pump installed between the first and second stages. The oil discharge pipe enters into the second-stage screw pump, and is lifted to the ground after being pressurized. In this way, the energy of lifting 90% water from the downhole to the ground and the energy of hydraulic loss along the way of reinjection water are saved, thereby greatly reducing the energy consumption of oil production and water injection, and reducing the cost of oil production.

Claims (3)

1. down-hole pump formula water-oil separating water flood recovery device, it is made of ground motor (17), I level pump (4), II level pump (2), flexible axle (3), spiral-flow type oil water separator (5), filling pipe (6), oil pipe (14) and beam hanger (1), it is characterized in that II level pump (2), flexible axle (3), I level pump (4), spiral-flow type oil water separator (5) in series are arranged in the oil pipe (14) successively, ground surface motor (17) drives II level pump (2) by beam hanger (1), and II level pump (2) links to each other with I level pump (4) by flexible axle (3) and drives its rotation; The upper end of oil water separator (5) then is arranged on the exit of I level pump (2), and the outlet of its water injection pipe (6) is arranged on the lower end of oil pipe (14), and is connected with sleeve pipe (15).

2. down-hole pump formula water-oil separating water flood recovery device according to claim 1 is characterized in that described II level pump (4) and I level pump (2) can be screw pumps.

3. down-hole pump formula water-oil separating water flood recovery device according to claim 1 is characterized in that described II level pump (4) and I level pump (2) can be centrifugal pumps.

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