Device for regulation of water cone in well

FIELD: oil and gas industry.

SUBSTANCE: device contains a pump launched into casing string at pipe string with shank end underneath and connected to connecting tube; in the well there are two delivery channels, at that one channel is for oil delivery while the other one is for water delivery from stratum to the well. Channel inputs are located at different levels while outputs are directed to pump suction side. Shank end is equipped from outside with packer installed in casing string at the level of water-oil contact and radial holes of shank end are located higher than packer. At that below radial holes a hollow blind plug is inserted into shank end; connecting tube is inserted into the plug, at that tube can be moved along axis and fixed. However fixation of connecting tube in regard to shank end is made by split locking ring of circular section which is installed in inner groove of the hollow blind plug; this ring fixes the connecting tube in semicircular notches at outside surface of the tube. At that channel for oil delivery is formed by inner space of the casing string upwards packer, radial holes of the shank end and space between the shank end and connecting tube. Channel for water delivery is formed by inner space of the casing string downwards packer and inner space of the connecting tube. Inputs of both channels are located opposite perforated holes in water- and oil-bearing parts of stratum while outputs are directed to pump suction. Due to regulation of water and oil extraction the suggested device also allows preventing mixing of water and oil in process of their raising in the pipe string and producing of product that does not require subsequent separation into different phases; it also allows reducing probability of water-oil emulsion and paraffin deposition in result of fast transfer from water extraction to oil extraction.

EFFECT: ability of water and oil extraction regulation when level of water-oil contact changes in the well during operation process, producing product that does not require subsequent separation into different phases and probability of water-oil emulsion and paraffin deposition at inner surface of pipes.

3 dwg

 

The invention relates to the field of the oil industry, in particular to the means of lifting fluid from a well.

A device for implementing the method of regulation of the water cone in oil production in the conditions of two-phase filtration (I.I. kleschenko, RU Kuznetsov, YU.V. the Sukhachev. Izvestiya vuzov, Oil and gas, 1998, No. 6, p.21-26.), consisting of a mechanical valve that connects the internal cavity of the tubing alternately with the cavity of the casing above or below the mounting location of the packer.

The disadvantage of this device is non-automatic operation of the regulating valve and the need to reorient the working bodies of the valve when the cut reaches a predetermined percentage, and when the oil in the extracted aqueous phase.

Known input device of the downhole pump (patent RU №1782294, IPC 8 F04D 13/12, publ. 15.12.1992,, bull. No. 46) for regulating cone of water in the well, allowing you to control the cone of water in the well, containing two inlet, the inlets of which are located at different levels, and the outputs are connected through a connecting device on the opposite side to the receiving nozzle of the pump. The intake pipe of the pump is connected to the upper U-shaped section connecting tube.

The disadvantages of this device t is Auda:

firstly, the products raised by the pump from the well to the surface requires further separation into separate phases;

- secondly, the high probability of formation of oil-water emulsions and the deposition of paraffin in the well that is due to the long transition from pumping water for oil;

- thirdly, low oil recovery from reservoirs with bottom water.

The closest in technical essence and the achieved result is the input device of the downhole pump (patent RU №2123613, IPC F04B 47/00, F04D 13/12, publ. 20.12.1998., bull. No. 35) for regulating cone of water in the well containing the pump is lowered on the column lift pipes in an oil well where the oil and water flowing into the well from the reservoir to the pump from the bottom is connected to the shank in the form of a pipe, the lower end of which is connected with a connecting tube to the settlement from its bottom a distance, and two inlet, the inlets of which are located at different levels, and their outputs are connected to the connecting tube, it is provided with an additional channel connected to the connecting tube of the inlet pipes.

The disadvantages of this device are:

- first, low efficiency, related to the fact that during operation of the device when the reservoir with bottom water level of the water to the beat (KSS) is constantly changing (rising or falling), and the device has no way of regulating the volume of oil extraction and water, so there is a mixing of oil and water pump intake;

- secondly, in consequence of the fact that the process is not taken into account changes in the level KSS products raised by the pump from the well to the surface requires further separation into separate phases;

- thirdly, the long duration of the transition from pumping water in the oil, therefore, a high probability of formation of oil-water emulsions and the deposition of paraffin in the well.

The technical task of the invention is to provide a device that allows you to adjust the volume of the selection of oil and water when changing the level of the oil-water contact (OWC) in the well in the process, as well as getting on the surface of the wells of products not requiring subsequent separation into separate phases and reduce the likelihood of formation of oil-water emulsions and paraffin deposits on the inner surface of the pipe.

The problem is solved by a device for adjusting the cone of water in the well containing the pump is lowered into the casing of the well on the string of pipe to bottom shank connected with the connecting tube, and placed in the well two of the inlet channel, and one channel for the supply of oil, another channel for the supply of water to the well and the reservoir, the channel inputs are located on different levels, and the outputs are sent to the pump intake.

What's new is that the liner pipe string provided outside the packer set in the well casing string at the level of the oil-water contact and radial holes above the packer, and the shank below the radial holes rigidly mounted a hollow plug which is sealed with the possibility of axial movement and fixation installed connecting tube, and the fixing of the connecting tube relative to the shank by using a split retainer ring is mounted in an internal groove of the hollow plugs and fixing the connecting tube in the semicircular notches made on the outer surface of the connecting tube, and the channel for the supply of oil is formed, the inner space of the casing above the packer, the radial holes of the shank and the space between the shank and the connecting tube, and a channel for the supply of water formed by the internal space of the casing below the packer and the inner space of the connecting tube, and the inputs of both channels are located opposite the perforations in aquifers and oil-bearing parts of the layer, and the outputs are sent to the pump intake.

In figures 1-3 shows the diagram before aguinaga device.

Device for regulating cone of water in the well includes a pump 1 (see figure 1), are lowered in the casing 2 wells on the string of pipe 3 and a shank 4 from below.

Also the device has placed in the well two of the inlet channel 5 and 6. Channel 5 is intended for the supply of oil, and the other channel 6 is designed to supply water to the pump intake 1 flowing into the well from the reservoir 7.

The shank 4 of the column pipe 3 provided outside the packer 8, installed in the casing 2 wells at the level of the oil-water contact (OWC) 9 and the radial holes 10 above the packer 8. The shank 4 is lower radial holes 10 is rigidly mounted a hollow cap 11, which is sealed with the possibility of axial movement and fixation installed connecting tube 12.

Fixation of the connecting tube 12 (see Fig 1 and 2) relative to the shank 4 is carried out using a split retaining ring 13 of circular cross section mounted in an internal groove 14 of the hollow stub 11 and the locking of the connecting tube 12 in the semicircular notches 15, performed on the outer surface of the connecting tube 12.

Channel 5 (see figure 1) for the supply of oil is formed, the inner space 16 of the casing 2 above the packer 8, the radial holes 10 of the shank 4 and the space 17 between the shank 4 and the connecting tube 12 above the packer who 8.

Channel 6 for the supply of water formed by the internal space 18 of the casing 2 below the packer 8 and the inner space 19 of the connecting tube 12.

The inputs of both channels 5 and 6 are located opposite the top 20 and bottom 21 of punching holes in aquifers and oil reservoir sections 7, respectively, and the outputs are sent to the pump intake 1.

The operation of the device is as follows.

The equipment as shown in figure 1 are lowered into the well, filled with process fluid (water). Level 9 KSS horizontal.

First pump 1 (see figure 1), such as downhole sucker rod pump brand NCW-32 extracts the string of pipe 3 water from a well. The oil thus flows through the upper perforations 20 and accumulates in the inner space 16 between the shaft 4 and the casing 2. To get an appointment 22 pump 1 oil does not allow the difference between the hydrostatic pressure in the inner space 16 and the space 17 of the channel 6.

Water is supplied to the intake 22 of the pump 1 from the water-bearing part of the reservoir 7 through the lower perforations 21 and then channel 6 for the supply of water formed by the inner space 18 of the casing 2 below the packer 8 and the inner space 19 of the connecting tube 12, where it hits a reception 22 of 1st pump which pumps the water through the string of pipe 3 at the mouth of the wells is determined.

Cone water (figure 1-3 not shown), is omitted, and when he reaches the bottom of outlet openings 21, through the channel 6 through the inner space of the connecting tube 12 will begin to enter the oil together with water. The density of the fluid in the inner space 19 of the connecting tube 12 becomes less than the density of water in the space 17 and the water flowing through the internal space 19 of the connecting tube 12 in podvecerni space 18 of the well.

Starts the flow of oil through the upper perforations 20, and channel 5, i.e. in the inner space 16 of the casing 2 above the packer 8, the radial holes 10 of the shank 4 and the space 17 is supplied to the intake of the pump 1, which pumps the oil through the tubing string 3 at the wellhead.

Cone water rises, and the flow of oil through the lower perforations 21 is stopped. Water fills the inner space 18 of the casing 2 below the packer 8 and the inner space 19 of the connecting tube 12, however, may not apply for admission 22 pump 2 due to the difference in hydrostatic pressure in the inner space 19 of the connecting tube 12 and into the inner space 16 between the shaft 4 and the casing 2.

Pumping oil pump 1 through the tubing string 3 at the wellhead from the upper perforations 20 of the reservoir about algaesia until while the cone of water will not rise to the top perforations 20. The density of the fluid in the inner space 16 and the space 17 of the channel 6 is increased, starts the flow of water from the lower perforations 21 in the inner space 19 of the connecting tube 12.

The oil thus flows from the space 17 in the inner space 16 of the channel 6 and begins pumping water, which flows through the interior space 19 of the connecting tube 12 to receive a pump 2 which pumps the water through the tubing string 1 at the wellhead. Then the cycle repeats.

In the process of development of the reservoir 6 with bottom water level KSS 9 is changed (raised or lowered), so to increase the efficiency of the device to avoid mixing oil and water pump intake produce regulation volume selection of oil and water. The increase in water samples indicates the increase of the level cap 9, and Vice versa, reducing the amount of water abstraction indicates a lower level KSS 9.

In order to reduce the amount of extracted water and to increase the selection of oil, i.e. to reduce the level of KSS 9 must raise the connecting tube 12. This is extracted from the tubing 3, the plunger 23 of the pump 1 with a column of the rod 24 (see Fig 1) and using any known device, for example by using the safety device 25 or the known construction, lowered into the string of pipe 3 (see figure 3) on the rope 26 produce internal capture connecting tube 12 (see figure 3) and carry out an axial movement upwards, for example, 2.5 m Retaining ring 13 (see figure 2 and 3) fixes the connecting tube 12 relative to the shank 4 in the upper position. Next, release the safety device 25 from engagement with the connecting tube 12 and produce removing the safety device 25 with the rope 26 of the tubing 3. Descend into the string of pipe 3, the plunger 23 of the pump 1 with a column of the rod 24 (see Fig 1) and start the pump 1 in operation, the cycles of operation of the device are repeated as described above. In the result, the volume of sampled water begins to decrease and the selection of the volume of oil to increase the level cap 9 is reduced.

In order to increase the amount of extracted water and reduce the volume of oil extraction it is necessary to omit the connecting tube 12. This is extracted from the tubing 3, the plunger 23 of the pump 1 with a column of the rod 24 (see Fig 1) and using any known device, such as a load (figure 1, 2, 3. not shown), consisting of two or three pipes, external diameter larger than the diameter of the connecting tube 12 5-10 mm lowered into the string of pipe 3 (see figure 3) produce unloading of cargo on the funnel 25 connecting tube 12. In the connecting tube 12 is lowered down to, for example, 2 m (figure 1, 2, 3 not shown). The lock to LCA 13 (see figure 1 and 2) captures the connecting tube 12 relative to the shank 4 in the down position (figure 1, 2, 3 not shown).

Next make removing cargo from a rope from the pipe string 3. Descend into the string of pipe 3, the plunger 23 of the pump 1 with a column of the rod 24 (see Fig 1) and start the pump 1 in operation, the cycles of operation of the device are repeated as described above.

In the result, the volume of sampled water begins to increase, and the selection of the volume of oil to decrease the level cap 9 is increased.

The proposed device allows you to adjust the cone of water in the well by changing levels of water abstraction and oil depending on the level of the oil-water contact, which increases the efficiency of its work.

Also, the proposed device for regulating the volume of water withdrawal and oil prevents their mixing in the process of lifting the string of pipe and get on the surface of the well production, not requiring subsequent separation into separate phases, and also reduces the likelihood of formation of oil-water emulsions and the deposition of paraffin because of the rapid transition from water withdrawal for oil extraction.

Device for regulating cone of water in the well containing the pump is lowered into the casing of the well on the string of pipe to bottom shank connected with the connecting tube, and placed in the well is E. two of the inlet channel, one channel is for the supply of oil, and another channel for the supply of water, with the possibility of entering into the well from the reservoir, the channel inputs are located on different levels, and the outputs are sent to the pump intake, characterized in that the shank of the pipe string provided outside the packer set in the well casing string at the level of the oil-water contact, and radial holes above the packer, and the shank below the radial holes rigidly mounted a hollow plug which is sealed with the possibility of axial movement and fixation installed connecting tube, and the fixing of the connecting tube relative to the shank carried out using split the locking ring is mounted in an internal groove of the hollow plugs and fixing the connecting tube in the semicircular notches made on the outer surface of the connecting tube, and the channel for the supply of oil is formed by the internal space of the casing above the packer, the radial holes of the shank and the space between the shank and the connecting tube, and a channel for the supply of water formed by the internal space of the casing below the packer and the inner space of the connecting tube, and the inputs of both channels are located opposite the perforating overstim aquifer and the oil reservoir sections, and the outputs are sent to the pump intake.



 

Same patents:

FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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2 cl, 6 ex, 1 tbl

FIELD: oil extractive industry.

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3 cl, 1 dwg

FIELD: oil and gas industry.

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6 cl, 1 ex

FIELD: oil and gas production.

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1 tbl

FIELD: oil and gas industry.

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FIELD: mining industry.

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EFFECT: higher efficiency.

4 cl, 10 dwg

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