The method of operation of water-oil deposits and device for its implementation

 

The invention relates to the oil industry and can be used in the operation of deep-pumping of wells in which the reservoir is divided into water-saturated and saturated intervals. Provides enhanced oil recovery reservoir. The inventive method includes perforating casing in oil and water bearing formation intervals, downhill tubing downhole pump so that it was above the productive formation and was connected with the column tail pipe, the lower end of which is lowered to the bottom, and the draining of the reservoir fluid. According to the invention, increase the speed of the oil in the cavity of the casing opposite the perforations in the oil-saturated interval of the formation. This is carried out due to channel narrowing passage of oil. To do this, at the end of the column tail pipes strengthen the device tip in the form of a streamlined fusiform body with a thickening in length, selected on the basis of the length of the oil-saturated interval of 2 s and 2 C.p. f-crystals, 3 ill.

The invention relates to the oil industry and can be used in oil-saturated interval.

There is a method of developing oil deposits and.with. 1719621 SU, E. 21 In 43/20, 15.03.92 [1], which involves continuous tracking of the position of the oil-water contact, isolation of the water and subsequent perforation of wells above the screen. However, for the oil fields in the later stages of development peculiar to the constant movement of oil-water contact (OWC) up that, due to the presence of the vertical permeability of the reservoir, causes pulling up to the top of the perforation holes of the water cone and the overlap of flow of oil from the oil-saturated part of the reservoir. This reduces the effectiveness of the method, which is also associated with significant costs, time-consuming isolation and re prostredie work.

It is also known the method further waterfowl oil deposits, according to which perforined as oil-saturated and water-saturated intervals of the reservoir, set the packer in the casing at the level of the oil-water contact in the process of production into water-saturated interval of the reservoir portion of the produced fluid from the oil-saturated interval of the formation. The injection of the specified portion of the liquid is C ongena oil recovery by that part of the produced oil is returned into the reservoir. Furthermore, the method is only feasible with pumping units with working bodies, reciprocating movement, for example, with sucker rod pumps (SRP system).

The known method of operation of flooded oil fields, is also suitable for the development of waterfowl oil deposits, according to which perforined casing in oil and water bearing intervals of the reservoir, installing a submersible pump with an attached column tail pipe and check valve on the end, and produce stratiform liquid by pumping, patent 2065026 EN, E 21 IN 43/00, 10.08.96 [3] is a prototype. This method allows you to select products from both oil and water bearing intervals without the formation of a water cone.

The disadvantage of this method is the reduced efficiency of oil recovery due to the fact that the bottomhole pressure for saturated and water-saturated intervals equally. Therefore, both water and oil are selected with the same intensity. At high water cut oil's share in raising the liquid is small.

A device for operation of water-oil to the specified pump from the bottom, and packer, two plunger and two valve [2]. The device provides a supply of part of the produced fluid in the saturated interval of the reservoir through the return stroke of the plunger pump.

The disadvantage of this device is the complexity that reduces its reliability. In addition, the specified device is operable only when using it in conjunction with a sucker rod pump having a plunger reciprocating movement.

It is also known a device for the exploitation of oil deposits, containing the tubing to pump deep and column tail pipe with a check valve on the end, attached to the specified pump lowered into the casing, a perforated both in oil and in water-saturated formation intervals [3] is a prototype.

The disadvantage of this device is that it is created using the same bottom-hole pressure for saturated and water-saturated intervals of the formation. This leads to the fact that as oil and water extracted from the reservoir with the same intensity. At high water it reduces the share of oil in the pumped liquid.

The task of the invention is to increase the efficiency of the method of operation of water-oil sanoi phase, i.e., enhanced oil recovery.

The problem is solved in that in the method of operation of water-oil deposits, including perforating casing in oil and water bearing formation intervals, downhill tubing downhole pump so that it was above the productive formation and was connected with the column tail pipe, the lower end of which is lowered to the bottom, and the draining of the reservoir fluid, increase the speed of the oil in the cavity of the casing opposite the perforations in the oil-saturated interval of the reservoir due to channel narrowing passage of oil, which at the end of the column tail pipes strengthen the tip in the form of a streamlined fusiform body with a thickening length, selected based on the length of the oil-saturated interval.

In the walls of the lower part of the column tail pipes carry out the holes for the extracted oil.

The problem is solved also by the fact that the device for operation waterfowl oil deposits containing the tubing to pump deep and column tail pipe attached to the specified pump lowered into the casing, a perforated as in oil-saturated and water-saturated iela with thickening length, selected based on the length of the oil-saturated interval, and the length of the column tail pipe to the specified thickening was located in the oil-saturated interval of the formation.

In the walls of the lower part of the column tail pipes with holes for extracted oil.

Increasing the speed of the movement of oil through the channel narrowing passage of oil, in accordance with a known law of Bernoulli, further reduces the pressure of the moving oil in place of constriction. This effect is widely used in a number of technical devices, such as the carburetor, jet pump, etc.,

In practice, the exploitation of oil deposits narrowing of the channel passage of oil is the easiest to implement due to the installation of the streamlined fusiform body with a thickening so that the specified thickening was located opposite the oil-saturated interval of the formation. This leads to the fact that in this area increases the speed of movement of the oil and, therefore, further reduces the bottomhole pressure. This increases the depression on the formation of oil-saturated interval and makes it more than depression in the saturated interval. Accordingly, this increases the removal of oil from the oil-saturated interval and powei waterfowl oil deposits were not found. Therefore, the inventive method and apparatus have the characteristics of novelty and inventive step.

The essence of the proposed method and device illustrated in Fig.1. In Fig.1: 1 - column casing;

2 - column tubing;

3 - pump;

4 - column tail pipes;

5 - tip in the form of a streamlined fusiform body;

6 - thickening;

7 - perforation of casing;

8 - oil-saturated interval;

9 - saturated interval;

10 - surface oil-water contact;

11 - hole in the lower part of the column tail pipes;

RnZab- downhole pressure in the oil-saturated interval of the reservoir;

RinZab- downhole pressure in the saturated interval of the formation.

In Fig.2, 3 shows a cross section of the device.

The method is carried out by operation of the device. Column casing 1 has a perforation 7, located both in oil and in water-saturated intervals 8 and 9, which are separated by the surface of the oil-water contact 10. Submersible pump 3 is lowered in the casing 1 on the tubing string 2. As the downhole pump may be used any known device, for example, sucker rod pump, electrical submersible pump (ESP), and what my fluid through the cavity of the column tail pipes, for example, when using bottom-hole in the lower part of column 4 with holes 11. To the lower end of the column 4 is attached to the handpiece in the form of a streamlined fusiform body 5 with a thickening 6. As the tail pipes can be used in any pipes, providing the necessary strength of attachment and the weight of which does not exceed the permissible load on the design of the submersible pumping unit, such as a pipe, tubing, hollow rod from the bottom-hole pump, pipes made of light alloys, etc., the Length of the casing 2 and the columns of the tail pipe 4 is chosen so that the thickening 6 was located opposite the perforation of oil-saturated interval 8.

When you enable the downhole pump 3 and the beginning of the pumping fluid pressure in the perforation 7 is reduced. This creates a depression on the layer and provides the inflow of reservoir fluid from both water-saturated and saturated intervals in the bottom of the casing string.

The produced reservoir fluid, such as water and oil, moves to the reception of the downhole pump 3 through the annular cavity between the casing 1 and the column tail pipes 4 (ESP) or through holes 11 and the cavity of the tail pipe 4 (mainly for SRPS). Thus, the reservoir fluid, dogomania from the area below the us is between thickening 6 of the body 5 and the wall of the casing 1 is substantially less than in other areas in the cavity of the casing 1, the velocity of a fluid in a channel increases dramatically compared to the speed of movement in the saturated interval. In accordance with the Bernoulli law, this leads to the fact that the fluid pressure PnZabin the field of oil-saturated interval additionally decreases and becomes less than the pressure PinZabin the saturated interval. This causes more depression on the oil-saturated interval of the reservoir and increases the flow of oil into the well at a constant amount of produced water.

Thus, the proposed method and device for its implementation allow to increase the intensity of extraction from the reservoir oil phase and thereby increase the share of oil in the produced reservoir fluid, i.e., to increase the recovery rate.

Sources of information

1. The way of the development of oil deposits. The description of the author's certificate 1719621 SU, E. 21 In 43/20. Publ. 15.03.92.

2. The method of oil production in the later stages of development and device for its implementation. Pat. 2175377 EN, E 21 IN 43/00, Publ. 27.10.01.

3. The method of extracting oil cut. Pat. 2065026 EN, E 21 IN 43/00, Publ. 10.08.96.

Formula izopet the oil and water bearing formation intervals, downhill tubing downhole pump so that it was above the productive formation and was connected with the column tail pipe, the lower end of which is lowered to the bottom, and the draining of the reservoir fluid, characterized in that to increase the speed of the oil in the cavity of the casing opposite the perforations in the oil-saturated interval of the reservoir due to channel narrowing passage of oil, which at the end of the column tail pipes strengthen the tip in the form of a streamlined fusiform body with a thickening in length, selected on the basis of the length of the oil-saturated interval.

2. The method according to p. 1, characterized in that the walls of the lower part of the column tail pipes carry out the holes for the extracted oil.

3. Device for operation of water-oil deposits containing the column tubing to pump deep and column tail pipe attached to the specified pump lowered into the casing, a perforated both in oil and in water-saturated intervals of the formation, wherein at the end of the column tail pipes reinforced tip in the form of a streamlined fusiform body with a thickening in length, selected from protyajennost in oil-saturated interval of the formation.

4. The device according to p. 3, characterized in that the walls of the lower part of the column tail pipes with holes for extracted oil.



 

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