Plant for dual operation of two beds

FIELD: engines and pumps.

SUBSTANCE: invention is related to oil industry and may find application in oil production from two beds of single well. The plant includes sucker-rod pump with plunger, cylinder, suction and pressure valves. Cylinder is equipped with side valve with filter. Auxiliary cylinder with side holes is fixed in cylinder, as well as jacket with provision of annular space between auxiliary cylinder and annular space jacket. Lower end of cylinder is plugged with plug. Suction valve, filter and tail with packer at the end are fixed on jacket. Plunger is arranged as combined, consisting of upper and lower plungers connected with stem with valves, with installation of upper plunger inside cylinder and lower plunger inside auxiliary cylinder. Lower plunger and stem have channel for communication of space above and under lower plunger. Upper plunger and stem have channel for space connection under upper plunger with inlet to upper plunger valve.

EFFECT: provision of serviceability at any values of pressure in operated beds and possibility to operate only one of beds.

3 dwg

 

The invention relates to the oil industry and can find application in the extraction of oil from two layers of one well.

Known pump installation for separate operation of several layers, which includes a column of lift pipes, pump rod, the retainer and the shank. Pump rod is provided with an additional suction valve located on the side wall of the cylinder that divides the cylinder along the length into two parts, proportional to the capacity of the reservoirs. The facility provides the opportunity to enter the pump cylinder during the movement of the plunger up first production of low-pressure reservoir, and after passing the additional plunger valve products high-pressure reservoir (RF Patent No. 2221136, published. 2004.01.10).

The disadvantage is the complexity of the separation cylinder, depending on the performance of layers and practical inefficiency in the changing rate of at least one of the layers, which in practice often occurs.

Closest to the proposed invention the technical essence is oil well pumping installation comprising a pump rod with the plunger, cylinder, suction and discharge valves, pipe positioned concentric with the pump cylinder and forming with him a sealed chamber, with the Windows of the mi in the upper part of the flow of fluid in mudplugger region of the pump, with the thread allocator with an additional valve and the through channels (RF patent No. 2293215, published. 2007.02.10 - prototype).

The installation allows to sample fluid from two layers with different pressures. However, the installation has the following disadvantages:

the dependence of plant operation from the differential pressure operated reservoirs. At small values of the pressure difference of the exploited layers of the installation becomes impossible;

- not the actual selected flow rate of each layer is calculated, thus, it is difficult to prescribe the optimal flow rate of each layer according to the modes of development of deposits;

- required preliminary research to determine the water cut of each layer. The possibility of direct determination of the water content is missing;

the inability to operate in wells, complicated asphalt-resin-paraffin deposits (ARPD);

- has a limitation on the viscosity of the selected fluid to 0.025 PAs);

the dependence of the structure of the pump from the bottom-hole pressure operated layers (depending on the magnitude of the pressure applied one or the other pump design);

- there is no possibility of operating only one of the reservoirs, fully isolating the other.

In the proposed invention solves the problem of ensuring robotops is the competitiveness in all pressure values of the exploited layers, the performance of the pump in accordance with the flow rates of the layers, enabling the operation of only one of the reservoirs, fully isolating the other.

The task is solved in that the apparatus for dual operation of two reservoirs, including rod pump plunger, cylinder, suction and discharge valves, according to the invention the cylinder is provided with a lateral valve with filter, fixed on the cylinder of the auxiliary cylinder with the side hole and the casing to form between the auxiliary cylinder and the casing annular space, the lower end of the cylinder is plugged by a plug, the casing is secured a suction valve, a filter and a shank with a packer on the end, the plunger is made combined, consisting of United stock upper and lower plunger valve, placing the top of the plunger within the cylinder and the bottom plunger inside the auxiliary cylinder, the lower plunger and rod have a channel for communicating the space above and below the lower plunger, the upper plunger and rod have a channel for connecting the space below the upper plunger to the entrance of the upper valve plunger.

The invention

Installation for dual operation of two reservoirs are presented in figures 1, 2 and 3.

The installation consists of a cylinder 1, provided with Boaventura 2 filter 3, on which with the help of adapter 4 attached auxiliary cylinder 5 through the clutch 6 of the casing 7 with the formation of the annular space 8 between the auxiliary cylinder 5 and the casing 7. The auxiliary cylinder 5 has a lateral opening 9. The lower end of the auxiliary cylinder 5 is plugged by a plug 10. On the cover 7 with the adapter 11 is fixed suction valve 12, the filter 13 through the clutch 14 of the shank 15. At the end of the shank 15 is fixed to the packer 16, which separates the upper layer I from the bottom of the reservoir II. Inside the cylinder 1 is placed the upper plunger 17, provided with a discharge valve 18, and inside the auxiliary cylinder 5 is placed lower plunger 19 having a channel 20. Plunger 17 and 19 rigidly interconnected by a rod 21, forming a complex combination plunger, which is driven by means of rods 22 connected with the machine-rocking chair (not shown). The rod 21 has on both sides of the openings of the reservoir fluid 23 and 24, respectively. Installation lowered into the production casing of the well 25 on the column tubing 26 and connected with the last clutch 27.

The device operates as follows.

The installation is placed in the hole 25 in the tubing pipe 26 so that the packer 16 provides a complete isolation of the two exploited layers I and II.

In position, when the pass side valve 2 is closed by the body of the plunger 17, provides an overlap of layer I. In the course of the column bars 22 and the associated plunger 17 and plunger 19 opens up the valve 12 is closed, the valve 18. The reservoir fluid from the reservoir II passes through the shaft 15, through the filter 13, the valve 12, the annular space 8, through the side opening 9, fills the space under the plunger 17, passes through the hole 23, the channel 20 and enters the space under the plunger 19. The cap 10 in the auxiliary cylinder 5 is required for isolation of the space under the plunger 19 from the liquid in the annular space 8. Until and overlap the plunger 19 of the side holes 9, the reservoir fluid is drawn only from the reservoir II. When reaching and closing the plunger 19 of the side holes 9 fluid from the reservoir II ceases to flow into the device. The pass side valve 2, an indoor previously plunger 17 opens. The reservoir fluid from the reservoir I, purifying himself in the filter 3 and opening valve 2, enters the space under the plunger 17 and through the opening 23 and the channel 20 in the space under the plunger 19. The selection of fluid from the reservoir I thus occurs before reaching the upper limit of the stroke of the combined plunger.

During the course of the combined plunger down valves 2 and 12 are closed and valve 18 is opened. The liquid accumulated in the space under the plunger 17 and 19, through the channel 20, the holes 23 and 24 is Yasnaya in the cavity of the tubing 26. Then the cycle repeats.

Thus, during one cycle of the sampling fluid occurs first from the reservoir II isolated from layer I, then from the reservoir I in isolation from the reservoir II. The selection is in complete isolation of the two layers from each other, ensuring the independence of the selection of the liquid regardless of the pressure of the layers I and II.

The installation may also work in the other two modes (see figure 2, 3).

When the reciprocating motion of the combined plunger in the interval a-b (2) only the lower reservoir II. The pass side valve 2 is closed by the body of the plunger 17, providing an overlap of layer I. In the course of the combined plunger up from a to b, the reservoir fluid is sucked through the valve 12 through the annular space 8 and the side holes 9, and fills the space under the plungers 17 and 19. During the course of the combined plunger down from position b to position and accumulated in the cavities of the installation, the reservoir fluid is pumped through the valve 18 in the tubing 26.

When the reciprocating motion of the combined plunger in the interval in (3) side valve 2 is opened, and the side holes 9 in the auxiliary cylinder 5 is closed by the plunger 19. Therefore the selection of the production well occurs only through the side valve 2 from the reservoir I. From the reservoir II selection of products does not occur.

Opportunities for the installation to work in these modes allow you to explore each operated stratum separately (to determine the flow rate, the water content, the oil recovery, etc), and to organize periodic pumping formation fluid from each reservoir with different settings and with different cycles without stopping the whole setup, adjusting the length of stroke of the polished rod pumping unit (not shown), and the number of swings.

The intervals a-b and b-g are dependent on the lengths used plungers:

where

La-b- the length of the interval a-b,

LPL- the length of the plunger 17,

Lin-g- the length of the interval in-g

LPL- the length of the plunger 19.

Thus, the total stroke length of the combined plunger installation will be equal to:

or

where Lmouth- the total length of the stroke of the combined plunger.

This dependence allows to adjust the amount of the pumped formation fluid from each reservoir, changing only the size of the lengths of the plungers 17 and 19, with the condition that the total length of the combined plunger is not changed.

The use of the proposed installation will be selected wells from each formation optimally, that provide a significant increase in oil.

Application of the proposed installation will allow you to:

- conduct research each reservoir the flow rate and water cut without attracting teams the current repair of wells, adjusting the stroke length and the number of oscillations of the pumping unit;

to exploit one of the productive strata, stopping the operation of another stratum, regardless of their formation pressure. Thus, it becomes possible to operate each layer with periodically changing the operating modes without the involvement of teams of fluid repair of wells;

- to operate the wells, complicated ARPD;

- to operate in wells with the products having a higher viscosity;

- change the settings of pumping without lifting the entire surface mounting.

Installation for dual operation of two reservoirs, including rod pump plunger, cylinder, suction and discharge valves, characterized in that the cylinder is provided with a lateral valve with filter, fixed on the cylinder of the auxiliary cylinder with the side hole and the casing to form between the auxiliary cylinder and the casing annular space, the lower end of the cylinder is plugged by a plug, the casing is secured a suction valve, a filter and a shank with a packer on the end, the plunger is made combined, consisting of United stock upper and lower plungers of valves by placing the top of the plunger within the cylinder and the bottom of the plunger inside the auxiliary cylinder the lower plunger and rod have a channel on the I's message space above and below the lower plunger, the upper plunger and rod have a channel for connecting the space below the upper plunger to the entrance of the upper valve plunger.



 

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