SU1555529A1 - Deep-well combination pumping unit - Google Patents

Abstract

The invention can be used in the operation of low production wells with low reservoir pressures. The purpose of the invention is to increase the pumping depth of the fluid by increasing the depth of the suspension of the sucker-rod pump (H) 4 in well 2 without a corresponding extension of the string 8 of the sucker rods. In the annulus 1, a packer 18 is installed. The column 3 of the pump tubes at the location of the annular interplunger cavity 14 of the stemless H 9 and H 4 is provided with openings 19, 20. The hydrochannel 17 is permanently open. The 15 H 9 suction valve is located in the stage 21 of the cylinder 10 H 9 of a smaller diameter. The injection valves 16 are located in differential pair 11 that are connected to a hollow rod and pass through plungers 12, 13. The packer 18 is located below the holes 19 at the location of the cavity 14. The holes 19 are designed to hydraulically communicate the cavity 14 with the space 1. 1 sludge.

Description

one

(21) 4288567 / 25-29

(22) 07.22.87

(46) 04/07/90. Bul № 13

(71) Central Research Laboratory of the Production Association Ukrneft and the Oil and Gas Production Department Poltavaneftegaz

(72) F.S. Semikashev, D.A. Eger, O.K.Kis, V.N. Bulbas

and I.A. Novomlinsky

(53) 621.651 (088.8)

(56) USSR author's certificate

No. 1190084, cl. F 04 B 47/02, 1984.

(54) COMBINED DOWNHOLE PUMP INSTALLATION

(57) The invention may be used in the operation of low production wells with low reservoir pressures. The purpose of the invention is to increase the pumping depth of the fluid by increasing the depth of the suspension of the sucker-rod pump (H) 4 in well 2 without a corresponding extension of the string 8 of the sucker rods. A packer 18 is installed in the annulus 1. Column 3

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The pump tubes at the location of the annular interplunger cavity 14 of the rod-less H 9 and H 4 are provided with openings 19, 20. The hydrochannel 17 is permanently open. The 15 H 9 suction valve is located in the stage 21 of the cylinder 10 H 9 of a smaller diameter. Pressure valves 16

The invention relates to a technique for oil production, in particular, to borehole pumping units of the combined type, and can be used in the operation of deep low-yield wells with low reservoir pressures.

The purpose of the invention is to increase the pumping depth of the fluid by increasing the depth of the pump suspension in the well without a corresponding elongation of the rod of pump rods.

The drawing shows schematically a combined well pump installation, a general view.

The combined well pumping installation contains a sucker rod pump 4 located in the annulus 1 of well 2 by means of a column of pump pipes 3, in a housing (not shown) which has a cylinder 5 placed in the cavity of the cylinder 5 of the stem pump 4 a hollow plunger 6 with a discharge valve 7, mounted with the column of pump rods 8, located under the sucker-rod pump 4, the rod-less pump 9 in the form of a stepped cylinder 10 with a differential pair installed in it of 11-stem plunger interconnected by a hollow rod 12 and 13, the upper 12 of which are made of a larger diameter with the formation of an annular inter-plunger cavity 14, which is hydraulically connected with the pipe space 1 of well 2, as well as the suction 15 and discharge 16 valves of the rodless pump 9, and the rod 4 and A stemless 9 pumps are installed with the possibility of forming between the hollow plunger 6 of the sucker rod 4 and the upper passage plunger 12 of the stemless 9 pump of the hydraulic channel 17. The pump installation is additionally equipped with a packer installed in the annulus 1 well 18. nasosraspolozheny m column coupled to a hollow rod 11 through passage differential pair of plungers 12, 13. The packer 18 arranged below the apertures 19 at the location of cavity 14. The openings 19 are arranged to the cavity 14 fluid communication with the space 1 1. yl.

The pipes 3 at the location of the annular inter-plunger cavity 14 of the rod-less 9 and above sucker-rod 4 pumps are provided with openings 19 and 20. The hydraulic channel 17 is permanently open. The suction valve 15 of the rodless pump 9 is located in the stage 21 of its cylinder 10 of smaller diameter, the discharge valves 16 are located in the differential pair of through-flow plungers 12 and 13 connected by a hollow rod 11. The packer 18 is located below the holes 19 in the column of pump tubes 3 at the location of the ring interplunger the cavity 14 of the rodless pump 9, made with the possibility of hydraulic communication ring annular plunger cavity 14 with the annular space 1 well 2, sealed from the atmosphere at the mouth 22 boreholes, for example, by means of a gate valve 23. An upper 12-diameter plunger with a larger diameter is installed in the upper stage 24 of the cylinder 10 of a larger shaftless pump 9, Bottom 21 and the upper 24 stages of the cylinder 10 of the rodless pump 9 are installed in the column of pumping pipes 3, respectively bearings 25 and 26. The rodless pump 9 is equipped with a fishing device 27 and a differential pair 28, connected to each other by a hollow rod 11 through plungers t2 and 13. Sealing the annulus 1 of the well 2 at its mouth 22 Creates a gas damper 29 for smoothing pressure pulsations in the hydraulic system and alternating loads in the kinematic system (not indicated) by the combined well of the pumping unit during its operation. In the sub-packer zone 30 of the installation, its shank 31 is placed, and the column of pumping pipes 3 at the mouth of the well 22 is equipped with a discharge line 32.

The proposed combined well pump works as follows.

After descending into the well 2, the sucker-rod 4 and the rod-free 9 pumps fill the well with liquid up to mouth 22 and close the slide 23, blocking the annulus 1 of the well, and then start up the installation.

When lifting the column of pump rods 8 by a ground drive (not shown), the hollow plunger 6 of the rod pump 4 also moves upward in the cylinder 5, and the discharge valve 7 of the rod pump 4 closes and the liquid from the cavity of the pump tube 3 above the rod pump partially enters the discharge valve line 32, and partly through the holes 20 into the supra-packer part (not shown) of the borehole space 1 of well 2. As a result, on the differential pair of 11 through plunger 12 and 13 connected to each other by a rodless bushing pump A pressure difference is created and the corresponding force is directed upwards, since the total pressure of the hydrostatic liquid column above the packer section of the annular space and the hydrodynamic pressure of the rod pump 4 from the cavity of the tubing string 3 located above pump (through holes 22 - the annulus 1 - holes 19), and on top of the top 12 inlet plunger of the rodless pump 9 only hydrostatic pressure acts about the liquid column in the hydraulic channel 17 (height from the upper 12 inlet plunger to the hollow plunger 6 of the sucker rod pump 4, equal to the difference of the installation marks of the sucker rod 4 and the rodless 9 pumps), since during the course of the field plunger 6 of the sucker rod 4 upward the discharge valve 7 is closed and the pressure above it is not transferred to the hydrochannel 17, and under the hollow plunger 6 a vacuum occurs due to the suction of the liquid.

Thus, the differential pair of through plungers 12 and 13 of the rodless pump 9 due to the resulting pressure difference affects the upward force, and the passage

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plug plungers 12 and 13 with hollow. the rod 11 is moved along the respective stages 24 and 21 of the cylinder 10 of the rodless pump 9 also upward, following the hollow plunger 6 of the rod pump. Since the plungers 12 and 6 have equal diameters, the balance of forces is not disturbed during the full stroke upward time of the hollow plunger of the sucker-rod pump, and the rodless pump duplicates this movement before lifting to the top of its through-flow plungers 12 and 13 point. I

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When upward the differential pair of through plungers 12 and 13 of the rodless pump 9 (after the hollow plunger 6 of the rod pump 4) is opened, the suction valve 15 is opened, and. the well fluid from the sub-packer cavity 30 of the well 2 through the shank 31 enters the rodless pump 9.

When the direction of movement of the column of pump rods 8 is changed, the hollow plunger 6 of the rod pump 4 moves downward, the pressure in the hydraulic channel 17 (under the plunger 6) increases, and the discharge valve 7 opens. At the same time, a differential pressure of the hydrostatic liquid column along the hydrochannels acts on the differential pair of through plungers I2 and 13 of the rodless pump 9 on both sides of the top 12 plunger: the cavity of the column of pump tubes 3 above the rod pump 4 - holes 20 - bludgeon 1 - holes 19 - annular The interplunger cavity 14 of the rodless pump 9 acts on the upper 12 inlet plunger below, and the cavity of the column of pumping pipes above the rod pump 4 - valve 7 is the hydrochannel 17, acts on

45 upper 12th plunger through passage from above. Since at this moment (with the discharge valves 16 closed), the pressure above and below the upper 12-way plunger of the rodless pump 9 is approximately

50 are equal (dynamic pressure can be neglected), then due to the difference of the effective cross sections of the differential pair of flow plungers 12 and 13, as well as under the influence of its own

55 weight occurs resulting force downward, which causes the movement of the plunger through the rodless pump downward following the hollow plunger 6 of the rod pump 4.

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During the further course of the 11-stem plunger 12 and 13 of the rodless pump 9 connected down by the hollow rod, the suction valve 15 is closed down, the pressure in the receiving cavity (not indicated) of the rodless pump 9 increases to the pressure above the upper 12 valve plunger (i.e. the pressure values of the hydrostatic liquid column in the cavity of the column of pump tubes 3 up to the mouth of 22 wells 2), and the fluid from the receiving cavity of the rodless pump 9 through the discharge valve 16 is a hollow rod 11 is the second discharge valve 16 before pours into the hydrochannel 17 of the cavity of the pumping pipes 3 and further through the discharge valve 7 into the cavity of the column of pumping pipes 3 above the sucker rod pump 4. From the moment the discharge valves 16 are opened, the effective plunger 12 and 13 are moving downwardly connected to each other. of the rodless pump 9 and the pressures acting on them are practically equalized, and the interconnecting flow passages - the plungers 12 and 13 of the rodless pump 9 continue to move down to the extreme position due to their the total weight, immersed in the corresponding stages 24 and 21 of the cylinder 10 filled with liquid. In this part of the liquid from the annular interplunger cavity 14 through the holes 19 flows into the nadakuer part of the annular space 1 and further through the holes 20 into the cavity of the column of pumping pipes 3 above the sucker rod pump 4, and the total volume of fluid entering the cavity of the column of pumping pipes above the sucker rod pump from annular interplunger cavity 14 and from the receiving cavity of the rodless pump 9 (via discharge valves 16 and 17) are equal to the theoretical volume of one stroke of the hollow plunger 6 of the rod pump 4.

During the up-and-downstring of the string of pumping rods 8, the cycles are repeated, with each upward movement of the moving plunger system of the flowline 32 of the well 2 pumping a volume of well fluid equal to the supply of the rodless pump 9 (theoretical volume of one stroke of the lower thrust plunger 13).

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During the operation of the proposed installation with a gas damper 29 in the annulus 1 of the well 2, the pulsations of pressures and fluid flows are smoothed, and the dynamic loads that occur are also reduced.

Claims (1)

Invention Formula Combined well pumping installation containing a rod pump located in the well annulus by means of a column of pump pipes, in whose case a cylinder is installed, a hollow plunger with a pressure valve located in the cylinder cavity of a rod pump, connected to a column of pump rods, a rodless pump located under the rod pump the form of a stepped cylinder with a differential pair installed in it of a hollow rod of through-flow plungers interconnected by a hollow stem, a larger diameter with the formation of an annular interplunger cavity, hydraulically communicated with the annular space of the well, as well as suction and discharge valves of the rodless pump, and the sucker rod and poleless pumps are installed with the possibility of forming between the hollow ram of the sucker rod and the upper rod plunger of the rodless hydrograph pumps of the rodan that, in order to increase the pumping depth of the fluid by increasing the depth of the pump suspension in the well without a corresponding extension of the columns The sucker rods, the installation is additionally equipped with a packer installed in the annulus of the well, a column of pump tubes at the location of the annular inter-plunger cavity of the rodless and above the sucker rod pump is provided with openings, the suction valve of the rodless pump is located in the stage of its smaller diameter cylinder , a differential pair of interconnected hollow rod through-flow plungers is equipped with an additional discharge valve, with the main and additional body, injection valves are located in a differential pair of through-flow plungers connected to a hollow stem, and the packer , 0 placed below the holes in the hydraulic column pump tubes at the location of the annular interplunger cavity with annular interplunger cavity with the annular well space, sucker pump, made with air, made sealed.