RU214552U1 - DEVICE FOR HYDRODYNAMIC STUDIES OF A WELL - Google Patents

Abstract

The utility model relates to the field of oil and gas production and can be used when measuring the parameters of the "well-reservoir" system using the methods of hydrodynamic studies of wells (well testing) in the drawdown mode, in particular, by recording the pressure recovery curve (PRC). The device comprises a housing (1) suspended in the well on a geophysical cable (2), located in the housing (1) a control unit (4) and an electric motor (5) connected to the electric motor (5) a rod (10) that transmits the load to the packer ( 11), an anchor installed above the packer (11), an equalizing valve, pressure compensators (17), (18), a remote downhole tool (23) attached to the adapter tip (22) at the lower end of the device. The anchor contains a bushing (12) mounted on the rod (10) and made with flow channels (12.1) and radial holes, and fixing balls (13) placed in the radial holes of the bushing (12) with the possibility of movement. An annular groove (10.1) is made on the rod (10) to accommodate fixing balls (13) of the anchor in it in the non-working (transport) position of the device. EFFECT: increased efficiency of the device for hydrodynamic studies of the well. 4 ill.

Description

The utility model relates to the field of oil and gas production and can be used when measuring the parameters of the "well-reservoir" system using the methods of hydrodynamic testing of wells (well testing) in the drawdown mode, in particular, by recording the pressure recovery curve (PRC).

A device for hydrodynamic research and well testing is known, comprising a first body suspended on a geophysical cable, placed in the first body an electric motor with a gearbox connected to the electric motor by a packer-anchor screw drive, a load transfer rod to the anchor-packer, a balancing valve installed by means of a coupling-nut below the first housing, the second housing, the second electric motor mechanically connected to the equalizing valve, and the telemetry unit, placed in the second housing, the remote downhole tool attached to the tip of the cable head at the lower end of the second housing, while the anchor includes wedge dies in the form of a toothed a rail designed to rest against the inner walls of the well or tubing strings (tubing pipes), and a wedge ram expander (RU 2584169 C1, publ. 05/20/2016).

It is also known a device for hydrodynamic monitoring of wells, taken as the closest analogue, containing a body suspended on a geophysical cable, in which an electric motor and a switching unit are located, connected to the electric motor by means of a screw transmission, a rod that transmits the load to a packer installed below the body, an anchor installed above packer, balance valve, pressure compensators, remote downhole tool attached to the tip of the cable head at the lower end of the device, while the anchor includes wedge rams in the form of a rack designed to abut against the inner walls of the well or tubing string, and a wedge ram expander (RU 2471984 C2, published on January 10, 2013).

The technical problem of the known devices is the lack of efficiency when conducting hydrodynamic studies of the well, due to the likelihood of axial displacement of the device along the well, casing string or tubing string, which leads to distortion of the measurement results, reduces the efficiency of hydrodynamic monitoring. The displacement may occur due to insufficiently reliable fixation of the device, which is able to provide the anchor of a known design.

The technical result of the utility model is to increase the efficiency of the device for hydrodynamic studies of a well.

The technical result is achieved by the fact that in the device for hydrodynamic studies of a well, which, like the closest analogue, contains a housing suspended in the well on a geophysical cable, a control unit and an electric motor are located in the housing, connected to the electric motor by means of a screw transmission, a rod that transfers the load to packer, anchor installed above the packer, balancing valve, pressure compensators, remote downhole tool attached to the adapter at the lower end of the device, according to the utility model, the anchor contains a sleeve mounted on the rod and made with flow channels and radial holes, and fixing balls , placed in the radial holes of the sleeve with the possibility of movement, while on the rod an annular groove is made to accommodate the fixing balls of the anchor in it in the non-working position of the device.

The proposed device for hydrodynamic studies of the well is shown in the drawings, shown:

in fig. 1 - device in non-working (transport) position, general view, longitudinal section;

in fig. 2 - section A-A in Fig. one;

in fig. 3 - device in working position during hydrodynamic studies, equalizing valve is closed, longitudinal section;

in fig. 4 - device in working position after hydrodynamic studies, equalizing valve is open, longitudinal section.

The device for hydrodynamic studies of a well contains a housing 1, which is lowered on a geophysical cable 2 into a well, a casing string or a tubing string 3. In the housing 1, which is made sealed, a control unit 4 is sequentially placed, connected via electric wires 5 to a geophysical cable 2, an electric motor 6, planetary gear 7, a screw gear consisting of a screw 8 and a nut 9 for converting the torque of the electric motor 6 into the translational movement of the nut 9. A rod 10, consisting of several parts, is connected to the nut 9 of the screw gear. The rod 10 is used to transfer the load from the electric motor 6 to the packer 11, which provides a hermetic overlap of the flow section of the pipe string 3 by expanding the rubber cuffs.

The anchor installed directly above the packer 11 mechanically interacts with the packer 11. The anchor provides centering of the device inside the tubing 3 and fixation of the device at a given depth of research. The anchor of the proposed design consists of a sleeve 12 made with radial holes in which locking balls 13 are placed with the possibility of longitudinal movement. The sleeve 12 has flow channels 12.1. To interact with the locking balls 13 in the transport position of the device on the rod 11, an annular groove 10.1 is made, which has a lead-in cone in the lower part.

The transfer of the load from the electric motor 6 to the packer 11 and the remote control of the opening-closing of the packer 11 is carried out by means of the pusher 14. To interact with the pusher 14, the rod 10 is made with a thrust step 10.2. Inside the pusher 14 there is an equalizing valve containing a piston 16 installed in the chamber 15, which interacts with the flow holes 14.1 made in the pusher 14.

Pressure compensators 17 and 18 are installed in the upper and lower parts of the rod 10, designed to balance the hydraulic pressure of the liquid column on the rod 10, acting in the process of conducting hydrodynamic studies.

The upper part of the housing 1 is connected to a standard instrument head 19, which serves to fasten the device to the tip 20 of the geophysical cable 2 and provides electrical connection of the strands of the geophysical cable 2 with the electric wires 5 of the control unit 4 and the transit wire 21. An adapter tip 22 is installed in the lower part of the device. under a standard instrument head and a remote downhole tool 23 connected to it.

The use of an anchor of the proposed design in the device, containing a bushing and fixing balls interacting in the working position with the rod, on the one hand, and with the coupling gap in the tubing string, on the other hand, ensures reliable fixation of the device in the study interval, eliminating axial movement of the device due to impact excess pressure. The constant fixed position of the device during the entire process of conducting hydrodynamic studies allows you to register the formation pressure recovery curve without distortion and determine the correct hydrodynamic parameters of the formation, thereby ensuring an increase in the efficiency of the device for hydrodynamic studies of a well. The implementation of flow channels in the armature sleeve includes the anchor in the cycle of hydrodynamic studies at the stage of pressure equalization in combination with an equalizing valve, which also increases the efficiency of the device. An anchor consisting of a bushing and fixing balls is a structurally simple and reliable technical solution. The use of balls as fixing elements ensures the operation of the anchor without breakage, since significant efforts are required to destroy the balls.

Device for hydrodynamic studies of wells operates as follows.

After creating a pressure drawdown in the well under study, the layout of the device equipped with an anchor of the proposed design is lowered inside the tubing string 3 placed in the well, between adjacent pipes of which there are coupling gaps 24. Using a geophysical cable 2 wound on a winch drum of a geophysical lift, the device is lowered to hydrodynamic studies of the well. The device is in the non-working (transport) position (Fig. 1), in which the packer 11 is closed, the locking balls 13 of the anchor are located inside the annular groove 10.1 of the rod 10 and do not protrude beyond the outer diameter of the sleeve 12 (Fig. 2). The equalizing valve is open, the liquid inside the tubing string 3 has the possibility of free flow through the flow channels 12.1 of the sleeve 12 of the anchor. The upper pressure Pv of the fluid in the above-packer space and the lower pressure Рn in the under-packer space are the same in magnitude.

When the research interval is reached, the device on the geophysical cable 2 is pulled up by means of a winch of the geophysical lift in order to install the fixing balls 13 of the anchor at the level of the nearest coupling gap 24.

To fix the device and seal the tubing string 3 from the wellhead through the geophysical cable 2 and then through the electric wires 5 through the control unit 4, a positive voltage is applied to the electric motor 6. The impact from the electric motor 6 through the planetary gearbox 7 and screw gear is transmitted to the rod 10, which upward movement. With the further movement of the rod 10 upwards, the fixing balls 14 of the anchor are pushed out of the annular groove 10.1 of the rod with a small diameter and roll out along the lead cone to the outer surface of the rod 10 with the main diameter. Further, along the radial holes of the sleeve 12, the locking balls 13 move inside the sleeve gap 24, the diameter of which exceeds the inner diameter of the tubing 3, and occupy the working position in which they are fixed from radial movement by the rod 10. As a result, the device takes a securely fixed position in the research interval inside the column Tubing 3, without the possibility of axial movement. At the same time, when the rod 10 moves upwards, the thrust step 10.2 of the rod 10 rests from below on the end of the pusher 14. The pusher 14 compresses the rubber cuffs of the packer 11, the rubber cuffs increase in diameter to the value of the inner diameter of the tubing 3 and hermetically block the bore section of the tubing 3 (Fig. 3 ).

The opening of the packer 11 blocks the inflow of fluid into the well, as a result of which the pressure Pf of the fluid in the sub-packer space, below the isolated interval, increases and begins to exceed the upper pressure Pv. Conduct hydrodynamic studies. According to the readings of the remote downhole tool 23, the parameters of the pressure recovery curve (PRC) are recorded, and the information is transmitted through the transit wire 21 along the geophysical cable 2 to the surface.

After the completion of measurements and transmission of information, the device is unpacked. To do this, a negative voltage is applied from the wellhead to the electric motor 6, causing the rod 10 to move down. The pusher 15 comes out of contact with the packer 11. As long as there is an excess of pressure Pn in the space under the packer over the pressure Pb above the packer, the rubber cuffs of the packer 11 do not return to the original state. Therefore, the stem 10 moves down inside the equalizing valve chamber 15 in idle mode together with the piston 16 until the moment when the piston 16 opens the flow holes 14.1 of the pusher 14. After the pressure equalizing valve is opened, the lower Pn and the upper Pv are aligned, and the packer 11 closes. There is a flow of fluid from the under-packer space through the flow holes 14.1 of the pusher 14 and the flow channels 12.1 of the sleeve 12 of the anchor into the over-packer space (Fig. 4).

The return of the rod 1 to the lowest position ensures the return of the locking balls 13 from the coupling gaps 24 to their original transport position with their placement inside the annular groove 10.1. This restores the ability to move the device in the axial direction, after which the device can be removed from the well with a geophysical cable 2.

Claims (1)

A device for hydrodynamic studies of a well, comprising a body suspended in the well on a geophysical cable, a control unit and an electric motor located in the body, a rod connected to the electric motor by means of a screw transmission, transferring the load to the packer, an anchor installed above the packer, a balancing valve, pressure compensators, a remote downhole tool attached to the adapter at the lower end of the device, characterized in that the anchor contains a sleeve mounted on the rod and made with flow channels and radial holes, and locking balls placed in the radial holes of the sleeve with the possibility of movement, while the rod is made an annular groove for placing anchor balls in it in the transport position of the device.

Images