SU968365A1 - Apparatus for investigating wells and testing formations - Google Patents

Description

The invention relates to the field of geochemical and geophysical methods for well testing, namely, devices descended on a logging cable and intended for conducting operational well studies using the formation test method associated with solving a number of geological problems by determining the hydrodynamic properties of the formations and nature of their saturation.

Instruments for research are known. skvstskin and formation testing, lowered into the well on the logging cable.

Such devices have an electro-mechanical drive, a sampler, sealing elements, insulating object of study, valves 1.

The presence of space in the sealing elements filled with drilling mud, as well as the inability to remove it and the mixture of the reservoir; fluid from the drilling fluid from the test zone distorts the results of the research. . It is also known a device for investigating wells and testing formations, which contains, in addition to an electromechanically driven, us

and valves, also, hydraulic packers, a sampling channel extending into the space between the packers, and a gate of the sampling chamber with an individual drive 2.

However, the design of this device is complicated due to the presence of a sampling chamber with two openings, covered with spring-loaded

10 entrance gate, and exit, neper indoor shutter with individual drive. The presence of a flow-through sampling chamber reduces the quality of the sample being sampled and the lack of the ability to regulate pressure in the strength of the packers reduces the reliability of their operation.

A device for well testing and formation testing is known, comprising a housing / pump with a chamber i, an electromechanical drive with a piston, channels with suction and discharge valves, a hollow rod with

25 iINDIVIDUAL drive and skimmers, hydraulic packers, a sampling channel extending into the space between the packers, a sampling chamber, a chamber in communication with the well, a relief valve and a C3 plunger.

Claims (1)

30 The design of the known device is complicated due to the presence of an individual drive for controlling a hollow stem with separating sleeves, which, in turn, reduces reliability. In addition, the reversal of the movement of the piston against the stop leads to irrational dynamic overloads of the pump, and an increase in the load current at the same time reduces the reliability of the motor operation. The aim of the invention is to increase the reliability of the device. This goal is achieved by the fact that the device is equipped with limit switches and interacting with the piston of the pump pusher with spring-loaded stops, and three additional chambers, one of which has an additional pusher and a separating piston dividing the chamber into the upper cavity filled with air, are installed in the housing. , and the lower new cavity filled with liquid, the other is sealed with the uppermost hollow stem, filled with liquid and communicated with the channels with the lower cavity of the first additional chamber, and the third and It has a hydraulic lock, is filled with air and is sealed with a lower and hollow stem, than the additional pusher is located in the upper cavity of the first additional chamber with the ability to interact with the pump piston in its lowest position. The drawing shows a device for well testing and testing of formations, a general view in section. The device contains an electric motor 1, a gearbox 2, a pump 3 and with a chamber 4, limit switches 5 and b, pushers 7 and 8, springs 9 and 10, stops 11 and 12 with valves 13-15, hydraulic packers 16, the cavity of which Via a channel 17, a chamber 18 with a chamber 19 connected with a well, an overflow adjustable valve 20, an interstitial cavity 21 of valve 20 is connected to a discharge channel 22 between two successively installed discharge valves 13 and 15, a plunger 23 located in the chamber 24 connected to the hydraulic cavity packers 16, hollow rod 25 with separators 26-29, separating juice 30, which is the gate of the sampling chamber 31, which is connected by means of the inlet and chamber 32 with the chamber 33 and the channel 34 for sampling, going into the interpacker space . The lower end of the hollow rod 25 is installed in the chamber 35 with a separating piston 36 forming cavities, with the upper end of the lower end of the hollow rod 25 being filled with liquid and the lower end with air. The upper juice 37 at the end of the hollow stem 25 is tightly inserted into the fluid-filled ca- meter 38, which communicates through the channel 39 and the valve 40, as well as through the channel 41 and the stop valve 42 with a chamber 43 / in which the separation piston 44 is installed, forming two cavities, one of which is filled with liquid and the other with air, and in the cavity filled with air, an additional pusher 45 is installed, the end of which goes into the chamber of pump 4. The chamber of pump 4 is connected by a channel 46 through a radial opening, 47 and 48 and an axial channel floor stock 25 with channel 34 for sampling. The operation of the device is monitored by pressure sensor 49. A well above the upper packer and below the lower packer is communicated by channel 50 to prevent the impact of a hydraulic impact on the elements of the device at the time of opening the sampling chamber 31. The device operates as follows. In the initial position, the sampling chamber 31 is sealed from the well by a shutter 30 located on the rod 25, Separating sideways 28 and 29 divide the cavity of the hydraulic packers 16 and the channel 34 for sampling with the chamber 19 communicating with the well. After the device is installed on the object under study, the VOKOM switches on the limit switches 5 and 6, including pump 3. The piston of pump 3, progressively moves down, comes in contact with surface A with the pusher 8, which in turn moves spring 10 and the stop 12, including switch 6. The direction of movement of the piston is reversed, and it moves progressively upward. Moving upward, the piston of the pump 3 comes into contact with the pusher 7 by the surface B, moves the latter and through the spring 9 and the stop 8 turns on the switch 5. The direction of movement of the piston changes and it moves down. Thus, the piston of the pump 3 reciprocates. The well fluid through the channel 34, through the axial channel of the hollow rod 25, through the channel 46, through the valve 14 enters the chamber 4 of the pump 3. With the return movement of the piston on the pump 3, the well fluid is pumped through the sequentially installed valves 13 and 15 through the channels 17 and 22, through the radial clearances between rocks 26-28 into the cavity of hydraulic packers 16. Pressure, aged in the cavity of the packers 16, acts on the plunger 23, which pushes the spring-loaded overflow valve 20. Moving up, the overflow valve 20 opens the interconnecting cavity 21, connect it with the well. The channel 22 and the chamber 4 of the pump 3 are also connected through this cavity to the well. So, as the pressure in the cavity of the hydraulic packers 16 is higher than the pressure in the well, the check valve 15 tightly closes the cavity of the packers 16, and the overflow valve 20 is in the upper position, which allows free communication of the chamber 4 of the pump 3 with the well. Packers 16 hermetically isolate the volume of research from the wellbore. For further operation of the pump. 3, the liquid is pumped out from the interpackage space, and accordingly from the formation. Fluid is discharged into the well through valve 13, through channel 22, and through the interconnecting cavity of the translucent valve 20. As follows: the process of fluid inflow from the reservoir occurs. At the same time, the hydrodynamic parameters of pressure sensors 49 are measured and, with a characteristic of the composition of the fluid, which is monitored, for example, by a resistive meter (not shown). At the end of the pumping out of the reservoir, the limit switches 5 and 6 are disconnected from the power supply. The piston of the pump 3, moving downwards, leaves the working range bounded by the final switches, this is achieved by the presence of a spring 10, which is compressed, allowing the piston to be moved downward. Moving, porien pump 3 with its lower plate comes into contact with the pusher 45. The latter moves the separating piston 44 down, displaces the liquid from the chamber 43, through the valve 40, channel 39 into the chamber 38, while moving the rod 25. Due to the fact The piston 44 has a large area, the upper end of the hollow rod 25 is undesirable, and the displaced volume of fluid from chamber 4 will occupy an equal volume in chamber 38, the hollow rod 25 additionally moves with, compressing air, the lower end into chamber 35. Thus, moving the rod downwards , the shutter 30 enters the chamber 32, open and the sample chamber inlet 31. Open | term fixed sampling chamber pressure sensor 49, at this point the pump 3 is turned off, the movement of the rod 25 downwards is stopped. The sample from the reservoir through the inlet, chamber 32, along the axial clearance of the inlet enters the sampling chamber 31. The filling of the sampling chamber is monitored by the pressure sensor 49 to restore the pressure. At the end of the sampling period, the pump 3 is turned on, the hollow rod 25 moves down, the shutter 30 exits from chamber 32 and hermetically closes the sampler inlet below chamber 32. Dividing juice 29 enters chamber 33, thereby connecting the interpacker space with the well through the sampling channel 34. Dividing the juice 28 goes into the chamber 19, providing a connection of the chamber 18, and hence the cavity of the packers 16 with the well. The pressure in the interpacker space and the cavity of the packers are consistently aligned to hydrostatic, and the elastic packers 16 return to their original position. When the hollow rod 25 reaches its lowest position, the pump 3 is turned off. The device returns to the surface with a sealed breakdown. The use of limit switches and pushers with spring-loaded stops | allows smoothly reversing the movement of the piston without dynamic loads, avoiding irrational overloads of the electric motor, which increases. reliability of the device, as introduced. Separating a piston chamber, a pusher exiting the pump chamber, a chamber sealed with an upper hollow stem and communicating through channels with the separator piston chamber and a hydraulic lock chamber with a sealed lower hollow piston, allows the pump piston to be moved downwards. and control the movement of the hollow stem without an individual drive, and this contributes to simplifying the design of the device, reducing its length and weight by up to 20%, and ultimately improving the reliability of troystva. Claims An apparatus for surveying and testing formations, comprising a housing, a pump with a chamber and an electromechanical actuator with a tear, channels with suction and pressure valves, a hollow rod with reservoirs, a hydraulic sampling channel -. A space between packers, a sampling chamber, a chamber in communication with the well, an overflow valve and a plunger, characterized in that, in order to increase the reliability of the device in operation, it is equipped with limit switches and interacting with a pump piston with spring-loaded stops, In the casing, three additional chambers are made, one of which has an additional pusher and a separating piston dividing the chamber into the upper cavity filled with air to the lower cavity;