SU1645489A1 - Formation tester - Google Patents

Abstract

Arrangement refers to reaiorc development of oil and gas. 1 (in order to ensure the reliability of vorpoMCToa rooms, the expansion of technological functions and the ampli fi cation of lifting the jet pump. The device contains a body 1 having an axial canal 2 and radial holes 3, is blocked to the cuff 4. A body rope i install jet pump

Description

The invention relates to oil and gas exploration, in particular, well testing equipment.

The purpose of the invention is to increase the reliability of the device, to expand technological functions by allowing the recording of the pressure recovery curve, as well as to facilitate the lifting of the jet pump, regardless of the actual pressure drop.

The drawing schematically shows the proposed device.

The device consists of a body 1 having an axial channel 2 and radial holes 3 blocked by a cuff 4. The body is connected to the upper 5 and lower 6 parts of the pipe string. The bottom part 6 of the tubing string contains a packer (not shown) that overlaps the annular gap between it and the casing 7 of the well. A jet pump 9 running on a cable 8 is installed in the axial channel 2 of the housing and has a nozzle 10 with a nozzle 11, the entrance to which is provided from the inner tube space 12, the mixing chamber 13, the diffuser 14, the outlet 15, and the injection channel 16 connecting the chamber mixing with space 17 and further with the formation. The injection channel is closed by a check valve that turns on the ball.

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18 and a spring 19. Below the non-return valve, the injection channel 16 is connected to the in-tube space 12 by holes 20. A sleeve 21 installed on the injection channel blocks these holes 20. The sleeve 21 is held in the lower position by a spring 22. The upper part of the jet pump has a head 23, which is secured to it by the pin 24 and can be moved relative to it in the axial direction by means of the groove 25 for the pin 24. The head 23 is fastened directly to the cable 8, which is lowered from the mouth. The head 23 and the sleeve 21 are interconnected by a rod 26 and move together. At the bottom of the jet pump, a remote device 27 with a pressure sensor is rigidly attached.

The device works as follows.

The pipe string together with the device body 1 is lowered into the well and packaged. A jet pump is also lowered into the well on the hydrogrid (9 s. Attached deep-well devices 27. It is possible to use devices with local registration or remote transmission of information, in the latter case, instead of a cable, a geophysical cable is used, the wires of which are connected to the deep-well devices. Thereafter like a jet pump

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will take its place in the axial channel 2 of housing I, the working fluid is pumped into the well by means of a pump unit. Under the action of the pressure differential, a final fit of the jetting pump is made in the housing, after which it is activated. The working fluid and internal piping space 12 are ejected through the nozzle 11 of the nozzle 10 into the mixing chamber 13 and through the diffuser 14, the outlet openings 15, the radial openings 3 are retracted into the annulus, pressing the cuff 4 and outwards through the annular space ,

In the mixing chamber, a depression is created, with the result that the pumped liquid of the space 17 lifts the ball 18 and compresses the spring 19, after which it is carried away by the flow of working fluid to the surface. The pressure below the jet pump is recorded by the depth gauge 27. During operation, the cable 8 is loosened, the head 23 and the sleeve 21 are in the lower position under the action of the spring 22, the sleeve 21 blocking the holes 20, the section of the inner tube 12 and the injection inlet 16.

To record the pressure recovery curve, the supply from the surface of the working fluid is stopped, and at the same time the pipes and the annulus are pressurized slightly above the reservoir. With the cessation of circulation of the working fluid, the ejection effect disappears, the pressure in the mixing chamber increases and becomes equal to the inline pipe, the ball 18 under the action of the spring 19 and the pressure drop from top to bottom instantly closes the channel 16 with the injection housing 1, / 1n pressure on | device and under it. When the cable 8 is tensioned, the head 23 moves upward, while the pin 24 slides along the groove 25. The head 23 moves through the cable 26 to the sleeve 21. As a result, the holes 20 open, pressure is equalized in the space 12 above the device and in the space 17 under by him. In the future, the jet pump easily comes out of the socket in the housing 1. The tests can be repeated if the recording turned out to be of poor quality, after appropriate adjustment and repair of the instruments, while lifting the entire pipe string is not necessary. The open axial channel also provides the descent to the bottom of instruments for geophysical measurements and. perforation.

Claims (1)

Invention Formula A device for testing formations containing a housing with axial and radial channels mounted on the Truo column above the packer, a jet pump placed in the axis of the housing channel, connected with a geophysical cable or cable attached to its head, and including a mechanism to shut off the fluid flow in the form of a check valve, characterized in that, in order to increase the reliability of the operation of the device, to expand technological functions by allowing the recording of the pressure recovery curve using instruments with local registration walkie or remote ary instruments, as well as to facilitate lifting of the jet pump, regardless of the current, a reverse pressure differential In the subpacker space 17, a valve is installed in the injection channel pressure is restored to the reservoir, recorded by the instruments 27, and the ARC is recorded. When recording an HPC, the pressure above the device should be slightly higher than the pressure below the device, which provides both the overlap of the injection channel 16 by the ball 18 and the elimination of the jet pump from the socket jet pump, which is made with additional radial holes for communication of its injection channel with the in-line space and has a spring-loaded sleeve with a connection for communication with the head, installed with the possibility of blocking additional radial holes of the jet pump in the lower position of the head.