SU502113A1 - Formation testing device - Google Patents

Description

one

The invention relates to the testing of wells during their drilling or trial operation.

A device for testing formations is known, comprising a housing associated with a drill pipe, a stepped stem with channels forming a sealed chamber with the housing, and a shut-off valve.

The disadvantage of this device is the impossibility of transition (at the request of the operator) to other depressions directly in the process of selection of formation fluid.

The purpose of the invention is to provide an opportunity to test formations of any flow intensity at various depressions.

For this, the proposed device is provided with a spring-loaded piston placed above the cup and connected by means of a screw pair to a column pipe.

The drawing schematically shows the proposed device.

The device comprises a housing 1, a stepped rod 2, forming a chamber 3 with the case, communicated by channel A with the annular space, a cup 4 forming with the rod 2 an airtight chamber 5, a spring 6, a screw pair 7 with a piston 8 acting as a shut-off valve . Screw pair 7 is made

with channels B and C for passing the formation fluid and communicating with the body using slots 9 and 10.

Prior to testing the well, the device is connected via a screw pair 7 to the lower end of the string of pipe 11 above the tester set 12 with the nozzle removed, the packer 13, the filter 14, and the assembly in the components shown in the drawing is lowered into

well. In order to obtain information about the testing process, depth gauges 15 and 16 are installed in the filter 14 and in the pipes 11. When the weight of the pipes is reached, the sealing elements of the packer are deformed

13, sealing the test area. At the same time, the screw pair 7 with the piston 8 moves downward, compressing the spring 6 until it stops against the bearing 17. The inlet tester opens, causing inflow from the formation. The fluid flowing from the reservoir creates pressure on the brush 2 but an area of 5tb and, at the moment when the upward force from this pressure increases the pressure from the hydrostatic pressure Pschd in chamber 3 over the area (5tb-5pcs) and the previously adjusted effort Q from the springs 6, the rod 2 moves upwards, and the slotted channels partially open, together with the test area with the internal cavity of the tubes I.

sampling at a given bottomhole pressure.

3

In order to evaluate the reservoir in other modes, the pipe string is turned by a rotor for a certain number of revolutions. In this case, the screw pair 7 moves the piston 8 by changing the magnitude of the force Q of the spring 6, which leads to a change in the bottomhole pressure. The number and magnitude of bout pressure changes are set as desired by the operator. At the end of the test, the column of pipes is turned further and the screw of steam 7 lifts the porsche 8, which enters the constricted part of body 1, stopping the sampling. The splines 10 are disengaged, and non-movement of the piston 8 is stopped. A pressure gauge 15 records the pressure recovery curve.

502113

4 Formulaes isotopes

A device for testing formations comprising a housing associated with a drill string, a stepped shaft with channels, forming a chamber with the housing in communication with the annulus, a cup forming a pressure chamber with the rod, and a shut-off valve, characterized in that , in order to provide the possibility of testing formations of any flow intensity at different depressions, it is equipped with a spring-loaded piston located above the glass, connected by means of a screw pair with a pipe string.