SU819317A1 - Device for investigating wells - Google Patents

Description

(54) DEVICE FOR RESEARCH WELLS

one

The invention relates to field geophysical equipment and can be used in the study of existing wells.

A device is known that includes a downhole tool, launched under a pump on a geophysical cable, passed through the annular space (between the pump-compressor tubes and the casing string), and the surface winch 1.

The disadvantage of the device is low reliability due to the possibility of sticking the device in the annular space.

It is also known a well testing device in which the device is installed under the pump on a cable section, the cable is passed through the channel past the pump, the cable lug in the form of a coupling is installed in a saddle placed in tubing pipes (tubing) below the output line of the pump. There is an oil seal in the channel for cable 2 to pass through.

This device is closest to the invention in its technical essence and the achieved result.

Its disadvantage is that it requires a significant amount of an expensive cable that is in a hostile environment, which can only lead to a deterioration in the reliability indicators of the entire device.

The purpose of the invention is to save geophysical cable and increase the reliability of research.

This goal is achieved by the fact that the device is equipped with a winch mounted on the surface, and the downhole tool has a roller through which a flexible cable is slung, with one end of the cable pro running into the annular space and connected to the winch, and the second is attached to the cork installed in the saddle.

FIG. 1 shows the device, the initial position; in fig. 2 - the same, before the start of the descent of the device to the bottom.

Claims (2)

The device consists of the device 1, fixed by clamp 2, on the shank 3 of pump 4, which through adapter 5, in which valve 6 is placed with seats 7 and 8, is connected to tubing 9. At the lower end of tubing 9 there is seat 10 with plug 11, d on the top - the mouth of the armature with the buffer valve 12 and the gland 13. A flexible cable 14 is laid along the annular space, connected at one end through the roller 15 with the plug I, and the other with the drum of the ground winch 16. The fishing device 18 is lowered on the clip-on wire 17 The device works as follows. Disconnect from the network pumping unit. In this case, due to the lack of pressure from the pump, valve 6 is detached from the seat 7 and sits in seat 8, and the liquid from the tubing flows into the annular space until the same level in the tubing and in the annular space is established. Next, open the buffer valve 12 and on the staple wire 17, the fishing device 18 is lowered into the well. With the fishing device, the plug 11 is seized and the plug is pulled out of the well. At the same time, the end of the flexible cable 14 is pulled out of the well, which is unwound from the drum of the winch 16. Then the end of the flexible cable is disconnected from the plug 11 and the cable lug 19 is attached to it (see Fig. 2). Using a winch 16, a cable lug with a cable 20 is pulled into the well until the packing device 21 is not put into the saddle 10 and the tip enters its nest made in the housing of the well tool 1. Next, close the wellhead with the packing device 13 and start the pump unit. Then, the downhole tool is released from the retainer 2, made on the shank 3 connected to the bottom of the pump unit 4, and by simultaneously lowering and lifting the cable 20 and the flexible cable 14, the downhole tool is pulled in the test intervals. After completion of the study, the downhole tool is lifted upward until latch 2 triggers and the pumping unit is disconnected from the mains. The liquid is drained from the tubing, after which the cable 20 with the tip 19 and the packing device 21 is pulled out of the well. Then, the end of the flexible cable is disconnected from the cable tip, the plug 11 is attached to the latter, and by drawing the flexible cable into the well. using a winch 16, the stopper is placed in the saddle 10. After that, the buffer valve 12 is closed and the pump unit is started. 1. A device for investigating wells equipped with a submersible electric pump connected by means of an adapter with tubing pipes with a saddle in the lower part and with a downhole tool installed under the pump, characterized in that, in order to save the geophysical cable and increase the reliability of research, it is equipped with a surface-mounted winch, and the downhole tool has a roller through which a flexible cable is slung, with one end of the rope passing through the annular space and connected with bedkoy and attached to the second tube, mounted in the saddle. 2. A device according to claim 1, characterized in that the downhole tool is connected to the pump with a clamp. Sources of information taken into account in the examination 1.Portnov V.I. and others. Removing flow profiles in wells operated by downhole pumping. “Oilfield business .1967, № 6. 2. USSR author's certificate for application No. 2185589/03, cl. E 21 B 47/00, 1975 (prototype).