SU1258992A1 - Apparatus for running instruments into borehole - Google Patents

Description

The invention relates to the oil and gas industry and can be applied in the study of wells through the annular space by small-sized instruments on a geophysical cable or wire.

The purpose of the invention is to increase reliability in operation.

FIG. t presents a device for launching instruments into the well, a general view; in fig. 2 - the same, longitudinal section along the plane, passing through the PCTs through the axes of the sleeve and the eccentric coupler; in fig. 3 - eccentric diverter, cross section; FIG. D is a diagram of the movement of the device inside a perforated pipe.

Device for launching devices 1 into the well on cable 2 in the space between the casing 3 and the pump of the hr-krmpr collector pipes D contains eccentric diverters 5 and lengths of thin-walled perforated pipes 6 installed between the deflectors The pump-compressor pipes 4 connect with each other using couplings 7 and have wellhead surround 8. Casing K5 is closed with a faceplate 9. Plate 9 has two through holes through one of which the pump ng-compressor pipes 4 pass, and the upper section of the perforator is connected to the other oval pipes 6, and topside - bricked or to to pass devices 1 .. Eccentric diverters 5 (Figs. 2 and 35 have sleeves a and protrusions made as S couplings. Sleeves a are mounted on pipes 4 with axial rotation - RESTORING {limited by couplings 7 and rings And fixed on pipes 4. Segments of perforated pipes b enter the ends of the Hoof holes (J. Deflectors 5 in order to ensure ease of mounting them on pipe 4, can be made of two halves, bolted 12 (fig. 3). Segments of perforated pipes 6 have thin walls and ut be made of node4 «-deficient material, such as polyethylene.

The device works as follows.

During the descent of the device into the tilting bore, eccentric deviators 5 Under the action of the weight of the tubing string 4

oriented in the field of gravity, so that the string of pipes 4 lies on the wall of the casing 3, and the sleeves O and their connecting segments of the perforated tubes 6 are located in the crescent gap formed between the columns 3 and 4, creating an overpass for lowering the devices into the well. Due to the orientation of the diverters 5 in the field of gravity force, spontaneous wrapping of the overpass formed by the perforated pipes 6j around the tubing 4 is prevented.

During the descent of the device into the well of the coupling about eccentric deviations 5, the thin perforated pipes 6 are prevented from being removed if the device accidentally hits the wall

casing 3.

When the device is lowered into a vertical well, eccentric deflectors 5 move the tubing string 4 to the casing wall 3, and the straightness of the pipe for the instruments is determined by the intrinsic rigidity of the perforated tube sections 6.

Instrument 1 is launched into the well through the lubricator 10 through pipes 6 and couplings of eccentric diverters 5. When the device moves inside the perforated pipes 6 (Fig. 4), the liquid filling the pipes flows from under the device into the area above it as if through a gap between the devices 1 and the wall of the pipe 6, and through the perforated holes in the walls of the pipe 6. After the completion of the research, the device 1 rises to the surface.

The descent of devices into the well, research and lifting devices to the surface is carried out without

shutdown of the well during its operation in natural mode.

Use as an overpass for launching devices into the well of segments of perforated pipes installed between eccentric diverters couplings, allows to expand the field of application of the device. It can be used by E wells with

increased axis tilt angles to the ser-tikali, since this eliminates jamming of the instrument or wireline in the sickle-shaped gap between

3

casing and pump-compressor pipes. The device can also be successfully used in wells with a small angle of inclination of the axis to the vertical, since in this case the straightness and good permeability of the guide channel is provided by the intrinsic rigidity of perforated pipes.

The reliability of the descent of devices into the well (reliability of operation of the device) also increases with the exception of the possibility of jamming of the device or wireline in the crescent gap between the two columns of pipes.

In addition, perforated pipes divide the crescent gap into two zones and therefore contaminants accidentally caught in the viaduct can

258992

be pushed out by the device through the perforations in the non-working area of the well, which also contributes to an increase in the reliability of the device.

The rate of descent of instruments to the object under study increases when using the device in inclined

10 wells, since the friction forces of the instrument and the logging cable against the walls of perforated pipes and couplings are significantly lower than similar forces when the instrument moves in the gap between two

15 columns of pipes, where the jam action of a sickle-shaped gap appears. The logging cable is especially hard in the sickle gap due to the smallness of its

20 diameter and large length.

FIG. 2

Editor 6. Ivanova

Compiled by N. Krivko

Tehred L. Oleinik Corrector. Shekmar

Order 5101/33 Circulation 548 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

FIG.

Claims (1)

DEVICE FOR DRAINING DEVICES INTO A WELL between the casing and tubing, containing eccentric deflectors made in the form of protrusions on the bushings freely mounted on the tubing, characterized in that, in order to increase reliability in operation, it is equipped with perforated segments pipes, and the protrusions are made in the form of couplings, between which sections of perforated pipes are installed. 1258992 A1