SU1104235A1 - Borehole contact device - Google Patents

Abstract

A BOTTOM CONTACT DEVICE, comprising a housing, a contact assembly placed therein, a guide bush filled with a liquid dielectric and blocked by an elastic diaphragm, discharged by a pin, so as to ensure the reliability of the contact operation during rotary drilling using hydropercussion machines, it is equipped with a hollow cylinder, installed with a gap in the guide sleeve above the contact node, and in the upper part of the cylinder has a rolling to a diameter smaller than the diameter of the passage the hub of the guide bushing, but larger than the diameter of the drop pin. 0

Description

The invention relates to the field of well studies and can be used to connect various devices directly in the well during its drilling. A wellbore contact device is known, comprising a body, a contact glass located therein, a guide glass filled with a liquid dielectric and covered with a diaphragm, green. However, the reliability of this device is impaired when using a slatted mortar and under conditions on the inside walls of the drill string solid compounds are formed and sludge particles adhere, which fall during the assembly of the projectile and during the drilling process into the solution. Closest to the invention is a borehole contact device comprising a housing, a contact housing therein, a guide bushing filled with a liquid dielectric and covered with an elastic diaphragm, and a drop pin. The device provides good contact in the course of rotary drilling of small-diameter wells under conditions when solid joints are formed on the inner walls of the drill string and solid compounds that fall into the solution during the assembly of the drill and when the drilling process is in solution, and when clean water is not used as the working fluid. and the slurry solution of ZJ. However, the reliability of the known device deteriorates during impact-rotary drilling with the use of hydraulic percussion machines, as a result of which the hydraulic compression waves of the negative pressure propagate in the borehole medium. When this occurs, the penetration between the flaps of the diaphragm and pin, discharged from the surface on the cable and coupled with its tip to the contact socket of the device, separate solid particles into the contact area. These particles can get into the nest and cause deterioration of the contact of the downhole equipment with the communication line, which has a pin with the contact tip at the end. The aim of the invention is to increase the reliability of the contact operation in the process of percussion rotary drilling of small-diameter wells using hydraulic percussion machines under difficult conditions by preventing the penetration of the diaphragm penetrated between the valves 1 and the pin of individual solid particles into the contact area. This goal is achieved by the fact that a borehole contact device comprising a housing, a contact assembly disposed therein, a guide bush filled with a liquid dielectric and covered with an elastic diaphragm, is discharged with a hollow cylinder mounted with a gap in the guide bush over the contact assembly In the upper part, the cylinder has a rolling up to a diameter smaller than the diameter of the bore of the guide sleeve, but larger than the diameter of the discharged pin. The drawing shows the proposed downhole contact device. A housing 1 with a contact assembly placed therein, a socket 2 electrically connected to a face equipment (not shown), is located in the drilling screen 3. Above the housing there is a guide sleeve 4 which has openings 5 for the passage of working fluid. Above the sleeve there is a frame 6 with an elastic diaphragm 7 located at an angle to the vertical and consisting of two overlapping flaps. The diaphragm is attached to the frame with screws 8. A hollow cylinder 9 is installed in the lower part of the guide sleeve 4, clamped by its protrusion between the housing 1 and the sleeve 4, forming a trap with the inner surface of the last trap. two more guide bushings are installed to center relative to the projectile discharged from the surface of the cable with the communication line (not shown). All the free space of the contact device to the diaphragm is filled with a liquid dielectric. The device works as follows. When assembling the drill bit, in which the contact device is placed, the remnants of the adhered sludge and pieces of solid formations are removed from its inner walls. Getting on the diaphragm 7, they roll off it and through the through holes 5 of the frame 6 and the guide sleeve 4 of the lowering31

to the bottom, to the contact device. After assembling the entire projectile, the communication line with the contact pin at the end (not shown) is dropped into it. Spreading the flaps of the diaphragm 7, the pin falls into the guide sleeve 4, and the ball of its tip rests on the hemispherical surface of the socket 2. In this case, part of the liquid dielectric is forced out of the diaphragm flaps to the outside, and they tightly fit the surface of the pin. In the process of shock-rotational drilling with the use of hydraulic hammers, individual sludge particles, which appeared at the time of arrival of the compression wave on the diaphragm near the pin, can penetrate between the diaphragm flaps and the pin. The passage between the inner surface of the upper part of the guide sleeve 4 and the outer surface of the pin, the particles fall into the trap cavity between the inner, surface of the lower part of the sleeve 4 and the outer surface of the cylinder 9. This process is facilitated by pushing the pin into the specified cavity during drilling. They settle at the bottom of the trap, not falling into the contact area.

42354

The use of a hollow-rolled hollow cylinder in the device prevents the penetration of psham into the contact area during drilling with 5 using hydraulic hammers, ensuring reliable operation of the device.

Testing of the proposed device showed the reliability of its work. After testing, the device was disassembled, and its condition was examined. At the same time, penetration of the sludge into the contact area was not detected. Separate particles of sludge penetrated between the diaphragm flaps and the pin in the drilling process 15 fell into the trap and remained there until the device was lifted from the well to the surface, disassembled and removed 20 particles from the trap.

The proposed downhole contact device may be used

25 for transferring information from the surface to the surface, both during research works and for controlling bottomhole parameters when drilling wells in fairly complex conditions.

Claims (1)

A downhole contact device comprising a housing, a contact assembly disposed therein, a guide sleeve filled with a liquid dielectric and covered by an elastic diaphragm, a resettable pin, characterized in that, in order to increase the reliability of the contact during shock-rotary drilling using hydraulic percussion machines , it is equipped with a hollow cylinder installed with a gap in the guide sleeve above the contact · node, and in the upper part of the cylinder is rolling up to a diameter smaller than the diameter of the bore I have a guide sleeve, but more than the diameter of the drop pin.