Cable adapter sub

FIELD: drilling equipment, particularly cable television system used to perform navigational control of directional and horizontal oil and gas well drilling from ground surface and to guide borehole cable rope from inner cavity out of drilling string.

SUBSTANCE: sub comprises threaded connection pipe with thrust end, body with straight and peripheral inclined channels, bush and annular sealing member arranged in straight body channel. Straight body channel is central and provided with cup with inner and outer longitudinal grooves. The bush is installed so that the bush may cooperate with thrust end of threaded connection pipe and has longitudinal extensions arranged in inner longitudinal cup grooves. Annular sealing member comprises extension having orifice and cut for cable introduction into the orifice. The extension is arranged in peripheral inclined channel of the body. Safety means formed as reinforcing member facing straight channel and as elastic member with orifice and cut for cable introduction and arrangement is installed at inclined channel inlet.

EFFECT: increased service life, ease of sub operation and repair.

3 cl, 4 dwg

 

The invention relates to the field of drilling equipment and includes, in particular, in the composition of the cable telemetry system for navigation control surface for drilling directional and horizontal oil and gas wells and is used to transfer the logging cable of a cable from the internal cavity of the string of drill pipes.

Known cable subs, built-in swivel, cable subs, installed directly in the string of drill pipes as an integral part of its composition (Kalinin A.K. and other Drilling inclined and horizontal wells. The Handbook. "Nedra", M, 1997, s-395).

First do not provide a reliable tolerance descent device to the landing device located in a horizontal and in some directional sections of the wells. The latter is more convenient when assembling, preparation for life and work, because when you are directly over the mouth of the well.

Known cable sub mounted in the string of drill pipe, which serves to seal the cable during transportation suspended to him of the instrument, the descent to the bottom of the borehole through the string of drill pipe by the flow of drilling fluid supplied by the drilling pump (Kritsonis VP, Elders S.A. hardware Set FCS-G. NTI Exploration and conservation". "Nedra, M., 1991, No. 7, p.6-8).

Is this the sub out of the socket in the form of the discharge chamber of the housing, the sealing device and the side of the inlet nipple for connection to the manifold mud pump. The sealing device includes a rubber sealing collars, biasing spring, and serves to seal the cable when hydrocotyle device under the pressure of 10-15 kgf/cm2and feed no more than 2 l/s in shallow (up to 300 m) and small diameter (46 mm) exploration wells drilled from the surface and from underground workings on the deposits of coal and other minerals. The sealing device and the cable placed in the Central channel of the body of the sub, and the flow of drilling fluid through the channel side of the inlet nipple.

This sub does not provide sealing rope in the process of drilling oil and gas wells downhole motors with simultaneous circulation of the drilling fluid at an operating pressure of up to 50 to 70 kgf/cm2. With it only work when it is on the surface. Such cable subs not meet the requirements of drilling horizontal and directional oil and gas wells using telemetry system for navigation control surface for the drilling process.

The closest in-the th essence and the achieved result is produced by domestic industry cable sub PC1-A (Sub cable PC1-A. The passport. Pilot plant of drilling equipment, , Kotovo, 2002).

It consists of a threaded pipe connected to the casing of the screw cap. Inside the housing are offset from the Central axis of the cable sub rectilinear channel for accommodating a sealing device and two side bypass channel of small diameter for drilling mud circulation. The sealing device consists of a seal made in the form of a package of flat sealing rings with through the inner hole wireline and slit slits (cut thin blade of a sharp knife) for cable entry. On the package and under it installed disks consisting of two palutikof.

O-ring clamp with slotted nuts and center hub with an axial hole and thus seal at the same time the logging cable and the inner wall of the hull of the sub. Fastening the cable carry a pair of collets, clampable in a conical Central bore of the sleeve. O-rings and collets in the Assembly of the cable sub select in field conditions on the diameter of the bore hole corresponding to the diameter of the wireline, currently in use.

Circulation of drilling fluid through the side obwodnica, located in a threaded socket in the housing and interconnected bushings with rubber o rings.

This cable provides sub landing measuring device in the landing gear TeleSystems, when this device is located at a certain depth in the vertical section of the well. The mounting and sealing of the cable as it is drawn from the drill string into the annulus carried out in cable sub over the mouth of the well. Delivery measuring device for inclined and horizontal trunk exercise jointly with landing gear by increasing the drill string above the cable sub and its descent into the well to the bottom.

Such a cable crossover is used for drilling oil and gas wells downhole motors with cable networks when applying mud 25-30 l/s working pressure of 50 to 70 kgf/cm2.

A significant disadvantage of this cable sub is that the core cross-sectional area of the body takes it straight channel with a sealing device, and the openings for the circulation of drilling mud is made in the form of side bypass channels of small diameter with thin bridges between them due to limited free cross-sectional area to the pus. Because of the technological gaps between the connecting bushings, threaded pipe and the housing, and displacement of the axes of the circulation holes profile bypass channels has a sharp (or flash) expansion, contraction and rotation of the mud flow, which is accompanied by intense videoposobiyami and phenomena of cavitation along the channel and at the outlet of the hoist cable from under the sealing device. All of this causes additional losses in the circulation system, intensive abrasive wear and cavitation erosion of the wireline and walls restricting the flow. The offset of the straight channel relative to the Central axis of the cable sub limits, in addition, the length passed through it to the inside of the drill string instrument with sensor networks. During operation, there are cases flushing of the side walls of the bypass channels inside the straight channel with a sealing device. Is the depressurization of the cable sub, which, incidentally, is difficult to detect from the surface in the drilling process. This leads to flushing cable sub, damage to expensive kilometers of logging cable and unscheduled forced lifting of the entire drill string Assembly for the replacement or repair of the sub or cable.

Great inconvenience causes the need for selection in the field of sealing rings and Tsang, because it forced to have them on the rig in sets, which differ in the diameter of the bore hole the appropriate cable.

When assembling the cable sub with a logging cable over the mouth of the well because of the asymmetrical relative to the center of gravity position of the bushings connecting the lateral by-pass channels, threaded pipe and casing warp, which often leads to slice the rubber o-rings in these bushings and depressurization of the sub on the surface.

After lifting cable sub out well for disassembly and release of the wireline unable to retrieve package sealing rings are pressed by the pressure of the drilling fluid during operation in the well. This causes certain difficulties and require additional time on the release cable. When repairing a cable sub cannot retrieve sleeve with o-rings remaining in the threaded socket in the housing after separation of the sub.

No, in addition, protection of the hoist cable from damage if the output cable from the sub in the annulus. This leads to the waists, abrasion and other damage to the cable.

Such to belinya subs short-lived, especially when downhole drilling motors (large diameter 240 mm), requires elevated (up to 50 l/s) feed of mud, inconvenient operation, maintenance and repair.

The claimed invention is directed to a solution to increase durability, ease of use, maintenance and repair of cable adapters.

For this cable in the sub containing a threaded nozzle with thrust face, the body is straight and inclined peripheral channels, bushing and o-ring placed in the straight channel case, the straight channel of the body is Central, it placed a glass with inner and outer longitudinal grooves, a sleeve mounted for engagement with the thrust end of the threaded pipe and is designed for horizontal tabs in the internal longitudinal grooves Cup, o-ring seal is made with the tab having a hole and a slot to put in the hole of the cable and located in the peripheral inclined channel case, the output of which have the fuse in the form of reinforcing element facing the straight channel, and an elastic element with a hole and a groove for placement and cable entry.

In addition, the sleeve has a limiting ring, inserted through the locking bolt is in its longitudinal edges, moreover, the restrictive ring at the entrance of the mud flow has a rounded inside edge radius (0.1 to 0.2) d, where d is the diameter of the inner bore hole spacing rings and the output is a cone with a cone angle in the range 4-10°.

In addition, the upper end of the sleeve is made with internal thread, the lower end of the threaded pipe is made with two cylindrical protrusions, one of which has a hard edge and is placed in the interval of the internal thread of the sleeve, and the other is placed on the outer surface of the sealing ring grooves.

The cable is removed from the string of drill pipes to the peripheral inclined channel through the hole in the protrusion of the seal in alignment with the hole of the elastic element fuse that provides reliable protection against damage.

The internal thread of the sleeve is designed to attach a device that extracts during disassembly of the housing sub kit, and release cable.

A threaded socket in its lower part has a hard edge on a cylindrical projection, which when interacting with the sleeve during Assembly of the cable sub deforms the seal. The internal thread of the sleeve is protected from abrasive drilling fluid sealing rings in the grooves of the cylindrical speaker is and threaded pipe.

The Central position of a channel for circulation of drilling fluid, straightforward, its execution and the corresponding formation of the flow at the inlet and outlet of the restrictive ring ensures durability of the cable sub at elevated (up to 50 l/s) of the flow rate of the drilling fluid and the pressure to 100 kgf/cm2.

When assembling the cable of the sub in the enclosure screw threaded sleeve and deform the seal. Due to the axial deformation of the seal seals the cable and seals the walls of the Central rectilinear and inclined peripheral channels in the hull of the sub. The sealing ring threaded pipe to prevent the flow of drilling mud in the annulus in circulation during the drilling process. The fuse protects cable from abrasion and damage on the threads of the pipe and the walls of the inclined peripheral channel in the housing above the seal when the output cable from the sub in the annulus. The groove in the elastic element fuse provides free entrance and placement of the cable in the hole of the elastic element, and the restrictive ring sleeve prevents the folding inwards of its longitudinal edges and loss of contact retaining bolts with a glass during the next extraction of body parts, including seals, sticking to the walls of the building is and the cable sub axial deformation under pressure of drilling mud in the well.

Fillet inside face of the bounding ring of radius within the specified limits significantly reduces losses due to reduction or complete elimination of the compressed section of the transit of the jet flow of the drilling fluid inside the ring.

In the cone with a cone angle within the specified limits do not occur transit jets of drilling fluid from the walls of the diffuser and not having the associated vortex zone and cavitation reduces losses during circulation of the drilling fluid. This prevents the cable from the local damage at the exit of glass inside the cable housing of the sub.

The invention is illustrated by drawings, where figure 1 shows a General view of the cable sub in longitudinal section; figure 2 is a top view of the arrow "a" of figure 1; figure 3 - fuse; figure 4 is a top view in direction of arrow "B" figure 3.

Cable crossover includes a housing 1 with a Central rectilinear 2 and a peripheral inclined 3 channels and a threaded socket 4. The sleeve 5 is placed inside the annular seal 6 and the glass 7 and all together are placed in the Central rectilinear channel 2 of the housing 1. The Cup 7 has an inner 8 and outer 9 longitudinal grooves. One of the outer longitudinal grooves 9 is made shorter to accommodate the finger 10 (shown in this place conditionally), and the second outer longitudinal groove 9, with protivopul is mportant part, made a solid for the placement of cable 11. The cable 11 is fixed against axial displacement in the solid outer longitudinal groove 9 of the Cup 7 with the clamp 12 and the threaded tube 13 with the sealing ring 14. Seal ring 6 has a protrusion 15 with an opening 16 and a slot by slot 17 under the cable 11, located in the peripheral inclined channel 3 of the housing 1. The lower end of the threaded tube 4 has two cylindrical protrusions 18 and 19. A cylindrical protrusion 18 is placed in the interval of the internal thread 20 of the sleeve 5 and has the axial end face 21 for engagement with the latter. The sleeve 5 has a longitudinal protrusions 22 placed in the internal longitudinal grooves 8 cups 7. A cylindrical protrusion 19 is placed on the outer surface of the groove 23 under the sealing ring 24. Restrictive ring 25 by means of the clamping bolts 26 secured to the longitudinal edges 22 of the sleeve 5. Restrictive ring 25 at the entrance of the mud flow has a rounded inside edge radius (0.1 to 0.2)d, where d is the diameter of the inner bore hole of the bounding ring 25, and the output is a cone with a cone angle in the range 4-10°. In the upper portion of the peripheral inclined channel 3 output in the annulus have the fuse in the form of reinforcing element 27, addressed to the Central rectilinear channel 2, and the elastic is of lamenta 28 with an opening 29 and groove 30 for placement and input cable 11.

The principle of operation of the cable sub is as follows. After descending part of the drill string into the well to the desired depth in it, screw the housing 1 cable sub. Through a Central rectilinear channel 2 of the housing 1 inside the drill string on the cable 11 is lowered measuring device before planting it in a landing site TeleSystems (not shown). After that, the cable 11 through the slit, the slit 17 is injected into the hole 16 of the projection 15 of the ring seal 6, assembled complete with sleeve 5, the glass 7 and the restrictive ring 25. Then the Assembly together with the cable, insert the cable inside of the sub protrusion 15 of the annular seal 6 in the peripheral inclined channel 3 of the housing 1. Using the latch 12 and the threaded tube 13 fasten the cable 11 in the housing 1 against axial displacement. Next, install the fuse and screw threaded socket 4. Due to the stroke of the thread of the threaded socket 4 o-ring 6 with the tab 15 is deformed and compacted cable 11, the outer wall of the sleeve 5 and the inner wall of the Central rectilinear 2 and a peripheral inclined 3 channels of the housing 1. From abrasion and damage of the peripheral wall inclined channel 3 in the housing 1 and the screw thread of the socket 4, the cable 11 is protected by a fuse. After this cable sub ready to provi is of the drill string and further its descent into the well.

When drilling circulation of the drilling fluid is carried out by the Central rectilinear channel 2 bushing 5 cable sub and next to the bit and the borehole bottom. While the profile of the inner bore hole of the bounding ring 25 forms a flow of drilling fluid in the cable sub and protects the cable 11 from local damage.

After another chipping and lifting tool with cable sub to the surface for release of the cable 11 Unscrew the threaded socket 4, vivencial threaded tube 13 and remove the retainer 12. Using tool (not shown)mounted on the internal thread 20 of the sleeve 5, remove the sleeve 5 together with a glass of 7 and an annular seal 6. This restrictive ring 25 does not provide longitudinal protrusions 22 of the sleeve 5 to form inside and lose touch with the glass 7. This prevents unintentional disconnection of the recoverable items and leaving some of them in the enclosure 1 cable sub.

1. Cable sub containing a threaded nozzle with thrust face, the body is straight and inclined peripheral channels, bushing and o-ring placed in the straight channel of the housing, characterized in that the straight channel of the body is Central, while it posted a hundred is an inner and outer longitudinal grooves, sleeve mounted for engagement with the thrust end of the threaded pipe and is designed for horizontal tabs in the internal longitudinal grooves Cup, o-ring seal is made with the tab having a hole and a slot to put in the hole of the cable and located in the peripheral inclined channel case, the output of which have the fuse in the form of reinforcing element facing the straight channel, and an elastic element with a hole and a groove for placement and cable entry.

2. Cable sub according to claim 1, characterized in that the sleeve has a limiting ring by the clamping bolts on its longitudinal edges, and the restrictive ring at the entrance of the mud flow has a rounded inside edge radius (0.1 to 0.2)d, where d is the diameter of the inner bore hole spacing rings and the output is a cone with a cone angle in the range 4-10°.

3. Cable sub according to claim 1, characterized in that the upper end of the sleeve is made with internal thread, the lower end of the threaded pipe is made with two cylindrical protrusions, one of which has a hard edge and is placed in the interval of the internal thread of the sleeve, and the other is placed on the outer surface of the sealing ring grooves.



 

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