RU2411344C1 - Device for screwing ball cock into wellhead of flowing well - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: device consists of mechanism of vertical transfer along flowing pipe. The mechanism has an upper and lower support rings fastened on the flowing pipe. Also, hydro-cylinders, installed between the support rings, vertically transfer a plate mounted on the upper ring. On the plate there are arranged a unit matching axes of the ball cock and the flowing pipe, a unit screwing the ball cock into a pipe coupling, a unit of control for opening-closure and a hydro-motor actuating them. A unit of axial transfer of the ball cock to the threaded section of the coupling consisting of a hydro-cylinder and a rod is positioned under the plate.

EFFECT: remote control of device operation facilitating high safety level for operating personnel; raised reliability of drill column sealing.

9 dwg

Description

The invention relates to the oil and gas exploration and exploration industries and is intended for the inversion of a ball valve on a drill pipe (tubing) when carrying out work to eliminate open well flowing.

The known design of "Installation for the guidance of a ball valve at the mouth of a gushing well" (1), comprising a housing in the form of a supporting frame, on which there is a unit for aligning the axes of the ball valve and the drill string, a mechanism for axial movement of the ball valve to the drill string, node for connecting the ball valve to drill string, as well as the mechanism for moving the bearing frame of the relative drill string. The installation is designed to provide the possibility of sealing the drill string at any location of its interlock above the wellhead.

The known installation has the following disadvantages:

- the design of the node connecting the ball valve to the drill string does not invert the ball valve into the drill collar lock, its sealing is ensured by a rubber sleeve put on the sleeve during axial movement of the ball valve. With, as a rule, contaminated outer surface of the coupling with drilling fluid, reliable sealing is almost impossible to provide. In addition, the rubber cuff, when combining the axes of the ball valve and the drill string, under the influence of a gushing well medium, has the ability to free itself from the mount, move to the top of its nest and not only not cover the surface of the drill collar lock, but also because damage, deteriorate. Only by directly turning the ball valve into the pipe coupling can it be reliably sealed;

- in the event of any malfunction of the installation, it is not possible to return the bearing frame to its original position for troubleshooting, since the mechanism for moving the bearing frame relative to the drill string ensures its movement only in one direction - up. Wedge pairs installed in the upper and lower split rings of the mechanism exclude the possibility of moving in the opposite direction;

- there is no possibility of closing the ball valve without direct access to it. When the drill joint drill joint is located at a height higher than human height from the level of the rig’s working platform, it is necessary to install additional support devices for approaching the ball valve control unit. In the conditions of gushing with possible ignition of the jet, manual control of the crane is associated with a high risk of danger to the life of direct performers from the operational brigade.

The aim of the invention is to achieve a higher reliability of the sealing of the drill (production) string during open flowing from it of the borehole medium with a high degree of safety for the life of the operating staff.

The goal is achieved by a device for inverting a ball valve at the mouth of a flowing well, including fixing elements of the device on the flowing pipe and a plate connected to them, on which a unit for combining the axes of the ball valve and gushing pipe is installed, a node for turning the ball valve into a pipe coupling, its control unit on closing-opening and a hydraulic motor, as well as an axial displacement assembly of a ball valve to the threaded part of the coupling, located under the plate, consisting of a hydraulic cylinder and a rod made with the possibility of axial movement under the action of the working medium, characterized in that the device includes a vertical movement mechanism along the flowing pipe in the forward and reverse directions, which consists of upper and lower support rings made of articulated semi-rings and pulled together by a single-acting hydraulic cylinder rod, and hydraulic cylinders are attached to the expanding half rings with the possibility of vertical movement of the plate mounted on the upper support ring, while the axle alignment unit the wound of the ball and flowing pipe, the knot for turning the ball valve into the pipe coupling and the control unit for closing-opening are combined with the hydraulic motor driving them into a single unit, which is installed on the upper end of the rod of the axial displacement unit of the ball valve (hereinafter referred to as KSh) .

Figure 1 shows a device placed on a pipe, a General view; figure 2 is a view of the device in arrow A of figure 1; figure 3 is a top view of the device along arrow B of figure 1; figure 4 - design of the mechanism of longitudinal movement along the drill pipe; figure 5 is a view of the support split ring of the mechanism of longitudinal movement along the drill pipe; in Fig.6 - the design of the support split ring in the cross section HH of Fig.5; in Fig.7 - enlarged, longitudinal section bb In Fig.1 with the nodes of the axial displacement of the KS, the combination of the KS axes and the drill pipe, the inversion of the KS and its control; in Fig. 8 is a cross-section G-G of the unit for aligning the axles of the shaft and the drill pipe of Fig. 7; Fig.9 is a cross section DD of the control unit KSH Fig.7.

A device for inverting a ball valve at the mouth of a gushing well (Fig. 1) comprises a mechanism for longitudinal movement of 1 through a drill pipe to a pipe rigidly fixed to it with a plate 2 on which a node 3 of axial movement of KSh 4 to the threaded part of the sleeve 5 of the drill pipe 6 is mounted. An assembly block 8 is mounted to the node 3 by bolted joints 7, consisting of a node for combining the KS axes and a drill pipe, a KS inversion unit and a KS control unit.

The mechanism of longitudinal movement along the drill pipe (Fig. 4) consists of an upper 9 and a lower 10 supporting split rings, to the expandable half rings of which rods and sleeves of two hydraulic cylinders 11 are attached.

The detachable support ring (Fig. 6) consists of two pivotally connected half rings 12, pulled together by a single-acting hydraulic cylinder rod 13. In a normal state, the half rings are spaced apart by a spring 14. In the inner bores of the half rings, crackers 15 with gears, removable for different diameters of drill pipes, are fixed a notch covering the outer diameter D of the drill pipe. On the surface E of the half rings (Fig. 5), threaded holes M are made for attaching to them the hydraulic cylinders 11 and the plate 2 of the device. When the working fluid is supplied under pressure along the pressure hose into the rod cavity of the hydraulic cylinder 13 (direction G), the half rings are pulled together, fixing the ring on the pipe.

The axial displacement node KSh 4 to the threaded part of the drill pipe sleeve (Fig. 7) consists of a single-acting hydraulic cylinder 16, the spring 18 acts on the rod 17. In order to neutralize the reactive torque that occurs when the shaft turns into the drill pipe sleeve, the rod 17 is made hollow with a hole of square cross section, into which a square rod 19 is inserted, fixed in the cylinder cover 16 with a bolt 20. When the working fluid is fed through the pressure sleeve into the rod cavity of the hydraulic cylinder (direction 3), the whole assembly is fixed ya to the upper part of the rod 17, moves down. After depressurizing the assembly under the action of the spring 18 returns to its original position.

As noted earlier, the nodes for combining the axles of the KS and the drill pipe, the inversion of the KS and its control are assembled in a single unit, and they are driven by one hydraulic motor 21. A pin 22 is mounted on its drive shaft with a gear 23 fixed by nuts 24. The pin is mounted bracket 25, the rotation of which around the pin is blocked by a spring clip 26. Axial movement of the bracket relative to the pin is prevented by two half rings 27, in the bores of which the bracket can be rotated around the axis by 90 ° in both directions until it stops milled paws in the fingers 28.

A bearing assembly 29 is mounted on the bracket 25, in which a sleeve 31 with a ball valve 4 is driven into rotation by a gear 23 and a gear wheel 30. A bevel gear 32 is fixed to the gear wheel 30, which engages with a bevel gear 33 mounted on the pin 34 and fixed nuts 35. The left end of the pin 34 is made in the form of a spike that fits into the groove of the control rotary element KSh.

The pin 22 and the bracket 25 with the latch 26 represent a node for aligning the axles of the KS and the drill pipe, the pin 22 with the gear pair 23 and 30 represent the KV inversion unit, the bevel gear pair 32 and 33 with the pin 34 is the KS control unit.

The combination of the KS axes and the drill pipe is made by turning on the hydraulic motor 21 with the direction of rotation of its drive shaft clockwise (view in I). The axle 22 with the gear 23 and the bracket 25 mounted on the hydraulic motor shaft, due to their engagement with each other by the latch 26, rotate around the axis in the T direction (Fig. 3). After turning through the angle φ and the stop of the milled paws of the bracket 25 with fingers 28 (Fig. 8), the bracket stops, thereby aligning the axle shaft and the drill pipe, and the pin 22 with gear 23, freed from the lock, continues to rotate under the action of the torque of the hydraulic motor shaft , leading the rotation of the gear 32 in the direction of inversion of the KSh.

KS control at the closing (opening) is carried out (Fig.9) due to the free rotation of the gear 30 in the opposite direction. Free rotation of the wheel 30 in the opposite direction is ensured by split rings 36 inserted into the cylindrical bore of its hole. The length of the split rings is selected in such a way as to provide rotation through an angle β, allowing rotation of the bevel gear 33 by 180 °, taking into account the gear ratio of the pair of gears 30 and 33, i.e. when the gear 33 is rotated 90 °, the crankshaft is closed; when the gear is rotated a further 90 °, the crankshaft opens.

Work with the device for the inversion of the ball valve at the mouth of the gushing well is carried out in the following order.

The assembled device is mounted by means of supporting split rings 9 and 10 of the longitudinal movement mechanism on the gushing drill pipe 6 (Fig. 4), and the pressure hoses of the device’s hydraulic system are connected to actuators. In the initial position, the KS axis is in a retracted state from the axis of the drill pipe by an angle of φ sufficient for unhindered movement along the pipe (Fig. 3).

By alternately supplying working pressure to the hydraulic cylinders of the support rings 9, 10 and hydraulic cylinders 11 in the directions Ж, К and Л (Fig. 4), the device is brought into position as far as the stop by the upper support ring in the lower end of the drill pipe sleeve. The upper ring 9 in this position is clamped by fixing the magnitude of the working pressure in the cavity of its hydraulic cylinder 13. When the hydraulic motor 21 is turned on (Fig. 7), the pin 22 with the bracket 25 rotates around the axis of the hydraulic motor shaft by an angle φ to the stop of the bracket paws in the fingers 28 and a combination of the axles of the KSh and the drill pipe is performed (Fig. 8). Further, under the action of a torque, the latch 26 releases the pin (at each of its turns) from engagement with the bracket 25, and the gear 23 rotates through the gear wheel 30 KS. By applying pressure to the cavity of the cylinder 16 in the direction Z, the rod 17 moves downward, and the crankshaft is inverted into the drill pipe sleeve. When the rotary gearbox reaches the final wrapped position, the pressure in the pressure lines 3 and the hydraulic motor is released, then the hydraulic motor is driven into reverse rotation of the shaft with the condition that the bevel gear 33 rotates 90 °, as a result of which the hydraulic cylinder is closed. Further work on the liquidation of the fountain is carried out according to the previously outlined plan.

In the event of unforeseen situations and the need to take additional steps to commission or troubleshoot at any stage of the work with the device, the operations are carried out in the reverse order and return it to its original position.

Information sources

1. Copyright certificate of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR No. 1705546, January 30, 1990

Claims (1)

A device for inverting a ball valve at the mouth of a flowing well, including fixing elements of the device on the flowing pipe and a plate connected to them, on which a unit for combining the axes of the ball valve and gushing pipe is installed, a node for turning the ball valve into the pipe coupling, its control unit for closing-opening and a hydraulic motor, as well as an axial displacement assembly of the ball valve to the threaded part of the coupling, located under the plate, consisting of a hydraulic cylinder and a rod made with the possibility of axial displacement under the action of a worker medium, characterized in that the device includes a vertical movement mechanism along the flowing pipe in the forward and reverse directions, which consists of upper and lower support rings made of articulated semi-rings and pulled together by means of a single-acting hydraulic cylinder rod, and attached to the expanding half rings hydraulic cylinders with the possibility of vertical movement of the plate mounted on the upper support ring, while the node alignment of the axes of the ball valve and gushing t the pipes, the ball valve inversion unit into the pipe coupling and its closing-opening control unit are combined with the hydraulic motor driving them into a single unit, which is mounted on the upper end of the rod of the ball valve axial movement unit.

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