RU2704498C1 - Method to restore gate valve passage channel to wellhead - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas production and geological exploration and is intended for coaxial alignment of valve gate opening axes and its passage channel at elimination of emergencies at wells. Proposed method comprises assembling flanged case of flush valve in housing flange accommodating cylindrical rod displaced along axis and rotated by hand drive. Tool for machining high-strength alloys is installed on stock. Around the rod there is a hollow lead screw with the possibility of movement along the housing axis and rotation. Lead screw and the cylindrical rod are rotated about their axes together or by hand wheels separately installed at their ends. On wedge end special wedge is mounted, lowered into cavity of emergency gate valve, rod is lowered till stop of special wedge into damper gate. In the presence of a gap between the walls of the gate hole and the passage channel of the gate valve, a special wedge is introduced into the gap and the gate is moved towards the opening side. In the absence of a gap, in case of complete shutoff of the gate, it is drilled through the center of the well axis with a tool for processing high-strength alloys in the form of a drill for preparation of a bearing surface, replaceable drill bit prepared by assembly of two wedges connected to each other and having the ability to act on support surface and shifted in grooves relative to each other, made from rolled products of round cross-section with diameter, applying force on upper wedge, moving lower wedge brought in contact with drilled shutter in horizontal direction with formation of clearance between walls of gate hole and gate passage channel, assembly of wedges is removed, special wedge is installed, its sharp end is introduced into formed gap, gate is brought into state of complete opening.

EFFECT: higher reliability, possibility of monitoring and control.

1 cl, 6 dwg

Description

The invention relates to the oil and gas exploration and exploration industries and is intended to restore the alignment of the axes of the valve gate openings and its passage channel when performing emergency response work at the wells, for example, to replace the faulty main valve of the fountain valves with existing devices for changing the shutters of the wellhead equipment under pressure without killing the well, a prerequisite for the fulfillment of which is to have a fully open echeniya channel well to enter into the barrel packer element.

During the long-term operation of the well, there may be disturbances in the operability of the root valve of the wellhead equipment, expressed in the absence of the possibility of closing or opening it, either partially or completely, due to jamming of the gate inside the valve cavity. The most problematic malfunction in such cases is a rod breakage the drive of the gate when it is fully closed, which leads to uncontrollability of the well and cessation of operation with the unconditional transfer of it to the state of capital repair.

There is a method of opening the gate valves of shutoff valves, carried out by the creation of a directed explosion (1), after which all repair work is carried out only after killing the well. However, the application of this method can lead to an unpredictable technical condition of the well after a directed explosion carried out inside its channel, while restoring the productivity of the well after killing it is a long-term and costly process.

There are also devices for drilling the walls of gas processing equipment under pressure (2), (3), (4), having similar designs with each other, including a housing, a spindle, a rod with a tool, helms for their rotation, a connecting bearing flange, sets of transitional flanges for connection to gate valves of various standard sizes. Among the technological operations performed by these devices, it is possible to drill gate valves, however, the set parameters for a number of drilling diameters (18, 30, 36, 42 mm) do not satisfy the necessary requirements for ensuring a full passage in emergency valves (50, 65, 80, 100, 150 mm), since the packing elements available in the set of devices for changing gate valves under pressure are made specifically for these diameters.

The aim of the invention is the implementation of the restoration of the passage channel of the valves in the state of partial or complete closure of its gate and the lack of controllability of its position due to the breakage of the actuator stem.

This goal is achieved by a device for restoring the passage channel of the valves at the wellhead, mounted on the flange of the gates of the fountain valve, consisting of a housing inside which a hollow spindle with a cylindrical rod inserted inside it, driven, both together or separately, into rotation around its axes with helms installed at their ends, characterized in that it is equipped with a special wedge mounted on the end of the rod, lowered into the emergency cavity valves, by means of which the unmanaged gate is forcedly moved, in the position of its channel partial opening to the fully open position, and the gate is forcedly moved if it is completely closed after it has been drilled through the center of the borehole axis with a tool installed on the rod for processing high-strength alloys with the purpose of preparing the supporting surface, which, subsequently, is affected, is replaced instead of the drill, a prepared assembly of two x, interconnected and having the ability to move along the grooves relative to each other, wedges made of rolled round diameter with a diameter that allows them to move freely in the valve channel with a minimum clearance, while the vertical force applied to the upper wedge moves brought into contact with drilled by the gate, the lower wedge in the horizontal direction, shifting it towards the opening direction and, at the same time, forming a gap between the walls of the gate opening and the gate passage channel, after which a special cl Mr set to replace the extracted wedge assembly, and introduced its sharp end into the resulting gap in the gate is fully opened.

The design of the device is shown in FIG. 1, in FIG. 2 - the position of the special wedge in the valve after it is inserted into the gap between the walls of the gate opening and the borehole channel; in FIG. 3 - the same after restoring the position of the gate in the fully open state of the valve; in FIG. 4 - assembly of wedges fixed in the initial position of the components with a spring-loaded clamp; in FIG. 5 - the position of the assembly of the wedges in the valve after it is planted in the hole drilled in the gate; in FIG. 6 - the same after applying the force P to the upper wedge.

The device consists (Fig. 1) of the housing 1, on one end of which a flange 2 is screwed on the conical thread with a pressure monitoring unit 3 mounted on it with a pressure gauge and a needle valve, and on the other end, also on the conical thread, clutch 4 is screwed on, inside of which the hollow spindle 5 can move along the trapezoidal axis along the axis when it is rotated by the steering wheel 6. In the cavity of the spindle 5 there is a rod 7, which can only rotate around its axis when turning pieces shaft 8 because the axial movement of the rod relative to the screw shaft 9 is blocked by the spacer 10 and the thrust bearing with a bearing sleeve 11. The value of L chosen length of the hull at the design value with a view to ensuring the necessary displacement H of the lead screw in the cavities valves maximum size in the region served.

The device is equipped with special wedges 12 and adapter flanges 13 for working with gate valves of different sizes, special drills equipped with hard alloy plates for drilling gates (not shown in the figure), as well as sets of assemblies of two interconnected and able to move in grooves , relative to each other, wedges consisting of an upper wedge 14 and a lower 15, fixed to each other by a spring-loaded clamp 16 (Fig. 4).

The principle of operation of the device is as follows.

Before its intended use, it is pressed with excess pressure in accordance with the requirements of the instructions for its use and, in the event of pressure leaks, measures are taken to eliminate them.

A special wedge is mounted on the device’s spindle, and an adapter flange is installed on the connecting flange, which corresponds to the size of the valve’s size, after which the device is installed on the upper flange of the wellhead working valve.

The working valve is opened and the absence of pressure leaks of the borehole medium is monitored through the device’s sealing nodes, if they are detected, measures are taken to eliminate them, after which, by turning the helm 6, lower the rod all the way to the stop of a special wedge 12 into the main gate valve, the degree of opening of which is unknown. When the steering wheel 8 rotates slowly, while the spindle 5 is pressed by the steering wheel 6, the wedge 12, rotating around its axis, “feels”, if any, the gap h between the walls of the gate opening and the gate passage channel and, narrowed by its end, will be embedded in this the gap (Fig. 2). Further slow, with slight swaying left-right rotation of the steering wheel 8, while pressing the steering wheel 6 at the same time, will move the gate to the opening direction until the cylindrical part of the wedge 12 enters its hole, as a result of which its axis will completely coincide with the axis of the passage channel wells (Fig. 3).

The absence of vertical movement of the spindle 5 during the rotation of the steering wheel 8 indicates that the expected clearance h does not exist, i.e. the gate is in the fully closed position. In this case, the device is dismantled, a special wedge is replaced with a drill and, after its repeated installation, a through drilling of the gate with a diameter d1 is performed, thereby forming a supporting surface (hole d1) for contact with the lower wedge of the wedge assembly (Fig. 4). The drill is replaced by the assembly of wedges corresponding to the valve of the standard size, while orienting the angle of inclination of the wedges in the direction of horizontal movement of the gate of the valve, visually fixing with a mark on the helm handle 8, and lowering it to the end of the lower wedge in the gate with the inlet of the lower wedge pin made with a diameter of d1-1 mm, in the hole d1 (Fig. 5). The steering wheel 6 exerts a force P on the upper wedge of the assembly, from which the lower wedge, arising by the force F, moves, using the trunnion on the walls of the hole d1, the gate valve in the opening direction, thereby forming a gap S between the walls of the gate passage hole and the gate passage channel ( Fig. 6). The assembly of two wedges is replaced with a special wedge and the axes of the gate openings and gate valves are combined using the method described above for FIG. 3.

The device was tested in workshop and field conditions at the Orenburg gas condensate field.

Information sources

1. "The method of opening the gates of valves", patent for the invention No. 2190752, 10.10.2002,

2. "Device for drilling equipment under pressure", patent for the invention No. 2217269, 11/27/2003

3. "The device drilling and milling USF", patent for the invention No. 2309821, 10.11.2007

4. "Device for drilling holes under pressure USO-70", patent No. 2603413, 02/02/2016

Claims (1)

A method of restoring a valve passage channel, including mounting on a valve flange of a body fountain valve, inside which a cylindrical rod is installed, which is moved along the axis and rotated by a manual drive, while a tool for processing high-strength alloys is installed on the rod, characterized in that the hollow the lead screw with the ability to move along the axis of the housing and rotation, the lead screw and cylindrical rod are rotated around their axes together or separately installed with control wheels at their ends, a special wedge is mounted on the end of the rod, lowered into the cavity of the emergency valve, lower the rod all the way to the stop of the special wedge in the gate of the gate, if there is a gap between the walls of the gate opening and the passage channel of the gate, they introduce a special wedge into the gap and move the gate to the side openings, in the absence of a gap, in the case of a complete shutter closure, drill through it in the center of the axis of the well with a tool for processing high-strength alloys in the form of a drill to prepare the supporting surface replace the drill with a prepared assembly of two wedges interconnected and able to act on the bearing surface and move along grooves relative to each other, made of rolled round section with a diameter that allows them to move freely in the valve channel with a minimum clearance, exert an effort on the upper wedge, moving the lower wedge brought into contact with the drilled gate in the horizontal direction with the formation of a gap between the walls of the gate opening and the gate passage channel, from attract assembly of wedges, install a special wedge, insert it with a sharp end into the formed gap, bring the gate into a state of full opening.

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