RU2236552C2 - Device for pressure testing tubing test x-mas tree - Google Patents

Abstract

FIELD: oil and gas extractive industry.

SUBSTANCE: device has body and packer and is provided with pallet, bushing with guiding dowel which is placed and fixed in the body, pipe with pressurization assembly. Body is made with flange for mounting on flange of buffer latch, and with nut having square shelf for its rotation by steering wheel. Inside the body with a nut a screw with a rod is placed with possible axial movement during rotation, having dowel groove enveloping guiding dowel of bushing. Packer has screw with rectangular shelf and is connected to screw with rod. Inside the screw with rod a bar with rectangular sample is mounted, which sample envelops rectangular shelf of packer screw for transferring torque during bar rotation. Pipe with pressurization assembly is placed on the side of flange of body and serves for directing and pressurizing screw with rod. In the body through drillings are made with threaded apertures for filling above-packer hollow of tubing test X-mas tree with pressure testing liquid and for transfer of pressure-testing pressure to it. Pallet envelops the body and is placed below said apertures of body for receiving pressure testing liquid and transferring it through said apertures into channels of tubing test X-mas tree latches. Body nut, packer screw and bar are provided with stopping ball-bearings. Device is provided with packer location sensor and nut, fixed on the end of screw with rod, while packer location sensor is made for possible mounting on the end if said nut.

EFFECT: use of device provides for performing pressure testing of tubing test X-mas tree of operation wells of gas and oil deposits without their stopping.

3 cl, 5 dwg

Description

The invention relates to the oil and gas industry and is intended to provide the possibility of crimping the fountain "Christmas tree" of the wellhead equipment of the production well without killing it.

A device for crimping wellhead equipment together with the wellhead part of the casing (invention according to the patent of the Russian Federation No. 2152506), the wellhead packer consists of a housing, a seal assembly and a liner.

However, when using the wellhead packer, mandatory shutdown of the well and its killing are necessary.

The main objective of the invention is to provide the possibility of crimping the "Christmas tree" of the wellhead equipment of the production well without killing it.

The solution to this problem is achieved by installing a packer in the channel of the head of the tubing without killing the well using a crimping device, including a housing and a packer that is equipped with a pallet, placed and secured in the housing by a sleeve with a guide key, a pipe with a sealing unit, while the housing made with a flange for mounting on the flange of the buffer valve and a nut having a square protrusion for its rotation by the helm; inside the housing with the nut is placed with the possibility of axial movement during When connecting the nut, a screw with a rod having a keyway covering the guide key of the sleeve, the packer has a screw with a rectangular protrusion and is connected to a screw with a rod, a rod with a rectangular selection is located inside the screw with the rod, covering the rectangular protrusion of the packer screw to transmit torque during rotation of the rod , a pipe with a sealing unit is placed on the side of the housing flange and serves to guide and seal the screw with the rod, and through-hole drilling with threaded holes for filling are made in the housing of the overpacker cavity of the fountain “Christmas tree” with pressure fluid and transferring pressure into it, and the pallet covers the body and is located below the said openings of the body for receiving the pressure liquid and its transmission through the said openings of the body into the valve channels of the fountain “Christmas tree”, while the body nut, screw the packer and the rod are equipped with thrust bearings.

In addition, the device is equipped with an indicator of the position of the packer and a nut mounted on the end of the screw with the rod, while the indicator of the position of the packer is configured to be installed on the end of the nut.

When diagnosing the technical condition of fountain "Christmas trees" of wells that are subject to the corrosive effects of the produced products, the final stage is the pressure test (crimping) of the wellhead equipment.

The proposed technical solution allows this process to be carried out without killing production wells and dismantling the Christmas tree in gas, gas condensate and oil fields, as well as wells in underground gas storages.

Figure 1-5 shows the design of the device, including figure 1 - General view; figure 2 - housing with a nut; figure 3 - screw with a rod; figure 4 - packer; figure 5 is a pointer to the position of the packer.

The device consists of the following main components: a housing with a nut, a screw with a rod, a pallet and a helm.

The housing with the nut 1 and the clamp 2 provide the possibility of mounting the device with a lifting device flange for installation on the flange of the buffer valve. A housing with a nut 1 places a screw with a rod 4 inside. The nut 5 is equipped with thrust bearings 6 and has a square protrusion for rotation by the control wheel 7 of the device. In the housing 1, through drilling with threaded holes is made to fill the nadpakarny cavity of the fountain "Christmas tree" with a compression fluid and transfer the pressure to it. The pipe 8 with the sealing unit 9 is placed on the side of the flange of the housing 3 and serves to guide and seal the screw with the rod 4 and rod 10.

The screw 11 and the rod 10, screwed together and locked by the screw 12, provide, when the nut 5 is turned by the control wheel 7 of the device, the axial movement of the packer 14 connected to it by the nut 13 through the channels of the stem valves of the fountain “Christmas tree” is provided due to the fact that the screw 11 is provided with a keyway, covering the guide key 15, mounted in the sleeve 16, placed and fixed in the housing 1.

Packer 14 provides sealing of the passage channel of the head (suspension) of the tubing located in the adapter of the pipe head. The sealing of the channel of the head (suspension) is carried out by overlapping the gap formed by the rod 17 of the packer 14 and the inner surface of the channel of the head, the body of the rubber seal 18, located between the nut 19 and the washer 20.

The packer 14 has a screw 21 with a rectangular protrusion and is connected to the screw with the rod 4, a rod 25 with a rectangular selection is located inside the screw with the rod 4, covering the rectangular protrusion of the packer screw for transmitting torque when the rod 25 is rotated. The packer screw 21 and rod 25 are equipped with thrust bearings 23 and 36, respectively. The housing 22 of the packer 14 is provided with a connecting thread for connection to a screw with a rod 4 by means of a nut 13 with locking screws 24.

In addition, the device includes a tray 26 and a position indicator for the packer (see figure 5).

The pallet 26 covers the housing 1, is located below the through holes with the threaded holes of the housing and provides the reception of the crimping fluid and its transmission through the said openings of the housing into the channels of the gates of the fountain “Christmas tree”.

The indicator of the position of the packer (see figure 5) provides the ability to control the position of the packer 14 when it is axially moved along the channels of the stem gate valves and is mounted on the end of the nut 27 fixed to the end of the screw with the rod 4 with the hole of the strap 28. The strap 29 indicates the position of the packer collars 14, and the strap 30 is the position of the end face of the nut 19 of the packer 14.

Operating procedure

Close gate valves, main stem and string from the side of the loop. Discharge the Christmas tree to zero on the flare line (barn). Verify that there are no fluid passes through the gate valve. Close the extreme string valve of the flare line.

When crimping a fountain tree with a pressure exceeding the operating passport pressure of the valves, the extreme string valves must be open and drowned by blank flanges.

Mount a work platform with a ladder at the wellhead. In this case, the platform should be located at the level of the upper flange of the buffer valve.

Dismantle the flange with the quick-connect coupling and the load-lifting mechanism from the buffer valve; mount the device on its flange.

Before mounting the device on the buffer gate valve flange, make sure that the packer reach from the body flange 3 is less than the distance from the upper buffer gate flange to the main gate gate.

When mounting the device, its axis must coincide with the axis of the fountain tree.

Tighten the flange connection of the device body 3 and the buffer valve.

Attach pressure gauge 32 to needle valve 31.

Open the main valve until the hole in the gate coincides with the valve passage channel and, according to the pressure gauge 32, make sure that there is pressure of the well fluid in the internal cavities of the fountain tree and the device. In this case, there should not be fluid passes through the gasket of the flange connection of the body and the buffer valve and the seal of the device. If gaps appear, take measures to eliminate them. The main valve should be closed, and there should be no pressure in the internal cavities of the fountain tree.

Rotating the device’s control wheel counterclockwise, introduce packer 14 into the packer place. In this case, the movement of the packer 14 along the trunk of the fountain tree is controlled by a pointer to the position of the packer (see Fig. 5), setting it with the hole of the strap 28 on the end of the nut 27.

During the rotation of the steering wheel, it is necessary to constantly monitor the applied force to the handles of the steering wheel 7. When the force increases (locking the packer 14 in the passage channel of the gate valves), the supply of the packer 14 to the trunk of the fountain tree should be stopped immediately and returned to 5 ... 10 mm back (1. ..2 turn the steering wheel clockwise).

Further operation of the device is possible only after eliminating the causes of locking.

Rotating the rod 25 by its hexagon clockwise, squeeze the rubber seal 18 of the packer to tangible resistance to rotation, counting the number of completed revolutions. Using a valve of the needle valve 31, release pressure in the internal cavity of the fountain tree to zero. Close the tap of the needle valve 31 and make sure that there is no increase in pressure according to the manometer 32. If pressure appears, continue to compress the rubber seal 18 of the packer 14.

Check the absence of pressure on the gauge 32 of the device for 10 ... 15 minutes.

Unscrew the conical plugs 33 and 34 from the shoulders of the housing 3 of the device.

Fill the internal nadpakarny cavity of the fountain tree with pressure fluid to completely remove air.

Screw conical plugs 33 and 34 into the threaded holes in the housing 1 of the device.

Connect the crimping station to the quick release coupling 35 of the device.

Load the overpacker cavity of the fountain tree with pressure and time according to the approved work plan for crimping the fountain tree of a particular well.

After crimping the fountain tree with hydrostatic pressure, the valve of the needle valve 31 depressurizes the fountain tree to zero. Close the needle valve tap 31.

Open the extreme flap line valve.

Rotating the rod 25 counterclockwise, depressurize the place of packing and squeeze out the pressure fluid from the overpacker cavity through the string valves of the flare line with borehole pressure. Close the extreme string valve of the flare line.

The number of revolutions of the rod 25 during depressurization of the packing place should coincide with the number of revolutions during sealing.

The pressure on the pressure gauge 32 of the device should increase to the borehole when the extreme string valve of the flare line is closed and not fall when the valve of the needle valve 31 is opened. This will indicate that the depressurization has occurred completely. Close the needle valve tap 31.

Keep the packer 14 in the depressurized position for 10 ... 15 minutes, so that the rubber seal 18 restores its original size after deformation during sealing.

By turning the steering wheel 7, bring the packer 14 out of the gate valve gate, paying attention to the constancy of the force exerted on the handles of the steering wheel 7, and not allowing the packer 14 to move with increasing force.

Close the main valve and, relieving pressure through the needle valve valve 31, make sure that there is no overflow of the borehole fluid through the gate valve of the main valve.

Unfasten the flange connection 3 of the housing 1 of the device with a buffer valve, dismantle the device from the Christmas tree and install a flange with a quick coupling on the flange of the buffer valve and fasten it.

Open the main valve. Make sure the flange connection of the buffer valve with the flange of the quick coupler is tight and open the string valve on the side of the loop.

Dismantle the work platform with a ladder.

In the event that gaps in the pressure of the test are detected when crimping the fountain tree with hydrostatic pressure, it is necessary to relieve the pressure in the over-packer cavity to zero by the needle valve valve 31 and close the valve. Further work at the wellhead should be carried out according to a plan specially developed and approved in the established manner.

The device for crimping the fountain "Christmas tree" was tested and implemented at the Orenburg gas condensate field.

Claims (3)

1. A device for crimping, comprising a housing and a packer, which is equipped with a pallet, a sleeve with a guide key, a pipe with a sealing unit, and a housing with a flange for mounting on buffer valve flange, and a nut having a square protrusion for its rotation by the steering wheel, a screw with a rod having a key groove is axially displaced inside the housing with the nut when the nut is rotated the guiding key of the sleeve, the packer has a screw with a rectangular protrusion and is attached to the screw with the rod, a rod with a rectangular selection is located inside the screw with the rod, covering the rectangular protrusion of the packer screw to transmit torque during rotation of the rod, the pipe with the sealing unit is located on the side of the housing flange and serves to guide and seal the screw with the rod, and through-hole drilling with threaded holes for filling the over-packer cavity of the fountain “Christmas tree” of the crimping fluid bone and transferring the pressure of pressure into it, and the pallet covers the body and is placed below the said openings of the body for receiving the pressure fluid and transferring it through the said openings of the body into the channels of the gate valves of the Christmas tree. 2. The device according to claim 1, characterized in that the housing nut, packer screw and rod are equipped with thrust bearings. 3. The device according to claim 1 or 2, characterized in that it is provided with an indicator of the position of the packer and a nut fixed to the end of the screw with the rod, while the indicator of the position of the packer is configured to be installed on the end of the nut.

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