Wellhead facility for extracting pipe string from borehole

FIELD: oil and gas production.

SUBSTANCE: disclosed facility consists of lifter connected to damper and of generator of vertical pulses coupled with pipe string below. The damper corresponds to a cylinder with a piston, internal cavity of which is filled with gas under the piston. The generator of vertical pulses is made in form of a tubular case consisting of successively coupled power cylinders and of the damper connected above with a piston rod. The power cylinders are equipped with pistons successively connected by means of hollow rods so, that under piston cavities of the power cylinders are communicated between them and with the generator of hydraulic pulses via a distributor. The lower rod of the power piston is plugged from below and is connected to the pipe string. The distributor consists of the cylinder case with two chambers and is divided with a partition furnished with a one-stage valve for supply of liquid from a pump and with a back valve for discharge of liquid from the power cylinders. A safety valve is positioned between the distributor and a generator of hydraulic pulses; it is communicated with a buffer reservoir. All valves can operate with variations within wide pressure range.

EFFECT: facilitating selection of optimal mode of operation resulting in higher efficiency of stuck pipe string extracting from borehole, also facility is simple in design, not expensive in fabrication and low metal consuming.

1 dwg

 

The invention relates to the oil and gas industry, in particular to the wellhead device for the emergency release of the column pipe stuck in a well.

Known mouth installation, generation and transmission of acoustic energy to free stuck pipe string in a borehole (US 4429743, EV 37/08; EV 41/00, publ. 07.02.1974 g), including an orbiting mass oscillator, which generates acoustic energy from the resonator connected to the mouth with the column pipe, a lift and a damper installed between the generator and the lift and made in the form of a vertical piston of the shock absorber, fluid-filled or gas-liquid mixture.

The disadvantages of this estuarine system are:

firstly, the complexity of the design, due to the large number of components and parts;

- secondly, the high cost of production and metal consumption (orbiting mass oscillator is designed to generate acoustic energy from the resonator).

The closest in technical essence is a wellhead device to release the tubing from the well (patent US 3500908, EV 37/08; EV 41/00, publ. 07.02.1974, including the damper installed between the lift and generator vertical pulses, which bottom is connected with the column pipe, and a damper is made in view of the upper and lower horizontal plates with vertical telescopically inserted into each other by the cylinder and piston rod, between stops which springs installed and the generator vertical pulses is made in the form prescribed in the case of pairs of connected vertical gear wheels with an offset center of gravity is selected so that during the rotation of the gear wheels of their total momentum was directed along the axis of the pipe string.

The disadvantages of this estuarine system are:

- first, no adjustment efforts vibration oscillations in the process of freeing stuck pipe string.

- secondly, high precision gears, directly affecting the cost of device fabrication, in the opposite case can be jammed gears in the process;

- thirdly, the force along the axis of the column created stuck on the string of pipe, equivalent force up and down, it also creates a shock metal parts of equipment together, which reduces the efficiency of extraction of stuck pipe string from the well.

The objective of the invention is the ability to create controlled effort without shock vibration oscillations stuck on column pipes, as well as reducing the cost of production.

The problem is solved wellhead device to release the tubing from the well, comprising a damper mounted between the lift and generator vertical the data pulses, that bottom is connected with the column pipe.

What's new is that the damper is made in the form of a vertical sealed cylinder with a piston, the inner cavity under the piston which is filled with gas, and a generator vertical pulses is made in the form of a tubular body consisting of series-connected power cylinder and connected to the top rod of the piston of the damper, with the power cylinders are equipped power pistons, connected in series hollow rod so that podpisniye cavity actuators communicated between and through the valve and pressure relief valve - hydraulic generator pulses, are equipped with a buffer tank, the bottom rod of the power piston, plugged at the bottom, is connected with the column pipe, and a valve consisting of a cylindrical body with two chambers separated by a partition, which has a direct valve for fluid supply from the pump and check valve to discharge fluid from the power cylinder spring-loaded valves, the force of the compression spring check valve is higher than the force of the compression springs direct valve, a relief valve disposed between the distributor and the generator hydraulic pulses, installed in the side channel flow tube and configured to messages of this pipe with b the atmospheric capacity when reaching inside the pipe, accordingly, in the hydraulic generator pulses and the tubular casing pressure exceeds the opening pressure of the safety valve, the orifices direct, inverse and safety valves fitted with fittings and springs forward, reverse and safety valves are tightened by adjusting screws that allow you to change in a wide range of pressure valves.

The drawing shows the proposed wellhead device to release the tubing from the well in longitudinal section.

Wellhead device to release the tubing from the well (not shown) includes a damper 1 (see drawing)installed between the lift 2 (conventionally shown crumbles) and generator vertical pulse 3.

The damper 1 is made in the form of a vertical sealed cylinder 4 is hermetically inserted in the piston 5, the inner cavity 6 which is filled with a gas (such as nitrogen, under pressure 30,0 MPa).

Generator vertical pulse 3 is made in the form of a tubular casing and consists of several interconnected power cylinder 7...7n(for example, of the five interconnected cylinders), inside which is placed interconnected pistons 8...8nwith the rods 9; 9'...9nwith all the rods except the lower rod 9nthat sapose the bottom and through the tee 10 is connected with the upper end of the stuck pipe string 11, made hollow and hydraulically report podpisniye cavity 12...12nthe power cylinder 7...7neach other via channels 13. Top generator vertical pulses is connected to the damper 1, and podpornega cavity 12 of one of the actuators, for example 7, made with the possibility of message generator hydraulic pulses 14 (e.g., in the form of a piston pump of the type CA-320 with removed two suction and one discharge valve).

Podpisniye cavity 12...12nthe power cylinder 7...7ncommunicated between and through the distributor 15 and the relief valve 16 with hydraulic generator pulses 14, equipped with a buffer tank 17, and the lower rod 9nplugged at the bottom and is connected with the column pipe 11.

The valve 15 consists of a cylindrical body 18 with two chambers 19 and 20 separated by a partition 21, which has a direct valve 22 for supplying fluid from the hydraulic generator pulses 14 and the check valve 23 for discharge of fluid from the power cylinder 7...7n, spring-loaded by means of springs 24 and 25, respectively, with the force of the preload spring 25 check valve 23 is higher than the preload force of the spring 24 direct valve 22.

Straight valve 22 closes the opening 26 and the check valve 23 closes the opening 27, issue Lennie in the partition 21 of the distributor 15.

A relief valve 16 is spring-loaded by a spring 16'is disposed between the valve 15 and the hydraulic generator pulses 14 and is installed in the side channel 28, blocking the hole 29 of the entry pipe 30, and is made with a message passing pipe 30 through line 31 to the buffer capacity of 17, when reaching the inside of the pipe 30, respectively, in the hydraulic generator pulses 14 and the tubular enclosure in the form of the generator of the vertical pulse 3, the pressure above the opening pressure of the safety valve 16.

In the hole 26 direct valve 22 and the hole 27 of the check valve 23, and the hole 29 of the entry pipe 30 respectively installed fittings 32, 33 and 34. In addition, the spring 24 direct valve 22 and 25 of the check valve 23, and the spring 16' safety valve fitted respectively adjusting screws 35, 36 and 37.

Unauthorized overflows of liquid are excluded sealing elements 38, 39, 40,41.

A practical way found that when carrying the fitting hole 20 mm pressure valves with screwed-on round three, and completely screwed the adjusting screw varies within 100 ATM=10 MPa.

Wellhead device to release the tubing from the well is as follows.

The device sobirajutsa the wellhead, as shown in the drawing, however, depending on the effort required to release the stuck pipe string, make adjustment direct 22, 23 and reverse safety 16 valves, that is, by inversion (top) of the respective adjusting screws 35, 36 and 37 establish settlement pressure on each of the valves 22, 23 and 16.

For example, the hydraulic pressure direct valve Pp=1 ATM=0.1 MPa; and a hydraulic pressure valve Pp=60 ATM=6 MPa, and a hydraulic opening pressure of the safety valve Pmax=150 ATM=15.0 MPa. With the help of lift 2 (see drawing) produce a tension device and, accordingly, stuck in the well column pipe 11.

Actuate the hydraulic generator pulses 14.

In the process of working pistons (not shown) of the hydraulic generator pulses 14 are moving, for example, from left to right, pumping the working fluid (e.g. water) in the distributor 15. The working fluid first enters into the chamber 20 of the distributor 15, where through the fitting 33 is installed in the hole 26 direct valve 22, by releasing its spring 24 (hydraulic pressure Pp=1 ATM=0.1 MPa in the chamber 20 of the distributor 15), enters the chamber 19 of the valve 15, through which g is draulically line 42 is pumped by the hydraulic generator pulses 14 in podporchennuyu cavity 12 of the hydraulic cylinder 7.

From podpornoy cavity 12 of the hydraulic cylinder 7, the working fluid through the channels 13 flows into podpisniye cavity 12'12...nother hydraulic cylinders 7'...7n.

In the pistons 8...8nwith the rods 9; 9'...9nunder the action of hydraulic pressure generated by the hydraulic generator pulses 14 in podporchenyj cavities 12...12nhydraulic cylinders 7...7nmove up, pulling a stuck column pipe 11 relative to the moving down of the power cylinder 7...7ngenerator vertical pulse 3, while in the inner cavity 6 of the damper 1 is the gas compression piston 5, which is tightly inserted into the cylinder 4, and is the damping of the shock efforts aimed down, perceived a lift 2.

The movement of the pistons 8...8nwith the rods 9; 9'...9nup (pulse) and, respectively, pulling the stuck pipe string 11 is as long as no work relief valve 16. This occurs when Pmax=150 ATM=15 MPa, which is controlled by a pressure gauge 43 and corresponds to the completion of discharge of the working fluid in the power cylinder 7...7n.

After activation (opening) of the safety valve 16 (Pmax=150 ATM=15 MPa) working fluid, by releasing the spring 16', flows through the nozzle 34 holes 29 in the bore of the nozzle 30 in Boko the second channel 28 and thence by line 31, the working fluid enters the buffer tank 17, the pressure in the relief valve 16 and line 31 connected with the buffer tank 17 will be more Rmax=150 ATM=15 MPa. This continues up until the pistons in the hydraulic generator pulse 14 will not move left to right to its extreme right position, the pressure in the discharge line 35 and, respectively, inside the power cylinder 7...7nwill not exceed the Pmax=150 ATM=15 MPa, which is controlled by the readings of the pressure gauge 43.

Further, the direction of movement of the pistons of the hydraulic generator pulses 14 is changed to the opposite (right to left). The volume of the piston cavity (not shown) starts to increase, and the safety valve 16 is closed, i.e. occupies the initial position (see drawing).

The pressure in podporchenyj cavities 12...12nhydraulic cylinders 7...7nfalls due to the weight of the stuck pipe string 11, the pistons 8...8nwith the rods 9; 9'...9nmove down relative to the moving up of the hydraulic cylinders 7...7ngenerator vertical pulse 3, while the working fluid under the weight of the stuck pipe string 11 begins to flow from podporchenyj cavities 12'12...nhydraulic cylinders 7'...7nby hydraulic lines 42 in the valve 15.

In the generator vertical pulse 3, the piston 5 under the action of pressure gas is in the inner cavity 6 of the damper 1 is returned to its original position (see the drawing) and is the damping of the effort is directed upwards perceived by the lift 2.

Reaching the distributor 15, the working fluid first enters the chamber 19 of the distributor 15, where through the fitting 32 is installed in the hole 27 of the check valve 23, by releasing its spring 25, enters the chamber 20 of the distributor 15, whence it flows into the piston cavity generator hydraulic pulses 14, since the pistons last move from left to right, resulting in increased volume of the piston cavity generator hydraulic pulses 14.

The flow of the working fluid from podporchenyj cavities 12'12...nhydraulic cylinders 7'...7nby hydraulic lines 42 in the distributor 15 and the distributor 15 in the piston cavity generator hydraulic pulse 14 is terminated by closing valve 23 at the moment of achievement in the chamber 19 of the distributor 15, the hydraulic pressure Pp=60 ATM=6 MPa.

Thus, in the hydraulic system of the pump-dispenser-power hydraulic cylinders hydraulic pressure is not reduced below 6 MPa, which allows you to stay stuck to the string of pipe 11 in a tense position, that is, not to relieve the weight of the column to zero, so the momentum of the effort is always directed upwards, and a relief valve 16 prevents a sharp increase in pressure above the maximum DOP is valid P max=150 ATM=15 MPa, which ensures trouble-free operation of the device.

The damper 1 is used for damping alternating loads transmitted during operation of the proposed device to lift 2. Thus, there is one cycle of operation of the wellhead device to release the tubing from the well.

In the future, the cycle repeats until the release of stuck pipe string, as described above, with bumpless vibration impacts stuck on the string of pipe 11.

If necessary, at any moment in the process of liberation in the presence of circulation can be stuck washing the column pipe 11 through the tee 10.

In the case of an unsuccessful release of stuck pipe string, produce reconfiguration direct 22, 23 and reverse safety 16 valve directly on the mouth by inversion (top) of the respective adjusting screws 35, 36 and 37, thereby reconfigure the estimated pressure of each of the valves 22, 23 and 16.

For example, the hydraulic pressure direct valve Pp=3 ATM=0.3 MPa and a hydraulic pressure valve Pp=80 ATM=8 MPa, and a hydraulic opening pressure of the safety valve Pmax=220 ATM=22,0 MPa. Thus, increasing the force of vibration oscillations accompanying the release of the string of pipe 11.

In the future all of the above-described cycle of operation of the device is repeated until the release of stuck pipe string 11.

The proposed wellhead device to release the tubing from the well allows you to adjust forward, backward, safety valves in a wide range of pressures directly in the process of freeing stuck pipe string from the well, which allows you to choose the optimal mode of operation that is desired tension unstressed vibration impacts stuck on the string of pipe, which increases the efficiency of extraction from the borehole stuck pipe string. In addition, the proposed device has a simple structure and relatively with prototype cheap to manufacture and has a lower metal content.

Wellhead device to release the tubing from the well, comprising a damper mounted between the lift and generator vertical pulses, which bottom is connected with the column pipe, characterized in that the damper is made in the form of a vertical sealed cylinder with a piston, the inner cavity under the piston which is filled with gas, and a generator vertical pulses is made in the form of a tubular body consisting of series-connected power cylinder and connected to the top rod of the piston of the damper, with the power cylinders are equipped power pistons, connected in series hollow rod so that podpisniye cavity actuators communicated between and through the valve and a relief valve with hydraulic generator pulses, are equipped with a buffer tank, the bottom rod of the power piston, plugged at the bottom, is connected with the column pipe, and the valve consists of a cylindrical body with two chambers separated by a partition, which has a direct valve for fluid supply from the pump and check valve to discharge fluid from the power cylinder spring-loaded valves, the force of the compression spring check valve is higher than the force of the compression springs direct valve, a relief valve disposed between the distributor and the generator hydraulic pulses, installed in the side channel flow tube and configured to messages of this pipe with a buffer capacity when reaching inside the pipe, respectively, in the hydraulic generator pulses and the tubular casing, the pressure above the opening pressure of the safety valve, the orifices direct, inverse and safety valves fitted with fittings and springs forward, reverse and safety valves are tightened by adjusting screws that allow you to change in a wide range of pressure crobat is of the valves.



 

Same patents:

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FIELD: drilling equipment, possible use for freeing drilling column if it is stuck in the well.

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1 dwg

FIELD: drilling equipment, namely engineering of devices for freeing wedged part of drilling column in wells.

SUBSTANCE: device includes tubular body and hollow mandrel which are telescopically interconnected. The body is composed of parts, and contains first packer and grooves on internal surface on the side of first edge. In the middle section the body contains internal anvil-shelves, and on the side of second edge - an internal thread. The mandrel is composed of parts, contains threaded tail and grooves on external surface on the side of first edge of body, strikers between internal anvil-shelves of body, at least one piston with second packer on the side of second edge of body. Strikers and piston form a chamber filled with working liquid. The device contains at least one limiting mechanism for connecting working liquid to chamber for liquid in form of belt of greater diameter of mandrel and circular valve, installed in working liquid chamber with mandrel passing through internal hollow. The internal surface of circular valve is in contact with belt of greater diameter of mandrel. Longitudinal drive of circular valve is limited between two stops, projecting from internal surface of the body. Longitudinal drive equals at least the longitudinal drive of mandrel relatively to spring-loaded mechanism of latch from the start of application of force which makes the mandrel enter the body before setting of latch mechanism to working position. Between first and second packers at least two packers are positioned, which divide the chamber for liquid on three sections. Spring-loaded mechanism of latch is contained inside the working liquid chamber, blocking longitudinal drive of mandrel relatively to the body. The stop which limits longitudinal drive of circular valve towards the second edge of body with internal thread, is formed by shelf from lesser diameter of internal surface of body, to which one of packers, which divide working liquid chamber onto sections, is movably connected. Piston with packer on the side of second edge of body with internal thread is made with possible sliding relatively to mandrel and provided with its own packer in contact with mandrel.

EFFECT: increased reliability and resource, prevented unwanted activation, destruction or wedging of drill bit.

4 cl, 4 dwg

FIELD: drilling equipment, particularly devices to create impact loads for stuck drilling string section freeing from oil or gas well.

SUBSTANCE: device comprises tubular body and mount slidably connected with each other so that the components are restricted from rotation. Tubular body has slots formed in outer surface thereof, inner anvil extensions, the first sealing member arranged from the first end side. Mount has slots in inner surface, belt having increased diameter, percussion means arranged between anvil extensions, the second sealing member arranged in percussion means from the side of the second body end and defining working liquid chamber. Mount also has circular valve having annular side surface, two ends, outer surface and inner surface defined by inner cavity, as well as restriction mechanism, which restricts working liquid communication with one section of working liquid chamber. The restriction mechanism is installed in working liquid chamber and has mount extending through inner cavity and located inside body. The restriction mechanism includes at least one bypass valve arranged in circular valve, which restricts working liquid flow inside one chamber section in one direction. Inner circular valve surface is in tight contact with mount belt having increased diameter. Circular valve travel is limited by two stops projecting from inner body surface and is equal to at least difference between inner and outer surface radii. Stop, which limits longitudinal circular valve travel towards percussion means with the second sealing member installed therein is defined by projection extending from inner body surface having decreased diameter adapted to be slidably connected to the second sealing member of percussion means. At least one percussion means arranged in working liquid chamber has self-sealing member. Diameter of each inner body surface is equal to that of mount, which defines movable connection with the first sealing member arranged in the body.

EFFECT: increased reliability and service life, prevention of uncontrolled device actuation.

3 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas producing industry, particularly to wellhead facilities for release of flow string stuck in borehole at failure. The wellhead facility for release of flow string out of borehole consists of a damper and of a vertical pulse generator. The damper is made in form of a vertical sealed cylinder with a piston, an under piston cavity of which is filled with gas, while the generator is made as tubular case consisting of successively connected power cylinders. The power cylinders are furnished with pistons serially joined with hollow rods so, that under piston cavities of the power cylinders communicate between them and via a distributor they communicate with a piston valveless pump. The distributor consists of a cylinder case with two chambers divided with a partition equipped with direct-acting and back spring loaded valves: also force of contraction of the back valve with the spring is higher, than contraction force of spring of the direct-acting valve.

EFFECT: simple design and raised efficiency of release of stuck flow string out of borehole.

1 dwg

FIELD: oil and gas production.

SUBSTANCE: disclosed facility consists of lifter connected to damper and of generator of vertical pulses coupled with pipe string below. The damper corresponds to a cylinder with a piston, internal cavity of which is filled with gas under the piston. The generator of vertical pulses is made in form of a tubular case consisting of successively coupled power cylinders and of the damper connected above with a piston rod. The power cylinders are equipped with pistons successively connected by means of hollow rods so, that under piston cavities of the power cylinders are communicated between them and with the generator of hydraulic pulses via a distributor. The lower rod of the power piston is plugged from below and is connected to the pipe string. The distributor consists of the cylinder case with two chambers and is divided with a partition furnished with a one-stage valve for supply of liquid from a pump and with a back valve for discharge of liquid from the power cylinders. A safety valve is positioned between the distributor and a generator of hydraulic pulses; it is communicated with a buffer reservoir. All valves can operate with variations within wide pressure range.

EFFECT: facilitating selection of optimal mode of operation resulting in higher efficiency of stuck pipe string extracting from borehole, also facility is simple in design, not expensive in fabrication and low metal consuming.

1 dwg

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