Hydraulic catcher

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

SUBSTANCE: hydraulic catcher includes tubular body and hollow spindle, connected together without possible rotation. Upper and lower stopping collars are formed on spindle, between which a ring-shaped piston is mounted. Internal surface of body is made in form of cylindrical surface with a band of extended diameter for interaction with piston. Between body and spindle, seals of moving and immoveable connections are mounted, and also forcing and damping chambers are formed, filled with working liquid. Buffer hollow is formed in the body on the side of damping chamber. Piston ring is mounted in damping chamber with possible sliding, isolating damping chamber from buffer hollow. Between body and spindle, throttling channel is formed and a caging device is contained, and also a metering device, letting through a limited volume of working liquid during movement in throttling channel. Caging device is made in form of overflow bushing, positioned inside the piston, and packing bushing, positioned on the side of damping hollow. Metering device is made in form of at least one throttling groove on the end of piston between ends of piston and packing bushing in contact with each other. Packing bushing forms a circular running channel together with the body. Overflow bushing contains external circular collar in forcing chamber. Piston contains internal circular collar on the side of damping chamber. Overflow bushing in middle part is made with longitudinal slits. Drive of piston from the end of packing bushing, contacting the overflow bushing to external circular collar of overflow bushing exceeds distance from the end of overflow bushing, directed towards the damping chamber, up to close edge of each longitudinal slit.

EFFECT: increased efficiency when freeing pipes, increased reliability and resource.

4 cl, 6 dwg

 

The invention relates to the drilling technique, namely, devices for creating shock loads upward, to release the stuck portion of the drill string in vertical, directional and horizontal oil and gas wells.

Known hydraulic drilling jar containing the mandrel, the housing telescopically located around the mandrel, and the first and second pistons located between the mandrel and the housing, which are spaced longitudinally and form an airtight chamber filled with working fluid, with the first piston has first and second flow channels, the main valve attached to the second flow channel is moved between the first and second working positions, in the first position, the flow of the working fluid flows through the second flow channel, and in its second position, the flow through the second flow channel is limited (US 5318139, E 21 In 4/14; E 21 In 31/113, Jun.7, 1994).

In the known construction is provided an unloading valve for pressure relief, which moves between the first and second working positions in response to a pressure increase above a predefined level, the unloading valve connected with the main valve, and moving the discharge valve between the first and second working position is the reject is their main valve between its provisions.

A disadvantage of known construction is incomplete use of opportunities to improve the reliability and life, but also control the dynamics of the discharge pressure of the working fluid from the pressure chamber in the damper chamber, when creating a shock loads upward, necessary for the emergence of a certain level of relaxation of tensile stress waves traveling through the length of the tubing in the well, obtain the optimum ratio between the shock and the shock pulse applied to the place of sticking columns.

A disadvantage of the known construction is also a violation and the deterioration of the characteristics of the spring devices of the pistons and valves containing intermediate connecting links with long-term exposure pulses strike the working fluid, a high level of pressure loss, resulting in failure in the well, reducing their reliability and resource that is due to material fatigue of the springs and the deposition of metallic particles (sludge) due to wear and chipping of the rubbing surfaces, for example, layers of a coating of chromium in friction pairs, which causes abrasion of the rubbing surfaces in friction pairs.

As a consequence, does not necessarily increase the precision of the time delay generated by the hydraulic system, to strike up with the best soothes the Institute between the shock and the shock pulse, and this does not allow the operator on the rig to change allowable power tension on the drill string, then apply the brake drawworks, and the force during the liberation of sticking hard to control that causes damage to the lifting equipment.

Known hydraulic percussive tool for drilling complex, consisting of a tubular casing and core, telescopically inserted into the housing, the housing and the core can move between them in the longitudinal direction and to occupy open and closed positions, the first pair of interacting colliding ends, one of which belongs to the body, and the second core, passes the drilling complex impulse strike aimed up, essentially, in the collision of these ends in the open mutual position of the body and core, and a second pair of interacting colliding ends, one of which belongs to the body, and the second core, transmits the drilling complex momentum of the kick, downward, essentially, in the collision of these ends in a closed mutual position of the body and core, while inside the shell and core are cylindrical cavity forming a chamber filled with working fluid, the top and bottom edges of this camera is equipped with a tight seal, the chamber is a valve mechanism, which divides it into upper and lower parts, and the lower section has a movable element that can freely move in the longitudinal direction, one edge of this element is in contact with the working fluid located in the chamber, and the second takes the pressure of the medium filling the borehole, and transmits the pressure of the working fluid.

In addition, the known hydraulic percussive tool contains a device with which you can change the pressure of the working fluid in the upper part of the chamber, which increases the specified pressure in the case when the core and the casing occupy an open position and a closed position of the core and housing - reduces (US 4230197, E 21 In 1/10, Oct.28, 1980).

A disadvantage of known construction is incomplete use of opportunities to improve the reliability and life, but also control the dynamics of the discharge pressure of the working fluid from the pressure chamber in the damper chamber when creating shock loads upward, necessary for the emergence of a certain level of relaxation of tensile stress waves traveling through the length of the tubing in the well, obtain the optimum ratio between the shock and the shock pulse applied to the place of sticking columns.

Another disadvantage of the known construction is one the camping violations and the deterioration of the characteristics of the metering devices: valves 84, 86 at their radial location relative to the longitudinal throttle channel 82, which is explained by the lack of flushing and self-cleaning" of the throttle channels 82, clogging and deposition of metallic particles (sludge) due to wear and chipping of the rubbing surfaces, such as a layer of chromium coatings in pairs of friction that causes the failures, as well as "burrs" of the rubbing surfaces in friction pairs.

As a consequence, does not necessarily increase the precision of the time delay generated by the hydraulic system, to strike up, with the optimal ratio between the shock and the shock pulse, and this prevents the operator on the rig to change allowable power tension on the drill string, then apply the brake drawworks, and the force during the liberation of sticking hard to control that causes damage to the lifting equipment.

Famous Yas used in the drill string containing the spindle, attached one end to the first drill pipe and covering a substantial portion of the spindle housing attached at the other end to the second drill pipe near the opposite edge of the jar, with the spindle and housing have first and second pairs of hard surfaces that define the extended and retracted position of the spindle, respectively, and between the spindle is m and the casing is formed an annular chamber for working fluid, moreover, the camera has a first portion with a first cross-sectional area, the second part with relatively greater cross-sectional area, and the transition zone between the first and second parts inside the chamber moves the piston from the first position in the first part of the chamber in which the flow of fluid from one side to the other is limited, in the second position the second portion of the chamber, wherein said flow unrestricted, while the piston is made the bypass hole, passing the working fluid through the piston, the drive mechanism moves relative to the piston stroke of the drive mechanism is defined near one end of the retracted position of the spindle intermediate the distance from the edge position of rest of the piston, the opposite edge - extended position of the spindle and inside the spring, providing the movement of the piston from the first position to the second and back (US 4478284, E 21 In 31/113, Oct.23, 1984).

The stroke of the drive mechanism is defined near one end of the retracted position of the spindle, at an intermediate distance from the edge position of rest of the piston, the opposite edge - extended position of the spindle, which makes more efficient use of the ratio between the volume of the pressure and damper chambers, taking into account the progress of the spindle, with increasing giving the value of the working fluid.

A disadvantage of known construction is incomplete use of opportunities to improve the reliability and life, but also control the dynamics of the discharge pressure of the working fluid from the pressure chamber in the damper chamber when creating shock loads upward, necessary for the emergence of a certain level of relaxation of tensile stress waves traveling through the length of the tubing in the well, obtain the optimum ratio between the shock and the shock pulse applied to the place of sticking columns.

Another disadvantage of the known construction is the disturbance and deterioration of characteristics of the spring devices of the pistons and valves containing intermediate connecting links with long-term exposure pulses strike the working fluid, a high level of pressure loss, resulting in failure in the well, reducing their reliability and resource that is due to material fatigue of the springs and the deposition of metallic particles (sludge) due to wear and chipping of the rubbing surfaces, such as a layer of chromium coatings in pairs of friction, which causes the "fins" of the rubbing surfaces in friction pairs.

Closest to the claimed invention is a hydraulic jar, consisting of telescopically connected tubes, such as the outer casing is a and the inner spindle, between the pipes formed by the annular cavity is sealed by seals in areas of constant diameter, the outer tube is an overflow hole for communication with the bore in the annular cavity tightly sliding piston ring, isolating the bypass hole formed within a hollow chamber filled with working fluid, where one of the pipes creates in the annular cavity throttling area within which the other pipe has a longitudinal groove, limited upper and lower thrust shoulder, and retiree device of the rings, reciprocating movement on this site and at the endpoints of its travel, periodically blocking a flow of the working fluid, in this case the locking is equipped with a metering device, which transmits a limited amount of working fluid with the movement of the rings in a throttling section, and by means of connecting links in the ring, outside this area, again in him before the other ring is included in this section (US 5174393, E 21 In 31/113, Dec.29, 1992).

When moving arethrough device up or down Yas provides respectively aimed blows on stuck in a wellbore place sticking.

The stroke of the drive mechanism is defined near one end of the retracted by what Ozanam spindle, at intermediate distance from the edge position of rest of the piston, the opposite edge - extended position of the spindle (slotted end), which does not allow more efficient to set the ratio between the volume of the pressure and damper chambers with regard to the progress of the spindle with the piston, increasing the pressure of the working fluid in the pressure chamber until the pressure relief to get a specific dynamic impact with sufficient shock pulse, essentially, ultra-high impact capacity of the well.

A disadvantage of known construction is incomplete use of opportunities to improve the reliability and life, but also control the dynamics of the discharge pressure of the working fluid from the pressure chamber in the damper chamber when creating shock loads upward, necessary for the emergence of a certain level of relaxation of tensile stress waves traveling through the length of the tubing in the well, obtain the optimum ratio between the shock and the shock pulse applied to the place of sticking columns.

Another disadvantage of the known construction is the disturbance and deterioration of characteristics of the spring devices of the pistons and valves containing intermediate connecting links with long-term exposure pulses strike the working fluid, a greater level of pressure loss, leading to failure in the well, reducing their reliability and resource that is due to material fatigue of the springs and the deposition of metallic particles (sludge) due to wear and chipping of the rubbing surfaces, such as a layer of chromium coatings in pairs of friction, which causes the "fins" of the rubbing surfaces in friction pairs.

As a consequence, does not necessarily increase the precision of the time delay generated by the hydraulic system, to strike up, with the optimal ratio between the shock and the shock pulse, and this prevents the operator on the rig to change allowable power tension on the drill string, then apply the brake drawworks, and the force during the liberation of sticking hard to control that causes damage to the lifting equipment.

Another disadvantage of the known construction is its dead-end buffer cavity, soamsawali through-hole (39) to the well.

When performing descents and ascents in the process of drilling the cavity sucks and collects small particles drilling cuttings (cuttings), during some time in the buffer cavity sludge cemented and results known hydraulic Yas to failure.

The technical challenge which seeks inventive image is eenie, is to increase the reliability and life, the formation of ultra high impact power in the wellbore at the optimum ratio between the shock and the shock impulse acting up in place of sticking of the column, increasing the precision of the time delay created by the hydraulics to attack, run by means of regulation of the dynamics of the discharge pressure of the working fluid from the pressure chamber in the damper chamber using the effect of "sudden expansion", as well as combining the functions of the "disconnect" and the metering mechanisms in the bypass sleeve installed inside the annular piston, and a sealing sleeve in contact with the end face of the piston.

The essence of the technical solutions is that in the hydraulic ACE, consisting of a tubular body and a hollow spindle connected without rotation between them, for example, splined connection, the spindle is formed by upper and lower thrust collars, between which is mounted an annular piston, the inner cavity of the case is made in the form of a cylindrical surface with a band of enlarged diameter for engagement with the annular piston, between the housing and the spindle is installed seal movable and immovable joints and formed pressure and damping chamber filled with working fluid, to use, side damper chamber is formed by the buffer cavity and the damper chamber is installed with a slidable piston ring, isolating damper chamber from the buffer cavity between the housing and the spindle is formed throttle channel and contains retiree device, and includes a dosing device, which transmits a limited amount of working fluid with the movement in the throttle channel, according to the invention, retiree device made in the form of a bypass sleeve placed inside the annular piston, and a sealing sleeve located from the side of the damper cavity, which is concentric with and is tightly fitted with the possibility of axial stroke between the thrust shoulders of the spindle and slide spindle and(or) and(or) case, while the metering device made in the form of at least one of the throttle groove on the end of the annular piston between the contacting with each other by the ends of the piston and the sealing sleeve and the sealing sleeve forming with the casing an annular flow channel, with the bypass sleeve includes an outer annular shoulder in the pressure chamber, an annular piston has an internal annular shoulder side of the damper chamber and the bypass sleeve in the middle part is made with longitudinal slots, and a stroke from that is CA ferrules, contact with the bypass sleeve, to the outer ring clamp bypass sleeve exceeds the distance from the end of the bypass sleeve directed toward the damper chamber to the middle region of each longitudinal slit.

The tubular body is made of upper and lower housings, connected to a threaded adapter and screw the adapter contains at least one dominou cavity, which is connected with the pressure chamber through the annular orifice channel between the threaded adapter and the hollow spindle.

The annular piston is made flexible in the radial direction of the annular end face formed with a cavity with an inner cone, the larger diameter of which is directed to the pressure chamber, and with hard damping part, directed to the damper chamber, while the outer surface of the annular piston is made in the form of a cone, the base of which is situated on either side of the damper chamber.

Throttle groove on the end of the annular piston is oriented in the tangential direction relative to the diameter of the bypass sleeve.

Perform hydraulic jar so that retiree device made in the form of a bypass sleeve placed inside the annular piston, and a sealing sleeve located from the side of the damper cavity, which are concentric and tight mouth is attached with the possibility of axial stroke between the thrust shoulders of the spindle and sliding spindle, and(or) and(or) case, while the metering device made in the form of at least one of the throttle groove on the end of the annular piston between the contacting with each other by the ends of the piston and the sealing sleeve and the sealing sleeve forming with the casing an annular flow channel, with the bypass sleeve includes an outer annular shoulder in the pressure chamber, an annular piston has an internal annular shoulder side of the damper chamber and the bypass sleeve in the middle part is made with longitudinal slots, and the piston stroke from the end of the sealing sleeve in contact with the bypass sleeve to the outer ring clamp bypass sleeve exceeds the distance from the end of the bypass sleeve directed toward the damper chamber to the middle region of each longitudinal slit, increases reliability and service life, as well as forms ultra high impact power for any shock loads upward (due to stress relaxation in the tension of the drill string)to free from sticking of the drill string and(or) the drilling tool in the well, due to the decreased pressure loss and decrease in time "sudden expansion" of the working fluid in the damper parts of the sealed chamber for receiving the dynamic impact with a certain shock pulse is lsom, and also by increasing the precision of the time delay created by the hydraulics to strike at the optimum ratio between the shock and the shock pulse.

This combines the functions of the "disconnect" and the metering mechanisms in the bypass sleeve installed inside the annular piston, and a sealing sleeve in contact with the end face of the piston, increasing their reliability and service life due to prevent deposition of metal particles (sludge) from wear and chipping of the rubbing surfaces, such as a layer of chromium coatings in pairs of friction, which prevents the "fins" of the rubbing surfaces in friction pairs, and also provides a more efficient use of the energy of the working fluid located in the pressure chamber at very high pressure (up to 250 MPa), when the discharge pressure in the damper chamber for occurrence in stretched the string of pipe of a specific stress relaxation and formation of ultra high impact power in the wellbore at the optimum ratio between the shock and the shock impulse acting on the place of sticking columns.

This allows us to increase the impact power is transmitted in place of sticking, for example, the drill in a horizontal well.

Improving the accuracy of time delay created by the hydraulics for the Eseniya blows up, at the optimum ratio between the shock and the shock pulse allows the operator on the rig to change allowable power tension on the drill string, then apply the brake drawworks. As a consequence, the force upon release of the clamping strap is easily controlled, prevented damage to hoisting equipment.

Perform hydraulic jar so that the tubular body is made of upper and lower housings, connected to a threaded adapter and screw the adapter contains at least one dominou cavity, which is connected with the pressure chamber through the annular orifice channel between the threaded adapter and a hollow spindle, provides lubrication polished telescopic connection between the housing and the spindle bending mandrel bent column pipes, reduces the likelihood exorbitant increase of stresses in the drill string due to the damping of the reflected wave coming to the hydraulic jar from the borehole bottom (bit)provides centering of the spindle in the housing due to the same ring gap and leakage of hydraulic wedge" of dominos cavity, covering the outer surface of the spindle, to the throttle channel, and then in the pressure chamber between the threaded adapter and the spindle when the discharge pressure of rabotaidoma, what prevents the destruction of, for example, chrome plating on contact between the surfaces of the spindle and housing.

Perform hydraulic jar so that the annular piston is made flexible in the radial direction of the annular end face formed with a cavity with an inner cone, the larger diameter of which is directed to the pressure chamber, and with hard damping part, directed to the damper chamber, while the outer surface of the annular piston is made in the form of a cone, the base of which is situated on either side of the damper chamber, provides the effect of "self-packing", which increases with the pressure of the working fluid in the pressure chamber, and high reliability hermetically sealed to the working fluid (transmission oil) seals type "metal - metal".

This arrangement provides a very high pressure up to 250 MPa, a high degree of tightness is permissible level of leakage in the control helium less 1,32·10-6cm3/s as well as durability under repeated impact of the dynamic loads that ensures high strength and plastic characteristics of the material of the ring piston, defined on the basis of calculations and experimental results: tensile strength σin≥950 MPa, the yield strength &x003C3; of 0.2≥850 MPa, elongation δ≥10% (instead of 2% after standard heat treatment), relative narrowing of the cross-sectional area ψ≥15%.

Perform hydraulic jar so that the throttle groove on the end of the annular piston is oriented in the tangential direction relative to the diameter of the bypass sleeve that improves the stability of throttle movements of the working fluid by increasing the length of the throttle groove to slow the movement of the working fluid to the working stroke of the hydraulic jar was delayed for the time required to produce the required tension of the deployed column to kick the desired strength.

Below are the best embodiment of a hydraulic jar with an outer diameter 172 mm for freeing stuck drill string in the downward directional borehole length of 3000 m, with a horizontal area of about 500 m.

1 shows a hydraulic jar section of the conventionally connected to the upper, middle and lower parts.

Figure 2 shows the middle part of the hydraulic jar at the beginning of the increasing pressure of the working fluid.

Figure 3 shows the middle part of the hydraulic jar when the discharge pressure of the working fluid from the pressure chamber in the damper chamber.

Figure 4 shows the element I in figure 2 to youseo device.

Figure 5 shows a section a-a figure 4 before the end of the annular piston.

Figure 6 shows the element II figure 3.

Hydraulic jar consists of a tubular body 1 and the hollow spindle 2, telescopically United, without rotation between them, for example, splined connection 3, the spindle 2 is formed by upper and lower thrust collars, respectively, 4, 5, between which is mounted an annular piston 6, and a threaded hole 7 of the spindle 2 is intended for connection with the bottom of the top of the drill pipe, and a threaded shank 8 of the outer casing 1 is intended for connection with the top of the bottom of the drill pipe shown in figure 1, 4.

The internal cavity of the housing 1 is made in the form of a cylindrical surface 9 with the shoulder of the enlarged diameter of 10 to communicate with the annular piston 6 between the housing 1 and the spindle 2 is installed seal 11 movable joints and seals 12 fixed connections and formed a pressure chamber 13 and the damper chamber 14 filled with the working fluid, shown in figure 1, 4.

The tubular body 1 made of slotted module 15 and the parts 16, 17, 18 and the hollow spindle 2 is made of parts 19, 20, 21, shown in figure 1.

In parts 17, 18 of the housing 1 from the side of the damper chamber 14 formed by the buffer cavity 22 and the damper chamber 14 is tightly fitted with the possibility of sliding orsave ring 23, isolating damper chamber 14 from the buffer cavity 22, while between the part 17 of the housing 1, part 20 of the spindle 2, in the internal cavity of the annular piston 6 in the pressure chamber 13 formed in the throttle channel and contains retiree device 24, and contains the metering device 25, which transmits a limited amount of working fluid in the throttle channel, shown in figure 1, 4.

The passage 26 of the spindle 2 with the annular piston 6 relative to the housing 1 from the beginning to increase the pressure of the working fluid in the pressure chamber 13 on volume ΔVpto relieve the pressure in the damper chamber 14 is defined by the volume of the working fluid in the pressure 13 and the damper chambers 14 from the relation:

Vp+ΔVp=(0,9...1,1)VdF, where Vp- the volume of the pressure chamber 13 in the beginning to increase the pressure of the working fluid, which is determined by the length 27 to the middle of the seal 11 of the rolling connection between the part 20 of the spindle 2 and part 17 of the housing 1; ΔVp- volume, characterized by the passage 26 of the spindle 2 with the annular piston 6 relative to the housing 1 from the beginning to increase the pressure of the working fluid in the pressure chamber 13 to the discharge pressure in the damper chamber 14; f=1.618..., constant coefficient, shown in figure 2

In the time of the discharge pressure of the working fluid at very high pressure, up to 250 MPa, the length of the pressure kamery marked POS, the length of the damper chamber 14 marked POS, a Vd- the volume of the damper chamber 14, shown in figure 3

Retiree device 24 is made in the form of bypass sleeve 30, is placed inside the annular piston 6, and the sealing sleeve 31, which is located from the side of the damper cavity 14, which are concentrically mounted for sliding piece 20 of the spindle 2, between the thrust collars 4, 5, and the annular piston 6 is slidable relative to the outer diameter 32 of the by-pass sleeve 30 and the inner surface 9 in section 17 of the housing 1, shown in figures 1, 4, 5.

The metering device 25 includes a throttle groove 33 on the end face 34 of the annular piston 6 in contact with the sealing sleeve 31, and the sealing sleeve 31 forms a part 17 of the housing 1 an annular flow channel 35 shown in figures 1, 4, 5.

The bypass sleeve 30 includes an outer annular collar 36 in the pressure chamber 13, the annular piston 6 has an internal annular shoulder 37 from the side of the damper chamber 14, and the sleeve 30 is made with longitudinal slots 38, and the passage 39 of the annular piston 6 from the end face 40 of the sealing sleeve 31 in contact with the bypass sleeve 30, to the outer annular collar 41 by-pass sleeve 30 exceeds the distance 42 from the end 34 of the by-pass sleeve 30 directed toward the damper chamber 14, to bliin the first edge 43 of each of the longitudinal slits 38, shown in figure 4

The edges 44 of the longitudinal slots 38 on the bypass sleeve 30 from the pressure chamber 13 is located between the ends 41 and 45 of its annular collar 36, while the bypass sleeve 30 has a free passage 46 to rest on the upper thrust collar 4 formed increased belt 47 part 20 of the spindle 2, as shown in figure 4.

The annular piston 6 is made flexible in the radial direction of the annular end face 48 formed by the cavity with an inner cone 49, a larger diameter of which is directed to the pressure chamber 13, and a hard damping part (from the end face 34), directed to the damper chamber 13 and the outer surface 50 of the annular piston 6 is made in the form of a cone, the base of which is situated on either side of the damper chamber 14, while the smaller diameter of the cone 50 is located on the side end face 34 directed toward the damper chamber 14, and is equal, for example, the outer diameter 51 of the sealing sleeve 31, as shown in figure 4.

Throttle groove 33 on the end face 34 of the annular piston 6 is oriented in the tangential direction relative to the outer diameter 32 of the by-pass sleeve 30 and relative to the inner surface 52 of the annular piston 6 in contact with outer diameter 32 of the by-pass sleeve 30, as shown in figure 4, 5.

The tubular body 1 made of slotted module 15 and the parts 17, 18, connected to a threaded adapter 16 and the inner surface of the adapter 16 is made with a band of enlarged diameter 53 and forms dominou cavity 54, covering the outer surface 55 of the spindle section 20, while Domina cavity 54 is filled with working fluid and connected with the pressure chamber 13 of the throttle annular gap 56 between the outer surface 55 of the part of the spindle 20 and the inner surface of the threaded adapter 16, shown in Fig.6.

In parts 17, 18 of the housing 1 from the side of the damper chamber 14 formed by the buffer cavity 22 and the damper chamber 14 is tightly fitted with a slidable piston ring 23, the insulating damper chamber 14 from the buffer cavity 22, while the buffer cavity 22 is connected through the annular orifice channel 57 between the body portion 18 (threaded sub) and part of the spindle 21 with a cavity 58 within the tubular parts of the housing 15, 16, 17, 18 and parts of the hollow spindle 19, 20, 21, in the inner cavity of which is pressure drilling fluid, where the POS. 59 shows the direction of its flow, shown in figure 1, 2, 6.

While figure 1 shows: POS - drums end portion 20 of the spindle 2, which is connected by threads 61 splined part 19 of the spindle 2; POS - slotted end of the slotted module 15 of the tubular body 1.

In addition, figures 1, 2, 3, 4 shown: POS. 63 - threaded tubes and channels for pouring and pumping the working fluid in the pressure chamber 13 and the damper chamber 14; POS technology size for installation slidable Porshnev the ring 23, isolating damper chamber 14 from the buffer cavity 22 during the filling of the working fluid; POS - superwomen hole (with filter) to reduce the differential pressure on the seals 11 moving parts part 20 of the spindle 2 and the spline module 15 of the tubular body 1; POS - end portion 19 of the spindle 2; POS - end spline module 15 of the tubular body 1.

When assembling the hydraulic jar hollow spindle 2 vidvigayt in the tubular body 1 to the stop face 66 of the portion 19 of the spindle 2 in the end face 67 splined module 15 of the tubular body 1.

The Assembly of the hydraulic jar is conducted so that the end face 37 of the annular piston 6 in contact with the end face 41 of the by-pass sleeve 30, the end face 45 of the by-pass sleeve 30 in contact with the thrust collar 4 part 20 of the spindle 2, essentially, to the annular piston 6 and the bypass sleeve 30 is pressed against the end face of the thrust collar 4 part 20 of the spindle 2, at a certain position of the piston ring 23 with the technological size 64, isolating damper chamber 14 from the buffer cavity 22 during the filling of the working fluid.

Between the end face 34 of the annular piston 6, and the end of the bypass sleeve 30 and the end face 40 of the sealing ring 31 is formed an annular gap, the magnitude is equal to the gap 46 between the flange 45 by-pass sleeve 30 and the thrust collar 4 part 20 of the mandrel 2, and the longitudinal slit 38 in the bypass sleeve 30 can proposterous fluid when filling and bleeding the pressure between the chamber 13 and the damper chamber 14.

The pressure chamber 13 and the damper chamber 14 through the threaded hole of the tube 63, turned up, filled with working fluid, such as transmission oil SAE W80-140 (SAE J 306, the USA and Western Europe)produce a pumping fluid, periodically raising and lowering one of the edges to remove air, and then produce a tightening of the tubes 63.

When filling the transmission with oil volume of the pressure chamber 13 is 7,33 l, and the volume of the damper chamber 14 is 14,65 l, which is less than the value of ΔVp- volume, characterized by the passage 26 of the spindle 2 with the annular piston 6 relative to the housing 1 from the beginning to increase the pressure of the working fluid in the pressure chamber 13 to the discharge pressure in the damper chamber 14.

Hydraulic Yas usually works in tandem with hydromechanical Yas installed closer to the borehole bottom, while for the large concentration of mass directly above the jars, essentially, where the maximum speed at the release of the jar or the completion stage of its free movement, use a heavy-weight drill pipe (UBT).

Determine the best position of Yas in the Assembly of the drill string, thus take into account many factors, some of which are:

- the expected type of stuck; stuck due to differential pressure or mechanical;

- the state trajectory and Hugo the inclination of the wellbore;

the configuration of the downhole composition;

- pressure pump;

- the ratio of buoyancy mud;

- the value of maximum load on the bit;

allowable tension on the drill string;

- the tensile strength of the drill pipe.

Hydraulic Yas connect thread 7 of part 19 of the spindle 2 with the bottom of the upper part of the drill pipe used in drilling oil wells, and a threaded shank 8 of part 18 of the housing 1 connected with the top of the lower part of the drill pipe, which is located below the jar. The hydrostatic pressure of the drilling fluid inside the spindle 2 and the tubular housing 1, supplied from the wellhead to the bit in the direction 59, can be up to 50 MPa.

The movement of Yas at the initial stage is constrained by the hydraulic couple: the hollow spindle 2 - ring piston 6 - tubular casing 1 and supported up until the drill column will not be created sufficiently high tensile stresses. Stage free vertical movement of parts inside the jar is intended for abrupt withdrawal of part of the tensile stresses accumulated in the string of drill pipes.

This stress relieving the drill pipe string is used to accelerate UBT and(or) the total weight of the drill string and create a shock pulse in the borehole depth within the percussion section Dunn is th hydraulic jar.

Wave voltage in the string of drill pipes arises due to the sudden stop of the moving mass of the sleeves and the collar, while the kinetic energy is converted to the energy of the stress state. Wave voltage simultaneously moves up to the sleeves and the collar and down to the point of sticking. Wave voltage, which is transmitted upward to the couplings or heavy weight, will move up until then, until you reach the designated change in cross-section, such as moving from couplings to the heavy weight and UBT. Then it will be reflected down. Wave voltage, which originally was moving down from the jar reaches the place of sticking and bounces back up. After some time, the combination of stress waves in place of sticking determines the value of the maximum applied load. Usually, the more shock pulse applied to the place of sticking, the less shock. However, the more dynamic impact, the less shock pulse. Need and impact and momentum.

For immediate release designated sticking requires a certain impact force. At that time, when the impact force exceeds the force of privacyware, the momentum of the blow causes slippage designated sticking. The impact force is the main factor. Best value requires a certain dynamic impact with sufficient shock pulse, essentially, ultra-high the shock power.

Optimal location of hydraulic Yas above the transition zone, however, the jar can be omitted and below the transition zone.

Hydraulic Yas lowered into the well with so many UBT, which provides the necessary pressure on the bit and provides the location of the jar above the transition zone.

The bit load pick up, adding or removing the collar under the hydraulic jar and save on Yas weight, sufficient to provide an effective shock Yas.

Hydraulic jar works from the movement of the drill string in the upward direction. The magnitude of the impact force directed upwards, is directly proportional to the applied tension force.

If the release of stuck in the borehole is the circulation of the drilling fluid, the pressure drop across the bit creates stress, tensile Yas, thus take into account starting of the pump, as it reduces the force needed to strike the jar up.

To compensate for the loss of friction in the borehole curved columns of drill pipe in an inclined aimed well, you need more tension on the drill pipe string.

The amount of compensation to take into account the indications of the load on the bit during descents and ascents to the sticking of the drill string. The weight of the free column is the weight of the column, raspolojennaya the jar.

Hydraulic jar works as follows. The principle of its action is based on creating a high pressure in the pressure chamber when the tension (lifting device on the rig) of the drill pipe stuck (jammed in the borehole) and instant, for example within 15 MS, reset high pressure from the pressure chamber in the damper chamber for stress relaxation in the stretched drill pipes, leading to ultra high impact power in a well designed from the bottom up.

Calculate the tension force of the drill string by a certain method, for example, the calculation effort is 42±1% by weight of the collar to the point of sticking. The tension on the drill pipe moves in the direction from the bottom to the mouth of the bore of the hollow spindle 2, the axial end face 5 of part 21 of the spindle 2, the sealing sleeve 31 and the annular piston 6 with the bypass sleeve 30 on the stroke 26 in the pressure chamber 13.

Due to the fact that the pressure chamber 13 of the annular piston 6 provided with an internal cavity in the form of a cone 48 and the elastic in the radial direction of the annular region 49, the outer surface of the annular piston 6 is made in the form of a cone 50, the base of which is situated on either side of the damper chamber 14, and the smaller diameter of the cone on the outer surface of the annular piston 6 is equal to, for example, the outer diameter weplayminimal sleeve 31, provides the effect of "self-packing", which increases with the pressure of the working fluid in the pressure chamber 13, and the seal provides a very high pressure up to 250 MPa.

Increasing the pressure of the working fluid through the longitudinal slit 38 on the bypass sleeve 30 from the pressure chamber 13 is limited to throttle the flow in the gap between the outer surface 32 of the by-pass sleeve 30 and the inner surface of the annular piston 6 on the length 42, next to the throttle groove 33 on the end face 34 of the annular piston 6 is oriented in the tangential direction relative to its inner surface 52 in contact with the bypass sleeve 30, thus increasing the stability of the throttle flows of the working fluid by increasing the length of the choke grooves 33 to slow the movement of the working fluid increases the accuracy of the time delay created by the hydraulics to attack to stroke hydraulic jar was delayed for the time required to produce the required tension of the deployed column to kick the desired strength.

Improving the accuracy of time delay generated by hydraulics to strike up, with the optimal ratio between the shock and the shock pulse, allows the operator to drill Senate allowable power tension on the drill string, then apply the brake drawworks. As a consequence, the force upon release of the clamping strap is easily controlled, prevented damage to hoisting equipment.

When the approach is flexible in the radial direction of the annular region 49 of the annular piston 6 in the transition area between the cylindrical surface 9 and the belt enlarged diameter 10 of part 17 of the housing 1 o-ring piston 6 instantly, essentially, within 15 MS is discharged from the high pressure working fluid in the pressure chamber 13.

Upon release of pressure in the damper chamber 14 is the impact of the end face 60 of the portion 20 of the spindle 2, which is connected by threads 61 splined part 19 of the spindle 2, the slotted end 62 splined module 15 of the tubular body 1, while a stretched column of drill pipe instantly, essentially, over time 35 MS loses tension strains, and in pipes and pipe joints occurs the effect of stress relaxation, leading to ultra high impact power and blow in the hole directed upward.

With a sharp movement of the drill pipe, as well as in the case of hydraulic surges in the borehole, the pressure chamber 13 and the damper chamber 14, the working fluid at high pressure in dominos cavity 54, dampens pressure surges and prevents the destruction of hydraulic the sa and the drill pipe string in the borehole, and provides centering of the spindle 2 in the housing 1 through the same ring gap 56 and leaks hydraulic wedge" of dominos cavity 54 covering the outer surface 55 of the portion 20 of the spindle 2 to the throttle channel defined by the annular gap 56, and then into the pressure chamber 13 between the threaded adapter 16 and part 20 of the spindle 2 when the discharge pressure of the working fluid that prevents the destruction of, for example, the "fins" of the chrome coating on the contacting each other (mirror) surfaces of the spindle 2 and the housing 1.

When lowering the drill spindle 2 telescopically slide into the housing 1, the end face 37 of the annular piston 6 is in contact with the end face 41 of the by-pass sleeve 30, the end face 45 of the by-pass sleeve 30 is in contact with the thrust collar 4 part 20 of the spindle 2, essentially annular piston 6 and the bypass sleeve 30 are pressed against the end face of the thrust collar 4 part 20 of the spindle 2, at a certain position of the piston ring 23, the insulating damper chamber 14 from the buffer cavity 22.

Between the end 34 of the annular piston 6 and the end of the bypass sleeve 30 and the end face 40 of the sealing ring 31 is formed an annular gap, the magnitude is equal to the gap 46 between the flange 45 by-pass sleeve 30 and the thrust collar 4 part 20 of the spindle 2, and a longitudinal slit 38 in the bypass sleeve 30 allowing the working fluid pressure from the chamber 13 into the damper chamber 14, when this hydraulic jar is ready for application of the next hit, affecting up in place of sticking columns.

1. Hydraulic jar comprising a tubular body and a hollow inner spindle connected without rotation between them, for example, splined connection, the spindle is formed by upper and lower thrust collars, between which is mounted an annular piston, the inner cavity of the case is made in the form of a cylindrical surface with a band of enlarged diameter for engagement with the annular piston, between the housing and the spindle is installed seal movable and immovable joints and formed pressure and damping chamber filled with a working fluid in the housing from the side of the damper chamber is formed by the buffer cavity and the damper chamber is installed with a slidable piston ring, isolating damper chamber from the buffer cavity between the housing and the spindle is formed throttle channel and contains retiree device, and includes a dosing device, which transmits a limited amount of working fluid with the movement in the throttle channel, characterized in that retiree device made in the form of a bypass sleeve placed inside the annular piston, and a sealing sleeve located by damping the cavity, which concentrically and tightly fitted with the possibility of axial stroke between the thrust shoulders of the spindle and sliding spindle, and(or) and(or) case, while the metering device made in the form of at least one of the throttle groove on the end of the annular piston between the contacting with each other by the ends of the piston and the sealing sleeve and the sealing sleeve forming with the casing an annular flow channel, with the bypass sleeve includes an outer annular shoulder in the pressure chamber, an annular piston has an internal annular shoulder side of the damper chamber and the bypass sleeve in the middle parts are made with longitudinal slots, and the piston stroke from the end of the sealing sleeve in contact with the bypass sleeve, to the outer ring clamp bypass sleeve exceeds the distance from the end of the bypass sleeve directed toward the damper chamber to the middle region of each longitudinal slit.

2. The hydraulic jar of claim 1, wherein the tubular body is made of upper and lower housings, connected to a threaded adapter and screw the adapter contains at least one dominou cavity, which is connected with the pressure chamber through the annular orifice channel between the threaded adapter and the hollow spindle.

3. Hidraulicas the s Yas according to claim 1, characterized in that the annular piston is made flexible in the radial direction of the annular end face formed with a cavity with an inner cone, the larger diameter of which is directed to the pressure chamber, and with hard damping part, directed to the damper chamber, while the outer surface of the annular piston is made in the form of a cone, the base of which is situated on either side of the damper chamber.

4. The hydraulic jar of claim 1 or 2, characterized in that the throttle groove on the end of the annular piston is oriented in the tangential direction relative to the diameter of the bypass sleeve.



 

Same patents:

FIELD: oil and gas industry, particularly for freeing stuck downhole equipment.

SUBSTANCE: device comprises at least two hydraulic power cylinders, hydraulic anchor, overflow circulation valve having body connected to anchor body by means of shear pins and hollow stem connected to fishing string. Hydraulic separators having floating gaskets are installed between hydraulic power cylinders, as well as between anchor and hydraulic power cylinder. One hydraulic power cylinder comprises spring-loaded piston and consists of two cylinders provided with threads. Pistons of all hydraulic power cylinders have annular sealing means and annular groove for lubricant receiving. Orifices, which communicate hollow stem interior with hydraulic power cylinder and anchor interiors, are created in front of each hydraulic power cylinder and hydraulic anchor inside hollow stem. Orifices located in front of hydraulic power cylinders have diameters less than that of orifices formed in front of hydraulic anchors. Lower stem part is provided with seat for free-falling sealing ball receiving and connecting tread for fishing tool connection. Lower stem part is connected to valve body.

EFFECT: simplified structure along with technical capability retention.

1 dwg

Hydromechanic jar // 2284405

FIELD: drilling equipment, particularly to prevent drilling tool sticking in well.

SUBSTANCE: hydromechanic jar comprises hollow body with inner and outer axial anvils and hollow rod with inner striker installed in the body and adapted to perform axial movement. The inner striker is prevented from rotation with respect to the body. Upper sub with outer striker, piston, thrust with hollow stem and separating piston slidably installed on the hollow stem, as well as movable and fixed connector sealants are arranged on the hollow rod. Lower part of the hollow body is made as annular cylinder with two working borings having different diameters and adapted for periodical body aligning with piston. Lower and upper hollow body parts are filled with liquid lubricant. Unit, which excites circular and radial vibration, is fixedly connected to the hollow body and made as multilobe gerotor mechanism having inner helical engagement means. Unit includes stator fixedly fastened to body, hollow rotor with through axial channel arranged inside the stator and performing off-center rotation inside it, axial support for hollow rotor, free fall ball or plug adapted to close axial rotor channel, as well as connection and lower subs. Radial strikers adapted to cooperate with annular anvils are formed on hollow rotor ends.

EFFECT: increased reliability and service life.

3 cl, 10 dwg

FIELD: oil and gas well drilling and overhaul repair, particularly to remove tubing and drilling strings, packers and other equipment stuck in cased wells.

SUBSTANCE: hydraulic jack connected to fishing string of tubing or drilling pipes to be lowered in well comprises hydraulic power cylinders, hydraulic anchor, shaft including facetted rod in nipple having mating profile and connected to the body. Discharge valve is installed over power cylinders so that the valve may cooperate with upper shaft end. Upper shaft end is provided with telescopic pusher. The shaft is hollow along the full shaft length. Facetted rod is connected to sub having seat for check valve ball receiving and flushing pipe. Discharge valve is made as spring-loaded piston with sealing collar. Telescopic pusher consists of guiding bush and sliding collet.

EFFECT: increased efficiency and reliability.

2 cl, 4 dwg

Hydraulic jar // 2272122

FIELD: oil production industry, particularly for underground well repair to release stuck tool.

SUBSTANCE: device comprises cylinder having bored portion, cylinder, piston connected to traction and compensating rods and sealed with gaskets. Device also has bush with outer flat installed over the piston on compensating rod. The bush and piston end define annular gap with slot-like channel formed in bottom thereof. The device also has valve unit with shutoff member arranged in the annular gap and made as O-ring of elastomeric material. The shutoff member closes liquid flow directed from cavity located above the piston to cavity under the piston. The piston is spaced from the cylinder. Channel, which communicate cylinder cavities divided with piston, is made as annular space between compensating rod and piston and may be connected with slot-like channel.

EFFECT: simplified structure and increased reliability.

2 dwg

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The invention relates to the oil and gas industry and is designed to release the stuck pipe string during capital repair of wells

The invention relates to the oil and gas industry and can be used to release the pipe string during drilling and workover

Amplifying device // 2164584
The invention relates to the drilling technique, namely to the amplifying devices for hydraulic shock mechanisms used to eliminate sticking, simplifies the design and increases the reliability of the device

Hydraulic jar // 2272122

FIELD: oil production industry, particularly for underground well repair to release stuck tool.

SUBSTANCE: device comprises cylinder having bored portion, cylinder, piston connected to traction and compensating rods and sealed with gaskets. Device also has bush with outer flat installed over the piston on compensating rod. The bush and piston end define annular gap with slot-like channel formed in bottom thereof. The device also has valve unit with shutoff member arranged in the annular gap and made as O-ring of elastomeric material. The shutoff member closes liquid flow directed from cavity located above the piston to cavity under the piston. The piston is spaced from the cylinder. Channel, which communicate cylinder cavities divided with piston, is made as annular space between compensating rod and piston and may be connected with slot-like channel.

EFFECT: simplified structure and increased reliability.

2 dwg

FIELD: oil and gas well drilling and overhaul repair, particularly to remove tubing and drilling strings, packers and other equipment stuck in cased wells.

SUBSTANCE: hydraulic jack connected to fishing string of tubing or drilling pipes to be lowered in well comprises hydraulic power cylinders, hydraulic anchor, shaft including facetted rod in nipple having mating profile and connected to the body. Discharge valve is installed over power cylinders so that the valve may cooperate with upper shaft end. Upper shaft end is provided with telescopic pusher. The shaft is hollow along the full shaft length. Facetted rod is connected to sub having seat for check valve ball receiving and flushing pipe. Discharge valve is made as spring-loaded piston with sealing collar. Telescopic pusher consists of guiding bush and sliding collet.

EFFECT: increased efficiency and reliability.

2 cl, 4 dwg

Hydromechanic jar // 2284405

FIELD: drilling equipment, particularly to prevent drilling tool sticking in well.

SUBSTANCE: hydromechanic jar comprises hollow body with inner and outer axial anvils and hollow rod with inner striker installed in the body and adapted to perform axial movement. The inner striker is prevented from rotation with respect to the body. Upper sub with outer striker, piston, thrust with hollow stem and separating piston slidably installed on the hollow stem, as well as movable and fixed connector sealants are arranged on the hollow rod. Lower part of the hollow body is made as annular cylinder with two working borings having different diameters and adapted for periodical body aligning with piston. Lower and upper hollow body parts are filled with liquid lubricant. Unit, which excites circular and radial vibration, is fixedly connected to the hollow body and made as multilobe gerotor mechanism having inner helical engagement means. Unit includes stator fixedly fastened to body, hollow rotor with through axial channel arranged inside the stator and performing off-center rotation inside it, axial support for hollow rotor, free fall ball or plug adapted to close axial rotor channel, as well as connection and lower subs. Radial strikers adapted to cooperate with annular anvils are formed on hollow rotor ends.

EFFECT: increased reliability and service life.

3 cl, 10 dwg

FIELD: oil and gas industry, particularly for freeing stuck downhole equipment.

SUBSTANCE: device comprises at least two hydraulic power cylinders, hydraulic anchor, overflow circulation valve having body connected to anchor body by means of shear pins and hollow stem connected to fishing string. Hydraulic separators having floating gaskets are installed between hydraulic power cylinders, as well as between anchor and hydraulic power cylinder. One hydraulic power cylinder comprises spring-loaded piston and consists of two cylinders provided with threads. Pistons of all hydraulic power cylinders have annular sealing means and annular groove for lubricant receiving. Orifices, which communicate hollow stem interior with hydraulic power cylinder and anchor interiors, are created in front of each hydraulic power cylinder and hydraulic anchor inside hollow stem. Orifices located in front of hydraulic power cylinders have diameters less than that of orifices formed in front of hydraulic anchors. Lower stem part is provided with seat for free-falling sealing ball receiving and connecting tread for fishing tool connection. Lower stem part is connected to valve body.

EFFECT: simplified structure along with technical capability retention.

1 dwg

Hydraulic catcher // 2288344

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

SUBSTANCE: hydraulic catcher includes tubular body and hollow spindle, connected together without possible rotation. Upper and lower stopping collars are formed on spindle, between which a ring-shaped piston is mounted. Internal surface of body is made in form of cylindrical surface with a band of extended diameter for interaction with piston. Between body and spindle, seals of moving and immoveable connections are mounted, and also forcing and damping chambers are formed, filled with working liquid. Buffer hollow is formed in the body on the side of damping chamber. Piston ring is mounted in damping chamber with possible sliding, isolating damping chamber from buffer hollow. Between body and spindle, throttling channel is formed and a caging device is contained, and also a metering device, letting through a limited volume of working liquid during movement in throttling channel. Caging device is made in form of overflow bushing, positioned inside the piston, and packing bushing, positioned on the side of damping hollow. Metering device is made in form of at least one throttling groove on the end of piston between ends of piston and packing bushing in contact with each other. Packing bushing forms a circular running channel together with the body. Overflow bushing contains external circular collar in forcing chamber. Piston contains internal circular collar on the side of damping chamber. Overflow bushing in middle part is made with longitudinal slits. Drive of piston from the end of packing bushing, contacting the overflow bushing to external circular collar of overflow bushing exceeds distance from the end of overflow bushing, directed towards the damping chamber, up to close edge of each longitudinal slit.

EFFECT: increased efficiency when freeing pipes, increased reliability and resource.

4 cl, 6 dwg

Hydraulic catcher // 2291275

FIELD: underground (fundamental) maintenance of wells, possible use for extracting equipment stuck at the face.

SUBSTANCE: device contains body and spindly connected to working column and object being freed, connected by screw couple to lifting angle, providing for its non-self-braking mobility and forming a "cylinder-piston" couple with hollow, filled with liquid with forming a part of hollow in bored interval of cylinder. Connection of body and spindle is made with possible induction of angular and axial acceleration onto working column with following application of torsion and axial strike. When torsion strikes are required in reverse direction screw couple is made with reverse thread.

EFFECT: increased efficiency of operation, expanded functional capabilities.

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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