DE1230383B - Drilling fluid throttle valve - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

E21b

German class: 5 a - 21/00

Number: 1230 383

File number: B 86502 VI a / 5 a

Filing date: April 2, 1966

Opening day: December 15, 1966

The invention relates to a shut-off device which is used to throttle the flow of drilling fluid from an oil well can be used to create a back pressure against the borehole. The shut-off device comprises a cylindrical valve member made of flexible material which is provided with an axial passage is provided for the liquid and is axially compressed and narrowed radially inward can be, such that the cross section of the liquid passage is reduced and thereby the desired Throttling effect is achieved.

The flexible valve member is provided at its ends with a pair of pushing or stop members, so that the axial compression can be performed accordingly. One of these shock or stop organs is firmly attached in the housing of the shut-off element, while the other shock or stop element is arranged displaceably. One of the essential features of the invention is the arrangement the thrust members, which are firmly connected to the flexible valve member, so that they can be through the Fluid pressure inside the shut-off device cannot be moved. The present invention creates improvements in the construction of the shut-off device, including the previously mentioned feature included regarding the fixed connection of the shock or stop members with the flexible valve member is.

In the shut-off device according to the invention, an axial compressive force is exerted on the flexible valve member, the power transmission through fluid pressure or in a somewhat modified form mechanical action takes place. It is also provided that the shut-off device is equipped with a wear-resistant one To provide covering which is disposed adjacent to and downstream of the flexible valve member is to protect essential components of the shut-off device against wear and tear through the passage Protect liquid.

In the following the object of the invention with reference to the drawings, in which embodiments are shown, described in more detail. The same parts are given the same reference symbols Mistake.

F i g. 1 is a longitudinal section through a shut-off device according to the invention in its completely open Position;

F i g. 2 is a partial longitudinal section through the shut-off element in a partially closed position;

F i g. Figure 3 is a longitudinal section through a modified embodiment of the valve in its open Position;

Drilling fluid throttle valve

Applicant:

Bass Brothers Enterprises, Inc.,

Fort Worth, Tex. (V. St. A.)

Representative:

Dipl.-Chem. I. Schulze

and Dipl.-Ing. E. Gutscher, patent attorneys,

Heidelberg, Gaisbergstr. 3

Named as inventor:

Phil. H. Griffin, Fort Worth, Tex. (V. St. A.)

Claimed priority:

V. St. ν. America May 6, 1965 (453 663),

of February 1, 1966 (524 061)

F i g. 4 is a view in the direction of arrow 4-4 in Fig. 3;

F i g. 5 is a perspective view of the throttle assembly as used in the embodiments according to FIG F i g. 3 and 4 is used, the flexible valve member and associated thrust members are shown;

Fig. 6A is a partial longitudinal section showing the inlet end portion shows another embodiment of the shut-off device in its throttling position;

Fig. 6B is a partial longitudinal section showing the outlet end portion Figure 6A shows the valve design of Figure 6A;

F i g. 7 is a partial longitudinal section, similar to the view in FIG. 6A, but of a further embodiment;

F i g. 8 is a partial longitudinal section similar to that in FIG. 7, another embodiment.

The F i g. 1 and 2 show a drilling fluid throttle valve, indicated generally at 10 . This consists of a cylindrical housing 11 which is provided with releasable screw closures 12 and 13 at its ends. The closure 12, which is located at the end of the housing which may be referred to as the inlet, is formed integrally with a tubular extension 12 ' which protrudes into the housing and forms an inlet 14.

609 747/56

3 4

which in turn gives with an inlet pipe 15 in, but not in with the interior of this pipe

Connection is that of the bore (not shown- connection. The chamber 33 is designed so that

directly to the valve. that they are through a hose or a line 34

Adjacent to the closure 12 is a solid one from a hydraulic or pneumatic source Absorbing impact or stop element 16 in a certain 5 (not shown) liquid under pressure

Position fixed in the housing, which can by one that is completely independent of the flow

appropriate connecting ring 17 held in position fluid (drilling fluid) through the throttle valve

will. This ring includes annular lugs or goes.

Projections 18,19 on the element 16 or on the It is clear that hydraulic or pneumatic Extension 12 'of the closure 12 provided 10 fluid which is under pressure through the line 34 in are. The impact element 16 has a central through which the pressure chamber 33 is guided, between which the outlet or through-flow channel 20, which with the relatively fixed partition wall 25 and the Inlet 14 in the extension 12 'of the closure displaceable piston 23 acts and causes

12 and with an axial passage 21 in one that the piston is aligned with an axial pressure or impact on valve member 22, as in the following i ₅ exerts the flexible valve member 22 and the latter is described in more detail. deformed radially inward, so that the cross-section

The valve member 22 is cylindrical and the passage 21 is narrowed. Eventually consists of a corresponding pliable mate- seepage or leakage of the hydraulic or rial, such as rubber, neoprene or the like. Its external pneumatic fluid into the chamber 33 through diameter corresponds to the inner diameter of 20 the pipe 28 is through the sealing means 31, 32 Housing 11, in which the member 22 is arranged, prevented, so that this liquid does not come with the such that one of its ends to the impact element through the valve flowing liquid in the 16 triggers. The other end of the valve member 22 chamber 26 is mixed. At the same time will stands with a second impact or stop element, the sliding, through the displacement of the piston 23 in contact, which has the shape of a piston 23-caused movement of the tube 28 through the separator and is slidably mounted in the housing U. This wall 25 facilitates the connection between the Piston is provided with a central passage 24, the interior of tube 28 and exit chamber 26 is maintained in alignment with the passage 21 in the valve member 22.

is. The valve member 22 is flexible in such a way that it is particularly pointed out that it is under the action of an axial pressure through 30 impact element 16 and the piston 23 with the ends of the piston 23 in the direction of the impact element 16 of the flexible valve member 22, for example through axially compressed and radially inwardly vulcanized, firmly connected. Since the impact is pressed or deformed in such a way that the transverse element 16 and the adjacent section of the passage 21 connected thereto is narrowed, as in the end section of the link 22 by the means 12, 12 'essentially in FIG. 2 is shown. When the 35 and 17 held in a fixed position weraxiale pressure force is interrupted, take t that the, they are not moved by pressure in the interior of the valve valve member 22 due to its elasticity, its arrival, and neither by the hydraufangsform, and Passage 21 is fully open or pneumatic pressure in the chamber, as in FIG. 1 is shown. 33 still by the flow pressure from the borehole.

At a distance from the piston 23 and from the closure 40 So must the entire compression of the valve member

13 on the output side of the housing is a separator 22 by the hydraulic or pneumatic wall 25 attached. It can be effected on the housing 11, for example liquid pressure in the chamber 33, be welded wisely. and the valve is such that in general

This partition wall 25 is integral with a "fail open valve" as a "fail open valve"

their formed central sprue 25 ', which is designated 45.

protrudes into a chamber 26 which, as a liquid- It is also provided, the valve member 22 zuauslaßkammer can be designated and in the next much longer to train than necessary so Housing between the partition wall 25 and the exit, the excess length serves as a "reserve" that is used for gear end closure 13 is located. The shutter 13 is replaced by erosion or wear and tear equipped with a sludge outlet pipe 27, can be used by 50 loose parts. To this which the mud to the mud hole, swamp or way, the shut-off device can have a much larger one Tank of the bore (not shown) returned to be used than when the period will. The pipe or line 27 is of course exactly the same as the initial length of the valve member 22 with the chamber 26 in connection. has the required length.

A liquid passage pipe 28 is in the flow through 55 The combination of the above-mentioned "reserve" -

flow channel 24 of the piston 23 fixed such that the length of the valve member 22 and the connection of the

it slips with the latter. The tube 28 extends elements 16 and 23 with this causes an un-

displaceable through a homely design in the middle of the partition wall 25 in the constriction of the

arranged bore 29 and through a counterbore passage 21, if the hydraulic or pneumatic

tion 30 in the sprue 25 'of the partition, such as 60 matic liquid under pressure in the chamber 33

that the outer end of the tube 28 is let into the outlet. Such a constriction takes place

chamber 26 protrudes and communicates with it. In the two longitudinally spaced locations 21 '

Counterbores 30 are useful stuffing boxes of the passage 21, with a widened area

packings 31 and a sealing screw 32 forward 21 "between the two constrictions, as in

seen to reduce the leakage of liquid by the 65 essential in FIG. 2 is shown.

Tube 28 to prevent. Part of the housing 11 It should also be noted that the throttle

The reversing valve is arranged axially between the piston 23 and the partition wall 25, so that a rectilinear

closes a pressure chamber 33 which surrounds the pipe 28- flow of drilling fluid from one to the other

End of the valve takes place, thereby avoiding wear and tear, phenomena that occur with the usual valves where the flow is diverted.

The modified embodiment of the throttle valve according to FIGS. 3 to 5, this in general is designated 40, consists of a cylindrical housing 41, at one end with a Flushing inlet 43 provided flange 42 is attached. The flange part 42 also has an external thread provided intermediate piece 44 which protrudes into the housing 41. The throttle assembly 45 is located located in the housing 41 and consists of a cylindrical valve member 46 made of flexible material, the ends of which, for example, by vulcanization or the like, are firmly connected to a pair of connecting links 47, 48 are. The push or stop member 47 can be referred to as the fixed element and has an internal thread at 49 into which the intermediate piece 44 engages and so the impact or stop member 47 holds in a fixed position in the housing 41. The push or stop member 48 is in the housing arranged displaceably and provided with an internal thread 50. Both push or stop links 47, 48 are provided with passages 51 which are aligned with the axial fluid channel 52 in the valve member 46 are. If now the push member 48 is moved in the direction of the member 47, the valve member 46 axially compressed and deformed radially inward, such that the cross section of the liquid passage 52 is narrowed.

An intermediate piece provided with a thread engages in the internal thread 50 of the displaceable thrust member 53 'of a piston 53, which in turn slides in the housing 41 and with a corresponding sealing ring 54 is provided. The piston 53 has a central passage 55 which communicates with the passage 51 of the push member 48 is aligned. The piston 53 is internally threaded, as at 56 is shown, into which the external thread of the liquid supply tube 57 fits. The pipe 57 protrudes to the outside of the housing 41 through a hub or a threaded ring 58 which has an internal thread and is rotatably disposed in an opening in the end wall 41 'of the housing 41. On the inside of the end wall 41 ', the threaded ring 58 is provided with a flange 58', and outside the end wall 41 'is a appropriate handwheel 59 attached to the threaded ring. The tube 57 is prevented from rotating Means described below kept. The rotation of the handwheel 59 together with the threaded ring 58 causes the tube 57 to move axially with respect to the housing 41. when the wheel 59 is rotated in one direction to move the tube 57 into the housing, the slidable Push member 48 compress the valve member 46 so that the desired throttling is effected will. Conversely, when the wheel 59 rotates in the opposite direction, the valve is opened. To this Way, the shut-off element 40 is controlled by mechanically operated means, in contrast to that with Liquid-actuated shut-off element 10. If necessary, the piston 53 can be omitted. In In this case, the tube 57 can directly into the thread 50 of the thrust member 48 - that is, not into the thread 56 of the piston - to be screwed in. The housing 41 is provided with a remote arm 60, which leaves the handwheel 59 free and carries an extension 61 of the housing, which is coaxial with the housing 41 lies. The extension 61 is attached to the arm 60, for example by bolts or screws 62. The liquid supply tube 57 extends into the extension 61 of the housing to supply liquid to let out of the valve, e.g. B. at 63. In this extension 61 is a suitable one around the pipe Sealing ring 61 'arranged. The housing extension 61 is provided on its inside with a pair of longitudinal grooves 64 into which slidably protruding tabs 65 engage the end flange 66 of the tube 57. This prevents the Turning the handwheel 59 turns the pipe together with the threaded ring 58.

In the operation described, the liquid passes through the valve 40 from the inlet 43 to the outlet 63. If desired, however, the direction of the flow can be reversed, as this is inevitable acting mechanical arrangement 57, 58, 59 is able to maintain a desired throttle size, regardless of the direction of the liquid flow.

Another embodiment of the valve is shown in Figures 6A and 6B and is general designated by 70. This training is particularly characterized by the fact that it is the valve gives a longer service life, especially because it protects against wear and tear, Provide protection for phenomena caused by the passage of liquid. The valve 70 consists of a tubular housing 71 which has a closure at one end 72 is provided. An inlet 73 for the liquid passes through this closure. To get between the shutter and preventing the liquid from seeping through is a useful seal 74 provided in the breech. The other end portion of the housing 71 on which a flange 75 is arranged is narrowed as shown at 76. Through the flange 75 and through the shutter 72 go along the outside of the housing 71, corresponding connecting bolts or rods 77 therethrough and serve to hold the lock in place.

The throttle assembly, indicated generally at 78, consists of a cylindrical valve member 79 made of flexible elastic material, which is provided with an axial passage 80 for liquid is. The valve member in Fig. 6A is in the throttle position shown so that the passage 80 appears narrowed. One end part of the flexible valve member 79 is non-positive connected to a fixed impact or stop member 81, which in turn on a threaded spacer 82 is attached. This intermediate piece is fixed to the closure 72 connected. The shock or stop member 81 is provided with a central passage 83, which with the Passage 80 is aligned.

The other end portion of the valve member 79 is frictionally engaged with a tubular sheath or Cuff 84 connected, which is a part of a slidable thrust member or piston 85 and with this is screwed. The sleeve or cuff 84 is used to push the valve member 79 to the Throttle flow further up than in valve designs 10 and 40. It has been found that the pressure difference across the throttle causes the flexible material of the valve member against the

The side or end of the low pressure "flows" where the congestion is formed. It was also found that that when the liquid discharge from the throttle is not exactly coaxial with the valve housing occurs, to some degree of wear on all parts of the valve down from the stagnation occurs. However, when the valve member 79 is supported by the sheath 84 further upwards and a tubular lining 86 of wear-resistant material immediately within the shell the congestion is arranged, the piston 85 and the liquid supply pipe connected thereto 87 protected against wear and tear. The tube 87 is further protected by a thin, wear-resistant one Coating 88 with which this pipe is provided. The pads 86 and 88 consist of one suitable material that is very resistant to wear and tear, for example a ceramic substance. The use of two coverings serves to prevent the jet from escaping from the throttle to protect the parts against destruction through wear and tear.

Since the inherent elasticity of the valve member 79 leads to the fact that this after the throttling in his Returning to the original open position, a metal sleeve 89 is inserted into the housing 71 to protect the Friction between the housing and a portion 79 'of the flexible valve member surrounding the shell 84, to reduce. The sleeve 89 slides freely in the housing 71 with the axial movement of the throttle assembly, and serves to eliminate inappropriate friction in that part of the housing in which the compression of the valve member is unnecessary.

The section of the housing 71 between the piston 85 and the housing part 76 forms a pressure chamber 90, into which the corresponding liquid is introduced under pressure through a channel 91 to act against the piston when the valve is to be throttled. On piston 85 are appropriate Sealing means, such as C-flaps 92, 93, are provided to keep liquid from seeping out of the chamber 90 to prevent the piston and also the ingress of borehole fluid avoid the piston when the downhole pressure exceeds the fluid pressure in chamber 90. The liquid supply pipe 87 slidably passes through sealing means 94 arranged in the housing section 76 are, and protrudes into a housing extension 95, which with the housing portion 76, for example by a screw connection 96 is connected.

The extension 95 is provided with a pair of diametrically opposed releasable capsule caps 97 provided to facilitate the removal of the covering 86 without the need would be to put a key on the tube 87. This is done by loosening the connecting bolts 77 and moving the deck and the tube 87 forward achieved, both of which are advanced so far, to the diametrically opposed holes 98 with the openings in the end part of the tube 87 99 are aligned, in which the caps 97 are inserted. With loosened caps 97 a corresponding rod or rod 100 is inserted through the openings 99, 98, to fix the tube 87 against rotation with respect to the extension 95 of the housing, after which the covering can easily be unscrewed.

In the F i g. Figures 7 and 8 show slightly modified embodiments of the device shown in Figure 6A. In particular, the relationship between the lining 86 and the said piston 85 is illustrated here. In FIG. 7 - compared with FIG. 6A - the piston 85a is provided with an integrally formed, tubular extension 89a which takes on the role of the aforementioned sleeve 89. In this case, the sealing shell 92 a is arranged at the front end of the piston extension 89 a adjacent to the valve member 79. The section 79 'of the valve member 79 still protrudes into the space between the sleeve or sleeve 84 and the piston extension 89 a. However, since the extension 89 a is part of the piston 85 a, the lining 86 is located within the piston unit, in contrast to the arrangement according to FIG. 6A, in which this lining is arranged between the piston and the valve member.

In the further modification according to FIG. 8 - compared to FIG. 7 - 85 b having a relatively thick, tubular extension 89 provided b the piston, and the sheath 84 is b considerably shortened, so that the greater part of the coating is b within the piston extension 89 86th

The section 79 ″ of the valve member 79 is shortened accordingly, and the sealing shell 92 ″ is provided at the front end of the piston extension 89 b , in a very similar manner as in the embodiment according to FIG. 7. Here, too, the lining 86 is rather arranged within the piston unit than between the piston and the valve member 79, as is the case in Fig. 6A.

Claims (7)

Patent claims: 1. drilling fluid throttle valve, characterized by an elongated housing (11, 41, 71), at one end in a fixed position a fixed impact or stop member (16,47, 81) is attached, in the housing also a cylindrical valve member (22, 46, 79) made of a flexible Material is used, one end of which is fixed to the fixed impact or stop member (16,47,81) is connected, and that a sliding one Push or stop member (23, 48, 85) with the other end of the valve member (22, 46, 79) is firmly connected. 2. Valve according to claim 1, characterized in that the displaceable impact or stop member is shifted hydraulically. 3. Valve according to claim 1, characterized in that the displaceable impact or stop member is moved mechanically. 4. Valve according to claim 1, characterized in that part of the housing (11) is adjacent forms a liquid chamber (33) on the displaceable impact or stop member (23), which is separate and independent of the liquid passage (21) in the valve member (22), and that a line (34) is provided for supplying liquid under pressure into this chamber. 5. Valve according to claim 1, characterized in that a tubular covering (86) consists of wear-resistant material axially abuts the flexible valve member (79). 6. Valve according to claim 1, characterized in that a liquid passage tube (87) axially arranged in the housing (71) and connected at one end to the displaceable impact or stop member (85, 85 a, 85 b) , and to protect the pipe against wear by the flowing liquid between the downstream end of the flexible valve 10 member (79) and the sliding impact or stop member (85, 85 a, 85 ft) a tubular Cover (88) is provided. 7. Valve according to claims 5 and 6, characterized in that the covering (86, 88) from consists of a ceramic material. For this purpose 2 sheets of drawings