US3419040A - Drill pipe valve having means for rendering it temporarily inoperative - Google Patents

Drill pipe valve having means for rendering it temporarily inoperative Download PDF

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Publication number
US3419040A
US3419040A US60493466A US3419040A US 3419040 A US3419040 A US 3419040A US 60493466 A US60493466 A US 60493466A US 3419040 A US3419040 A US 3419040A
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Prior art keywords
valve
drill pipe
stem
drill
drill string
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Expired - Lifetime
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Edward J Thibodeaux
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EDWARD J THIBODEAUX
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Edward J. Thibodeaux
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10Valve arrangements in drilling-fluid circulation systems
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7854In couplings for coaxial conduits, e.g., drill pipe check valves
    • Y10T137/7857Valve seat clamped between coupling elements
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7866Plural seating
    • Y10T137/7867Sequential
    • Y10T137/7868Resilient gasket
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7876With external means for opposing bias
    • Y10T137/7877With means for retaining external means in bias opposing position
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7904Reciprocating valves
    • Y10T137/7922Spring biased
    • Y10T137/7929Spring coaxial with valve
    • Y10T137/7932Valve stem extends through fixed spring abutment
    • Y10T137/7933Yoke or cage-type support for valve stem

Description

1968 E. J.THIBODEAUX 3,

VALVE HAVING MEANS FOR RENDERIN DRILL PIPE IT TEMPORARILY INOPERATIVE Filed Dec. 27. 1966 a 3 1w 1 f 4 a W m r c 90 5 b 9 M W f, 3 51m 3 "a w 2 5 4/9 7 4 I 3 M 3 V .W r w 3 m a a 1 3 0 3 .D d H H m 6 Q. 3 3% W B r l \y P /A 3 9 5 8 g 4 w 5 2 O 1| 2 7 3 #H II. 2 O M 5m V w \NN EDWARD J. THIBODEAUX INVENTOR.

ATTORNEYS United States Patent O 3,419,040 DRILL PIPE VALVE HAVING MEANS FOR REN- DERING IT TEMPORARILY INOPERATIVE Edward J. Thibodeaux, 2532 Fawnwood Road, Marrero, La. 70072 Filed Dec. 27, 1966, Ser. No. 604,934 3 Claims. (Cl. 137515.7)

ABSTRACT OF THE DISCLOSURE A drill pipe valve having an arrangement so that the valve may be temporarily locked in position away from its seat as the drill pipe is lowered into the well bore to enable the drilling fluid to flow past the valve and fill successive joints of pipe as they are added into the well string and then lowered into the well bore.

BACKGROUND OF THE INVENTION Field of the inventin.The present invention relates particularly to a valve that is to be incorporated in strings of drill pipe for accomplishing several functions. Drill pipe valves comm-only called drill pipe float valves close in an upward direction and open in a downwardly direction to permit downward flow of fluid therethrough. It is generally positioned adjacent the lower end of the drill string in close proximity to the drill bit, and when closed, prevents upward flow of fluid through the drill pipe to thereby minimize what is commonly referred to as blowouts. The drill pipe valve of the present invention is provided with an arrangement so it may be locked in an open position and then inserted in position in the drill pipe so that as the drill pipe is lowered into the well bore joint by joint each joint of drill pipe ma flll rapidly as it is lowered into the well bore. After the drill string has been lowered into the well bore, the pump which communicates drilling fluid to the interior of the drill string is actuated to increase the pressure interiorly of the drill string which causes the drill pipe float valve of the present invention to automatically unlock so that it may move to its normally closed position should an upsurge of fluid in the pipe occur due to a blowout, or for any other cause.

Description of the prior art.In all prior art drill pipe float valves, there is provided no means for rendering the drill pipe float valve inoperative as the drill string is lowcred into the well bore, and thus it is always in a closed position so that as each joint of drill pipe is lowered into the well bore, it must be then filled with liquid before the next joint of drill pipe is added thereto.

This operation is time consuming, and particularly in offshore operations where drilling costs may be extremely high, such procedure is accepted by many as being highly undesirable.

The present invention solves this problem in that the drill pipe float valve may be locked in an open position so that the drill pipe may be more rapidly lowered into position in the well bore and it can be unlocked to function for its intended purpose.

SUMMARY OF THE INVENTION The present invention is directed to incorporating in a valve ordinarily called a drill pipe float valve a means for holding or retaining the valve means in open position as the drill string in which the valve is positioned is lowered in the well bore so that the drill pipe ma automatically fill with drilling fluid or with well bore fluid as the drill pipe is stepwise lowered into the well bore.

An object of the present invention is to provide a means in a drill pipe float valve which may be manually set at the surface before inserting it in the drill string so that the valve will remain in open position as the drill pipe in which it is connected is lowered into the well bore, which valve may be actuated by an increase in hydraulic pressure at the earths surface within the drill pipe to automatically unlock or release the valve from its open position so that it may assume its normal position after the drill string has been lowered to the bottom of the well bore.

Yet a further object of the present invention is to provide in a drill pipe valve having a valve body with a valve seat therein and valve means for engaging on said seat, said valve means having a valve stem extending from the valve and guide means carried by the body for slidably receiving the stern as well as spring means for normally urging the valve means towards closed position, cooperating means on the valve stem and guide means for holding the valve means off the seat as the drill string in which the valve is positioned is lowered into the well bore.

Yet a further object of the present invention is to provide in a drill pipe valve having a valve body with a valve seat therein and valve means for engaging on said seat, said valve means having a valve stem extending from the valve and guide means carried by the body for slidably receiving the stem as well as spring means for normally urging the valve means towards closed position, cooperating means on the valve stem and guide means for holding the valve means ofl? the seat as the drill string in which the valve is positioned is lowered into the well bore, there being means on the lower end of the stern for manually pulling the stern downwardly against the force of the spring and for rotating the stem to engage a projection on the stem Within a slot in the guide means to hold or lock said valve means spaced from said valve seat and in open position.

Other objects and advantages of the present invention will become apparent from the following description and drawings wherein:

FIG. 1 is a sectional view partly in elevation showing a form of the present invention in a drill string with the valve in seated position in the valve body;

FIG. 2 is a sectional view partly in elevation of the valve showing the projection on the valve stem seated in the slot in the guide means for holding the valve in open position; and

FIG. 3 is a sectional view on the line 33 of FIG. 2 and illustrates one form of suitable means for retaining the sleeve fitting within the hub against rotation relative to the hub.

DESCRIPTION OF THT PREFERRED EMBODIMENT The present invention includes a valve means represented at 6 that is provided with means referred to generally at 7 so that the valve may be cocked or locked in position to hold the valve means 6 in spaced relation to the valve seat referred to generally by the numeral 9 in FIG. 2.

Attention is directed to FIG. 1 of the drawings wherein a portion of a drill string or drill pipe is represented 'by the numeral 11. The portion of the drill string represented at 11 in which the valve referred to generally by the numeral 12 to which the present invention is directed is positioned normally immediately above the drilling bit in a drill string. The drill collar or portion of drill string 11 is provided with an annular shoulder 13 and also, of course, is provided with threaded end portions (not shown) whereby the portion of the drill collar or drill string 11 may be connected into the drill string.

Also not shown is the upper end of the drill string to which the member 11 is connected, such end (not shown) forming an upper stop for the valve 12 and the shoulder 13 forming a lower stop for the valve 12.

The valve 12 includes a valve body or cage 15 which includes an upper cylindrical portion 16 and a lower cylindrical portion 17 interconnected by circumferentially spaced ribs 18.

The upper cylindrical portion 16 is provided with a pair of oppositely directed seals 19 and 20 which may be of any suitable packing such as cup-shaped packing. It will be noted that the packing 19 and 20 is provided with a portion 19' and 20, respectively, which fits within annular grooves 21 and 22, respectively, formed on the outer periphery of the upper cylindrical portion 16 of the valve body 15, and each seal 19 and 20 also includes a lip portion 19a and 20a which extends circumferentially for engaging with the cylindrical wall of the bore 11a of the drill string portion 11 in which the valve 12 is positioned as better shown in FIG. 1 of the drawings. The upper seal :ring 19a seals off so as to preclude downward flow of fluid between the valve body 15 and the drill pipe portion 11, and the lower packing member 20 precludes upward flow of fluid between the valve body 15 and the tubular section 11.

The enlarged bore 25 of the valve is provided with a tapered annular shoulder 26 at its lower end against which the tapered surface 27 of the valve stop or valve head 28 is adapted to engage as illustrated in FIG. 1 to serve as a partial seal. Depending downwardly from the valve stop 28 is a valve stem 29 which may be secured to the valve head or stop 28 by any suitable means.

It will be noted that the valve stem 29 extends through a cylindrical opening 30 formed in the resilient sealing element 31 formed of rubber or other similar material which element 31 is adapted to engage the tapering counterbore 32 when the valve is in closed position as illustrated in FIG. 1 to sealing off fluid flow through the drill pipe. The stem 29 extends downwardly from the head or stop 28 and is freely slidable through the guide means referred to generally by the numeral 33.

The guide means 33 includes a central hub 34 better shown in FIG. 3 which is secured to the valve body 15 adjacent the lower cylindrical portion 17 by suitable means such as the radially extending ribs 35. Fitting within the central hub 34 is a sleeve 36 having a flange 37 at its upper end. The sleeve 36 is held against rotation relative to the inner hub 34 by any suitable means such as that illustrated in FIG. 3 wherein a screw 48 is threadedly engaged through the hub to abut the inner periphery of the sleeve and lock it against rotation.

Secured in the lower end of the stem 29 are suitable means represented generally by the numeral 39 to enable the stem to be moved longitudinally of the valve body 15 and rotated relative to the sleeve 36 for a purpose as will be described in greater detail hereinafter.

Spring means 40 are provided which abut the guide means 33 at its lower end and specifically rest upon the flange 37 as shown in the drawings and engages the valve means 6 at its upper end so as to tend to urge the valve means 6 towards the seated position as illustrated in FIG. 1 of the drawings. More specifically, the upper end 42 of the spring 40 engages the nether side of the seating element 31 which is retained in position by means of the retainer collar 43 which also serves to retain the spring 40 in position about the stem 29 as shown to inhibit lateral movement thereof relative to the sealing element and the valve means.

A projection 45 is provided on the stem 29, and the sleeve 36 is provided with an upwardly extending slot 36b in which projection 45 may move so that when the means 39 is grasped manually and the valve stem 6 moved downwardly against the force of the spring and rotated, the pin 45 engages within the upwardly inclined slot 36b in sleeve 36 as shown in FIG. 2 to cock or hold the valve means 6 in spaced relation relative to the valve seat so that the valve is open for fluid flow therethrough.

The inner hub 34 is provided with a longitudinally extending slot 34a which is generally aligned with the longitudinally extending slot 36a formed in sleeve 36.

The slot 34a formed in the inner hub is of a larger width than the stem 29 to enable the stem to be fitted therein and the valve 12 assembled. However, the slot 36a is smaller in width than the diameter of the stem 29 to retain the stem in substantially close slidable engagement within the guide means and specifically with the inner bore of the sleeve 36.

The means 39 may be of any suitable form and as illustrated is shown as including a threaded member 39a that is threadedly engaged in the lower end of the stem and is provided with a nut 39b to lock such member in posi tion. Radially extending portions 39c are provided at the lower end of the means 39 so that the means 39 may be readily grasped manually to pull the stem downwardly against the force of the spring 40 and rotate the projection 45 from longitudinal slot 36a into the slot 36b to hold the valve means 6 in open position. The radially extending portions 390 of the means 39 is of shorter extent than the internal diameter of the lower cylindrical portion 17 so as to not interfere with upward movement of the valve when it moves to closed position.

To disassemble the invention illustrated, the means 39 is threadedly disengaged from the lower end of the stem 29 and the sleeve 36 moved upwardly against the force of the spring until the lower end thereof has cleared the upper end of the hub 34 whereupon the stem 29 may be moved radially through the slot 34a and thereafter the sleeve 36 may be removed as well as the spring 40 and the retainer 43 for replacement of the seal means 31 if such becomes necessary.

In the use of the present invention, it is desirable in lowering drill string into the well bore, particularly in offshore drilling operations, that such lowering be accomplished with a minimum loss of time to avoid possible sticking of the drill pipe and to reduce drilling costs. To accomplish this, the valve 12 after assembly is then manually cocked to lock it in open position as shown in FIG. 2 by grasping the means 39 and pulling the stem 29 downwardly against the force of the spring and rotating it so that the projection 45 engages within the tapering slot 36b. This serves to hold or lock the valve means 6 in spaced relation to the valve seats. The valve 12 is then positioned within the portion 11 of the drill string and seated on the shoulder 13 and the portion 11 of the drill string then connected preferably immediately above the drill bit.

Additional joints of drill collars and drill pipe are then added to the drill string a joint at a time, and it can be appreciated that since the valve is in open position fluid flow may occur upwardly through the lower cylindrical portion 17 around the ribs 35 and through the valve body 15 and open valve and outwardly through the upper cylindrical portion 16 into the next adjacent joint so that fluid communication within the bore of the drill string is not restricted, thus permitting the joints of pipe to be rapidly connected into the drill string as the drill pipe is progressively lowered into the well bore as each joint is added thereto.

When the drill string reaches the bottom of the Well bore, pump pressure at the earths surface may be increased whereupon such pump pressure will act upon the stop 28 to tend to move it downwardly, and when this occurs, the projection 45 is urged out of the tapering slot 36b and into the longitudinally extending slot 36a formed in sleeve 36. Should pressure beneath the valve means increase above the weight of the column of drilling fluid in the drill string above the valve stop 28, the valve means will be urged upwardly into seating position as shown in FIG. 1, thereby inhibiting blowouts or fluid flow upwardly through the internal bore of the drill string.

From the foregoing description, it can be appreciated that the present invention provides a means whereby a drill pipe valve commonly referred to as a drill pipe float valve may be initially cocked in open position so that the drill string automatically fills as it is lowered into the well bore and after the drill pipe has been set on bottom within the well bore and pump pressure increased, the projection 45 moves out of the slot 36b and the valve is in operative position and ready to close upon any increase in pressure within the drill string below the valve 12.

Broadly, the present invention relates to a drill pipe valve commonly referred to as a drill pipe float valve whereby it may be initially locked in open position and thereafter automatically unlocked by an increase in pump pressure at the earths surface.

What is claimed is:

1. In a drill pipe valve:

(a) a valve body;

(b) a valve seat in said valve body;

(c) valve means for engaging said seat;

(d) a valve stem extending from said valve means within said body;

(e) guide means carried by said valve body and including a central structure spaced below said valve means, said valve stem being slidably received through said central structure;

(f) spring means engaging said central structure and said valve means to urge the latter into engagement with said seat;

(g) co-operating means on said valve stem and central structure for holding said valve means off said seat, said co-operating means including a projection on said stem and a longitudinal slot and an adjoining upwardly inclined slot in said central structure for receiving said projection;

(h) means on the lower end of said stem for manually pulling said stem downwardly against the force of said spring and for rotating said stem to engage said projection within said slot to hold said valve means spaced from said valve seat; and

(i) said valve means being movable downwardly by an increase in upstream pressure to remove said projection from said inclined slot into said longitudinal slot to permit the valve means to close upon back flow.

2. The drill pipe valve of claim 1 wherein said central structure comprises a hub with a sleeve in such hub, said sleeve having a flange engaging the upper end of said hub, said valve stem being slidably received through said sleeve, and said spring means engaging said flange on said sleeve and said valve means, and wherein said longitudinal slot and said upwardly inclined slot are located in said sleeve.

3. The drill pipe valve of claim 2 which also includes means for holding said sleeve against rotation relative to said hub.

References Cited UNITED STATES PATENTS 2,771,091 11/1956 Baker 137454.2 XR

2,802,482 8/1957 Arnhold 137315 2,804,281 8/1957 Osburn 137-454.2 XR

2,884,002 4/1959 Melton 137-4542 HAROLD W. WEAKLEY, Primary Examiner.

US. Cl. X.R.

US60493466 1966-12-27 1966-12-27 Drill pipe valve having means for rendering it temporarily inoperative Expired - Lifetime US3419040A (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3734456A (en) * 1972-06-09 1973-05-22 Pan American Enterprises Valve with axial screw assembly
EP0116443A1 (en) * 1983-02-04 1984-08-22 I.I.E. Innovation Enterprise Ltd. Down hole blow out preventer and method of use
US4580596A (en) * 1983-01-18 1986-04-08 Stehling Henry J Check valve with dual locking mechanism
WO1987003037A1 (en) * 1985-11-08 1987-05-21 Weatherford U.S. Inc. Valve for use in well bores
US4712619A (en) * 1986-07-30 1987-12-15 Halliburton Company Poppet valve
EP0533369A1 (en) * 1991-09-16 1993-03-24 Halliburton Company Temporarily held open casing filling valve
US5398744A (en) * 1992-06-17 1995-03-21 Street; Brian R. Tire pressure regulating apparatus
US6050295A (en) * 1998-06-04 2000-04-18 Fastest, Inc. High flow valved fitting
US20020096209A1 (en) * 2000-11-08 2002-07-25 Fastest, Inc. Rapid evacuation and charging system, and apparatus and methods relating thereto
GB2372798A (en) * 2001-01-11 2002-09-04 Gantry Licencing Ltd Apparatus for checking and or adjusting fluid pressure of a tyre
GB2384542A (en) * 2001-12-26 2003-07-30 Visteon Global Tech Inc Charge valve for an air conditioning system
US6659426B2 (en) 2001-12-26 2003-12-09 Visteon Global Technologies, Inc. Charge valve in a high pressure air conditioning system
US20110192608A1 (en) * 2009-05-22 2011-08-11 Lejeune Robert J Self centering downhole float valve for vertical and lateral wells
US20120048395A1 (en) * 2009-05-12 2012-03-01 Werner Herrfurth Device for inserting a shut-off device in a pipeline
US20160312576A1 (en) * 2014-01-15 2016-10-27 Halliburton Energy Services, Inc. Method and apparatus for retaining weighted fluid in a tubular section
US20170107774A1 (en) * 2014-03-26 2017-04-20 Drillmec Spa Method of assembly of a string of elements for deepwater drilling and ultradeep obstruction element and corresponding use of the same in said drilling string

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771091A (en) * 1954-02-23 1956-11-20 Baker Oil Tools Inc Drill pipe float valve
US2802482A (en) * 1954-11-05 1957-08-13 John J Arnhold Piston float valve
US2804281A (en) * 1954-02-02 1957-08-27 Henry G Osburn Float valve
US2884002A (en) * 1957-10-14 1959-04-28 Geolograph Co Drill pipe valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2804281A (en) * 1954-02-02 1957-08-27 Henry G Osburn Float valve
US2771091A (en) * 1954-02-23 1956-11-20 Baker Oil Tools Inc Drill pipe float valve
US2802482A (en) * 1954-11-05 1957-08-13 John J Arnhold Piston float valve
US2884002A (en) * 1957-10-14 1959-04-28 Geolograph Co Drill pipe valve

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3734456A (en) * 1972-06-09 1973-05-22 Pan American Enterprises Valve with axial screw assembly
US4580596A (en) * 1983-01-18 1986-04-08 Stehling Henry J Check valve with dual locking mechanism
EP0116443A1 (en) * 1983-02-04 1984-08-22 I.I.E. Innovation Enterprise Ltd. Down hole blow out preventer and method of use
WO1987003037A1 (en) * 1985-11-08 1987-05-21 Weatherford U.S. Inc. Valve for use in well bores
US4712619A (en) * 1986-07-30 1987-12-15 Halliburton Company Poppet valve
EP0533369A1 (en) * 1991-09-16 1993-03-24 Halliburton Company Temporarily held open casing filling valve
US5398744A (en) * 1992-06-17 1995-03-21 Street; Brian R. Tire pressure regulating apparatus
US6050295A (en) * 1998-06-04 2000-04-18 Fastest, Inc. High flow valved fitting
US20020096209A1 (en) * 2000-11-08 2002-07-25 Fastest, Inc. Rapid evacuation and charging system, and apparatus and methods relating thereto
US6901947B2 (en) 2000-11-08 2005-06-07 Fastest Inc. Rapid evacuation and charging system, and apparatus and methods relating thereto
USRE47322E1 (en) 2000-11-08 2019-03-26 Fastest, Inc. Rapid evacuation and charging system, and apparatus and methods relating thereto
GB2372798A (en) * 2001-01-11 2002-09-04 Gantry Licencing Ltd Apparatus for checking and or adjusting fluid pressure of a tyre
US6659426B2 (en) 2001-12-26 2003-12-09 Visteon Global Technologies, Inc. Charge valve in a high pressure air conditioning system
GB2384542A (en) * 2001-12-26 2003-07-30 Visteon Global Tech Inc Charge valve for an air conditioning system
GB2384542B (en) * 2001-12-26 2004-10-13 Visteon Global Tech Inc Charge valve for an air conditioning system
US6719003B2 (en) 2001-12-26 2004-04-13 Visteon Global Technologies, Inc. Charge valve for an air conditioning system
US20120048395A1 (en) * 2009-05-12 2012-03-01 Werner Herrfurth Device for inserting a shut-off device in a pipeline
US8662101B2 (en) * 2009-05-12 2014-03-04 Mertik Maxitrol Gmbh & Co. Kg Device for inserting a shut-off device in a pipeline
US8757268B2 (en) * 2009-05-22 2014-06-24 Bl Sales & Management, Inc. Self centering downhole float valve for vertical and lateral wells
US20110192608A1 (en) * 2009-05-22 2011-08-11 Lejeune Robert J Self centering downhole float valve for vertical and lateral wells
US20160312576A1 (en) * 2014-01-15 2016-10-27 Halliburton Energy Services, Inc. Method and apparatus for retaining weighted fluid in a tubular section
US9835008B2 (en) * 2014-01-15 2017-12-05 Halliburton Energy Services, Inc. Method and apparatus for retaining weighted fluid in a tubular section
US20170107774A1 (en) * 2014-03-26 2017-04-20 Drillmec Spa Method of assembly of a string of elements for deepwater drilling and ultradeep obstruction element and corresponding use of the same in said drilling string
US10113379B2 (en) * 2014-03-26 2018-10-30 Drillmec S.P.A. Method of assembly of a string of elements for deepwater drilling and ultradeep obstruction element and corresponding use of the same in said drilling string

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