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

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 5b 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 .Dd 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 theline 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 thenumeral 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 thenumeral 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 anannular 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 thevalve 12 and theshoulder 13 forming a lower stop for thevalve 12.

Thevalve 12 includes a valve body orcage 15 which includes an uppercylindrical portion 16 and a lowercylindrical portion 17 interconnected by circumferentially spacedribs 18.

The uppercylindrical portion 16 is provided with a pair of oppositely directedseals 19 and 20 which may be of any suitable packing such as cup-shaped packing. It will be noted that thepacking 19 and 20 is provided with aportion 19' and 20, respectively, which fits withinannular grooves 21 and 22, respectively, formed on the outer periphery of the uppercylindrical portion 16 of thevalve body 15, and eachseal 19 and 20 also includes alip 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 thevalve 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 thevalve body 15 and the drill pipe portion 11, and thelower packing member 20 precludes upward flow of fluid between thevalve body 15 and the tubular section 11.

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

It will be noted that thevalve stem 29 extends through acylindrical opening 30 formed in theresilient sealing element 31 formed of rubber or other similar material whichelement 31 is adapted to engage the taperingcounterbore 32 when the valve is in closed position as illustrated in FIG. 1 to sealing off fluid flow through the drill pipe. Thestem 29 extends downwardly from the head or stop 28 and is freely slidable through the guide means referred to generally by thenumeral 33.

The guide means 33 includes acentral hub 34 better shown in FIG. 3 which is secured to thevalve body 15 adjacent the lowercylindrical portion 17 by suitable means such as the radially extendingribs 35. Fitting within thecentral hub 34 is asleeve 36 having aflange 37 at its upper end. Thesleeve 36 is held against rotation relative to theinner hub 34 by any suitable means such as that illustrated in FIG. 3 wherein ascrew 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 thestem 29 are suitable means represented generally by thenumeral 39 to enable the stem to be moved longitudinally of thevalve body 15 and rotated relative to thesleeve 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 theflange 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 thespring 40 engages the nether side of theseating element 31 which is retained in position by means of the retainer collar 43 which also serves to retain thespring 40 in position about thestem 29 as shown to inhibit lateral movement thereof relative to the sealing element and the valve means.

Aprojection 45 is provided on thestem 29, and thesleeve 36 is provided with an upwardly extendingslot 36b in whichprojection 45 may move so that when themeans 39 is grasped manually and thevalve stem 6 moved downwardly against the force of the spring and rotated, thepin 45 engages within the upwardlyinclined slot 36b insleeve 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.

Theinner hub 34 is provided with a longitudinally extendingslot 34a which is generally aligned with the longitudinally extending slot 36a formed insleeve 36.

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

Themeans 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 extendingportions 39c are provided at the lower end of themeans 39 so that themeans 39 may be readily grasped manually to pull the stem downwardly against the force of thespring 40 and rotate theprojection 45 from longitudinal slot 36a into theslot 36b to hold the valve means 6 in open position. The radially extending portions 390 of themeans 39 is of shorter extent than the internal diameter of the lowercylindrical portion 17 so as to not interfere with upward movement of the valve when it moves to closed position.

To disassemble the invention illustrated, themeans 39 is threadedly disengaged from the lower end of thestem 29 and thesleeve 36 moved upwardly against the force of the spring until the lower end thereof has cleared the upper end of thehub 34 whereupon thestem 29 may be moved radially through theslot 34a and thereafter thesleeve 36 may be removed as well as thespring 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, thevalve 12 after assembly is then manually cocked to lock it in open position as shown in FIG. 2 by grasping themeans 39 and pulling thestem 29 downwardly against the force of the spring and rotating it so that theprojection 45 engages within thetapering slot 36b. This serves to hold or lock the valve means 6 in spaced relation to the valve seats. Thevalve 12 is then positioned within the portion 11 of the drill string and seated on theshoulder 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 lowercylindrical portion 17 around theribs 35 and through thevalve body 15 and open valve and outwardly through the uppercylindrical 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 thestop 28 to tend to move it downwardly, and when this occurs, theprojection 45 is urged out of the taperingslot 36b and into the longitudinally extending slot 36a formed insleeve 36. Should pressure beneath the valve means increase above the weight of the column of drilling fluid in the drill string above thevalve 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, theprojection 45 moves out of theslot 36b and the valve is in operative position and ready to close upon any increase in pressure within the drill string below thevalve 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.

Images