US2676661A

US2676661A - Pressure releasing valve for test pipes

Info

Publication number: US2676661A
Application number: US204458A
Authority: US
Inventors: Jr Harry H Crooke
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-01-04
Filing date: 1951-01-04
Publication date: 1954-04-27
Anticipated expiration: 1971-04-27

Description

Patented Apr. 27, 1954 r,rnnssono;nonnfglginvwommscr- Hanan !n Grooke, J! Annlicationrlanuasyd, 1951;fScliElN0 2.045458 The present invention relates to improvements in pressure releasing valves vfor "test de isions is of the type. to be used to release thellowerfhole pressure of an oil Well .for testing pur oses. .aiter the casing packer has been set andrexpflnded.

,An object oirthe presentinventionisto nroride an improved releasing valve fortconnectiongwifh a 126st pipe whereby the ,pressuresof the 7 bottom hole .normally .urges the releasing Valve to closed position for preventing flow through the 151116 members to thesurfaceof the well.

. A ,further object of the present invention ,is {to provide a ,means for .unseating th ,-r eleas ,e .val,ve from engagement with the valve ,seat betweenothe pipe member and tubular .casing ,and wherein-la valve a e is disposed .below the release valveior receiving the valve upon unseating movement thereof.

it .further object of the present invention istito provide a piston valve reciproca'bly en a qdtin the lower pipe-member and tubular. casi g whereby the bottom hole pressure will be exerted against the piston valve for urging the same wardly and increasing the pressure in the chamber within thetubular casing.

'Still another objectof thepresentinventionds .to insert the metering disklihetween ithfispiston valveand the releasin valve whereby the movement of the piston valve will he .lliifiitedi'ihY thefrl w of'fiu d t u h t openingsJnthemeterin valve disk.

A still further object of the present-invention resides in the provision of a tubular element having a partition wall "formed at an "intermediate portion thereof for preventing communication therethrough and wherein thewa'llsvor the tubula-r element ,are formed'with opening ibothabove and below the partition wall, the loweropenings providing communication between "the bottom hole and the underside of' the pistonfor'normally urgingthe piston upwardly wherehy'theholes in :the upper walls of'thetubular element willflaesenuentially uncoveredin responseto upward move ment-ofthepiston valve.

"Various other objects and advantageswhi he come apparent from the detailed 'descriptioneto follow. The best form in which 'Irontemplated applying my"inventi0nis clearlyillustratedjin the accompanying drawings,- wherein Figure 1 is a vertical transverse sectionaliyiew taken substantially along the longitud nal. axis of thejtest. pipe;

,iEi ure 12 is.a viewsimilar .toiEigureiIbut wherein the .release valve has,..b,een-doW1Lwa-1ld}y ,nggegl in response to the means for unseating the releasesvwlveiand wherein the piston valve has been moved upwardly in response to pressure of the iiivottonrdro'le, thereby uncovering openings in the walls of the tubular element for providingflow .through-thetest pipe to the surface of the well; dfligure '3 is a horizontal transverse sectional gview taiken-;substantiaily along the plane of the "line3- 3offFigur-e'-1 figure 4 is a horizontal transverse sectional view taken-substantially along the 'plane of'iine 4-11 ofFi ure 1 and Figure75 is a horizontal detail sectional view ;pered ranflzexternally threaded, a tubular easing u ad iiaiIly'aligned With the first pipe 20 and *threadably secured thereto by a complementary h'walve threadedhorelfi. A second pipe'member'2'8 'ls ittireaglejdlyjinserted'into the lower internally -taered-gandithreadedbore '30 of the tubular casin; v4-

"'Smifirs pip member 20 is .formed With a first hone a second tapered bore in communination therewith .andv providing a valve seat 34,. page this threadably supported by the "lower-rend of-itho first pipe member .20 and has a plurality of apertures .38 formed therein toprohide roommunication between the tapered hore jgrmirigwthe r-yalve seat 34 of the first pipememyher L231 iand'vthe--ex.t ;i= rio1? of the valve cage .36. itrhepressureivalve means I4 is comprised-of a member Azyhaving an vupper tapered seating portion '44 and a lower tapered nose portion '45. flhesllpperitaperedportion A4 is grooved at do; rreeeivinea sealing ring 50 whereb when the praise M is it upp rmost p iti n, th rsealin no =50 "will .be en aged against the valve mnsealin pur oses.

lmih eiupper-lendiof the valve member 42 is-a reduced axially extending portion 52 which is disposegi-iinrthehore 32 when the valve is in its u 1 i ezzmosti osition.

means .Ior unseatingithe valve member A2 xzistm llpnised nfgthe elongated rod 54'havingspring guides 56 peripherally secured thereto for en d gagement with the walls of the bore 32 for longitudinal guiding movement. The lower end of the rod 54 is engageable with the reduced axially extending portion 52 of the valve member 42 whereby downward movement of the valve rod 54 will unseat the valve 42 from the valve seat 34.

The lower end of the tubular casing 24 is formed with a groove at 58 for seating the metering disk It therein, the upper end of the second pipe member 28 being in abutment therewith for fixedly supporting the metering disk Hi. The metering disk I6 is formed with at least one metering aperture 62 for restricting the flow there-- through. The metering disk 16 is also formed with an enlarged opening 64 with a sealing ring 66 seated within the inner periphery thereof. If desired, the cage 36 can be omitted and Having described the invention,

the metering disk l6 made integral with the casing 24.

The lower second pipe member 28 is formed with an enlarged bore 58 for reciprocably guid ing the piston valve means l8, anda secondreduced diameter bore 16 in communicationwith the bottom hole. v

The bore 10 is internally threaded atv 12 andja tubular element 14 has its lower end threadedly engaged therein. The tubular element '14 is formed with a longitudinally extending bore 16 with a partition wall 18 dividing the bore 16 into an upper portion 80 and a lower portion 82. The walls of the tubular element 14 are apertured below the partition wall 18 at 84 and above the partition wall at 86. The apertures 86 are upwardly staggered for a purpose to be hereinafter described. 1

The piston valve means l8 iscomprised of a piston disk portion 88 having a sealing ring seal 90 peripherally formed thereon for sealing engagement with the walls of the bore 68. The piston disk portion 88 has axially extending ther'e from the tubular portion 92 which is reeiprocably guided on the tubular element 14.

The upper end of the tubular portion 92 of the piston valve means It is. engaged in the opening 64 and is in sealing engagementwith the sealing ring 66 and a sealing ring 94 carried externally of said tubular element 14 in alignment with the metering disk l6.

In view of the foregoing description, taken in conjunction with the drawings, it is believed'that one skilled in the art will readily understand the manner in which the releasing valve and associated means operate. When it is desired to provide communication between the bottom hole and the bore 32 of the first pipe member 26, the rod 54 is downwardly urged for engagement against the upper end of the valve member 42. Of course, until the rod 54 is downwardly urged, the valve 42 is maintained in sealing engagement with the valve seat 34 by means of the pressure within the chamber H of the tubular casing 24, the pressure in the chamber H being maintained by the bottom hole pressure against the piston valve means l8.

As soon as the valve 42 has been unseated, it will be received in the casing 36 to prevent further downward movement thereof. Communication will thereby be afforded between the chamber II and the interior of the valve cage 36 and also through the valve seat or body to the bore 32 of the pipe member 20.

Upon release of the pressure within the chamber H, the valve piston means l8 will move upwardly in response to pressure from the bottom hole through the apertures 84. The flow of fluid from behind the piston disk 88 will be restricted through the aperture or apertures 62 in the metering disk It. As the piston valve means l8 moves upwardly, the openings 88 in the tubular element 14 will be sequentially in communication with the bottom hole, thereby providing communication between the bottom hole and the chamber I l and thence to the bore 32 of the pipe member 20. "Thus, the flow through the test pipe will be effectively controlled by the metering disk It and will gradually increase in response to upward movement of the piston valve means l8 and covering the op gs 6- what is claimed as new is:

1. A valve for pipe strings comprising a pipe member, a threaded projection on the lower end of said. pipe member, an internally threaded tubular casing threaded on said pipe member, the bores of the tubular casing and pipe member being in communication with each other, the bore in the lower end of the pipe member downwardly diverging to form a valve seat, a tapered valve normally located within said valve seat, said valve having a seal ring mounted in an annular groove, saidseal member providing a tight seal with the valve seat, means disposable within said pipe string for unseating said valve. 2. A valve for pipe strings comprising a pipe member, threaded projection on the lower end of said pipe member, an internally threaded tubular casing threaded on said pipe member, the bores of the tubular casing and pipe member being in communication with each other, the bore in the lower end of the pipe member downwardly diverging to form a valve seat, a tapered valve normally located within said valve seat, said valve having a' seal ring mounted in an annular groove, said seal member providing a tight seal with the valve seat, rneans disposable within said pipe string for unseating said valve, the lower end of the threaded projection extending into said casing, a valve cage threaded onto the lower end of said threaded projection and locking said casing to said pipe member, said valve being receivable within said cage upon unseating movement.

3. A valve for pipe strings comprising a first pipe member, a tubular casing secured to the lower end of said first pipe member, bores of the tubular casing and first pipe member being in communication with each other through an opening formed by a valve seat between the casing and first pipe member, a valve member engageable with said valve seat, means for unseating said valve member, a second pipe member secured to said tubular casing and communicating with the bore'thereof, and a piston member mounted in said second pipe member, the bore of said casing forming a fluid chamber, said piston member projecting into and being reciprocably positioned within said fluid chamber in sealed relation with a peripheral wall of said fluid chamber, said fluid chamber being communicated with the exterior of said second pipe member by a bore through said second pipe member and including an enlarged bore in said second pipe member, the pressure at the bottom of an oil well hole upwardly urging said piston member for increasing the pressure in said chamber, thereby normally urging said valve member into engagement with said seat when the casing and pipe members are lowered in the oil well hole, a tubular element having an intermediate portion thereof closed by a partition wall to prevent communication therethrough, said tubular element being fixedly secured to said sec- 0nd pipe member, said piston member being reciprocably received on said tubular element, a portion of said tubular element on one side of said partition wall having openings formed in the wall thereof to provide communication between the bores of said second pipe member and the underside of said piston valve means for urging the same upwardly, and a portion of said tubular element above said partition wall having staggered openings formed in the wall thereof sequentially uncovered by upward movement of said piston member.

References Cited in the file of this patent Number UNITED STATES PATENTS Name Date Otis May 30, 1933 Johnston Mar. 9, 1937 Dripps Apr. 4, 1939 ONeill et a1 June 4, 1940 Otis et a1 Sept. 4, 1945