US2222750A

US2222750A - Tester and packer

Info

Publication number: US2222750A
Application number: US287417A
Authority: US
Inventors: Litolff Osmond Joseph
Original assignee: OIL WELL TOOLS Inc
Current assignee: OIL WELL TOOLS Inc
Priority date: 1939-07-29
Filing date: 1939-07-29
Publication date: 1940-11-26
Anticipated expiration: 1957-11-26

Description

I. 141 HHHHHH J.

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J. LITOLFF STER AND PACKER Filed July 29, 1939 Patented Nov. 26, 1940 PATENT OFFICE ras'raa AND PACKER Osmond Joseph Litolfl, Metairie, La., assignor to Oil Well Tools, Inc., New Orleans, La., a corporation of Louisiana Application July 29, 1939, Serial No. 287,417

7 Claims.

The present invention relates to improvements in testers or samplers for casings, formations and the like, and to packers for such testers and for other purposes.

An important object of this invention is the provision of a deviceoi simple construction which may be readily operated to make tests of casings and formations.

A further object of the invention is the provision of a testing device of this character with v packing means associated therewith.

Other objects and'advanta'ges of the invention will be apparent during the course of the following description.

In the drawing, which forms a part of this specification and wherein like characters of reference denote like parts throughout,

Figure 1 is a longitudinal sectional view through a device embodying this invention,

Figure 2'is a similar view showing the device in testing position with the packer expanded, and showing the plunger mechanism in section, Figure 3 is an enlarged detail sectional view through the testing valve and valve operating mechanism, and,

- end but spaced therefrom. A central opening l5 Figure '4 is a transverse section on line 6-4 of Figure 2.

In the drawing, wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral Ill designates the elongated cylinder of the tool, provided at its upper end with packing ll held in place and expanded by means of a cap l2 screw threadedly attached to the upper end of the cylinder. The lower end of cylinder in is provided with a reduced tubular extension l3 having a wall I adjacent its lower in the wall l4 receives a valve operating rod to be hereinafter described. The lower end of cylinder extension I3 is internally and externally screwthreaded.

A packer sleeve I6 is disposed about the cylinder extension l3 having a threaded connection to the lower end thereof and abuts against the bottom of cylinder l0. An expansible packing element ll, of rubber or other suitable material is connected to the removable sleeve H5 at the upper and lower ends thereof. A series of openlugs 18 in extension l3 and sleeve l6 connect the interior of sleeve l6 with the interior of packing element IT.

A valve casing is has a reduced threaded boss 20 disposed centrally of its upper end and adapted to be received in the lower end of extension l3. Suitable packing material 2| is disposed in the lower end of extension l3 between wall I4 and boss 20, and a central opening in boss 20 corresponds with opening I5 in wall M. A transverse wall 22, of substantial thickness, is disposed substantially midway of the valve casing l3 and is provided with a central valve seat 23 in its lower side. Valve seat 23 is preferably cylindrical at its lower end and its walls converge upwardly to a point adjacent the top of wall 22. An opening 24 extends from the top of the wall 22 into valve seat 23, its walls tapering downwardly to the top of the valve seat.

A threaded disk 25 is removably threaded to the lower inner portion of the valve casing l9 and is spaced a substantial distance below wall 22. Suitable openings 26 in disk 25 permit the passage of fluid therethrough while a central opening slidably receives a valve stem 21 having a valve head 26 with upwardly converging walls adapted to seat in valve seat 23 and seal the upper chamber of valve casing l9 from the lower chamber thereof. A coil spring 29 surrounds -valve stem 21, engaging the top of disk 25 and pressing against a washer 30 held in Place on stem 27 by means of a pin 3| carried by the valve stem. A flange 32, which may be removable, is

secured to the lower end of stem 21. It will be seen that spring 23 normally presses valve head 28 upwardly into the valve seat 23.

An elongated, perforated tube or screen 33 is closed at its lower end by a removable cap 34 and has a diameter substantially less than valve casing 19., A tapered connection 35 is threaded to the lower end of easing l3 and to the upper end of screen 33, serving to connect the perforated screen 32 through openings 26 in disk 25 to the lower chamber of valve casing IS.

A pistonrod 36 is detachably connected at its upper end by threads or the like to the lower end of the drill stem, pipe or operating member 31, and is provided at its lower end with a piston 36 snugly fitting the inner walls of cylinder I II. A central bore 39 extends completely through the rod 36 and piston 38 and is internally threaded at its-lower end to adiustably receive the threaded upper end of a valve operating rod'or plunger 43. Plunger 40 has its lower end provided with a substantially conical tip 4| adapted to extend through opening 24 and into valve seat 23 to unseat valve head 23. A small bore 42 extends from the top of plunger 43 to the tip thereof,

branching at its lower end to the tapered sides a extension l3 in spaced relatio of the plunger tip immediately adjacent the lower end or point thereof. When the plunger tip 4| is seated in opening 24, the bore outlets 43 are disposed in' the valve 'seat23, as seen in Figure 3, to form communication between the lower valve chamber and the drill pipe 31 through bores 42 and 33. l

Plunger. extends from cylinders l0, through to the walls thereof, through opening I! inw l I 4, packing 2i and boss 20 into the upper valvechamber. A suitable fluid 44 is arranged in cylinder l3, below the piston, in extension 13 and packing element Ill.

When asample is to be taken, the tool is lowered into the well, hole or casing by means of pipes 31, the valve 23 being closed and plunger 40 being disposed out of contact with the valve. When the bottom of screen tube 33 contacts the bottom of the well, downward movement ofscreen 33, .casing i3 and cylinder i3 is stopped. but piston 38 andplunger 43 continue to move downwardly. The movement of piston 33 relative to cylinderll'i forces fluid 34 out through openings l8 into packing element l1, expanding packing element i1 against the walls of-the casing or well and preventing passage of fluid past the packing element l1. Further downward movement of piston 33 forces plunger tip 4| into opening 24, thereby unseating valve head 23, as seen in Figures 2 and 3, and permitting fluid in the well or casing to pass from screen 33 and the lower valve chamber up through bore'42 oi the plunger to bore 33 of the piston and then into the pipe 31. When the-pipe 31 is raised, valve 23 first closes preventing escape oi fluid from pipe 31, and further upward movement releases pressure in packer l1, permitting the tool to be raised with the pipe 31 and fluid sample. The amount packer I1 is expanded before valve 23 is unseated may .be regulated by adjusting the threaded connection between plunger 40 and piston 33.

It will be seen that the action of the packing element l1 and valve 23 is entirely automatic. The. packer l1 must expand and close'the well or casing before valve 23 is opened, and spring 23 Y to without departing from the spirit of the invention or the scope of the subloined claims.

Having thus described my invention what I claim anddesire to protect by Letters Patent is:

1. In a sampling device, a tool body, an ex.

pansible packing element carried by said tool body, there being asampling chamber in said tool body, a valve normally closing saidv cham- .said valve.

ber, and a plunger mechanism associated with said tool body and having a stroke which first expands said packing element and then opens 2. In a sampling device, a pansible hydraulic packing element carried by said tool body, there being a sampling chamber in said tool body, a valve-normally closing said chamber, and a plunger mechanism movable longitudinally of said tool body to expand said pack- 10 mg element and then open said valve.

3. In a sampling device a hydraulic cylinder.

an expansible hydraulic packing element assopacking element, and whereby further movement of said plunger will force the valve operating .member into engagement with the valve to un- 25 seat the valve. I v

4. Ina samplingdcvice, a hydraulic cylinder, an expansible hydraulic'packing elementassociated with said cylinder, a sampling valve casing carried by said cylinder, a valve in said 30 casingwhich is normally seated, a plunger mechanism slidably disposed in said cylinder and having a valve operating member extending into said valve casing in llnewith and spaced from said valve, whereby movement of said plunger mechanism willforce fluid under pressure from said cylinder into said packing element to expand the packing element, and whereby further movement of said plunger will force the valve operating member into engagement with the valve to 40 unseat the valve, and. means to vary the effective length of the valve operating member.

' 5. In a sampling device, a tool body having a valve casing therein, said casing having openings to admit fluid, a valve seat in said casing, a valve 45 normally disposed in said valve seat, a sampling tube, a plunger mechanism connected to said sampling tube and extending through said toolbody and into said valve casing in line with the valve seat, said plunger mechanism having a 0 .bore connecting the tube with the end of the plunger in the valve casing, whereby movement of the plunger -mechanism through said tool body will force the plunger endginto the valve seat to unseat the valve and'place the sampling 55 tube in communication with the fluid in the valve casing, an expansible packing element carried by said tool body, and means operated by the initial movement of the plunger mechanism to expandthe packing element before unseating 00 the valve.

6. In a sampling device, a hydraulic cylinder, an Yexpansible hydraulic packing element carried by said cylinder and communicating therewith, a valve casing associated with said cylln- 05 der and having a valve seat therein, aspring pressed valve normally disposed in said valve seat, the portion of the valve casing, below the valve-being in communication with the fluid to be sampled. a tube, a piston connected to said 70 tube and slldably arranged in the cylinder, and a valve operating plunger carried bythe piston in line with the valve seat and normally spaced therefrom, there being a bore connecting the end of the plunger through the plunger and piston 75 tool body, an ex- 5' with the tube, whereby movement of the piston and plunger towards the valve seat will force fluid under pressure into said packing element and then force the end 01' the plunger into the valve seat to unseat the valve and permit the fluid to be sampled to pass through the plunger and piston into the tube.

7. In a sampling device, a hydraulic cylinder, an expansible hydraulic packing element carried by said cylinder and communicating therewith, a valve casing associated with said cylinder and having a valve seat therein, a spring pressed valve normally disposed in said valve seat, the portion of the valve casing below the I valve being in communication with the fluid to be sampled, a tube, a piston connected to said tube and slidably arranged in the cylinder, a valve operating plunger carried by the piston in line with the valve seat and normally spaced therefrom, there being a bore connecting the end of the plunger through the plunger and piston with the tube, whereby movement of the piston and plunger towards the valve seat will force fluid under pressure into said packing element and then force the end of the plunger into the valve seat to unseat the valve and permit the fluid to be sampled to pass through the plunger and piston into the tube, and means to vary the efiective length of the plunger to control the amount the packing element is expanded before the valve is opened.

OSMOND JOSEPH LITOLFF.