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Publication numberUS2535342 A
Publication typeGrant
Publication dateDec 26, 1950
Filing dateNov 3, 1944
Priority dateNov 3, 1944
Publication numberUS 2535342 A, US 2535342A, US-A-2535342, US2535342 A, US2535342A
InventorsAhlgren Erick L
Original AssigneeAhlgren Erick L
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Formation tester
US 2535342 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Dec. 26, 1950 E, AHLGREN l 2,535,342

FORMATION TESTER Filed NOV.l 3, 1944 Patented Dec. 26, 1950 UNI-TED STATES PATENT y OFFICE FORMATION TESTER Erick L. Ahlgren, Houston, Tex.

Application November 3, 1944, Serial No. 561,744

l (c1. 16e-12) 3 Claims.

This invention relates to a formation tester.

' An object of the invention is to provide a formation tester of the character described specially designed for use in connection with a gun unit so that the -gun unit and tester may be lowered into a well and the casing perforated so as to allow fluid from the surrounding formation to enter the casing and be collected by and entrapped in a chamber within the tester.

l Another object of the invention is to provide a formation tester of the character described embodying a novel type of valve assembly whereby the sample chamber in the operating string of pipe will be normally closed at its lower end, with means for equalizing the pressure above and beneath the valve of said assembly so as to facilitate the movement of the valve to closed position after a sample of the formation has been taken. Y

, The combined gun and tester are of such construction that the various formations at diierent elevations may be tested without removing ,the tool from the well.

With the above and other objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of Which is given in this specification and illustrated in the accompanying drawings, wherein:

` Figure l shows a vertical, sectional view of the combined gun and tester showing the packer collapsed and the sample chamber closed.

Figure 2 shows a vertical, sectional view showing the packer expanded and the sample chamber open to receive the sample.

Figure '5 shows a fragmentary, side elevation taken at right angles to the view shown'in Figure 1; and

Figure 4 shows a cross sectionalview taken on the'line 4 4 of Figure l.

Referring now more particularly to the drawings wherein like numerals of reference designate the same parts in each of the gures, the numeral I designates a tubular operating string of pipe which extends to the ground surface and 4 into which the upper end of the nipple 5 is r;

tted. This nipple has an external annular flange 6 and a clamp nut 1 is tted over the lower end of the nipple and screwed onto the lower end of the bar 3 and clamps the nipple in place. The nipple forms a connection for the well shooting gun 8 to the bar 3. This gun may be of any conventional construction having a plurality of radial bores as 9, only one being shown, wherein is located the projectile l0. Behind each projectile there is an explosive charge II through which the electrical conductor I2 extends, there being an electrical conductor for each projectile charge. These conductors extend upwardly within a groove I3 in the bar 3 and are connected at their upper ends to separate contact plates I4 located in the housing I5 into which the upper end of the bar is formed. These contact plates are insulated from said bar and from each other. The charges may be red by suitable mechanism that may be lowered through the operating string I such as disclosed in my copending application, SerialNo. 549,074 iled August 11, 1944, now Patent No. 2,396,768, granted March 19, 1946.

Around, and spaced outwardly from, the ba 3 there is a tubular packer supportv I6 providing a passage I6 through the packer and threaded onto the upper end of the tubular support'l there is the tubular packer expander I1 whose upper end is formed with an upwardly ared valve seat I8. Around the packer support there is a packer formed of rings I9 of resilient material which are arranged alternately with respect to metal rings 20 and this packer is embraced by the upper and lower end plates 2|, 22 which also surround the packer support I 6. The packer expander I1 abuts the upper plate 2l and beneath the lower plate there is a jaw expander 23 slidably connected with the packer support and onto the upper end of which is screwed a ange nut 2l which abuts the lower plate 22 and through which the packer support extends. The lower end of the packer support I6 has an outwardly turned flange 25 which is beneath and engages with the inwardly turned ange of the nut 24 so as to interlock the jaw expander 23 with the packer support I 6.

The expander 23 is hollow and is provided with the inlet ports 26 and its lower end has the downwardly tapering faces 21 on which the casing engaging jaws 28 are mounted to slide, said jaws having a dovetailed connection with their corresponding faces. The jaw expander 23 also has the ducts 29 leading from beneath the expander into the interior passage I6' thereof. The jaw expander 23 has an internal tubular skirt 33 which closely surrounds the bar 3 and whose upper end has an internal annular ange 3| which is engageable with an external upwardly facing shoulder 32 on said bar 3 so as to limit the downward movement of the expander 23 vrelativey to said bar. I

Surrounding the bar 3 beneath the jaw expander there is a tubular frame 33 having the upper and lower inside rings 34 and 35 secured means on the bar for supporting the jaw expander for limited downward movement relative to the bar, casing engaging jaws on and surrounding the bar, means frictionally engageable with a surrounding casing releasably connecting the jaws to the bar in retracted position, said jaws being engaged and expanded into engagement with the casing by said jaw expander upon release of said jaw connecting means and downward movement of the bar and jaw expander relative to the jaws, an annular packer assembly including an annular packer around the bar and supported by the jaw expander, an annular packer expander around the bar on the packer assembly and having an upwardly facing valve seat, said packer assembly and expander having a passageway therethrough with anopening in each expander through which uid may flow from beneath upwardly through them around the bar, a valve around, and slidable on, the bar above the packer expander, means on the bar for supporting the valve in a lower position on the bar spaced above the packer expander seat, said bar having a main duct with its lower end leading from an opening in the outside surface on the bar below said tubular means and upper end opening into said tubular means connected into said string,`the lower end of said main duct being closed by said valve when the valve is in said lower position and said bar having a bypass duct Awhose ends terminate above and beneath said valve, respectively, when the valve is in said lower position, yieldable means surrounding said bar and engaging and urging the valve downwardly on the bar, the valve being movable downwardly by said bar into contact with the valve seat on said packer expander, to close the opening in said packer expander and expand the packer assembly, said bar being movable further downwardly relative to said valve to carry the lower end or' the main duct beneath the valve and into communication with said passageway and to carry the upper end of the by-pass duct within Said valve "to close the upper end of said by-pass duct.

2. In a tester for wells, a bar, tubular means for connecting the upper end of the bar to a tubular operating string and communicating with said string, a tapered jaw expander around the bar and slidable relative thereto, means on the bar for supporting the jaw expander for limited downward movement relative to the bar, casing engaging jaws movably supported on said jaw expander, means irictionaily engageable with a surrounding casing reieasably connecting the jaws to the bar in retracted position, said jaws being engaged and expanded into engagement with the casing by said jaw expander upon downward movement or tne bar and jaw expander relative to tne jaws, an annular packer assembly including an annular pacser around tne bar and movaoly supported thereon, an annular paexer expander around tne bar on the packer assembly and having an upwardly facing valve seat, said pacxer assembly having a passageway therethrough through which lluld may Iiow from beneath upwardly around trie bar, a valve around, and slidable on, the par aoove the packer expander, llleans :or supporting the valve on tne bar in a position spaced aoove the pacxer expander and out or engagement with said valve seat, said bar having a duct with its lower end leading irom an opening in tne outside suriace oi' tile oar below said tubular means and wnose upper end opens into said tubular means, the lower end oi' said duct being closed by said valve when the valve is in said spaced position, yieldable means surrounding said bar and engaging and urging the valve downwardly on the bar, the valve being movable downwardly by said bar into contact with the valve seat on the packer expander to close the passageway in said packer and to expand the packer, said bar being movable further downwardly relative to said valve to carry the lower end of the duct beneath the valve and into communication with said passageway.

3. In a tester for wells, a tubular operating string adapted to be lowered into a well, a bar, tubular means for connecting the upper end of the bar to said string and communicating therewith, a packer assembly slidable o-n the bar and having a passageway therethrough through which iluid may flow from beneath upwardly around said bar, said packer assembly comprising a tubular packer around the bar, and upper tubular packer expander around the bar above the packer, and a lower tubular expander around the bar beneath the packer and engageable by said bar for movement therewith, said lower expander having downwardly tapering faces at its lower end, casing engaging jaws mounted on said lower expander for sliding movement relative to saidtaperingfaces,resilientmeansslidablycarried on said bar below said lower expander and frictionally engageable with said casing, link means operatively connecting said jaws and said resilient means, for moving said jaws outwardly along said tapering faces into engagement with a surrounding casing upon downward movement of said bar, releasable means connecting said resilient means with said bar for movement therewith to retain said jaws in retracted position, an upwardly facing valve seat on said upper packer expander, a valve around and slidable on the bar above the upper expander for movement into and out of engagement with said valve seat, means on the bar for supporting the valve out of engagement with said valve seat, said bar having a main duct with its lower end leading from an opening in the outside surface of the bar below said tubular means and whose upper end opens into said tubular means connected into said string, the lower end of said main duct being closed by said valve when said valve is supported by said supporting means out of engagement with said valve seat, and said bar having a by-pass duct whose ends terminate above and beneath said valve, respectively, when the valve is out of engagement with the valve seat, yieldable means surrounding said bar and engaging and urging the valve downwardly on the bar, the valve being movable downwardly by said bar and said bar being movable further downwardly relative to said valve after the valve engages said seat to carry the lower end of the main duct beneath the valve and into communication with said passageway and to carry the upper end of the by-pass duct within said valve to close the upper end of said by-pass duct.

` ERICK L. AHLGREN.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 2,029,491 Lane Feb. 4, 1936 2,330,509 McCullough Sept. 28, 1943

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2029491 *Aug 25, 1934Feb 4, 1936Technicraft Engineering CorpGun type formation tester
US2330509 *Apr 30, 1940Sep 28, 1943Mccullough Tool CompanyGun tester
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2947361 *Jul 25, 1958Aug 2, 1960Halliburton Oil Well CementingRetrievable tester for oil wells
US4626134 *Aug 26, 1985Dec 2, 1986Martin CoumontApparatus and method for extracting horizontal underground pipe
US5429192 *Mar 30, 1994Jul 4, 1995Schlumberger Technology CorporationMethod and apparatus for anchoring a perforating gun to a casing in a wellbore including a primary and a secondary anchor release mechanism
Classifications
U.S. Classification166/128, 166/145, 166/55.1, 166/130
International ClassificationE21B49/08, E21B49/00
Cooperative ClassificationE21B49/081
European ClassificationE21B49/08B