Source: http://www.google.com/patents/US4944350?dq=6,757,710
Timestamp: 2014-09-20 12:56:45
Document Index: 387724105

Matched Legal Cases: ['art 6', 'art 1', 'art 6', 'art 6', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 6']

Patent US4944350 - Tool for closing a well tubing - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsThe invention relates to a tool having a valve (3c, 4c) for closing the tubing (100) of a well into which the tool has been placed. The valve member (4c) is controlled by means of a traction cable (17) via a hydraulic mechanism having two piston-and-cylinder assemblies (4b, 5e, 45; 1g, 4a, 41) which...http://www.google.com/patents/US4944350?utm_source=gb-gplus-sharePatent US4944350 - Tool for closing a well tubingAdvanced Patent SearchPublication numberUS4944350 APublication typeGrantApplication numberUS 07/147,077Publication dateJul 31, 1990Filing dateJan 20, 1988Priority dateOct 18, 1985Fee statusPaidAlso published asCA1271954A1, DE3671778D1, EP0225815A1, EP0225815B1, US4756372Publication number07147077, 147077, US 4944350 A, US 4944350A, US-A-4944350, US4944350 A, US4944350AInventorsPeter AireyOriginal AssigneeSchlumberger Technology CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (15), Referenced by (5), Classifications (16), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetTool for closing a well tubingUS 4944350 AAbstract The invention relates to a tool having a valve (3c, 4c) for closing the tubing (100) of a well into which the tool has been placed. The valve member (4c) is controlled by means of a traction cable (17) via a hydraulic mechanism having two piston-and-cylinder assemblies (4b, 5e, 45; 1g, 4a, 41) which reduce the force applied on the valve member (4c) by the pressure of the fluid in the well and which amplify the force (f) applied thereto by the cable (17) in order to open said valve member.
This is shown in greater detail in FIG. 8, where for the purpose of simplifying the drawing, the part 6 is assumed to be fixed and the pegs 16 of the part 1 are assumed to move. Supposing that the peg 16 starts from an initial position 161 and moves axially downwardly, it then encounters the projection 62 at 162, thereby being deflected to the right to 163, after which it continues axially to reach a position 164 from which it will subsequently rise to encounter the projection 63 at 165 and again be deflected to the right as far as 166 from which it moves axially to a final position 167 which is level with the starting position 161 but which is angularly displaced therefrom by a fraction of a turn. In reality, the peg 16 is fixed and it is the part 6 which turns through said fraction of a turn, and to the left. The part 6 can thus be used as an indexing member that counts the number of go-and-return strokes executed by the part 5 on which it is screwed.
If the cross-sectional areas of the portions 5e and 5c of the part 5 are respectively denoted S1 and S2 (see FIG. 7) then the effective piston area of the chamber 45 is S1 -S2. The fluid in the well is at a pressure P1 and exerts a force F1 =P1 S2 on the part 5 in an upward direction, while the fluid in the chamber 45 is at pressure P2 and exerts a force F2 =P2 S2 on the part 5 in a downward direction. Since the part 5 is in equilibrium between the well fluid at pressure Pl and the fluid above the valve element 4c whose pressure is negligible:
F1 =F2 and thus
P2 =P1 �S1 /S2.
Given that S1 is greater than S2, the pressure P2 in the two-part chamber 41, 45 is greater than the pressure P1 in the well.
Let the areas of the valve element 4c, the portion 5e of the part 5 and the piston 4a which are subjected to the pressure P1 be denoted respectively S3, S4, and S5. Let the area of the piston 4a which is subjected to the pressure in the fluid 41 be S6. It can then be seen that the valve element 4c is subjected to:
an upward force Fh from the pressure P1 of:
Fh =(S3 =S4 =S5)P1,
a downwards force Fb from the pressure P2, where ##EQU1## Suppose for the purposes of simplification that
S4 &lt;&lt;S5, S1 -S2 &lt;&lt;S6, and S6 &#8773;S5 &#8773;S3,
Fh =2S3 P1 Fb =S3 �(S1 /S2)�P1 whence
Fb =(S1 /2S2)�Fh.
Supposing the values of S1 and S2 are selected, for example, to be respectively equal to 2 cm2 and 1.5 cm2, it can be seen that the downward force Fb created by the hydraulic fluid in the chamber 41 is equal to two-thirds of the upward force Fh exerted by the well fluid, so that the resultant force Fh -Fb to which the valve member 4c is subjected in the closure direction is reduced to one-third of the force Fh to which it would be subjected if the two-piston hydraulic mechanism were absent.
&#916;P2 =F/(S1 -S2)
F=S6 �&#916;P2 =(S6 /(S1 -S2))f.
With the values given above by way of example for S1 and S2, and giving S3 the value of 15 cm2, it can be seen that the force-amplifying coefficient S6 /(S1 -S2) is 30. Consequently, by virtue of the hydraulic mechanism actuating the valve element 4c, the traction force f which needs to be applied to the cable 17 in the present practical example in order to operate the valve 4c is 30�3=90 times smaller than the force which would need to be applied directly to the valve if said hydraulic mechanism were absent.
When the cable 17 is again released, the valve 4c closes under the action of the spring 14 assisted by the pressure P1 of the fluid in the well, and the part 6 turns through another fraction of a turn.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS2033563 *Aug 25, 1934Mar 10, 1936Technicraft Engineering CorpMeans for controlling well flowUS2373648 *May 21, 1943Apr 17, 1945Martin Sida SRemotely controlled flow valve operating toolUS2962099 *Jan 20, 1956Nov 29, 1960Baker Oil Tools IncBlowout control valveUS3115188 *Nov 15, 1961Dec 24, 1963Cicero C BrownShifting tool for well apparatusUS3381753 *Sep 20, 1965May 7, 1968Otis Eng CoFluid flow control system for wellsUS3448803 *Feb 2, 1967Jun 10, 1969Otis Eng CorpMeans for operating a well having a plurality of flow conductors thereinUS3703104 *Dec 21, 1970Nov 21, 1972Tamplen Jack WPositioning apparatus employing driving and driven slots relative three body motionUS3735813 *Mar 12, 1971May 29, 1973Mack W TStorm chokeUS4059157 *Aug 23, 1976Nov 22, 1977Baker International CorporationWell control valve apparatusUS4252188 *Jul 23, 1979Feb 24, 1981Otis Engineering CorporationActuatorUS4399871 *Dec 16, 1981Aug 23, 1983Otis Engineering CorporationChemical injection valve with openable bypassUS4756372 *Sep 17, 1987Jul 12, 1988Schlumberger Technology CorporationTool for closing a well tubingFR2549133A1 * Title not availableGB955888A * Title not availableGB2102045A * Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS6158714 *Sep 14, 1998Dec 12, 2000Baker Hughes IncorporatedAdjustable orifice valveUS8443894 *Nov 18, 2009May 21, 2013Baker Hughes IncorporatedAnchor/shifting tool with sequential shift then release functionalityUS8607872 *May 30, 2013Dec 17, 2013Adrian BugariuFire prevention blow-out valveUS20110114325 *Nov 18, 2009May 19, 2011Baker Hughes IncorporatedAnchor/shifting tool with sequential shift then release functionalityUS20120048571 *Aug 25, 2011Mar 1, 2012Baker Hughes IncorporatedRemotely-Controlled Downhole Device and Method for Using Same* Cited by examinerClassifications U.S. Classification166/373, 166/332.1, 166/385, 166/325, 166/319International ClassificationF15B11/032, E21B34/14, E21B23/00Cooperative ClassificationE21B23/006, F15B2211/55, E21B34/14, F15B2211/50509, F15B11/0325European ClassificationE21B34/14, F15B11/032B, E21B23/00M2Legal EventsDateCodeEventDescriptionDec 21, 2001FPAYFee paymentYear of fee payment: 12Feb 13, 1998FPAYFee paymentYear of fee payment: 8Feb 13, 1998SULPSurcharge for late paymentFeb 12, 1994FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google