Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate
2000-05-30
2004-05-04
Neuder, William (Department: 3672)
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
C175S298000
Reexamination Certificate
active
06729419
ABSTRACT:
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable.
TECHNICAL FIELD OF THE INVENTION
The present invention relates to drilling jars that are connected in-line in a drill string or work over string and that are used to deliver jarring impacts during drilling or work over operations such as fishing.
BACKGROUND OF THE INVENTION
Drilling jar's and in particular Houston Engineers' Hydra-Jar® tools are used to free stuck drill strings or to recover stuck drill string components during drilling or workover operations. The jar's provide an impact blow (hence the name jar) either in the up or down directions. The driller can control the jarring direction, impact intensity and jarring times from the rig floor. The magnitude and direction of the load used to initiate the impact blow (jar) achieve this control. Examples of hydraulic jars are disclosed in U.S. Pat. Nos. 5,431,221, 5,174,393, 5,595,244, 5,447,196, 5,503,228, 5,595,253 and such patents are incorporated herein by reference.
FIG. 1
shows a cross section through detent area
11
of prior art jar
10
. Upward force arrow
13
is shown applied to mandrel
12
of jar
10
. This force is transmitted to outer cylindrical housing
14
by a resulting increase in pressure in the hydraulic fluid that is contained in upper chamber
16
between outer cylindrical housing
14
and mandrel
12
.
The magnitude of the pressure in upper chamber
16
is directly proportional to the magnitude of the force applied to mandrel
12
. This high-pressure fluid is allowed to flow through orifice
18
to a lower chamber
20
. The result of this fluid flow is a relative axial movement between outer housing
14
and mandrel
12
. When this relative axial movement is sufficient to place orifice
18
in juxtaposition to relief area
17
of outer housing
14
a sudden release of high pressure fluid occurs which results in a impact blow being delivered to the “knocker” part of the jar (not shown). The “knocker” is usually located at the upper most end of the Drilling Jar.
SUMMARY OF THE INVENTION
The present invention provides a drilling jar comprising a mandrel with a shoulder extending radially outward that defines at least one openable and closeable orifice therethrough. An outer housing is slidably disposed about the mandrel to define an upper chamber above the shoulder and a lower chamber below the shoulder. A magnetorestriction material responds to a predetermined pressure in the upper chamber to open the at least one orifice in the shoulder to allow rapid pressure communication between the upper and lower chambers.
REFERENCES:
patent: 4140044 (1979-02-01), Biller et al.
patent: 4291773 (1981-09-01), Evans
patent: 5085400 (1992-02-01), Petersen
patent: 5330100 (1994-07-01), Malinowski
patent: 5372196 (1994-12-01), Andersson
patent: 5501425 (1996-03-01), Reinicke et al.
patent: 5877432 (1999-03-01), Hartman et al.
patent: 6263986 (2001-07-01), Massner et al.
Material “megamorphs” in magnetic field, Machine Design, Aug. 8, 1994 p. 18.
Leslie Langnau, Associate Editor, Actuator solutions to linear problems, Power Transmission The Magazine of Motion Systems Design, Jun. 1996, A Penton Publications, Cleveland, Ohio.
Steven Ashley, Associate Editor, Magnetostrictive actuators, Mechanical Engineering vol. 120/No. 6 Jun. 1998, p. 68.
Neuder William
Smith International Inc.
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