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US 4,232,752 AGranted
Method and apparatus for driving pipe
AssigneeService Equipment Design Co., Inc.
InventorsErnest D. Hauk, Jesse C. Kirkpatrick
Life of this patent
Estimating the term…
Abstract
A casing hammer for driving casing while drilling a water well comprises a housing having an annular pneumatic chamber with a relatively lightweight, short-stroke annular piston. The piston is reciprocably driven at a high rate to provide a large number of light blows of controllable energy upon an annular anvil that seals one end of the chamber. Percussive blows upon the anvil are transmitted through a drive head and adapter to the upper end of the pipe to be driven. The hammer is suspended from a rotary drive head that operates a hollow drill string extending downwardly through the hammer and through the casing driven thereby.
Claims29
A pipe hammer comprising
- an end cap,
- inner and outer concentric sleeves fixed to said end cap in radially spaced relation to each other to define an annular chamber closed at one end by said end cap,
- an annular piston slidably mounted in said chamber, an annular anvil slidably mounted in and sealing the other end of said chamber,
- means for radially positioning said sleeves relative to each other at said other end of the chamber to maintain concentricity of said sleeves, said means comprising a forward housing around said outer sleeve, and annular retainer within said inner sleeve, and means for connecting said housing and retainer to said end cap,
- means for reciprocating said piston within said chamber to cause the piston to repetitively strike said anvil, and
- means for receiving blows from said anvil and transmitting such blows to a pipe to be driven.
3 more elements
A pipe hammer comprising
- an end cap,
- inner and outer concentric sleeves fixed to said end cap is radially spaced relation to each other to define an annular chamber closed at one end by said end cap,
- an annular piston slidably mounted in said chamber, an annular anvil slidably mounted in and sealing the other end of said chamber,
- means for radially positioning said sleeves relative to each other at said other end of the chamber to maintain concentricity of said sleeves, means for reciprocating said piston within said chamber to cause the piston to repetitively strike said anvil,
- means for receiving blows from said anvil and transmitting such blows to a pipe to be driven, first and second tension means connected to said end cap and to said inner and outer sleeves, respectively, for fixing said sleeves to said end cap, said first tension means being positioned within said inner sleeve.
2 more elements
A pipe hammer comprising
- an end cap,
- inner and outer concentric sleeves fixed to said end cap in radially spaced relation to each other to define an annular chamber closed at one end by said end cap,
- an annular piston slidably mounted in said chamber, an annular anvil slidably mounted in and sealing the other end of said chamber,
- means for radially positioning said sleeves relative to each other at said other end of the chamber to maintain concentricity of said sleeves,
- means for reciprocating said piston within said chamber to cause the piston to repetitively strike said anvil,
- means for receiving blows from said anvil and transmitting such blows to a pipe to be driven, first and second tension means connected to said end cap and to said inner and outer sleeves, respectively, for fixing said sleeves to said end cap,
- said second tension means comprising a front housing abutting said outer sleeve at said other end of said chamber and means connected to said housing to hold it against said outer sleeve.
4 more elements
A pipe hammer comprising
- an end cap,
- inner and outer concentric sleeves fixed to said end cap in radially spaced relation to each other to define an annular chamber closed at one end by said end cap,
- an annular piston slidably mounted in said chamber, an annular anvil slidably mounted in and sealing the other end of said chamber,
- means for radially positioning said sleeves relative to each other at said other end of the chamber to maintain concentricity of said sleeves,
- means for reciprocating said piston within said chamber to cause the piston to repetitively strike said anvil,
- means for receiving blows from said anvil and transmitting such blows to a pipe to be driven,
- said means for receiving blows from said anvil comprising an annular drive head mounted for limited sliding motion to said outer sleeve and having one end positioned to receive impact blows from said anvil,
- an internal annular seal mounted to the interior of said drive head for sealing against the outer surface of a tube extending through said inner sleeve, through said anvil, through said drive head, and through a pipe to be driven, said drive head including a discharge aperture positioned on a side of said seal remote from said piston.
5 more elements
A pipe hammer comprising
- a housing having a bore including means defining an annular chamber circumscribing said bore,
- means on said housing for sealing one end of said chamber,
- an annular piston mounted for reciprocation in said chamber,
- an annular drive head slidably mounted at an end of said housing remote from said one chamber end, anvil means movably mounted to said housing between said piston and drive head for sealing the other end of said chamber,
- said anvil means comprising an annular anvil mounted for slidable motion relative to each of said housing, said piston and said drive head, whereby impact of said piston upon said anvil causes said anvil to impact said drive head,
- means responsive to said drive head for transmitting driving blows to a pipe, and means for reciprocating said piston within said chamber.
3 more elements
A pipe hammer for driving casing that has a drill string extending through the casing, said pipe hammer comprising
- a rear cap having a bore adapted to receive said drill string,
- an outer sleeve having a rear end seated on said rear cap coaxial with said bore, a front housing seated on the front end of said outer sleeve,
- tension means for securing said front housing to said rear cap to fix said outer sleeve to said rear cap,
- an inner sleeve having a rear end seated on said rear cap and positioned coaxially of said bore, an annular retainer seated on the front end of said inner sleeve,
- tension means for securing said retainer to said rear cap to fix said inner sleeve to said rear cap, said sleeves defining an annular chamber therebetween closed at the rear end of said sleeves by said rear cap,
- an annular anvil positioned between said sleeves at the front ends thereof in sealing relation to said chamber, said anvil having a limited slidable motion within said chamber,
- an annular piston slidably positioned within said chamber,
- valve means for introducing pressurized gas into said chamber alternately at opposite sides of said piston to reciprocate said piston within said chamber and cause it to repetitively strike said anvil, and
- means for transmitting blows from said anvil to casing to be driven by said hammer.
6 more elements
The method of employing a hollow pipe driving hammer for both driving and pulling pipe comprising
- positioning the hammer upon a pipe to be driven, operating the hammer to transmit downwardly directed blows to the pipe,
- turning the hammer upside down above the pipe,
- extending a tension member through the hammer, connecting a lower end of the tension member to the pipe, and
- operating the hammer to transmit upwardly directed blows to an upper portion of said tension member.
1 more element
The method of driving and at least partially pulling casing comprising
- positioning around the casing a cylinder having an annular chamber, an annular piston, and an annular anvil,
- positioning a drive member between the anvil and the casing to be driven,
- reciprocating the piston to cause it to impact the anvil and to cause the drive member to impact downwardly upon the casing and drive it into the ground,
- turning the cylinder, piston, anvil and drive member upside down,
- extending a tension member through the piston, anvil and drive member,
- connecting a lower end of the tension member to the casing, and
- reciprocating the piston to cause it to impact the anvil and to cause the drive member to impact upwardly upon an upper portion of the tension member, whereby the tension member will pull the casing upwardly.
4 more elements
Dependencies are inferred from the claim text.