Gary Mack Lendermon

49845209, Jan 15, 1991

Apr 26, 1989

7/344489

Cliff L. Aseltine - Houston TX
Gary M. Lendermon - Missouri City TX

Schlumberger Technology Corporation - Houston TX

F42B 300

102313

In the preferred embodiment of the new and improved perforating apparantus that is described herein, a set of end closure members are cooperatively arranged to be inserted into the open ends of a length of typical piping and expanded radially outwardly into contact with the rough and irregular internal wall surface in each end of the pipe. Anchor members and sealing members are arranged on each and closure member for releasably securing and sealingly engaging these end closure members in the ends of the pipe when the end closure members are respectively expanded outwardly so that no machining operations are required to prepare the internal wall surfaces of the pipe before it can be employed as an expendable perforating carrier.

49601717, Oct 2, 1990

Aug 9, 1989

7/391807

Robert A. Parrott - Houston TX
Gary M. Lendermon - Missouri City TX

Schlumberger Technology Corporation - Houston TX

E21B 43116

166 55

Various charge phasing arrangements in a perforating gun include those uniquely associated with phasing solely along a 180 degree circumference of the perforating gun, for use in but not limited to deviated boreholes. One phasing arrangement comprises four rows of charges, four corresponding rows of recesses in the perforating gun carrier and four corresponding rows of holes in the loading tube, the recesses, holes and charges being constrained within a 180 degree circumference of the perforating gun. The two outermost rows have more recesses, more holes and more charges than do the two innermost rows, since more well fluid is interposed between the two outermost rows and the casing than is interposed between the two innermost rows and the casing of the borehole. Another phasing arrangement comprises five rows of charges, recesses and holes, in lieu of the four of the former embodiment, constrained within the 180 degree circumference, adjacent rows being disposed more closely together in this embodiment than in the former embodiment. A third phasing arrangement comprises eighteen rows of charges, recesses and holes disposed around the entire 360 degrees of the circumference of the gun and borehole.

56737602, Oct 7, 1997

Nov 9, 1995

8/556243

James Emmert Brooks - Manvel TX
Jack Fergurson Lands - West Columbia TX
Gary Mack Lendermon - Missouri City TX
Jorge Enrigue Lopez de Cardenas - Sugar Land TX
Robert Al Parrott - Houston TX

Schlumberger Technology Corporation - Houston TX

E21B 43117

175 46

A perforating gun includes a multiplicity of shaped charges, the multiplicity of shaped charges including a plurality of planes of charges, each plane of charges including a plurality (N) of shaped charges and a detonating cord running down through the axial center of each of the plurality of planes of charges. The plurality (N) of shaped charges are equally spaced at an angle 360/N about the detonating cord. The plurality of planes of charges: (1) are rotated at an angle of 180/N relative to one another, and (2) are axially packed together along the longitudinal axis of the gun so that the charges in one plane are nearly touching the charges in the adjacent plane, yet they all share the same centered detonating cord. The proximity of one plane to another is close enough such that one plane of charges detonates within a few microseconds of its neighboring plane of charges. The close packing of the shaped charges in the same plane and between adjacent planes: (1) prevent the charge cases from expanding significantly upon detonation, and (2) prevent the charge cases from breaking up into numerous small pieces (large chunks of charge case debris results).

47444240, May 17, 1988

Aug 21, 1986

6/898962

Gary M. Lendermon - Missouri City TX
Jack F. Lands - West Columbia TX

Schlumberger Well Services - Houston TX

E21B 43117

175 451

In the representative embodiment of the new and improved perforating apparatus described herein, shaped charge cases are provided with matching upper and lower supports with parallel abutment surfaces and alignment means cooperatively arranged to enable a plurality of these charge cases to be stacked together for erecting an intertwined assembly of cases. By appropriately selecting the combined heights of the matching supports, adjacent ones of the charge cases can be closely spaced one above the other and directed outwardly along selected radial perforating axes at uniform angular spacings.