John A Mccaskill

Address:

6635 Rutgers Ave, Houston, TX 77005

Phone:

(713)5925011

VIN:

1GNFC13097R211603

Make:

CHEVROLET

Model:

TAHOE

Year:

2007

US Patent:

6883614, Apr 26, 2005

Filed:

Apr 27, 2004

Appl. No.:

10/832778

Inventors:

David A. Schmidt - Houston TX, US
Thomas E. Neal - Hitchcock TX, US
John W. McCaskill - Jersey Village TX, US
Gary L. Horn - Cypress TX, US

Assignee:

Power Chokes - Cypress TX

International Classification:

E21B024/00

US Classification:

166373, 166316, 251214

Abstract:

The invention contemplates a simple coupling means for interfacing linear acting actuator shafts with valves or hydraulic chokes. The coupling means of the present invention allows either an actuator or an interconnected valve or choke to be rapidly, safely, and efficiently interchanged with a replacement part. The present invention is broadly applicable to a wide variety of actuator types having rectilinear motion outputs and to a large variety of valve and choke types which are operated by linear motions, including gate valves with or without balanced stems.

US Patent:

7124770, Oct 24, 2006

Filed:

Jan 20, 2004

Appl. No.:

10/760910

Inventors:

Robert F. Schmidt - Cypress TX, US
David A. Schmidt - Houston TX, US
John W. McCaskill - Jersey Village TX, US

Assignee:

Power Well Services, L.P. - Houston TX

International Classification:

F16K 17/14
F16K 17/40

US Classification:

137 6816, 137 71, 137797, 251 82, 251282

Abstract:

The present invention relates to a mechanism for preventing damage to the actuator of a hydraulic choke valve in the event of excessive backpressure on the outlet of the choke. The backpressure relief device is applicable to a choke valve which meters flow from a high pressure annular region around the axially reciprocable choke throttling member into a low pressure exit channel coaxial with the throttling member. In particular, a shearable means is used to connect the reciprocable control shank of the actuator to the throttling valve member of the choke valve. In the event of excessive pressure on the exit channel of the choke valve, the shearable means will shear, thereby fully opening the valve and permitting the excessive pressure to escape. The shearable means is readily replaced so that the valve easily can be put back into operating condition.

US Patent:

7159604, Jan 9, 2007

Filed:

Apr 27, 2004

Appl. No.:

10/832779

Inventors:

David A. Schmidt - Houston TX, US
Robert F. Schmidt - Cypress TX, US
John W. McCaskill - Jersey Village TX, US

Assignee:

Power Well Services, L.P. - Houston TX

International Classification:

F16K 3/02

US Classification:

137 1517, 13731527, 251293, 251318

Abstract:

The present invention relates to an apparatus for use in field servicing a choke valve system. The apparatus is used for lifting, manipulating, and handling the heavy components of hydraulic choke valves. The apparatus includes an elongated track, a choke valve support structure, a trolley that selectably reciprocates along a length of the trolley, and an attachment mechanism for attaching a choke actuator to the trolley.

US Patent:

7231932, Jun 19, 2007

Filed:

Nov 9, 2006

Appl. No.:

11/595608

Inventors:

Robert F. Schmidt - Cypress TX, US
David A. Schmidt - Houston TX, US
John Walton McCaskill - Jersey Village TX, US

Assignee:

Power Well Services, L.P. - Houston TX

International Classification:

F16K 3/02

US Classification:

137 1517, 13731527, 251293, 251318

Abstract:

An embodiment of the invention involves a method for servicing a choke valve that includes disconnecting a choke actuator and at least one internal valve component engaged therewith from the choke valve body of the choke valve and moving the same in a generally linear path away from the choke valve body along the axis of the choke valve body.

US Patent:

7275606, Oct 2, 2007

Filed:

May 4, 2007

Appl. No.:

11/799846

Inventors:

Donald Glynn Sims - Houston TX, US
Michael James Sims - Tomball TX, US
Robert Frank Schmidt - Cypress TX, US
David Anthony Schmidt - Houston TX, US
John Walton McCaskill - Jersey Village TX, US

Assignee:

Expro Americas, L.P. - Houston TX

International Classification:

E21B 21/10
F16K 11/085
B01D 35/02

US Classification:

175209, 175218, 175312, 166229, 166 7512, 137547, 13762532, 13762547, 210422, 210446, 210459

Abstract:

The invention contemplates a strainer based upon a four-way, two-position rotary cylindrical plug valve having a hollow plug. The normal entry port for the sealing plug of the plug valve is a circular radial hole passing from the exterior of the plug into the interior cavity of the plug. The normal exit port for the sealing plug is a regular array of small holes across from and coaxial with the normal entry hole. The ports for the valve body are in two pairs positioned at 90 from each other, with the axes of the ports lying in the same transverse plane as the ports of the valve plug.

US Patent:

7360611, Apr 22, 2008

Filed:

May 23, 2007

Appl. No.:

11/805328

Inventors:

Donald Glynn Sims - Houston TX, US
Michael James Taylor - Tomball TX, US
Robert Frank Schmidt - Cypress TX, US
David Anthony Schmidt - Houston TX, US
John Walton McCaskill - Jersey Village TX, US

Assignee:

Expro Americas, L.P. - Houston TX

International Classification:

E21B 21/06
E21B 21/10
B01D 35/02
F16K 11/085

US Classification:

175206, 175207, 175218, 166 7512, 166229, 137547, 13762532, 210422, 210309

Abstract:

A strainer system having two separate strainers positioned in parallel, where one strainer can be cleaned while still permitting normal flow through the other strainer. The system flow circuit is arranged so that a high pressure backwashing flow can be applied to one strainer while the other strainer is providing its normal straining function. The backwashed strainer is then isolated by valves so that its access flange can be removed and the particulate buildup within the valve plug cleaned out. The strainer is then returned to service following the replacement of the access flange. In this manner, it is possible to alternate between the two strainers so that continuous flow can be maintained to the hydraulic choke located downstream of the strainer system.

US Patent:

20040217050, Nov 4, 2004

Filed:

Feb 17, 2004

Appl. No.:

10/781186

Inventors:

David Schmidt - Houston TX, US
Thomas Neal - Hitchcock TX, US
John McCaskill - Jersey Village TX, US

Assignee:

Power Chokes, L.P. - Cypress TX

International Classification:

B01D017/038

US Classification:

210/512100, 166/075120, 210/109000

Abstract:

The invention contemplates a simple, easy to operate hydrocyclone separation system that removes the heavy phase containing the produced solids intermittently, rather than continuously. The desirable, lighter portion of the well production, from which the aggressive solids of the propant have been removed, is continuously separated from the well production and treated by the existing surface fluid conditioning equipment at the well site. The heavy phase is collected in the bottom of the hydrocyclone. The outlet for the heavy phase flow stream is normally closed by a shutoff valve and is only dumped when the separator is full. The solid containing fluid exiting from the heavy phase outlet valve is passed through a standard oilfield hydraulic choke in order to reduce its pressure sufficiently so that normal piping and solids collection equipment can be used to handle the dumped fluid.

US Patent:

20050092523, May 5, 2005

Filed:

Oct 27, 2004

Appl. No.:

10/974355

Inventors:

John McCaskill - Jersey Village TX, US
David Goodin - Cypress TX, US
Robert Goodwin - Houston TX, US

Assignee:

Power Chokes, L.P. - Cypress TX

International Classification:

E21B021/10
E21B021/08
E21B047/00

US Classification:

175038000, 175207000, 175218000

Abstract:

The present invention contemplates a choke control system that provides for local and off-site monitoring and control of the annulus flow pressure of a well. The choke control system includes a choke manifold connected to at least one choke and its associated actuator; a variety of instrumental drilling sensors, pump stroke counter switches, and choke position indicators; a local choke and hydraulic pressure control console; and a programmable controller in communication with the local choke and hydraulic pressure control console. The programmable controller handles the logical operations of the choke control system, including processing instrument measurements and operator input data to produce control signals for operating the choke, the choke actuator and the various valves associated with the choke manifold. The programmable controller is typically either an electronic digital computer and/or a programmable logic controller (PLC). The present invention further contemplates the two-way communication between the choke control system and the Internet via a satellite linkage.