Fred E. Watkins
Engineering at Lynnview Dr, Houston, TX

5257665, Nov 2, 1993

Aug 27, 1992

7/936606

Fred E. Watkins - Houston TX

Camco International Inc. - Houston TX

E21B 4300

166372

A method and system for recovering fluids from a hydrocarbon-bearing subsurface formation includes a first tubing string run into the well and a second tubing string run within the first tubing string. The annulus between the first and second tubing strings is sealed above a liquid level in the well and at least one fluid passageway is provided between the first and second tubing strings at a location between the liquid level and adjacent the annulus seal. The difference of the liquid head between the inside of the second tubing string opposite the at least one fluid passageway and the outside of the second tubing string (i. e. the first and second tubing string annulus) provides the casing annulus-to-tubing differential pressure that forces gas above the annulus fluid level to pass through the at least one fluid passageway and re-enter the fluid stream in the second tubing string. As less gas or more liquid is produced, the liquid level in the annulus rises and less pressure differential is available to force the gas through the at least one fluid passageway; therefore, less gas will flow into the second tubing string fluid. If more gas or less liquid is produced, the liquid level in the annulus will drop; thereby, creating more pressure differential and more gas will pass into the second tubing string.

4415028, Nov 15, 1983

Sep 8, 1981

6/300087

Fred E. Watkins - Houston TX

Camco, Incorporated - Houston TX

E21B 2300, E21B 3406

166206

An apparatus for measuring bottom hole conditions such as pressure in the tubing of a well including a locking and sealing sub to lock into and seal against the interior of the tubing, an isolation valve connected in the sub and a measuring instrument connected to the valve for measuring conditions in the tubing. The isolation valve has a bore with an annular seat in the bore and side ports leading into the bore below the seat. A valve element is longitudinally movable in the valve between an open position below the ports and a closed position against the seat and includes an elongate mandrel having a backup shoulder. A latch mechanism initially holds the valve in the open position and includes a collet member initially engaging the mandrel and holding the valve element in the open position and the collet is held in a latched position by a spring loaded backup shoulder. Spring means yieldably urge the collet out of engagement with the mandrel and close the valve when the backup shoulder is moved out of engagement with a collet. The valve flow passageway is as large as the bore through the locking sub.

4159643, Jul 3, 1979

Jul 31, 1978

5/929154

Fred E. Watkins - Houston TX

Camco, Incorporated - Houston TX

E21B 4706

73155

A method of and apparatus for measuring bottom hole pressure in the tubing of a well by installing an isolation assembly in the tubing by a locking and sealing device in which the assembly includes first and second ports in communication between the interior of the assembly and the interior of the tubing. A sensor prong is releasably installed in the isolation assembly and includes a pressure measuring instrument releasably connected thereto. After the well is flowed through the first port, the first port is closed by actuation of the prong, and pressure measurements are taken through the second port by the pressure measuring instrument. After completion of the measurement, the measuring instrument may be released from the prong and retrieved. The prong is thereafter retrieved. The first port, which is larger than a second port, is initially releasably held open.

4161984, Jul 24, 1979

Sep 11, 1978

5/940819

Fred E. Watkins - Houston TX

Camco, Incorporated - Houston TX

E21B 2302

166315

A well locking device and method of operation including a well lock and a landing nipple for locking well equipment in the production string of oil and/or gas wells. The well lock includes two sets of locking dogs, one of which locks the well lock in the landing nipple and holds against loads either from above or below the lock. The second set of locking dogs prevents the release of the well lock from the nipple when a pressure differential exists across the lock. A locking nipple includes first and second recesses and a stop shoulder and the coacting well lock includes a housing carrying first and second locking dogs in which the vertical spacing of the first and second locking dogs is less than the vertical distance between the tops of the first and second recesses. A seal is positioned on the exterior of the well lock housing and adapted to seal in the locking nipple, and locating means are provided on the housing for engaging the stop shoulder of the nipple. The lock can be released only by moving it downwardly and then upwardly, but any pressure below the lock sufficient to lift the lock back up after being moved downwardly will not allow the lock to be released.

4160484, Jul 10, 1979

Jan 16, 1978

5/869556

Fred E. Watkins - Houston TX

Camco, Incorporated - Houston TX

E21B 4312

166317

A well safety valve for controlling the fluid flow through a well tubing in which the valve is biased closed. When fluid control pressure is supplied from the well surface, the valve is opened, but the valve closes when the control pressure exceeds a predetermined value. The tubular member controlling the actuation of the valve member includes a first upper and a second lower telescoping section with releasable locking means normally securing the telescoping sections together. A stop shoulder is positioned in the path of movement of the second section in the opening direction for actuating the release of the locking means when the control fluid force exceeds said predetermined value, and the second telescoping section is moved in a closing direction for closing the valve member when the locking means is released. The locking means may be either a shear pin or a resettable lock.

3993129, Nov 23, 1976

Sep 26, 1975

5/616963

Fred E. Watkins - Houston TX

Camco, Incorporated - Houston TX

E21B 4312

166319

A fluid injection valve for use in a well tubing having an opening therein in which the valve controls the flow of fluid flowing between the outside of the tubing and the inside of the tubing through the opening. A spring-loaded relief valve element yieldably closes a port in the valve against the flow of fluid and a closed flexible pressurized chamber is provided with one end being movably positioned against the valve element. The exterior of the chamber is exposed to the valve outlet pressure so that in the event that the outlet pressure drops below a predetermined amount, the chamber will expand and act against the valve element to close the valve. The chamber may be a bellows and the cross-sectional area of the chamber is preferably greater than the cross-sectional area of the port to provide a closure force sufficient to overcome a hydrostatic head outside of the tubing.

4077473, Mar 7, 1978

Apr 18, 1977

5/788190

Fred E. Watkins - Houston TX

Camco, Incorporated - Houston TX

E21B 4312

166323

A well safety valve for controlling the fluid flow through a well tubing in which the valve closure member is controlled by a longitudinal movable tubular member which opens and closes the valve, can lock the valve in an open position, can telescopically collapse to avoid damage to the valve, and can be reset either manually or automatically. The tubular member includes first and second telescoping sections which are releasably locked together in an intermediate extended position for normally opening and closing the valve on movement of the tubular member. The releasable locking means is constructed to release upon the application of a predetermined force less than a force sufficient to cause damage to the valve whereby on application of an excessive force the sections will telescope towards each other preventing damage to the valve. Coacting shoulder means are provided between the valve body and lower telescoping member to automatically extend the telescoping sections on upward movement of the tubular member.

4254829, Mar 10, 1981

Sep 24, 1979

6/078112

Fred E. Watkins - Houston TX

Camco, Incorporated - Houston TX

E21B 2302

166134

In a well lock and a locking nipple for use in a tubing in a well in which the locking nipple includes first and second recesses and a stop shoulder and the well lock includes a locking housing carrying first and second locking dogs, seal means on the exterior of the housing for sealing with the nipple, a resiliently outwardly urged locator having a shoulder for engaging the stop shoulder, a mandrel telescopically positioned in the housing, a locking shoulder on the mandrel locking the first locking dogs in the first recess and means on the mandrel engaging the second locking means for preventing unlocking of the first locking dogs if pressure is applied to the seal to move the housing upwardly, the improvement in which the distance between the bottom of the first recess and the locking shoulder is greater than the distance between the bottom of the first locking dogs and the locator shoulder whereby the first locking dogs lock the device against upwardly and downwardly forces and the locator is retracted out of contact with the stop shoulder.

3981358, Sep 21, 1976

Nov 14, 1975

5/632032

Fred E. Watkins - Houston TX
James R. Reaux - New Orleans LA

Camco, Incorporated - Houston TX

E21B 4312

166224A

In a well safety valve for controlling the fluid flow through a well tubing in which the valve closure means is controlled by a longitudinal movable tubular member, the improvement of a fail-safe mechanism for avoiding damage to the valve by avoiding excessive operating forces. The tubular member includes first and second telescoping sections which are releasably locked together in an intermediate extended position for normally opening and closing the valve on movement of the tubular member. The releasable locking means is sized to release upon the application of a predetermined force less than a force sufficient to cause damage to the valve whereby upon application of an excessive force the sections will telescope towards each other preventing damage to the valve. Tool engaging means are provided on the second telescoping section for repositioning the tubular sections relative to each other or for extending the second section for locking the valve closure member in the open position. A third section may be provided telescopically engaging the first section and positioned axially aligned above the second section in which one-way clutch means is provided between the first and third sections allowing downward movement of the third section relative to the first section with tool engaging means on the third section for moving the third section downwardly for engaging the second section and locking the second section in an extended lockout position.

4106563, Aug 15, 1978

Nov 3, 1977

5/848008

Alvin O. Gatlin - Houston TX
Gilbert H. Tausch - Sugar Land TX
Fred E. Watkins - Houston TX

Camco, Incorporated - Houston TX

E21B 2302

1661175

A mandrel for use in a well tubing in which the mandrel body has an open bore for alignment with the well tubing and a sidepocket offset from the open bore for receiving flow control devices. An integrally forged sub is welded to the top of the body and includes an actuating shoulder angularly spaced from the axis of the offset pocket a predetermined amount and a guide surface is positioned below the shoulder and directed upwardly towards the shoulder. A deflector guide is positioned in the offset bore above the pocket and includes a pair of rails forming a guide path which allows the entrance of flow control devices in the pocket but prevents the entrance of open bore tools into the guide path. The deflector guide and the pocket are telescopically secured to each other by coacting flat surfaces for insuring transverse alignment therebetween and include abutting coacting shoulders for maintaining proper axial spacing between the locking lug and the pocket.