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| Number | Title | Issue Date |
| 4230180 | Isolating packer units in geological and geophysical measuring casings The isolating packer unit is made up of a cylindrical measuring casing one end of which is connected by a cylindrical coupler tube to an end of a similar measuring casing, this coupler tube having a measuring port normally closed by a valve which is opera... | 10/28/1980 |
| 4222438 | Reservoir fluid sampling method and apparatus Determinations are made of the conditions in a fluid-containing well penetrating a fluid-producing subterranean reservoir by isolating an interval in the well which penetrates the fluid-producing reservoir, withdrawing fluid from the interval and determin... | 09/16/1980 |
| 4160622 | Portable water sampling apparatus Portable, self-powered water pumping apparatus for use in sampling water in remotely located wells comprises a wheeled hose reel cart which supports a long length of co-extruded plastic hose or tubing. The co-extrusion comprises a small diameter portion o... | 07/10/1979 |
| 4125165 | Annulus pressure controlled test valve with locking annulus pressure operated pressure trapping means Well test apparatus having, in a well, an annulus therearound. An annular housing has a valve for the control of fluid flow through the housing. A pressure chamber is provided within the housing. Lockable pressure trapping means is responsive to annulus p... | 11/14/1978 |
| 4113012 | Reclosable circulation valve for use in oil well testing Disclosed is a circulation valve for use in the testing of an oil well wherein the circulation valve may be reclosed by application of well annulus pressure to allow a subsequent treating or testing program. A spring means is subjected to well annulus pre... | 09/12/1978 |
| 4105075 | Test valve having automatic bypass for formation pressure Well test apparatus having, in a well, an annulus therearound. An elongated housing has a fluid passage extending longitudinally therethrough and a fluid passage opening and closing means for such passage. A further fluid passage permits fluid flow throug... | 08/08/1978 |
| 4088187 | Well steam sampler apparatus and method of forming and using a well steam sampler Two methods and a steam sampler are disclosed for sampling steam, as at any desired depth in a steam injection well for determining the quality of the saturated steam just prior to penetrating the formation. The sampler comprises an elongated cylindrical ... | 05/09/1978 |
| 4069865 | Bottom hole fluid pressure communicating probe and locking mandrel A well bottom hole fluid pressure measuring structure including external to internal pressure transducer fluid passage communicating structure with pressure balancing on engaged probe members to prevent undesired pressure lift separation of one probe sect... | 01/24/1978 |
| 4063593 | Full-opening annulus pressure operated sampler valve with reverse circulation valve A normally open oil well sampler valve which provides a fully open testing flow path therethrough is presented, wherein the sampler valve is closed under hydraulic control after a predetermined pressure increase in the well annulus pressure. The sampler i... | 12/20/1977 |
| 4059153 | Weight and pressure operated well testing apparatus and its method of operation A method and apparatus are presented which are particularly useful in testing the production capabilities of offshore oil wells. The apparatus includes a normally closed, weight operated valve which opens a preset delay after the weight operated valve is ... | 11/22/1977 |
| 4044829 | Method and apparatus for annulus pressure responsive circulation and tester valve manipulation A releasably locked closed circulation valve is introduced into a well bore as part of a drill string. The annulus between the drill string and the well bore, or casing affixed to the well bore, is sealed. Pressure is applied to the annulus and the valve ... | 08/30/1977 |
| 4031957 | Method and apparatus for testing and treating well formations A single trip method of testing and treating a down hole formation in which conventional drill stem testing can be carried out followed by acidizing or other treatment of the formation without the need to remove the drill stem test string, the method empl... | 06/28/1977 |
| 3986553 | Fluid sampling vessel A sampling vessel, adpated particularly for use in geothermal bores, constructed principally of stainless steel and opened at depth without ancillary means such as messengers by causing an inertial mechanism to break a frangible seal.... | 10/19/1976 |
| 3981189 | Methods and steam samplers with inertial latch Two methods and two steam samplers are disclosed for sampling steam, at any location or depth in a steam injection well for determining the quality of the saturated steam at that location. The samplers each comprise an elongated cylindrical vessel with a ... | 09/21/1976 |
| 3976136 | Pressure operated isolation valve for use in a well testing apparatus and its method of operation In a well testing tool having a spring whose biasing force is supplemented by the hydrostatic pressure in the well annulus at the testing depth, a method and apparatus for isolating the spring from the pressure in the well annulus utilizing the pressure d... | 08/24/1976 |
| 3969937 | Method and apparatus for testing wells Method and apparatus for testing wells where extremely high temperatures and pressures are to be encountered in the zone under test. The apparatus provides means for testing and trapping samples of well fluid from the formation in the zone under test for ... | 07/20/1976 |
| 3964544 | Pressure operated isolation valve for use in a well testing and treating apparatus, and its method of operation In a well testing tool having a spring whose biasing force is supplemented by the hydrostatic pressure in the well annulus at the testing depth, a method and apparatus for isolating the spring from the pressure in the well annulus utilizing the pressure d... | 06/22/1976 |
| 3957117 | Method and apparatus for bottom hole testing in wells Method and apparatus for bottom hole testing in producing or injection wells under pressure employing a tool adapted to be lowered on a flexible line to sampling depth in a well, the tool including a first section containing a closed sample chamber detach... | 05/18/1976 |
| 3934469 | Method and steam samplers Two methods and two steam samplers are disclosed for sampling steam, as at the bottom of a steam injection well for determining the quality of the saturated steam just prior to penetrating the formation. The samplers each comprises an elongated cylindrica... | 01/27/1976 |
| 3930754 | Portable water sampling apparatus Portable, self powered water pumping apparatus for use in sampling water in remotely located wells comprises a wheeled hose reel cart which supports a long length of plastic hose or tubing. The tubing has a small diameter length of inner tubing telescoped... | 01/06/1976 |
