| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 03/30/1999 | US5888022 Method and system for treating bio-degradable waste material through aerobic degradation |
| 03/30/1999 | US5887668 Wellbore milling-- drilling |
| 03/30/1999 | US5887657 Pressure test method for permanent downhole wells and apparatus therefore |
| 03/24/1999 | EP0903591A2 Method and apparatus for measuring resistivity of an earth formation |
| 03/24/1999 | EP0903463A2 Formation fracturing and gravel packing tool |
| 03/23/1999 | US5886255 Method and apparatus for monitoring mineral production |
| 03/23/1999 | US5884716 Constant bottom contact thruster |
| 03/23/1999 | US5884701 Dual downhole injection system utilizing coiled tubing |
| 03/19/1999 | CA2247636A1 Method and apparatus for measuring resistivity of an earth formation |
| 03/18/1999 | CA2247644A1 Apparatus for measuring and recording data from boreholes |
| 03/17/1999 | EP0902162A2 Transducer head assembly for well logging |
| 03/17/1999 | EP0901625A1 Process and devices for characterising ground water measurement points by distinguishing ground water from subterranean water accumulation |
| 03/16/1999 | US5883583 Imaging a completion string in a wellbore |
| 03/16/1999 | US5883516 Apparatus and method for electric field telemetry employing component upper and lower housings in a well pipestring |
| 03/16/1999 | US5881824 Bottomhole assembly orienting sub |
| 03/10/1999 | EP0900918A2 Method and apparatus for suppressing drillstring vibrations |
| 03/10/1999 | EP0900917A1 An apparatus and system for making at-bit measurements while drilling |
| 03/10/1999 | EP0900916A1 Method and apparatus for controlling the pumping rate in a well |
| 03/10/1999 | EP0900321A1 Pad production log tool |
| 03/10/1999 | EP0792407A4 Single-wire guidance system for drilling boreholes |
| 03/10/1999 | CN1210592A Sonic data logging system |
| 03/09/1999 | US5881310 Method for executing an instruction where the memory locations for data, operation to be performed and storing of the result are indicated by pointers |
| 03/09/1999 | US5880680 Apparatus and method for determining boring direction when boring underground |
| 03/09/1999 | US5878825 Underground propelling method |
| 03/09/1999 | US5878824 Boring tool or other device including thermal protection for an electronic component assembly and method |
| 03/04/1999 | WO1999010624A1 Method and system for cement bond evaluation in high acoustic velocity formations |
| 03/03/1999 | CN1042360C Suspended digital control marking device for well logging cable |
| 03/02/1999 | US5877996 Transducer arrangement |
| 03/02/1999 | US5875851 Static wellhead plug and associated methods of plugging wellheads |
| 03/02/1999 | CA2242505A1 Method and apparatus for enhancing pump-off controller performance |
| 02/25/1999 | WO1999009290A1 Drilling system with means for anchoring in the borehole |
| 02/24/1999 | EP0897456A2 Multi-lateral wellbore systems and methods for forming same |
| 02/24/1999 | CN1209184A Trencbless underground boring system with boring location |
| 02/24/1999 | CN1208809A Formation data sensing with deployed remote sensors during well drilling |
| 02/23/1999 | US5874676 Method and apparatus for acoustically investigating a casing with a swept frequency pulse |
| 02/19/1999 | CA2237017A1 Improved pulser |
| 02/18/1999 | WO1999007975A1 Method and apparatus for drilling and completing wells |
| 02/18/1999 | CA2268256A1 Method and apparatus for drilling and completing wells |
| 02/16/1999 | US5871047 Method for determining well productivity using automatic downtime data |
| 02/09/1999 | US5868557 For the remediation of a site contaminated with a hazardous substance |
| 02/09/1999 | US5868210 Method for recovering hydrocarbons from earth formations |
| 02/09/1999 | US5868201 Computer controlled downhole tools for production well control |
| 02/04/1999 | WO1999005478A2 Flow measurement mandrel |
| 02/04/1999 | WO1998050680A3 Monitoring of downhole parameters and tools utilizing fiber optics |
| 02/03/1999 | CN1206778A Method and apparatus for locating indexing systems in cased well and conducting multilateral branch operations |
| 02/02/1999 | CA2078090C Method and apparatus for transmitting information between equipment at the bottom of a drilling or production operation and the surface |
| 01/28/1999 | WO1999004139A1 Imaging a completion string in a wellbore |
| 01/27/1999 | CN2305485Y Small diameter babi caliper log downhole instrument |
| 01/26/1999 | US5864772 Apparatus, system and method to transmit and display acquired well data in near real time at a remote location |
| 01/26/1999 | US5864058 Detecting and reducing bit whirl |
| 01/26/1999 | US5864057 Method and apparatus for conducting well production tests |
| 01/26/1999 | CA2098677C Logging while drilling tools utilizing magnetic positioner assisted phase shifts |
| 01/21/1999 | WO1999002819A1 Computer controlled injection wells |
| 01/20/1999 | EP0892147A2 Dual downhole injection system utilizing coiled tubing |
| 01/20/1999 | CN1205388A Method and apparatus for acquiring data in hydrocarbon well |
| 01/19/1999 | US5861562 Flow measurement mandrel |
| 01/19/1999 | US5860483 Method for installing electronic equipment below soft earth surface |
| 01/13/1999 | EP0890014A1 Method and system for monitoring a characteristic of an earth formation in a well |
| 01/12/1999 | US5859430 From a formation traversed by a borehole |
| 01/12/1999 | US5857523 Well completion lubricator valve |
| 01/12/1999 | US5857322 Hybrid solar and fuel fired electrical generating system |
| 01/07/1999 | WO1999000578A1 Apparatus and method for determining integrity of oil well tubing |
| 01/07/1999 | WO1999000575A2 Drilling system with sensors for determining properties of drilling fluid downhole |
| 01/06/1999 | CN1203997A Underground isotope releaser driving device |
| 12/30/1998 | WO1998059221A1 Measurement of flow fractions, flow velocities, and flow rates of a multiphase fluid using nmr sensing |
| 12/30/1998 | WO1998059220A2 Measurement of flow fractions, flow velocities, and flow rates of a multiphase fluid using esr sensing |
| 12/30/1998 | WO1998059146A1 Earth formation surveying device |
| 12/30/1998 | CN2302336Y Oilwell thermal recovery bottom-hole liquid production profile surveying instrument |
| 12/30/1998 | CN1203671A Composite material structure having reduced signal attenuation |
| 12/30/1998 | CN1203670A Use of acoustic emission in rock formation analysis |
| 12/29/1998 | US5853054 2-Stage underreamer |
| 12/23/1998 | EP0885345A1 High pressure tree cap |
| 12/23/1998 | EP0766775B1 Logging or measurement while tripping |
| 12/23/1998 | EP0601046B1 Apparatus for transmitting instrumentation signals over power conductors |
| 12/23/1998 | CN2301534Y Pipe string pressure test pulling and running tool |
| 12/23/1998 | CN1202966A Automatic well test system and method of operating the same |
| 12/23/1998 | CN1202949A Method for qualifying a borehole survey |
| 12/22/1998 | US5850879 Between a down hole well tool and surface equipment |
| 12/17/1998 | WO1998057030A1 Control and monitoring system for chemical treatment of an oilfield well |
| 12/17/1998 | WO1998056466A1 A method and system for treating biodegradable waste material through aerobic degradation |
| 12/15/1998 | US5850624 Electronic compass |
| 12/15/1998 | US5850369 Method and apparatus for communicating data in a wellbore and for detecting the influx of gas |
| 12/10/1998 | WO1998055727A1 An erectable arm assembly for use in boreholes |
| 12/09/1998 | EP0882871A2 Formation data sensing with deployed remote sensors during well drilling |
| 12/09/1998 | EP0882870A2 A method of communicating data and control signals between a down hole well tool and surface equipment |
| 12/09/1998 | EP0882297A1 Treatment of radioactive material |
| 12/09/1998 | EP0882172A1 Downhole tool |
| 12/09/1998 | EP0866951A4 Differential pressure measurement systems for fluid streams |
| 12/09/1998 | EP0644979B1 Method and apparatus for inspecting subsurface environments |
| 12/09/1998 | CN2299940Y High-temperature resisting collector for annular space water detector |
| 12/03/1998 | WO1998054438A1 Bottomhole assembly orienting sub |
| 12/01/1998 | US5844136 Device for measuring the permeability of rock fragments |
| 12/01/1998 | US5842528 Method of drilling and completing wells |
| 11/26/1998 | WO1998053178A1 A centralizer casing collar locator |
| 11/26/1998 | WO1998053173A2 Improvements relating to strata logging on computer |
| 11/24/1998 | US5842149 Closed loop drilling system |
| 11/24/1998 | US5841734 Rotating acoustic transducer head for cement bond evaluation tool |
| 11/18/1998 | EP0877960A1 Sonic data logging system |
| 11/18/1998 | EP0877854A1 Small hole retrievable perforating system for use during extreme overbalanced perforating |
| 11/18/1998 | EP0717810B1 Method for detecting pressure measurement discontinuities caused by fluid boundary changes |