| Patents for E21B 49 - Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells (11,875) |
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| 12/06/1989 | EP0344926A1 Material stress monitor |
| 12/05/1989 | US4884439 Hydraulic circuit use in wireline formation tester |
| 11/28/1989 | US4883123 Above packer perforate, test and sample tool and method of use |
| 11/14/1989 | US4880056 Hydraulically activated firing head for well perforating guns |
| 11/14/1989 | US4879900 Hydraulic system in formation test tools having a hydraulic pad pressure priority system and high speed extension of the setting pistons |
| 11/08/1989 | EP0341109A1 Method for evaluating the organic material content of sediments from data acquired by borehole logging probes |
| 11/07/1989 | US4879654 Drilling fluid |
| 11/07/1989 | US4878538 Perforate, test and sample tool and method of use |
| 11/07/1989 | US4878382 Method of monitoring the drilling operations by analyzing the circulating drilling mud |
| 11/02/1989 | EP0339752A1 Pore pressure formation evaluation while drilling |
| 10/31/1989 | US4876886 Method for detecting drilling events from measurement while drilling sensors |
| 10/18/1989 | CN1036431A Drill stem test method and apparatus |
| 10/17/1989 | US4875031 Vapor monitoring system |
| 10/11/1989 | EP0336491A1 Method for detecting drilling events from measurement while drilling sensors |
| 10/03/1989 | US4871023 Adding phosphorus, arsenic, antimony,and bismuth containing compounds,and hydrogen ion producing cations |
| 10/03/1989 | US4871019 Wellbore fluid sampling apparatus |
| 09/26/1989 | CA1261978A1 Method for determining porosity, clay content and mode of distribution in gas and oil bearing shaly sand reservoirs |
| 09/26/1989 | CA1261053A1 Core monitoring device |
| 09/26/1989 | CA1260825A1 Optimum production rate for horizontal wells |
| 09/26/1989 | CA1259819A1 Hydrocarbon well test method |
| 09/19/1989 | US4867254 Method of controlling fluid influxes in hydrocarbon wells |
| 09/19/1989 | CA1259685A1 Process and apparatus for monitoring and controlling the flammability of gas from an in-situ combustion oil recovery project |
| 09/06/1989 | EP0331580A1 A sonde for taking fluid samples, in particular from inside an oil well |
| 09/06/1989 | EP0330829A1 Method and device for taking soil samples |
| 09/05/1989 | US4862962 Matrix treatment process for oil extraction applications |
| 08/29/1989 | US4860836 Method and apparatus for indicating sample collection times during well drilling |
| 08/29/1989 | US4860582 Method and device for assessing the clogging risks of a well or bore hole passing through a porous revervoir, more particularly a geological formation |
| 08/29/1989 | US4860581 Down hole tool for determination of formation properties |
| 08/29/1989 | US4860580 Formation testing apparatus and method |
| 08/29/1989 | CA1258848A1 Apparatus and method for hard rock sidewall coring in a borehole |
| 08/24/1989 | DE3804140A1 Method and device for the simultaneous multiple taking of samples of ground-waters from ground layers of different depths, especially of waters loaded with volatile materials |
| 08/16/1989 | EP0327667A2 Method and device for taking soil samples |
| 08/15/1989 | US4857473 Water sampling system |
| 08/15/1989 | US4856585 Tubing conveyed sampler |
| 08/09/1989 | EP0326991A1 A submarine vehicle intended to measure data at the deep ocean sea-bottom |
| 08/01/1989 | US4852650 Silicon carbide or nitride;enhanced oil recovery |
| 08/01/1989 | US4852400 Method and apparatus for determining physical integrity of geological strata |
| 08/01/1989 | US4852399 Method for determining drilling conditions while drilling |
| 07/27/1989 | WO1989006740A1 Shut-in tool |
| 07/25/1989 | US4851665 System for sensing ions in aqueous solution |
| 07/25/1989 | US4850431 Method of forming a plurality of spaced substantially parallel fractures from a deviated well bore |
| 07/18/1989 | US4848463 Surface read-out tester valve and probe |
| 07/18/1989 | US4848461 Method of evaluating fracturing fluid performance in subsurface fracturing operations |
| 07/11/1989 | US4846364 Transportation container for fluid/gas samples |
| 07/11/1989 | US4846280 Drill stem test method and apparatus |
| 07/11/1989 | US4845982 Hydraulic circuit for use in wireline formation tester |
| 07/11/1989 | CA1257197A1 Well tool for testing or treating a well |
| 07/04/1989 | US4843878 Method and apparatus for instantaneously indicating permeability and horner plot slope relating to formation testing |
| 06/27/1989 | US4842064 Well testing apparatus and methods |
| 06/20/1989 | US4840910 Controlling sulfide scavenger content of drilling fluid |
| 06/20/1989 | CA1256018A1 Push-off pistons |
| 06/13/1989 | US4838349 Apparatus for testing selected zones of a subterranean bore |
| 06/13/1989 | US4838079 Multi-channel pipe for monitoring groundwater |
| 06/06/1989 | US4836280 Method of evaluating subsurface fracturing operations |
| 05/30/1989 | US4834194 Method and apparatus for detection of volatile soil contaminants in situ |
| 05/30/1989 | US4833915 Method and apparatus for detecting formation hydrocarbons in mud returns, and the like |
| 05/30/1989 | US4833914 Pore pressure formation evaluation while drilling |
| 05/24/1989 | EP0316985A1 A method of monitoring the drilling operations by analysing the circulating drilling mud |
| 05/23/1989 | US4832121 Methods for monitoring temperature-vs-depth characteristics in a borehole during and after hydraulic fracture treatments |
| 05/23/1989 | CA1254674A1 Method of geophysical exploration in a well borehole |
| 05/16/1989 | US4830107 Well test tool |
| 05/16/1989 | US4830106 Simultaneous hydraulic fracturing |
| 05/16/1989 | US4829835 Adjustable sand relief valve for sand laden crude oil |
| 05/16/1989 | US4829817 Soil-percolation testing method and apparatus |
| 05/16/1989 | US4829816 Method and apparatus for testing spotting fluids for releasing stuck drill pipe |
| 05/16/1989 | CA1254130A1 Pump open safety valve |
| 05/09/1989 | US4828028 Method for performing fracturing operations |
| 05/09/1989 | US4827823 Bullet firing mechanism with retrieval cable |
| 04/25/1989 | CA1253231A1 Method of analyzing vibrations from a drilling bit in a borehole |
| 04/25/1989 | CA1253012A1 Method for estimating porosity and/or permeability |
| 04/18/1989 | US4821801 Producing asphaltic crude oil |
| 04/11/1989 | CA1252382A1 Method of well testing |
| 04/06/1989 | WO1989002972A1 Methods for monitoring temperature-vs-depth characteristics in a borehole |
| 04/05/1989 | CN2035382U Theft-proof sampler for pumping well |
| 04/04/1989 | US4817723 Apparatus for retaining axial mandrel movement relative to a cylindrical housing |
| 04/04/1989 | US4817718 Hydraulically activated firing head for well perforating guns |
| 04/04/1989 | US4817711 System for recovery of petroleum from petroleum impregnated media |
| 04/04/1989 | CA1251924A1 Process for optimizing the noncondensible gas content of an oil-displacing steam-foam-forming mixture |
| 03/22/1989 | EP0308083A2 Device for sampling soils and retaining volatiles therein and method of using same |
| 03/22/1989 | CN2034615U Sampling device for freezen protection at portal of petroleum attraction well |
| 03/21/1989 | US4814614 Method for characterizing oil-bearing inclusions via fluorescence microspectrophotometry |
| 03/21/1989 | US4813278 Method of determining three-dimensional tectonic stresses |
| 03/14/1989 | US4811599 Borehole sampling |
| 03/07/1989 | US4809790 Device for sampling soils and retaining volatiles therein and method of using same |
| 03/07/1989 | CA1250826A1 Assessment of drilling conditions |
| 03/01/1989 | EP0305240A1 Method and device for modifying the transmission coefficient of the energy created by a borehole's seismic source towards geological formations |
| 03/01/1989 | EP0305178A1 Improvements in or relating to soil sampling |
| 03/01/1989 | EP0304434A1 Process and device for establishing the cohesion curve of an ocean floor at great depth |
| 02/28/1989 | US4807707 For sampling soil gas or ground water |
| 02/28/1989 | US4807469 Monitoring drilling mud circulation |
| 02/22/1989 | CN1031282A Method and device for improving coefficient of transmission to geological formations of energy created by well seismic source |
| 02/21/1989 | US4806153 Method and apparatus for investigating subsurface conditions |
| 02/21/1989 | US4805708 Dissolving in solvent, separtion, measurement of concentration of dissolved zinc |
| 02/14/1989 | US4804050 Method of underground fluid sampling |
| 02/14/1989 | US4804044 Perforating gun firing tool and method of operation |
| 02/14/1989 | US4804042 Bottom hole shut-in tool |
| 02/14/1989 | US4803873 Process for measuring flow and determining the parameters of multilayer hydrocarbon producing formations |
| 02/08/1989 | EP0302558A1 Method of analysing fluid influxes in hydrocarbon wells |
| 02/08/1989 | EP0302557A1 Method of controlling fluid influxes in hydrocarbon wells |
| 02/07/1989 | US4802359 Tool for measuring pressure in an oil well |