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7350568 |
A method for logging a well. Includes receiving energy with at least one array of elements coupled to a drill bit, wherein the at least one array of elements functions as an electronic array. An apparatus for logging a well includes a dr...
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7347280 |
Specific apparatus and associated methods are described for use in establishing the positions of locating field detectors and for path mapping within a region for the purpose of tracking and/or guiding the movement of an underground bori...
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7178607 |
A while drilling system and method for determining annular pressure while drilling is provided. The system is positioned in a drilling tool suspended from a drilling rig via a drill string. The system includes at least one drill collar, ...
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7080699 |
A gap collar for an electromagnetic communication unit of a downhole tool positioned in a wellbore is provided. The downhole tool communicates with a surface unit via an electromagnetic field generated by the electromagnetic communicatio...
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7077200 |
A light generating system for use in a wellbore comprising a light generating transducer in the wellbore, the light generating transducer adapted to transform a physical state of a parameter in the wellbore to optical energy; recording e...
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7059404 |
An apparatus and method are provided for varying an operating parameter for a nuclear gamma ray tool for evaluating the integrity of gravel packing. The gamma ray outpat intensity and area of investigation are altered by changing a sourc...
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7021403 |
Specific apparatus and associated methods are described for use in establishing the positions of locating field detectors and for path mapping within a region for the purpose of tracking and/or guiding the movement of an underground bori...
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6907944 |
A tool is presented for making density measurements of a formation surrounding a wellbore, comprising a collar housing in a drill string. The housing has at least one first section with a first outer diameter, and at least one sensing se...
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6877559 |
A method for retrieving a formation fluid sample through a cased borehole utilizing a sampling tool. Sampling tool straddle packers are set about a first set of perforations and annular fluid is drained from the isolated zone, through a ...
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6868038 |
The present invention provides a method of performing the time picking step in a VSP (vertical seismic profile) survey. In a preferred embodiment of the invention the time picking step is carried out on a combined three-component amplitu...
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6814162 |
A drill bit, comprising a bit body, a sensor disposed in the bit body, a single journal removably mounted to the bit body, and a roller cone rotatably mounted to the single journal.
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6791469 |
A method for improving ROP and reducing hazards in drilling subterranean wells by using an acoustical system 15 to look ahead of the drill bit 14 , detects and analyzes geologic features ahead of the bit 14 which may be qualified as...
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6648083 |
A method is disclosed for determining a characteristic of a mud mixture surrounding a drilling tool within a borehole in which a drilling tool is received. The method includes turning the tool in the borehole. Energy is applied into the ...
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6516663 |
Apparatus and method for accurately logging a drill-stem test tool into place as the DST tool is conveyed by drill pipe or tubing to the desired location are provided. One aspect of the invention provides an apparatus for logging into pl...
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6474152 |
The compressibility of a formation hydrocarbon sample is determined downhole by using a borehole tool to obtain the sample downhole, and, at two different pressures, subjecting the sample to near infrared illumination and conducting spec...
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6242268 |
Homogeneous assays for determining quantitatively the extent of a specific binding reaction can be carried out effectively on very dilute solutions using measurements of fluorescence if a fluorescence measurement scheme that is capable o...
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5842528 |
A method and apparatus for drilling and completing a bore hole is disclosed. Generally, the method comprises the steps of positioning a workstring in the well, with the workstring having attached thereto a bottom hole assembly. The botto...
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RE35790 |
Improved techniques are provided for drilling a deviated borehole through earth formations utilizing a rotary bit powered by a drill motor, and for obtaining information regarding the borehole or earth formations while drilling. An incli...
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5667023 |
A method and apparatus for drilling and completing a bore hole are disclosed. The method comprises positioning a work string in the well, with a bottom hole assembly attached. The bottom hole assembly can include a drill bit, a drilling ...
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5251708 |
A downhole tool for use in measurement-while-drilling applications includes modular ring connectors on opposed ends thereof with the ring connectors being interconnected by a single bus for delivering both power and ground.
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5163521 |
Improved techniques are provided for drilling a deviated borehole through earth formations utilizing a rotary bit powered by a drill motor, and for obtaining information regarding the borehole or earth formations while drilling. An incli...
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4691772 |
A method for determining the permeability profile of an uncased borehole penetrating a subterranean formation by a natural gamma ray well logging technique in which particles containing gamma ray emitting nuclides are added to a thixotro...
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4601353 |
A method for drilling a drainhole through a subsurface formation without intersecting upper or lower boundaries thereof in which a directionally sensitive measurement while drilling device carried on the drainhole string is used to measu...
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4297699 |
The present invention comprises a short-pulse radar guidance tool which determines borehole-to-roof and borehole-to-floor distances along a coal seam by measuring the travel times of electromagnetic pulses transmitted from the tool and r...
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4262964 |
The present invention contemplates a system for detecting an interface between a mineral seam and the surrounding earth formation utilizing a radiation source and a radiation receiver mounted on a miner having a positionable cutter assem...
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4224988 |
A device for and method of sensing conditions in a well bore by positioning a radioactive source adjacent the surface of the well bore for emitting a radioactive signal across the well bore. A means for detecting the radioactive signal i...
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4118623 |
A method is provided for determining the shale content of mined coal by monitoring the thorium content of the coal. Thorium content and ash content are shown to be related whereby a direct reading of the thorium will be indicative of the...
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4115688 |
A method for determining the distance from a given point in a coal seam to shale by sensing the thorium radiation from shale layers positioned about the coal seam. The invention is useful for maintaining a drill in a desired position in ...
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3823787 |
An apparatus for directing the drilling of a bore hole through a mineral vein which includes a drilling apparatus which has means for changing its direction near the bit, a guidance system mounted near the bit which includes a radiation ...
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3722606 |
An early warning detection method for predicting abnormal formation pressure in subterranean rock strata before it is drilled. The technique is to measure, on a sample removed from the well bore, the tendency of an atomic particle to esc...
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3690166 |
An instrument platform structure is lowered to the bottom of a body of water by means of a hoisting cable. A measuring instrument is lowered from the underwater platform structure by means of an instrument cable coupled to a spooling dru...
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3591235 |
A cutterhead for a mineral-mining machine, particularly a shearer-loader, comprises a rotary cutter equipped with fixed cutter tools distributed around the head. Adjacent to the periphery of the head but spaced from one another are mount...
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3566979 |
The particular embodiment described herein as illustrative of one form of the invention utilizes, in a drilling system, capsules which are moved at high velocities out the eye of the drill bit to be impacted with the formation being dril...
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3547189 |
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3412815 |
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3255353 |
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3242985 |
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3223184 |
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3205353 |
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3149490 |
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3115576 |
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3050141 |
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3016961 |
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3016960 |
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2965031 |
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2935612 |
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2728554 |
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2710925 |
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2692755 |
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2670179 |
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