Abstract: An apparatus for providing a high torque pressure sleeve for easily drillable casing exit ports. A joint of tubular casing with a pre-formed window in the wall thereof has a tubular sleeve fixedly attached to the exterior of the tubular casing covering the window. The interior surface of the sleeve is sealed to the exterior of the tubular casing on opposite sides of the window. In use, the joint of the tubular casing is run down to the depth of interest in the earth wellbore and the window is oriented with respect to the formation of interest at the depth. The joint of tubular casing is then cemented in place, after which a whipstock is lowered into the wellbore, oriented and anchored therein. The assembly automatimuly fixes the axial and circumferential oriention of the whipstock within a surrounding casing joint and holds the assembly in place.

Abstract: The volume of clay within clay-bearing formations is determined throughout the formations. This volume of clay is then functionally related to measurements indicative of the formations. Utilizing measured formation characteristics representative of different clay types, such as potassium content or bound water content, the formation porosity measurements are extrapolated to indicate the porosity log measurements which would be yielded if the logging devices were responsive only to the clay within the formations. In addition the cation exchange capacity and the hydrogen index are used to determine volume, types and distribution of clays. These extrapolated measurements are then related to known or determinable formation characteristics to determine additional formation properties such as porosity, permeability, and fluid saturation characteristics.

Abstract: A calibration and response quality verification system for neutron logging instruments includes a chamber filled with a neutron moderating and absorbing solution and sufficiently sized to provide an effectively infinite environment with longitudinal homogenity. A neutron tool is disposed within a calibration tube traversing the chamber. A plurality of rod members are selectively inserted into the annular space between the instrument and tube to provide a plurality of selectable and precisely repeatable environments to represent an extensive range of formation porosities.

Abstract: A method of increasing the detonation velocity of explosive detonating fuse by subjecting it to elevated temperatures and pressure is disclosed. Detonation fuse is subjected to temperature in the range 225.degree. F. to 250.degree. F. with pressures in the range of 10,000 psi to 20,000 psi for a time duration in the range of 30-60 minutes.

Abstract: Apparatus for collecting a plurality of samples of fluids in earth formations traversed by a wellbore includes a pressure sensor for deriving a pressure measurement and a temperature sensor for simultaneously deriving a temperature measurement. The pressure measurement signals and the temperature measurement signal are transmitted to processing circuitry using a narrow band frequency modulated scheme. The temperature measurement is used to provide a real time temperature compensated pressure measurement.

Abstract: Apparatus for coupling wireline tools to coil tubing wherein a pull-out, disconnect, is provided. The pull-out consists of two tubular members with flared, bell-shaped portions, one such portion being coaxially disposed within the other. A ferrule applies pressure to the interface of the surfaces of said flared portions. Sufficient tension on the coil tubing pulls the flared portion of the interior member through the neck and out of the exterior member. Pilot valves prevent intrusion of bore hole fluid into the coupling device during logging and into the coil tubing if a pull-out has been effected.

Abstract: A method for evaluating the extent of deterioration of pipes whereby an inspection instrument is passed through a length of casing to determine the extent of corrosive deterioration. The resulting measurements generated by the inspection instrument are processed to exclude those responses caused by the structural configuration of the casing length under inspection. The remaining responses are then analyzed to compile a detailed interpretation of the measurements including specific information regarding the state of deterioration of the length of casing under inspection.

Abstract: An implosion shaped charge device for jet perforating. In its overall concept, the implosion shaped charge perforator comprises a liner of implosive geometry, a primary explosive contiguous to the liner for providing implosion impulse to such and means for detonating the primary explosive. In a first embodiment the detonating means is an explosively actuated impact detonator. In a second embodiment the detonating means is a laser initiated explosive detonator. Both embodiments may be utilized in a perforating gun for perforating subsurface earth formations. In the operation of the embodiments the primary explosive is detonated with the resulting detonation wave approximately constantly accelerating the liner to radially converge to a small volume, from which a jet is propagated in the direction of the maximum pressure gradient.

Abstract: An implosion shaped charge device for jet perforating. In its overall concept, the implosion shaped charge perforator comprises a liner of implosive geometry, a primary explosive contiguous to the liner for providing implosion impulse to such and means for detonating the primary explosive. In a first embodiment the detonating means is an explosively actuated impact detonator. In a second embodiment the detonating means is a laser initiated explosive detonator. Both embodiments may be utilized in a perforating gun for perforating subsurface earth formations. In the operation of the embodiments the primary explosive is detonated with the resulting detonation wave approximately constantly accelerating the liner to radially converge to a small volume, from which a jet is propagated in the direction of the maximum pressure gradient.

Abstract: An implosion shaped charge device for jet perforating. In its overall concept, the implosion shaped charge perforator comprises a liner of implosive geometry, a primary explosive contiguous to the liner for providing implosion impulse to such and means for detonating the primary explosive. In a first embodiment the detonating means is an explosively actuated impact detonator. In a second embodiment the detonating means is a laser initiated explosive detonator. Both embodiments may be utilized in a perforating gun for perforating subsurface earth formations. In the operation of the embodiments the primary explosive is detonated with the resulting detonation wave approximately constantly accelerating the liner to radially converge to a small volume, from which a jet is propagated in the direction of the maximum pressure gradient.

Abstract: Apparatus for positioning a detector at a plurality of depth locations within a borehole includes an elongated body member having a pair of diametrically opposed hydraulic pad displcement members mounted thereon. A pad mounting member is pivotally attached to each pad displacement member and a pair of borehole wall contacting members are pivotally attached to each pad mounting member. A signal detector is mounted behind one or more of the pad members. At each test depth a hydraulic power system deploys the pad displacement members from the body to an extended position and extends the wall engaging pad members into contact with the borehole wall. A redundant hydraulic safety system is provided in case of electrical system failure for releasing the pad member.

Abstract: Method of determining the flow velocity of fluid flowing within the borehole of a well, traversing subsurface formations of the earth, with a nonradioactive tracer. A population of neutrons is generated in a stream of fluid so as to engulf a detector capable of detecting neutron capture. A substance of large thermal neutron capture cross section is injected into a stream of fluid a known distance upstream from a detector. Measurement of the elapsed time for the capturing substance to travel a known distance, and, by neutron capture, produce a minimum indication at the detector indicating the presence of said capturing substance at its location of closest proximity to the detector, allows calculation of the velocity of said stream of fluid.

Abstract: Apparatus for positioning a detector at a plurality of depth locations within a large diameter borehole includes an elongated body member having a pair of diametrically opposed hydraulic pad displacement members mounted thereon. A pad mounting member is pivotally attached to each pad displacement member and a pair of borehole wall contacting members are pivotally attached to each pad mounting member. A signal detector is mounted behind one or more of the pad members. At each test depth a hydraulic power system deploys the pad displacement members from the body member to an extended position and extends the wall engaging pad members into contact with the borehole wall.

Abstract: A generalized computer-based system and method for acquisition of nuclear well logging data, including downhole generation of energy and time spectral information. A downhole instrument traverses a borehole introducing high energy neutrons into the formation at prescribed depths. Resultant gamma rays are detected and converted into pulses which are amplified and conditioned.A downhole multi-parameter analyzer stores pulse height and arrival time for each detected gamma ray whereby time and energy spectra are formed. Spectra include, alone or in combination, time spectra of the neutron source, inelastic and capture energy spectra. From the source time spectra, peaks are detected and capture and inelastic gates referenced thereto. Also thermal neutron decay between source bursts is derived. From the energy spectra peaks including hydrogen or iron are detected and used for calibration and automatic gain control of the gamma ray detector.

Abstract: Method and apparatus for automatically separating a wireline conveyed through-tubing perforating gun from a cable assembly. The gun is joined to a hollow sleeve on the cable assembly by a sub closely received in each end retained thereto by shear members. The force of the explosion upon firing the gun shears the shear members and drives the sub into the sleeve, allowing the gun to drop into the well.

Abstract: The volume of clay within clay-bearing formations is determined throughout the formations. This volume of clay is then functionally related to measurements indicative of the formations. Utilizing measured formation characteristics representative of different clay types, such as potassium content or bound water content, the formation porosity measurements are extrapolated to indicate the porosity log measurements which would be yielded if the logging devices were responsive only to the clay within the formations. In addition the cation exchange capacity and the hydrogen index are used to determine volume, types and distribution of clays. These extrapolated measurements are then related to known or determinable formation characteristics to determine additional formation properties such as porosity, permeability, and fluid saturation characteristics.

Abstract: A method for determining the type of corrosion present in deteriorating pipes. An inspection instrument is passed through a length of casing to determine the extent of corrosive deterioration. The resulting measurements generated by the inspection instrument are processed to exclude those responses caused by the structural configuration of the casing length under inspection. The remaining responses of one of the measurements are then analyzed to provide useful information regarding the type of corrosion present at defects in the casing length under inspection and to further provide information necessary to make a detailed analysis of the defects present in the casing length under inspection.

Abstract: Method and apparatus for nondestructive inspection of oilfield piping includes first and second pole pieces and a electromagnetic core therebetween for emitting a unidirectional magnetic flux field into the piping. A plurality of detector shoes each house a flux leakage coil assembly and a corresponding eddy current coil assembly. Circuits receive, process and transmit signals from the individual flux leakage coil assemblies to the surface. At the surface each signal is processed individually to provide indications of mass loss and/or gain as detected by each flux leakage coil assembly.

Abstract: A computer-based system and method for acquisition of nuclear well logging data, including downhole generation of energy and time spectral information. For acquiring energy spectrum data, a downhole multi-parameter analyzer is provided including a pulse height analyzer and memory. The analyzer converts each gamma ray pulse height into a digital code by peak detection, level and pulse pile-up discrimination, sample-and-hold, and analog-digital conversion. The digital code includes the address of a unique memory location or channel corresponding to the energy of the particular gamma ray. After a preselected time interval the memory channels collectively contain counts for each incremental energy band in the desired energy spectrum. The memory may then be interrogated by the downhole CPU for presentation of a gamma ray emission versus energy level plot. For acquiring temporal spectrum data, the multi-parameter analyzer also includes a memory address generator.

Abstract: A method of identifying the presence, type and extent of internal casing wear and distinguish worn casing from various types of unworn casing. Two inspection instruments are tied together in the combination traverses a section of casing where information on internal wear is desired. The first inspection instrument generates two signals related to the minimum and maximum wall thickness present at each location within the casing section. The second inspection instrument generates a signal related to the degree of phase shift at each location of the casing section.