摘要:
Disclosed are a method and system for developing customized bound water transformations to obtain accurate determinations of non-producible water from nuclear magnetic resonance (NMR) logs. The approaches of this invention can be applied for in situ calibration where laboratory NMR measurements may not be possible or practical. In particular, a transformation model directly linking BVI and capillary pressure is developed by calibrating NMR derived BVI with the core data, the novel transformation model utilizes SBVI and/or CBVI models to directly relate NMR derived BVI and capillary pressure responses through the height of the measurement in a borehole. The derived height-based BVI transformation model is applied to the NMR log of the borehole to quantify non-producible water in the NMR log.
摘要:
A method for determining a characteristic of a subsurface geological formation enhances the vertical resolution of dual-detector measurements by utilizing a continuous calibration factor which is obtained from an environmentally compensated characteristic derived from at least two resolution-matched sensor signals, and from a resolution-matched sensor signal from the near-detector of the tool.
摘要:
A method and system for calculating extent of a formation treatment material in a formation. At least some of the illustrative embodiments are methods comprising releasing neutrons into a formation from a neutron source of a logging tool within a borehole having an axis, sensing energies of gammas produced by materials in the formation, the sensing by a gamma detector on the logging tool, generating a measured spectrum of the energies of the gammas sensed by the gamma detector, determining elemental concentrations of materials in the formation based on a basis spectrum, and calculating axial extent of a formation treatment material in the formation in relation to the axis of the borehole based on the elemental concentrations of at least some materials in the formation.
摘要:
A method for determining a characteristic of a subsurface geological formation enhances the vertical resolution of dual-detector measurements by utilizing a continuous calibration factor which is obtained from an environmentally compensated characteristic derived from at least two resolution-matched sensor signals, and from a resolution-matched sensor signal from the near-detector of the tool. This method also can enhance the statistical precision of the characteristic without degrading the vertical resolution.
摘要:
Determining elemental content of an earth formation. At least some of the illustrative embodiments are methods including: irradiating a portion of a formation that surrounds a borehole; counting gammas to obtain a spectrum of counted gammas; finding a solution to a system of equations based on the spectrum of counted gammas, which system of equations has a plurality of solutions, the solution being indicative of a plurality of weight percentages for a respective plurality of elements within the formation; determining whether the solution meets a predetermined constraint; repeating the finding and determining until a solution is found that is determined to meet the predetermined constraint; and producing an indication of the elemental content of the formation using the solution that meets the predetermined constraint.
摘要:
A nuclear logging tool calibration system and method. At least some of the illustrative embodiments are methods including placing a logging tool proximate to a volume to be tested (the logging tool comprising a neutron source and a gamma detector), accumulating a spectrum of gammas by the gamma detector (the gammas created responsive to neutron irradiation of the volume by the neutron source), and then adjusting gain of a photomultiplier tube of the gamma detector. The adjusting is responsive to count rate in an overflow bin of the spectrum, where the overflow bin accumulates count rate of gammas received by the gamma detector that have energy above a predetermined energy.
摘要:
A method and system for calculating extent of a formation treatment material in a formation. At least some of the illustrative embodiments are methods comprising releasing neutrons into a formation from a neutron source of a logging tool within a borehole having an axis, sensing energies of gammas produced by materials in the formation, the sensing by a gamma detector on the logging tool, generating a measured spectrum of the energies of the gammas sensed by the gamma detector, determining elemental concentrations of materials in the formation based on a basis spectrum, and calculating axial extent of a formation treatment material in the formation in relation to the axis of the borehole based on the elemental concentrations of at least some materials in the formation.
摘要:
A method and system for estimating native hydrocarbons from oil-based drilling muds with the aid of NMR data. Adaptive echo stacking may be used to balance between precision and sensitivity to changes in the fluid composition. Apparent T2 decay time and effective diffusion constants derived from the NMR data may be transformed into an indication of native hydrocarbon type, using known diffusion constants, fuzzy logic, and neural networks.
摘要:
A resonating electroplating anode electrode for electroplating the inside surfaces of steam generator tubing. The resonating electroplating anode electrode is formed from a plurality of tubular ceramic resonating material pieces glued to the inside and/or to one end of an anode tube to create a single resonating volume. In operation, an electrolyte solution is fed to the outside of the electrode in an annulus formed between the steam generator tube and the anode and returns through a hollow center in the anode. During use, the resonating materials resonate within the electrolyte solution during the electroplating process, thus creating an ultrasound enhanced-electroplating process. As a result, the resonating electroplating anode electrode and the resulting process reduce the amount of time required for electroplating, increase the production rate, reduce the residual internal stress resulting from electroplating, improves ductility and reduce brittleness of electrode-deposited nickel, produce a less porous deposited plating layer which improves corrosion resistance, and improve the uniformity of the electroplating coating grains. The resulting plated generator tubing is of superior quality and extended durability relative to currently known techniques.
摘要:
A method and apparatus for determining the presence of at least one naturally radioactive element in an earth formation surrounding a borehole, wherein, for each depth in the borehole, a spectrum is made of the gamma rays detected in several energy channels, and expressed as U=S Y, where "Y" is the elemental yields and "S" is a composite spectra matrix made of individual standard spectra characteristic of a given borehole environment; yields Y are then calculated. One thus determines a borehole correction factor from the general relationship between the borehole parameters, the standard spectra and the measured spectra. Finally, the yields are corrected for borehole effects by applying the correction factor.The correction factor is energy independent, at least for energies above a given threshold, and is also independent from the radioactive elements.