摘要:
In situ measurement of the gas content of formation fluid using thermal expansion principles. The formation fluid from a wellbore source is passed through an expansion type valve into a test chamber. The temperature and pressure are measured upstream and downstream of the valve. The difference in the temperature measurement is an indicator of gas content in the formation fluid. Samples of the formation fluid can be taken on favorable indicators.
摘要:
A system for measuring the thermal neutron lifetime of earth formations in the vicinity of a well borehole is disclosed. A downhole sonde is equipped with a pulsed neutron source, a thermal neutron or gamma ray detector and a pair of measurement electrodes. The measured salinity of the borehole fluid is used to optimize the delay time to the opening of measurement gating intervals for signals from the detector.
摘要:
Methods are provided for identifying the location and height of induced subterranean formation fractures and the presence of any associated frac-pack or gravel pack material in the vicinity of the borehole using pulsed neutron capture (PNC) logging tools. The proppant/sand used in the fracturing and packing processes is tagged with a thermal neutron absorbing material. When proppant is present, increases in detected PNC formation and/or borehole component cross-sections, combined with decreases in measured count rates, are used to determine the location of the formation fractures and the presence and percent fill of pack material in the borehole region. Changes in measured formation cross-sections relative to changes in other PNC parameters provide a relative indication of the proppant in fractures compared to that in the borehole region.
摘要:
Reservoir characterization based on observations of displacements at the earth's surface. One method of characterizing a reservoir includes the steps of: detecting a response of the reservoir to a stimulus, the stimulus causing a pressure change in the reservoir; and determining a characteristic of the reservoir from the response to the stimulus. The response may be the pressure change which varies periodically over time, or a set of displacements of a surface of the earth. In another example, a method includes the steps of: detecting a set of displacements of the earth's surface corresponding to a pressure change in the reservoir; and determining a characteristic of the reservoir from the surface displacements. In yet another example, a method includes the steps of: detecting a set of displacements of the earth's surface corresponding to a change in volume of the reservoir; and determining a characteristic of the reservoir from the surface displacements.
摘要:
A method for determining the location and height of a fracture in a subterranean formation using a neutron emitting logging tool. The method includes obtaining a pre-fracture data set, fracturing the formation with a slurry that includes a proppant doped with a high thermal neutron capture cross-section material, obtaining a post-fracture data set, comparing the pre-fracture data set and the post-fracture data set to determine the location of the proppant, and correlating the location of the proppant to a depth measurement of the borehole to determine the location and height of the fracture. Using a pulsed neutron capture tool, it is also possible to determine whether the proppant is located in the fracture, in the borehole adjacent to the fracture, or in both. The method may also include a plurality of post-fracture logging procedures used to determine various fracture and production characteristics in the formation.
摘要:
A cavitation device is used to heat and facilitation the separation of mixtures and emulsions of oil and water. Waste heat from the power source for the cavitation device may be utilized to elevate the temperature of incoming mixtures or emulsions. The heated mixture of emulsion is sent to a separation vessel where vapor may be removed and/or recovered, and where oil is removed as it separates into an identifiable layer. The separation vessel may be a flash tank.
摘要:
A system and method of drilling and/or perforating uses a laser beam to remove material, such as to perforate the casing, cement and formation or drill a well bore. The system and method can further or alternately encompass material analysis that can be performed without removing the material from the well bore. The analysis can be performed apart from or in connection with drilling operations and/or perforating the casing, cement and formation. The analysis can be used in a feed back loop to adjust material removal, adjust material analysis, determine the location of future material removal, and for other uses.
摘要:
A method of radioactive well logging for use in well operations wherein hydraulic fracturing material, including radioactive isotopes, is injected from a steel-cased well bore 31 into surrounding earth formations 33. Low energy gamma ray emitting radioisotopes are selected for tagging the liquids phase of the fracturing material and high energy gamma ray emitting radioisotopes are selected for tagging the solids phase. The relative amount of low energy radioisotope material inside the well bore 31 relative to the amount outside the casing 35 is determined to minimize the interfering effects of borehole tracers in determining concentrations of the high energy tracers in the formations. The procedure includes detecting the intensity of gamma radiation from the tracers in the borehole and surrounding formations by a detector 38 in the borehole in proximity to the injection zones and obtaining data representative of the radiation intensity. The intensity data is then separated into an observed energy spectrum from which is obtained observed energy spectrum count rates of gamma radiation in an energy region associated with gamma radiation emitted by the low energy tracer material in at least two relatively low energy ranges, a first P of which is highly sensitive to photoelectric attenuation by iron in the well casing and a second M of which is a higher energy range primarily sensitive to Compton scattered gamma rays and much less sensitive to photoelectric absorption by iron.These count rates are then combined to obtain an observed photoelectric ratio, R.sub.p =(M/P), of the low energy tracer. Count rates of radiation are then obtained in all the energy ranges associated with gamma radiation emitted by the low energy tracer to obtain the total elemental concentration of the low energy tracer in the borehole and the formations. The amount of the low energy tracer in the borehole Tr(Bor) relative to the amount of said low energy tracer outside the casing is determined by a relation involving the observed photoelectric ratio Ph Tr(Obs) of low energy tracer, the total observed concentration of the low energy tracer Tr(Tot), and the low energy photoelectric ratios, Ph Tr(Bor) and Ph Tr(For), calibrated for the tracer in the borehole and in the formation, respectively.
摘要:
Uranium ore zones are quantitatively evaluated using the relative photoelectric absorption of naturally occurring gamma rays in two energy bands. One band experiences significant photoelectric absorption from uranium; the other does not. The ratio of the resultant measurements provides a quantitative indication of the uranium concentration.
摘要:
A method is disclosed for the simultaneous determination of borehole (11) and earth formation (20) thermal neutron decay time components. The method, which employs pulsed high energy neutron sources (21) and time gated detectors (23,24), furnishes several quality indicators, along with appropriate criteria for selecting which to use. The method also furnishes a new indicator for the borehole capture cross section.