The casing wave and formation compressional wave can be differentiated by the waveform difference between open hole and cased hole,and the formation compressional wave can be extracted by a STC(slowness-time coherence) method.
According to above-mentioned new testing idea, this text propose that put store layers influent, well pipeline and pipe mechanics etc together and consider wholly as one, regarding the stability of layer wall, coming out sand of layer, destruction of oil tube and casing pipe and the formation of hydrate in well pipe etc as restraint condition of rational work parameter.
What natural gamma well logging measured is total natural gamma radioactivity in layer,and it is a kind of most basic method in casing pipe well logging.
The transmission-line theory was used to analyze the electric current distributions in domains of the in-borehole, casing pipe and out-of-casing cement sheath, when the casing pipe was energized by large current supply.
The casing wave and formation compressional wave can be differentiated by the waveform difference between open hole and cased hole,and the formation compressional wave can be extracted by a STC(slowness-time coherence) method.
A wave impedance inversion method and practical image examples of the medium in the annulus space between the casing and the formation utilizing reflected ultrasonic waves
The casing wave and formation compressional wave can be differentiated by the waveform difference between open hole and cased hole,and the formation compressional wave can be extracted by a STC(slowness-time coherence) method.
To estimate casing thickness with litho-density logging in cased hole,the ratio of low energy counts NS to high energy counts NH in γ spectrum and the relationships between the ratio and photoelectric absorption coefficient Pe as well as casing thickness HC in different mineral compositions are calculated with Monte Carlo program MCNP.
An instrument has been developed for measuring the transient characteristics and parameters of fast diode structures on a semiconductor wafer, on individual chips, and after their mounting in a casing.
The specific feature of the problem formulation is that the blade channels and the channel between the impeller and the pump casing (the open diffuser) are considered as a single acoustic system.
The vortex-induced vibration equation of a casing pipe was set up considering the beam mode and Morison's nonlinear fluid loads as well as the vortex-excited loads.
The results show that the dynamics response of casing pipe obviously increases, and the complicated response behaviors of casing pipe are described under combined wavecurrent.
The results of analyzing the experience from the recovery heat treatment (RHT) of the casing parts (HPCs, stop valves) of PT-60-12.8 and T-100-12.8 turbines, which was performed under factory conditions, is presented.
When measurements are performed in high speed, small-scale compressors, the use of curved glass windows is required in order to avoid any mismatch between the measurement window and the casing.
The pressure field on the casing wall and the velocity fields at the rotor inlet and outlet were measured under rotating stall condition with a fast response pressure transducer and a single slant hot-wire probe, respectively.
Considering the practical application a new type of micro injector was designed and described in this paper, which was imbedded in the casing and could be moved along the chord.
套管
casing 
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