Some experiment results of two solids displace the couple relationship of waves that propagate in two solids, and it is clear to measure the original formation velocities by sonic logging.
A four-parameter invaded transitional zone model is established, and in the model, formation is radially divided into four parts of borehole, flushed zone, transitional zone and original formation. The linear variation of the resistivity of the transitional zone realistically describes invasion process.
Four parameters (the resistivity of original formation, resistivity of transitional zone, the radius of flushed zone and the radius of transitional zone) are inverted by using modified damped least square method.
By using the information provided by MDT logging data, the formation pressure may be effectively acquired, fluid properties exactly determined, original formation permeability calculated, and fluid flowing situation studied.
when the invasion depth is shallower, the apparent resistivity mainly reflects the resistivity of original formation and the resistivity of invaded zone when the invasion depth is deeper;
Microscopically, clastic rocks have dual-pore structures, i.e. artesian pore throat system with the occurrence of liquid hydrocarbons and stagnant pore throat system saturated with original formation water.
(2) A great deal of water produced by TSR makes the original formation water in the gas reservoir diluted, so that the salinity of formation water is reduced correspondingly;
Microscopically, clastic rocks have dual-pore structures, i.e. artesian pore throat system with the occurrence of liquid hydrocarbons and stagnant pore throat system saturated with original formation water.
(2) A great deal of water produced by TSR makes the original formation water in the gas reservoir diluted, so that the salinity of formation water is reduced correspondingly;
Ban 876 underground gas storage is an extension project of Dazhangtuo gas storage and it is located in Ban Ⅱ 1 depleted condensate reservoir with extra low formation pressure. The burial depths of the reservoir are 2 220~2 249 m and it is of 22.5 MPa original formation pressure,10.59 MPa present formation pressure and 0.476 formation pressure coefficient.
The advantage of the RCQS as fracturing proppant is manifected by different postfracture responces of a well of depth 3750 m,formation temperature 130℃,and original formation pressure coefficient 1.8:0.544 m~3 of propping sand was produced in the course of oil recovery from the well newly drilled and fractured with standard haydite in 1987;
They showed the original formation of regularly spaced ribs corresponding to tearing of a homogeneous oriented material for the non fibrillable fibres.
A primary factor appears to be changes in climate since original formation of these peatlands, particularly in recent times.
An explanation is offered in terms of the recrystallization of cilia which are attached to the shish-kebab core but are solvated at the original formation temperature.
The third and fourth sternebrae had latitudinal (right-left) bifid ossification centers, undoubtedly a result of the original formation of the sternum from two longitudinal mesenchymal anlagen.
Molybdenite, in contrast, provides a robust Re-Os chronometer, retaining its original formation age of ~2780 Ma, despite subsequent metamorphic disturbances in Archean and Proterozoic time.
Low permeability gas reservoir has very different characteristics from conv- entional ones.There are two special features:the highly tortuous flow path in the small pores in the reservoir formation and the dependency of flow parameters (K,μ,φ,c_g etc) of the porous medium on pressure.These will bring a com- plication for designing and analyzing of DST.If traditional methods are used, it would not give effective results.This paper suggests a special program for DST in low permeability gas reservoir both in theory...
Low permeability gas reservoir has very different characteristics from conv- entional ones.There are two special features:the highly tortuous flow path in the small pores in the reservoir formation and the dependency of flow parameters (K,μ,φ,c_g etc) of the porous medium on pressure.These will bring a com- plication for designing and analyzing of DST.If traditional methods are used, it would not give effective results.This paper suggests a special program for DST in low permeability gas reservoir both in theory and practice.Certainly, it would improve the formation evaluation at the exploration stage.It includes restoring original formation properties with small pressure difference and slow flow,and introducing linear transformation function,to eliminate some parame- ters with strong dependency on pressure.
RFT logging is a method of formation test in Schlumberger Company. It takes point—test way to interpretate original formation pressure, permeability and pore fluid properties. Along with utilising 1990's RFT logging—data of north—western margin, Junggar Basin, this paper suggestes specific methods in reservoir evaluation and solution of geological problems by means of employing RFT logging information. Through production test, the results are satisfied. Some views are also provided on applicability conditions...
RFT logging is a method of formation test in Schlumberger Company. It takes point—test way to interpretate original formation pressure, permeability and pore fluid properties. Along with utilising 1990's RFT logging—data of north—western margin, Junggar Basin, this paper suggestes specific methods in reservoir evaluation and solution of geological problems by means of employing RFT logging information. Through production test, the results are satisfied. Some views are also provided on applicability conditions of RFT logging in the paper.
We always loss the chance to obtain the original formation pressure in the gas pool which has a very high original formation pressure, because of strong blow-out happening in a wildcat well, or the well not promised to shut in for measuring the pressure because of the problem of wellhead equipment, for this, this paper presents a simple and convenient method which can be used to reversedly calculate the original formation pressure, only to get more than two of formation pressures and...
We always loss the chance to obtain the original formation pressure in the gas pool which has a very high original formation pressure, because of strong blow-out happening in a wildcat well, or the well not promised to shut in for measuring the pressure because of the problem of wellhead equipment, for this, this paper presents a simple and convenient method which can be used to reversedly calculate the original formation pressure, only to get more than two of formation pressures and accumulation production data in producing test.