... is often buried below a layer of gypsum, so many wells are drilled with oil-based mud ensuring borehole stability. It leaves no choice of resistivity logging other than the array induction tool. However, the SNR of raw conductivity signals under such background is very low with negative value exist...

... resistivity tool. The higher frequencies were carefully chosen to improve the measurability of the quantities. A detailed modeling study was performed to investigate the tool characteristics including (1) depth of investigation, (2) vertical resolution, (3) sensitivity to resistivity anisotropy, (4) borehole...

... upstream oil & gas germany government artificial intelligence shale sequence diffusion borehole diffusivity mudstone th annual logging symposium shale tortuosity shale-hosted nuclear repository SPWLA 64th Annual Logging Symposium, June 10-14, 2023 DOI: 10.30632/SPWLA-2023-0006...

... ABSTRACT In slow formation borehole acoustic Wireline Logging (WL) and Logging While Drilling (LWD) it is common to obtain formation shear slowness from the dispersive borehole guided flexural and quadrupole wave, respectively. Due to poor signal to noise ratio (predominantly LWD) and/or tool...

... ABSTRACT The single borehole reflection imaging method (SBRI) has increasingly played an effective role in the reservoir evaluation and identification. The SBRI method can image the distribution of the fractures and the vugs around borehole with the reflection waves extracted from the array...

... drilling fluid chemistry drilling fluid selection and formulation machine learning well logging formation damage drilling fluids and materials fluid loss control simulation porosity water saturation spwla 63 drilling fluid property upstream oil & gas borehole log analysis...

... porosity and Dean-Stark saturations), and the other using an equivalent log interpretation of thick reservoir intervals from oil-based mud (OBM) wells. Simulated borehole-resistivity are compared to field logs after each validation loop against rock property models. The new inversion-based workflow...

... Abstract Resistivity and acoustic near-wellbore characterization techniques are increasingly used to provide structural definition and fractures identification. The two log types are complementary, often showing ability to compensate for borehole conditions and lithology uncertainty. Image...

.... well logging trajectory design reservoir characterization directional drilling constraint stratigraphic correlation well planning upstream oil & gas correlation borehole interpretation interface information pilot well spwla-2022-0076 rd annual logging symposium pilot hole inversion...

... seeds for simultaneous inversion on models of varying complexity. The fast inversion algorithm generates formation resistivity profile above and below the borehole. As resistivity is related to lithology and fluid types, a geosteering engineer can intuitively carry out quantitative steering task...

...-resolution ultrasonic pitch-catch P&S slowness and high-definition ultrasonic pulse-echo images. production control log analysis drilling measurement well logging production monitoring reservoir surveillance upstream oil & gas lwd borehole pseudo-rayleigh mode slowness ultrasonic...

... Abstract Advanced logging-while-drilling (LWD) ultrasonic images provide 0.2 in. resolution, the highest possible resolution for well logs, enabling detailed reservoir characterization at the borehole wall of key geological events. In this paper, we demonstrate how this plethora of information...

... based pseudo-FK: The formation compressional arrivals can then be isolated in the receiver wavefields. With knowledge of the tool and borehole geometry, the through casing formation compressional can then be estimated. We demonstrate that in cased wellbores acoustic slowness can still be derived where...

... Cased-hole acoustic-wave modeling using the slip- an important subject in borehole acoustics (Tang and interface theory is applied to cement bond evaluation, Cheng, 2004). In the traditional cased-borehole allowing for characterizing various bonding issues acoustic-wave modeling (Tubman et al., 1984...

... methodology. A correlation between the two is established, enabling an intrinsic C/O log output. Eleven laboratory physical tests and 120 Monte Carlo simulated case studies are conducted. Systems investigated include sandstone and limestone with different porosities and fluid saturations. Borehole sizes...

... reservoir characterization drilling data acquisition drilling fluids and materials drilling measurement well logging production control log analysis borehole imaging wellbore seismic acoustic amplitude image geological interpretation application morris sedimentary feature borehole...

... in porous media drilling operation continuity porosity drilling measurement well logging reservoir characterization drilling data acquisition logging while drilling directional drilling fluid dynamics borehole lwd structural geology structural model receiver production monitoring reservoir...

... by the presence of multiple casing strings and completion hardware in the borehole, with variable annular and near-wellbore fluids. Every measurement is used and interpreted in relation to its statistical uncertainty and level of interpretability. In a complex scenario, near-wellbore conditions and well dynamics...

... of chlorine and would be a natural fit for measuring chlorine concentration, if not for the fact that the spectrum contains chlorine gamma rays from both the formation and borehole. The borehole chlorine background can be large and is highly variable from well to well and along depth. Historical efforts...

... stick/slip of wireline toolstrings causes replication of high-resolution subsurface data and small intervals are missed entirely, resulting in a mismatch between actual and recorded depth intervals. The resulting degradation of array sonic measurements and borehole image quality is not recoverable...