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- W2376718305 abstract "Based on the fundamental principle of formation testing while drilling(FTWD) and filtration theory,we built the pressure diffusion differential equation between pressure decline and pressure buildup in the cylindrical coordinate,and determined the definite solutions problem of FTWD.After homogenizing the boundary of definite solutions problem,the finite difference approach was adopted to establish the explicit difference equation under four-dimensional space and the analytic and finite difference methods were used to analyze homogeneous and spherical filtration problem in the condition of point source,single phase,single testing room.The calculation error of the two methods is less than 2.00%,indicating the validity of the finite difference method.With finite difference approach the influences of following factors on the response of different permeability(0.l×10~(-3)μm~2,1.0×10~(-3)μm~2 and 10.0×10~(-3)μm~2) formation were quantitatively analyzed,including,skin effect,storage effect,formation heterogeneity,suction rate and suction probe radius.The analysis indicated that the impact of these factors on the pressure response curve is significant,which mainly manifested in the following respects,such as suction pressure drop,pressure drop rate,rate of pressure recovery,build-up time.And the sensitive degree of different permeability formation differs significantly.We established a formation pressure test simulation experiment platform to stimulate pressure suction testing in three different permeability(108.81 × 10~(-3) μm~2,16.10 × 10~(-3) μm~2 and 4.79 × 10~(-3) μm~2)formations and adopted finite difference approach to carry out numerical simulation for the experiment.The result shows that numerical simulation and the measured pressure response are consistent.The absolute error is less than 1.60 MPa and the relative error less than 5.00%(maximum error is 4.92%).The correctness and accuracy of the finite difference numerical method were confirmed." @default.
- W2376718305 created "2016-06-24" @default.
- W2376718305 creator A5027311139 @default.
- W2376718305 date "2014-01-01" @default.
- W2376718305 modified "2023-09-23" @default.
- W2376718305 title "Mathematical model and physical experimental research for pressure response of formation testing while drilling" @default.
- W2376718305 hasPublicationYear "2014" @default.
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