By Fikri Kuchuk, Florian Hollaender and Mustafa Onur (Eds.)
This reference provides a complete description of move via porous media and recommendations to strain diffusion difficulties in homogenous, layered, and heterogeneous reservoirs. It covers the basics of interpretation strategies for formation tester strain gradients, and pretests, multiprobe and packer strain brief assessments, together with spinoff, convolution, and pressure-rate and pressure-pressure deconvolution. Emphasis is put on the greatest chance process that allows one to estimate errors variances in strain info besides the unknown formation parameters.Serves as a coaching handbook for geologists, petrophysicists, and reservoir engineers on formation and strain brief testingOffers interpretation recommendations for fast program within the fieldProvides unique insurance of pretests, multiprobe and packer strain temporary checks, together with spinoff, convolution, and pressure-rate and pressure-pressure deconvolution
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Extra info for Pressure Transient Formation and Well Testing
It should also be pointed out that during the production profiling the flowing wellbore pressure was not measured at a stationary point in the wellbore. After a total of 6-hr production, the PLT was stationed at the same location as the first drawdown and acquired wellbore pressure about 30 minutes before the start of the buildup. 17, due to the rate change during the second drawdown. 16. 17. 06 psi for the buildup. 01 psi, although it could have changed with time for some of the sensors. The difference in spread of pressure measurements for the drawdown test and the subsequent buildup must be due to external noise.
Therefore, when the production or injection rate is changed from a nonzero value to a different value, including from zero to another value or from a nonzero value to zero at a well, it creates pressure diffusion in the reservoir; monitoring and measuring the diffusion at any point in the system is called pressure transient testing. Thus, depending on the disturbance, sink or source type, well tests are also divided as: (1) Production test and (2) Injection test. If the production or injection rate is changed to zero from a nonzero value, the production test is called a buildup test and the injection test is called falloff.
All these process are hydraulically controlled from the surface. Unlike formation testers, with one downhole trip per test, the repeat formation testers can successively test a number of zones in a single downhole trip without bringing the tool to surface. 11 Seal valve (to upper sample chamber) Schematic of a repeat formation tester, after Schultz et al. (1975). 12 The front view of a single probe and packer element (a) and in a set position against the formation (b), after Akkurt et al. (2007).