... flow period pressure response pressure drop typical curve reservoir analysis method skin effect wellbore storage dual-porosity behavior equation mathematical model THE PETROLEUM SOCIETY PAPER 98-20 Analysis Method of Well Test for Horizontal Well in Naturally Fractured Reservoirs With Dual...

... derivative indicating partial completion effects even if the well is perforated in all fractured layers. During a buildup this recognition is more difficult because the shape of the buildup curve is affected by the length of the flow period previous to shutin. Introduction Outcrop information, imaging...

... Abstract By the transient pressure for horizontal well with constant flow rate and Duhamel's principle, this paper presents the method to calculate the transient pressure for DST flow period or slug flow of horizontal well, pressure analysis method of DST flow period or Slug period...

... and accuracy of DST analysis. Introduction A typical open hole DST consists of a 5–10 minute initial flow period, 60–90 minute initial shut-in period, and one hour main flow period and a two to four hour final shut-in period. The intent of the initial flow is to relieve the mud hydrostatic pressure...

... Introduction The two-cycle drill stem test, consisting of an initial flow period, an initial shut-in period, a second flow period and a second shut-in period, remains the most common type of test run in the field. Unfortunately, the most widely used method of analyzing data for these tests can...

... interpretation techniques is investigated. Currently, it is claimed that a plot of pressure versus log (time) displays an early- and a late-time straight time. It has also been assumed that there is a spherical flow period between the early-time and late-time radial flow regimes. This investigation shows...

... Abstract If the duration of the flow period preceding a buildup test is not sufficiently long an apparent semi-log straight line may still be seen both on a type curve match and a Horner plot. The analysis of this semi-log straight line results in the wrong value of permeability...

... JOURNALS IF FILED IN WRITING WITH THE TECHNICAL PROGRAM CHAIRMAN PRIOR TO THE CONCLUSION OF THE MEETING. ABSTRACT Pressure build up and drawdown analysis applied to D. S. T. shut-in and flow periods is reviewed. A description of D. S. T. periods and their in- fluence on pressure behavoir is made. The flow...

... method provides for optimization of the test design from initial observations of pressure and fluid influx. It also minimizes hazards to both man and the environment. Because of the advantages of the closed-chamber test procedure, it is recommended that, whenever possible, the initial flow period of all...