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Download Gaswell Testing: Theory, Practice & Regulation by David A.T. Donohue PDF

By David A.T. Donohue

Introduction 1 1. traditional & Isochronal exams five 1. 1 Derivation of primary circulation Equation 6 1. 2 traditional try 10 1. three Isochronal try out thirteen 1. four converted Isochronal attempt 17 2. extra checking out suggestions 23 2. 1 Pseudopressure (Real gasoline power) remedy for gasoline movement 24 2. 2 The Radial Diffusivity Equation for fuel move 31 2. three Analytical resolution of the Diffusivity Equation 33 2. four movement Regimes 34 2. five pores and skin issue 36 2. 6 Turbulent circulate issue forty 2. 7 Drawdown or Falloff try forty-one 2. eight Buildup try out forty three 2. nine choice of S, S' and zero from Buildup and Drawdown assessments forty seven fifty three three. extra checking out concerns three. 1 Surface-Pressure Relationships fifty four Stabilization Time and Radius of research sixty two three. 2 number of stream charges and length of stream premiums sixty four three. three three. four good bore garage results sixty five three. five creation of beverages sixty six three. 6 Single-Point try sixty eight three. 7 The Orifice Meter sixty eight three. eight trying out apparatus seventy four seventy six three. nine dimension, Sampling, and protection in trying out eighty one four. methods & rules four. 1 Interstate Oil Compact fee methods eighty three four. 2 nation of Texas rules ninety nine four. three country of Oklahoma rules 102 four. four nation of latest Mexico laws 109 four. five nation of Louisiana laws 123 four. 6 Province of Alberta laws 124 vi Gaswell trying out five. box try & Interpretation 127 6.

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38) slope, (psia)2/cycle. Additional Testing Options 45 + A PIot 0 f Pw2 (or p) versus Iog tp ~t ~t . 7. 39) it will give a positive value for permeability. For an infinite shut-in time, ~too, the value of + ~ ~tx, ~t is equal to one. Practically, this corresponds to zero pressure drop as ~t goes to infinity. This simply means that by extrapolating the straight line of the buildup data to tp + ~t = 1, we should get the static reservoir ~t pressure for an infinite reservoir. 7. 7 Semi-log Plot of Buildup Data.

The solution of the diffusivity equation derived in the previous section should describe the pressure at any point in the radial flow system as a function of time. This equation has no known analytical solution because it is nonlinear. However, an approximate solution is derived in Appendix B for certain boundary and initial conditions. The approximate solution developed there is for a single well located at the center of a circular reservoir of infinite radial extent. 4 Flow Regimes 34 Gaswell Testing PR - Pwf 2 gas viscosity at average pressure p, cp gas compressibility factor at average pressure p reservoir temperature, oR permeability, md formation thickness, ft gas compressibility, psi -1 or 1/p porosity, fraction well radius, ft time, hrs production rate, MSCF/O Several testing procedures and analysis techniques have been developed to examine the pressure distribution with time in the flow system, and, more important, to gather valuable information on near wellbore and/or reservoir characteristics.

This is achieved by shutting in the well and allowing it to reach a stabilized pressure. This pressure is assumed to be equal to the static reservoir pressure. 7 Drawdown Or Falloff Test Additional Testing Options 41 constant rate. The flowing bottomhole pressures are measured and recorded as a function of time during this flow period. Falloff tests are carried out on injection wells. The falloff in bottomhole pressure is recorded after injection is terminated. If we take a closer look at our generalized solution, eq uation (2.

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