From Gas Well Testing Handbook
19.1 Introduction
Specific test data are required for each transient test analysis technique; adequate data are essential for satisfactory transient test results. Thus, an important part of preparation for a transient well test is deciding which data are needed and how they will be obtained. This chapter discusses the design of deliverability and transient tests and data required and describes characteristics of suitable equipment.1
19.2 Deliverability Tests
The accuracy of the results calculated depends on the accuracy of data used. Obtaining accurate field data can be accomplished only if the field personnel follow established procedures for data collection. Detailed procedures can be found in Refs. 1 3. Brief procedures are summarized below.
Equipment and Procedure for Field Tests
The wells were shut in preparatory to running the initial drawdown test. In Appendix D, Figure D 1 shows the equipment used for these tests. A bottomhole pressure bomb recorded bottom-hole pressures. A dead-weight tester periodically measured surface pressures. For all tests, the bomb was lowered on a wire line to the same pressure datum.
The initial flow rate was selected with the aid of well capacity information made available from the AOF data, considering that two or three added flow rates were to be used within the span of the well s indicated capacity. Once the rate was selected, the pressure controller was set to provide a constant pressure downstream of the choke, thus maintaining a constant rate throughout the test. The specific rate was obtained by using the appropriate orifice plate...
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Example A 1 Converting Metric to English Gas Field Units Equation A 1 describes the gradual decline in flowing bottom-hole pressure (atmospheres) in a gas or water well as related to time in...
Symbol Description A Drainage area A ? Drainage area constant AOF Absolute open flow potential of a well or the deliverability zero sandface pressure b...
1.3 Transient Well Testing Detailed reservoir information is essential to the petroleum engineer in order to analyze the current behavior and future performance of the reservoir. Pressure transient...
5.1 Introduction Important reservoir parameters can be determined by flowing a well at a constant rate and measuring flowing wellbore pressure as a function of time. This is called drawdown testing...
Symbol Description Field units Metric (SI)units A Drainage area ft 2 m A Gross cross-sectional area a Coefficient...
