Pressure-Pressure Deconvolution Analysis of Multiwell Interference and Interval Pressure Transient Tests

Following the introduction of pressure-rate (p-r) deconvolution techniques in 1960s, they have been investigated continually<br>during the last two decades. Now most p-r deconvolution techniques are stable and have been used increasingly for analysis<br>of pressure transient tests. A successful p-r deconvolution can transform a multirate pressure transient response to an<br>equivalent constant-rate drawdown response for the entire test duration. It can help identify/confirm interpreted reservoir<br>models and eliminates multirate superposition effects. However, the flow rate is usually not directly and continuously<br>measured in conventional pressure-transient well tests, although it is measured reasonably accurately during interval pressure<br>transient tests (IPTT) conducted by wireline formation testers (WFTs). Nevertheless, large uncertainties or errors associated<br>with inaccurate rate data usually hinder the successful use of p-r deconvolution methods.