PetroPulse Insights

   Gas-Lift Troubleshooting: How to Diagnose Well Issues Before Calling a Rig Gas-lift problems are usually associated with three areas: inlet, outlet, and downhole (Fig. 1). Examples of inlet problems may be the input choke sized too large or too small, fluctuating line pressure, plugged choke, etc. Outlet problems could be high backpressure because of a flowline choke, a closed or partially closed wing or master valve, or a plugged flowline. Downhole problems could include a cutout valve, restrictions in the tubing string, or sand-covered perforations. Further examples of each problem area are included in this handbook. Often the problem can be found Fig. 1: The Gas-Lift System on the surface. If nothing is found on the surface, a check can then be made to determine whether the downhole problems are wellbore problems or equipment problems. Inlet Problems Choke sized too...

Unlocking Reservoir Insights: Permeability Estimation from Inflow Performance Relationship (IPR) Permeability Estimation From Inflow Data During Underbalanced Drilling Abstract Underbalanced drilling has become increasingly popular as it reduces formation damage caused by fluid invasion during drilling operations. This is particularly important in the case of depleted reservoirs or when horizontal and deviated wells are drilled with long exposure time. As a result of the lower pressure in the wellbore, there is an inflow from the reservoir into the wellbore, which is continuously measured at the wellhead. This inflow carries information about the reservoir. The objective of this paper is to develop a mathematical model and its associated interpretation methods to estimate reservoir permeability and its variation along the length of a horizontal wellbore using the inflow measurements at the wellhead. The traditional methods of pressu...

Unveiling the Secrets Below: A Guide to Well Logging Unveiling the Secrets Below: A Guide to Well Logging Introduction Well logging is a critical aspect of the oil and gas industry, providing essential data for understanding subsurface formations and evaluating reservoir potential. By utilizing specialized tools, geologists and engineers can gather valuable information about rock types, fluid content, and reservoir properties. Types of Well Logs Gamma Ray (GR) Logs: Measure natural radioactivity emitted by rocks. Shales typically exhibit higher radioactivity than sandstones, making GR logs useful for distinguishing between these rock types. Spontaneous Potential (SP) Logs: Measure the electrical potential difference between drilling fluid and formation water. This data can help identify permeable zones, such as sandstones, which tend to generate more electricity. Resistivity Logs: Determine the electrical conductivity of rocks. Since formation water is generally more conductive than...