Over the past 20 years the industry has focused on drilling and completing horizontal producing wells, in order to develop better deliverability and better UER across the reservoir. The past 10 years igniting the unconventional reservoirs across the US the majority of wells drilled and completed are horizontal wells. These types of wells are traditionally drilled with various inclinations, trajectories which porpoise across the reservoir interval. Horizontal lateral sections consist of numerous selectively stimulated stages containing greater than 20 stages spread out across 2,000 ft to 15,000 ft of horizontal interval.
In order to understand how a producing horizontal lateral section contributes, is to deploy production log technology across the lateral while the well is flowing back. The production log system & survey is the only direct method to measure the performance of the well, how each stage and perforation cluster contributes, oil, water and gas. The production log tool comprises of various measurements such as fluid capacitance, fluid density, holdup, which measures the oil, water gas content, cross sectional holdup and velocity as fluids enter the lateral section.
The production log system can be deployed with two separate methods, coiled tubing deployment or wireline with a well tractor situated on top of the production log tool string. It is highly recommended that the production log survey be performed using a procedure and program created by an experience specialist production logging personnel. This will increase the probability the service will deliver a representative result & value to the oil company. However, whether by customer decisions, inadequate service company knowledge, lack of experience in how the tools and deployment methods should be run & how the well should be performing during the survey; the production log surveys, at time may not deliver a quality product. A full service production log service including deployment, the price point offering is ~ $100,000 to > $1,000,000. A slip up in service quality leads to the service not being performed in the future or leaves a negative view on the service over all.
This paper will discuss the benefits pit falls of horizontal production log survey application, deployment & acquiring quality results. The paper will show case examples of productions logs run with various deployment methods & identify benefits and issues during the survey. This paper will present a best practices novel procedural flow-chart for the industry to follow, that can assist and help production logging, wireline, tractor, coiled tubing deployment service companies, and the oil company engineering group to execute properly a quality production log service survey.