Mature Fields

Case Study: Operator Successfully Runs 5 ¾-inch Slim-Hole Drilling Operation with Geo-Pilot® RSS System

Innovative solution drills one of the longest slim sections (5,500 feet) on Norwegian Continental Shelf CHALLENGE – In the previous operation of this ERD well, an expandable liner had been set to address formation instability. This expandable liner created a challenge, since the liner’s internal diameter was only 5.795 inches, which is extremely narrow. The wellbore’s narrow opening required a slim-version drill bit...

Tech Paper: Modeling Flow Profiles Using Production Log Temperature Data in Single and Multiphase Wells

Real-time multiphase flow monitoring proves valuable This paper presents the application of a method to determine a generalized wellbore-flow profile using predominantly fluid temperature data obtained through a platinum-resistance thermometer (PRT) tool. The method is advantageous, enabling the calculation of multiphase rates independently of spinner data, and it is based almost solely on temperature measurements, which are reliable and available with every production-logging...

Tech Paper: The Radial Approach to Safety Factors for Tubular Design

New radial safety factor can help assist well engineers with safer and more straightforward tubular design. Traditionally, collapse safety factor (SF) is the ratio of tubular collapse resistance to collapse load. The collapse resistance is usually calculated using formulas suggested in API 5C3 or ISO 10400. If the collapse load is very small while the tension stress and/or internal pressure are high, the...

Keeping mature fields economically viable

Understanding current field and well production to help extend the life of a mature asset Mature fields provide about 70 percent of today’s global hydrocarbon production, yet we extract only about 35 percent of what we find. That means that for every 100 barrels we discover, we’re leaving 65 in the ground. An improvement in recovery of just one percent would deliver the...

Tech Paper: Study of Multilateral-Well-Construction Reliability

Examining 22 years of actual multilateral-well applications to determine true reliability Multilaterals are often cited as technology that can be implemented to maximize reservoir-recovery rates. However, few operators have been willing to put multilaterals into practice. The most frequently cited reason for not considering multilaterals is risk. Without access to data to show otherwise, it is difficult to overcome this industry perception of...

Case Study: Operator Saves USD 7.2 Million with Improved Drilling Performance and Sets New Field Benchmark

DES helps operator reduce drilling with potential savings of USD 115 million across field CHALLENGE – These shallow-water wells were typically drilled in about 93–105 days because of many factors, such as trajectory management, bit selection, limited hole cleaning, and bit hydraulic power design. Thus, the rate of penetration (ROP) and the additional time spent for hole cleaning were not optimal. To keep...

Mature Field Rejuvenation with Top Hole Re-completion –Using Cement Packers

Accessing bypassed oil to capture bypassed cash-flow The oil and gas industry has been hard-hit by the economic downturn. We find ourselves dealing with an unprecedented situation: most financing channels are at punitive rates, and the equity capital markets are an option only for a select few. With oil prices only slowly recovering, there is an industrywide sense of urgency to identify ways...

Tech Paper: Nonexplosive Tubing Perforator Offers Controlled Cost-Effective Solution for Through-Tubing Gas Lift Installation

User friendly mechanical perforator eliminates need for explosives, helping to improve safety and reduce rig time An operator in Baku, Azerbaijan was planning to create a gas lift configuration and needed to perforate 7-in., 32-lbf, 13% chrome, up to 0.51-in.wall thickness, heavy wall tubing without explosives. A nonexplosive mechanical tubing perforator conveyed on electric line avoided damaging the in-situ control lines and the...

Tech Paper: Size Degradation Studies of Lost Circulation Materials in a Flow Loop

When drilling problem zones in mature fields, it is important to use resilient lost circulation materials Recently, there has been significant interest in understanding the material properties of lost circulation materials (LCM), including size degradation studies from mechanical compression tests and from shear flow. These types of tests are currently of particular importance because of increased drilling activity in mature fields, which often require...

Case Study: Illusion® Frac Plug Helps Eliminate High-Risk Millout Operations

Operator removes risk of intervening in a depleted wellbore when milling out composite plugs CHALLENGE – For upcoming high-density well-spacing trials, the operator primarily wanted to remove the risk of intervening in the depleted wellbore when milling out composite frac plugs. Those risks, unmitigated, can put higher-density drilling programs at risk due to the steep costs and time delays created when millout challenges...

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