Mature Fields

Case Study: SentinelCem™ Cement Cures Losses in Iraq Wells

Cement treatment saves operators millions of dollars annually Challenge – For years, operators drilling in the Rumaila, Zubair, and West Qurna fields in southern Iraq have routinely experienced severe and even total circulation losses at depths of 450–750 meters (1,476–2,461 feet). Underlying these fields is the karstified dolomite of the Dammam Formation, which has geological characteristics that include caverns, vugs, and large fractures....

Tech Paper: First Successful Cuttings Reinjection CRI Operation in Ecuador: An Alternative to Help Minimize the Environmental Impact in a Protected Area

Fully integrated process represents permanent drilling solution in environmentally sensitive areas This paper discusses a technology for waste management and disposal through cuttings reinjection (CRI). The fully integrated process was successfully applied in the Ecuador Apaika-Nenke field, which is an area with significant oil potential located in the heart of a protected biodiverse zone. The advantage of the applied process, from candidate selection...

Case Study: PetroGuard® Openhole Shunt System Ensures Gravel-Pack Success for TOTAL’s Four-Well Batch Completion

Shunt contributed to 100 percent pack efficiency despite challenging openhole conditions CHALLENGE – TOTAL performed several internal studies to determine the most appropriate lower completion solution for its wells. It was identified early on that the four-well campaign required openhole gravel packs to successfully retain and control the formation sands. Additionally, hydraulic simulations were performed and sensitivities were used to assess the potential...

Case Study: Well Construction Performance Shaves More Than Eight Days Off of Plan in Rumaila Field

Solution optimizes drilling time while lowering costs CHALLENGE – Halliburton was challenged to design, drill, and deliver wells in the Rumaila field – and to do this safely, efficiently, on time, and within the allocated budget. The geology in the field presented significant obstacles, including losses within naturally vuggy or fractured formations, challenges of drilling through highly reactive shale sequences with borehole instability...

Tech Paper: Numerical Maximization of the Secondary Polymer Flooding Value in a Mature, Offshore, Heavy Oil Reservoir

Methodology helps improve the chances of finding the maximum net present value solution Successfully implementing polymer flooding and maximizing benefits requires selecting best options of variables such as polymer concentration and slug, and number and location of new wells. Option-decisions combined generate thousands of scenarios. Therefore, even using smart algorithm optimizers to efficiently find the maximum of a business objective mathematical function can...

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...

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