SciTech Connect

Title: Hot oiling spreadsheet

Hot oiling spreadsheet One of the most common oil-field treatments is hot oiling to remove paraffin from wells. Even though the practice is common, the thermal effectiveness of the process is not commonly understood. In order for producers to easily understand the thermodynamics of hot oiling, a simple tool is needed for estimating downhole temperatures. Such a tool has been developed that was distributed as a compiled, public-domain-software spreadsheet. That spreadsheet has evolved into an interactive from on the World Wide Web and has been adapted into a Windows{trademark} program by Petrolite, St. Louis MO. The development of such a tools was facilitated by expressing downhole temperatures in terms of analytic formulas. Considerable algebraic work is required to develop such formulas. Also, the data describing hot oiling is customarily a mixture of practical units that must be converted to a consistent set of units. To facilitate the algebraic manipulations and to assure unit conversions are correct, during development parallel calculations were made using the spreadsheet and a symbolic mathematics program. Derivation of the formulas considered falling film flow in the annulus and started from the transient differential equations so that the effects of the heat capacity of the tubing and casing could be more » included. While this approach to developing a software product does not have the power and sophistication of a finite element or difference code, it produces a user friendly product that implements the equations solved with a minimum potential for bugs. This allows emphasis in development of the product to be placed on the physics. « less
Authors:
Publication Date:
OSTI Identifier:OSTI ID: 446318
Report Number(s):SAND--96-2247
ON: DE97004358; TRN: AHC29706%%24
DOE Contract Number:AC04-94AL85000
Resource Type:Technical Report
Resource Relation:Other Information: PBD: Sep 1996
Research Org:Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org:USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
Country of Publication:United States
Language:English
Subject: 02 PETROLEUM; OIL WELLS; DEWAXING; THERMODYNAMICS; COMPUTERIZED SIMULATION; SPECIFIC HEAT; WELL CASINGS; HEAT LOSSES; MELTING; WAXES; MATHEMATICAL MODELS; THERMODYNAMIC PROPERTIES; HEAT TRANSFER