Thm paper was prepared for presentabon at the 19S6 SPE Intemabonal ConfereM on Hcmzontat Well Technology held m Calgary, Canada, 18-20 Novem* 19% This papr was selected for presentawan by an SPE Prqrem Committee follovmg rewew of Inlormabcm cmtamed m an abstraci Submitted by the author(s) Contents of thm papw, as presented, have not been rewewed by ths %clely of Petroleum Engineers and are subject to wrractmn by the author(s) Th!s material, as presented, does not necessarily reflect any pmbon of Ihe Scuety of ptmleum Engineers ds oficars, or membars Papers presented at SPE meettngs are subject to publcatmn rewew by Edntortal Committees of the .?,c.aety of Petroleum Engineers Penn IssIcmto capy IS restricted to an abstraci of not more than 300 words IllustratIons may not be cop!ed The abstract should contain mnsp!cvous acknowledgment of where and by whom the paper was presented Whte Libfanan, SPE, P O. Box 833=, Rchardson, TX 75083 -3e3S, U S A fax 01-214-952-9435 AbstractThis paper presents an improved mathematical model for the axial force calculations along coiled tubing (CT) while drilling in inclined and horizontal wellbores. This new mathematical model is more general as it includes three types of coiled tubing configurations: straight, postbuckling "snaking", and helical. The equations for predicting the axial force under "snaking" configuration are believed to be presented for the first time. The "snaking" configuration of CT is of practical importance as it is a stable configuration for a wide range of axial loads. Several numerical case studies are provided to show the usefulness of the proposed axial force transfer model. The influences of friction, coiled tubing and wellbore size on the axial force predictions are described and presented in graphical form. Finally, a number of laboratory experimental results validate the proposed axial force transfer model as long as the effect of residual bending is not significant.

The extent of formation damage due to invasion of fracturing fluids during the hydraulic fracturing process was studied. An apparatus, which can simulate reservoir conditions, is described for measuring permeability before and after fluids are pumped across the surface of a core. Dynamic fluid loss was also measured of fluid which passes through the core plug.

No abstract

No abstract

No abstract