Title: Tool design of look-ahead electromagnetic resistivity LWD for boundary identification in anisotropic formation
Abstract: In this paper, a novel look-ahead electromagnetic resistivity LWD (LAEM-LWD) tool is designed to obtain accurate real-time information about the formation boundary in anisotropic formations. Based on the fast Hankel transform method, the effect law of environmental factors on logging response is simulated and analyzed in different formation models to discuss tool application conditions. The look ahead distance (LAD) is analyzed using a two-layer formation at different inclination angles, indicating that the tool can be applied well when the resistivity of tool formation is approximately 20–200 Ω m. Next, the use of symmetrized signals in the Oklahoma model for boundary identification under different inclination angles is discussed. Several anti-symmetrized signals and resistivity cross-plots for the anisotropy coefficient and horizontal resistivity extraction are created in the vertical well and verified by a five-layer model, which lays a theoretical basis for tool design of LAEM-LWD, effective geosteering, and real-time formation evaluation.
Publication Year: 2019
Publication Date: 2019-09-27
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 6
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot