Production logging via coiled tubing fiber optic infrastructures (FSI) and its application in shale gas wells
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GMGDA 2019
Production logging via coiled tubing fiber optic infrastructures (FSI) and its application in shale gas wells Xuangang Meng 1 & Weijia Wang 2 & Zhenzhen Shen 1 & Jiangyong Xiong 2 & Heng Zhang 1 Received: 17 March 2019 / Accepted: 9 October 2019 / Published online: 11 December 2019 # The Author(s) 2019
Abstract Multistage stimulation operation using plug and perf technique is the main development mode in domestic shale gas play. Because of the particularity of well trajectory, well geometry caused by rapid drilling operation in shale gas wells, the residual plug debris after plug milling, the complexity of multiphase flow in horizontal section, etc., it is difficult for conventional production logging to meet the needs of shale gas wells. However, a number of shale gas wells need to be evaluated in the effects of well drilling and completion and fracturing, providing the guidance for the next fracturing design, so the production logging via coiled tubing fiber optic infrastructures (FSI) can satisfy the needs of shale gas wells, really reflect water holdup and gas holdup in different fracturing stage, and effectively evaluate fracturing effect of each stage. Keywords Coiled tubing . Fiber optic . FSI (flow scanned image) . Shale gas wells . Production logging
Preface At present, the shale gas wells in China are mainly composed of cluster well, long horizontal section, multistage perforation, and large zipper type sand fracturing. The production of gas test and pressure are unstable. It is difficult to implement the production of single well, and it is difficult to correctly understand the actual production situation of the formation and influence the formulation of the production plan of Lv et al. (2012). In view of the special completion mode of shale gas, the dynamic monitoring technology has no effective means to select the domestic and foreign post pressure evaluation technology, and gas production profile testing technology is the most economical and effective means to solve the above problems. At present, most of the downhole tools used in domestic conventional testing are multi-array distance and single rotor.
The testing work is complicated, the rotor needs larger start speed, and the monitoring error is large; the underground fluid type cannot be distinguished clearly. According to the optical fiber production profile testing technology with continuous tubing as the carrier, the main production layer and the bottom hole liquid condition can be found clearly under the ultra-long horizontal section and multilevel fracturing development mode of shale gas well. At the same time, the technology uses optical fiber as the data transmission means, the antiinterference ability is strong, and the electrical signal of the downhole monitoring tool is used. It is converted into light signal to transfer data faster and more accurately. The flow scanned image (FSI) production logging tool in the tool string has a multistage rotor. It can identify the downhole fluid dynamics more clearly. It has many charac
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