You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    Volume 41, Issue 1 (January 2018)

    Reservoir Evaluation Technology During Underbalanced Drilling of Horizontal Wells in Gas Reservoirs

    (Received 27 April 2017; accepted 23 October 2017)

    Published Online: 2017

    CODEN: GTJODJ

      Format Pages Price  
    PDF (876.98 KB) 7 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    This paper describes a method for real-time reservoir characterization during underbalanced drilling. Therefore, this study considers wellbore and formation as a system and establishes wellbore multiphase flow calculation and formation fluid-flow models. To acquire the basic data for the characterization in a timely way, the study develops and adopts the system of ground-monitoring devices to measure the formation fluid flow into the wellbore and to the surface in real time. The proposed mathematical models, construction parameters, and wellhole structure were used to calculate the downhole underbalanced pressure. Using the measured gas production and formation fluid-flow model, the permeability can be calculated. The mathematical models also reveal the actual formation fluid flow during the drilling phase, and thereby we could identify fracture characteristics (such as fracture development and heterogeneity) using a plot of permeability versus well depth. The proposed method was adopted to evaluate a depth range of 4,092 to 4,285 m in the Yingcheng formation of well X in the Jilin oil field and acquired the permeability according to the depth of the horizontal well in the gas reservoir (the average permeability was 0.059 md and microcracks were well developed). The proposed technique, which combines the recognition of formation parameters and monitoring of wellbore pressure and fluid flow, can improve the precision of underbalanced drilling control, and the calculated permeability truly reflects the fluid-flow situation during the drilling processes.

    Author Information:

    Wei, Na
    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu,

    Zhao, Xiangyang
    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu,

    Meng, Yingfeng
    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu,

    Li, Gao
    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu,

    Xiang, Hua
    Development of Offshore Oil and Gas Fields, Gubkin Russian State University of Oil and Gas, Moscow,

    He, Jun
    Drilling and Production Technology Research Institute of Jilin Oil Field, Songyuan,

    Sun, Wantong
    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu,

    Tang, Zhiguang
    Drilling and Production Technology Research Institute of Jilin Oil Field, Songyuan,


    Stock #: GTJ20170146

    ISSN:0149-6115

    DOI: 10.1520/GTJ20170146

    Author
    Title Reservoir Evaluation Technology During Underbalanced Drilling of Horizontal Wells in Gas Reservoirs
    Symposium ,
    Committee D02