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Hongkui, Ge (University of Petroleum, (East China) Dongying) | Yingsong, Lin (University of Petroleum, (East China) Dongying) | Shanzhou, Ma (University of Petroleum, (East China) Dongying) | Lili, Song (University of Petroleum, (East China) Dongying)
Carbonate reservoirs hold more than 70% of the worldwide reserves. The knowledge related to the development of those reservoirs is not very developed due to the complexity of the lithology, the presence of post-sedimentation events such as diagenesis and the complex mechanical behavior. With the development of horizontal drilling in order to maximize the reservoir contacts (MRC), the need for accurate characterization of the horizontal variability of the mechanical properties of the rocks, becomes more critical. Classical 1D geomechanical models are no longer sufficient for the optimization of the drilling.
In this paper we address the issues mentioned above, through a 3D stochastic modeling of one of the critical parameters during the drilling of horizontal wells: The Formation Parting Pressure (FPP). This parameter allows the optimization of the mud-weight during the drilling of a well and optimizes the economic profitability of this well, while reducing the risks related to under or overpressure.
Three dimensional modeling of geomechanical parameters of the reservoir is an important task when dealing with drilling wells in carbonate reservoirs (Ait- Ettajer, et al. 2014)(Azim, et al. 2014). An inadequate calibration of drilling parameters such as mud weight, injection pressure might increase the cost of the drilling with a possibility of irremediable damaging of the reservoir. Classical approaches tend to build a one dimension geomechanical model along the well; however the current development of horizontal wells for optimal well sweeping requires a precise geomechanical model in three dimensions, especially for injection procedure in carbonates reservoirs with heterogeneous rock strengths distribution. We propose a workflow for assessing the critical parameters that impact the drillability and the economic cost of developing carbonate reservoir through horizontal drilling.
After a short description of the representation of the 3D reservoir model, we will describe the process of building the 3D model of Poisson Ratio using laboratory measurements and seismic volumes, and then we will describe the process for 3D assessment of the Fracture Parting Pressure parameter that will help optimizing the drilling parameters. We will show a case study of the application of the workflow for the optimization of the drilling in onshore carbonate reservoir.
Zhang, Fanchang (College of Geo-Resources and Information, China University of Petroleum (Huadong)) | Zhang, Shixin (College of Geo-Resources and Information, China University of Petroleum (Huadong)) | Yin, Xingyao (College of Geo-Resources and Information, China University of Petroleum (Huadong))
Yijun, Wang (BGP, CNPC) | Yubin, Du (Changqing Oilfield, CNPC) | Yabin, Guo (BGP, CNPC) | Linke, Zhang (BGP, CNPC) | Yang, Gao (Changqing Oilfield, CNPC) | Dahong, Chen (BGP, CNPC) | Peng, Wang (BGP, CNPC)
The tight sandstone gas reservoir in Ordos Basin is characterized by “thin reservoir, low porosity, low permeability, low pressure, low abundance and strong heterogeneity”, together with low single well production, rapid pressure drop, facing the problems such as stable production and development. In order to develop geological reserves efficiently, horizontal well is widely used in this area. The characteristics of tight sandstone gas reservoir determine that fracturing is the inevitable choice for its economic development. In the past, the fracturing schemes were only determined by “one hole view”, which was lack of deep understanding of reservoir in the area surrounding boreholes. Therefore fracturing schemes were insufficient and economical enough. In order to solve the problems above, a set of seismic methods has been created. Firstly the method of multidimensional analysis of rock physics is used to optimize the geophysical parameters that are sensitive to the gas bearing property of the reservoir. Secondly pre-stack gather data with high quality are obtained by using the processing technology of the relative amplitude of the wide azimuth and the OVT (offset vector slice). Thirdly the spatial distribution of the reservoir is predicted by using the pre-stack elastic inversion. And Combined with the three-dimensional visualization technology, the reservoir distribution of surrounding area of the borehole is determined, which will guide the optimization of fracturing location and direction and scale, so as to perfect the fracturing reconstruction scheme. The set of methods has obtained a good result in Shaan* block of Sulige gas field in China. 44 horizontal wells have been tested achieving a great success. Among them, the AFO of 6 horizontal wells of G* well cluster is over one million m3, making the highest record in the horizontal well development history! So this set of seismic technology is an effective way to optimize the fracturing scheme of horizontal well in tight sandstone gas reservoir. Presentation Date: Tuesday, October 13, 2020 Session Start Time: 8:30 AM Presentation Time: 11:00 AM Location: 362D Presentation Type: Oral
Azeemuddin, M. (Center for Petroleum & Minerals, The Research Institute, King Fahd University of Petroleum & Minerals) | Scott, T.E. (The University of Oklahoma) | Zaman, M. (The University of Oklahoma) | Roegiers, J.-C. (The University of Oklahoma)