Evaluating Vertical and Horizontal Well Potential of Tight Oil Exploratory Wells in the Jimusaer Field

Chun, Kuang Li (Petrochina Xin Jiang Oilfield Company) | Xu, Jingwen (PetroChina Xin Juang Oilfield Company) | Jun, Mao Xin (Petrochina Xin Jiang Oilfield Company) | Chen, Chaofeng (PetroChina Xin Juang Oilfield Company) | Li, Xuebin (PetroChina Xin Juang Oilfield Company) | Judd, Tobias Conrad (Schlumberger) | Liu, Yuan (Schlumberger) | Liu, Hai (Schlumberger) | Jing, Li (Schlumberger)


The necessity to exploit hydrocarbon resources further down the resource triangle has resulted in the industry in attempting to evaluate large and more challenging resource plays due to the scarcity of conventional reserves. The Jimusaer Field located in the Junggar Basin in West China, represents such a scenario and covers a surface area exceeding 300,000 acres with a targeted reservoir thickness of 650 feet located between 9,100 and 14,500 feet TVD.
Typical exploration programs include extensive data collection of reservoir and hydrocarbon properties with respect to structural location. The assessment and evaluation of such data improves the understanding of the sub-surface uncertainties and associated risk. Given the uncertainty in well productivity, increased attention to the hydraulic fracturing process was required and included the application and combination of several types of technology which was built upon and optimized through the initial 28 vertical wells.
In order to further improve well performance, the application of long horizontal laterals combined with multi-stage hydraulic fracturing was needed in order to provide proof of commercial productivity and subsequent field development which for several years was not thought to be possible. Based on the initial vertical well results, three horizontal well were designed based upon the improved reservoir understandings. This phase was meant to further advance the understanding of the subsurface and completion and stimulation technologies while identifying areas for future productivity improvement.
Finally, the unique geological properties of this reservoir required different strategies and technology deployment in order to make them viable and sustainable in terms of reservoir and completion quality factors. The successful application of a locally developed technology plan and pilot program through a multidiscipline approach further demonstrated the suitability of a given technology with the lesson learned being captured and incorporated into future well designs.