The development of natural gas in China has entered a golden and leap-forward stage, which is necessary bridge to clean energy. This in-depth study on the status quo, theory, technology prospect shows: (1) global remaining proven recoverable reserves are 186×1012 m3 reserves-production ratio 52.4, indicating solid resource base for long-term rapid development. (2) Ten formation distribution laws conventional unconventional reservoirs have been proposed. In terms exploration geology, theory...

Through reviewing the development history of tight oil and gas in China, summarizing theoretical understandings exploration development, comparing geological conditions technologies objectively China United States, we clarified progress stage envisaged future orientation theory technology, process methods policy. In nearly a decade, relying on practice, science technology research management innovation, huge breakthroughs have been made. The laws formation, distribution accumulation...

Sulige gas field is a typical tight sand in China. Well type and pattern optimization the key technology to improve single well estimated reserves recovery factor achieve effective development. In view of large area, low abundance high heterogeneity field, series techniques have been developed including hierarchical description for reservoir architecture composite bodies spacing optimization, design horizontal trajectory deliverability evaluation different types wells. These technologies...

Domestic natural gas production serves as the foundation of China's industry layout. It is great significance to predict medium and long-term trend its industry. In comparison United States, E&P in China reveals same direction parallel development conventional unconventional gas, with a more aggressive change China. This article presents detailed review several challenges that has faced like resource characterization, developmental technology, economic effectiveness, organization,...

Conventional recovery enhancement techniques are aimed at reducing the abandonment pressure, but there is an upper limit for due to energy limitation of reservoirs. Gas injection supplementation has become effective way enhance gas by hydrocarbon saturation in This review systematically investigates progress enhanced three aspects: experiments, numerical simulations and field examples. It summarizes analyzes current research results on EGR explores further prospects future research. The show...

During the development of multi-layer tight sandstone gas reservoirs in Ordos Basin, China, it has not been easy to calculate accurately production each individual layer wells. However, allocation provides a vital basis for evaluating dynamic reserves and drainage areas wells remaining distributions layers. To improve accuracy reliability wells, new model was constructed based on seepage equation, material balance pipe string pressure equation. In particular, this introduced equation with an...

The Lower Paleozoic Longmaxi and Qiongzhusi Formatiion shale plays were taken as research objects to summarize the geologic reservoir characteristics of marine gas in China. Based on theory technology achievements made during twelfth five-year plan, a key index system was established evaluate well production effect China, comprehensive classification consequently presented by integrating geological statistical indexes economic evaluation indexes; characterize complex fracture network formed...

The generation method of three-dimensional fractal discrete fracture network (FDFN) based on multiplicative cascade process was developed. complex multi-scale system in shale after fracturing characterized by coupling the artificial model and natural model. Based an assisted history matching (AHM) using multiple-proxy-based Markov chain Monte Carlo algorithm (MCMC), embedded modeling (EDFM) incorporated with reservoir simulator used to predict productivity gas well. When method, distribution...

Reasonable well spacing has been studied and assessed to increase the reserves improve recovery factor of Sulige gas field, where controlled by single are small. An evaluation methodology for optimizing in a tight sandstone field was established from five aspects including geologic model, drainage radius, interference testing, numerical simulation economic benefits. The optimized using this method. Through geological modeling, rational inter-well distance is estimated be less than 600 m...

A flow mathematical model with multiple horizontal wells considering interference between and fractures was established by taking the variable width conductivity as basic units. Then a semi-analytical approach proposed to production performance of full-life cycle in well pad investigate effect fracture length, capacity, spacing on estimated ultimate recovery (EUR). Finally, an integrated workflow is developed optimize drilling completion parameters incorporating productivity prediction...

For clarifying the inherent relation between relieving fracture closure and improving EUR by adopting pressure-control production system for shale gas fractured horizontal wells, significance of reservoir engineering, a dynamic formation–fracture coupling prediction model performance wells was established solved, with finite conductivity as basic flow unit variable stress sensitivity coefficient introduced. Through comparison calculated results from model, classical numerical modeling Saphir...

Design and optimization of well spacing is a key indicator for evaluating the development effect shale gas reservoirs. On basis theoretical understanding, after verification by analogy, numerical simulation, economic evaluation, complete workflow from inter-well interference simulation dynamic data diagnosis to multi-well production was formed. First, pressure detection boundary propagation model established simulate response degree under different connected conditions. Second, identified...

Research on the enhanced gas recovery (EGR) technology is urgently needed in most of China's major fields due to low their late development stages. To promote progress ERG theory and technology, this paper establishes a unified universal model for evaluation, analyzes key factors affecting recovery, expects prospect EGR. The results are obtained as follows. First, production degree reserves, pressure drawdown sweep efficiency depletion which product coefficients corresponding these factors....

A giant gas field refers to a with proved geological reserves of natural more than 30 billion cubic meters, peak annual output 1 and certain plateau period. It is an important foundation for the rapid growth China's production its long-term stable development in future. And it also key ensure security supply. By systematically analyzing practice 260 fields at home abroad dissecting simulating typical fields, this paper comprehensively studied connotation, core technology whole life cycle...

Abstract Shale gas reservoir is fractured formation with hydraulically fracture network surrounding the shale matrix. Two-phase (water/gas) flowback schedule of well designed without a sufficient understanding that how BHP-drawdown productivity. A two-phase coupled model established to simulate transient gas- and water-production from complex networks. In this work, new was account for unique transport mechanisms. Different properties flow mechanisms are assigned fracture-network domain,...

Abstract Low production rate and low estimate ultimate recovery are the most negative factors for gas well in tight development. Horizontal wells which can effectively improve flow matrix increase drainage areas common practices to level EUR. Compared with conventional reservoir, horizontal drilling reservoir more complicated as "sweat spots" distributed unevenly. Challenges of still remain effective track penetrate bearing sands much possible. Technique innovations have been developed from...

Abstract The principle focus of this work is on proposing a new model to evaluate the production performance complexly-fractured well in shale reservoirs for conducting rate transient analysis (RTA) and pressure (PTA). established trilinear-flow idealization presented by Brown et al. (2009) fractured horizontal associated with continuum geometry, fractal characterization anomalous diffusion. coupled could take into account non-uniform distribution fracture network within stimulated reservoir...