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Yang H.,Petrochina | Yang H.,State Engineering Laboratory of Exploration and Development for Low Permeability Oil and Gas Fields | Liu X.,Petrochina | Liu X.,State Engineering Laboratory of Exploration and Development for Low Permeability Oil and Gas Fields | And 3 more authors.
Natural Gas Industry | Year: 2016

The PetroChina Changqing Oilfield Company (hereinafter referred to as the PetroChina Changqing) built the largest oil and gas production base of China in the Ordos Basin in 2013, achieving the yearly natural gas production of 375×108 m3 in 2015. For the further sustainable and stable production and quality and benefit improvement, such great achievements made in the 12th Five-Year Plan were first summarized, and the relevant favorable conditions for natural gas development were also analyzed as follows: abundant natural gas resources; increasingly mature E&P technologies; continuously improved delicacy management; and a surging demand for natural gas. Then, challenges to natural gas development were also discussed, including obvious deterioration of natural gas resources; diminished capacity of stable production of produced gasfields; increasing number of low-yield wells; and prominent supply-demand contradiction in present natural gas market. Finally, its prospect in the 13th Five-Year Plan was studied: to carry out natural gas exploration with focus on Upper Paleozoic tight gas, Lower Paleozoic carbonate rocks, and new areas and new domains, so as to achieve rapid growth of natural gas reserves and orderly replacement in exploration domains; to make rational development planning with focus on the stable production of mature gasfields; and to enhance tight gas recovery and strengthen capacity building in new areas, so as to achieve a steady rise of annual natural gas production in the giant gas province. It is expected that by the end of 13th Five-Year Plan period, the PetroChina Changqing will achieve its annual natural gas output of up to 400×108 m3. © 2016, Natural Gas Industry Journal Agency. All right reserved. Source


Li Y.,Petrochina | Li Y.,State Engineering Laboratory of Exploration and Development for Low Permeability Oil and Gas Fields | Xiao F.,Petrochina | Xiao F.,State Engineering Laboratory of Exploration and Development for Low Permeability Oil and Gas Fields | And 4 more authors.
Natural Gas Industry | Year: 2015

An outstanding issue in the oil and gas industry is how to evaluate quantitatively the influences of water production on production performance of gas wells. Based on gas-water flow theories, therefore, a new method was proposed in this paper to evaluate quantitatively the production performance of water-producing gas wells by using gas-water relative permeability curves after a comparative study was conducted thoroughly. In this way, quantitative evaluation was performed on production capacity, gas production, ultimate cumulative gas production and recovery factor of water-producing gas wells. Then, a case study was carried out of the tight sandstone gas reservoirs with strong heterogeneity in the Sulige Gas Field, Ordos Basin. This method was verified in terms of practicability and reliability through a large amount of calculation based on the actual production performance data of various gas wells with different volumes of water produced. Finally, empirical formula and charts were established for water-producing gas wells in the Sulige Gas Field to quantitatively evaluate their production capacity, gas production, ultimate cumulative gas production and recovery factor in the conditions of different water-gas ratios. These formula and charts provide technical support for the field application and dissemination of the method. Study results show that water production is serious in the west of this field with water-gas ratio varying in a large range. If the average water-gas ratio is 1.0 m3/104 m3, production capacity, cumulative gas production and recovery factor of gas wells will be respectively 24.4%, 24.4% and 17.4%. If the average water-gas ratio is 2.0 m3/104 m3, production capacity, cumulative gas production and recovery factor of gas wells will be respectively 40.2%, 40.2% and 33.2%. © 2015, Natural Gas Industry Journal Agency. All right reserved. Source


Li J.,Petrochina | Li J.,State Engineering Laboratory of Exploration and Development for Low Permeability Oil and Gas Fields | Fu B.,Petrochina | Fu B.,State Engineering Laboratory of Exploration and Development for Low Permeability Oil and Gas Fields | And 8 more authors.
Natural Gas Industry | Year: 2015

Reservoir characterization and modeling is a key technology in the field of oil and gas development. For tight sandstone gas reservoirs, reservoir characterization technology is still at exploratory stage. In the Sulige Gas Field, Ordos Basin, the principal gas producing layer is the 8th Member of the Shihezi Formation, Lower Permian, which is composed of multiphase channel sand bodies in the form of superimposition. It is geologically characterized by low porosity, low permeability and strong heterogeneity. With the scale development of horizontal wells, more accurate reservoir characterization is particularly important. In reference to oil reservoir characterization technologies, a technical idea of reservoir characterization for the Sulige Gas Field was proposed based on an analysis of the geologic characteristics of tight sandstone gas reservoirs and years' development practice. First, isochronal stratigraphic framework was established to conduct fine stratigraphic classification and correlation. Second, reservoir geologic database was set up to characterize sandbodies and especially effective sandbodies. And third, the 3D geologic modeling method was optimized to establish a fine geologic model. Based on current geologic modeling methods for fluvial reservoirs, facies-controlled modeling technologies for different development stages and different production data were summarized after geologic modeling results of Block Su 6 over the years were analyzed. Finally, the main development direction of reservoir characterization technologies for tight sandstone gas reservoirs was forecasted according to the practical development situations of the Sulige Gas Field. © 2015, Natural Gas Industry Journal Agency. All right reserved. Source

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