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Li Z.-X.,Petrochina | Li J.,Petrochina | Qu X.-F.,Petrochina | Qu X.-F.,National Engineering Laboratory of Low Permeability Oilfield Exploration and Development | And 6 more authors.
Natural Gas Geoscience | Year: 2015

Chang 7 tight oil is characterized by poor physical properties, low formation pressure coefficient, well-developed natural fractures and high friability. In order to realize the goal of effective development with low-pressure tight oil, research has been carried out on three aspects to improve the early stages of single well production, stabilize for long time and reduce the cost through a series of field tests. After the four-stage technical innovation, great breakthrough has been achieved on tight oil development test, key technology for low-pressure tight oil has been established such as reservoir reconstruction technology of horizontal well volume fracturing, horizontal well development technique policy optimization, technology of reducing cost and increasing economic benefits, and four aspects of main knowledge have been gained as following: (1) long horizontal length plus volume fracturing are the core of promoting well production; (2) currently it is preferable to utilize approximate natural energy at the initial stage and energy supplement at later stage for horizontal wells with long horizontal length, volume fracturing; (3) controlled oil production is beneficial to promote tight oil development effects; (4) cost-reducing and efficiency-enhancing are important ways of exploiting tight oil economically and effectively. © 2015, Science Press. All right reserved. Source


Zhao J.,Petrochina | Zhao J.,National Engineering Laboratory of Low Permeability Oilfield Exploration and Development | Fan J.,Petrochina | Fan J.,National Engineering Laboratory of Low Permeability Oilfield Exploration and Development | And 6 more authors.
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | Year: 2015

There are two kinds of displacement mechanisms and three different seepage stages during horizontal well development process with water injection energy. A reasonable injection-production working system of the basic principles and parameters are determined according to the evaluation results of horizontal well development test on the basis of understanding fundamental rules. (1) Advanced water injection energy supplement mode is proposed with the combination of injection wells and large volume water fracturing of horizontal wells. (2) Theoretical calculation chart of directional well advanced water injection and water injection intensity is established for various reservoirs. (3) The timing of advanced water injection should follow the completion of the horizontal wells. (4) Reasonable initial production of horizontal well is determined by the relationship of remaining fluid volume with row spacing, advanced injection water volume and flood front advancing velocity. (5) Reasonable production flowing pressure is slightly greater than saturation pressure before water injection does not work, when it works, the reasonable production flow pressure maintains no less than two-thirds of saturation pressure, and adjust it timely combining with dynamic production. Based on the research results, the HQ oilfield put 80 horizontal wells into production during 2013, the proportion of water-breakthrough wells reduces from 8.8% to 3.0%, the annual decrease of the average production of single horizontal well is controlled within 15%. ©, 2015, Science Press. All right reserved. Source


Zhao J.,Petrochina | Zhao J.,National Engineering Laboratory of Low Permeability Oilfield Exploration and Development | Fan J.,Petrochina | Fan J.,National Engineering Laboratory of Low Permeability Oilfield Exploration and Development | And 6 more authors.
Petroleum Exploration and Development | Year: 2015

There are two kinds of displacement mechanisms and three different seepage stages during horizontal well development process with water injection energy. A reasonable injection-production working system of the basic principles and parameters are determined according to the evaluation results of horizontal well development test on the basis of understanding fundamental rules. (1) Advanced water injection energy supplement mode is proposed with the combination of injection wells and large volume water fracturing of horizontal wells. (2) Theoretical calculation chart of directional well advanced water injection and water injection intensity is established for various reservoirs. (3) The timing of advanced water injection should follow the completion of the horizontal wells. (4) Reasonable initial production of horizontal well is determined by the relationship of remaining fluid volume with row spacing, advanced injection water volume and flood front advancing velocity. (5) Reasonable production flowing pressure is slightly greater than saturation pressure before water injection does not work, when it works, the reasonable production flow pressure maintains no less than two-thirds of saturation pressure, and adjust it timely combining with dynamic production. Based on the research results, the HQ oilfield put 80 horizontal wells into production during 2013, the proportion of water-breakthrough wells reduces from 8.8% to 3.0%, the annual decrease of the average production of single horizontal well is controlled within 15%. © 2015 Research Institute of Petroleum Exploration & Development, PetroChina. Source

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