The Experiment and Recognition of the Development of Chang 7 Tight Oil in Ordos Basin
Received date: 2015-04-17
Revised date: 2015-06-19
Online published: 2015-10-10
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.
Key words: Chang 7 tight oil; Key technologies; Practice; Ordos Basin
LI Zhong-xing,LI Jian,QU Xue-feng,LI Xian-wen,LEI Qi-hong,FAN Jian-ming . The Experiment and Recognition of the Development of Chang 7 Tight Oil in Ordos Basin[J]. Natural Gas Geoscience, 2015 , 26(10) : 1932 -1940 . DOI: 10.11764/j.issn.1672-1926.2015.10.1932
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