Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 134-140.doi: 10.12108/yxyqc.20190516

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Transformation of development model of horizontal wells in ultra-low permeability and low-pressure reservoirs

AN Jie, TANG Meirong, CAO Zongxiong, WANG Wenxiong, CHEN Wenbin, WU Shunlin   

  1. Research Institute of Oil and Gas Technology, PetroChina Changqing Oilfield Company, Xi'an 710021, China
  • Received:2019-03-12 Revised:2019-05-23 Online:2019-09-21 Published:2019-09-16

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Abstract: Chang X reservoir in Ordos Basin has low pressure coefficient and poor physical properties. Advanced water injection in seven-spot pattern and long horizontal well development can lead to sharp water cut increase and high single well production rate. what's more,fracturing in order to avoid the cross between artificial fracture and the waist-water-line will make about 200 m useless because of no stimulation. Meanwhile,long shut-in time needed for advanced water injection affects the contribution of production wells. To solve the problem, based on experience of tight oil reservoir development and opposite development theory,this paper proposed a new development concept of none advanced water injection,less injection wells, shorter horizontal length, combination of volume fracture technique and dense tube cut method. After field experiment as well as optimization and research of well pattern adaptability,energy supplement,horizontal length and fracturing parameters,it shows that the proposed theory in five-spot pattern can provide better development effect,taking advantage of quick energy supplement,efficient water cut control and longer oil wells production time by 30%.This development method can contribute 20% cost reduction and 88% increase of total oil production per hundred meter. The research can be further applied and provide technical guidance to the tight reservoir development.

Key words: low-pressure tight formation, short horizontal well, water flooding, five-spot well pattern, dense tube cut, volume fracture

CLC Number: 

  • TE348
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