Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (6): 132-137.doi: 10.3969/j.issn.1673-8926.2015.06.018

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Geosteering technology of horizontal well and its application in Sulige Gas Field

Sun Weifeng 1,2,Zhang Ji 1,2,Ma Zhixin1,2,Hao Qian 1,2,Shi Linhui 1,Zhang Zhigang   

  1. 1. Research Center of Sulige Gas Field , PetroChina Changqing Oilfield Company , Xi ’ an 710018 , China ; 2. National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields , Xi ’ an 710018 , China
  • Online:2015-12-20 Published:2015-12-20

Abstract:

 Sulige Gas Field is a typical tight gas reservoir characterized by low permeability, low pressure, low abundance and strong heterogeneity. Horizontal well development is significant for well production increase. However, horizontal well drilling Geosteering difficulty is the bottleneck restricting the development of efficient technologies. There are problems such as mudstone interlayers, difficulties for judging structure and bottom lithology during the process of drilling geosteering. On the basis of deployment and design of horizontal well technology, by analyzing the specific circumstances of the horizontal section drilling mud, combined with the analysis of vertical stacking sand relations and internal reservoir, this paper summarized a set of adjustment measures of horizontal section guiding suitable for gas reservoirs of He 8 member, and illustrated by taking the actual drilling from AH well as an example. The development of horizontal wells for many years proved that by using geosteering technology for horizontal well development, the average sandstone drilled rate can reach 85.7%, the average effective reservoir drilled rate is 62.5%, and horizontal well production is 3 to 5 times than that of vertical well.

Key words: pores evolved from anhydrite and gypsum nodules, weathering crust reservoir, genesis evolution, Majiagou Formation , Ordos Basin

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