Analysis and inspiration of stable production of horizontal wells in high water saturation tight gas reservoir:A case study of Daniudi Gasfield,Ordos Basin
Received date: 2016-07-06
Revised date: 2016-09-27
Online published: 2017-01-10
Horizontal wells put into production in 2014 of Daniudi Gasfield show stable well productivity up to now,the law of productivity decline of these wells are apparently different from both wells in past years and wells in similar gas reservoirs.Causal analysis was carried out to study the stable production of horizontal wells put into production in 2014 of Daniudi Gasfield.Causes of the stable production were classified into geological reasons,engineering reasons and management reasons.Geological reasons include water production,length of sandstone in horizontal well and hydrocarbon-generating intensity.Engineering reasons refer mainly to design and construction of fracture and management reasons include the change of thought in drainage and proportion of production.Results show that water production is critical to the well production in tight gas reservoir,the lower the water production is,the easier the stable gas production will achieve.Bigger length of sandstone in horizontal well,higher hydrocarbon-generating intensity,bigger scale of fracturing and higher flow-back rate would also be advantageous to stable gas production.For high water saturation tight gas reservoir,top priority should be given to drainage.It is important to clear the development idea that “drainage and gas production are equally important and should be carried out simultaneously”.Reduce the proportion of production under efficient drainage can reduce the pressure drop rate of formation and is in favor of stable gas production.It is also proposed that for tight gas reservoir,scientific management is the key to efficient development,“ow gas production + high water production≠productivity decline”.Long-term stable production can also be achieved in high water saturation tight gas reservoir through deepened understanding of geological conditions,improvement of drilling/fracturing technology and optimization of development ideas.
Ding Jing-chen . Analysis and inspiration of stable production of horizontal wells in high water saturation tight gas reservoir:A case study of Daniudi Gasfield,Ordos Basin[J]. Natural Gas Geoscience, 2017 , 28(1) : 127 -134 . DOI: 10.11764/j.issn.1672-1926.2016.11.026
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