Analysis of fine segmentation adaptability of horizontal wells in tight sandstone gas reservoirs
Received date: 2016-11-25
Revised date: 2017-01-18
Online published: 2017-03-10
Staged fracturing of horizontal wells is an effective method for the development of tight sandstone gas reservoirs,numerical simulation shows that the reduction of oil and gas flow pressure can be greatly reduced,and the production of single well can be improved by shortening the distance between seams.With the variation of reservoir quality,the conventional subsection (80~100m) effect of the gas reservoir in Shaxi Temple Group is getting worse,and the production level is low.The use of independent development of the non-dynamic tube column is not limited to series of sets of tools,the fine segmentation and pseudo volume fracturing of horizontal well are tested in different regions of formation pressure.Don't move the pipe column segment number up to 20 segments,the average interval is 46.3m,the average volume of the liquid is 2 775.6m3.The pressure comparison shows that the high pressure gas reservoir volume fracturing effect is good,the production of the same time,compared with the conventional segmented well,accumulated high yield,good stability;but the normal gas reservoir volume fracturing pressure falls faster,and has flowback difficulties,poor fracturing effect.This,combined with the experimental analysis of the core damage reason of high pressure gas reservoir fracturing effect difference,is considered that the long time and large quantity of liquid are the great damage to the permeability of reservoir.At the same time,the normal pressure reservoir formation energy is low,and the filter is difficult to return to the reservoir.It is the main reason that causes the volume fracturing of this kind of gas reservoir to return to the line and the difference of the pressure.It is suggested that the normal pressure gas reservoir of tight sandstone should not be used for the reconstruction of horizontal well and large volume fracturing,and the high pressure gas reservoir can be popularized and applied.This study provides reference for similar gas reservoir development.
Huang Yu-zhong，Diao Su，Yin Lang，Li Tie-feng，Liu Qi . Analysis of fine segmentation adaptability of horizontal wells in tight sandstone gas reservoirs[J]. Natural Gas Geoscience, 2017 , 28(3) : 460 -465 . DOI: 10.11764/j.issn.1672-1926.2017.01.013
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