Practice and understanding of sidetracking horizontal drilling in old wells in Sulige Gas Field, NW China

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英文篇名：Practice and understanding of sidetracking horizontal drilling in old wells in Sulige Gas Field, NW China 作者：ZHANG ; Jinwu ; WANG ; Guoyong ; HE ; Kai ; YE ; Chenglin 英文作者：ZHANG Jinwu;WANG Guoyong;HE Kai;YE Chenglin;Sulige Gas Field Branch of the Great Wall Drilling Company in CNPC;The Great Wall Drilling Company in CNPC; 英文关键词：Sulige Gas Field;;sidetracking horizontal well;;tight sandstone;;old well stimulation;;reserves producing 中文刊名：PEAD 英文刊名：石油勘探与开发(英文版) 机构：Sulige Gas Field Branch of the Great Wall Drilling Company in CNPC;The Great Wall Drilling Company in CNPC; 出版日期：2019-04-15 出版单位：Petroleum Exploration and Development 年：2019 期：v.46 基金：Supported by the Project of Great Wall Drilling Company in CNPC(2015A25-2(2012)) 语种：英文; 页：PEAD201902018 页数：9 CN：02 ISSN：10-1529/TE 分类号：182-190

摘要

To seek effective ways of lowering development cost and tapping inter-well remaining reserves, sidetracking horizontal wells from old wells in Su10 and Su53 Block were conducted. The engineering and geological problems such as leakage, collapse and sticking in slim-hole sidetracking, and difficult evaluation of remaining gas were gradually overcome, and a set of drilling and completion technology, well deployment optimization technology and geo-steering technology suitable for sidetracking horizontal wells in tight sandstone gas reservoirs have been worked out. By making full use of the old well, sidetracking horizontal wells can greatly reduce development costs, enhance the producing degree of inter-well remaining reserves, and get production 3-5 times of that of adjacent vertical wells.Its production effect is influenced by encountered sandstone length, the position of the horizontal segment in the reservoir, produced effective reservoir thickness, gas saturation, controlled reserves and fracturing effect, etc. Up to now, in Block Su10 and Su53, 12 sidetracking horizontal wells have been drilled, which have an average drilling cycle of 49 days, average horizontal section length of 689 m,average effective drilling ratio of 61.5%, average well-head pressure of 16.2 MPa, and daily output of 4.7×10~4 m~3 at the initial stage after production. By the end of 2017, the average yield increment was more than 1 000×10~4 m~3 with good effect. With the increase of low yield old wells, wells in the enrichment regions tend to be saturated and the rest gas-bearing areas are lower in grade, therefore, sidetracking horizontal well can be used for optimization of well pattern, well deployment mode and exploitation of remaining oil areas.
        To seek effective ways of lowering development cost and tapping inter-well remaining reserves, sidetracking horizontal wells from old wells in Su10 and Su53 Block were conducted. The engineering and geological problems such as leakage, collapse and sticking in slim-hole sidetracking, and difficult evaluation of remaining gas were gradually overcome, and a set of drilling and completion technology, well deployment optimization technology and geo-steering technology suitable for sidetracking horizontal wells in tight sandstone gas reservoirs have been worked out. By making full use of the old well, sidetracking horizontal wells can greatly reduce development costs, enhance the producing degree of inter-well remaining reserves, and get production 3-5 times of that of adjacent vertical wells.Its production effect is influenced by encountered sandstone length, the position of the horizontal segment in the reservoir, produced effective reservoir thickness, gas saturation, controlled reserves and fracturing effect, etc. Up to now, in Block Su10 and Su53, 12 sidetracking horizontal wells have been drilled, which have an average drilling cycle of 49 days, average horizontal section length of 689 m,average effective drilling ratio of 61.5%, average well-head pressure of 16.2 MPa, and daily output of 4.7×10~4 m~3 at the initial stage after production. By the end of 2017, the average yield increment was more than 1 000×10~4 m~3 with good effect. With the increase of low yield old wells, wells in the enrichment regions tend to be saturated and the rest gas-bearing areas are lower in grade, therefore, sidetracking horizontal well can be used for optimization of well pattern, well deployment mode and exploitation of remaining oil areas.

引文

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