考虑技术经济条件下的威远页岩气田水平井长度优化  

Optimization of the horizontal well length in Weiyuan shale gas field under technical and economic conditions

作　　者：何畅 万玉金[1] 王南[1] 张航[2] 位云生[1] 张晓伟[1] 苏云河[1] HE Chang;WAN Yujin;WANG Nan;ZHANG Hang;WEI Yunsheng;ZHANG Xiaowei;SU Yunhe(PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;Northeast Sichuan Gas Field of PetroChina Southwest Oil& Gas Field Company, Dazhou 635000, China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油西南油气田公司川东北气矿,四川达州635000

出　　处：《大庆石油地质与开发》2021年第3期158-166,共9页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“页岩气气藏工程及采气工艺技术”(2016ZX05037-006)。

摘　　要：页岩储层水平井合理长度优化对合理开发至关重要。综合考虑技术与经济条件,对威远页岩气田不同长度水平井开发周期内(10 a)的产量、单井投资、经济效益进行详细分析,明确了该区最优经济价值条件下水平井长度范围,讨论了天然气价格、页岩气补贴、建设投资、单井产量对不同长度水平井开发效益的影响。研究结果表明:威远页岩气田高产井比例与水平段长度正相关,但受地质条件和施工质量的影响,水平井长度并非越长越好,当水平井长度超过一定界限时,高产井比例增幅变缓;在当前主体工艺技术、天然气销售价格为1.275万元/104m3、无页岩气补贴、投产后期操作成本为0.25万元/104m3的条件下,威远页岩气田水平井最优长度为1800~2200 m。研究成果为页岩气藏经济有效开发提供了重要参考。The reasonable length optimization of horizontal wells is very important for the rational development of shale reservoirs.Considering technical and economic conditions comprehensively,the detailed analyses were engaged for the horizontal wells with different lengths in Weiyuan shale gas field in the life cycle of development,including ten-year production,individual well investment and economic benefits,thus the length range with the optimal economic value in the block was defined.The effects of the natural gas price,shale gas subsidy,construction investment and individual well production on the development benefits of horizontal wells with different lengths were also discussed.The study results show that there is a positive correlation between the proportion of high-production gas wells and the horizontal well lateral length,but affected by geological conditions and engineering quality,it is not always that the longer the horizontal well length,the better the effect as the lateral length exceeds a certain limit,the increase of the proportion of high-production wells slows down.With the help of current main technologies,the optimal horizontal well length is 1800~2200 m in Weiyuan shale gas field when the gas sale price is 1.275×10 Yuan/10 m without shale gas subsidy,and the operation cost is 0.25×10 Yuan/10 m in the later stage of production.The research results provide important references for the economic and effective development of shale gas reservoirs.

关 键 词：页岩气 水平井长度 技术经济 优化设计 威远页岩气田 

分 类 号：TE33[石油与天然气工程—油气田开发工程]