李凡华,乔磊,田中兰,孙清华,杜卫强,付盼. 威远页岩气水平井压裂套变原因分析[J]. 石油钻采工艺,2019,41(6):734-738.. DOI: 10.13639/j.odpt.2019.06.010
引用本文: 李凡华,乔磊,田中兰,孙清华,杜卫强,付盼. 威远页岩气水平井压裂套变原因分析[J]. 石油钻采工艺,2019,41(6):734-738.. DOI: 10.13639/j.odpt.2019.06.010
LI Fanhua, QIAO Lei, TIAN Zhonglan, SUN Qinghua, DU Weiqiang, FU Pan. Analysis on the causes of casing deformation in fractured shale-gas horizontal wells of Weiyuan Block[J]. Oil Drilling & Production Technology, 2019, 41(6): 734-738.. DOI: 10.13639/j.odpt.2019.06.010
Citation: LI Fanhua, QIAO Lei, TIAN Zhonglan, SUN Qinghua, DU Weiqiang, FU Pan. Analysis on the causes of casing deformation in fractured shale-gas horizontal wells of Weiyuan Block[J]. Oil Drilling & Production Technology, 2019, 41(6): 734-738.. DOI: 10.13639/j.odpt.2019.06.010

威远页岩气水平井压裂套变原因分析

Analysis on the causes of casing deformation in fractured shale-gas horizontal wells of Weiyuan Block

  • 摘要: 水平井压裂套变是近几年国内页岩气开发中普遍存在的一个技术问题,为了研究水平井压裂套变机理和控制套变发生,对页岩气水平井压裂过程进行分析,结合威远202区块和204区块的储层地质特点,通过对100余口压裂水平井的基础资料进行分析研究,找到了套变发生的特点和引起套变发生的主要原因。威远压裂水平井套变的主要影响因素是地质储层特点、压裂设计和地应力特点,套变的位置绝大多数位于层理缝发育的甜点区中。威远202区块的部分套变井与水平井段钻穿坚硬的五峰组有关,一部分套变点位于A靶点附近;威远204区块的压裂水平井的套变点也是主要位于A靶点附近的甜点区中。研究结果为进一步预测套变和防止套变发生提供了技术指导和经验基础。

     

    Abstract: Casing deformation in the process of horizontal well fracturing is one technical difficulty that exists in domestic shale gas development in recent years. In order to investigate the casing deformation mechanisms of horizontal well fracturing and control the occurrence of casing deformation, this paper analyzed the fracturing process of shale-gas horizontal well. Then, based on the reservoir geological characteristics of Weiyuan 202 and Weiyuan 204 Blocks, the main causes and characteristics of casing deformation were clarified by analyzing the basic data of over 100 fractured horizontal wells. It is shown that the main factors inducing the casing deformation in the fractured horizontal wells in Weiyuan are reservoir geological characteristics, fracturing design and in-situ stress, and most of the casing deformations lie in the sweet spot zones with developed bedding fractures. Some casing deformation wells in the Weiyuan 202 Block are related to the situation that the horizontal section penetrates the competent Wufeng Formation, and some casing deformation points are located near target A. In the Weiyuan 204 Block, the casing deformation points in fractured horizontal wells also mostly lie in the sweet spot zones and they are mainly located in the sweet spot zones near target A. The research results lay the foundation for the further prediction and control of casing deformation.

     

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