Challenges and Strategies of Infill-Drilling Within Large Scale Hydraulic Fracturing Zone for Shale Gas Due to Geostress Disturbance

Yijin Zeng, Xinming Niu, Yanbin Zang, Feifei Wang, Zizhen Wang

2018

Abstract

The Fuling shale gas field is planning to reduce the well spacing (600-1300 m at the early development stage) to about 300m by infill drilling works to accelerate recovery. We first summarized the drilling troubles and accidents in the early infill-drilling practices in Fuling. And we gave two representative examples to show the challenges of infill drilling works within geostress disturbance zone. One example is about gas kick and overflow, and the other is drilling fluid pollution by fracturing fluid from neighbouring well. Moreover, two practical strategies for these drilling challenges were put forward. The disturbance of the geostress caused by multistage hydraulic fracturing of neighbouring wells within a drilling units is numerically simulated to provide data for optimized design of well spacing and well path of the infill drilling in Fuling shale gas field. Recent infill-drilling practices with the aid of these effective strategies show much better performances. For example, the average rate of penetration (ROP) of an infill well (Y29-S1HF) with depth of 4245m reaches 12.02m/h, and no drilling troubles or accident occur.

Paper Citation

in Harvard Style

Zeng Y., Niu X., Zang Y., Wang F. and Wang Z. (2018). Challenges and Strategies of Infill-Drilling Within Large Scale Hydraulic Fracturing Zone for Shale Gas Due to Geostress Disturbance.In Proceedings of the International Workshop on Environment and Geoscience - Volume 1: IWEG, ISBN 978-989-758-342-1, pages 552-556. DOI: 10.5220/0007433405520556

in Bibtex Style

@conference{iweg18,
author={Yijin Zeng and Xinming Niu and Yanbin Zang and Feifei Wang and Zizhen Wang},
title={Challenges and Strategies of Infill-Drilling Within Large Scale Hydraulic Fracturing Zone for Shale Gas Due to Geostress Disturbance},
booktitle={Proceedings of the International Workshop on Environment and Geoscience - Volume 1: IWEG,},
year={2018},
pages={552-556},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007433405520556},
isbn={978-989-758-342-1},
}

in EndNote Style

TY - CONF

JO - Proceedings of the International Workshop on Environment and Geoscience - Volume 1: IWEG,
TI - Challenges and Strategies of Infill-Drilling Within Large Scale Hydraulic Fracturing Zone for Shale Gas Due to Geostress Disturbance
SN - 978-989-758-342-1
AU - Zeng Y.
AU - Niu X.
AU - Zang Y.
AU - Wang F.
AU - Wang Z.
PY - 2018
SP - 552
EP - 556
DO - 10.5220/0007433405520556