Special Oil & Gas Reservoirs >

2020 , Vol. 27 >Issue 4: 143 - 148

DOI: https://doi.org/10.3969/j.issn.1006-6535.2020.04.022

Drilling & Production Engineering

Test and Analysis of Mechanical Properties and Failure Patterns for the Deep Brittle Shale Under Complex Load

  • Fan Yu ,
  • Wang Jiajun ,
  • Liu Houbin ,
  • Wu Pengcheng ,
  • Gao Dewei ,
  • Wang Xudong
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  • 1. PetroChina Southwest Oil & Gas field Company, Chengdu, Sichuan 610000, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University), Chengdu, Sichuan 610500, China;
    3. Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    4. Sichuan Changning Natural Gas Development Co., Ltd., Changning, Sichuan 644000, China

Received date: 2019-11-13

  Revised date: 2020-03-23

  Online published: 2022-02-18

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Abstract

The deep shale in Zigong, Luzhou and other regions of Sichuan Province are characterized by high hardness, strong brittleness and well-developed bedding fractures, which results in frequent downhole stuck, overflow and other accidents during horizontal well drilling. The drilling fluid plugging performance and mechanical property tests under different confining pressure unloading rates were conducted for the deep brittle shale to clarify the effects of drilling fluid plugging performance and tripping out speed on the mechanical properties of brittle shale and the failure patterns. The test indicates that the drilling fluid plugging performance shows a significant effect on the strength and elastic modulus. The compressive strength and elastic modulus can reach 350 MPa and 16 000 MPa respectively with favorable drilling fluid plugging performance. The compressive strength and elastic modulus are only 40 MPa and 6 000 MPa respectively in case of poor drilling fluid plugging performance. The brittle shale is more likely to be failure under high confining pressure unloading rate. High tripping out speed will result in a sharp decrease of downhole effective liquid column pressure, which will lead to sidewall rock collapse. The shale failure always along the bedding fracture under bottom-hole pressure. This research reveals the mechanical properties and failure patterns of deep brittle shale under complex conditions, which could provide a scientific reference for formulating anti-collapse countermeasures.

Key words： brittle shale; rock mechanics; drilling fluid; wellbore stability; confining pressure; Luzhou Block

Cite this article

Fan Yu , Wang Jiajun , Liu Houbin , Wu Pengcheng , Gao Dewei , Wang Xudong . Test and Analysis of Mechanical Properties and Failure Patterns for the Deep Brittle Shale Under Complex Load[J]. Special Oil & Gas Reservoirs, 2020 , 27(4) : 143 -148 . DOI: 10.3969/j.issn.1006-6535.2020.04.022

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