Mud Loss Control Techniques and Practices in Zhaotong Demonstration Zone of Shale Gas Drilling

ZHANG Zhilei; HU Baizhong; BIAN Weikun; FENG Jie; HAO Huijun; YANG Zheng

doi:10.3969/j.issn.1001-5620.2020.01.006

Volume 37 Issue 1

Feb. 2020

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ZHANG Zhilei, HU Baizhong, BIAN Weikun, FENG Jie, HAO Huijun, YANG Zheng. Mud Loss Control Techniques and Practices in Zhaotong Demonstration Zone of Shale Gas Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 38-45. doi: 10.3969/j.issn.1001-5620.2020.01.006

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ZHANG Zhilei, HU Baizhong, BIAN Weikun, FENG Jie, HAO Huijun, YANG Zheng. Mud Loss Control Techniques and Practices in Zhaotong Demonstration Zone of Shale Gas Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 38-45. doi: 10.3969/j.issn.1001-5620.2020.01.006

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Mud Loss Control Techniques and Practices in Zhaotong Demonstration Zone of Shale Gas Drilling

doi: 10.3969/j.issn.1001-5620.2020.01.006

1. CNPC Engineering Technology R&D Company Limited, Beijing 102206;
2. PetroChina Zhejiang Oilfield Company, Hangzhou Zhejiang 310023;
3. Zhejiang Oilfield Company Exploration&Development Department, Luzhou Sichuan 646400

Received Date: 2019-10-15
Publish Date: 2020-02-28

Abstract

Abstract

The Zhaotong Demonstration Zone of shale gas drilling is an important area favorable to shale gas exploration and development. Affected by the surface and underground conditions, mud losses have generally been encountered during drilling operations. Mud losses generally occurred in the shallow section, the medium-deep (vertical)section and the horizontal section. The mud losses were difficult to predict and become more severe with mud density. PetroChina Zhejiang Oilfield Company started studies on several topics such as predict of pore pressure and stability of natural fractures, prevention of low-density mud losses in horizontal section and mud loss control with deformable gel lost circulation materials (LCM). It was found through observation of drilling practice on several drilling platforms that a 3D geo-mechanical model can be used to predict the potential mud losses in medium-deep fractured formations. Technologies for preventing low-density mud losses and the deformable LCM have been tried on the well YS112 and the well YS131. By reducing the mud density to a reasonable level and enhancing the capacity of controlling mud losses with the deformable LCM, mud losses in horizontal drilling were successfully prevented from occurring. This paper, based on the statistical analyses of the mud looses encountered in previous drilling operations, discusses the current technologies for and practice of mud losses control, taking into account the geological characteristics of the Zhaotong demonstration zone of shale gas drilling. The technologies discussed in this paper can be used as references to the prevention of mud loss control in the demonstration zone.
- Shale gas,
- Mud loss,
- Fracture,
- Borehole stabilization,
- Zhaotong

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References(24)

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Mud Loss Control Techniques and Practices in Zhaotong Demonstration Zone of Shale Gas Drilling

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