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Natural Gas Exploration and Development >

2025 , Vol. 48 >Issue 1: 66 - 71

DOI: https://doi.org/10.12055/gaskk.issn.1673-3177.2025.01.008

OIL AND GASFIELD DEVELOPMENT

Safe drilling technology for horizontal wells of coal-rock gas in Lower Cretaceous Huoshiling Formation, southern Songliao Basin

  • SUN Pingtao ,
  • XING Dongyang ,
  • OU Ge ,
  • PANG Xiaodong
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  • Oil and Gas Technology Research Institute, PetroChina Jilin Oilfield Company, Songyuan, Jilin 138000, China

Received date: 2024-06-26

  Revised date: 2024-10-31

  Online published: 2025-03-04

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Abstract

As an unconventional hydrocarbon resource, the coal-rock gas of the Lower Cretaceous Huoshiling Formation in southern Songliao Basin is characterized by wide distribution and large reserves. It is an important replacement resource of conventional gas. However, in the Formation, the carbonaceous mudstones with high hardness contain developed microfractures which are mostly horizontal. When the wellbore inclination angle reaches more than 88°, a large number of rock fragments will be produced from the carbonaceous mudstone sidewall. These fragments cannot be broken along with the rotation of drilling tools and are difficult to be carried to the ground, making the wellbore cleaning very challenging. The fragments accumulated at the bottom hole may cause downhole accidents such as pipe blocking and even sticking during tripping process. In severe cases, plugging and sidetracking may be required. Therefore, some researches have been conducted on accurate prediction of collapse pressure, optimization of drilling fluid performance, and determination of anti-sticking measures. The results show that the sidewall can be mechanically supported in an effective manner through optimization of drilling fluid density on the basis of prediction of the collapse pressure in carbonaceous mudstones and coal rocks by means of software modeling with the aid of core experiment results and logging data, and determination of formation leakage pressure through leak off test during pilot hole operation. Moreover, the risk of sticking can be greatly mitigated by enhancing the plugging and inhibition capacities of drilling fluid, optimizing the drilling assembly and formulating appropriate anti-sticking measures. During field application, the issue of sticking was successfully resolved four times, and effectively prevented eight times. Additionally, the length of the horizontal section was extended from 287 m to 765 m, initially addressing the sticking problem when drilling through carbonaceous mudstone intervals of this area. The research results are conducive to facilitating the exploration and development of deep coal-rock gas in the Songliao Basin.

Key words： Carbonaceous mudstone; Horizontal well; Sticking; Coal-rock gas; Developed microfracture; Hard brittle mudstone

Cite this article

SUN Pingtao , XING Dongyang , OU Ge , PANG Xiaodong . Safe drilling technology for horizontal wells of coal-rock gas in Lower Cretaceous Huoshiling Formation, southern Songliao Basin[J]. Natural Gas Exploration and Development, 2025 , 48(1) : 66 -71 . DOI: 10.12055/gaskk.issn.1673-3177.2025.01.008

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