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A new model of predicting the optimal mud density for maximizing the open-hole extension capacity in offshore extended-reach horizontal well drilling
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Xuyue Chena, b, *, Gengchen Lia, b, Qiqi Yanga, b, Jin Yanga, b, Deli Gaoa, b, Qinyi Heb, c
Petroleum Research | 2026, 11(3) : 995 - 1007
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Petroleum Research | 2026, 11(3): 995-1007
• Full Length Article •
A new model of predicting the optimal mud density for maximizing the open-hole extension capacity in offshore extended-reach horizontal well drilling
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Xuyue Chena, b, *, Gengchen Lia, b, Qiqi Yanga, b, Jin Yanga, b, Deli Gaoa, b, Qinyi Heb, c
Affiliations
  • aHainan Institute of China University of Petroleum (Beijing), Sanya, Hainan, 572000, China
  • bMOE Key Laboratory of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249, China
  • cPetroChina Tarim Oilfield Company, Korla, 841000, China
Published: 2026-09-10 doi: 10.1016/j.ptlrs.2026.01.016
Outline
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The pressure fluctuation caused by the axial movement of the string easily causes the bottomhole pressure to exceed the safe pressure window, which seriously restricts the horizontal open-hole extension capacity (OHEC) of the offshore extended-reach horizontal wells (ERHWs). In this work, in order to improve the horizontal OHEC for ERHWs, an optimal mud density model in extended-reach horizontal drilling (ERHD) was established based on the prediction and analysis of horizontal OHEC of ERHWs under string tripping operations. The results show that with the increase of mud density, the horizontal OHEC has a trend of first increasing and then decreasing in both tripping operations and casing tripping operations, and there exists an optimal mud density to maximize the horizontal OHEC. The optimal mud density of the two operations is obtained when the horizontal OHEC of the two operations is equal, and it is positively correlated with pull out of hole (POOH) speed, diameter of the wellbore and drill string, whereas it is negatively correlated with diameter of the casing and casing running speed. Controlling the tripping speed and optimizing the rheological properties are crucial to improve the horizontal OHEC. This model can provide scientific basis for optimization design of ERHD and the improvement of horizontal OHEC of ERHWs.

Offshore drilling  /  Extended-reach horizontal wells  /  Open-hole extension capacity  /  Optimal mud density
Xuyue Chen, Gengchen Li, Qiqi Yang, Jin Yang, Deli Gao, Qinyi He. A new model of predicting the optimal mud density for maximizing the open-hole extension capacity in offshore extended-reach horizontal well drilling[J]. Petroleum Research, 2026 , 11 (3) : 995 -1007 . DOI: 10.1016/j.ptlrs.2026.01.016
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Funding
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  • National Natural Science Foundation of China(52174012; 52394250; 52394255; 52234002; U22B20126; 51804322)
  • Ministry of Industry and Information Technology High-tech Ship Scientific Research Project(CBG2N21-4)
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Year 2026 volume 11 Issue 3
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47
9
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Article Info
doi: 10.1016/j.ptlrs.2026.01.016
  • Receive Date：2025-07-25
  • Online Date：2026-10-14
  • Published：2026-09-10
Article Data
Affiliations
History
  • Received：2025-07-25
  • Revised：2026-01-25
  • Accepted：2026-01-26
Funding
National Natural Science Foundation of China(52174012; 52394250; 52394255; 52234002; U22B20126; 51804322)
Ministry of Industry and Information Technology High-tech Ship Scientific Research Project(CBG2N21-4)
Affiliations
    aHainan Institute of China University of Petroleum (Beijing), Sanya, Hainan, 572000, China
    bMOE Key Laboratory of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249, China
    cPetroChina Tarim Oilfield Company, Korla, 841000, China

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* E-mail addresses: , (X. Chen).
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栓菌属 Trametes 5 2.39
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