Application of Continuous Circulation Drilling in Extended Reach Wells in the Panyu Oilfield

doi:10.11885/j.issn.1674-5086.2017.01.03.01

Abstract

Abstract: During the drilling of φ215.9 mm extended reach wells in the Panyu Oilfield, technical difficulties are encountered, such as deep well sections, long inclined sections, large inclination angles, rock debris accumulation, faults, abrupt narrowing of the safety density windows of drilling fluids, employment of oil-based drilling fluids throughout sections, high viscosity, and large gel strength. To overcome these difficulties, continuous circulation drilling is introduced, and the application of this technique in the φ215.9 mm section of the PY10-5-A1H Well is evaluated. The results demonstrate that, when the fluctuations of the full-section(1 026 m) equivalent circulating density (ECD) are less than 2.3%, the circulation pressure within the well is stable and the torque fluctuations are steady. The average penetration rate reaches 19.30 m/h, and the hole is well cleaned. Unnecessary repeated reaming and short trips are reduced, and non-drilling time is shortened to improve drilling efficiency and ensure safe and smooth drilling through faults. No complicated downhole situations such as leakage, collapse, and blockage are observed. This paper summarizes the impacts to the drill pipes and hoses at the moment when the circulation channels are switched and problems such as the disrupted transmission of measurement while drilling signals during field application. Specific measurements and improvements are suggested.

Key words: continuous circulation valve, Panyu Oilfield, extended reach well, ECD control, hole cleaning

CLC Number:

TE52

ZHANG Jie, WANG Zhiwei, MA Ling. Application of Continuous Circulation Drilling in Extended Reach Wells in the Panyu Oilfield[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 90-96.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2017.01.03.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2018/V40/I4/90

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