Making Debut at the 1st Large‑Diameter Shield Summit: Luoyang Jiujiu Technology’s Rock‑Breaking Disc Cutters Safeguard the World’s Longest Subsea High‑Speed Railway Tunnel

Abstract: On August 29, the 1st Large‑Diameter Shield Summit convened in Ningbo, Zhejiang. The delegation from Luoyang Jiujiu Technology Co., Ltd. attended the event, conducted technical exchanges with industry experts on intelligent shield tunneling, and highlighted the company’s cutting‑tool technical achievements and engineering practices applied in the Jintang Subsea Tunnel of Ningbo‑Zhoushan Railway.

2026-09-04

Special Drilling Equipment and Supporting Components

Abstract：This paper systematically elaborates the structural characteristics, core parameters and safety design criteria of nine types of special drilling equipment and supporting components including derricks, pulley blocks, drilling hooks and winches. It compares the performance differences, advantages, disadvantages and applicable working conditions of various equipment, analyzes the influences of steel wire rope threading technology, drill pipe materials and connection joint forms on drilling operations, and summarizes the development trends of equipment lightweighting, modularization and rapid assembly. The research can provide a reference for equipment selection and safe construction of engineering drilling.

2026-08-27

Principles for Drilling Equipment Selection and Composition System

Abstract: This paper elaborates six major principles for drilling equipment selection, introduces the composition systems of percussion drilling and rotary drilling equipment, and clarifies the selection basis and overall architecture of drilling equipment.

2026-08-12

Jet Reverse Circulation Well Flushing

Abstract：Combined with the domestic and foreign equipment parameters and the localization application status of drilling engineering in 2026, this paper systematically elaborates the working mechanism, complete set of equipment, technical indicators, applicable working conditions and process optimization development direction of the jet reverse circulation well flushing technology, providing theoretical and practical basis for the scheme selection of well flushing in shallow large-diameter drilling engineering.

2026-07-21

Pump Suction Reverse Circulation Well Flushing Method

Abstract: This paper introduces the pump suction reverse circulation well flushing technology, which realizes well bore desilting through negative pressure suction. It involves special equipment and two starting methods, among which vacuum negative pressure starting is the preferred one. This technology is energy-saving and efficient, suitable for medium-shallow water wells with a depth of 60–80 meters. The construction key points, restricted scenarios and acceptance standards such as sand content of water quality are specified.

2026-07-10

Air-Lift Reverse Circulation Well Flushing Method

Abstract: This paper elaborates the principle, complete supporting equipment and core parameters of air-lift reverse circulation well flushing technology, as well as field fault disposal methods, compares the advantages and disadvantages of two types of mixers, and provides standardized construction control indexes.

2026-06-25

Drilling Well Flushing Technology

Abstract：This paper introduces the three core functions of well flushing in drilling: cooling drilling tools, removing cuttings and cleaning the bottom, and supporting the wellbore. It expounds the characteristics and selection requirements of four types of well flushing media. The two mainstream well flushing processes, direct circulation and reverse circulation, are compared, their respective characteristics are analyzed, and the technical parameter control standards for the reverse circulation process are clarified, which can provide a reference for field drilling construction.

2026-06-12

Raise Boring Drilling

Abstract: This paper introduces raise boring drilling, a highly efficient vertical shaft construction technique featuring reverse upward excavation from bottom to top. With advantages including high safety, low disturbance, and high efficiency, it is widely applied in mining, underground engineering, and other fields. The technology is divided into two categories: full-face raise boring and core barrel raise boring. Full-face raise boring, including pull-up and jack-up types, is suitable for large-diameter shafts and shafts of varying depths. Core barrel raise boring enables simultaneous shaft formation and geological coring, and is applicable to small‑to‑medium shallow‑to‑medium‑depth shafts. The technology is evolving toward intelligence, greater depth, and unmanned operation.

2026-05-28

Bored Pile Drilling

Abstract: This paper elaborates on bored pile drilling technology, identifying bored piles as an important type of cast-in-place end-bearing pile. Compared with precast piles, bored piles feature controllable costs, low steel consumption, strong capability for large-diameter and ultra-deep hole forming, wide geological applicability, and low environmental impact, while still facing deficiencies such as sediment cleaning and borehole wall mud cake issues. It also introduces the basic requirements, characteristics, conventional and innovative drilling processes, and points out the broad application prospects of this technology amid technological innovation.

2026-05-20

Diaphragm Wall Drilling

Abstract: This paper briefly describes the development history of diaphragm wall drilling technology and its applications in municipal, water conservancy, transportation and other fields. It details two major drilling methods, namely the panel method and the shaft array method, as well as two drilling sequences, namely horizontal drilling and vertical drilling. It also mentions the advantages of relevant technological breakthroughs, presenting its core content and application value.

2026-05-08