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Drilling large diameter water wells in carbonate strata in the Lublin area

Macuda J., Macuda M.

AGH Drilling, Oil, Gas

2018

Vol. 35, no. 1

31--39

One of the most important sources of water for communal purposes in the Lublin area are the useful groundwater aquifers intaken with deep drilled wells. Such wells should be highly efficient and localized in a close vicinity of the local water supply network to lower the cost of transport. Large amounts of water can be produced by large diameter wells, where heavy duty pump aggregates can be installed. High rates of penetration cannot be obtained if the profile abounds in hardly drillable carbonate. This elongates the time of drilling and increases negative impact of mud on the near well zone of the aquifer. It also lowers hydraulic parameters of the well. To improve the efficiency of the wells, drillability tests with cogged bits were performed in carbonate rocks to optimize the mechanical parameters of drilling. Measurement sections, each 0.3 to 0.5 m long, were selected for the tests. Each section was drilled at constant rotational speed and weight of bit values. Prior to the drillability tests, the limits on the weight of bit and rotational speed of the bit were established, in line with the technological characteristic of rig Wirth B3A, strength of the string and of the cogged bit.

Reverse circulation DTH hammer drilling technology

Yin K., Bo K., Peng J., Fan L.

Zeszyty Naukowe. Górnictwo / Politechnika Śląska

2009

z. 287

289-297

The technical characteristics and operational principal of the reverse circulation DTH hammer drilling technology is introduced in this paper. It is that with the computerized emulation and the simulation technique to assist the drilling tool design, so the optimum designed DTH hammer gets stable performance, and the drilling bit is with good reverse-circulation ability, and further more, it has already developed serialization products. The reverse circulation DTH hammer drilling technology has been fully applied in areas such as the geological exploration core in complex formation, hydrological drilling wells, and large diameter rock embedding piles drilling in hard rock, and obviously, it is achieved favourable economic and social benefits.

W artykule scharakteryzowano technologię wiercenia z cyrkulacją zwrotną. Urządzenie DTH zapewnia dobrą wydajność, co decyduje o jego znaczeniu ekonomicznym. Wiercenia ze zwrotną cyrkulacją są stosowane w poszukiwaniach geologicznych (z rdzeniowaniem) w formacjach o złożonej budowie, w przypadku studni, odwiertów wielkośrednicowych, a także dla skał o dużej twardości.