Research and Application of Reverse Circulation Drilling Technology

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe reverse circulation drilling technology is that drilling fluid is pumped down to the annulus, through drill bit and inside of the drilling tool, comes back to the ground. It has many advantages, such as reducing the formation leakage, protecting the oil and gas formation, and cutting sample very clear etc. It includes air lifting, air and pump sucking reverse circulation drilling. Air lifting reverse circulation drilling needs air compressor, air tank, air box, double wall drill tool, air mixer and reverse drilling bit etc. By applying the original drilling rig, these equipments are connected to drill string and carried out the drilling work, after finishing drilling work, these equipments can be removed totally, and have no influence to the normal drilling work. Through testing and on-site application, these equipments are coordinative, drilled 400m in the leaking formation and got a better effect.

Borehole Instability in Decomposed Granite Seabed for Rock-Socketed Monopiles during “Drive-Drill-Drive” Construction Process: A Case Study

“…During the construction process of the monopiles for the 16 wind turbines at the wind farm, varying degrees of To complete the installation of the offshore wind turbine foundations within the limited construction window, the highly efficient and rapid gas-lift reverse-circulation construction technology was employed during the drilling phase, as illustrated in Figure 4. The reverse-circulation construction process entails directing compressed air into the drill bit through the annular space of the double wall drill pipe, causing the compressed air to mix with seawater and the drill cuttings generated during drilling to form a low-density gas-liquid mixture [16]. The resulting difference in liquid density between the inside and outside of the pipe drives the cuttings in the drill hole to be transported from the inner pipe to the surface via water flow, creating a cyclical reaction.…”

Experience in the Implementation of Water-Gas Exposure Technology in the Fields

“…Узел впускного клапана упадет на дно отстойника 6. Если сбивание окажется по каким-то причинам невозможным, то клапан разбуривают шарошечным долотом или специальной фрезой [8][9][10][11][12][13][14][15][16][17][18][19][20].…”