Abstract
The addition of a polymer to the jet medium enhances its ability to break rock, and the structure of the nozzle plays a vital role in the full utilization of energy. In this paper, a self-propelled porous jet bit with a support plate is designed, which can prevent the drill bit from jamming due to the jet nozzle against the bottom of the well during the drilling process. And the structural design of the cone-converging nozzle is applied to the forward center nozzle. The polymer additive jet flow field and the pure water jet flow field were compared by numerical simulation and experimental investigation. The results show that the polymer additive jet has a longer isokinetic core, and the rock-breaking volume of the polymer additive jet is much larger than that of the pure water jet, and the optimal spray distance is increased. The forward central jet with the conical convergent nozzle structure has more efficient rock-breaking ability.
Highlights
High-pressure water jet technology is widely used in cutting, crushing, cleaning, and other aspects due to its high material utilization, no thermal effect, concentrated energy, safe operation, and no dust generation. e factors affecting the impact of the water jet are mainly the nozzle structure, the driving force of the jet, the nature of the jet liquid, the spray distance, and so on. e addition of high molecular weight polymer to the jet can effectively reduce the resistance of the fluid, reduce the energy consumption, and improve the isokinetic core of the jet
Liu and Li [3, 4] of China University of Petroleum measured the flow field of the pure water jet and different concentration additive (PAM) jets through LDV. e experimental results show that the additive jet is longer than the constant velocity core of the pure water jet, and the constant velocity core is the longest when the additive concentration is in the range of 100–200 mg/L
In order to protect oil and gas reservoirs and effectively carry rocks, it is better to add a certain amount of polymer additives in the jet medium, and the jet effect will be different from that of the pure water jet. rough the numerical simulation analysis of the polymer additive jet flow field and pure water jet flow field, the influence of polymer additive on jet rock-breaking effect is explored. e research results can guide the hydraulic parameter design of horizontal drilling
Summary
High-pressure water jet technology is widely used in cutting, crushing, cleaning, and other aspects due to its high material utilization, no thermal effect, concentrated energy, safe operation, and no dust generation. e factors affecting the impact of the water jet are mainly the nozzle structure, the driving force of the jet, the nature of the jet liquid, the spray distance, and so on. e addition of high molecular weight polymer to the jet can effectively reduce the resistance of the fluid, reduce the energy consumption, and improve the isokinetic core of the jet. E addition of high molecular weight polymer to the jet can effectively reduce the resistance of the fluid, reduce the energy consumption, and improve the isokinetic core of the jet. There are few simulation analyses of the Advances in Polymer Technology additive jet flow field at present, and most of the research studies tend to be experimental research on the effects of actual cutting and crushing [12,13,14,15,16,17,18,19]. Is technology requires the use of the high-efficiency rock-breaking water jet bit, high-pressure fluid through small diameter coiled tubing, and high-pressure hose into the jet bit in order to achieve rock-breaking drilling effect. In order to protect oil and gas reservoirs and effectively carry rocks, it is better to add a certain amount of polymer additives in the jet medium, and the jet effect will be different from that of the pure water jet. rough the numerical simulation analysis of the polymer additive jet flow field and pure water jet flow field, the influence of polymer additive on jet rock-breaking effect is explored. e research results can guide the hydraulic parameter design of horizontal drilling
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