Mountain geophysical prospecting operations play an important role in the entire petroleum exploration field. Geophysical drill-bit is the main tool for mountain geophysical prospecting operations. Its hydraulic structure directly affects the downhole flow field and then affects the chip removal efficiency and drilling efficiency of the bit. At present, most of the scholars’ research is focused on Poly Diamond Crystalline bit, roller bit, etc., and the research on geophysical drill-bit is less, and most of them study the downhole flow field based on the change of single hydraulic structure. The primary objective of this research is to study the variation law of the downhole flow field under the interaction of multiple hydraulic structure factors. The drilling time and cuttings size of two geophysical drill-bits with different hydraulic structures are compared, and the key hydraulic structure factors are selected for analysis. Using numerical simulation software, take different levels of key hydraulic structure parameters and carry out orthogonal experiments. Under the interaction of various factors, study the flow field distribution in the flow channel, the downhole, and the annulus area of the shaft lining. The hydraulic structure of the geophysical drill-bit is closely related to the drilling speed and chip removal efficiency. When multiple hydraulic factors are changed, the diameter of the flow channel is the best when it is 10–12.5 mm, the inclination of the flow channel should be set as close as possible to the center of the downhole, and the length of the chip groove increases, the movement of cuttings is more stable. Variation law of downhole flow field under the interaction of multiple hydraulic factors is studied. This study provides a basis for the hydraulic structure design and optimization of the geophysical drill-bit.

山地物探作业在整个石油勘探领域发挥着重要作用。物探钻头是山地物探作业的主要工具。其水力结构直接影响井下流场，进而影响钻头的排屑效率和钻进效率。目前，学者的研究大多集中在聚金刚石结晶钻头、牙轮钻头等方面，对地球物理钻头的研究较少，大多是基于单水力变化来研究井下流场。结构。本研究的主要目的是研究多种水工结构因素相互作用下井下流场的变化规律。比较了两种不同水工结构物探钻头的钻进时间和岩屑尺寸，并选取关键水工结构因素进行分析。利用数值模拟软件，采取不同级别的关键水工结构参数，进行正交试验。在各种因素的相互作用下，研究流道、井下、井壁环空区域的流场分布。物探钻头的水力结构与钻进速度和排屑效率密切相关。当多个水力因素变化时，流道直径在10~12.5 mm时最佳，流道倾角应尽可能靠近井下中心，切屑长度沟槽增大，岩屑运动更稳定。研究多种水力因素相互作用下井下流场的变化规律。该研究为地球物理钻头的水工结构设计和优化提供了依据。