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在全尺寸试验架玻璃井简内进行了喷射钻头井底流场试验。试验用贴线法研究多股液流在井底场空间流动时液流方向、路线等流向分布的全貌。一个良好的井底流场应能使液流在井底场的流动满足岩屑离开井底、在井底推移岩屑和从井底举升岩屑这三个基本动作并使之配合好。试验对比了对称井底流场和不对称井底流场的特征和优缺点。试验表明:有效的利用向下冲击的高速射流;合理的安排下行液流与上返液流的“流道”并尽量控制它们相互干扰的方面,利用它们相互促进的方面;扩大和强化液体沿井底的横向流动是不对称井底流场的三个主要优点。为此,新型喷射钻头应以不对称井底流场为设计依据和发展方向。
In the full-scale test frame glass wells were jet bit bottom flow field test. The test uses the method of sticking to study the overall distribution of the flow direction, route and other flow directions when the multi-stream flows in the downhole field space. A good flow field at the bottom of the well should enable the flow of liquid at the bottom of the well to meet the three basic actions of cutting debris off the bottom of the well, removing cuttings at the bottom of the well and lifting cuttings from the bottom of the well. The characteristics and advantages and disadvantages of symmetrical bottom hole flow field and asymmetric bottom hole flow field are contrasted experimentally. Experiments show that: the effective use of high-speed jet impact down; reasonable arrangements for the downstream flow and back flow of the “runner” and try to control them interfere with each other, to take advantage of their mutual promotion; to expand and strengthen the liquid along The bottom hole horizontal flow is the three main advantages of asymmetric bottom hole flow field. To this end, the new jet bit should be based on asymmetric bottom flow field design and development direction.