Tricone Bit Operation Technology roughly induction
At present, the oil cone bit market is no longer chaotic and has become standardized and orderly. The market competition is developing towards product function performance and quality, brand and service. As one of the two cornerstones of market competitiveness, the role of technical services for tricone drill bits will become more and more obvious.
1. Drilling parameters
钻压和转速的确定，既决定着牙轮钻头破碎岩石的效率，又影响到牙轮钻头牙齿、轴承的磨损。浅井、软地层，牙轮钻头以剪切作用为主，一般采用高转速、低钻 压。中硬地层，牙轮钻头产生剪切、冲击、压碎综合作用，一般采用中等转速和中、高钻压。深井、硬地层，牙轮钻头以压碎、冲击为主，一般采用较高钻压、低转 速。钻井参数的公道选择，很大程度上决定了牙轮钻头的失效形式。收集班报表和指重表记实，分析所用钻井参数及其变化，根据牙轮钻头失效形式确定使用的公道性。
The determination of drilling pressure and rotational speed not only determines the efficiency of rock breaking, but also affects the wear of the teeth and bearings of the tricone rock bits. In shallow wells and soft formations, the shearing action is the dominant factor of tricone drill bits, which generally adopt high rotational speed and low bit pressure. In medium-hard formation, the tricone button bit produces shear, impact and crushing effects, generally using medium speed and medium to high bit pressure. In deep wells and hard formations, tricone bits are mainly crushed and impacted, usually with high drilling pressure and low rotational speed. The reasonable selection of drilling parameters largely determines the failure mode of tricone rock drill bit. Collect shift report and weight table to record, analyze drilling parameters and their changes, and determine the fairness of use according to the failure form of tricone bit.
2. Stratigraphic Lithology
The lithology of strata is different from that of hard and soft strata, and the mechanism of rock fragmentation is different. The failure forms of cone bits are also different. Rock physical and mechanical properties of formation lithology commonly found in drilling wells of various oilfields in China have been determined. The hardness, plasticity, brittleness, abrasiveness and drillability of formation rocks are analyzed according to the formation lithology collected on site and the drilling record per meter. The selection and use of cone bits are confirmed according to the failure forms of tricone bits.
3. Wellbore structure
Different wellbore structures have special requirements for the size, type and use of cone bits. For example, inclined cone bits generally require trimming teeth or diameter-preserving structure, and require high speed and low bit pressure. Collecting the data of well structure, type selection and operation parameters of tricone button bits, confirming whether the selection and use of tricone dilling bits are fair according to the failure form of tricone bits.
4. Well section location
在地壳中处于不同位置的岩石，其岩石的机械性质变化很大。埋藏较深的岩石，处于多向压缩应力状态，使岩石孔隙减小，强度增加。上部井段一般岩石胶结松散、 质软，牙轮钻头转速高、钻压低。下部井段一般岩石质硬、研磨性大，牙轮钻头转速低、钻压高、使用时间长。根据收集的井段位置及每米岩性钻时记实，分析地层 岩石的硬度、塑性、脆性、研磨性和可钻性特点，对照牙轮钻头的失效形式，确认牙轮钻头选型及使用是否公道。
The mechanical properties of rocks in different positions in the crust vary greatly. The deep buried rock is in the state of multidirectional compressive stress, which reduces the pore size and increases the strength of the rock. In the upper section, rock cementation is loose and soft, with high rotary speed and low bit pressure. The lower section is generally hard and abrasive, with low rotary speed, high drilling pressure and long service time. The hardness, plasticity, brittleness, abrasiveness and drillability of formation rocks are analyzed according to the location of the collected interval and the record of lithologic drilling time per meter. According to the failure forms of tricone rock bits, the selection and use of cone bits are confirmed to be fair.
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