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Tricone Bit Operation Technology Roughly Induction

Jul 16, 2019

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

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

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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