At present, the tricone bit market is no longer chaotic and has become standardized and orderly, and the market competition is developing in the direction of product differentiation, reputation and after-sales service. One of the two cornerstones of market competitiveness, the role of tricone bit technical services will become more and more obvious.
The determination of WOB and rotational speed not only determines the rock crushing efficiency of the tricone bit, but also affects the wear of the teeth and bearings of the tricone rock bit. In shallow wells and soft formations, the tricone bit is mainly used for shearing action, and generally high speed and low WOB are used. In medium-hard formations, the three-cone bit produces a comprehensive effect of shearing, impacting and crushing. Generally, medium speed and medium and high WOB are used. In deep wells and hard formations, the tricone bit is mainly crushed and impacted, and generally higher WOB and low rotational speed are used. Reasonable selection of drilling parameters largely determines the failure mode of the tricone bit. Collect class reports and weight table records, analyze the drilling parameters used and their changes, and determine the rationality of use according to the failure mode of the tricone bit.
The lithology and hardness of the formation are different, the rock crushing mechanism is different, and the failure forms of the tricone bit are also different. The common formation lithology in drilling in various oilfields, and its petrophysical and mechanical properties are all measured. Carry out the analysis of the hardness, plasticity, brittleness, abrasiveness and drillability of the formation rock, and compare the failure mode of the tri-cone bit to confirm whether the selection and use of the tci tricone drill bit are reasonable.
Rocks in different locations in the Earth's crust vary widely in their mechanical properties. The deeply buried rock is in a state of multi-directional compressive stress, which reduces the rock porosity and increases its strength. The rock in the upper well section is generally loosely cemented and soft, with high rotational speed of the tricone bit and low WOB. The lower well section generally has hard rock, high abrasiveness, low rotational speed of the tricone bit, high WOB, and long service time. According to the collected well section position and lithology drilling time records per meter, analyze the hardness, plasticity, brittleness, abrasiveness and drillability characteristics of formation rock, and confirm the selection of tricone bit according to the failure mode of tricone bit and whether it is fair to use. Get more information from tricone bit manufacturers.
Different wellbore structures have requirements on the size, model and use of the tricone bit. For example, the tri-cone drill bit generally requires trimming teeth or a gauge structure, and the use requires high speed and low drilling pressure. Collect data such as well structure, selection of roller cone bits, operating parameters, etc., and confirm whether the selection and use of tri-cone bits are reasonable according to the form of failure of the three-cone bit.