A standard wear part suitable for determining the abrasiveness of rocks in oil drilling formations

Abstract

The invention relates to a standard wearing part suitable for determining the abrasiveness of oil drilling formation rocks. The technical solution is: the standard wear part is designed as a miniature core drill structure, which is composed of grinding parts and steel body connecting parts. Among them, the grinding parts are composed of phenolic resin matrix material and artificial polycrystalline diamond grinding material. The pressure process is integrated and sintered, and after processing and trimming, it is connected to the main shaft of the test device through the steel body connecting parts. Its beneficial effect is: it has reasonable wear resistance and good self-sharpening performance, and can effectively drill into rocks, and at the same time, it produces wear amount, which reflects the essence of diamond drill bit wear in the actual drilling process; The device is simple, the operation is convenient, and the technical conditions are stable. Under the conditions of simulating the dynamic grinding and rock breaking process of the diamond drill bit, the consumption of test rock samples or field cores is greatly reduced, and the test cost is saved.

Description

technical field [0001] The invention relates to the technical field of oil drilling rock-breaking tools and grinding tools, in particular to a standard wear piece suitable for determining the abrasiveness of rocks in oil drilling formations. Background technique [0002] In oil drilling, diamond drill bits are used more and more widely, and the proportion of drill bit consumption is increasing day by day. In the process of diamond bit grinding and rock breaking, dynamic friction and wear is the main wear mode of the bit, and the abrasiveness of rock has a very important influence on the wear of the diamond bit. In terms of rock abrasive test evaluation, geological and prospecting industries have done a lot of research work, while petroleum industry has done less research on this aspect. The rocks encountered in geological and prospecting engineering are mainly igneous rocks and metamorphic rocks, which have high hardness and strong abrasiveness, but the range of change is s...

AI Technical Summary

Problems solved by technology

Over the past few years, a large number of exploratory research work has been carried out on the determination method of rock abrasiveness in oil drilling formations and the selection of wear parts. Several rocks with large differences in hardness and abrasiveness have been selected, and different metals have been used as test piece materials. For the shape and size parameters of the test piece, the rock abrasive test was carried out on the modified drilling and milling machine. It was found that when the metal test piece was used for the abrasive test, the metal material was prone to adhesion. Although the test piece was worn, the worn metal debris Usually attached to the edge of the test piece, it is not easy to fall off, and the test error is relatively large; when drilling hard rocks such as granite, the test piece will slip on the rock surface and cannot eat the rock, which will easily cause the friction surface between the test piece and the rock to be polished

The wear of the metal test piece cannot reflect the essence of the wear of the diamond bit in the rock breaking process, so it is not suitable for the determination of the abrasiveness of the rock in the oil drilling formation

[0004] Then according to the theory of powder metallurgy, through experimental methods, powder materials and diamonds were selected, and wear parts were synthesized by hot pressing according to a certain formula ratio. Abrasive tests were carried out on several representative rocks of oil drilling formations, and good results were obtained. The specimen is prone to breakage and damage during the rock grinding process, and further research work is needed on the optimization of the matrix formula of the specimen, the optimization of diamond concentration and particle size, and the optimization of hot pressing process parameters.

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