Processing method and mold of ring-type diamond composite wear-resistant belt

Abstract

The invention discloses a machining method of a ring type diamond composite anti-abrasion belt and a mould. The mould comprises an upper mould, a lower mould and a sand core, wherein the sand core is concentrically arranged in the lower mould and sleeved with a first sleeve, the bottom of the first sleeve is provided with an outer edge, a second sleeve is arranged on the outer side of the first sleeve and above the outer edge, and an annular gap where a plurality of block-shaped polycrystalline diamonds are arranged is formed between the second sleeve and the first sleeve; a set of sleeve ring body arranged on the outer side of the sand core is fixedly arranged above the annular gap and located at the top of the first sleeve; the upper mould is an annular container clamped above the lower mould, and a through hole is formed in the bottom surface of the container. The machining method includes the steps of powder stirring, cleaning, block adhesion, assembly, sintering, machining and the like. Machining of the ring type diamond composite anti-abrasion belt and optimized and orderly distribution of the block-shaped polycrystalline diamonds in the anti-abrasion belt are realized, the machining quality and efficiency of the anti-abrasion belt are improved, and the machining cost is reduced. The machining method is convenient to operate and saves time and labor, and the diamonds are high in distribution quality and forming efficiency.

Description

technical field [0001] The invention relates to a manufacturing technology of a drilling tool for oilfield drilling, in particular to a processing method and a mold for a ring-type diamond composite anti-wear belt. Background technique [0002] At present, conventional anti-wear belts for drill pipe joints can prevent wear of drill pipe joints and protect casings in simple well structure and generally abrasive formations, but in highly abrasive formations or complex well structure In wells, the wear resistance of conventional anti-wear belts can no longer meet the requirements of the service conditions, the drill pipe joints are severely worn, and the life of drill pipes is significantly reduced; at the same time, the wear and tear of conventional anti-wear belts on the casing is still serious. In view of the defects of the above-mentioned known technologies, a diamond composite material drill pipe joint anti-wear belt has been successfully developed. The wear-resistant belt...

AI Technical Summary

Problems solved by technology

The heat-resistant temperature of block polycrystalline diamond can reach up to 1200°C, while the sintering temperature of hot pressing method is generally above 1200°C, which has a serious impact on the performance and life of diamond; the synthesis pressure of hot pressing method is generally 15-18Mpa , Micro-cracks are prone to appear on the surface of the diamond, which will affect the normal use of the material. In severe cases, the diamond will be damaged or collapsed; and the hot pressing method cannot realize the optimized and orderly arrangement of the block polycrystalline diamond, which must be artificially arranged and then sintered. The arrangement of the diamonds will also be disordered due to excessive pressure. If the block polycrystalline diamonds are randomly or disorderly distributed in the wear-resistant belt, the block polycrystalline diamonds will cause inconsistent wear of the polycrystalline diamonds due to uneven force. , and sharp edges and corners appear, which will cause serious wear of the casing, and the anti-wear belt is also prone to peeling off and failing

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