A gas lift positive circulation drilling mixer

Abstract

The invention relates to the technical field of gas lift positive circulation drilling, in particular to a mixer for gas lift positive circulation drilling. The mixer comprises a joint body, an inner core, bridge-type outer floral pipes, convex blocks and a conversion joint. The inner core is arranged in an inner cavity of the joint body; annular gaps are formed between the inner core and the inner wall of the joint body; the outer side wall of the joint body is wrapped with the bridge-type outer floral pipes; and the convex blocks are fixed at one ends of the bridge-type outer floral pipes. Bridge holes with bulges in the middles are formed in the outer surfaces of the bridge-type outer floral pipes. Bridge hole cutting seams capable of jetting flow in two ways are formed between the bridge holes and the bridge-type outer floral pipes. Vent holes are formed in the side wall, wrapped with the bridge-type outer floral pipes, of the joint body in a penetrating mode. The end machined with an outer thread of the joint body is sleeved with the conversion joint in a threaded fit mode. According to the mixer, the direct impact of a high speed air flow to the hole wall of a well drilling can be effectively prevented, the bridge-type outer floral pipes can be easily disassembled and conveniently replaced, and the structure is simple and effective.

Description

Technical field [0001] The invention relates to the technical field of gas lift positive circulation drilling, in particular to a mixer for gas lift positive circulation drilling. Background technique [0002] Gas-lift positive circulation drilling technology is a research content of the special mining technology research project of large-diameter geothermal wells. The project mainly summarizes the application of gas-lift positive circulation drilling technology in the construction of large-diameter geothermal wells, and compares and analyzes conventional large-diameter wells. Geothermal well construction technology. [0003] Gas-lift positive circulation drilling has high efficiency, especially in the lost zone. The positive circulation process has serious mud leakage and drilling cannot be carried out; when the gas lift reverse circulation process is insufficient in groundwater supply, it will also cause slurry supplementation. , Leading to problems such as interruption of drill...

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Problems solved by technology

[0005] The gas-lift positive circulation mixer is a key component to realize the gas-lift positive circulation. Its structural performance is crucial to the test of the project, but the mixer in the prior art has the following defects: 1. The high-speed compressed air flow out of the mixer 2. The mixer needs to be connected with the single-wall drill pipe. Since the single-wall drill pipe has different types, it is also necessary to manufacture a variety of sizes corresponding to the single-wall drill pipe. Different joint bodies of mixers are very troublesome and waste resources

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