Natural gas exploitation simulator of multi-angle horizontal branch well

Abstract

The invention relates to a natural gas exploitation simulator of a multi-angle horizontal branch well, which is applied to a special physical simulation test of an unconventional natural-gas development horizontal well. The natural gas exploitation simulator is characterized in that: a multi-angle branch well model comprises a main pipe and branch pipes, wherein 4 to 12 branch pipes are welded on the main pipe and communicated with the main pipe, and an included angle between the central line of the branch pipes and the central line of the main pipe is within 25 to 65 degrees, and the length of each branch pipe is within 500 to 1000mm; a main pipe seal head is fixed at the liquid outlet end of the main pipe; end covers are arranged at the liquid inlet ends of the branch pipes and the main pipe, a pipeline and an injection pump are connected to each end cover, a flowmeter and a valve are serially connected to the pipeline, and a pressure sensor is also connected to the pipeline. The invention has the advantages of simulating technical parameters of exploitation fluids in multi-angle and multi-branch wells, researching the formation sand production situation and a sand washing process in the horizontal branch well exploitation process of unconventional natural gas and providing basic parameters of formation pressure distribution, water drainage and gas production systems, and the like for the unconventional natural gas exploitation.

Description

technical field [0001] The invention relates to the technical field of natural gas development in the petroleum and natural gas industry. In particular, it relates to an indoor simulation device for natural gas exploitation, which is a special physical simulation device for unconventional natural gas development horizontal wells. Background technique [0002] At present, unconventional natural gas is a kind of unconventional natural gas that is controlled by structures and has accumulated in large areas. At present, the main types of unconventional natural gas are shale gas, coalbed methane and tight gas. Horizontal branch well is an effective means to develop unconventional gas fields, and it can significantly improve the comprehensive benefits of exploration and development of unconventional gas reservoirs. Since the world's first horizontal well was drilled in 1928, horizontal well technology has developed rapidly and increased at a rate of 3000-5000 horizontal wells per...

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Problems solved by technology

The application of horizontal well technology has been started in various oilfields. During the production of horizontal branch wells, the characteristics of sand production in the formation and the technology of sand flushing and well washing are very different from those in vertical wells. This not only reflects the increase in operational difficulty, but also restricts The formulation of technical measures and the effect after construction operation are mainly due to the fact that there are four types of wellbores in a horizontal well: vertical section, build-up section, horizontal section, and branch section. The complex relationship between the direction of the horizontal branch wellbore affects the existence form and flow migration law of the medium in the horizontal wellbore. In addition to the complex trajectory of the horizontal well section, the number of perforation holes that need to be perforated is large, the perforation orientation is variable, and the perforation distribution is different. , as well as the liquid injection process and operation method, etc. have increased the difficulty of horizontal well sand flushing; however, most of the current horizontal well sand flushing processes use empirical methods, that is, while observing, exploring, and improving. In this case, it is difficult to optimize the process technology without scientific and quantitative technology; from the technical literature query, although foreign countries have a long history of research on horizontal well technology, the relevant horizontal branch There is no technical literature on wellbore sand flushing

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