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AssigneesLanzhou Haimo Technologies Co., Ltd., Hongdi Li
InventorsHongdi Li, Jige Chen
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The present invention relates to a positron tomography imaging apparatus for a multiphase flow in an oil pipeline, which apparatus utilizes positron and electron annihilation generating a pair of coincidence gamma-rays of 511 keV energy as tomography imaging means and provides an on-line tomography imaging function for metering a multiphase flow in an oil pipeline of an oil field. The apparatus comprises a plurality of sets of parallel high-precision gamma-ray detector arrays with a particular space structure arrangement, a positron radioactive source and a shield, and can acquire a phase fraction of such multiphase flow mixture as oil, gas and water under a condition of a single radioactive source by combining an image processing function. The design of a plurality of sets of high-precision detector arrays also greatly improves accuracy of a multiphase flow metering and its applicability in multiphase flows of different flow patterns. The video information of fluid generated by it will significantly enrich oil, gas metering information for petroleum industry and provide basic data for a more effective reservoir management and production optimization.
A positron tomography imaging apparatus for a multiphase flow in an oil pipeline, comprising at least one set of probes configured to produce positron and electron annihilation and detect time-coincidence gamma ray events, wherein each set of probes comprises a pair of parallel gamma-ray detector arrays, a positron radioactive source and a radioactive source shield, wherein the pair of parallel gamma-ray detector arrays are configured to be respectively disposed on both sides of an oil pipeline under detection and perpendicular to an axial direction of the oil pipeline, the positron radioactive source configured to be located between the oil pipeline and a row of gamma-ray detector arrays in the pair of parallel gamma-ray detector arrays and parallel to the pair of parallel gamma-ray detector arrays, the radioactive source shield configured to undertake a gap shielding of the positron radioactive source in the axial direction of the oil pipeline, the pair of parallel gamma-ray detector arrays in each set of probes configured to determine a plurality of detection intervals, each of which is determined by a pair of gamma-ray detectors, wherein an average absorption coefficient of gamma-ray is acquired from each detection interval such that average absorption coefficients of different detection intervals acquired simultaneously may be used to reconstruct a tomography image of fluid.
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