A Characterization Method for Interwell Communication Channels and Flow Parameters of Fracture-vuggy Reservoirs
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A technology of flow parameters and connected channels, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of increasing the complexity of karst channel parameters and not having operational feasibility.
Inactive Publication Date: 2018-06-05
SOUTHWEST PETROLEUM UNIV
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The division of connectivity types is necessary for theoretically understanding the morphology of karst systems, but it greatly increases the complexity of calculating karst channel parameters, and is not feasible in actual calculations
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Embodiment 1
[0178] Example 1: TK221 well group.
[0179] The injection well is TK221, corresponding to 4 tracer production wells TK214, TK258, TK250CH, TK251CH during the monitoring period. From the tracer curves, well TK214 detected two independent peaks, indicating that there were two independent communication channels between wells TK221 and TK214, and the tracer curves monitored by the other three wells were all single-peak curves, indicating that each injection The communication channel between production wells is a single channel, such as figure 1 , 2 , 3,4 shown in the measured curve. The basic data used for fitting are shown in Table 1 (the data of each point on the measured trace curve are omitted)
[0180] Table 1 Basic parameters of tracer curve fitting for TK221 well group
[0181]
[0182] The well group fitting results are shown in Table 2 and figure 1 , 2 , 3,4 in the theoretical curve.
[0183] Table 2 Calculation results of connectivity parameters of TK221 well ...
Embodiment 2
[0187] Embodiment 2: TK634 well group.
[0188] The injection well is TK634, corresponding to 7 tracer production wells TK747, TK744, TK711, TK625, T7-607, S80, and TK667 during the monitoring period. The well area is an area where weathering crust is developed. From the measured trace curves, the trace curves of each well are composed of several random small wave peaks, reflecting that the flow space between injection and production wells is actually formed by many small connecting channels. Parallel channel structures such as Figures 5 to 11 The shape of the measured curve is shown in the middle.
[0189] The measured curve can be approximated as having several main peaks according to the needs of interpretation. Well TK214 detected two independent peaks, indicating that there were two independent communication channels between wells TK221 and TK214, and the tracer curves monitored by the other three wells were all single-peak curves, indicating that the communication cha...
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Abstract
The present invention relates to the technical field of reservoir description in oil field development, in particular to a characterization method for inter-well communication channels and flow parameters of fractured-vuggy reservoirs, comprising the following steps: (A) establishing a method for describing the interwell flow laws of fractured-vuggy reservoirs Analytical expression; (B) establishment of a tracer output concentration curve fitting mathematical model; (C) solution of the curve fitting model; according to the principles described in the above three steps, a tracer curve fitting software for fractured-cavity reservoirs is compiled, through The method of adjusting parameters on the software interface fits the theoretical tracer curve with the measured tracer curve, and at the same time calculates the tracer mass mik, flow velocity vik, flow area Aik, and flow tube length lik of the fracture-cavity injection, so as to realize the Characterization of connected channels and flow parameters. The model established by the present invention to describe the flow law of the tracer in the fractured-cavity reservoir is more in line with the real situation; the quantitative calculation and characterization of the interwell communication channels and flow parameters of the fractured-cavity reservoir are realized; the fitting process is automatically fitted by the computer and Staff adjustments are combined.
Description
technical field [0001] The invention relates to the technical field of oil reservoir description in oilfield development, in particular to a characterization method for inter-well communication channels and flow parameters of fracture-cavity oil reservoirs. Background technique [0002] At present, the research methods of interwell connectivity at home and abroad mainly include wireline logging, formation correlation, geochemistry, well testing, correlation analysis of injection-production well production dynamics, and tracer testing, among which the first three methods belong to static evaluation methods. For reservoir developers, more attention is paid to the dynamic connectivity between wells during reservoir development. The study of reservoir connectivity, especially the dynamic connectivity between injection and production wells, is the basic work content for comprehensively understanding the geological characteristics of reservoirs and improving reservoir recovery. ...
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