Application method for explaining karst cavity characteristics of karstic-fault oil reservoir
An application method and technology of karst caves, applied in special data processing applications, constraint-based CAD, design optimization/simulation, etc., can solve problems such as uncertain size, number and distance of cracks and caves
Active Publication Date: 2022-01-11
CHINA PETROLEUM & CHEM CORP +1
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The parameters such as permeability, storage volume ratio and channeling coefficient interpreted by conventional well testing are only the average value of the parameters of fractures, matrix and caves in the formation, and cannot determine the size, number and distance of fractures and caves, which directly serve the development of fault-karst oilfields. parameter
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[0071] The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. Herein, various embodiments may be referred to individually or collectively by the term "invention", which is for convenience only and is not intended to automatically limit the scope of this application if in fact more than one invention is disclosed. A single invention or inventive concept. Herein, relational terms such as first and second etc. are used only to distinguish one entity or operation from another with...
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The invention discloses an application method for explaining karst cavity characteristics of a karstic-fault oil reservoir, and relates to the field of oil and gas resource development. The method comprises the following steps: constructing a well-hole theoretical physical model according to karst cave characteristics of a karstic-fault oil reservoir; in combination with fluid actual flowing characteristics, introducing a fluctuation coefficient and the damping coefficient to construct a mathematical model; performing dimensionless processing and calculation to obtain a dimensionless calculation formula of the fluctuation coefficient and the damping coefficient and obtain a radius and a height representing karst cavity characteristics; performing fitting calculation according to the radius and the height, and obtaining karst cavity volume characteristics; determining whether a karst cavity is a near-well karst cavity or a far-well karst cavity according to the mutual relation between the karst cavity volume characteristics and mine field actual data. A reservoir transformation measure of the near-well karst cavity is acidification; a reservoir transformation measure of the far-well karst cavity is acid fracturing. The invention provides a method which is close to the actual characteristics of a mine field and can effectively represent and explain the karst cavity volume characteristics of an oil reservoir, and a new means is provided for the description of karst cavities of a fractured-vuggy oil reservoir.
Description
technical field [0001] The invention relates to the field of oil and gas resource development, in particular to an application method for explaining the characteristics of caves in fault-karst reservoirs. Background technique [0002] The geological characteristics of fractured-vuggy carbonate reservoirs in the Shunbei, Yuejin and Tarim Basins are very complex, with strong heterogeneity, uncertain reserves and complex seepage mechanism. The hydrodynamic characteristics and seepage characteristics of different fracture-vuggy units are very different, and the development is difficult and risky. For example, the performance of different reservoirs in the same reservoir is quite different, resulting in the coexistence of high-yield and low-yield wells, or even no productivity wells; each fracture-vuggy system unit is an independent reservoir, and the units are not connected or connected poorly , often resulting in the phenomenon that the adjacent wells of the water injection we...
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IPC IPC(8): G06F30/20G06F111/04G06F111/10
CPCG06F30/20G06F2111/04G06F2111/10
Inventor 胡文革赵海洋马国锐徐燕东李冬梅宋海邹宁李丹丹陶杉潘丽娟李渭亮黄传艳
Owner CHINA PETROLEUM & CHEM CORP
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