A method for establishing a well periphery crack network model
A technology of fracture network and establishment method, which is applied in the field of establishment of fracture network models around wells, can solve problems such as difficult description of formation fracture characteristics, complex spatial flow of formation fractures, etc. Rock Sampling Cost, Feasibility, and Practicality High Effects
Inactive Publication Date: 2019-06-14
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
However, the downhole problems caused by the existence of fractures have not been well resolved. Through analysis, it can be seen that the root causes of the problems in the drilling process of fractured formations are the difficulty in describing the characteristics of formation fractures, the complexity of the spatial flow of formation fractures, etc.
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[0038] Taking the formation of Jialingjiang Formation in Well X in the Yuanba area of Northeast Sichuan as an example, the fracture network model around the well was established. It mainly includes the following steps:
[0039] S1 Determining the stratum level of Jialingjiang Formation in Well X in the Yuanba area of Northeast Sichuan and collecting corresponding regional geological data;
[0040] S2 Search for outcrops of the Jialingjiang Formation strata in the vicinity of the Yuanba area, conduct field outcrop observations, and analyze the characteristics of outcrop fracture networks;
[0041] On the basis of step S2, S3 collects drilling data in the Yuanba area of Northeast Sichuan;
[0042]S4 collected rock samples from the outcrop of the Jialingjiang Formation, and carried out experiments to obtain rock mechanical parameters;
[0043] S5 scans the collected rock samples in 3D, obtains the 3D point cloud data of the fracture surface of the rock sample, and obtains...
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The invention discloses a method for establishing a well periphery crack network model. The method comprises the following steps: S1, determining a stratum position of a research area and collecting regional geological data; S2, finding outcrop of a corresponding stratum in an adjacent region of the research region, and analyzing outcrop crack network characteristics; S3, collecting well drillingdata of the research area; S4, collecting a rock sample at the outcrop of the corresponding stratum, and carrying out a rock mechanical parameter acquisition experiment; S5, acquiring three-dimensional point cloud data of the rock sample fracture surface, and solving three-dimensional characteristic parameters of the fracture surface; S6, setting a parameter synthesis stratum crack digital crack surface in the digital synthesis software, and processing the point cloud data by adopting a reverse engineering method to generate a crack curved surface model; and S7, combining the outcrop fracturenetwork characteristics of the stratum corresponding to the research area, importing the rock mechanical parameters into the model, returning the model to the underground environment, and establishinga well periphery fracture network model. The well periphery crack network model established by the invention not only accords with stratum conditions and crack characteristics, but also can be used for analyzing by a modern simulation method, and has a wide application prospect.
Description
technical field [0001] The invention relates to the field of oil and gas geology and development, in particular to a method for establishing a fracture network model around a well. Background technique [0002] In recent years, with the continuous deepening of oil and gas exploration and development, the proportion of fractured reservoirs in the discovered oil and gas reserves has gradually increased, and the proportion of proven reserves and production has also increased, and the study of formation fractures has received increasing attention. Fractured reservoirs are generally buried deep and the distribution of fractures is complex, which makes the geological conditions of the reservoir complex and brings many problems to petroleum exploration and development. Due to the existence of fractures, there will be multiple pressure systems in the same well section, resulting in frequent drilling fluid leakage problems during the drilling process, and the drilling fluid entering ...
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IPC IPC(8): G06F17/50G06T17/05
Inventor 李皋谢强李睿胡强许明于鑫
Owner SOUTHWEST PETROLEUM UNIV