Method for evaluating connection relation between oil wells

Abstract

The invention discloses a method for evaluating the connection relation between oil wells, and belongs to the technical field of oil-gas field development. The method is characterized by comprising the following steps: field sampling; sample pretreatment; DNA extraction and polymerase chain reaction (PCR); high-throughput sequencing and community structure analysis; clustering analysis; oil well connectivity judgment. The judgment results are as follows: (1) if the judged clustering distance is 0-5, the oil well connectivity is good; (2) if the judged clustering distance is 5-10, the oil well connectivity is general; (3) if the judged clustering distance is 10-20, the oil well connectivity is poor; (4) if the judged clustering distance is 20-25, the oil wells are not connected. The method is high in accuracy and wide in oil deposit application range; through adoption of the method, the connection relation between the oil wells can be accurately judged, so as to provide real-time oil deposit connectivity information for oil injection transfer; the cost is low, the method is simple, addition of any reagent to an oil deposit is not needed, and normal production of the oil wells is not impacted; environmental pollution and the follow-up water treatment problem are avoided. Therefore, the method can be widely applied to judgment of the connection relation between the oil wells.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a method for evaluating the connection relationship between oil wells. Background technique [0002] In oilfield development, reservoir connectivity is an important content of reservoir description, and it is also the basis of oilfield development and management plans. Understanding the connectivity of oil wells is important for studying the spatial distribution of reservoirs, accurately calculating reservoir reserves, and compiling reasonable development. The adjustment plan has very important significance; the main body of the complex fault block oil field is the fault block oil reservoir. The fault block oil reservoir controlled by the fault cutting is different due to the different combination of faults and the different reservoir geometry. The opening degree of the outside world is obviously different. Understanding the connection relationship be...

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Problems solved by technology

[0003] Reservoir connectivity can be measured by methods such as well testing, tracer testing, and reservoir numerical simulation. These methods can reflect the connectivity between wells to a certain extent, but they all have their own limitations. Tracer Testing and well testing methods are difficult to implement on site, will affect the normal operation of oilfield production, and are expensive; numerical simulation methods need to master the static data and dynamic data of the oil layer, and these parameters must be fully prepared and truly in line with the actual conditions of the reservoir. is very difficult

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