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A method and device for automatically judging the connection mode between wells in fractured-vuggy reservoirs

A technology of automatic judgment and connection mode, which is applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve problems such as multiple solutions, low efficiency, ambiguity, etc., and achieve the effect of improving judgment efficiency

Active Publication Date: 2021-06-04
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that, in view of the current judging method of interwell connection mode in the prior art, which is mainly based on static data (seismic, well logging, etc.) for manual judgment, there are problems such as ambiguity, multiple solutions, and low efficiency. A method and device for automatically judging the connection mode between wells in fractured-vuggy reservoirs

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  • A method and device for automatically judging the connection mode between wells in fractured-vuggy reservoirs
  • A method and device for automatically judging the connection mode between wells in fractured-vuggy reservoirs
  • A method and device for automatically judging the connection mode between wells in fractured-vuggy reservoirs

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example

[0085] Fracture-cavity reservoirs in Tahe Oilfield are mainly karst caves and fractures-cavities, and different inter-well connectivity patterns can be obtained according to different spatial configuration relationships. The experiment took the TK634 well group of the S80 unit as an example. This well group is located in Block 6 of the Tahe Oilfield, and the production layer is the Ordovician O 1-2y , Karst caves and crevices are developed, and natural energy is abundant. The TK634 well group began to inject water on April 18, 2009, and the interwell connection mode automatic judgment algorithm was used to judge the interwell connection mode of the production wells in this well group. The results are shown in Table 1:

[0086] Table 1 Algorithm calculation results and tracer results of TK642 well group

[0087]

[0088] Judging from the oil production and water production fluctuation characteristics of the TK747 production well, the calculation results of the oil productio...

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Abstract

The invention discloses a method and device for automatically judging the inter-well connection mode of a fracture-cavity reservoir, comprising: calculating the maximum fluctuation amplitude characteristic of the production data of a production well within a period of time after water injection in a fracture-cavity reservoir based on sliding window traversal Parameters; using multi-fractal spectrum to quantify the characteristic parameters of the change degree of water production and oil production production indicators of each production well after water injection in the fracture-vuggy reservoir; based on the calculated characteristic parameters of the maximum fluctuation amplitude of production data, and production The characteristic parameters of the degree of change in oil and water production are compared with the preset threshold ranges of each parameter, so that the interwell connectivity mode of the fractured-vuggy reservoir is automatically judged as interwell fracture connectivity, interwell cave connectivity, and interwell connectivity. One of the fracture-cave composite connectivity. The invention realizes automatic judgment of inter-well connection mode for the first time, effectively improves recognition efficiency, and can guide oil reservoir production.

Description

technical field [0001] The invention relates to the field of oil reservoir engineering, and more specifically relates to a method and device for automatically judging the connection mode between wells of a fractured-cavity oil reservoir, and is especially suitable for the development of carbonate rock fractured-cavity oil reservoirs. Background technique [0002] Under multi-stage structure and karstification, fractured-vuggy reservoirs have formed storage spaces dominated by dissolved pores, caves and fractures, and the reservoirs have strong heterogeneity. According to the fracture-cavity combination and spatial configuration relationship between wells, the connection patterns between injection and production wells in fracture-cavity reservoirs are complex and diverse. According to the connectivity relationship between reservoirs, the interwell connectivity patterns in Tahe Oilfield are mainly divided into three types: vug connectivity, fracture connectivity and fracture-c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/20E21B49/00
CPCE21B43/20E21B49/00
Inventor 张冬梅邢路通胡安忠
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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