Automatic judgement method and device of fracture-cave type oil reservoir inter-well communication mode

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

Active Publication Date: 2019-12-20
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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  • Automatic judgement method and device of fracture-cave type oil reservoir inter-well communication mode
  • Automatic judgement method and device of fracture-cave type oil reservoir inter-well communication mode
  • Automatic judgement method and device of fracture-cave type oil reservoir inter-well communication mode

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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 an automatic judgement method and device of a fracture-cave type oil reservoir inter-well communication mode. The automatic judgement method includes the steps that maximum fluctuation change amplitude characteristic parameters of production data of producing wells within a period of time after water injection of a fracture-cave type oil reservoir are traversed and calculated on the basis of a sliding window; change degree characteristic parameters of production indexes, including water yield and oil production, of all the producing wells are quantified through a multifractal spectrum after water injection of the fracture-cave type oil reservoir; and the calculated maximum fluctuation change amplitude characteristic parameters of the production data and the change degree characteristic parameters of the oil production and the water yield are compared with preset threshold value ranges of all the parameters, and therefore the fracture-cave type oil reservoir inter-well communication mode is automatically judged to be one of inter-well fracture communication, inter-well cave communication and inter-well fracture-cave compound communication. By means of the automatic judgement method and device, automatic judgement of the inter-well communication mode is achieved for the first time, the recognition efficiency is effectively improved, and oil reservoir production can be guided.

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 Applications(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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