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Method for reversely deducing original oil-water interface by dynamic and static combination of fracture-vug carbonate reservoir

A carbonate reservoir, oil-water interface technology, used in earth-moving drilling, wellbore/well components, measurement, etc.

Active Publication Date: 2021-02-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are certain limitations in identifying the original oil-water contact in fractured-cavity reservoirs characterized by "one cave and one reservoir" using the current oil-water contact identification method

Method used

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  • Method for reversely deducing original oil-water interface by dynamic and static combination of fracture-vug carbonate reservoir
  • Method for reversely deducing original oil-water interface by dynamic and static combination of fracture-vug carbonate reservoir
  • Method for reversely deducing original oil-water interface by dynamic and static combination of fracture-vug carbonate reservoir

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Experimental program
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Embodiment approach

[0067] As a preferred embodiment of the present invention, the verification of the original oil-water interface in the entire area to be tested includes:

[0068] Comprehensive analysis of reservoir acid fracturing knowledge, well completion test data analysis, production logging data knowledge and development dynamic data knowledge to obtain the oil-water characteristics of fracture-vuggy reservoirs; according to the oil-water characteristics of the fracture-cavity reservoirs, the original oil-water The interface is verified to achieve a consistent understanding of multiple information to guide development and production.

[0069] Those skilled in the art should understand that the comprehensive analysis of reservoir acid fracturing knowledge, completion test data analysis, production logging data knowledge and development dynamic data knowledge described in the present invention to obtain the oil-water characteristics of fractured-vuggy reservoirs is a conventional technical ...

Embodiment 1

[0072] This example provides the application of a method of back-estimating the original oil-water contact in fractured-cavity carbonate reservoirs based on dynamic and static methods in the fracture-cavity body of the X11—X11-2 connected well group in the Halahatang Oilfield (Halahatang The oilfield is located in the middle of the Tabei uplift in the Tarim Basin, on the slope of the Lunnan-Yingmaili buried hill anticline. The Paleozoic Ordovician oil reservoir is a karst-fracture composite reservoir formed by multi-stage karst and tectonic activities. "One hole, one hiding" feature), including the following steps:

[0073] 1) The geological model of the X11—X11-2 well group is established by using the multi-type and multi-scale fracture-cavity carbonate reservoir geological modeling method, as shown in figure 2 shown;

[0074] 2) According to the geological model obtained in step 1), using the static model three-dimensional grid integration method, the static reservoir volu...

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Abstract

The invention discloses a method for reversely deducing original oil-water interface by dynamic and static combination of fracture-vug carbonate reservoir. The method comprises the following steps: 1)establishing a single well or connected well group geological model; 2) determining the volume of a static reservoir body; 3) determining the volume of dynamic oil and the volume of a dynamic reservoir body; 4) judging whether the volumes of the dynamic and static reservoirs meet preset conditions or not, if not, repeating the steps 1) and 2) until the volumes meet the preset conditions, and entering a step 5); 5) setting an oil-water interface to obtain a static oil volume; 6) judging whether the dynamic and static oil volumes meet preset conditions or not, if not, repeating the step 5), anddetermining an original oil-water interface; 7) applying the method to other single wells or communicated well groups to obtain a whole-area original oil-water interface; and (8) judging whether thewhole-area original oil-water interface meets a preset condition or not, if not, repeating the steps (1)-(7), and determining the whole-area original oil-water interface. The invention creatively discloses a dynamic and static combination original oil-water interface reversely deducing method, and provides reference for original oil-water interface identification research.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development. More specifically, it relates to a method for back-estimating the original oil-water contact in a fractured-cavity carbonate reservoir by combining static and dynamic dynamics. Background technique [0002] At present, scholars at home and abroad have identified research methods for oil-water contact in reservoirs, mainly including core section analysis, dynamic data, logging interpretation, oil testing, geochemical measurement and other direct methods, as well as formation pressure estimation, capillary pressure, etc. Prediction method, seismic attribute analysis method, water breakthrough time-fluid production depth intersection method, karst remnant hill topography method and other indirect methods. [0003] Due to the complex geological characteristics of karst fracture-cavity reservoirs, the conventional direct method to identify the oil-water contact requires ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20E21B49/00E21B47/00
CPCE21B49/00E21B47/00
Inventor 邓晓娟李勇周代余王琦赵宽志张琪张晶
Owner PETROCHINA CO LTD