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Experimental evaluation method of gas-injection displaceable oil of fracture-cave type carbonate reservoir

A carbonate rock reservoir and evaluation method technology, applied in the field of oil and gas exploration and development, can solve the problem of no test evaluation method and the like

Inactive Publication Date: 2013-01-30
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

This technology requires real crude oil and injected gas samples, high temperature and high pressure conditions, and involves the production technology of fracture-cavity units. At present, there is no corresponding test and evaluation method

Method used

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  • Experimental evaluation method of gas-injection displaceable oil of fracture-cave type carbonate reservoir
  • Experimental evaluation method of gas-injection displaceable oil of fracture-cave type carbonate reservoir
  • Experimental evaluation method of gas-injection displaceable oil of fracture-cave type carbonate reservoir

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Embodiment Construction

[0058] The present invention is further illustrated below according to examples.

[0059] The experimental evaluation method of gas injection for oil replacement in fracture-cavity carbonate reservoirs includes the following steps in sequence:

[0060] (1) To make a fracture-cavity carbonate core model, select a square carbonate core with a size of about 30cm, artificially create a natural single fracture, and use a 4-inch diameter drill to drill the core to make a hole. The hole cannot be penetrated. Through the edge and end face of the core, the core is placed vertically, and the top and bottom of the core are connected by cracks, forming a combined model in which a natural single fracture cuts all the holes from top to bottom;

[0061] (2) Prepare formation crude oil samples and injected gas, and set the pressure point p for gas injection 1 and the pressure point p at which the gas injection ends 2 ;

[0062] (3) Restoring the original state of the core, saturating the c...

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Abstract

The invention relates to an experimental evaluation method of gas-injection displaceable oil of fracture-cave type carbonate reservoir. The method comprises the following steps in sequence: (1) making a fracture-cave type carbonate core model; (2) preparing an in-place oil sample and injected gas, and setting a pressure point p1 for gas injection and a pressure point p2 for gas injection termination; (3) recovering the original state of the core; (4) carrying out an exhaustion experiment from the top end of the core; (5) carrying out the gas-injection displaceable oil experiment for a plurality of times from the top end of the core at the formation temperature; and (6) calculating development indexes (of the gas injection displaceable oil experiment) such as the recovery efficiency of the raw oil, the gas-oil ratio, the gas-water ratio, and the like. By making a physical single fracture plane overall-diameter fracture-cave core model which keeps the completeness of the core, an experimental testing method for physical gas injection displaceable oil simulation is established, and a tool and a means for evaluating the recovery effect of the fracture-cave type carbonate is provided.

Description

technical field [0001] The invention relates to an experimental evaluation method for improving crude oil recovery by injecting gas instead of oil in a fracture-cavity single well unit reservoir in the field of petroleum and natural gas exploration and development. Background technique [0002] The oil-water relationship in fractured-cavity carbonate reservoirs is complex, and the well layout method is different from that of ordinary sandstone reservoirs. For the case of a single well unit where the oil production well is located in the middle and lower part of the fracture-vug unit, the crude oil at the upper end of the fracture-vug unit is not easy to be recovered during depletion production. In addition, some fractured-vuggy carbonate single-well unit reservoirs have entered high rounds of water injection for oil replacement, and the oil-water contact has continued to rise, and the remaining oil is mainly distributed in the middle and high parts of the unit, so it cannot ...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B49/00
Inventor 郭平张中伟汪周华蒙春郭彦君彭松景莎莎
Owner SOUTHWEST PETROLEUM UNIV
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