Physical modeling experiment system and method for oil deposit karst cave collapse and crack closure

A technology of closure process and physical model, which can be used in earth-moving drilling, wellbore/well components, etc., and can solve the problems of inability to simulate the collapse of caves and fracture closure in oil reservoirs.

Active Publication Date: 2015-08-05
SHANDONG UNIV
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Problems solved by technology

This device is mainly used for water flooding experiments and cannot simulate the process of reservoir cave collapse and fracture closure

Method used

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  • Physical modeling experiment system and method for oil deposit karst cave collapse and crack closure
  • Physical modeling experiment system and method for oil deposit karst cave collapse and crack closure
  • Physical modeling experiment system and method for oil deposit karst cave collapse and crack closure

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] figure 1 It is a schematic structural diagram of a physical test device for simulating the process of cave collapse and fracture closure caused by oil production. It consists of an oil injection pressure device 1, an oil production depressurization device 2, a pressure transmission device 3 in caves and fractures, and a human-computer interaction control system 4 composition. The internal pressure transmission device in the cave is connected to the oil production depressurization device 2 and the oil injection pressurization device 1 respectively through the high pressure oil pipe 13; The motor 6 is connected to the high-precision pressure sensor 11 and the normally closed solenoid valve 12 in the oil extraction and pressure reduction device 2; The inner wall of the hole 16. Among them, the oil injection pressurization device 1 is used to prov...

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Abstract

The invention discloses a physical modeling experiment system and method for oil deposit karst cave collapse and crack closure. The physical model experiment system comprises three-dimensional geomechanics modeling experiment bed. A three-dimensional geological model is made through bedded-earth rolling in the three-dimensional geomechanics modeling experiment bed by adoption of materials similar to the model. A karst cave and a crack which are reserved for the model and fits with the dimension of a cave-crack internal pressure force-transmitting device are reserved in the three-dimensional geological model. The cave-crack internal pressure force-transmitting device is arranged in the karst cave and the crack reserved for the model and tightly close to the walls of the karst cave and the crack reserved for the model. The cave-crack internal pressure force-transmitting device is respectively connected with an oil-extraction decompression device and an oil-injection pressure device which are arranged outside the three-dimensional geomechanics modeling experiment bed through a high-pressure oil pipe. A man-machine interaction control system is respectively connected with a solenoid valve set, an intelligent sensor and a servo motor which are arranged in the oil-injection pressure device and a high-precision pressure sensor and a normally closed type solenoid valve which are arranged in the oil-extraction decompression device through a shielded wire. The invention further discloses an experiment method for the physical modeling experiment system.

Description

technical field [0001] The invention relates to a physical model test system and method for simulating the process of reservoir karst cave collapse and fracture closure during oil production. Background technique [0002] At present, carbonate oil and gas reservoirs are widely distributed around the world. According to statistics, 40% of the world's large oil and gas fields are carbonate oil and gas reservoirs, and more than 30% of the carbonate oil reservoirs are fracture-cavity oil reservoirs. In my country, the fracture-vuggy reservoirs account for 2 / 3 of the proven carbonate reservoir reserves, and they will be the main areas for increasing reserves in the future. The reservoir space of fracture-cavity reservoirs is mainly composed of two basic structures, caves and fractures. Among them, caves are the main storage space, and fractures mainly serve as the communication between caves. However, in the process of oil production, as the oil is continuously produced, the form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 张强勇向文张岳王超
Owner SHANDONG UNIV
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