Simulation device of natural fracture stratum respiratory effect and method

A technology of natural fractures and breathing effects, which is applied in indoor experiments and in the field of oil and gas industry drilling and completion. It can solve the problems of not simulating the dynamic opening and closing of fracture breathing effects, limited reference significance of breathing effects, and increasing the density of drilling fluid, etc., to achieve Improve drilling efficiency, reduce drilling risk and reduce well kick

Pending Publication Date: 2021-04-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The misjudgment of formation breathing effect and well kick may cause a series of problems: if the breathing effect is misjudged as well kick, the usual treatment method is to increase the drilling fluid density, which means that the bottom hole pressure will further exceed the formation fracture pressure and cause more serious omission
[0007] In the prior art, the experimental research on the formation breathing effect is mainly to study the characteristics of the core fractures by means of coring, and there is no simulation of the dynamic opening and closing of the fracture breathing effect in the experimental process. The breathing effect under the reference has limited significance

Method used

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  • Simulation device of natural fracture stratum respiratory effect and method
  • Simulation device of natural fracture stratum respiratory effect and method
  • Simulation device of natural fracture stratum respiratory effect and method

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Embodiment 1

[0042] Such as figure 1 and figure 2 , the present embodiment provides a simulation device for formation breathing effect of natural fractures, including a test piece and a liquid supply system, the test piece is provided with artificial fractures, and the artificial fractures start from the first end surface of the test piece to The test piece extends inside, but does not penetrate the test piece, and the liquid supply system is used to provide liquid to the artificial fracture; the test piece is set on a true triaxial testing machine, and the pressure is provided by the true triaxial testing machine .

[0043] Described test piece comprises rock core and sealing sleeve 11, and described rock core is arranged in described sealing sleeve 11; Described rock core is a cube, and artificial crack is arranged inside this cube, and artificial crack starts from an end face of rock core and extends to rock core interior, but Does not penetrate the core.

[0044] A cement sealing s...

Embodiment 2

[0051] Such as image 3 As shown, the application provides a method for simulating the formation breathing effect of natural fractures, which mainly includes the following steps:

[0052] Step 1. Based on the parameters of the simulated natural fracture formation, the initial pressure of the pressure regulating valve 5 and the back pressure valve 2 is matched with the wellbore pressure near the simulated formation;

[0053] Step 2: Start the true triaxial testing machine to pressurize the test piece, at σ 1 Applied load in the direction, matching the opening pressure of natural fractures, at σ 2 The load is applied in the direction of , matching the simulated formation confining pressure, at σ 3 The load is applied in the direction to match the simulated formation pore pressure;

[0054] Step 3. Turn on the hydraulic pump 6 to inject liquid until the pressure gauge 4 shows no significant change, adjust the pressure regulating valve 5, and gradually increase the hydraulic pr...

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Abstract

The invention discloses a simulation device of a natural fracture stratum respiratory effect and a method, and relates to the technical field of indoor experiments in the technical field of petroleum and natural gas industrial drilling and completion. The simulation device comprises a test piece and a liquid supply system, wherein an artificial fracture is arranged in the test piece and extends into the test piece from the first end face of the test piece, but does not penetrate through the test piece, the liquid supply system is used for supplying liquid to the artificial fracture, and the test piece is arranged on a true triaxial testing machine, and pressure is provided by the true triaxial testing machine. According to the experimental device and the implementation mode, experimental research and quantitative analysis are carried out on the respiration benefits of the natural fracture stratum under the condition of restoring real stratum conditions, technical reference can be provided for a deepwater well when drilling meets the natural fracture stratum, understanding of the respiration effect is enhanced, well complex conditions such as well kick and well leakage caused by misjudgment of the respiratory effect are reduced, the drilling cost is saved, the drilling efficiency is improved, and the drilling risk is reduced.

Description

technical field [0001] The invention relates to the technical field of laboratory experiments in the technical field of oil and gas industry drilling and completion, in particular to a simulation device and method for natural fracture formation breathing effects. Background technique [0002] With the development of the oil and gas industry, the demand for oil and gas continues to increase. Conventional onshore oil and gas development can no longer meet the demand. Oil and gas exploration and development are developing towards deep land complex formations and deep water. In these areas, complex formation environments will bring a series of drilling operations. Technical difficulties, the formation breathing effect caused by the narrow operating window is one of the common downhole complex situations, and the safety drilling problems caused by the breathing effect are becoming more and more prominent. [0003] In deep land formations and deep water fields, complex geological ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 李昊李秉轩孙宝江殷志明王志远高永海施程振
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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