Dynamic evaluation instrument for high-temperature and high-pressure drilling fluid loss

Abstract

The invention relates to a dynamic evaluation instrument for high-temperature and high-pressure drilling fluid loss, which mainly consists of a circulating kettle, a stirring motor, a motor and temperature control system, a crack module, an intermediate container and a nitrogen source. The stirring motor is fixed on a top cover of the kettle, is hermetically connected with the circulating kettle and drives a rotating shaft and stirring blades in the circulating kettle to rotate, a gas inlet hole of the intermediate container is connected with the nitrogen source, a fluid drainage hole is connected with a fluid drainage valve of the circulating kettle, the lower portion of the circulating kettle is connected with the crack module, the crack module mainly consists of an upper column, a lower column and a heating plate, and rubber gaskets are placed in the middles of the upper and lower columns with grooves to form cracks. The dynamic evaluation instrument for high-temperature and high-pressure drilling fluid loss has the advantages that the dynamic evaluation instrument is high in automation degree and complete in function, the crack module is complete in type and large in size, drilling fluid filtering loss is monitored in real time and the like, and shortcomings that a conventional leakage stoppage device is small in size and scale, types of cracks are single, complex seam and hole loss cannot be simulated, crack wall surface filter loss cannot be tested, and positions of leakage stoppage blocking layers and permeability of the leakage stoppage blocking layers cannot be evaluated are overcome.

Description

Technical field [0001] The invention relates to large-scale experimental equipment for controlling and evaluating indoor high-temperature and high-pressure drilling fluid loss in the petroleum and natural gas industry. The equipment can simulate the loss of complex fracture-cavity formations in deep wells, monitor and record the drilling fluid loss process and its rate, and the leakage situation on the wall surface of the leakage channel. , to judge the formation position, permeability and bi-directional pressure bearing capacity of the plugging layer, which belongs to the experimental equipment for the protection of oil and gas layers in the process of oil and gas exploration and development for the loss of complex formations downhole. Background technique [0002] As oil and gas exploration and development targets are further oriented towards complex areas and deep marine formations, drilling engineering is facing multiple pressures such as increasing technical difficulty. ...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a high-temperature and high-pressure drilling fluid loss dynamic evaluation instrument for fracture-cave formations. It has the characteristics of high automation, complete functions, complete types of fracture modules and large sizes, and real-time monitoring of drilling fluid loss. The lost circulation that occurs when encountering complex formations such as fracture-cavity systems overcomes the small size of conventional plugging devices and single fracture types that cannot simulate complex fracture-cavity leakage, fracture wall leakage testing and evaluation of plugging and sealing layers Deficiencies in location and its permeability

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