Simulation fracture plugging test device and test method

Abstract

The invention relates to a simulation fracture plugging test device and a test method used in drilling operation in oil-gas fields, which can estimate fracture plugging materials with longer fracturedepth and a plugging drilling fluid or completion fluid system, and truly reflect the plugging effect of fracture leakage loss with depth. The test device consists of a fracture test module and a highpressure container. The technical scheme thereof is as follows: the upper end of the high pressure container is provided with an O-shaped seal ring of the high pressure container; the top part of anupper cover is provided with a needle check valve; the needle check valve is connected with the quick joint of the high pressure gas pipe of a nitrogen bottle; the high pressure container is connectedonto an upright post by a bottom cover and a bottom cover connecting flange; the fracture test module is located by a module locating sleeve, and is fixed by a module connecting fastening bolt; and aplugging fluid outlet pipeline is connected with a plugging fluid outlet connecting flange. The invention has the advantages of reasonable simulation fracture structure, stable and reliable high pressure sealing and working, convenient operation of test device, and the like, and can provide important test device and research method for customizing a production field plugging scheme.

Description

Technical field: [0001] The invention relates to a simulated fracture plugging test device and a test method for the study of fractured leakage and plugging in oil and gas field drilling operations, and is especially suitable for simulating underground fractures with deep depths for plugging material evaluation and plugging drilling fluid, completion Research on plugging effect, mechanism and formula of well fluid and other oil and gas well working fluids. Background technique: [0002] Lost circulation is a common and often encountered complex engineering situation in the process of oil and gas drilling. The complex downhole conditions caused by it and other various downhole vicious accidents induced by it are extremely harmful to drilling and completion projects. It has always been a domestic It is a matter of great concern to foreign petroleum engineering circles. However, due to its complex reasons and many restrictive factors, it has become a major technical problem th...

AI Technical Summary

Problems solved by technology

At present, the API indoor static plugging evaluation test device is commonly used in China. Due to the unreasonable position and structure of the leakage bed and the slit plate, the device cannot truly simulate the situation that the cracks in the leakage formation have a certain depth, so a new method is proposed. Urgent request: Can research and design a brand-new fracture plugging measurement device, the crack simulated by this device has a relatively long depth or length, the crack can be separated after the test is completed, and the effect of the plugging material staying in different positions in the fracture can be observed Depth, analyze the different plugging effects and mechanisms of sealing, throat sealing, waist sealing and tail sealing

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