Experimental device and method for simulating extension influence of hydraulic fracturing cracks and natural cracks
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A technology of hydraulic fracturing and natural fractures, applied in the direction of earthwork drilling, mining fluid, measurement, etc., to achieve the effect of low economic cost and simple structure
Active Publication Date: 2018-02-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0005] In view of the shortcomings of traditional experimental methods in real-time and direct observation and analysis of the expansion of hydraulic fractures,
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Embodiment 1
[0026] Embodiment 1, with reference to attached figure 1 and 2, the present invention mentions an experimental device for simulating the influence of hydraulic fracturing fractures and natural fracture propagation, and its technical scheme is: comprising a data processing computer terminal (1), an image monitoring module (2), a data acquisition module (3), High-definition high-speed camera (4), white light source (5), hydraulic fracturing physical simulation experiment chamber (6), servo control injection pump (8), analog-to-digital conversion module (9), simulated fracturing wellbore (11), confining pressure The pump (15), the high-definition high-speed camera (4) is installed above the hydraulic fracturing physical simulation experiment chamber (6), and is connected to the data processing computer terminal ( 1); the two sides of the hydraulic fracturing physical simulation experiment chamber (6) are respectively connected to the confining pressure pump (15), and the confini...
Embodiment 2
[0039] Embodiment 2, a more specific method of use in the present invention, comprises the following steps:
[0040] (1) According to the requirements of the experiment, select cement, quartz sand, clay, water and other materials of different components, add shredded A4 printing paper, oatmeal, or shredded kraft paper, mix them into the mold, and place the specimen in the mold for 72 hours Finally, remove the mold, and then put it into a constant temperature and humidity box for 14 days of maintenance;
[0041] (2) After the fracturing sample reaches the predetermined strength, use a drilling machine to drill in, insert a high-pressure resistant metal pipe to simulate the fracturing wellbore, and use a sealing ring and sealant to seal it. At the same time, one end is closed and the other end is open. To connect the hydraulic fracturing fluid injection manifold, the side is simulated perforation;
[0042] (3) First, use white self-spray paint to spray the surface of the cut fr...
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Abstract
The invention relates to an experimental device and method for simulating the extension influence of hydraulic fracturing cracks and natural cracks. Fracturing pipe columns are simulated through steelpipes, planar rock samples are formed through pouring and cured, and then rock samples with random spots are prepared; then the samples are placed into adjustable hydraulic fracturing cavities, unequal ground stress is applied to the two sides of the samples, and then fracturing liquid is injected through the fracturing pipe columns; and meanwhile a high-speed camera is utilized to shoot the crack extension condition in the hydraulic fracturing process, the rock body deformation condition in the hydraulic fracturing process is collected through a deformeter, and the pumping-in pressure and strain change are detected. According to the experimental device and method for simulating the extension influence of the hydraulic fracturing cracks and the natural cracks, the interplaying mechanicalrelation between the hydraulic fracturing cracks and the natural cracks can be intuitively analyzed, the distribution problem after a flow makes contact with the natural cracks can be accurately researched, and meanwhile the complex mechanical behavior such as cracking rules of hydraulic fracturing, rock body deformation caused by hydraulic crack extension and opening, re-starting or dislocation of the natural cracks at different strength is intuitively observed.
Description
technical field [0001] The invention relates to the field of hydraulic fracturing stimulation development, in particular to an experimental device and method for simulating the influence of hydraulic fracturing cracks and natural crack expansion. Background technique [0002] Hydraulic fracturing is to use high-pressure pumps on the ground to pump fracturing fluid with a certain viscosity into the wellbore with a large displacement. When the fluid pressure exceeds the tensile strength of the rock itself, a fracturing fluid with a certain conductivity can be formed in the reservoir. Hydraulic fractures, the formation of hydraulic fractures will greatly improve oil and gas seepage capacity and increase oil and gas production. At present, hydraulic fracturing technology has become the core technology for the development of low-permeability and unconventional oil and gas fields, especially in the commercial development of shale gas, tight oil and gas reservoirs and other reservo...
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