Method for preparing rock core for shale experiments
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A core and shale technology, applied in the preparation of test samples, etc., can solve the problems of error in experimental results, inability to simulate the characteristics of shale pore roar, etc., and achieve the effect of accurate experimental results.
Inactive Publication Date: 2017-07-07
CHINA PETROLEUM & CHEM CORP +1
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[0007] The above-mentioned core preparation methods have realized the simulation of shale and its fracture system to a certain extent, but the above-mentioned casting molding method, tempered glass method and steel block simulation m
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[0041] first embodiment
[0042] It should be noted that the test core prepared in the first embodiment of the present invention can be used in a shale micro-fracture plugging experiment, and this experiment can truly evaluate the plugging effect of the plugging agent on shale micro-fractures. The concrete steps of rock core preparation method of the present invention are as follows:
[0043] (1) if figure 1 As shown, the core used in the present invention is real formation shale or outcrop rock. Adopt dry method or liquid nitrogen cooling method to drill rock core column 1, the diameter of rock core column 1 is preferably 20~30mm (particularly
[0044] 25 mm), the ratio of the length to the diameter of the core column 1 is preferably 0.2-2.
[0045] (2) if figure 2 As shown, a fracture maker is used to create fractures in the core column 1. Preferably, the fractures are located in the middle of the cross section of the core column 1.
[0046] (3) if image 3 As shown, ...
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[0053] second embodiment
[0054] It should be noted that the rock core prepared in the second embodiment of the present invention can be used in the shale pressure penetration experiment, which can truly reflect the process of pressure transmission in the shale. The concrete steps of rock core preparation method of the present invention are as follows:
[0055] (1) The rock core used in the present invention is real formation shale or outcrop rock. The shape is not required, but the rock surface must be clean.
[0056] (2) Spray a layer of release agent evenly on the inner wall of the mold to facilitate demoulding. Wherein, the diameter of the mold is preferably 35-40 mm, especially 38 mm, but not limited thereto.
[0057] (3) if Figure 7 As shown, a material is injected into the mold to form a wrapping layer 3 for wrapping the core 1'.
[0058] Wherein, the wrapping layer 3 may use epoxy resin and curing agent mixed uniformly in a certain proportion, preferably the epo...
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Abstract
The invention provides a method for preparing a rock core for shale experiments. The method includes the following steps that 1, drilling is conducted on actual stratum shale or outcrop rock to obtain a rock core column;2, crack making is conducted on the rock core column; 3, according to the thickness of a crack which needs to be simulated, a plurality of sheet-shaped objects with the same thickness are made, and the sheet-shaped objects are uniformly arranged on the surface of the crack; 4, the rock core column is folded and sealed by gel; 5, a wrapping layer capable of completely sealing the rock core column is wrapped outside the rock core column, and a rock core to be tested is prepared; 6, holedrilling is conducted on the upper and lower ends, in the extension direction of the crack, of the rock core to be tested till the end faces of the rock core column are exposed. By the adoption of the method, intrinsic structural features of the shale and wall-surface features of the crack under actual stratum conditions can be actually reproduced, so that results of crack plugging experiments are more accurate; the solidified wrapping layer and the rock core (column) are tightly wrapped, and when the experiments are conducted, results cannot be influenced by the generation of pressure penetration.
Description
technical field [0001] The invention relates to the field of petroleum engineering, in particular to a core preparation method in the study of shale fracture leakage and well wall instability. Background technique [0002] Different from the wellbore instability caused by conventional expansive shale with strong water sensitivity, shale reservoirs usually have low content of water-sensitive clay minerals and well-developed micro-fractures and beddings. During the drilling process of shale reservoirs, the drilling fluid filtrate is easy to invade along the micro-fractures and weak bedding planes, resulting in the continuous expansion and connection of fractures, resulting in the instability of the entire wellbore, resulting in accidents such as pipe sticking and backfill sidetracking. occur. In order to solve the problem of wellbore instability in shale reservoirs, it is necessary to strengthen the plugging performance of micro-fractures, effectively reducing or even prevent...
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