A method for predicting forced self-absorption in shale reservoirs
A technology of shale reservoir and prediction method, which is applied to measurement devices, soil material testing, instruments, etc., can solve the problems of forced external force and calculation result error without considering the sliding effect of fracturing fluid in capillary shape.
Active Publication Date: 2020-04-24
SOUTHWEST PETROLEUM UNIV
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However, in their calculation model, it is assumed that the capillary is a circular feature, and the actual shape of the capillary, the slip effect of the fracturing fluid and the forced external force are not considered, resulting in large errors in the calculation results
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[0342] The experimental rock samples and fluid basic parameters used for self-priming calculation are shown in Table 1:
[0343] Table 1 Basic parameters of rock samples and test fluids
[0344]
[0345] (1) Comparison of self-priming length
[0346] Such as figure 1As shown, among the two types of pores, organic pores and inorganic (clay) mineral pores, the self-absorption length of clay pores is the largest. That is, at the same time, the water self-imbibition invades the deepest clay pores; judging from different self-imbibition depths, the self-imbibition process of shale rocks is not piston displacement, but non-uniform advancement. This is mainly due to the fact that the self-priming force of clay pores is not only affected by forced self-priming force and capillary force, but also by osmotic pressure; at the same time, the wettability of organic pores is poor, and capillary force is small; The difference in pore morphology is also part of the reason.
[0347] Suc...
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The invention discloses a prediction method for the forced self-absorption quantity of a shale reservoir stratum. Shale is divided into organic matters and inorganic matters (clay minerals) by analyzing shale minerals. A self-absorption prediction method for the organic matters of the shale is established by considering influence of capillary force and forced self-absorption force on the organic matters in the fracturing process, noncircularity characteristics of capillary tubes of the organic matters and a boundary slip effect together with a fractal theory. A self-absorption quantity prediction method for the shale clay minerals is established by considering influence of capillary force, clay aperture osmotic pressure and forced self-absorption applied force on the clay minerals in the fracturing process, as well as influence of capillary-tube noncircularity characteristic, boundary slip effect, clay aperture osmotic pressure and forced outside force of practical organic matters, andcombining the fractal theory. A shale multi-aperture division model is combined with the self-absorption results of the organic matters and clay minerals of the shale to establish the prediction method for the forced self-absorption quantity of the shale reservoir stratum.
Description
technical field [0001] The invention belongs to the technical field of unconventional oil and gas development, and in particular relates to a method for predicting the forced self-absorption of shale reservoirs. Background technique [0002] Shale reservoirs are characterized by low porosity, low permeability, and difficult production. Large-scale volume fracturing is a key technology for developing shale gas. Gas-rich shale reservoirs generally contain a large amount of organic matter and clay minerals. The tiny capillaries of organic matter and clay minerals in shale minerals will enter the capillaries under the action of capillary force. Due to the different characteristics of shale organic matter and clay minerals, different types of minerals have different forced self-imbibition mechanisms during the self-imbibition process of fracturing fluid. In the forced self-priming process of shale organic matter and clay minerals, in addition to being affected by the capillary d...
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IPC IPC(8): G01N13/02G01N13/04G01N15/08G01N33/24
CPCG01N13/02G01N13/04G01N15/0826G01N15/088G01N33/24G01N2013/0208
Inventor 曾凡辉郭建春文超王磊王庆蓉段蕴琦
Owner SOUTHWEST PETROLEUM UNIV