Numerical calculation method of effective action distance of acid fracturing in deep limestone reservoirs
An effective, numerical calculation technology, applied in calculation, earthwork drilling, data processing application, etc., can solve problems such as the influence of acid fracturing effect that is rarely considered comprehensively
Active Publication Date: 2020-10-09
SOUTHWEST PETROLEUM UNIV +1
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[0004] At present, the commonly used method for calculating the effective action distance of acid liquid mainly focuses on the calculation of the limit concentration of residual acid (Li Jianhui, Mu Lijun, Zhao Zhenfeng, et al. A method for evaluating the effective action distance of acid liquid based on the limit of residual acid, CN105044288A[P].2015 ), seldom comprehensively consider the influence of the temperature change of the acid fluid during the fracturing process on the effect of acid fracturing
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[0136] The present invention will be further described below in conjunction with the accompanying drawings and application examples, for the purpose of schematically illustrating and explaining the present invention, and not limiting the scope of the present invention. details as follows:
[0137] 1. Based on the basic parameters of acid fracturing design in well X of an exploratory well in the target work area (Table 1), a physical model of wellbore temperature field in well X was established and meshed (see figure 1 ), use the wellbore temperature field model established in step (1) to calculate the dynamic bottomhole temperature during the well construction process, and obtain the bottomhole temperature at the end of the construction. Compared with the measured bottom hole temperature curve, it can be proved that the model is reliable (see figure 2 ).
[0138] Table 1. Some basic parameters of acid fracturing design in Well X
[0139]
[0140] 2. Taking the bottomhol...
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The invention discloses a numerical calculation method of the acid fracturing acid liquid effective action distance of a deep layer limestone reservoir. The method comprises the following steps of (1)calculating the well bottom temperature when the construction is completed; (2) calculating the length of cracks when the construction is completed; dividing lattice units in the crack length direction; and calculating the average crack width of each unit to obtain the acid liquid flow rate of each unit; (3) using the well bottom temperature as the initial conditions to calculate the acid liquidtemperature and acid liquid concentration of each unit without considering the acid rock reaction heat; (4) calculating the acid rock molar reaction heat of each unit; and (5) calculating the acid liquid temperature and acid liquid concentration of each unit considering the acid rock reaction heat; building an acid liquid concentration distribution curve; defining the 10 percent of the acid liquidinitial injection concentration as the residue acid limit concentration; and using the crack length corresponding to the residue acid limit concentration as the acid liquid effective action distance.The method has the advantages that the heat effect received by the acid liquid in the acid fracturing process is considered; the calculation accuracy of the acid liquid effective action distance is improved; and the guiding significance is realized on the acid fracturing design of the deep layer limestone reservoir.
Description
technical field [0001] The invention relates to the field of petroleum engineering, in particular to a numerical calculation method for the effective action distance of acid liquid in the acid fracturing process of deep limestone reservoirs. The numerical calculation method is used to calculate the effective action distance of acid liquid under high temperature conditions, to improve the accuracy of acid fracturing design of deep limestone reservoirs, and to realize high-efficiency acid fracturing stimulation of deep limestone reservoirs. Background technique [0002] The Permian deep carbonate reservoirs in western Sichuan show good exploration potential and have become one of the most realistic replacement strata in the Sichuan Basin at this stage. The reservoirs are mainly limestone and dolomite, and are characterized by deep burial (>5000m) and high temperature (>145°C). It is difficult to naturally obtain industrial oil and gas flow in the development of this are...
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IPC IPC(8): E21B43/22E21B47/06E21B47/07G06Q50/02
CPCE21B43/16E21B47/06E21B47/07G06Q50/02
Inventor 郭建春刘壮苟波黄平辉赵俊生伍林张项飞
Owner SOUTHWEST PETROLEUM UNIV