A method for determining the optimal dosage of fiber temporary plugging diversion fluid in tight reservoirs of oil and gas wells
A technology for tight reservoirs and oil and gas wells, which is used in earth-moving drilling, wellbore/well components, and production fluids.
Active Publication Date: 2021-05-18
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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[0004] The amount of fiber temporary plugging diversion fluid is the key to the design of temporary plugging diversion fracturing. At present, it mainly relies on field experience or simple calculation. There is no effective method to optimize the amount of fiber temporary plugging diversion fluid, which is difficult to meet the design of diversion fracturing in tight reservoirs. program needs
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Embodiment 1
[0045] As shown in the parameters in Table 1, the tangential stress distribution curve at the wellbore wall after drilling in Well A, the tangential stress distribution curve induced by the injected fluid at the wellbore wall, the tangential stress distribution curve induced by artificial fractures at the wellbore wall, and the superimposed wellbore The total tangential stress distribution curve at the wall, as shown in Figure 1 Figure 1(a) ~ Figure 1(d) As shown, it can be seen that after the initial fracturing, the tangential stress of the borehole wall is the smallest (196.8 MPa) at 90 degrees (perpendicular to the direction of the initial fracture), and the maximum (205.8 MPa) at 0 degree (parallel to the direction of the initial fracture). The difference between the two is 8MPa. Since the tensile strength of the rock in Well A is 4.2MPa, the fiber filter cake must generate a pressure difference of at least 12.2MPa to seal the initial pressure fractures and generate new div...
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A method for determining the optimal dosage of a temporary plugging diversion agent in tight reservoirs of oil and gas wells, comprising the steps of: (1) calculating the tangential stress on the well wall; (2) calculating the tangential stress induced by fluid injection at the well wall; 3) Calculate the stress induced by artificial fractures at the borehole wall; (4) Convert the stress in rectangular coordinates to the stress in polar coordinates to obtain the tangential stress induced by artificial fractures; (5) Convert the tangential stress field formula in the first three steps to Simultaneously, the tangential stress distribution around the wellbore wall after the first fracturing is obtained; (6) According to the rock elastic fracture criterion, the sum of the additional pressure drop value of the fiber filter cake plus the shear stress at the fracture in the first fracturing must be greater than the first The minimum value of the tangential stress of the wellbore wall after the secondary fracturing determines the optimal value of the additional pressure drop of the fiber filter cake; (7) calculates the corresponding optimal fiber filter cake length according to the Darcy formula; (8) calculates the fiber temporary plugging Optimal volume of steering fluid. It can effectively optimize the dosage of diverting agent for temporary plugging, and meet the needs of tight reservoir diversion fracturing design.
Description
technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and in particular relates to a method for determining the optimal dosage of fiber temporary plugging and diverting fluid in tight reservoirs of oil and gas wells. Background technique [0002] When the in-situ stress difference of the reservoir is large and the fracability is poor, it is difficult to form complex fractures in the hydraulic fracturing process, and forcing fractures to divert through temporary plugging is an important means to enhance the complexity of fracture network expansion. In the process of temporary plugging and diversion fracturing, the fiber temporary plugging diversion fluid is used to introduce artificial additional barriers to block previously formed fractures and high-permeability channels for controlled diversion fracturing, improving the scope and effect of stimulation. At present, it has been used in field applications such as carbona...
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IPC IPC(8): E21B49/00E21B43/26
CPCE21B43/26E21B49/00
Inventor 汪道兵周福建宇波侯艳红孙东亮刘雄飞韩东旭李敬法王鹏李秀辉谭艳新
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY