A method for determining the plugging strength required for temporary plugging in fractures
A strong, natural fracture technology, applied in the direction of earthwork drilling, sealing/isolation, borehole/well components, etc., can solve the problems of lack of effective guidance
Active Publication Date: 2020-09-22
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology
At the same time, there is a lack of effective guidance on optimizing the formula and dosage of temporary plugging agents to achieve the target plugging strength
Method used
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[0011] In order to better understand the purpose, structure and function of the present invention, a method for determining the plugging strength required for temporary plugging in the fracture will be described in further detail below in conjunction with the accompanying drawings.
[0012] The plugging strength required for temporary plugging in fractures refers to adding temporary plugging materials to the ends of fractures or in fractures during construction to increase the net pressure until a large number of natural fractures are opened. Net pressure value p 1 (the net pressure after adding temporary plugging materials to open a large number of natural fractures) and the net pressure value p that can be achieved in fractures without adding temporary plugging materials 2 The difference is the plugging strength (p 1 -p 2 ),
[0013] Such as figure 1 As shown, the present invention provides a method for determining the required plugging strength for temporary plugging in...
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The invention provides a method for determining the plugging strength for in-fracture temporary plugging and deflection. The method comprises the steps of collecting data of a target reservoir, which are relevant with different opening mode calculating models of natural fractures; based on different opening mode calculating models of interaction of natural fractures and hydraulic fractures, acquiring multiple kinds of static pressure p1 required for opening each natural fracture in the target reservoir in different modes; optimizing the acquired multiple kinds of static pressure p1 to obtain the optimum static pressure p1'; calculating the static pressure p2 which can be achieved in manual fractures when in-fracture temporary plugging is not performed; determining that the plugging strength for in-fracture temporary plugging and deflection is the difference between p1' and p2. The method can guide field staff to determine the plugging strength required for in-fracture temporary plugging and deflection rapidly and conveniently, so that wells can be selected more reliably and the formulas and consumption quantities of temporary plugging agents can be selected optimally.
Description
technical field [0001] The invention relates to the field of petroleum engineering, in particular to a method for determining the required plugging strength for temporary plugging in a fracture. Background technique [0002] In the stimulation of unconventional reservoirs in the petroleum field, the intra-fracture temporary plugging and diversion to fracturing technology provides new vitality, reduces the stimulation cost, and improves the stimulation efficiency. The intra-fracture temporary plugging diversion fracturing process specifically refers to the addition of degradable plugging materials (composite fibers and particles) during the fracturing process to plug the ends or inside of artificial fractures, and the injection of subsequent fracturing fluids will significantly increase. The net pressure in the fracture, when the net pressure in the fracture reaches the opening pressure of natural fractures, a large number of natural fractures will be opened to generate branc...
Claims
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IPC IPC(8): E21B49/00E21B43/26E21B33/13
CPCE21B33/13E21B43/26E21B49/00
Inventor 赵兵李楠杨玉琴周福健王博袁立山耿宇迪张雄陈定斌何晓波胡文庭罗攀登方裕燕
Owner CHINA PETROLEUM & CHEM CORP