A diagnostic method for staged fracturing operation conditions of horizontal wells
A staged fracturing and diagnostic method technology, applied in the field of hydraulic fracturing, can solve the problems of staged fracturing failure and large diagnostic errors in horizontal wells
Inactive Publication Date: 2018-01-12
SOUTHWEST PETROLEUM UNIV
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[0003] However, at present, the diagnosis method of horizontal well staged fracturing operation in my country's oilfields still adopts the Nolte-Smith diagnosis method of conventional single fracture fracturing construction, which not only makes the diagnosis error large, but also leads to the occurrence of horizontal well staged fracturing operations. failure, so we urgently need to develop a diagnostic method suitable for staged fracturing in horizontal wells
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[0067] A horizontal well in the Sichuan Basin completed with a vertical depth of 4276m, a horizontal section length of 800m, an effective thickness of 32m, and a formation fluid pressure of 42MPa. According to the core experiment analysis, it is determined that the in-situ stress field is vertical principal stress 145MPa, horizontal maximum and minimum principal stress are 121.6MPa and 109.0MPa respectively; rock cohesion is 17.5MPa, internal friction angle is 25°; average elastic modulus is 32.32GPa, average Poisson The ratio is 0.2, and the average tensile strength is 9.59MPa. Now, slick water fracturing fluid (approximately Newtonian fluid, flow pattern index 1.0) is used for fracturing in 15 stages, with an average interval of 50m. The designed spacing of fracturing fractures is 50m, and the measured net construction pressure of the fracturing section without interference from fracturing fractures before construction is 8MPa. Then, the specific steps of the diagnostic met...
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The invention belongs to the technical field of hydraulic fracturing in exploration and development of oil and gas fields, particularly relates to a working condition diagnosis method for staged fracturing construction of horizontal wells. The working condition diagnosis method for the staged fracturing construction of the horizontal wells includes the following steps of A judging the extension mode of a fracture in a fractured section; B calculating interference stress of a fracture in a fractured section on a fracture in the section under fracturing currently in the process of the staged fracturing construction of the horizontal wells; C calculating the minimum principal stress of the stratum practical level of the fracture of the fractured section on the fracture in the section under fracturing currently under the action of interference stress; D calculating the practical net pressure of the fracture of the section under fracturing currently; E calculating the practical net pressure of the fracture in the construction process and double-log slope of the construction time; F calculating upper and lower limits of the extension index of the current fracture under different extension modes so as to determine the variation range of the extension index; and G judging the relation between the double-log slope and the upper and lower limits of the extension index. By considering the stress inference of various fractures in the staged fracturing construction of the horizontal wells and the fracture crossing / slipping criterion, the working condition during staged fracturing construction of the horizontal wells can be effectively diagnosed.
Description
technical field [0001] The invention relates to a method for diagnosing working conditions of staged fracturing in horizontal wells, and belongs to the technical field of hydraulic fracturing in the exploration and development of oil and gas fields. Background technique [0002] Staged fracturing of horizontal wells is the core technology for fracturing of low-permeability, ultra-low-permeability and even unconventional reservoirs. Generally, horizontal wells are drilled in the target layer, and then staged fracturing is carried out in the horizontal wells to form multiple fractures. Since the fractures formed in the previous fracturing will cause stress interference to the current fracturing fractures, the current fracturing fractures will be changed. Due to the in-situ stress distribution of the horizontal well staged fracturing section, the change law of the net pressure of fracture extension in the current construction section of the horizontal well staged fracturing is ...
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IPC IPC(8): E21B43/26G06F17/50
CPCE21B43/26G06F30/20
Inventor 胡永全赵金洲刘通义傅成浩任岚刘映玥
Owner SOUTHWEST PETROLEUM UNIV