A method for optimizing the number of stratified fracturing stages in low-permeability tight reservoirs
A technology for layered fracturing and tight reservoirs, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., and can solve problems such as high cost of stimulation and reconstruction, difficult to ensure hydraulic fractures, and difficult layered fracturing
Active Publication Date: 2017-12-05
SOUTHWEST PETROLEUM UNIV +1
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Problems solved by technology
It is difficult to perform layered fracturing from the perspective of fracturing tools, and it is difficult to ensure that hydraulic fractures only extend in the production layer and do not extend into the interlayer from the perspective of fracturing technology
At the same time, the more stages of fracturing, the higher the cost of stimulation and transformation
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[0043] The present invention will be further described below in conjunction with accompanying drawings and field application examples.
[0044]Well ZX32 located in Shengli Oilfield is a low-permeability tight sandstone oil well with a drilling depth of 3919m. According to the requirements of well logging interpretation and stimulation stimulation, it is necessary to carry out hydraulic fracturing stimulation for the interval 3823.5m-3852.8m. Apply the method provided by the invention to optimize the number of stratified fracturing stages.
[0045] (1) Through the logging curve ( figure 1 ) and corresponding logging interpretation (Table 1) to obtain the corresponding physical parameters of Z32 fracturing layer and interlayer, and obtain the stress profile of fracturing layer production and interlayer according to the three-dimensional stress distribution ( figure 2 ), to obtain the stress difference of interlayer.
[0046] Table 1 Log interpretation data table of the fract...
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The invention discloses a separate-layer fracturing stage number optimization method for a low-permeability compact reservoir. The separate-layer fracturing stage number optimization method comprises the steps that 1, a single well X fracturing position is divided into N transformation small layers; 2, assuming that the hydraulic fracture morphology is double-wing symmetrical cuboids, the corresponding hydraulic fracture transformation volume V is obtained under the certain fracturing liquid amount V<L> and the discharge amount Q<L>; 3, the N transformation small layers are divided into M fracturing sections from the point of fracture extension; 4, the fracturing liquid amounts V<L>, the discharge amounts Q<L> and the transformation volumes V corresponding to the fracturing liquid amounts V<L> and the discharge amounts Q<L> are obtained under different fracturing stage numbers; 5, the production income present value R of a single well X for three years is calculated under the different fracturing stage numbers and transformation volumes; 6, the hydraulic fracture transformation cost C is calculated under the different fracturing stage numbers; and 7, after fracturing is conducted, the production net present value (NPV) for three years is calculated, the relation curve of the different fracturing stage numbers and the NPVs is drawn, and the optimum fracturing stage number of the single well X is determined on the basis of the maximum NPV. The separate-layer fracturing stage number optimization method for the low-permeability compact reservoir is reliable in principle, convenient to operate and capable of providing a feasible method for production increase and transformation of oil and gas pools.
Description
technical field [0001] The invention relates to a method for optimizing the number of stratified fracturing stages used in low-permeability tight reservoirs during oil and gas exploration and development. Background technique [0002] With the deepening of oil and gas exploration work, it is found that most oil and gas reservoirs are characterized by low porosity, low saturation, and low permeability, making it difficult to exploit. In order to achieve commercial development value, hydraulic fracturing has become an essential production stimulation measure. There are generally multiple production layers in the vertical direction of oil and gas reservoirs, and each production layer has certain heterogeneity. However, oil fields usually adopt general fracturing (first-stage fracturing), and generally only one production layer can be exploited. Therefore, the fracturing of production layers is not highly targeted, and the production capacity of each production layer cannot be...
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IPC IPC(8): E21B43/267E21B49/00
CPCE21B43/267E21B49/00
Inventor 郭建春罗波卢聪段伟刚陈莉蒋宝云周玉龙许鑫肖森文张明明陈步高
Owner SOUTHWEST PETROLEUM UNIV