A Volume Fracturing Technology for Horizontal Wells in Tight Reservoirs
A volume fracturing and tight reservoir technology, which is applied in the direction of production fluid, wellbore/well components, earthwork drilling and production, etc. It can solve the problems that the overall permeability of the reservoir is not improved, it is difficult to achieve the expected effect, and the permeability of the reservoir is poor. , to achieve the effect of solving insufficient transformation, improving the success rate, and expanding the volume of transformation
Inactive Publication Date: 2016-02-17
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
At present, the fracturing stimulation of horizontal wells usually uses tools or techniques such as packers, bridge plugs, and hydraulic jets to realize multi-stage fracturing stimulation. Only one long fracture is opened in each stage of fracturing to expand the oil and gas drainage area of the horizontal well. Due to the failure to improve the overall permeability of the reservoir, the permeability of the reservoir perpendicular to the artificial fracture wall is very poor, and it is difficult to achieve the expected effect
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[0018] The technical solutions of the present invention are further described below with reference to the accompanying drawings and embodiments.
[0019] A volumetric fracturing technology for horizontal wells in tight reservoirs, mainly comprising the following steps:
[0020] 1) Collect data such as in-situ stress magnitude and direction, horizontal well orientation, length, reservoir Young's modulus, Poisson's ratio, and logging interpretation results, which are used as the basis for calculating complex fractures generated by volume fracturing of horizontal wells in tight reservoirs Induced stress basic parameters;
[0021] 2) According to the physical properties of the reservoir, compare the induced stress difference changes of three or more perforation clusters under different fracture initiation sequences in the same fracturing section, and select the maximum induced stress difference as the target to optimize the fracture initiation sequence of perforation clusters ; ...
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The invention relates to a tight reservoir horizontal well volume fracturing process. Data including in-situ stress magnitude and direction, horizontal well azimuth and length, reservoir Young moduli, a Poisson ratio, a well logging interpretation result and the like are collected and used as basic parameters for calculating induced stress needed for generation of complex cracks in tight reservoir horizontal well volume fracturing; according to reservoir physical characteristics, induced stress difference value variation conditions of three or more perforation clusters in the same fracturing segment according to different crack initiation sequences are contrasted, and preference is given to the perforation cluster crack initiation sequences with the maximal induced stress difference value as the target; preference is given to perforation cluster gaps so that the complex cracks can be formed through fracturing in the same fracturing segment of a horizontal well; in cooperation with perforation parameter optimization and with bottom hole pressure control as the target, the effect that the cracks of the perforation clusters at the two ends are initiated and extended for a certain distance through discharge capacity adjustment and then the discharge capacity is improved to utilize perforation friction for pressing open the cracks of the perforation clusters in the middle is achieved; then, prepad fluid and sand-carrying fluid containing a propping agent are poured into the cracks in sequence to realize transformation of the shape of the complex cracks of the fractured horizontal well.
Description
technical field [0001] The invention belongs to the technical field of oil and gas resources, and relates to a volumetric fracturing process for horizontal wells in tight reservoirs. Background technique [0002] As the contradiction between the supply and demand of oil and gas resources becomes more and more prominent, the development of oil and gas resources in tight reservoirs has attracted more and more attention. Due to the poor physical properties and complex pore structure of oil and gas resources in tight reservoirs, the ability of the matrix to supply liquid to the wellbore is extremely poor. In order to obtain economic development benefits, multiple fractures are formed by horizontal well staged fracturing to increase the oil drainage area of the oil and gas reservoir and change the oil and gas capacity. The seepage method is the key technology to realize the efficient development of this kind of reservoir. At present, the fracturing stimulation of horizontal we...
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IPC IPC(8): E21B43/26
Inventor 曾凡辉郭建春
Owner SOUTHWEST PETROLEUM UNIV