A method for delaying the volume decline of effective fracture stimulation in deep shale gas
A technology for transforming volume and shale gas, which is applied in the direction of exploitation fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of rapid production decline, no economic value of exploitation, and limited transformation volume, so as to slow down diversion Decrease in capacity, increase the volume of reservoir stimulation, and reduce the effect of construction pressure
Active Publication Date: 2021-02-26
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0004] (2) The "effective" stimulation volume of fractures is limited: due to the increase of burial depth and various uncertainties, it is difficult to completely match the proppant particle size, sand-liquid ratio and sand addition amount with the multi-scale fractures created by fractures
Pressed primipara 9.5x10 4 m 3 / d, but the output declines fast, and the output is only 1.5x10 after 3 months 4 m 3 / d, obviously has no economic mining value
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Embodiment
[0052] Well Dingye X has an oblique depth of 5322.00m, a vertical depth of 4095.46m, and a horizontal section length of 1234m. The well targets sub-layers ① to ⑤ in the high-quality shale gas section of the Wufeng Formation-Longmaxi Formation. It is a typical deep shale gas formation. In the shale gas reservoir, the porosity of organic-rich mud shale in the pilot hole of this well is between 2.07% and 5.59%, with an average of 3.06%; the permeability is 0.04 to 6.04md, with an average of 0.34md. The effective porosity of high-quality shale intervals is between 3.00% and 5.59%, with an average of 3.93%; the permeability is 0.056 to 6.04md, with an average of 0.75md.
[0053] The well is constructed using the method described in the present invention, and is divided into 17 sections for fracturing reconstruction. The specific implementation steps are as follows:
[0054] (1) Evaluation of reservoir characteristic parameters before fracturing. This well interprets 5.00m / 1 layer...
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The invention discloses a method for delaying progressive decrease of the effective crack transformation volume by deep shale gas. The method comprises the following steps: (1) pre-pressing reservoircharacteristic parameter evaluation; (2) acid pretreatment, wherein the usage amount of an acid solution is 5.0-10.0 m<3>, the discharge capacity of the acid solution is designed to be 0.5 m<3> / min-1.0m <3> / min; (3) prepad acid fracturing, wherein an acid liquor system adopted has a viscosity ranging from 30 mPa.s to 40 mPa.s and a construction displacement at 5 m<3> / min-8 m<3> / min; (4), multi-stage variable-parameter alternate injection mode sand-adding fracturing; (5) crack supporting profile optimization and control; (6) on the basis of the step (5), closing of all cracks after flowback iscarried out for 30 min-60 min, and then closed acidification treatment after closing of all cracks; and (7) displacement operation. While the effective crack transformation volume of deep shale gas fracturing is increased, the decline rate of the crack flow conductivity is effectively reduced, and the fracturing production effect is improved.
Description
technical field [0001] The invention relates to the technical field of deep shale gas fracturing, and furthermore, relates to a method suitable for delaying the volume decline of effective fracture fracturing in the fracturing process of deep shale gas wells. Background technique [0002] Great progress has been made in shale gas fracturing at home and abroad. However, due to the deep burial, high temperature and high pressure of deep shale gas, the pressure during fracturing construction is high, the fluctuation is large, and it is difficult to add sand. Low-level problems, even if the fracturing operation is successful, but due to the narrow fracture width, low conductivity and rapid decline formed under high closure pressure conditions, the production after fracturing is low and the decline is fast, making effective development difficult. Specifically in the following points: [0003] (1) The volume of fracture stimulation is limited: with the increase of depth, the widt...
Claims
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IPC IPC(8): E21B43/267E21B43/27
Inventor 蒋廷学吴春方刘建坤李双明吴峙颖周林波刘世华
Owner CHINA PETROLEUM & CHEM CORP