Critical sand plug fracturing method for improving crack complexity

A complex and sand-plugging technology, applied in the field of critical sand-plugging fracturing, can solve problems such as low complexity of fractures, unreasonable design of construction parameters, and unsatisfactory fracturing effects

Active Publication Date: 2019-10-18
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0012] In order to solve the unreasonable selection of liquid viscosity and proppant particle size as well as the unreasonable design of construction parameters such as construction displacement and sand-liquid ratio in the prior art, the complexity of the fractures caused is not high, the volume of reservoir stimulation is limited, and the fracturing Unsatisfactory effects, etc., the present invention provides a critical sand plugging fracturing method that increases the complexity of fractures

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  • Critical sand plug fracturing method for improving crack complexity

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Embodiment

[0070] Well Z is a marine shale gas horizontal well. The target layer of this well is the Lower Silurian Longmaxi Formation-Upper Ordovician Wufeng Formation, with a vertical depth of 2626.80-2707m. The average brittle mineral content of the well target layer is 69.2%, Young's modulus is 19.1-24.5GPa, Poisson's ratio is 0.25-0.27, the maximum horizontal principal stress is 62MPa, the minimum horizontal principal stress is 52MPa, the vertical stress is 67MPa, and the absolute value difference of horizontal stress is 10MPa , The horizontal stress difference coefficient is 19%. The imaging logging shows that the horizontal bedding of the target layer is developed, and there are high conductivity fractures and high resistivity fractures in some intervals. Overall, this well is conducive to volume stimulation. Utilize the method provided by this patent to carry out critical sand plugging fracturing construction in one section of the well, and the specific implementation steps are a...

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Abstract

The invention discloses a critical sand plug fracturing method for improving crack complexity. The method includes the following steps: (1) formation evaluation before fracturing; (2) preferable selection of viscosity of pre-crack generation fracturing fluid; (3) application of different viscosity fracturing fluid to generate cracks of different sizes at different stages; (4) preferable selectionof dosage proportion and particle size of a proppant matching the different crack sizes; (5) design of a bench type slug sanding mode; (6) implementation of a critical sand plug fracturing process; and (7) other construction steps and a flowback and production process. The method realizes the effective promotion of net pressure and an induced stress field in the whole process of one-time sand fracturing, thereby reducing a horizontal stress difference of two directions of a formation at different positions of a main crack to make the opening of natural cracks or micro cracks filled with calcium easier. The main crack turns and then communicates and intersects with the natural cracks or the micro cracks, thereby maximizing the complexity of the whole crack system and further improving the crack reconstruction volume and single well production.

Description

technical field [0001] The invention relates to the technical field of shale gas development, in particular to a critical sand plugging fracturing method for increasing the complexity of fractures. Background technique [0002] At present, horizontal well volume fracturing technology has been widely applied in shale gas exploration and development, and has successfully achieved commercial breakthroughs in Sinopec's Jiaoshiba area and PetroChina's Changning-Weiyuan area. The main technological measures adopted are high displacement, large liquid volume, low viscosity and low sand-to-liquid ratio, and supporting the use of fracturing fluid with two viscosities of slick water and glue, and 70-140 mesh, 40-70 mesh and 30 mesh -50 mesh proppant, and multi-stage proppant slug technology, etc., to achieve the purpose of volume fracturing reconstruction. [0003] The document "Research and Test on New Technology of Multi-fracture Fracturing" ("Petroleum Drilling and Production Tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/26E21B43/267
Inventor 蒋廷学王海涛卞晓冰李双明李奎为苏媛肖博周林波
Owner CHINA PETROLEUM & CHEM CORP
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