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Evaluation method for fracture conductivity of shale gas combined with sand and fracturing

A technology of sand fracturing and diversion capacity, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., to achieve accurate quantitative evaluation and test methods are practical and feasible

Active Publication Date: 2017-05-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But at present, there is no method for indoor quantitative evaluation of the proppant conductivity of shale reservoir slick water combination plus sand fracturing fracture proppant at home and abroad, so the present invention has certain innovation and forward-looking

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  • Evaluation method for fracture conductivity of shale gas combined with sand and fracturing
  • Evaluation method for fracture conductivity of shale gas combined with sand and fracturing
  • Evaluation method for fracture conductivity of shale gas combined with sand and fracturing

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Embodiment 1

[0069] As a preferred embodiment of the present invention, see figure 1 , figure 2 , image 3 .

[0070] Test required proppant quality:

[0071] in ：W p1 --- 40 / 70 mesh ceramsite quality;

[0072] W p2 --- 100 mesh quartz sand quality;

[0073] W p3 --- 20 / 40 mesh ceramsite quality;

[0074] A method for evaluating the conductivity of shale gas combined sand fracturing fractures, comprising the following steps in sequence:

[0075] (1) According to the obtained distribution shape function F of proppant with different particle sizes in the API diversion chamber 1 (x, t), F 2 (x, t), draw the boundary line of different proppants on a metal plate 5;

[0076] (2) The paving area A of different proppants (100 mesh quartz sand, 40 / 70 mesh ceramsite and 20 / 40 mesh ceramsite) was obtained by geometric integral 1 , A 2 , A 3 , and then get the mass W of the corresponding proppant according to the laying thickness H and proppant density p1 , W p2 , W p3 ;

[00...

Embodiment 2

[0090] As the best implementation mode of the present invention, the present invention mainly includes: description and recording of the distribution shape of sand banks in visual fractures in combined sand fracturing, establishment of distribution shape functions of different proppant sand banks, and experimental measurement and evaluation of conductivity in fractures Wait for three parts. The specific steps are:

[0091] a. With the help of the simulation experiment device for proppant flow in the visualized fracture network, simulate the migration process of the sand embankment in the shale gas slick water combined sand fracturing fracture, and obtain the sand embankment migration video of the combined sand fracturing under different experimental conditions;

[0092] b. Using the grayscale processing method and the point-by-point scanning method to obtain the distribution curves of proppant sand banks with different particle sizes, and use the linear regression method to ob...

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Abstract

The invention discloses a method applied to evaluation of flow conductivity of shale-gas-combined sand fracturing fracture. The method comprises the following steps: a, simulating a sand bar transporting process in shale-gas-slickwater-combined sand fracturing fracture by means of an experiment device for simulating flowing of proppants in a visual fracture net to obtain sand bar transporting video of the combined sand fracturing fracture under different experiment conditions; b, obtaining a distribution curve of the proppants with different particle diameters by virtue of a gray processing method and a point-by-point scanning method and obtaining distribution shape function of the proppants with different particle diameters by virtue of a linear regression method; c, building the sand bar distribution shape function of an API flow guide chamber by utilizing geometric similarity principle according to the size of the API flow guide chamber, paving shapes of the corresponding proppants and implementing evaluation of flow conductivity of shale-gas-combined sand fracturing fracture. The method is capable of simply and accurately implementing quantitative evaluation of the flow conductivity of shale-gas-combined sand fracturing fracture; experiment support is provided for optimizing the combined sand fracturing design and improving the flow conductivity of the shale fracturing fracture.

Description

technical field [0001] The invention relates to the technical field of shale gas combined sand fracturing fracture capability evaluation. Background technique [0002] Shale reservoirs are characterized by low porosity, low permeability and developed natural fractures. At present, the large-scale and large-displacement horizontal well multi-stage fracturing technology is widely used in shale reservoirs. By forming an effective complex fracture network, the volume of reservoir stimulation can be increased, and the production of gas wells can be greatly increased. However, the uncertainty of proppant migration and fracture conductivity in the complex fracture network has a huge impact on shale reservoir stimulation, seriously affecting the effective stimulation of the reservoir. Therefore, by observing the migration law of proppant through the indoor visualized proppant flow simulation experiment device in the fracture network, and quantitatively evaluating the proppant condu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 尹丛彬李彦超王丹王素兵朱炬辉李莹熊雨然段明锋刘静
Owner BC P INC CHINA NAT PETROLEUM CORP
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