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An optimization method for staged fracturing of horizontal wells in tight reservoirs with strong heterogeneity

A technology for heterogeneous and tight reservoirs, applied in the field of hydraulic fracturing, can solve problems such as the difficulty of effectively arranging hydraulic fractures, and achieve the effect of improving production degree and economy, and reducing fracturing stimulation.

Active Publication Date: 2022-03-01
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] The purpose of the present invention is to solve the current problem of difficulty in effectively arranging hydraulic fractures for staged fracturing of horizontal wells in tight reservoirs with strong heterogeneity, and to provide an optimization of fracture layout for staged fracturing of horizontal wells in tight reservoirs with strong heterogeneity method

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  • An optimization method for staged fracturing of horizontal wells in tight reservoirs with strong heterogeneity
  • An optimization method for staged fracturing of horizontal wells in tight reservoirs with strong heterogeneity
  • An optimization method for staged fracturing of horizontal wells in tight reservoirs with strong heterogeneity

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Embodiment Construction

[0025] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] see Figure 1-Figure 2 , an embodiment of an optimization method for staged fracturing of horizontal wells in tight reservoirs with strong heterogeneity, comprising the following steps:

[0027] Step 1: According to the physical parameters of the target reservoir, classify the target reservoir into 4 grades from good to poor: I, II, III, and IV. Among them, Type I, II, and III reservoirs are effective reservoirs, and Type IV reservoirs are ineffective reservoirs (called barrier zones). The reservoir grade division of a certain reservoir is shown in Table 1:

[0028] Table 1 Classification table of a certain reservoir

[0029]

[0030] Step 2: Use reservoir numerical simulation software (Eclipse, CMG can be used) to establish the interactive layer model of effective reservoir entrainment barrier zone. The interactive layer model nee...

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Abstract

The present invention relates to an optimization method for staged fracturing of horizontal wells in tight reservoirs with strong heterogeneity: divide the reservoir levels; use software to simulate the pressure wave situation after 3 years of production in an interactive layer model containing barrier zones for arranging hydraulic fractures , to obtain the permeability of different barrier zones and the corresponding limit width, and judge whether it is necessary to divide the effective reservoirs on both sides of the barrier zone into two independent seepage units by fitting the relationship between them; Economic limit productivity, determine the economic limit seepage unit width of different grades of reservoirs; simulate the pressure wave propagation after 3 years of production under the condition of different hydraulic fracture spacing in the same continuous sand body, and determine the fracture spacing; according to the logging interpretation results and Reservoir level division standard divides the horizontal section into multiple reservoir units; combined with the limit width of the seepage unit division and the reasonable spacing requirements of continuous sand body fractures, a variety of hydraulic fracture layout schemes are set on the horizontal section, and the economical and effective layout is selected. sewing scheme.

Description

technical field [0001] The invention belongs to the technical field of hydraulic fracturing, and relates to an optimization method for staged fracturing of horizontal wells in tight reservoirs with strong heterogeneity. Background technique [0002] There are a large number of tight sandstone reservoirs with strong heterogeneity in my country, especially the fluvial sedimentary sandstones widely distributed in the Ordos Basin and Sichuan Basin, which have the characteristics of large reserves, thin thickness, large lateral changes in physical properties, and tightness. Stage fracturing is one of the most effective development methods for this type of reservoir. However, the key to economical and effective mining is how to arrange hydraulic fractures reasonably on such horizontal sections with strong heterogeneity. [0003] For tight reservoirs with strong heterogeneity, reservoirs of different physical property grades will alternately appear in the horizontal section, and th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F111/10G06F119/14
CPCG06F2111/10G06F2119/06G06F30/20
Inventor 肖晖
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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