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Method for segmental fracturing seaming optimization of horizontal well with high heterogeneity and tight reservoirs

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, achieve the effect of improving production degree and economy, and reducing fracturing reconstruction

Active Publication Date: 2018-11-16
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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  • Method for segmental fracturing seaming optimization of horizontal well with high heterogeneity and tight reservoirs
  • Method for segmental fracturing seaming optimization of horizontal well with high heterogeneity and tight reservoirs
  • Method for segmental fracturing seaming optimization of horizontal well with high heterogeneity and tight reservoirs

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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 invention relates to a method for segmental fracturing seaming optimization of a horizontal well with high heterogeneity and tight reservoirs. The method includes the steps of dividing the reservoirs into different levels; using software for simulating pressure wave situations of an interaction layer model which is provided with barrier zones and used for arranging hydraulic fractures after three years of production, obtaining the permeability and corresponding limit width of the barrier zones, and fitting a relationship between the permeability and the corresponding limit width to determine whether not the effective reservoirs on both sides of each barrier zone need to be divided into two independent seepage units; on the basis of judgement on whether or not the economic limit production capacity can be achieved after fracturing for three years, determining the economic limit seepage unit width of the reservoirs different in level; simulating pressure wave propagation situations after three years of production under the condition that different hydraulic fracture spacings are set in the same continuous sand body, and determining the fracture spacings; according to logging interpretation results and reservoir level division standards, dividing a horizontal segment into multiple reservoir units; in combination with the division limit with of the seepage units and reasonablespacing requirements for the fractures of the continuous sand body, setting several hydraulic fracturing seaming schemes for the horizontal segment and preferentially selecting the economical and effective seaming schemes.

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 Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2111/10G06F2119/06G06F30/20
Inventor 肖晖
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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