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Fracturing method for improving fracturing comprehensive sand ratio of low-permeability oil and gas reservoir

A low-permeability oil and gas reservoir and fracturing technology, which is used in earth-moving drilling, special data processing applications, and exploitation of fluids. The effect of increasing the effect

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

Therefore, in the traditional fracturing design method, the proportion of prefluid accounts for 35%-55% of the total fluid volume in a fracturing operation, and the comprehensive sand ratio in fracturing construction is about 8-13%. The amount of fracturing fluid used is relatively large, and the construction cost high

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  • Fracturing method for improving fracturing comprehensive sand ratio of low-permeability oil and gas reservoir
  • Fracturing method for improving fracturing comprehensive sand ratio of low-permeability oil and gas reservoir
  • Fracturing method for improving fracturing comprehensive sand ratio of low-permeability oil and gas reservoir

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[0031] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0032] According to a large number of laboratory tests and mathematical simulation calculations, it is shown that the sand-carrying fluid in the medium-low sand ratio stage has the functions of fracture creation and sand-carrying at the same time. This principle can be used to optimize the design of high-proportion pre-fluid in the conventional fracturing process. , in the early stage of fracture formation, the sand-carrying fluid in the medium-low sand ratio section was used for fracturing, which greatly increased the comprehensive sand ratio of the entire fracturing process, and the comprehensive sand ratio could reach about 15-25%. Liquid usage is reduced by 20%-40%.

[0033] Such as figure 1 as shown, figure 1 It is a flow chart of the fracturi...

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Abstract

The invention provides a fracturing method for improving a fracturing comprehensive sand ratio of a low-permeability oil and gas reservoir. The fracturing method for improving the fracturing comprehensive sand ratio of the low-permeability oil and gas reservoir includes the following steps: Step 1, carrying out process design according to geological data, the thickness of a reconstruction target layer, logging data and physical characteristics, lithologic characteristics and ground stress characteristics of the oil reservoir; step 2, optimizing the amount of pad fluid; step 3, carrying out sand adding in a main sand adding stage; step 4, carrying out fracturing site construction; and step 5, monitoring construction pressure. The fracturing method for improving the fracturing comprehensivesand ratio of the low-permeability oil and gas reservoir can well improve the comprehensive sand ratio in a process of fracturing of the low-permeability oil reservoir. In the construction process, sand is basically added in the basic process so as to reduce the amount of the fracturing agent, increase the effective flow guide cracking length of the fracturing and realize the effects of reducing the fracturing construction cost and improving the fracturing reconstruction yield increase.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a fracturing method for increasing the comprehensive sand ratio in fracturing of low-permeability oil and gas reservoirs. Background technique [0002] Fracturing is an important measure for the stimulation of low-permeability reservoirs at home and abroad, and increasing the average sand ratio in fracturing is an important method to effectively improve the conductivity of fracturing artificial fractures, thereby increasing the production of low-permeability oil and gas wells and reducing the cost of fracturing. [0003] For low-permeability oil and gas wells buried deeper than 2500m, conventional fracturing design and construction are based on traditional rock fracture formation and propagation models, such as PKN or GDK models; traditional model-guided fracturing design and construction are divided into obvious fracturing Pre-fluid, sand-carrying fluid and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267G06F17/50
CPCE21B43/267G06F30/20
Inventor 肖春金陈勇赵丹星刘承杰杨峰李晓倩陈凯黄波杨彪张茂森
Owner CHINA PETROLEUM & CHEM CORP
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