A Completion Method of Volumetric Fracturing for Horizontal Wells in Unconventional Reservoirs

A volume fracturing and horizontal well technology, applied in wellbore/well components, production fluid, earthwork drilling and production, etc., can solve the problem of insufficient consideration of reservoir heterogeneity, perforation and productivity matching three-dimensional stress, geological Reserves have not been effectively produced, and there are large differences in fluid flow into pores between clusters, etc., to achieve the effects of increasing the fracture control area, shortening the interval between clusters, and reducing the driving pressure difference

Active Publication Date: 2020-07-31
PETROCHINA CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A large number of production logging and downhole imaging data at home and abroad show that multi-cluster perforation horizontal well fracturing does not fully consider reservoir heterogeneity and perforation in stages, regardless of whether bridge plugs or in-pipe packers are segmented. Matching productivity, the influence of three-dimensional stress and inter-fracture stress interference on inter-cluster fracture pressure, etc., during fracturing, there is a large difference in fluid inflow between clusters, resulting in a considerable part of the perforation clusters in the horizontal well section not being depressurized, and the geological reserves have not been effectively obtained. There is a large gap between the fracturing effect and the geological expectation, and there is a problem of low single well recovery

Method used

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  • A Completion Method of Volumetric Fracturing for Horizontal Wells in Unconventional Reservoirs
  • A Completion Method of Volumetric Fracturing for Horizontal Wells in Unconventional Reservoirs
  • A Completion Method of Volumetric Fracturing for Horizontal Wells in Unconventional Reservoirs

Examples

Experimental program
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Effect test

example 1

[0118] Example 1: Reduced section, cluster spacing + nano-fracturing fluid for oil wells + high-strength sanding of quartz sand throughout the process

[0119] Fuyu tight oil in Songliao Basin-shortening section and cluster spacing, increasing interference between fractures and forming complex fractures;

[0120] Fuyu tight oil area in Songliao Basin: 10,000km 2

[0121] Burial depth of oil layer: 1850~2600m

[0122] Reservoir thickness: 2~10m (the thickest is 40m)

[0123] Single well production: 0.5~3t / d, up to 20t / d

[0124] Physical properties: porosity 6% ~ 10%, permeability 0.01 ~ 1mD

[0125] Properties of crude oil: Density 0.8~0.86g / cm 3 , Viscosity: 3~15mPa·s

[0126] Formation pressure coefficient: 0.97~1.06

[0127] Excellent source-reservoir configuration relationship is the key to the formation of Fuyu tight oil

[0128] The Fuyu oil layer is upper-generation and lower-reservoir: the source-reservoir is close to the

[0129] Hydrocarbon source rock: Huxi...

example 2

[0134] Example 2: Subdivided small layers + fine segmented hole layout + targeted fracturing technology

[0135] JY52-6HF-subdivided small layer, fine segmented hole layout, one section one strategy

[0136] Table 7 shows JY52-6HF-subdivided sub-layers and fine segmented hole layout data. It can be seen from Table 7 that the structure is complex, the buried depth increases (2883-3861m), and the span of the traversed horizon is relatively large (①-⑨ layers, streams grass ditch).

[0137] Table 7 JY52-6HF-subdivision sublayer, fine segment hole layout data

[0138] Hashtag structure walk through layers vertical depth(m) Horizontal section length (m) number of segments 5HF Wujiang Broken Nose ①-⑨turbidity sand 3105-3200 1100.38 17 6HF White Horse Syncline ④-⑧ 3397-3647 1056 17 8HF Pingqiao Broken Anticline ③ 2883-3011 1585.55 22 69-2HF Diaoshuiyan syncline ①~⑦ Jiancaogou 3502-3722 1574 24 81-2HF Jiaoshiba a...

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Abstract

The invention provides an unconventional reservoir horizontal well crack reservoir controlling volume fracturing well completion method, and belongs to the field of oil and gas exploitation. The method adheres to the concept of geologic reservoir, fracturing transformation and mining mode integration, by shortening the cluster spacing, increasing the cracking density and improving the sand addingstrength, stratum switching without stopping of a pump is achieved through long-acting temporary plugging, 100% of perforation clusters are opened through pressing, bridge plugs are reduced or even avoided, crack reservoir controlling is enhanced, energy supplementing is achieved, and imbibition displacement is synchronized. By means of a crack control matrix unit, all reserves can be mined, the driving pressure difference required by oil gas in a matrix is greatly reduced, and available reserves are greatly increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a well fracture completion method for volumetric fracturing of horizontal wells in unconventional reservoirs. [0002] technical background [0003] A large number of production logging and downhole imaging data at home and abroad show that multi-cluster perforation horizontal well fracturing does not fully consider reservoir heterogeneity and perforation in stages, regardless of whether bridge plugs or in-pipe packers are segmented. Matching productivity, the influence of three-dimensional stress and inter-fracture stress interference on inter-cluster fracture pressure, etc., during fracturing, there is a large difference in fluid inflow between clusters, resulting in a considerable part of the perforation clusters in the horizontal well section not being depressurized, and the geological reserves have not been effectively obtained. There is a large gap between t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/26E21B43/261E21B43/267
Inventor 范宇曾波周拿云宋毅郭兴午杨兆中李小刚易良平陈守雨刘云锐赵仁凤
Owner PETROCHINA CO LTD
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