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Horizontal seam secondary steering volume fracturing method and application thereof

A volume fracturing and horizontal fracture technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of sand adding difficulties, unmentioned, unmentioned, etc., and achieve the expansion of oil drainage area, Improves the effect of transforming volume

Pending Publication Date: 2022-03-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent CN108457637A discloses a shallow sandstone oil and gas reservoir fracturing method, on the basis of judging the fracture shape, adopts the orthogonal design method, and applies mature oil and gas reservoir numerical simulation software to optimize the corresponding fracture length, conductivity and level The number of fractures, etc.; on this basis, according to the expansion law of different fracture shapes, optimize the perforation section and perforation parameters; the purpose of this patent is to prevent the formation of horizontal fractures or T-shaped fractures from being difficult or appearing in the fracturing process. sand plugging situation, but no mention of how to form nearly circular balanced horizontal seams how to form vertical seams
This document only introduces the fracturing fluid system suitable for shallow fracturing, and does not mention the optimization of parameters such as fracturing design and construction for the entire shallow fracturing

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  • Horizontal seam secondary steering volume fracturing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Well X is a tight sandstone oil well. The well is a vertical well with a depth of 386m in the middle of the reservoir. The lithology of the reservoir is brown-gray fine sandstone. -3 μm 2 , porosity 12.2%, oil saturation 50.0%, Young's modulus 13292MPa, average Poisson's ratio 0.25, original formation pressure 2.06MPa, pressure coefficient 0.6, formation temperature 34.5°C, temperature gradient 2.7°C / 100m. The specific implementation process of the well is as follows:

[0079] 1) Evaluation of key reservoir parameters

[0080] The physical properties, sensitivity, rock mechanics and three-dimensional stress of the reservoir were analyzed and evaluated in detail, and the fractures formed in the well were determined to be horizontal fractures.

[0081] 2) Calculation of geological engineering sweet spot and determination of perforation position

[0082] On the basis of step 1), the optimal perforation positions are determined to be 383m-384m and 388m-389m according to ...

Embodiment 2

[0108] Well X is a tight sandstone oil well. The well is a vertical well with a depth of 326m in the middle of the reservoir. The lithology of the reservoir is brown-gray fine sandstone. -3 μm 2 , porosity 10.1%, oil saturation 46.8%, Young's modulus 14376MPa, average Poisson's ratio 0.24, original formation pressure 1.97MPa, pressure coefficient 0.63, formation temperature 31.7°C, temperature gradient 2.7°C / 100m. The specific implementation process of the well is as follows:

[0109] 1) Evaluation of key reservoir parameters

[0110] The physical properties, sensitivity, rock mechanics and three-dimensional stress of the reservoir were analyzed and evaluated in detail, and the fractures formed in the well were determined to be horizontal fractures.

[0111] 2) Calculation of geological engineering sweet spot and determination of perforation position

[0112] On the basis of step 1), according to the calculation method of geological sweet spot and engineering sweet spot ind...

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Abstract

The invention discloses a horizontal seam secondary steering volume fracturing method and application thereof, and the method comprises the following steps: injecting a small-particle-size ultra-low-density propping agent for seam end plugging to complete primary steering in a horizontal seam, then injecting a small-particle-size low-density propping agent for filling the horizontal seam for secondary steering, and then injecting fracturing fluid for full extension of a vertical seam. According to the method, the vertical seam is formed on the basis of the horizontal seam and effectively extends, the overall transformation size of the seam is increased, and a complex seam network in which the horizontal seam and the vertical seam coexist is completed through repeated operation. Fracture parameters and construction parameters are optimally designed through reservoir numerical simulation and fracture propagation simulation software, the adding modes of fracturing fluids with different viscosities and proppants with different particle sizes are optimized, a complex fracture network with good flow conductivity is finally formed, and the yield increasing and stabilizing effects after fracturing are improved.

Description

technical field [0001] The invention belongs to the field of fracturing, in particular to the technical field of fracturing reconstruction of shallow tight sandstone oil and gas reservoirs, and more specifically relates to a new method suitable for secondary steering volume fracturing of horizontal fractures in shallow tight sandstone oil and gas reservoirs. Background technique [0002] After years of research, the fracturing stimulation technology of medium-deep and deep oil and gas reservoirs has become increasingly mature, and has formed a comprehensive system in the aspects of pre-fracture evaluation, fracturing tool research and development, fracturing technology, fracturing fluid damage mechanism, new fracturing materials and fracture monitoring technology. Technology series and supporting technology. However, shallow oil and gas reservoirs are widely distributed in China, such as Ordos Weibei Oilfield, Yanchang Oilfield Qilicun Oilfield, Jilin Changling Oilfield and ...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/26E21B43/267
Inventor 蒋廷学吴春方路保平刘建坤王宝峰
Owner CHINA PETROLEUM & CHEM CORP
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