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Method for improving effective paving of propping agents in large and thick reservoir

A proppant and reservoir technology, applied in the field of improving the effective laying of proppant in the vertical direction of hydraulic fractures, can solve the problems of low propping efficiency, poor fracturing effect, unreasonable fracturing construction methods, etc., to achieve effective laying setting, improving the transformation effect, and achieving the effect of effective support

Active Publication Date: 2011-08-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] In order to solve the problem that the existing fracturing technology in oilfields adopts unreasonable fracturing methods for large-thick and low-permeability reservoirs, resulting in low support efficiency and poor fracturing effect of thick (30-100m) reservoirs, according to the Due to the difference in physical properties in the vertical direction of thick reservoirs, the present invention provides a new method for improving the vertical effective laying of proppant in thick reservoirs

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  • Method for improving effective paving of propping agents in large and thick reservoir
  • Method for improving effective paving of propping agents in large and thick reservoir

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Embodiment 1

[0045]The fracturing interval of Well Yi 104-1 in Shengli Oilfield is 3698.2m to 3775.5m, and the thickness of the fracturing interval is 77.2m, which is a typical thick layer. The physical properties of the reservoir in the fracturing and fracturing section of the well are relatively uniform, and concentrated perforation is carried out at 3715m to 3735m near the middle and upper part of the thick reservoir. Fracturing adopts sanding technology with different density proppant combinations, high density: medium density: low density ceramsite proppant according to the ratio of 1.5:1:1, high density (1810kg / m 3 ) Ceramsite 48m 3 ; Medium density (1650kg / m 3 ) Ceramsite 32m 3 ; Low density (1470kg / m 3 ) Ceramsite 32m 3 In the process of fracturing, the way of adding sand in the fracturing process is to first pump high-density ceramsite, then pump medium-density ceramsite, and finally pump low-density ceramsite to add ceramsite proppant in order to effectively support all fract...

Embodiment 2

[0047] The fracturing interval of Well Yi 104-6 in Shengli Oilfield is 3724m-3785.5m, and the thickness of the fracturing interval is 61.5m, which is a typical thick reservoir. The upper No. 3 sub-layer (3727m-3760m) and the lower No. 5 sub-layer (3762m-3783.5m) of the fracturing section have good physical properties. Concentrated perforation is used for these two sub-layers respectively, and the perforated section is No. 3 The middle and upper part of the reservoir is 3731m-3744m and the middle and upper part of No. 5 reservoir is 3762m-3770m. The fracturing adopts sand adding technology with different density proppant combination, high density and low density ceramsite proppant according to the ratio of 2.7:1, high density (density 1810kg / m 3 ) Ceramsite 128m 3 and low density (1470kg / m 3 ) Ceramsite 48m 3 , the way of adding sand during the fracturing process is to add ceramsite proppant in the order of pumping high-density ceramsite first, and finally pumping low-densit...

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Abstract

The invention relates to a method for improving effective paving of propping agents in a large and thick reservoir. When the large and thick reservoir is perforated, with consideration that hydraulic fissures can be extended in the longitudinal direction and can be communicated with the whole reservoir during fracturing and with the consideration of the influence of the propping agents on the paving of the propping agents when the propping agents settle towards the bottoms of the fissures during propping agent conveying and according to the physical difference of the large and thick reservoirin the longitudinal direction, the large and thick reservoir is perforated in a centralized way; and during fracturing, the pavement of the propping agents in the hydraulic fissures can be adjusted by using a sand technology of combination of propping agents with different densities, different settlement speeds of the propping agents with different densities, and convective motion between sand carrying liquids with different densities, so that the propping agents can be effectively paved in the fracturing layer in the longitudinal direction according to the different requirements of physical properties of the reservoir on propping flow guidance capacities of fissures. The method can effectively overcome the defects of the prior art, and improve the propping efficiency, and the increase production effect of the improved reservoir fracturing.

Description

Technical field: [0001] The invention relates to a method for improving the effective laying of proppant in the vertical direction of hydraulic fractures in the process of fracturing and reforming in the field of oil and gas field development. Specifically, it relates to a method that is mainly used in thick and low-permeability reservoirs to improve the effect of fracturing and increasing production. Methods. Background technique: [0002] During the exploration and development of low-permeability reservoirs, thick reservoirs are usually encountered, especially in low-permeability glutenite reservoirs, the reservoirs are generally thick, the interlayers are thin, there is no effective barrier, and the fracture height formed by hydraulic fracturing It cannot be controlled at all. The fractures formed by hydraulic fracturing are usually tens of meters or even hundreds of meters high. If conventional hydraulic fracturing methods are used for this type of reservoir, the proppan...

Claims

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Application Information

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IPC IPC(8): E21B43/267
Inventor 郭建春毕义泉卢聪赵志红
Owner SOUTHWEST PETROLEUM UNIV
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