Zonation method of thin interbed in low infiltration of fracturing layer segment

A technology for fracturing intervals and thin interlayers, which is applied in earth-moving drilling, fluid production, wellbore/well components, etc. Layer selection effect

Inactive Publication Date: 2009-07-22
DAQING OILFIELD CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the judgment of the shielding ability of the interlayer is inaccurate, the fracturing scale will be out of control. If the cracks extend too much into the bottom layer, it will cause low production after fracturing, rapid decline, and short validity period, which will affect the effect of fracturing. ; For thin interlayers, if the fracturing section is close to the high aquifer layer, the blocking effect of the interlayer is overestimated, and the pressure through the interlayer will cause water flooding; if the blocking ability of the interlayer is underestimated, the The range of well selection and layer selection for fracturing makes some well layers lose opportunities for stimulation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Zonation method of thin interbed in low infiltration of fracturing layer segment
  • Zonation method of thin interbed in low infiltration of fracturing layer segment
  • Zonation method of thin interbed in low infiltration of fracturing layer segment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1, Well Y51-4-S8, GIV6-10 has 6 sublayers in total, the oil layer span is 21.9m, and the largest interlayer is 3.1m. According to conventional technical standards, separate fracturing is not possible, see Table 1.

[0033] Data table of fracturing small layer of well Y51-4-S8

[0034]

[0035] according to figure 1 Gamma log curve, the gamma values ​​of the five interlayers are 130, 160, 120, 160, 130API from bottom to top, ≥120API, and the shale content is relatively high.

[0036] according to figure 1 Gamma logging curve, the high gamma value of five interlayers and the low gamma value of the oil layer, the difference between the two is ≥40API, and the shale content is high.

[0037] According to the characteristics of the oilfield in Block Ying 51, the thickness of the interlayer that meets the above two conditions must be greater than 2m. figure 1 According to the gamma ray logging curve, the effective shielding thickness of the interlayer between GI...

Embodiment 2

[0040] Example 2: Well L12-10 has 5 sublayers from SI1 to SI2-4+5, the span of oil layers is 15.1m, and the largest interlayer is 2.2m. According to conventional technical standards, it cannot be fractured in separate layers. See Table 2.

[0041] Table 2 Data sheet of fracturing sublayers in well L12-10

[0042]

[0043] According to the gamma logging curve, the gamma values ​​of the four interlayers are 124, 127, 136, 150API from bottom to top, and ≥120API, and the lithology meets the requirements.

[0044] According to the gamma logging curve, the difference between the high points of the gamma value of the four interlayers and the low point of the gamma value of the oil layer is ≥40API, which meets the standard of difference value

[0045] According to the characteristics of the Longhupao Gaotai sublayer, the thickness of the interlayer meeting the above two conditions should be greater than 2m. According to the gamma ray logging curve, the effective shielding thickness...

Embodiment 3

[0049]Example 3: Well Y51-10-Xie 10, F4-F5 consists of 3 sub-layers, the oil layer span is 12.5m, and the largest interlayer is 3.5m, which cannot be fractured in separate layers according to conventional technical standards, see Table 3.

[0050] Table 3

[0051]

[0052] According to the gamma logging curve, the gamma values ​​of the two interlayers are 160, 200API and ≥120API respectively from bottom to top, and the lithology meets the requirements.

[0053] According to the gamma logging curve, the difference between the high gamma value of the two interlayers and the low gamma value of the oil layer is greater than or equal to 40 API, which meets the difference value standard

[0054] According to the characteristics of the oilfield in Block Ying 51, the thickness of the interlayer that meets the above two conditions must be greater than 2m. According to the gamma ray logging curve, the effective shielding thickness of the interlayer between F4 and F5 is 3.3m, which me...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for delamination of low-permeability thin interbed fracturing intervals. The method includes the following steps: (1) determining an effective shielding layer, (2) performing interlayer protection: fracturing with low discharge rate, variable discharge rate and low thickener concentration, and (3) performing layered fracturing. According to the interlayer card packer, the single card layered fracturing construction is carried out. This method divides the fracturing intervals by referring to interlayer properties, interlayer thickness, and oil layer thickness. Layers with an in-situ stress difference greater than 4MPa and an interlayer thickness greater than 2m can be fractured in layers, which broadens the range of well selection and layer selection for layered fracturing, and improves the effectiveness of the scheme and the degree of oil layer stimulation.

Description

Technical field: [0001] The invention relates to a fracturing method for oil recovery in an oil field, in particular to a method for delamination of low-permeability thin interbed fracturing intervals. Background technique: [0002] The oil layers in low-permeability oilfields are mostly thin interbeds. The oil layers are not only thin but also the interlayers between layers are also thin, which brings certain difficulties to the layered fracturing reconstruction and seriously affects the fracturing effect. It is more important to judge the shielding effect of the barrier and control the fracture height, and it is also the difficulty and key to fracturing well selection, layer division and optimal design. In the original fracturing layer layering method, the requirements for interlayer thickness in small-scale hydraulic fracturing are generally greater than 15m for large-scale fracturing, and greater than 5m for small-scale fracturing, with a lower limit of 4m. Many small l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B49/00
Inventor 张传绪柴立新于永波尹喜永丛德军
Owner DAQING OILFIELD CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap