Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for performing comprehensive classified evaluation on ultralow-permeability oil reservoir

An evaluation method and oil-penetrating technology, applied in earth-moving drilling, wellbore/well components, etc., which can solve problems such as single consideration factors, large differences in research results, and incompleteness.

Active Publication Date: 2020-01-03
PETROCHINA CO LTD
View PDF10 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Previous studies on reservoir classification mainly focused on the selection of "geological sweet spots" (i.e. favorable areas for development). It is also in line with the oil reservoir block selected by the "engineering sweet spot", realizes the beneficial development of the oil reservoir, and improves the development level of the oil reservoir. At present, there is no corresponding evaluation method
At the same time, there are more and more factors for reservoir evaluation at home and abroad. Previous researches mainly focused on the research on single factor or single aspect of reservoir classification evaluation, such as the single aspect of "geological sweet spot" or "engineering sweet spot". In the analysis, due to the single and incomplete consideration factors, the overall research results are quite different from the actual development, and it is difficult to apply them in the actual development process

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
  • Method for performing comprehensive classified evaluation on ultralow-permeability oil reservoir
  • Method for performing comprehensive classified evaluation on ultralow-permeability oil reservoir
  • Method for performing comprehensive classified evaluation on ultralow-permeability oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] refer to figure 1 and figure 2 , a method for comprehensive classification and evaluation of ultra-low permeability reservoirs, comprising the following steps:

[0044] Step 1: For the completed oil wells in different production ranges of the same reservoir, first select the type of parameters that characterize the compressibility of ultra-low permeability reservoir rocks;

[0045] Step 2: According to the size of the compressibility parameter values ​​of different types in the reservoir rock compressibility parameters in step 1, first perform normalization processing, and then use the analytic hierarchy process to determine the impact of various compressibility parameters on the reservoir rock The weight value of the impact of compressibility, and calculate the compressibility coefficient FI of formation rock;

[0046] Step 3: For the drilled oil wells under different productivity ranges in the same reservoir, select the type of characteristic parameters that charac...

Embodiment 2

[0052] refer to figure 1 and figure 2 , a method for comprehensive classification and evaluation of ultra-low permeability reservoirs, comprising the following steps:

[0053] Step 1: For the completed oil wells in different production ranges of the same reservoir, first select the type of parameters that characterize the compressibility of ultra-low permeability reservoir rocks;

[0054] The compressibility parameter type in the step 1 includes positive index parameters and negative index parameters;

[0055] The positive index parameters include: the brittleness index B of the reservoir rock I and natural fracture development degree D F ;

[0056] Negative indicator parameters include: clay mineral content W mc , horizontal and two-dimensional in-situ stress difference Δσ and rock fracture toughness K C .

[0057] Step 2: According to the size of the compressibility parameter values ​​of different types in the reservoir rock compressibility parameters in step 1, firs...

Embodiment 3

[0078] refer to image 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In this example, the production data of exploration wells and evaluation wells in Chang 6 ultra-low permeability reservoirs in the YC area of ​​the Ordos Basin were used to verify the effects of reservoir classification and evaluation. Due to the abundant coring data of exploratory wells and evaluation wells and the high reliability of electrical logging data, the logging data of exploratory wells and evaluation wells in the Chang 6 layer in the study area were collected first. Taking the Chang 6 reservoir data of Well H300 in the YC area as an example, Chang 6 Brittleness index B I , Horizontal two-direction ground stress difference Δσ = maximum horizontal ground stress - minimum horizontal ground stress, pore pressure p p , rock density ρ, shear wave time difference ΔT, and electrical gamma value GR can be obtained by array acoustic logging (eg image 3 ); the degree of development of natural fr...

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 the technical fields of oil reservoir research and oil reservoir classified evaluation, in particular to a method for performing comprehensive classified evaluation on an ultralow-permeability oil reservoir. Relation between a stratum rock compressible coefficient and a crude oil reservoir permeability coefficient is established by analyzing various parameters such as therock fracture mechanics of the ultralow-permeability oil reservoir, the flow characteristic of the crude oil and geological reserve scale. A relation chart between the compressible coefficient of crude oil reservoir rock and the reservoir permeability coefficient of the crude oil under different single-well productivity by statistics of various related parameters of the same kind of oil reservoirdevelopment zone which has finished drilling, and oil reservoir comprehensive evaluation and productivity prediction analysis can be carried out by the chart. Through establishment of the comprehensive classified evaluation chart, basis is provided for rapid zone selection and productivity prediction of the same kind of ultralow-permeability oil reservoir, so that a good guiding function of realizing new zone production and efficient development is achieved. The method has the characteristics of simplicity, practicability and high operability and can be applied to other ultralow-permeability oil reservoir classified evaluation research.

Description

[0001] Technical field [0002] The invention relates to the technical field of oil reservoir research and oil reservoir classification evaluation, in particular to a method for comprehensive classification evaluation of ultra-low permeability oil reservoirs. Background technique [0003] Changqing Oilfield’s ultra-low-permeability reservoirs have great potential for reserves and resources. With the large-scale development in recent years, the physical properties of the reservoirs in the development area have deteriorated year by year. Reservoirs turned to ultra-low permeability type III or tight reservoirs with low porosity and low permeability. Due to the typical characteristics of this type of reservoir, such as lower reservoir physical properties, various types of storage space, and strong heterogeneity, it is more difficult to extract crude oil from the formation, and oil wells must rely on a certain scale of fracturing to increase production. Obtain industrial oil strea...

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
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 高武彬王博宋鹏屈雪峰谢启超刘建陈小东陈霖马静路敏程国峰
Owner PETROCHINA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com