Single-well parallel crack water injection and oil extraction method of offshore low-permeability reservoir

A technology of oil seepage and water injection, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of few oil and gas resources, difficult underground flow of oil and gas, poor reservoir permeability, etc.

Inactive Publication Date: 2015-08-05
CHINA NAT OFFSHORE OIL CORP +1
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since offshore oil and gas fields are located in a marine environment, production facilities and production wells need to be concentrated on offshore production platforms or wellhead platforms. Due to the constraints of platform construction and huge investment in drilling, offshore oil and gas fields can only be developed with a limited number of wells. The degree of recovery, rate of oil recovery and economy are limited to a certain extent
[0003] When developing offshore low-permeabi

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
  • Single-well parallel crack water injection and oil extraction method of offshore low-permeability reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The purpose of the present invention can be achieved by adopting the following technical scheme. The single-well parallel fracture water injection oil recovery method for offshore low-permeability reservoir development includes at least the main wellbore 1 and two oil production branches A3 and B4 in the reservoir 2, A water injection branch 5 is composed of a group of parallel artificial fractures A31, B41 and C51. The two oil production branches and water injection branches are both horizontal wells and extend along the direction of the maximum principal stress of the formation. The water branch is located between the two oil production branches, and the water injection branch and the oil production branch implement staged fracturing operations to generate artificial fractures.

[0012] The length of the oil production branch and the water injection branch and the distance between them are determined according to the production volume and the scale of the reservoir.

...

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 single-well parallel crack water injection and oil extraction method of an offshore low-permeability reservoir. A single well at least consists of a main well hole, and two oil extraction branches, a water injection branch and a set of parallel manual cracks positioned in a reservoir, wherein the oil extraction branches and the water injection branch are horizontal wells, and extend along a maximum main stress direction of a stratum; the water injection branch is positioned between the two oil extraction branches; the water injection branch and the oil extraction branches are subjected to the staged fracturing operation to generate the manual cracks parallel to shafts; the water injection operation is performed by the water injection branch positioned between the two oil extraction branches; and injected water diffuses along crack surfaces and enters the stratum after entering the manual cracks. The method has prominent effects on increment of the controlled reserve, reduction of the cost and improvement of the development effect in the development of the offshore low-permeability reservoir.

Description

technical field [0001] The invention relates to a water injection and oil recovery method for single well parallel fractures in an offshore low-permeability oil reservoir. technical background [0002] Since offshore oil and gas fields are located in a marine environment, production facilities and production wells need to be concentrated on offshore production platforms or wellhead platforms. Due to the constraints of platform construction and huge investment in drilling, offshore oil and gas fields can only be developed with a limited number of wells. The degree of recovery, rate of oil recovery and economy are limited to a certain extent. [0003] When developing offshore low-permeability reservoirs, due to poor reservoir permeability, it is more difficult for oil and gas to flow underground, and there are fewer exploitable oil and gas resources within the control range of a well. Due to investment restrictions in offshore oil production facilities and drilling and complet...

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): E21B43/26E21B43/20E21B43/30
CPCE21B43/26E21B43/20E21B43/30
Inventor 徐文江阎洪涛姜维东赵金洲李炎波王建丰
Owner CHINA NAT OFFSHORE OIL CORP
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