Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for improving recovery efficiency by ion matching water drive

A recovery factor, ion technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problem of no evaluation method and so on

Active Publication Date: 2015-05-20
PETROCHINA CO LTD
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is currently no suitable evaluation method for the enhanced oil recovery effect of waterflooding water used in low-permeability sandstone reservoirs

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 improving recovery efficiency by ion matching water drive
  • Method for improving recovery efficiency by ion matching water drive
  • Method for improving recovery efficiency by ion matching water drive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0051] This example provides a method for enhanced oil recovery by ion-matched waterflooding, wherein the crude oil used is degassed crude oil from Well Changqing Xi 137, the viscosity at 65°C is 9.0mPa·s, and the core is Xi 137 Reservoir core for the well at 65°C. The analysis results of core minerals are shown in Table 1. The experimental results show that the reservoir cores of Well Xi 137 have a high content of clay minerals, mainly chlorite and kaolinite. The analysis results of crude oil components used in the experiment are shown in Table 2, mainly saturated hydrocarbons, but with a small amount of non-hydrocarbons and asphaltenes. The composition analysis results of original formation water and ion-matched water are shown in Table 3. The overall salinity of ion-matched water is relatively low, but a small amount of divalent anions are added. Table 4 shows the Zeta potential test results of the interface between the original formation water and ion-matched water system...

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

PropertyMeasurementUnit
Salinityaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for improving recovery efficiency by ion matching water drive. The method comprises the steps of detection of a target low-permeability sandstone oil pool, selection of ion matching water, core fluidity test and the like. The method uses the low-permeability sandstone oil pool as an object, uses the deepening of ion matching water drive-oil / water / rock microcosmic action mechanism as a target, overcomes an ion matching water drive pressure reduction and injection increment technology, breaks through the bottleneck of a technology for improving the recovery efficiency by low-permeability oil pool, builds a technology for improving the recovery efficiency by the low-permeability sandstone oil pool with ion matching water as a carrier, and forms a technology for improving oil displacement efficiency by ion matching water drive with proprietary intellectual property rights.

Description

technical field [0001] The invention relates to a method for enhancing recovery by ion-matched water flooding, and belongs to the technical field of petroleum exploitation. Background technique [0002] Oilfield water injection is one of the simplest and most effective methods to replenish formation energy and establish a displacement pressure system, and it is also the main technology for increasing production in most oil fields. Moreover, water flooding will remain the main technology for global oilfield development for a long time. The importance of low-permeability and ultra-low-permeability reservoir development is evident through the analysis of reserve composition and production contribution. With the continuous deepening of development, the economical and effective development of low-permeability oilfields still faces multiple challenges such as production decline and recovery, oil recovery index decline and liquid extraction to stabilize oil, establishment of effect...

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): E21B43/20
CPCE21B43/20
Inventor 谢全伍家忠刘庆杰马德胜
Owner PETROCHINA CO LTD