Method for increasing recovery ratio of thick oil

A recovery factor and heavy oil technology, applied in chemical instruments and methods, production fluids, earthwork drilling and production, etc., can solve problems such as inability to inject steam, low water recovery rate, difficult post-processing, etc., to improve flow rate performance, enhance oil recovery, and reduce production pressure difference

Inactive Publication Date: 2012-08-22
DESHI ENERGY TECH GRP CO LTD
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Effectively solve problems such as failure to inject steam (high steam injection starting pressure), difficulty in steam injection (high steam injection

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present invention is tested on-site in a well in Nanyang Oilfield, and the steps are: (1) Lower the steam injection pipe string, install the subcritical steam injection wellhead, adjust the production rod string to meet the steam injection requirements, and install the wellhead sealing device.

[0022] (2) Connect the ground steam injection pipeline and subcritical steam-water two-phase flowmeter. First, sweep the steam injection pipeline, and then test the pressure at the wellhead, and if it does not leak within 3 minutes, it is qualified.

[0023] (3) Note N 2 And compound chemical agents: Casing back injection N 2 5000Nm 3 , oil pipe is injecting N 2 15000 Nm 3 , the tubing is injected with 10 tons of oil-soluble viscosity and pour point depressant, 1 ton of high-temperature oil displacement agent, and then nitrogen injection of 10000Nm 3 . (4) Steam injection: The steam injection rate is 8-10t / h, the dryness of the steam injection wellhead is ≥70%, and the...

Embodiment 2

[0028] The present invention is applied on-site in Xinjiang Karamayhong 003 heavy oil block. The specific steps are: (1) Lower the steam injection pipe string, install the subcritical steam injection wellhead, adjust the production rod string to meet the steam injection requirements, and install the wellhead sealing device.

[0029] (2) Connect the ground steam injection pipeline and subcritical steam-water two-phase flowmeter. First, sweep the steam injection pipeline, and then test the pressure at the wellhead, and if it does not leak within 3 minutes, it is qualified.

[0030] (3) Note N 2 And compound chemical agents: Casing back injection N 2 4000Nm 3 , oil pipe is injecting N 2 20000 Nm 3 , the tubing is injected with 10 tons of oil-soluble viscosity and pour point depressant, 1 ton of high-temperature oil displacement agent, and 1 ton of foaming agent, and then injecting 5000Nm of nitrogen 3 .

[0031] (4) Steam injection: The steam injection rate is 8-10t / h, the...

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 provides a method for increasing the recovery ratio of thick oil. The method comprises the following specific steps of: injecting a steam injection string; connecting a ground steam injection pipeline with a subcritical steam-water two-phase flow meter, scanning the steam injection pipeline, testing the pressure of a well mouth and judging the pressure to be qualified if no pressure leaks after three minutes; inversely injecting a casing pipe; injecting steam into an oil pipe; after the steam is injected, mounting a temperature-resistant pressure gauge at the well mouth and starting to soak the well; and spraying by using an oil nozzle. Due to the utilization of gas, chemical and heat energy and actions of three substances, the mixed mass transfer action of the three substances in the longitudinal and transverse actions of an oil layer are exerted, the production pressure difference is reduced, the flowability of crude oil is improved, the oil-displacement power is increased, steam waves and the radius are increased, the saturation of residual oil is reduced and the aims of increasing the recovery ratio and improving the development effect are finally achieved.

Description

technical field [0001] The invention relates to an oil recovery method, in particular to a heavy oil recovery method, and belongs to the technical field of heavy oil development. Background technique [0002] Oilfields in my country have now entered the middle and late stages of development. In order to increase and stabilize production, each oilfield will continue to increase the production rate of heavy oil resources and invest a lot of money to support the development of heavy oil. Currently, it has been discovered in Shengli Oilfield, Liaohe Oilfield, and Xinjiang Oilfield. Large-scale heavy oil reservoirs have been discovered, and those with large reserves, shallow burial, and relatively low viscosity have been developed; since the viscosity of heavy oil is very sensitive to temperature, as long as the temperature rises (8-9°C), its viscosity will decrease. Therefore, it is often used to inject high-pressure saturated steam into the oil layer, swallow first and then spit ...

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): E21B43/16E21B43/24E21B43/22C09K8/58
Inventor 王黎明徐家业谷之辉崔仕章崔学章高瑞美薛军许继平刘忠艳
Owner DESHI ENERGY TECH GRP 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