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

Reservoir transformation method for igneous rock thickened oil reservoir

A technology for reservoir stimulation and heavy oil reservoirs, applied in the field of oil exploitation, can solve the problems of inability to effectively improve formation permeability, unsatisfactory stimulation effect, and inability to transform igneous rock heavy oil reservoirs, etc., to meet the requirements of crude oil viscosity reduction, The effect of improving formation permeability and widening crude oil flow channels

Active Publication Date: 2019-05-21
PETROCHINA CO LTD
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle is to use chemical viscosity reducer to reduce the viscosity of heavy oil. This technology cannot effectively improve the formation permeability, and the stimulation effect is still unsatisfactory.
[0007] In summary, none of the existing reservoir stimulation methods can effectively stimulate igneous heavy oil 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
  • Reservoir transformation method for igneous rock thickened oil reservoir
  • Reservoir transformation method for igneous rock thickened oil reservoir
  • Reservoir transformation method for igneous rock thickened oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] In this embodiment, reservoir stimulation is performed on Well Zi 101. Well Zi 101 belongs to igneous rock heavy oil reservoir. The wellbore temperature of the well is 50°C to 60°C. The lithology of the well is glassy basalt of igneous rock, without phenocrysts, and the matrix is ​​interstitial structure, with plagioclase microcrystals and glass. The muddy phenomenon on the rock surface is serious, see muddy clumps. The initial conditions of its crude oil are shown in Table 1.

[0086] Table 1. Initial physical property data of crude oil from Well 101

[0087]

[0088] According to the physical properties of the reservoir and crude oil, the autogenous heat viscosity reduction acidification process is adopted, and the specific construction pumping procedures are shown in Table 2. Among them, the self-generating heat solution A is sodium nitrite solution, the self-generating heat solution B is ammonium chloride and hydrochloric acid solution, the chemical huffing a...

Embodiment 2

[0094] In this embodiment, reservoir reconstruction is carried out on Well 103. Well Zi 103 belongs to igneous rock heavy oil reservoir. The wellbore temperature of the well is 50°C to 60°C. The lithology of the well is igneous gray-black oil spot basalt, the rock color is relatively uniform, the composition is mainly plagioclase, rich in lime particles, aphanitic structure, dense and hard; the cuttings are massive. Oil-bearing cuttings account for 2% of the cuttings, and 5-15% of the named cuttings, and the occurrence is spotty. Fluorescence dark yellow under wet and dry light, bright yellow under drip light, uneven appearance, series comparison of 10 grades. The initial conditions of its crude oil are shown in Table 3.

[0095] Table 3 Initial physical property data of crude oil from Well 103

[0096]

[0097] According to the physical properties of the reservoir and crude oil, the autogenous heat viscosity-reducing acidification process is adopted, and the specific c...

Embodiment 3

[0103]In this embodiment, reservoir reconstruction is carried out on Well Jun 101. Well Jun 101 belongs to igneous rock heavy oil reservoir. The wellbore temperature of the well is 50°C to 60°C. The lithology of the well is igneous gray-black oil spot basalt, the rock color is relatively uniform, the composition is mainly plagioclase, rich in lime particles, aphanitic structure, dense and hard; the cuttings are massive. The initial conditions of its crude oil are shown in Table 5.

[0104] Table 5 Initial physical properties data of crude oil in Well Jun 101

[0105]

[0106] According to the physical properties of the reservoir and crude oil, the autogenous heat viscosity-reducing acidification process is adopted, and the specific construction pumping procedures are shown in Table 6. Among them, the self-generating heat solution A is sodium nitrite solution, the self-generating heat solution B is ammonium chloride and hydrochloric acid solution, and the chemical huffing...

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
Viscosityaaaaaaaaaa
Viscosityaaaaaaaaaa
Viscosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a reservoir transformation method for an igneous rock thickened oil reservoir, and belongs to the technical field of oil exploitation. The reservoir transformation method comprises the steps of respectively injecting a self-heating solution A and a self-heating solution B into a target stratum through an oil pipe and a sleeve, so as to reduce the viscosity of crude oil in the igneous rock thickened oil reservoir by utilizing heat released by reaction of the self-heating solution A and the self-heating solution B; and selectively injecting chemical huff and puff viscosity reduction fluid and acid liquor into the target stratum according to the actual situation of the igneous rock thickened oil reservoir, so as to further reduce the viscosity of crude oil, improve thestratum permeability, achieve communication or prolonging of stratum cracks, and widen a crude oil flowing channel. By the adoption of the reservoir transformation method, the crude oil viscosity reduction requirement is met, the purpose of unblocking is achieved, the igneous rock heavy oil reservoir can be effectively transformed, and the crude oil viscosity reduction rate can reach 95% or more.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a reservoir reconstruction method for igneous rock heavy oil reservoirs. Background technique [0002] Igneous rocks are directly solidified from magma, which makes igneous rock reservoirs have different petrological and fluid characteristics from other types of reservoirs, especially igneous heavy oil reservoirs due to their high density, high viscosity, high colloidal bitumen, The characteristics of low wax content and low freezing point have become difficulties in exploration and development. Therefore, it is necessary to transform the igneous rock heavy oil reservoir to improve the development effect of the igneous rock heavy oil reservoir. [0003] At present, the methods for improving igneous heavy oil reservoirs mainly include: [0004] (1) Fracturing technology. The principle of this technology is to use fracturing hydraulic pressure to open the formatio...

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): E21B43/24E21B43/22
Inventor 王津建蔡晴琴杨太伟程诗睿郭树召杨扬闫钰
Owner PETROCHINA CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com