Method for increasing biological gasification rate of oil reservoir residual oil and application of method

A technology for residual oil and oil reservoirs, applied in chemical instruments and methods, drilling compositions, earth-moving drilling, etc., which can solve the problem of slow hydrocarbon microbial degradation gas production rate, unsatisfactory gas production rate, reaction rate limitation, etc. problems, to achieve the effect of increasing the rate of biogasification, saving energy, and improving the reaction efficiency

Active Publication Date: 2017-09-12
CHINA PETROLEUM & CHEM CORP +1
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the initial reaction of the anaerobic hydrocarbon degradation of hydrocarbons - the reaction of anaerobic degradation of hydrocarbon substrates to produce hydrogen and acetic acid, the Gibbs free energy change is positive (need to supply energy from the outside), that is, the reaction cannot be spontaneous Therefore, the anaerobic degradation reaction rate of hydrocarbons is largely limited by these reaction processes, resulting in very slow hydrocarbon degradati...

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 increasing biological gasification rate of oil reservoir residual oil and application of method
  • Method for increasing biological gasification rate of oil reservoir residual oil and application of method
  • Method for increasing biological gasification rate of oil reservoir residual oil and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In a depleted oil reservoir in a certain block of Henan Oilfield, multi-stage fracturing of horizontal wells has been implemented. There are 8 fracturing stages, and each stage (half-fracture length 100 meters, fracture height 30 meters, fracture width 10 mm, porosity 50%) Inject about 50m 3 Activator, a total injection of activator 400m 3 , The activator composition is 0.5g / L urea, 0.25g / L dipotassium hydrogen phosphate, 0.05g / L magnesium sulfate and 0.01g / L yeast extract. Propants made of conductive materials are used for hydraulic fracturing, and then wires are connected to a DC power supply at the bottom of the well to construct electrodes. Set adjacent segments as anode and cathode respectively, set anode voltage to -0.20V vs. reference electrode voltage (NHE), cathode voltage to -0.35V vs. reference electrode voltage (NHE), and apply voltage for 90 days. After stop applying voltage, use 4000m 3 Water was used for displacement, and after 180 days of boredom, the...

Embodiment 2

[0046] In a depleted oil reservoir in a certain block of Jiangsu Oilfield, staged fracturing of a single well was implemented, with 2 fracturing stages. The target reservoir is relatively shallow and is a horizontal fracture. Inject about 30m into each section (half slit length 80m, slit height 40m, slit width 6mm, porosity 50%) 3 Activator, a total injection of activator 60m 3 , The activator composition is 0.8g / L ammonium chloride, 0.50g / L dipotassium hydrogen phosphate, 0.08g / L magnesium sulfate and 0.01g / L beef extract. Propants made of conductive materials are used for hydraulic fracturing, and then wires are connected to a DC power supply at the bottom of the well to construct electrodes. Set the adjacent segments as the anode and the cathode respectively, set the anode voltage to -0.15V vs. 3 Water was used for displacement. After 150 days of boredom, the initial production of natural gas after the well was opened was 16,000 cubic meters per day.

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 method for increasing the biological gasification rate of oil reservoir residual oil. The method includes the following steps that firstly, an electrode is constructed in an oil reservoir; secondly, an aqueous solution of an anaerobic microbial activator is injected into the oil reservoir; thirdly, a micro-electric field is formed in the oil reservoir by applying voltage to the electrode so as to stimulate proliferation and metabolism of methanogens and syntrophism metabolic bacteria of the methanogens; fourthly, application of the voltage stops, a water-containing liquid is injected into the oil reservoir, and the methanogens and the syntrophism metabolic bacteria are displaced to the deep part of a stratum; fifthly, a well is opened to produce methane. The invention further relates to application of the method.

Description

technical field [0001] The invention relates to a method for increasing the rate, in particular to a method for increasing the rate in the oil reservoir field. The invention also relates to its use. Background technique [0002] With the rapid development of my country's national economy and the adjustment of energy structure, my country's energy demand is increasingly strong, and the contradiction between supply and demand is increasingly intensified: by the end of 2014, my country's annual imports of oil and natural gas reached 310 million tons and 45.7 billion cubic meters respectively, and the degree of dependence on foreign countries was respectively 59.6% and 25.6%. At present, 80% of my country's oil production capacity comes from water drive reservoirs, and onshore oilfields generally enter a high water cut period (47.3% and 43.5% of Sinopec and PetroChina's produced reserves have entered an ultra-high water cut period), according to the reserve-production ratio of 1...

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): E21B43/22E21B43/267C09K8/58
CPCC09K8/58E21B43/16E21B43/267
Inventor 郑承纲张汝生赵梦云王连生刘松林鑫
Owner CHINA PETROLEUM & CHEM 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