CN103883296A - Oxygen removal method for diluting heavy oil by injecting hydrogen peroxide - Google Patents

Abstract

The invention relates to the technical field of oxygen removal methods, in particular to an oxygen removal method for diluting heavy oil by injecting hydrogen peroxide. The method includes: removing oxygen with kill fluid, injecting a casing with sodium thiosulfate, and injecting the casing with pure deoxidant to remove the oxygen. The method has the advantages that oxygen molecules overflowing in oxidization can be removed from a shaft and operation is facilitated.

Description

A kind of deoxidation method that injects hydrogen peroxide dilution viscous crude

Technical field:

The present invention relates to deoxidation method technical field, be specifically related to a kind of deoxidation method that injects hydrogen peroxide dilution viscous crude.

Background technology:

The chemical formula of hydrogen peroxide is H₂o₂, also claim hydrogen peroxide, military project is defined as the harmless fuel of binary, civilian being defined as: weak acid strong oxidizer, concentration high for military project, content low for: dye cloth, papermaking, medical treatment etc.Application hydrogen peroxide need to possess necessary condition, can not contact with carbon molecule, and temperature is suitable, the hydrogen peroxide of 30% content is relatively stable in normal temperature, oxidizing condition is to contact with carbon molecule, and adds metal oxide, metal oxide to claim again " catalyzer ".

Oil is a kind of by the synthetic energy of multiple carbon component, it is to lean against under the pressure-acting on stratum automatically to flow to pit shaft just through manually rising to ground, viscous crude is higher because of colloid, asphalt content, in stratum, cannot automatically flow to pit shaft, people just adopt steam in stratum, to heat diluent stream to pit shaft artificial extraction again, but it has following shortcoming: one, extraction cost is high; Two, recovery ratio is low; Three, the steam generator blowdown on ground is serious.

Claim again to remain oxygen but any catalyzer all can produce oxygen molecule in the oxidation of hydrogen peroxide, have has less more, and oxidizing process has violent, also has gentlely, removes, otherwise easily blast but the residue oxygen of oxidation is essential.

Summary of the invention:

The object of this invention is to provide a kind of deoxidation method that injects hydrogen peroxide dilution viscous crude, the oxygen molecule that it can overflow oxidation is removed in pit shaft, and easy to operate.

In order to solve the existing problem of background technology, the present invention adopts following technical scheme: its deoxidation method is: adopt well killing fluid deoxygenation, and first by sodium thiosulfate sprue bushing, and then by pure oxygen scavenger sprue bushing.

The present invention has following beneficial effect: the oxygen molecule that oxidation can be overflowed is removed in pit shaft, and easy to operate.

Brief description of the drawings:

Fig. 1 is hydrogen peroxide injection pressure curve map in the present embodiment;

Fig. 2 is valve pit pressue-graph in the present embodiment;

Fig. 3 is open flow curve map in the present embodiment.

Detailed description of the invention:

This detailed description of the invention adopts following technical scheme: its deoxidation method is: adopt well killing fluid deoxygenation, and first by sodium thiosulfate sprue bushing, and then by pure oxygen scavenger sprue bushing.

Application of the hydrogen peroxide dilutes the favourable fraud that also has in viscous crude, its drawback is exactly to require high to variations in temperature, after oxidation, overflow and in gas, contain oxygen molecule, carbon in gas, oxygen runs into spark and easily blasts, any catalyzer has oxygen molecule to produce in the oxidation of hydrogen peroxide, just have and have less more, have violent, have gentle, so adopt three kinds of measures when application hydrogen peroxide: one, gentleness while selecting oxidation relatively, produce the few catalyzer of residue oxygen, two, overflow oxygen molecule deoxygenation in pit shaft for remaining oxidation, the sodium thiosulfate of pit shaft Lower Half that Here it is, the pure oxygen scavenger of the first half, three, again residue even ten thousand/ oxygen molecule in the process of circulation, not allow it produce some sparks or Mars yet.

Embodiment:

Application hydrogen peroxide carries out viscous crude dilution, injects 120 tons of some hydrogen peroxide, and three phases is divided in front and back:

1, the injection stage: adopt segmentation to beat crowded, inject and adopt two 400 type pump trucks, each period (containing well killing fluid) uninterruptedly clamp-ons five kinds of different medicaments, shares 8hours 20 minutes.As shown in Figure 1.

2, the vexed well stage: vexed well 114 hours altogether, every 2 hourrecord pressure curve 1 time.Have converse curve with the full simulated experiment of vexed well, in full simulated experiment, by 2 metal pipe line simulate formation oxidizing process, because oxidizing process is a Lattice Oxygen heat release, heat build-up process, be subject to spatial limitation, the heat of generation and gas impel limited space pressure to rise.On-the-spot down-hole formation belongs to the loose heavy oil tested layer of 8m of covering layer and underlying bed folder, and heat and gas that oxidizing process produces spread to oil reservoir, as shown in Figure 2.

3, induced flow (open flow) stage: shorter this section time, mainly by the pressed gas in tubing string after oxidation and casing pressure air release out, but this stage belong to the Main Stage that this viscous crude of inspection dilutes.After 2004, the San Koujing being presided over by Dongying City Huanglong and the academician of the Chinese Academy of Sciences has two mouthfuls of wells to blast in this stage, and can the safety problem that solve this stage be to be related to hydrogen peroxide enter the key that viscous crude is produced.This one-phase shares 39 minutes, and the gas that discharges out, because the not concrete sampling condition in scene does not have sample analysis, can only be waited until the sampling of end opening well and analyze.As shown in Figure 3.

Implement viscous crude dilution by current application hydrogen peroxide, draw the following conclusions:

1, it is investigated state, the inside and outside data of readding, this is that in oil history, first successful Application hydrogen peroxide injects the practical well that heavy oil tested layer carries out viscous crude dilution, has confirmed that current petroleum industry is feasible to hydrogen peroxide dilution viscous crude in viscous crude development.

2, carry the oil sample that oil pipe takes out of from above and see, viscous crude has not only produced dilution owing to being heated, also because chemical functional is successfully converted into little molecule by large molecule.Show that from these two kinds of functions recovery ratio can increase substantially.

3, any include in practical scientific research project safety in production must be put go to first place research; Research and application on theoretical (paper), in producing, there is a big difference, without technique, theoretic detailed Exploration and Research, firmly can not use in actual applications.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (1)

1. a deoxidation method that injects hydrogen peroxide dilution viscous crude, is characterized in that its deoxidation method is: adopt well killing fluid deoxygenation, first by sodium thiosulfate sprue bushing, and then will in pure oxygen scavenger sprue bushing, carry out deoxygenation.

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