CN101979825A

CN101979825A - Process technology for complex blockage removal of chlorine dioxide

Info

Publication number: CN101979825A
Application number: CN2010102957832A
Authority: CN
Inventors: 李长根
Original assignee: SHANSHAN CHINA OIL TECHNOLOGY SERVICE Co Ltd
Current assignee: SHANSHAN CHINA OIL TECHNOLOGY SERVICE Co Ltd
Priority date: 2010-09-29
Filing date: 2010-09-29
Publication date: 2011-02-23
Also published as: CN102559163A

Abstract

The invention discloses process technology for complex blockage removal of chlorine dioxide. An oil field is developed in the middle and later periods, the decrease of strata pressure is large, the water absorbing capacity of a flooding well is reduced continuously, and particularly the situation becomes more serious after the re-flooding of oilfield sewage, so the oilfield flooding development effect is influenced to a great extent. Aiming at the problem that the effect of acidification augmented injection becomes poor, in the process technology, reasons are analyzed, the physical and chemical properties of the chlorine dioxide and a process principle for the blockage removal of the chlorine dioxide are researched by taking home and abroad experiences as reference, and the degradation to organic substances and the sterilizing effect to saprophytic bacteria and sulfate reducing bacteria of the chloride dioxide are evaluated through indoor tests; besides, the process technology is applied to oilfield field experiments, and results show that the process technology has very significant economic benefit and social benefit.

Description

The chlorine dioxide COMBINATION PLUG REMOVAL TECHNOLOGY ABOUT

Affiliated technical field

Patent of the present invention relates to a kind of novel measure of reservoir stimulation augmented injection, is applied to the serious organic increasing yield and injection technology of polluting reservoir.

Background technology

Along with oil field development enters the middle and later periods, because long-term injecting water, especially inject underproof sewage to the stratum, and the influence that descends of some underground work measure and formation temperature, pressure, the down-hole situation variation of water injection well, the type that formation contaminant stops up is complicated, diversified, can be divided three classes substantially:

The one, inorganic matter stops up, as, carbonate scale, clay particle, ferrous metal corrosion thing etc.;

The 2nd, organic matter stops up, as, high molecular polymers such as asphalitine, colloid, fracturing fluid, profile control agent;

The 3rd, biological bacterium stops up, as the thalline and the metabolite thereof of sulfate reducing bacteria (SRB), saprophytic bacteria (TGB) breeding.After bacterium enters the stratum, as long as condition is suitable, will breeds in a large number and exist with the form of bacterium network, bacterium network volume is bigger, and is serious to the pore throat injury.Saprophytic bacteria and iron bacteria can both produce mucus, and mucus is not only stopped up the stratum, and for sulfate reducing bacteria provide local anaerobism around, make its growth and breeding faster;

Conventional acidifying can be removed the permeability injury that most of inorganic matter causes the stratum, but to the obstruction to the stratum of high molecular polymer, biological bacterium and metabolite thereof, effect is relatively poor.According to foreign experience, we have introduced the technology of chlorine dioxide composite blockage relieving, carry out the action oriented research test.

Summary of the invention

1. the synthetic technology of stable chlorine dioxide

Utilize general chemical raw materials such as industrial goods sodium sulfite, EDTA, caustic soda, be prepared into nonpoisonous and tasteless stable chlorine dioxide pre-composition after loading in mixture technology, activate with acid solution during application, can form the stable chlorine dioxide solution of variable concentrations through special.

2. chlorine dioxide block releasing technique

Oxidative degradation remains in the high molecular polymer (as CMC, polyacrylamide, the non-terpolymer of CAN-1 negative and positive etc.) of near wellbore zone in work progresss such as drilling well, pressure break, water blockoff, dissection rapidly, the Cl atom that binding ability is strong can be fought for high volence metal ion with the relatively poor polymer of binding ability (crosslinking agent), make big molecule be cut into little molecule, its viscosity is declined to a great extent, flowability improves, be easy to from the stratum, discharge or push the depths, stratum dispersedly to, thereby remove obstruction the stratum with the injection current.

3. iron ion stabilization technique

Iron sulfide dirt reaction in chlorine dioxide and the stratum generates soluble ferric iron salt, prevents to generate the ferrous sulfide secondary precipitation, eliminates souring stage simultaneously and produces the hydrogen sulfide pernicious gas.

4. the technology of killing livestock

Chlorine dioxide is killed biological bacterium in the stratum by strong oxygenolysis, eliminates its thick secretions

5. the oil field mining site is used

The chlorine dioxide block releasing technique is used in the obstruction that forms under the following condition, cooperated proper construction technology, can reach effect preferably.

(1) injection water quality is poor, annotates sewage for a long time, because incrustation scale, bacterial reproduction and metabolite thereof stop up the under-injected well that the stratum descends water injection capacity;

(2) because of fracturing liquid rubber-breaking not thoroughly, instead arrange untimelyly, cause flood effectiveness poor, or the well of capacity of oilwell difference;

(3) because of profile control, transfer drive plug water construction cause in the well of less permeable layer contamination and plugging;

(4) form organic matter and inorganic matter well in drilling well, the completion practice process to formation damage.

The invention has the beneficial effects as follows that the chlorine dioxide COMBINATION PLUG REMOVAL TECHNOLOGY ABOUT is replenishing and development oil field tradition block releasing technique.Its technical maturity, the simple aspect of constructing do not need to increase new equipment, and the material ample supply and prompt delivery are satisfactory for result, meet the requirement of the low-cost volume increase in oil field actual conditions and oil field, augmented injection, have firmly got the welcome and the large-scale popularization of oil field development aspect and have used.

Claims

1. it is synthetic that increasing yield and injection technology, major product chlorine dioxide are used comparatively simple chemical industrial product raw material, and pre-composition is nonpoisonous and tasteless, can be applicable to the de-plugging of oil-water well in the mining site of oil field after the activation, increases oil production, water injection rate.

2. chlorine dioxide composite blockage relieving technology according to claim 1 is characterized in that: use the synthetic stable chlorine dioxide solution of general chemical raw material; This solution can be used to remove reservoir pollution; Iron ion in the acidization is stable; Strong oxygenolysis is killed biological bacterium in the stratum, eliminates its thick secretions; Optimize injection technology, remove the pollution of drilling well organic matter, the pollution of injection water bacteria, the broken glue of pressure break and profile control and water plugging and pollute.

3. chlorine dioxide composite blockage relieving technology according to claim 1 is characterized in that: comprehensively use acid solution and ClO 2 solution to remove reservoir pollution, finally reach the effect that increases oil production and water injection rate.