CN1480628A - Method for releasing oil field from blockage caused by high molecular polymer - Google Patents
Method for releasing oil field from blockage caused by high molecular polymer Download PDFInfo
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- CN1480628A CN1480628A CNA021295719A CN02129571A CN1480628A CN 1480628 A CN1480628 A CN 1480628A CN A021295719 A CNA021295719 A CN A021295719A CN 02129571 A CN02129571 A CN 02129571A CN 1480628 A CN1480628 A CN 1480628A
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Abstract
A method for removing the plug of high-molecular polymer in oil field includes injecting high-temp aqueous solution of ADS as hydrolyzing catalyst for promoting the hydrolyzing and thermodecomposing reaction of high-molecular polymer, adding the aqueous solution of SDT as strong oxidant for oxidizing degradation, reaction to lower the molecular weight of said polymer, using BSN as pilotting agent for forcing the injected liquid to come in low-osmosis region, and injection nano molecular filming agent HB for improving the lubrication of stratum.
Description
Technical field
The present invention relates to a kind of method that the oil field high molecular polymer stops up of removing.
Background technology
Carry out in the oil field at present generally using various high molecular polymers in the chemical displacement of reservoir oil process, as partially hydrolyzed polyacrylamide (PHPA) (HPAM), xanthans (XC), natural polymer and modified product thereof.But they are in the shaft bottom, particularly in the oil reservoir near wellbore zone since the rock stratum to the absorption of high molecular polymer, capture effect such as bridges formation, the part infusion is trapped in the hole of rock stratum, formation obstruction in various degree.This obstruction produces totally unfavorable influence to the chemical displacement of reservoir oil, can cause injection pressure to increase substantially, and injects liquid measure and reduces significantly, influences crude output.
The object of the present invention is to provide a kind of method that the oil field high molecular polymer stops up of removing, the high molecular polymer that is trapped in shaft bottom and near wellbore zone is degraded fast, recover in-place permeability, reach the injection well augmented injection, improve the effect of oil recovery factor.
Summary of the invention
The objective of the invention is to realize: a kind of method of removing oil field high molecular polymer obstruction by following technical scheme, it is characterized in that: comprise that the de-plugging steps A is to the oil reservoir injection hydrolyst ADS of de-plugging 0.3%-1.2% sodium hydrate aqueous solution, temperature is more than 90 ℃ and/or step B injects the chloride paracyanogen aqueous acid of strong oxidizer SDT 0.1%-5%, temperature is a normal temperature, and being used the diversion agent BSN-CMS and/or the step C injection nano molecular film HB0.1%-0.5% modification alkylsiloxane APEO aqueous solution, temperature is a normal temperature; Step D shut-in well at least 48 hours.
In above-mentioned:
The solution injection rate is relevant with core intersection, degree of porosity, the treatment radius of injection well among described steps A, B, the C, calculates injection rate by following formula: V=π r
2In the h φ formula: V-injects liquid measure volume m
3, r-Design Treatment radius m, h-effective pay thickiness m, φ-oil reservoir degree of porosity percentage %.Usually for each mouthful injection well, its h, φ are definite value, and r gets 5-25m approximately;
Described de-plugging step C is carrying out after the steps A or before steps A;
1 kilogram/every rice bran oil layer of described diversion agent BSN-CMS use amount;
Described hydrolyst ADS substitutes with potassium hydroxide;
Described diversion agent BSN substitutes with sulfamic acid.
Among the present invention, employed various raw materials can buy in chemical industry shop or factory, and grade is industrial 1-2 level.
Technological progress of the present invention is: technology is simple, raw material is easily purchased, cost is low, use the hydrolyst ADS solution of high temperature, both can realize the high molecular polymer hydrolysis, can impel the high molecular polymer thermal degradation again, reduce the processing cost expense, enlarged process range; Use diversion agent BSN shutoff high-capacity channel at short notice, force the injection blockages relieving fluid to enter hypotonic zone,, improve plugging removal effect to enlarge the sweep area that injects liquid; Use nano molecular film HB to stop the absorption of polymer in rock layer surface in the rock layer surface characteristic of arranging exhibits, the protection plugging removal effect prolongs the measure period of validity.
Description of drawings
Fig. 1 is a process flow diagram of the present invention;
Fig. 2 is a de-plugging schematic diagram of the present invention.
The specific embodiment
Below in conjunction with embodiment in detail the present invention is described in detail.
The polymer liquid measure of injecting when a bite injection well reduces gradually, both has been to improve injection pressure, also is difficult to finish the design injection rate, generally be reduced to about 50%, be called the serious intact promptly serious obstruction of injection allocation that do not become, carry out de-plugging this moment, need carry out A, B, three steps of C usually.
Embodiment 1: handle the serious injection well that stops up of a bite, its effective pay thickiness h10 rice, 5 meters of Design Treatment radius r, oil reservoir degree of porosity percentage φ 20%.Its de-plugging step: the first step is gone into 157 cubic metres of hydrolysis catalyst A DS 0.3%-1.2% sodium hydrate aqueous solutions with infusion in the oil reservoir of separating obstruction, temperature is more than 90 ℃.After injecting high molecular polymer in the oil reservoir; usually can at high temperature thermal degradation reaction can take place, for example, hydrolyzed polyacrylamide; beginning to degrade more than 85 ℃; have tangible degraded at 90 ℃ to 110 ℃, the solution temperature that injects among the present invention can be obtained certain plugging removal effect more than 90 ℃; add the existence of catalyzer NaOH; the HYDROLYSIS OF POLYACRYLAMIDE AND ITS COPOLYMERS degree is further improved, that is the increase of electronegative chain link, as-COOH ,-COON etc.In long-term the injecting process, rock layer surface is electronegative, and based on the principle that like electricity is repelled each other, electronegative polyacrylamide is difficult for being adsorbed on rock layer surface, thereby reaches the effect that reduces adsorbance.But this step plugging removal effect is limited, can not realize whole de-pluggings of polyacrylamide, need carry out for second step and inject 157 cubic metres of the chloride paracyanogen aqueous acids of strong oxidizer SDT 0.1%-5%, and solution temperature is a normal temperature.Oxidative degradation can take place in high sub-polymer in the presence of oxygen, the oxygen that is provided by strong oxidizer SDT and the polyacrylamide of delay react, it is degraded significantly, and big molecule long-chain becomes short chain, and viscosity reduces, handling capacity in the hole of rock stratum strengthens, and reaches the effect of de-plugging.Inject the different permeable areas that liquid fully reaches oil reservoir in order to make simultaneously, 10 kilograms of diversion agent BSN-CMSs have been added in the present invention, it can enter the duct of high permeability zones, and form obstruction, and force and inject the micropore that liquid enters hypotonic district, enlarge the de-plugging scope, after finishing the de-plugging process, it is dissolved to form the diversion agent BSN that stops up, defunctionalization, and the permeability of near wellbore zone is restored like this.Be the protection plugging removal effect, carried out for the 3rd step and inject 157 cubic metres of the nano molecular film HB 0.1%-0.5% modification alkylsiloxane APEO aqueous solution that solution temperature is a normal temperature.Because of on the basis of first two steps, near wellbore zone high polymer clogging is disengaged, and rock surface is exposed, and as if untimely it is handled, and then can also adsorb the high molecular polymer of follow-up injection.The nano molecular film HB that injects among the present invention; it is a kind of organic polymer of small-molecular weight; can enter lattice fracture depths, rock stratum; based on strong electrostatic attraction and covalence key effect; the firm rock layer surface that is adsorbed on, and align, characteristic become; make rock layer surface form the negativity surface, and protect the complete of original negativity surface.When the high molecular polymer that shows negativity passes through from the hole of rock stratum; owing to the effect that repels each other with electricity; force the high molecular polymer that injects liquid must not be near hole wall; thereby avoid or reduced the absorption of polymer on hole wall; thereby reach the purpose of protection plugging removal effect; in the de-plugging process, shunt in a well at least 48 hours.
When a bite injection well will keep the poly-amount of normal notes and need improve constantly injection pressure, when the notes pressure reaches the authorized pressure value, then can not pressurize again, this moment is approaching or reach under-voltage, still intactly do not become the injection allocation amount, generally be reduced to about 20-30%, then can be judged as obvious obstruction, at this moment carry out de-plugging, can select steps A, C or step B, C.
Embodiment 2: handle the injection well that a bite is obviously stopped up, its effective pay thickiness h12 rice, 8 meters of Design Treatment radius r, oil reservoir degree of porosity percentage φ 10%.Its de-plugging step: the first step is gone into 240 cubic metres of hydrolysis catalyst A DS 0.3%-1.2% potassium hydroxide aqueous solutions with infusion in the oil reservoir of separating obstruction, temperature is more than 90 ℃.Carried out for second step then and inject 250 cubic metres of the nano molecular film HB 0.1%-0.5% modification alkylsiloxane APEO aqueous solution, solution temperature is a normal temperature.In the de-plugging process, shunt in a well 48 hours.
Embodiment 3: handle the injection well that a bite is obviously stopped up, its effective pay thickiness h9 rice, 6 meters of Design Treatment radius r, oil reservoir degree of porosity percentage φ 25%.Its de-plugging step: the first step is gone into 254 cubic metres of the chloride paracyanogen aqueous acids of strong oxidizer SDT 0.1%-5% with infusion in the oil reservoir of separating obstruction, solution temperature is a normal temperature, and adds 9 kilograms of diversion agent BSN-sulfamic acids.Second step was injected 254 cubic metres of the nano molecular film HB 0.1%-0.5% modification alkylsiloxane APEO aqueous solution, and solution temperature is a normal temperature.In the de-plugging process, shunt in a well 48 hours.
In the present invention, its de-plugging step C can carry out before steps A, that is to say before injection well utilizes the displacement of reservoir oil of injection high molecular polymer first and carry out, make the high molecular polymer of annotating in the poly-liquid keep clear of hole wall, avoid or reduced the absorption of polymer on hole wall, thereby alleviated the obstruction process of injection well.
Claims (6)
1. remove the method that the oil field high molecular polymer stops up for one kind, it is characterized in that: comprise that the de-plugging steps A is to the oil reservoir injection hydrolyst ADS of de-plugging 0.3%-1.2% sodium hydrate aqueous solution, temperature is more than 90 ℃ and/or step B injects the chloride paracyanogen aqueous acid of strong oxidizer SDT 0.1%-5%, temperature is a normal temperature, and being used the diversion agent BSN-CMS and/or the step C injection nano molecular film HB 0.1%-0.5% modification alkylsiloxane APEO aqueous solution, temperature is a normal temperature; Step D shut-in well at least 48 hours.
2. according to the method for the described releasing of claim 1 oil field high molecular polymer obstruction, it is characterized in that: the solution injection rate is calculated by following formula and is determined among described steps A, B, the C: V=π r
2In the h φ formula: V-injects liquid measure volume m
3, r-Design Treatment radius m, h-effective pay thickiness m, φ-oil reservoir degree of porosity percentage %.
3. according to the method for the described releasing of claim 1 oil field high molecular polymer obstruction, it is characterized in that: described de-plugging step C is carrying out after the steps A or before steps A.
4. according to the method for claim 1 or 2 described releasing oil field high molecular polymers obstructions, it is characterized in that: 1 kilogram/every rice bran oil layer of described diversion agent BSN-CMS use amount.
5. according to the method for the described releasing of claim 1 oil field high molecular polymer obstruction, it is characterized in that: described hydrolyst ADS substitutes with potassium hydroxide.
6. state according to claim 1 or 4 and remove the method that the oil field high molecular polymer stops up, it is characterized in that: described diversion agent BSN substitutes with sulfamic acid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021295719A CN1480628A (en) | 2002-09-05 | 2002-09-05 | Method for releasing oil field from blockage caused by high molecular polymer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021295719A CN1480628A (en) | 2002-09-05 | 2002-09-05 | Method for releasing oil field from blockage caused by high molecular polymer |
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| CN1480628A true CN1480628A (en) | 2004-03-10 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101196109B (en) * | 2007-12-27 | 2011-06-08 | 大庆石油学院 | Three-segment type block releasing technique for oil layer |
| CN105793520A (en) * | 2013-10-17 | 2016-07-20 | 西格纳化学有限责任公司 | Alkali metal silicides for high temperature wettability improvement in carbonate reservoirs |
| CN109504359A (en) * | 2019-01-17 | 2019-03-22 | 山东滨州昱诚化工科技有限公司 | A kind of oil extraction in oil field high polymer polyacrylamide degradation de-plugging agent and preparation method |
| CN112196503A (en) * | 2020-10-16 | 2021-01-08 | 中海石油(中国)有限公司 | Method for improving injectability of oil displacement polymer |
| CN112195018A (en) * | 2020-11-04 | 2021-01-08 | 许吉干 | Non-oxidation environment-friendly efficient blockage removing depolymerization liquid |
-
2002
- 2002-09-05 CN CNA021295719A patent/CN1480628A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101196109B (en) * | 2007-12-27 | 2011-06-08 | 大庆石油学院 | Three-segment type block releasing technique for oil layer |
| CN105793520A (en) * | 2013-10-17 | 2016-07-20 | 西格纳化学有限责任公司 | Alkali metal silicides for high temperature wettability improvement in carbonate reservoirs |
| US10240443B2 (en) | 2013-10-17 | 2019-03-26 | Signa Chemistry, Inc. | Alkali metal silicides for high temperature wettability improvement in carbonate reservoirs |
| CN109504359A (en) * | 2019-01-17 | 2019-03-22 | 山东滨州昱诚化工科技有限公司 | A kind of oil extraction in oil field high polymer polyacrylamide degradation de-plugging agent and preparation method |
| CN109504359B (en) * | 2019-01-17 | 2022-06-28 | 山东滨州昱诚化工科技有限公司 | High-molecular polyacrylamide degradation blocking remover for oil extraction in oil field and preparation method thereof |
| CN112196503A (en) * | 2020-10-16 | 2021-01-08 | 中海石油(中国)有限公司 | Method for improving injectability of oil displacement polymer |
| CN112195018A (en) * | 2020-11-04 | 2021-01-08 | 许吉干 | Non-oxidation environment-friendly efficient blockage removing depolymerization liquid |
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