CN101016828A - Foam negative pressure mixed discharging plug removal method - Google Patents
Foam negative pressure mixed discharging plug removal method Download PDFInfo
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- CN101016828A CN101016828A CN 200710013467 CN200710013467A CN101016828A CN 101016828 A CN101016828 A CN 101016828A CN 200710013467 CN200710013467 CN 200710013467 CN 200710013467 A CN200710013467 A CN 200710013467A CN 101016828 A CN101016828 A CN 101016828A
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Abstract
本发明提供了一种泡沫负压混排储层解堵技术。其方法是通过泡沫吞吐、负压混排，利用泡沫的强携带固体微粒能力以及形成的较大井底压差，将近井地带的固体颗粒以及有机沉淀物等堵塞物排出地层，解除储层堵塞；同时利用携带有固体颗粒的高速返排流体，由内向外对炮眼的压实带进行冲洗，疏通射孔炮眼。本发明特别适用于解除新钻井泥浆漏失污染、疏通射孔炮眼以及解除生产过程中近井地带堵塞。The invention provides a foam negative pressure mixed drainage reservoir plugging removal technology. The method is to use the strong ability of foam to carry solid particles and the large bottom hole pressure difference to discharge the blockages such as solid particles and organic sediment in the near wellbore area through foam huff and puff and negative pressure mixed discharge, so as to relieve the blockage of the reservoir; At the same time, the high-speed flowback fluid carrying solid particles is used to flush the compaction zone of the blasthole from the inside to the outside, and dredge the perforation blasthole. The invention is especially suitable for removing the leakage pollution of new drilling mud, dredging the perforation blast hole and removing the blockage near the wellbore during the production process.
Description
Technical field:
The present invention relates to the reservoir blockages relieving technology in a kind of oil development process.
Background technology:
In the oil development process, because the influence of factors such as working fluid (as mud) leakage, near wellbore zone solid particle migration, clay swell, organic matter precipitation, inevitably can cause reservoir damage, cause reservoir obstruction, near wellbore permeability reduction, oil well output to descend.In order to recover oil well output, generally to carry out the de-plugging operation, block releasing technique commonly used mainly contains acidification to dispel block, organic solvent de-plugging and hydraulic oscillation de-plugging etc.Acidification to dispel block is mainly used in removes inorganic obstruction (as solid particle, fouling etc.), but is not suitable for acid-sensitive stratum; The organic solvent de-plugging is applicable to that mainly organogenous sediment stops up (as near the colloid the pit shaft, asphaltene precipitation); The hydraulic oscillation de-plugging mainly is to produce wave of oscillation flushing perforation borehole by high-pressure water jet to carry out de-plugging.Preceding two kinds method for removing blockage institute dosage is big, cost is higher, and applicable elements is single relatively; A kind of block releasing technique sphere of action in back is limited, can only remove the borehole top layer and stop up.
Technology contents:
The objective of the invention is to remove the near wellbore zone and stop up,, improve oil well output to recover in-place permeability.
The object of the present invention is achieved like this: by foam handle up, negative pressure mixed discharging, rely on the big bottom hole pressure difference that carries solia particle ability and formation by force of foam, obstructions such as the solid particle of near wellbore zone and organogenous sediment are discharged the stratum, simultaneously, utilization carries the high speed of solia particle and returns the current drainage body, compaction band to borehole washes from inside to outside, and mediation perforation borehole reaches and removes the purpose that reservoir stops up.Specifically realize as follows:
(a). inject a certain amount of nitrogen foam in the stratum, foam density is 0.6g/cm
3～0.8g/cm
3, injection rate is 0.3L/min～0.5L/min, the highest injection pressure can not surpass 20MPa.Injection rate is by formula Q= π r
2H determines that in the formula, Q is for injecting foam volume, (m
3); is a formation porosity, decimal; R is a plug removal radius, (m); H is a core intersection, (m).Plug removal radius is generally got 0.3 m～0.5m, and therefore, injection rate depends primarily on core intersection and degree of porosity.
(b). with 1～3 circulation of low-density nitrogen foam circulation well cleanup, the density of foam is 0.2g/cm
3～0.5g/cm
3, injection rate is 0.4L/min～0.6L/min, reduces bottom pressure, in the control bottom hole pressure difference 10Mpa, relies on the foam and the gas expansion of the row of returning at a high speed, and the solid particle and the organogenous sediment of near wellbore zone carried out the stratum.Simultaneously, utilize the high speed carry solia particle to return the current drainage body, the compaction band of perforation borehole is washed from inside to outside, mediation perforation borehole reaches the effect of jet de-plugging.
Aerated fluid is a kind of compressible gas-liquid mixture, have characteristics such as density is low, easy to adjust, apparent viscosity is high, the row's of helping performance is good, have the very strong solia particle ability of carrying when in the stratum, flowing, can control bottom hole pressure difference very easily, reach the row's of helping effect preferably.
The specific embodiment:
Describe the present invention in detail below in conjunction with embodiment.
Embodiment 1: behind drilling completion, because the reservoir pollution that causes of lose returns and, can adopt the foam negative pressure mixed discharging plug removal technology to remove reservoir pollution, dredge the perforation borehole from inside to outside because the borehole compaction band that perforation causes has considerable influence to oil well productivity.Oil well with well depth 1000m is an example, and concrete scheme is: at first inject a certain amount of nitrogen foam in the stratum, foam density is 0.7g/cm
3, injection rate is according to formula Q= π r
2H determines that get plug removal radius r=0.4m, injection rate is 0.3L/min～0.5L/min, and the highest injection pressure can not surpass 15MPa; Be 0.2g/cm with density then
32 circulations of nitrogen foam circulation well cleanup, injection rate is 0.4L/min～0.5L/min, reduces bottom pressure, increases the pressure reduction between stratum and shaft bottom, but the control bottom hole pressure difference is not more than 10MPa, lure that the foam that has injected returns discharge at a high speed into, when foam returns row leakage is advanced the mud and the parts of fine flour sand on stratum and take out of together, meanwhile, the high speed that carries solid particle is returned the current drainage body, compaction band to borehole washes from inside to outside, has dredged the perforation borehole, thereby removes formation blockage.
Embodiment 2: the relatively poor oil reservoir of sorting, loose sand heavy crude reservoir particularly, after producing a period of time, the near wellbore zone is stopped up serious, obstruction mainly is solid particle and colloid, bitum organogenous sediment, can adopt foam negative pressure mixed discharging plug removal method provided by the present invention to remove formation blockage.Oil well with well depth 1000m is an example, and concrete scheme is: at first inject a certain amount of nitrogen foam to the stratum, foam density is generally 0.7g/cm
3, injection rate is 0.3L/min～0.5L/min, and the highest injection can not surpass 12MPa, and injection rate is according to formula Q= π r
2H determines, gets plug removal radius r=0.3m; Be 0.3g/cm with density then
31.5 circulations of low-density nitrogen foam circulation well cleanup, injection rate is 0.4L/min～0.5L/min, reduce bottom pressure, increase the pressure reduction between stratum and shaft bottom, but the control bottom hole pressure difference is not more than 8MPa, luring that the foam that has injected returns at a high speed into ejects, and will stop up the fine silt on stratum and discharge together with organogenous sediment when foam returns row, thereby remove formation blockage.
The present invention by foam handle up, negative pressure mixed discharging, utilize the big bottom hole pressure difference that carries solia particle ability and formation by force of foam, obstructions such as the solid particle of near wellbore zone and organogenous sediment are discharged the stratum, remove reservoir to stop up; Utilize the high speed that carries solid particle to return the current drainage body simultaneously, the compaction band to borehole washes from inside to outside, mediation perforation borehole, and this is that other de-plugging process institute is inaccessiable.
Claims (2)
1. foam negative pressure mixed discharging plug removal technology, it is characterized in that by foam handle up, negative pressure mixed discharging, the solid particle and the organogenous sediment obstruction of near wellbore zone are discharged the stratum, remove reservoir and stop up, specifically implement as follows:
(a). inject a certain amount of nitrogen foam in the stratum, foam density is 0.6g/cm
3～0.8g/cm
3, injection rate is 0.3L/min～0.5L/min, injection rate is by formula Q= π r
2H determines that in the formula, Q is for injecting foam volume, and is a formation porosity, and r is a plug removal radius, and h is a core intersection;
(b). with density is 0.2g/cm
3～0.5g/cm
31～3 circulation of low-density nitrogen foam circulation well cleanup, injection rate is 0.4L/min～0.6L/min, reduce bottom pressure, in the control bottom hole pressure difference 10Mpa, rely on the foam and the gas expansion of the row of returning at a high speed, the solid particle and the organogenous sediment of near wellbore zone carried out the stratum; Simultaneously, utilize the high speed carry solia particle to return the current drainage body, the compaction band of perforation borehole is washed from inside to outside, mediation perforation borehole reaches the effect of jet de-plugging.
2. foam negative pressure mixed discharging plug removal method according to claim 1 is characterized in that the plug removal radius in the injection rate design formulas is got 0.3m～0.5m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710013467XA CN100537999C (en) | 2007-02-02 | 2007-02-02 | Foam Negative Pressure Mixed Discharge and Blockage Removal Method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710013467XA CN100537999C (en) | 2007-02-02 | 2007-02-02 | Foam Negative Pressure Mixed Discharge and Blockage Removal Method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101016828A true CN101016828A (en) | 2007-08-15 |
| CN100537999C CN100537999C (en) | 2009-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200710013467XA Expired - Fee Related CN100537999C (en) | 2007-02-02 | 2007-02-02 | Foam Negative Pressure Mixed Discharge and Blockage Removal Method |
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| CN (1) | CN100537999C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718184B (en) * | 2009-12-15 | 2013-10-30 | 中国石油大学(华东) | Foamed acid washing technological method for horizontal well |
| CN103696720A (en) * | 2013-12-26 | 2014-04-02 | 中国海洋石油总公司 | Composite unblocking method |
| CN103790539A (en) * | 2013-06-13 | 2014-05-14 | 李世銮 | Process of removing blocking by positive hydraulic impact |
| CN106481322A (en) * | 2015-08-27 | 2017-03-08 | 中国石油大学(北京) | A kind of method that expansion expands borehole aperture in included gas |
| CN109083621A (en) * | 2018-07-28 | 2018-12-25 | 中国石油天然气股份有限公司 | A composite plugging removal method for horizontal well coiled tubing |
| CN113898303A (en) * | 2020-07-06 | 2022-01-07 | 中国石油化工股份有限公司 | Oil well acidification flowback negative pressure hollowing process method |
-
2007
- 2007-02-02 CN CNB200710013467XA patent/CN100537999C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718184B (en) * | 2009-12-15 | 2013-10-30 | 中国石油大学(华东) | Foamed acid washing technological method for horizontal well |
| CN103790539A (en) * | 2013-06-13 | 2014-05-14 | 李世銮 | Process of removing blocking by positive hydraulic impact |
| CN103696720A (en) * | 2013-12-26 | 2014-04-02 | 中国海洋石油总公司 | Composite unblocking method |
| CN103696720B (en) * | 2013-12-26 | 2016-05-18 | 中国海洋石油总公司 | A kind of composite blockage relieving method |
| CN106481322A (en) * | 2015-08-27 | 2017-03-08 | 中国石油大学(北京) | A kind of method that expansion expands borehole aperture in included gas |
| CN109083621A (en) * | 2018-07-28 | 2018-12-25 | 中国石油天然气股份有限公司 | A composite plugging removal method for horizontal well coiled tubing |
| CN113898303A (en) * | 2020-07-06 | 2022-01-07 | 中国石油化工股份有限公司 | Oil well acidification flowback negative pressure hollowing process method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100537999C (en) | 2009-09-09 |
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Granted publication date: 20090909 Termination date: 20120202 |