CN100387678C - Oil-layer blasthole plugging agent at low temperature - Google Patents
Oil-layer blasthole plugging agent at low temperature Download PDFInfo
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- CN100387678C CN100387678C CNB2006101004414A CN200610100441A CN100387678C CN 100387678 C CN100387678 C CN 100387678C CN B2006101004414 A CNB2006101004414 A CN B2006101004414A CN 200610100441 A CN200610100441 A CN 200610100441A CN 100387678 C CN100387678 C CN 100387678C
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Abstract
A low-temperature oil-layer hole sealing agent consists of 15-19% ultrahigh molecular polypropylene fine fiber, 16-20% superfine expansion cement, 40-50% tricalcium silicate, 12-16% active microcrystalline reinforcing agent and 3-5% sulfonated Danin. It is safe and convenient, has better adaptive and comprehensive performances.
Description
Technical field:
The present invention relates to the oil field borehole plugging agent, belong to oil-layer blasthole plugging agent at low temperature.
Background technology:
In the oilfield development process, most oil wells are the oil comminglings more than two layers.After the oil field enters high water-cut stage, inject water and advance by leaps and bounds, make most permeable zone become high pressure zone, normal production fluid, the produce oil of low permeability layer in the influence along most permeable zone; Simultaneously, because long-term injection exploitation, the remaining oil saturation of most permeable zone reduces, and utility value reduces under present technical qualification, therefore, some most permeable zones need be shut; On stream, by scheme the series of strata of exploitation are adjusted and also needed some oil reservoir is carried out shutoff.
At present, the method for oil reservoir being carried out shutoff mainly contains two kinds, and a kind of is to adopt machinery card envelope, this method has a strong impact on the enforcement of test and various well stimulations owing to leave tubing string in the pit shaft, and validity period is shorter, for injection well, generally can't satisfy needs of annotating the poly-cycle; Another kind is to utilize the chemical plugging agent to carry out shutoff, and the subject matter of these class methods is that weldbonding tubing string accident takes place easily, and risk is bigger, can't shutoff to the well section of the above length of 8m.Some method also can produce possible permanent damage to oil reservoir, can't utilize again again, and construction period is generally long, cost is higher, is difficult to large-scale application.Utilizing the chemical plugging agent to carry out another problem that shutoff usually runs into is exactly when miss on the stratum, need carry out pre-treatment to the leakage stratum, and this often needs to expend fund and time.For temperature 50-90 ℃ oil reservoir, developed the borehole plugging agent that is suitable for, but be lower than 50 ℃ oil reservoir for temperature, still there is not suitable borehole plugging agent.
Summary of the invention:
The purpose of this invention is to provide a kind of oil-layer blasthole plugging agent at low temperature, it is big that this plugging agent solves conventional plugging agent wastage, solidifies rear interface and shrink, to the problem of ground adaptability and working security difference.
The present invention is achieved in that counts by weight percentage, this plugging agent comprises the polyacrylic microfibre of the supra polymer of 15%-19%, the ultra-fine expanded cement of 16%-20%, the tricalcium silicate of 40%-50%, the active crystallite toughener of 12-16%, 3%-5% sulfonation tannin.
The polyacrylic microfibre of above-mentioned said supra polymer is a molecular weight 2300 * 10
4-2800 * 10
4Polyacrylic microfibre; The composition of active crystallite toughener is the hardening accelerator that adds 7%-9% in the high strength cement, high strength cement wherein is silicate or the sulfate cement of the 800-1000# of market sale, hardening accelerator can be solubility inorganic calcium salt or organic calcium salt, as calcium chloride, calcium sulfate, calcium acetate, citrate of lime etc.; The sulfonation tannin is that the sulfonation degree of selling on the market is 50-80%.This plugging agent is applicable to the oil reservoir of 30 ℃ of-60 ℃ of temperature.
When implementing at the scene, base area layer depth and well temperature are 1 with water and plugging agent: 1.2-1 by weight: 1.5 mixed, being mixed with density is 1.2-1.65g/cm
3About slurry, inject with pump truck extruding and to desire the reservoir plugging borehole, then plugging agent is pressurizeed repeatedly, make it to form plugged zone, after wait to congeal into and be high-intensity cured body, thereby realize shutoff to oil-layer blasthole.
The polyacrylic microfibre of above-mentioned said supra polymer is the support structure agent, its effect is to form the fibrous reticulum shelf structure fast, play the effect of filter screen, when stifled slurry that plugging agent is made into enter desire plugged zone after, under pressure, spatial grid structure can be caught the solid particulate components in the plugging agent, control the loss of plugging agent effective ingredient, extrude excessive moisture simultaneously, through pressurization squeeze note repeatedly, make the blocking layer structure constantly by closely knit, the moisture in the blocking layer is less and less, the pressure of fluid breakthrough blocking layer is more and more high, thereby improves the presence of plugging agent; Ultra-fine expanded cement is weighting agent, and the major function of expanded polystyrene veneer reinforcing filler is to strengthen the interface agglutination degree of plugging agent cured body, can control the filter loss of slurry at hydrated cementitious in early days, and keeps stable volumetric expansion in the different aquation stages of grout; Tricalcium silicate is a solidifying agent, and its major function is to make plugging agent form high-intensity cured body, excites the aquation curing reaction of other components of plugging agent by the solidifying agent hydration reaction, and the plugged zone that plugging agent is formed has higher body and interface cementing strength; The major function of active crystallite toughener is to make cured body hydrated product compact structure, strengthens cured body body intensity and interface cementing strength; The sulfonation tannin is the workability conditioning agent, is mainly used in initial set, the final setting time of regulating plugging agent.
Experimental results show that: the present invention is on the basis of cementation interface Study on Microstructure, develops according to the enhanced mechanism of interface cementing strength and method, has five outstanding features: 1, be suitable for 30 ℃ of-60 ℃ of temperature oil reservoir shutoff; 2, enter behind the shutoff destination layer and can it effectively be resided in the weak zone, can effectively prevent leakage, significantly reduced the plugging agent consumption, improve the construction success ratio by forming firm spatial grid structure fast; 3, by improving the cementation interface microtexture, optimize the chemical composition of hydrated product, plugging agent can form anti-scurry intensity height, erosion resistant plugged zone at the target plugged zone, improves the construction validity period greatly; 4, the new chemical plugging agent in pit shaft can guarantee good flowability in the regular hour, can be not dull and solidify, and stifled slurry just can form structure and intensity fast in case enter the shutoff destination layer; 5, since use after this plugging agent shutoff pollution-free to oil reservoir, so can be if desired the time by the perforation mode to oil layer unblocking, oil reservoir can be utilized again.
Embodiment:
Do detailed description below in conjunction with embodiment, but not as a limitation of the invention.
Oil-layer blasthole plugging agent at low temperature of the present invention composed as follows: the polyacrylic microfibre of (1) supra polymer, its molecular weight is 2300 * 10
4-2800 * 10
4, dosage is 15-19%; (2) ultra-fine expanded cement, dosage are 16-20%; (3) tricalcium silicate, dosage are 40-50%; (4) active crystallite toughener, dosage is 12-16%, the composition of active crystallite toughener is the hardening accelerator that adds 7-9% in the high strength cement, high strength cement wherein is silicate or the sulfate cement of the 800-1000# of market sale, hardening accelerator can be solubility inorganic calcium salt or organic calcium salt, as calcium chloride, calcium sulfate, calcium acetate, citrate of lime etc.; (5) sulfonation tannin, dosage are 3-5%, and its sulfonation degree is at 50-80%, and market is on sale.The granularity of above all material all is controlled between the 180-320 order.The ratio of above component all is weight percentage.
Base area layer depth and well temperature during field conduct, by 1: 1.2-1: 1.5 water cement ratio is mixed with density 1.2-1.65g/cm
3About slurry, go into to desire the reservoir plugging borehole with the pump truck squeeze note.Then blocking agent is pressurizeed repeatedly, make it to form blocking layer, after wait that to congeal into be that high-intensity cured body is realized the shutoff to oil-layer blasthole.
Embodiment 1: northern 1-fourth 4-P62 well is a water injection well.This well plugged zone I1 of Portugal, 1, plugged well section 1047.8-1051.4m penetrates out thickness 3.6m, 42 ℃ of reservoir temperatures.The product of used oil-layer blasthole plugging agent at low temperature for being mixed with by following weight percent: molecular weight is 2300 * 10
4Polyacrylic microfibre 17%; Ultra-fine expanded cement 18%; Tricalcium silicate 45%; The silicate cement 13.8% of 800#; Industrial sulphuric acid calcium 1.2%; The sulfonation tannin 5% of sulfonation degree 75%.After above all material mixes, grind and make granularity all be controlled at 200 mesh sieve eyes all to pass through.This plugging agent is tested down in 45 ℃ indoor, and its presetting period is about 3.5h, and setting time is about 5.5h fully.Preparation water 3.0m during site operation
3, add borehole plugging agent 4.2t, stir, the plugging agent density of suspending liquid that is mixed with is 1.55g/cm
3Inject the down-hole plugged zone with high-pressure pump.When injecting 4.5m
3During plugging agent, pressure rises to 3.5MPa.Continue water for squeezing, and squeeze note repeatedly, rise to 15MPa until pressure.When plugging agent is prepared, count, when arriving presetting period 3.5h, the plugging agent that does not enter borehole and stratum in the pit shaft is recoiled out with the method for anti-flushing well.Continue then the plugged zone pressurization, closing well is waited and is coagulated 24h.15MPa does not have leakage to the plugged zone pressure testing, and plugging effect is good.
Embodiment 2: Bei1-321-P37Jing is a producing well, this well plugged zone Sa II14-16, and plugged well section 991.9-999.0m penetrates out thickness 7.1m, 43 ℃ of reservoir temperatures.The product of used oil-layer blasthole plugging agent at low temperature for being mixed with by following weight percent: molecular weight is 2500 * 10
4Polyacrylic microfibre 15%; Ultra-fine expanded cement 16%; Tricalcium silicate 49%; The silicate cement 14.5% of 800#; Industrial calcium chloride 1.5%; The sulfonation tannin 4% of commercial sulfonate degree 75%.After above all material mixes, grind and make granularity all be controlled at 200 mesh sieve eyes all to pass through.This plugging agent is tested down in 45 ℃ indoor, and its presetting period is about 3h, and setting time is about 5h fully.Preparation water 3.5m during site operation
3, add borehole plugging agent 4.9t, stir, the plugging agent density of suspending liquid that is mixed with is 1.50g/cm
3Inject the down-hole plugged zone with high-pressure pump.When injecting 2.9m
3Behind the plugging agent, continue water for squeezing, and squeeze note repeatedly, when injecting 2.7m
3During water, pressure rises to 15MPa.When plugging agent is prepared, count, when arriving presetting period 3h, the plugging agent that does not enter borehole and stratum in the pit shaft is recoiled out with the method for anti-flushing well.Continue then the plugged zone pressurization, closing well is waited and is coagulated 24h.I0MPa does not have leakage to the plugged zone pressure testing, and plugging effect is good.
Embodiment 3: northern 1-fourth 5-P141 well is a water injection well.This well plugged zone I2 of Portugal, plugged well section 1023.5-1028.6m penetrates out thickness 5.1m, 42 ℃ of reservoir temperatures.The product of used oil-layer blasthole plugging agent at low temperature for being mixed with by following weight percent: molecular weight is 2400 * 10
4Polyacrylic microfibre 17%; Ultra-fine expanded cement 18%; Tricalcium silicate 45%; The silicate cement 13.8% of 800#; Industrial sulphuric acid calcium 1.2%; The sulfonation tannin 5% of sulfonation degree 75%.After above all material mixes, grind and make granularity all be controlled at 200 mesh sieve eyes all to pass through, its presetting period is about 3.5h to this plugging agent in 45 ℃ of experiments down indoor, and setting time is about 5.5h fully.Preparation water 4.0m during site operation
3, add borehole plugging agent 5.6t, stir, the plugging agent density of suspending liquid that is mixed with is 1.53g/cm
3Inject the down-hole plugged zone with high-pressure pump.When injecting 4.5m
3During plugging agent, pressure rises to 5MPa.Continue water for squeezing, and squeeze note repeatedly, when injecting 2.1m
3During water, pressure rises to 15MPa.When plugging agent is prepared, count, when arriving presetting period 3.5h, the plugging agent that does not enter borehole and stratum in the pit shaft is recoiled out with the method for anti-flushing well.Continue then the plugged zone pressurization, closing well is waited and is coagulated 24h.12MPa does not have leakage to the plugged zone pressure testing, and plugging effect is good.
Embodiment 4: Bei1-7-P143Jing is a producing well.This well plugged zone I2 of Portugal, plugged well section 1065.4-1074.0m penetrates out thickness 8.6m, 45 ℃ of reservoir temperatures.The product of used oil-layer blasthole plugging agent at low temperature for being mixed with by following weight percent: molecular weight is 2800 * 10
4Polyacrylic microfibre 19%; Ultra-fine expanded cement 20%; Tricalcium silicate 40%; The silicate cement 13.8% of 800#; Industrial sulphuric acid calcium 1.2%; The sulfonation tannin 6% of commercial sulfonate degree 75%.After above all material mixes, grind and make granularity all be controlled at 200 mesh sieve eyes all to pass through.This plugging agent is tested down in 45 ℃ indoor, and its presetting period is about 4h, and setting time is about 6h fully.Site operation preparation water 5.0m
3, add borehole plugging agent 6.75t, stir, the plugging agent density of suspending liquid that is mixed with is 1.43g/cm
3Inject the down-hole plugged zone with high-pressure pump.When injecting 5.2m
3During plugging agent, pressure rises to 8MPa.Continue water for squeezing, and squeeze note repeatedly, when injecting 0.5m
3During water, pressure rises to 15MPa.When plugging agent is prepared, count, when arriving presetting period 4h, the plugging agent that does not enter borehole and stratum in the pit shaft is recoiled out with the method for anti-flushing well.Continue then the plugged zone pressurization, closing well is waited and is coagulated 24h.12MPa does not have leakage to the plugged zone pressure testing, and plugging effect is good.
Embodiment 5: Bei1-5-P68Jing is a water injection well.This well plugged zone I1-2 of Portugal, plugged well section 1070.6-1075.7m penetrates out thickness 5.1m, 42 ℃ of reservoir temperatures.The product of used oil-layer blasthole plugging agent at low temperature for being mixed with by following weight percent: molecular weight is 2700 * 10
4Polyacrylic microfibre 17%; Ultra-fine expanded cement 18%; Tricalcium silicate 45%; The silicate cement 13.8% of 800#; Industrial sulphuric acid calcium 1.2%; The sulfonation tannin 5% of sulfonation degree 75%.After above all material mixes, grind and make granularity all be controlled at 200 mesh sieve eyes all to pass through.This plugging agent is tested down in 45 ℃ indoor, and its presetting period is about 3.5h, and setting time is about 5.5h fully.Site operation preparation water 4.5m
3, add borehole plugging agent 6.3t, stir, the plugging agent density of suspending liquid that is mixed with is 1.55g/cm
3Inject the down-hole plugged zone with high-pressure pump.When injecting 4.5m
3During plugging agent, pressure rises to 5MPa.Continue water for squeezing, and squeeze note repeatedly, when injecting 1.55m
3During water, pressure rises to 18MPa.When plugging agent is prepared, count, when arriving presetting period 3.5h, the plugging agent that does not enter borehole and stratum in the pit shaft is recoiled out with the method for anti-flushing well.Continue then the plugged zone pressurization, closing well is waited and is coagulated 24h.15MPa does not have leakage to the plugged zone pressure testing, and plugging effect is good.
Claims (3)
1. oil-layer blasthole plugging agent at low temperature, it is characterized in that: count by weight percentage, this plugging agent comprises the polyacrylic microfibre of the supra polymer of 15%-19%, the ultra-fine expanded cement of 16%-20%, the tricalcium silicate of 40%-50%, the active crystallite toughener of 12%-16%, 3%-5% sulfonation tannin, the polyacrylic molecular weight 2300 * 10 of described supra polymer
4-2800 * 10
4, described active crystallite toughener is the hardening accelerator that adds 7%-9% in the high strength cement, hardening accelerator is calcium chloride, calcium sulfate, calcium acetate or citrate of lime.
2. a kind of oil-layer blasthole plugging agent at low temperature according to claim 1 is characterized in that: the sulfonation degree of sulfonation tannin is 50-80%.
3. a kind of oil-layer blasthole plugging agent at low temperature according to claim 1 is characterized in that: this plugging agent is applicable to the oil reservoir of 30 ℃ of-60 ℃ of temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101004414A CN100387678C (en) | 2006-06-28 | 2006-06-28 | Oil-layer blasthole plugging agent at low temperature |
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| CNB2006101004414A CN100387678C (en) | 2006-06-28 | 2006-06-28 | Oil-layer blasthole plugging agent at low temperature |
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| CN100387678C true CN100387678C (en) | 2008-05-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671551B (en) * | 2009-06-17 | 2012-05-30 | 东营泰尔石油技术有限公司 | Multifunctional connecting bridging agent |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191024B (en) * | 2011-04-11 | 2013-04-24 | 大庆石油管理局 | Curable leak-stopping agent |
| CN103952129B (en) * | 2014-04-22 | 2016-08-24 | 西安石油大学 | A kind of oil gas well cementing operation cement sheath selfreparing liquid and preparation and application thereof |
| CN106479462A (en) * | 2016-08-26 | 2017-03-08 | 北京华油陆海科技有限公司 | A kind of blocking agent and preparation method thereof and oil well casing leak stopping envelope alter method |
| CN118325592A (en) * | 2019-04-26 | 2024-07-12 | 科维亚解决方案公司 | Borehole spherical plugging agent and method for temporarily plugging borehole of oil well or gas well |
| CN111849441B (en) * | 2020-06-29 | 2022-06-03 | 山东华茂石油技术开发有限公司 | Low-temperature oil layer blast hole plugging agent, preparation method and use method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095402A (en) * | 1993-05-14 | 1994-11-23 | 大庆石油管理局采油工艺研究所 | Plugging agent for oil well |
| CN1566254A (en) * | 2003-06-26 | 2005-01-19 | 大庆油田有限责任公司 | Cement fly ash profile control agent for plugging of oil and water well |
| US20050204961A1 (en) * | 2004-03-17 | 2005-09-22 | Jiten Chatterji | Cement compositions comprising improved lost circulation materials and methods of use in subterranean formations |
-
2006
- 2006-06-28 CN CNB2006101004414A patent/CN100387678C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095402A (en) * | 1993-05-14 | 1994-11-23 | 大庆石油管理局采油工艺研究所 | Plugging agent for oil well |
| CN1566254A (en) * | 2003-06-26 | 2005-01-19 | 大庆油田有限责任公司 | Cement fly ash profile control agent for plugging of oil and water well |
| US20050204961A1 (en) * | 2004-03-17 | 2005-09-22 | Jiten Chatterji | Cement compositions comprising improved lost circulation materials and methods of use in subterranean formations |
Non-Patent Citations (1)
| Title |
|---|
| 20040045713A1 2004.03.11 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671551B (en) * | 2009-06-17 | 2012-05-30 | 东营泰尔石油技术有限公司 | Multifunctional connecting bridging agent |
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| CN1896176A (en) | 2007-01-17 |
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