CN104762072A - Penetrating selective plugging agent and preparation method and application method thereof - Google Patents
Penetrating selective plugging agent and preparation method and application method thereof Download PDFInfo
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- CN104762072A CN104762072A CN201510078131.6A CN201510078131A CN104762072A CN 104762072 A CN104762072 A CN 104762072A CN 201510078131 A CN201510078131 A CN 201510078131A CN 104762072 A CN104762072 A CN 104762072A
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- blocking agent
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- property blocking
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Abstract
The invention relates to a penetrating selective plugging agent which is prepared as follows: 400 parts by weight of water is added with a main agent comprising 10-20 parts by weight of ultrafine oilwell cement and 80-100 parts by weight of superfine ore slag, 15-30 parts by weight of a tackifier, 0-2 parts by weight of a coagulation accelerator, 0-2 parts by weight of a retarder and 1-10 parts by weight of a stabilizer; and the average particle size of the main agent is 15 to 16 mum. The penetrating selective plugging agent has good stability, and is wide in adaptation range of water mineralization degree, low in viscosity, and good in pumping performance, after the penetrating selective plugging agent is squeezed into the formation, a large pore path can be selectively plugged, and the penetrating selective plugging agent may not enter medium-low permeability formation, may not damage the formation and reservoir stratum, and has good resistance to high temperature. The invention also relates to a preparation method and an application method of the penetrating selective plugging agent, a better plugging effect can be played, plugging is achieved without sealing off, and mud acid can be used for plugging releasing.
Description
Technical field
The present invention relates to a kind of permselective property blocking agent, meanwhile, the invention still further relates to preparation method and the using method of this permselective property blocking agent.
Background technology
The mode that the oil field of domestic 80% has entered into waterflooding all is exploited, and arrived the high water-cut development stage at present, the composite water cut in most of oil field is up to more than 80% according to statistics, and the composite water cut of some maturing fields is especially up to more than 90%.Oil field long-term injecting water exploitation, due to the nonuniformity of oil reservoir, oil, the difference in water viscosity and the imbalance in profit well group, must cause injecting that water is charged into along high permeable strip, channelling is to recovery well, involve degree to low permeability layer low, cause the cycle efficiency injecting water low.People seek to adopt various technology and means to improve tar productivity always, wherein oilwell water shutoff, Profile Control in Injection Well are widely used as the effective technique means of one, as Chinese patent CN101451061B relates to a kind of research of sand consolidation and water plugging profile control agent made by oil sand, CN101898860B provides a kind of inorganic profile control agent with oil sludge and application method thereof, and CN103232838A discloses a kind of preparation and application method etc. thereof of cement profile control agent.But although water blockoff can control invalid product water according to a conventional method, but also have lost most of reserves, and be broken along with part well interlayer cement mantle, cause serious interlayer channelling phenomenon, pkr lost efficacy, and non-selective water-plugging technique receives interbedded water and the indefinite restriction of water exit.In order to improve well recovery amount, in time adjustment intake profile and production profile, abundant shutoff High water cut layer by layer in macropore, low moisture and low permeability pay in Protective Coal Seam, improving employing of reserves in layer is the problem that must solve in oil-field development operation.
Summary of the invention
For solving the deficiencies in the prior art, the invention provides that a kind of selectivity is high, the permselective property blocking agent of good stability.
For achieving the above object, permselective property blocking agent of the present invention, is made up of the component of following weight proportion: add by ultra-fine oil well cement 10 ~ 20 parts and ultrafine slag 80 ~ 100 parts of hosts formed in 400 parts of water, tackifier 15 ~ 30 parts, setting accelerator 0 ~ 2 part, retardant 0 ~ 2 part, stablizer 1 ~ 10 part; The median size of described host is 15 ~ 16 μm.
The rich calcium phase that the host of permselective property blocking agent is made up of ultra-fine oil well cement and ultrafine slag and Si-rich phase form, the Ca-O of rich calcium phase, Mg-O key is much more weak than the Si-O key of Si-rich phase, and there is huge inner ratio surface area, higher thermodynamic phase, therefore the hydraulically active of rich calcium phase is higher than Si-rich phase; On the other hand; rich calcium has again certain kinetic stability mutually; must overcome certain activation energy just can make it destroy, and therefore the activity of host is potential, under normal conditions; the effect of water molecules is not enough to the decomposition activation energy overcoming rich calcium phase;, only can there is slight hydration reaction on its surface in host and water mixing, its moieties is dissolved and aquation; form C-S-H gel, but further aquation stop by the hyposmosis protective membrane on surface.The effect of setting accelerator is exactly make host structure deteriorate, promotes that host carries out hydration and sclerosis reaction again, overcomes the decomposition activation energy of rich calcium phase, react and make rich calcium phased soln.The reaction of rich calcium phase is comparatively violent and rapid, the reaction of Si-rich phase is then comparatively slowly with lasting, the aquation at initial stage is based on the rapid aquation of rich calcium phase and disintegration and cause host vitreum to disintegrate, its hydrated product is filled in former water-filling space, the Si-rich phase departing from original structure is then filled in the gap of rich calcium phase hydrated product, along with the carrying out of Si-rich phase hydration reaction, its hydrated product is constantly filled in previous hydrated product gap, makes the structure of hydrated product finer and close.Selecting the mixture slurry of cement and slag as host raw material, the drawback of independent slurry can being overcome on the one hand, as only used slag material, intensity is low, and breakthrough pressure is low, and after causing construction, bearing capacity is poor, breakthrough time shortens, the problem that after plugging construction, validity period shortens; Only use cement easily to occur the inconsistent problem of slurry at the scene, and easily pollute other slurries of down-hole, and the salt existed in other slurries of down-hole or polymkeric substance may affect the thickening time of cement, cause security incident; On the other hand, mixture slurry is that the selection of assistant agent system provides abundanter scope, for ensureing that more convenient construction safety provides.During preparation permselective property blocking agent system, tackifier are used for the flowing property of regulation system, not stratified, the stability of stablizer for assisting tackifier to guarantee system, setting accelerator coordinates the set time being used for regulation system with retardant, synergy between host and all kinds of assistant agent, make normal temperature lower five kinds of materials that chemical reaction occur extremely slowly, accelerating when entering chemical reaction when stratum reaches certain temperature, generating the silicate solidification body with some strength.Its principal reaction formula is as follows:
3CaO·SiO
2+nH
2O=xCaO·SiO
2·yH
2O+(3-x)Ca(OH)
2
2CaO·SiO
2+nH
2O=xCaO·SiO
2·yH
2O+(2-x)Ca(OH)
2
End product is silicate material, and this substance crystallization is larger, closely cementing, and have certain intensity, resistance to elevated temperatures is good.
Macropore, high permeability formation is optionally entered for enabling permselective property blocking agent of the present invention, do not enter middle low permeability formation, the mean particle size limiting host is 15 ~ 16 μm, build bridge based on 2/3rds theoretical, and utilize the inorganic gel of slag aquation formation in the early stage in host, the particle being mixed in accumulation wherein can well form screen layer, prevents leak stopping from starching and pours into continuing in low permeability layer.The permselective property blocking agent obtained enters macropore with liquid state selectivity, do not enter middle low permeability formation, in stratum, aquation, ion are met again, with sand grains loose in macropore and hole wall cementing, appropriate time solidification as requested, macropore plugging, reaches the object of adjustment reservoir ununiformity, changes the nonuniformity on stratum, unconsolidated formation is consolidation again, reduce formation sand production probability, and seldom enter original reservoir, substantially can not cause damage to reservoir.
As the restriction to aforesaid way, particle diameter≤50 μm of described host.
As the restriction to aforesaid way, described tackifier are lithium aluminosilicate.
As the restriction to aforesaid way, described setting accelerator is nitrite.
As the restriction to aforesaid way, described retardant is hydroxycarboxylate.
As the restriction to aforesaid way, described stablizer is propenyl polymer.
Cement is employed and two kinds, slag reacts with water the material solidified due to host in permselective property blocking agent, in reaction process, there is the situation of collaborative solidification in both, therefore selects setting accelerator and retardant will consider just can reach best result of use to the versatility of bi-material.The selection of tackifier, stablizer, consider that calcium can occur between cement and stratum clay in host invades the situation increasing slurry denseness, and this thickening also can show as certain thixotropy, namely after slurry leaves standstill several minutes, denseness increases sharply, thus the ability that increase slurry is detained in the earth formation, in case grouting body is carried too much by other fluid in stratum, ensure the quality of sealing.
Meanwhile, the preparation method of permselective property blocking agent of the present invention in water, first adds retardant and setting accelerator, stirring and dissolving; Under whipped state, add tackifier and stablizer, make to be uniformly dispersed; Finally add host, under whipped state, obtain the permselective property blocking agent in suspended state.
In the preparation process of permselective property blocking agent, define the addition sequence of retardant, setting accelerator, tackifier, stablizer and host according to the effect of each material in system, make the permselective property blocking agent of acquisition have best performance and effect.
Meanwhile, the using method of permselective property blocking agent of the present invention, comprises the following steps:
Step one, formation pre processing, squeezing spearhead, scavenging solution;
Step 2, continuously squeezing permselective property blocking agent as above;
Step 3, squeezing displacing liquid.
Before squeezing permselective property blocking agent, formation carries out pre-treatment, re-uses spearhead, scavenging solution, squeezes displacing liquid again after squeezing permselective property blocking agent.Cleaned pit shaft by spearhead, reduced formation temperature, scavenging solution removes the organic impurity in duct, and finally blocking agent is replaced design attitude by design requirements and completes squeezing technique by squeezing displacing liquid.
As the restriction to aforesaid way, after squeezing scavenging solution, before permselective property blocking agent, squeezing spacer pad; After squeezing permselective property blocking agent, before displacing liquid, squeezing spacer pad.
Best selectively blocking off effect is played for making permselective property blocking agent of the present invention, extend shutoff timeliness, permselective property blocking agent front spacer pad is used to be pushed open by the water in stratum, reduce plugging agent by water-reducible degree, improve the cementing power on stratum in advance, and reduce the risk that plugging agent runs into other ion, ensure construction safety, and after use spacer pad, remaining alkali also can prevent follow-up permselective property blocking agent from being occurred by the situation being difficult to solidify after diluting at bottom, improves shut-off capacity; Re-use spacer pad after squeezing permselective property blocking agent to solidify to protect permselective property blocking agent, prevent displacing liquid from diluting and cause blocking agent to solidify incomplete, return slag phenomenon.By the plugging effect of preposition, rearmounted spacer pad strengthening permselective property blocking agent.
As the restriction to aforesaid way, described spacer pad is made up of the component of following quality proportioning: add 1 ~ 5 part, sodium hydroxide in 100 parts of water, na montmorillonite 5 ~ 10 parts, Sodium hexametaphosphate 99 0.05 ~ 0.1 part.
As above spacer pad can efficiently coordinate permselective property blocking agent of the present invention to play the plugging effect of highly selective high stability.
In sum, adopt technical scheme of the present invention, the permselective property blocking agent of acquisition has good stability, and there will not be bleeding and segregation phenomenon in layoutprocedure, and wide to the salinity subject range of water, viscosity is lower, pumps into functional; Squeeze into selectively blocking off macropore behind stratum, do not enter middle low permeability formation, change the nonuniformity on stratum, again consolidation unconsolidated formation, does not damage stratum and reservoir, Applicable temperature 30 ~ 190 DEG C, after solidification, temperature resistance ability reaches more than 300 DEG C, and resistance to elevated temperatures is good.This permselective property blocking agent coordinates the use of preflush spacer fluid and rearmounted spacer pad, better can play plugging effect, can accomplish stifled and dead, and available mud acid de-plugging.
Embodiment
Embodiment one
The present embodiment relates to several groups of permselective property blocking agents, fills a prescription as shown in the table:
By the formula of upper table, first in clear water, add retardant and setting accelerator, stirring and dissolving; Under the high-speed stirring of rotating speed 5000r/min, add tackifier and stablizer, make to be uniformly dispersed; Finally add host, under the high-speed stirring of rotating speed 13000r/min, obtain the permselective property blocking agent in suspended state.
Embodiment two
The plugging effect that the present embodiment relates to the permselective property blocking agent of embodiment one detects, and adopts displacement core experiment to detect rate of permeation and sealing ratiod.Experiment rock core is quartz sand epoxy resin cementitious synthetic core, geometrical dimension is: high × wide × long=4.5 × 4.5 × 15cm, for macropore formational situation in simulated formation, hole along rock core length direction, hole depth is 3cm, 6cm and 9cm respectively, aperture is respectively 0.8cm, 1.6cm and 2.5cm, back-up sand in hole, and sand grains particle diameter is between 35-40 order.Experiment water drive process injection speed is 0.6mL/min.
Embodiment 2.1
The present embodiment relates to monolithic core experiment, and operation steps is as follows:
1.. before and after boring back-up sand, rock core water surveys rate of permeation;
2.. inject embodiment 1.1 permselective property blocking agent;
3.. rock core is placed 24 hours under experimental conditions;
4.. water drive, to pressure-stabilisation, calculates rate of permeation and sealing ratiod.
Experimental result sees the following form:
As can be seen from the above table, under the same terms of aperture, increase along with hole is long, sealing ratiod increases; Under the long the same terms in hole, increase with aperture, sealing ratiod increases.As Kong Changwei 9cm, when aperture is 2.5cm, after waiting solidifying 24h, sealing ratiod can reach 90.9%, shows that permselective property blocking agent of the present invention has good shut-off capacity, can be used for the macropore that shutoff stratum Zhong Shui washes away formation.
Embodiment 2.2
The present embodiment relates to two-tube parallel connection experiment, and operation steps is as follows:
1.. before and after boring back-up sand, rock core water surveys rate of permeation;
2.. compose in parallel model by matrix rock core and back-up sand rock core, inject embodiment 1.2 permselective property blocking agent;
3.. rock core is placed 24 hours under experimental conditions;
4.. water drive, to pressure-stabilisation, calculates rate of permeation and sealing ratiod.
High permeability core experiment the results are shown in following table:
Middle rate of permeation core experiment the results are shown in following table:
Low Permeable Cores experimental result sees the following form:
Can find out from upper table, for monolithic rock core, back-up sand reservoir core plugging rate is higher than matrix rock core.For back-up sand rock core, increase along with hole is long, sealing ratiod increases; Under the long the same terms in hole, increase with aperture, sealing ratiod increases.For whole model, as Kong Changwei 9cm, when aperture is 2.5cm, the sealing ratiod after the parallel connection of high permeability rock core can reach 78.1%, shows stronger shut-off capacity.
Embodiment 2.3
The present embodiment relates to two-tube oil displacement experiment in parallel, and operation steps is as follows:
1.. before and after boring back-up sand, rock core water surveys rate of permeation;
2.. rock core saturated oil, calculates oil saturation;
3.. compose in parallel model by matrix rock core and back-up sand rock core, water drive is to moisture 98%;
4.. back-up sand rock core is injected embodiment 1.3 permselective property blocking agent;
5.. back-up sand rock core is placed 24 hours under experimental conditions;
6.. compose in parallel model by matrix rock core and back-up sand rock core, water drive, to moisture 98%, calculates recovery ratio and streaming rate.
Use Kong Changwei 9cm, aperture is the drill core of 1.6cm, and experimental result sees the following form:
As can be seen from the above table, after water drive terminates note permselective property blocking agent, each substratum recovery ratio of model presents to be increased in various degree, and its mesostroma recovery of core amplification is comparatively large, and back-up sand recovery of core amplification is less.Compared with waterflood recovery efficiency factor, transfer drive recovery ratio amplification is 18.2%, shows good profile control effect.
Embodiment three
The present embodiment relates to the field conduct effect of the permselective property blocking agent of embodiment 1.1.
Prepare before construction:
1.. trip out flow string in well, wax removal, measure;
2.. lower scraping tubing string, lower sand-flushing pipe column, clear water sand washing is to artificial bottom of a well, and circulation well cleanup, reaches import and export water quality consistent;
3.. play sand-flushing pipe column, lower squeezing tubing string, install well head, pkr rises envelope, drags for dead fuse;
4.. squeezing equipment transports to well site, and equipment installation connects, by the formulated permselective property blocking agent of embodiment 1.1; By the formula mixing and stirring adding sodium hydroxide 3g, na montmorillonite 6g, Sodium hexametaphosphate 99 0.08g in 100g water, preparation spacer pad; Take clear water as spearhead, Sodium dodecylbenzene sulfonate is scavenging solution, and clear water is that displacing liquid is constructed.
Construction technology:
Step one, water tanker, pump truck are reached the spot, and connect squeezing pipeline, well head and manifold of ground pressure testing 25MP; Formation pre processing, clear water 5m is squeezed in examination
3, formation testing receptivity, squeezing spearhead, scavenging solution, spacer pad;
Step 2, squeezing permselective property blocking agent, observes pressure change continuously, if pressure exceedes the operation pressure upper limit, stop squeezing, wait for pressure diffusion, if occur for twice, operation pressure exceedes the operation pressure upper limit, stops squeezing;
Step 3, squeezing spacer pad, displacing liquid, push away pit shaft by permselective property blocking agent; After replacement terminates, after waiting for pressure diffusion (1-3h), bleed off pressure≤30min; Use working rig deblocking packer, upper lifting pipe post 3-5 root, positive well-flushing 2 weeks, to importing and exporting, water quality is identical, and closing well waits solidifying 72h, completion.
Site operation parameter is as follows:
Well depth: 353 meters;
Sand string: 159 millimeters (lower dark 349 meters);
Oil reservoir position: 270.4-280.3 rice, thickness 10 meters;
Rate of permeation: 1343 millidarcies;
Porosity: 30.4%;
Oil saturation: 39.4%.
Oil recovery data test is as shown in the table:
Can be drawn by oil recovery data, what the use of permselective property blocking agent can significantly improve oil field drives the rate of adopting, and is equipped with the use of spacer pad, can strengthen the plugging effect of permselective property blocking agent, reduce and run slag phenomenon.
Claims (10)
1. a permselective property blocking agent, is characterized in that, is made up of the component of following weight proportion: add by ultra-fine oil well cement 10 ~ 20 parts and ultrafine slag 80 ~ 100 parts of hosts formed in 400 parts of water, tackifier 15 ~ 30 parts, setting accelerator 0 ~ 2 part, retardant 0 ~ 2 part, stablizer 1 ~ 10 part; The median size of described host is 15 ~ 16 μm.
2. permselective property blocking agent according to claim 1, is characterized in that: particle diameter≤50 μm of described host.
3. permselective property blocking agent according to claim 1, is characterized in that: described tackifier are lithium aluminosilicate.
4. permselective property blocking agent according to claim 1, is characterized in that: described setting accelerator is nitrite.
5. permselective property blocking agent according to claim 1, is characterized in that: described retardant is hydroxycarboxylate.
6. permselective property blocking agent according to claim 1, is characterized in that: described stablizer is propenyl polymer.
7. a preparation method for permselective property blocking agent as claimed in claim 1, is characterized in that: in water, first add retardant and setting accelerator, stirring and dissolving; Under whipped state, add tackifier and stablizer, make to be uniformly dispersed; Finally add host, under whipped state, obtain the permselective property blocking agent in suspended state.
8. a using method for permselective property blocking agent, comprises the following steps:
Step one, formation pre processing, squeezing spearhead, scavenging solution;
Step 2, continuously squeezing permselective property blocking agent as claimed in claim 1;
Step 3, squeezing displacing liquid.
9. the using method of permselective property blocking agent according to claim 8, is characterized in that: after squeezing scavenging solution, before permselective property blocking agent, squeezing spacer pad; After squeezing permselective property blocking agent, before displacing liquid, squeezing spacer pad.
10. the using method of permselective property blocking agent according to claim 9, is characterized in that: described spacer pad is made up of the component of following weight proportion: add 1 ~ 5 part, sodium hydroxide in 100 parts of water, na montmorillonite 5 ~ 10 parts, Sodium hexametaphosphate 99 0.05 ~ 0.1 part.
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| CN107366519A (en) * | 2017-07-25 | 2017-11-21 | 中国石油天然气股份有限公司 | A kind of fine profile control method of chemistry |
| CN107698203A (en) * | 2017-09-30 | 2018-02-16 | 西安卓识油田技术服务有限公司 | Old crack sealing agent of consolidation type and preparation method thereof |
| CN111073614A (en) * | 2018-10-18 | 2020-04-28 | 中国石油天然气股份有限公司 | Inorganic composite profile control and plugging agent and preparation method thereof |
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| CN112980411A (en) * | 2021-02-26 | 2021-06-18 | 大庆弘民石油科技有限公司 | Selective long-acting plugging agent for oil field and preparation method thereof |
| CN115449358A (en) * | 2022-08-19 | 2022-12-09 | 延安大学 | Chemical-thermal coupling wax removal and prevention ball and detection method thereof |
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| CN106014330A (en) * | 2016-06-27 | 2016-10-12 | 中国石油天然气股份有限公司 | Method for increasing success rate of chemical plugging of leaking casing damage well |
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| CN107366519A (en) * | 2017-07-25 | 2017-11-21 | 中国石油天然气股份有限公司 | A kind of fine profile control method of chemistry |
| CN107698203A (en) * | 2017-09-30 | 2018-02-16 | 西安卓识油田技术服务有限公司 | Old crack sealing agent of consolidation type and preparation method thereof |
| CN111073614A (en) * | 2018-10-18 | 2020-04-28 | 中国石油天然气股份有限公司 | Inorganic composite profile control and plugging agent and preparation method thereof |
| CN112177578A (en) * | 2020-09-24 | 2021-01-05 | 中海油田服务股份有限公司 | Profile control and flooding agent and profile control and flooding method in oil and gas field layer |
| CN112980411A (en) * | 2021-02-26 | 2021-06-18 | 大庆弘民石油科技有限公司 | Selective long-acting plugging agent for oil field and preparation method thereof |
| CN115449358A (en) * | 2022-08-19 | 2022-12-09 | 延安大学 | Chemical-thermal coupling wax removal and prevention ball and detection method thereof |
| CN115449358B (en) * | 2022-08-19 | 2023-11-14 | 延安大学 | Chemical-thermal coupling paraffin removal and prevention ball and detection method thereof |
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Address after: 100000 Beijing City, Chaoyang District Beichen Road No. 8 apartment block Q room 1006 Applicant after: Dano (Beijing) Petroleum Technology Service Co., Ltd. Address before: 100000 Beijing City, Chaoyang District Jiuxianqiao Road No. 14 Building 5 layer 508 C Applicant before: Dano (Beijing) Petroleum Technology Service Co., Ltd. |
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Application publication date: 20150708 |
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