CN101475794A - High temperature resistant and salt resistant chemical water blockoff agent and production method thereof - Google Patents
High temperature resistant and salt resistant chemical water blockoff agent and production method thereof Download PDFInfo
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- CN101475794A CN101475794A CNA2009103001486A CN200910300148A CN101475794A CN 101475794 A CN101475794 A CN 101475794A CN A2009103001486 A CNA2009103001486 A CN A2009103001486A CN 200910300148 A CN200910300148 A CN 200910300148A CN 101475794 A CN101475794 A CN 101475794A
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- water blockoff
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Abstract
The invention relates to the technical field of a composition for hole boring or well boring, in particular to a chemical plugging agent with high temperature resistance and salt resistance, and a production method thereof. The plugging agent comprises a main agent, a curing agent and water according to the raw material composition, wherein the main agent is polysilicon powder of which the sodium silicate modulus is between 3.1 and 3.6, and the curing agent adopts one of furfural, furfuryl alcohol, sodium phosphate, sodium polyphosphate, calcium chloride hexahydrate and magnesium chloride hexahydrate. The chemical plugging agent has the advantages of easy preparation, low solution viscosity, good pumpability, excellent injection capability, simple construction process and high construction efficiency, and is advantageous to enter the deep part of stratums selectively. At a temperature of between 80 and 160 DEG C, the chemical plugging agent can generate stable coagulated bodies which have the strength values of more than 100KPa and can be coagulated with scattered quartz sand into a whole, and the strength value of the whloe reaches more than 2.6 MPa; in addition, the chemical plugging agent has long stabilization time under a high temperature condition, and can meet the needs of a high temperature stratum condition. Although the strength is strong, the chemical plugging agent can be removed by chemical substances so as to eliminate accidents caused by incorrect processing.
Description
One, technical field
The present invention relates to be used to hole or the technical field of compositions of drilling well, is a kind of high temperature resistant and salt resistant chemical water blockoff agent and production method thereof.
Two, background technology
The employed plugging agent in oil field is a main raw with the polymer gel class mostly at present, at the polymer gel plugging agent of report, is to be mixed with the plugging agent that solution forms with polymer powder and water, and each elephant is applied such blocking agent in the world.But this class plugging agent can not satisfy the formation condition of high temperature and high salt, and in polymkeric substance blocking agent process for preparation, disperse owing to polymer beads is difficult, in solution, form " flake ", cause infusion and gel-forming property variation, influence water plugging effect, do not reach the purpose of water blockoff.And polymer formulation dissolving in use not exclusively, and soltion viscosity is big, and the infusion resistance is big, is easy to make the shortcoming of equipment obstructions such as pipeline.Carrying out along with oilfield exploitation, the oil field progresses into the high water-cut development period development phase, exist most permeable zone in the stratum, in the application process of " polymer gel plugging agent ", for high temperature and high salt oil deposit polymkeric substance plugging agent bad adaptability, and the height on the stratum to permeate into colloidality poor, even, produce to the oil field and to cause serious harm
Three, summary of the invention
The invention provides a kind of high temperature resistant and salt resistant chemical water blockoff agent and production method thereof, overcome the deficiency of above-mentioned prior art, its low production cost, under the high salt highly compressed of stratum high-temperature condition, can react the integral body that generation is solidified, preparation is simple, easy construction, wide adaptability.
One of technical scheme of the present invention is achieved like this: a kind of high temperature resistant and salt resistant chemical water blockoff agent, it consists of the water of host 20% to 25%, solidifying agent 8% to 12% and surplus by raw material weight per-cent, wherein, host is poly-silica flour, one of the water glass modulus that should gather silica flour is 3.1 to 3.6, in solidifying agent employing furfural, furfuryl alcohol, sodium phosphate, sodium polyphosphate, calcium chloride hexahydrate and the magnesium chloride hexahydrate.
Be further optimization and/or improvements below to the invention described above technical scheme:
The viscosity of above-mentioned high temperature resistant and salt resistant chemical water blockoff agent can be less than 10mpa.s.
The screen over-size of above-mentioned host is less than or equal to 8% by 0.3mm standard sieve surplus, and the moisture content of host is less than or equal to 15%.
Two of technical scheme of the present invention is achieved like this: a kind of production method of above-mentioned high temperature resistant and salt resistant chemical water blockoff agent, it is undertaken by following step: the host, solidifying agent and the water that at first take by weighing requirement, next adds the above-mentioned host that takes by weighing makes host fully dissolve in the entry, and then above-mentioned solidifying agent adding and the thorough mixing that takes by weighing obtained high temperature resistant and salt resistant chemical water blockoff agent.
The present invention prepares easily, and soltion viscosity is low, and pumpability is good, has good injectability, and construction technology is simple, helps optionally entering into earth formation deep, the operating efficiency height.The present invention can generate the concrement of stable performance in 80 ℃ to 160 ℃, its intensity level is all greater than 100KPa, and can condense into an integral body with diffusing shape quartz sand, and its intensity level reaches more than the 2.6MPa, in hot conditions following steady time of length, can satisfy the needs of high-temperature stratum condition.Though the present invention's intensity is big, available chemical substance is removed it, can get rid of mistake like this and handle the accident that causes.
Four, description of drawings
Accompanying drawing 1 is the relation of preparation time of the present invention and soltion viscosity.
Accompanying drawing 2 is the relation of consumption of the present invention and rock core injection pressure.
Accompanying drawing 3 is thermal stability test result of the present invention.
The relation that accompanying drawing 4 washes away multiple and rock core plugging rate for the present invention after stifled.
Five, embodiment
The present invention is not subjected to the restriction of following embodiment, can determine concrete embodiment according to the technical scheme and the practical situation of the invention described above.
Embodiment 1: this high temperature resistant and salt resistant chemical water blockoff agent consists of the water of host 20%, solidifying agent 8% and surplus by raw material weight per-cent, wherein, host is poly-silica flour, one of the water glass modulus that should gather silica flour is 3.1 to 3.6, in solidifying agent employing furfural, furfuryl alcohol, sodium phosphate, sodium polyphosphate, calcium chloride hexahydrate and the magnesium chloride hexahydrate.
Embodiment 2: this high temperature resistant and salt resistant chemical water blockoff agent consists of the water of host 25%, solidifying agent 12% and surplus by raw material weight per-cent, wherein, host is poly-silica flour, one of the water glass modulus that should gather silica flour is 3.1 to 3.6, in solidifying agent employing furfural, furfuryl alcohol, sodium phosphate, sodium polyphosphate, calcium chloride hexahydrate and the magnesium chloride hexahydrate.
Embodiment 3: this high temperature resistant and salt resistant chemical water blockoff agent consists of the water of host 20%, solidifying agent 12% and surplus by raw material weight per-cent, wherein, host is poly-silica flour, one of the water glass modulus that should gather silica flour is 3.1 to 3.6, in solidifying agent employing furfural, furfuryl alcohol, sodium phosphate, sodium polyphosphate, calcium chloride hexahydrate and the magnesium chloride hexahydrate.
Embodiment 4: this high temperature resistant and salt resistant chemical water blockoff agent consists of the water of host 25%, solidifying agent 8% and surplus by raw material weight per-cent, wherein, host is poly-silica flour, one of the water glass modulus that should gather silica flour is 3.1 to 3.6, in solidifying agent employing furfural, furfuryl alcohol, sodium phosphate, sodium polyphosphate, calcium chloride hexahydrate and the magnesium chloride hexahydrate.
Embodiment 5: this high temperature resistant and salt resistant chemical water blockoff agent consists of the water of host 22%, solidifying agent 10% and surplus by raw material weight per-cent, wherein, host is poly-silica flour, one of the water glass modulus that should gather silica flour is 3.1 to 3.6, in solidifying agent employing furfural, furfuryl alcohol, sodium phosphate, sodium polyphosphate, calcium chloride hexahydrate and the magnesium chloride hexahydrate.
Embodiment 6: this high temperature resistant and salt resistant chemical water blockoff agent consists of the water of host 20% to 25%, solidifying agent 8% to 12% and surplus by raw material weight per-cent, wherein, host is poly-silica flour, one of the water glass modulus that should gather silica flour is 3.1 to 3.6, in solidifying agent employing furfural, furfuryl alcohol, sodium phosphate, sodium polyphosphate, calcium chloride hexahydrate and the magnesium chloride hexahydrate.
In the foregoing description 1 to 6, the viscosity of this high temperature resistant and salt resistant chemical water blockoff agent is less than 10mpa.s, and the screen over-size of host is less than or equal to 8% by 0.3mm standard sieve surplus, and the moisture content of host is less than or equal to 15%.
In the foregoing description 1 to 6, the production method of its high temperature resistant and salt resistant chemical water blockoff agent is undertaken by following step: the host, solidifying agent and the water that at first take by weighing requirement, next adds the above-mentioned host that takes by weighing makes host fully dissolve in the entry, and then above-mentioned solidifying agent adding and the thorough mixing that takes by weighing obtained high temperature resistant and salt resistant chemical water blockoff agent.
The foregoing description 1 to 6 gained high temperature resistant and salt resistant chemical water blockoff agent is carried out performance test, and its concrete test result is as follows:
(1) preparation experiment of the present invention
Under the agitation condition, dissolving host adds solidifying agent more earlier, and each viscosity constantly of poly-silicon system solution of condensing is regularly measured in sampling while stirring, and test-results is seen accompanying drawing 1.
Can find out from experimental phenomena and accompanying drawing 1: solution of the present invention is through the stirring preparation of 10min to 30min, the viscosity of its solution is lower, and viscosity kept stable, can utilize this characteristic during construction, by design quantity starting material are directly poured in the water in dosing pond and stirred, pump in the well then, thereby simplify construction technology, improve operating efficiency.
(2) temperature tolerance experiment of the present invention
Solution of the present invention is poured into respectively in the special stainless steel vessel of sealing, be put in then in the thermostat container of design temperature.Regularly take out, observe the variation of gelinite, and survey its gel strength, the results are shown in Table 1 with the hydraulic pressure strength trier.
Table 1 temperature tolerance test-results of the present invention
As can be seen from Table 1, solution of the present invention all can generate the gelinite that has than high-gel strength in 90 ℃ to 150 ℃, and the gel strength temperature influence is less, and stable performance has high thermal resistance preferably, can satisfy the requirement of high-temperature stratum condition.
(3) rock core test of the present invention
1. injectability of the present invention
Fill and present rock core No. 1, under 120 ℃, press above-mentioned testing sequence saturated core with simulated formation water, and carry out water drive, survey this rock pore volume, initial rate of permeation respectively; Inject solution 50PV of the present invention with continuous injection mode again, observe injectability of the present invention, and measure rock core in solution injection process of the present invention, the injection pressure of rock core and core permeability, test-results is seen accompanying drawing 2.
Along with the lasting injection of solution of the present invention, though the injection pressure of rock core and rate of permeation have fluctuation, intensity of variation is very little, and injection pressure still keeps relatively low value.Therefore, the colloid that condenses has good injectability, can satisfy the on-the-spot construction requirement that injects.
2. the present invention is to the blocking ability of different rate of permeation single tube rock cores
Fill and present No. 2～No. 6 rock cores of different rate of permeation rock cores respectively, under 120 ℃, press above-mentioned testing sequence saturated core with simulated formation water, and carry out water drive, survey its rock pore volume, initial rate of permeation respectively; Inject the solution of the present invention of 1PV in rock core, constant temperature was surveyed the breakthrough pressure of its rock core, stifled back rate of permeation forward or backwards, and is calculated its plugging rate after 12 hour.Testing data sees Table 2.
Table 2 the present invention is to single tube rock core blocking ability test-results
As can be seen from Table 2, the present invention has very strong blocking ability to different rate of permeation single tube rock cores, and no matter this system is as amendment, or plugging agent, and all more than 98%, breakthrough pressure is greater than 1.5MPa to the sealing ratiod of rock core.Test-results shows: the present invention has very strong shut-off capacity to water.
3. the thermostability of the present invention in rock core
A. the thermostability of the present invention in rock core
Fill No. 7 rock core, under 120 ℃, press above-mentioned saturated core testing sequence with simulated formation water, and carry out water drive, survey its rock pore volume, initial rate of permeation respectively; In rock core, inject the solution of the present invention of 3PV, distinguish 1 day (d), 15 days (d) of constant temperature, 30 days (d), measure the stifled back rate of permeation of rock core, calculate the plugging rate of this rock core.Thermostability of the present invention is weighed in variation with the plugging rate under the rock core constant temperature different time of stifled back.Test-results is seen accompanying drawing 3.
As can be seen from the test results, under the constant temperature different time, be interrupted stifled back rock core is carried out anti-washout test, the plugging rate of rock core has to a certain degree fluctuation, but through after 30 days, the present invention to the plugging rate of rock core still greater than 90%.Test shows: the present invention's stable performance in 120 ℃ rock core, have high thermal resistance preferably, and can satisfy the requirement of high-temperature stratum condition.
B. the present invention's anti-salt experiment in rock core
Fill No. 8 rock core, under 120 ℃, press above-mentioned testing sequence saturated core with simulated formation water, and carry out water drive, survey its rock pore volume, initial rate of permeation (3.7159um respectively
2); Inject the solution of the present invention of 3PV in rock core, constant temperature carried out water drive for test after 24 hours, measured the stifled back rate of permeation of rock core under different displacement multiples respectively, and calculated corresponding rock core plugging rate.Test-results is seen accompanying drawing 4.
By accompanying drawing 4 as can be seen: along with constantly carrying out of water drive, the plugging rate of rock core and stifled back rate of permeation have fuctuation within a narrow range, the rate of permeation of rock core rises to some extent, plugging rate descends to some extent, injection water through 100PV washes away, the present invention still remains on more than 97% the rock core plugging rate, illustrates that the present invention has abrasion resistance energy preferably in rock core.
(4) brief summary
1. the present invention prepares easily, and soltion viscosity is low, and pumpability is good, has good injectability, and construction technology is simple, helps optionally entering into earth formation deep, the operating efficiency height.
2. the present invention can generate the concrement of stable performance in 80 ℃ to 160 ℃, its intensity level is all greater than 100KPa, and can condense into an integral body with diffusing shape quartz sand, and its intensity level reaches more than the 2.6MPa, in hot conditions following steady time of length, can satisfy the needs of high-temperature stratum condition.
Though 3. the present invention intensity is big, available chemical substance is removed it, can get rid of mistake like this and handle the accident that causes.
Claims (5)
- [claim 1] 1, a kind of high temperature resistant and salt resistant chemical water blockoff agent, it is characterized in that consisting of the water of host 20% to 25%, solidifying agent 8% to 12% and surplus by raw material weight per-cent, wherein, host is poly-silica flour, one of the water glass modulus that should gather silica flour is 3.1 to 3.6, in solidifying agent employing furfural, furfuryl alcohol, sodium phosphate, sodium polyphosphate, calcium chloride hexahydrate and the magnesium chloride hexahydrate.
- [claim 2] 2, high temperature resistant and salt resistant chemical water blockoff agent according to claim 1 is characterized in that viscosity is less than 10mpa.s.
- [claim 3] 3, high temperature resistant and salt resistant chemical water blockoff agent according to claim 1 and 2 is characterized in that the screen over-size of host is less than or equal to 8% by 0.3mm standard sieve surplus, and the moisture content of host is less than or equal to 15%.
- The production method of [claim 4] 4, a kind of high temperature resistant and salt resistant chemical water blockoff agent according to claim 1 and 2, it is characterized in that being undertaken: the host, solidifying agent and the water that at first take by weighing requirement by following step, next adds the above-mentioned host that takes by weighing makes host fully dissolve in the entry, and then above-mentioned solidifying agent adding and the thorough mixing that takes by weighing obtained high temperature resistant and salt resistant chemical water blockoff agent.
- The production method of [claim 5] 5, a kind of high temperature resistant and salt resistant chemical water blockoff agent according to claim 3, it is characterized in that being undertaken: the host, solidifying agent and the water that at first take by weighing requirement by following step, next adds the above-mentioned host that takes by weighing makes host fully dissolve in the entry, and then above-mentioned solidifying agent adding and the thorough mixing that takes by weighing obtained high temperature resistant and salt resistant chemical water blockoff agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009103001486A CN101475794A (en) | 2009-01-12 | 2009-01-12 | High temperature resistant and salt resistant chemical water blockoff agent and production method thereof |
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| CNA2009103001486A CN101475794A (en) | 2009-01-12 | 2009-01-12 | High temperature resistant and salt resistant chemical water blockoff agent and production method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103666418A (en) * | 2012-09-18 | 2014-03-26 | 中国石油天然气股份有限公司 | Gel profile control agent |
| CN104198335A (en) * | 2014-08-11 | 2014-12-10 | 中国石油天然气股份有限公司 | Method for evaluating high-temperature alkali-resisting profile control agent |
| CN107298968A (en) * | 2016-04-14 | 2017-10-27 | 中国石油化工股份有限公司 | A kind of haydite filling fractured well silicon urea formaldehyde sealing agent and its application process |
-
2009
- 2009-01-12 CN CNA2009103001486A patent/CN101475794A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103666418A (en) * | 2012-09-18 | 2014-03-26 | 中国石油天然气股份有限公司 | Gel profile control agent |
| CN104198335A (en) * | 2014-08-11 | 2014-12-10 | 中国石油天然气股份有限公司 | Method for evaluating high-temperature alkali-resisting profile control agent |
| CN107298968A (en) * | 2016-04-14 | 2017-10-27 | 中国石油化工股份有限公司 | A kind of haydite filling fractured well silicon urea formaldehyde sealing agent and its application process |
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Open date: 20090708 |