CN104745163A - Inorganic gel foam system and preparation method and application thereof - Google Patents
Inorganic gel foam system and preparation method and application thereof Download PDFInfo
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- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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Abstract
The invention discloses an inorganic gel foam system, comprising the following components in percentage by mass: 8-12% of a base agent, 2.11-2.35% of an initiator, 0.4-0.5% of aids and 0.3-0.5% of a foaming agent. The preparation method of the inorganic gel foam system, provided by the invention, comprises the following steps: dissolving the base agent into water in proportion and then sequentially adding the initiator, the aids and the foaming agent, and finally uniformly stirring. The prepared inorganic gel foam system can be used for profile control and displacement of a high-temperature high-salinity oil deposit, has relatively good plugging effect on cores different in permeability and also has relatively good washout resistance. In addition, the inorganic gel foam system preferably enters relatively large pores under the injection pressure and has relatively good selective plugging capability for high-permeability zones. The inorganic gel foam system has a plugging effect on water rather than oil and has good selectivity for oil and water.
Description
Technical field
The invention belongs to field of oilfield chemistry, be specifically related to a kind of inorganic gel foam system and preparation method thereof and the application in high temperature and high salt oil deposit transfer drive.
Background technology
Along with the carrying out of China's oil-field development, conventional oil reservoir residue available resources have become fewer and feweri, and in order to seek alternative resource, oilfielders are nontraditional reservoir by target diversion.Many high temperature, the high salinity reservoirs in the oil fields such as triumph, Central Plains, form a large amount of high permeable strip after long-period water drive, injects water and advance by leaps and bounds at a high speed along high permeable strip, and cause middle low permeability pay to be difficult to start, final sweep efficiency is lower.Water plugging and profiling technology is an important Technology in oilfield development process.It can improve water injection profile on the one hand, thus improves the sweep efficiency injecting water; On the other hand it can effectively shutoff most permeable zone, the development degree of oil reservoir is improved, finally reach the object of raising recovery ratio.When conventional blocking agent is used for high temperature and high salt oil deposit, there is the shortcoming of the more weak and less stable of intensity, be difficult to the demand meeting normal transfer drive; Also the problem being difficult to inject stratum is there is when conventional blocking agent is used for LOW PERMEABILITY RESERVOIR in addition.Therefore, exploitation easily injects stratum and the good transfer drive system of temperature resistant antisalt effectively carries out the basis that technological measures such as altering is sealed in profile control and water plugging, the displacement of reservoir oil and thermal recovery, significant for this kind of oil deposil erude petroleum recovery ratio of raising.The oil reservoir that the present invention is directed to the many oil fields of China has high temperature and high salinity, Ca
2+, Mg
2+deng features such as the high and low infiltrations of bivalent cation content, work out a kind of novel inorganic gel foam system being suitable for high temperature and high salt oil deposit, being easy to injection.
Summary of the invention
In order to solve the shortcoming of conventional plugging agent for existing during high temperature and high salt oil deposit transfer drive, an object of the present invention is to provide a kind of inorganic gel foam system and preparation method thereof, and this inorganic gel foam system can be used for high temperature and high salt oil deposit profile control and water plugging.
Inorganic gel foam system provided by the present invention, comprise host, initiator, auxiliary agent and pore forming material, the massfraction of described host, initiator, auxiliary agent and pore forming material is respectively 8% ~ 12%, 2.11% ~ 2.35%, 0.4% ~ 0.5% and 0.3% ~ 0.5%.
In above-mentioned inorganic gel foam system, described host is commercially available polymerize aluminum chloride, in light yellow powder.
In above-mentioned inorganic gel foam system, described initiator is carboxamide.
In above-mentioned inorganic gel foam system, described auxiliary agent is sodium sulfate.
In above-mentioned inorganic gel foam system, described pore forming material is a kind of anion-nonionic tensio-active agent, 90 DEG C ~ 150 DEG C, formation water salinity has good lathering property under condition within being 100000mg/L.
The invention provides the preparation method of above-mentioned inorganic gel foam system, comprise the steps: according to the above ratio host polymerize aluminum chloride to be added to the water dissolving, initiator, auxiliary agent and pore forming material is added successively again according to aforementioned proportion, stir, obtain inorganic gel foam system, initiator carboxamide in this system decomposes and produces ammonia and carbonic acid gas two kinds of gases under oil reservoir hot conditions, forms foam under the effect that wherein carbonic acid gas bubbles at high temperature.And the water-soluble meeting of ammonia makes the pH of system become large gradually, host polymerize aluminum chloride is hydrolyzed generation inorganic gel in the basic conditions, the formation of foam and the generation of gel are carried out simultaneously, and are wrapped in generation gel foam by gel after formation of foam, and foam interface film strength is increased.
Inorganic gel foam system provided by the invention, adapting to reservoir temperature is 90 DEG C ~ 150 DEG C, and pH is more than or equal to the situation of 3.75.
Compare with existing inorganic gel foam system, beneficial effect of the present invention is: inorganic gel foam system provided by the invention, and with the rising of temperature of reaction, its gelation time shortens gradually and rangeability is comparatively large, intensity after system gelling has increased slightly.Along with the increase of formation water salinity, system gelation time shortens slightly, and intensity after gelling and thermostability almost constant.With the increase of pH, system gelation time constantly shortens, intensity after gelling increases gradually, thermostability not too large change.This system to the plugging effect of different rate of permeation rock core better and have good abrasion resistance.In addition, this system preferentially enters larger duct under injection pressure, to produce selectively blocking off ability to high permeability formation stronger.This system has the characteristic of the not stifled oil of water blockoff, better to the selectivity of oil, water.
Accompanying drawing explanation
Figure 1 shows that single tube sand-packed model schema of the present invention.
In figure: 1-constant-flux pump, 2-six-way valve, 3-intermediate receptacle, 5-pharmacy jar, 6-precision pressure gauge, 11-fill out sand tube, 9-graduated cylinder.
Figure 2 shows that the graph of relation that inventive gel foam system gelling rear-guard changes with injection pore volume multiple for pressure reduction.
Figure 3 shows that the two-tube sand-packed model schema of the present invention.
In figure: 1-constant-flux pump, 2-six-way valve, 4-water pot, 12-oil tank, 5-pharmacy jar, 6-precision pressure gauge, the hypotonic fill out sand tube of 7-, 8-are high oozes fill out sand tube, 9-graduated cylinder, 10-valve.
After Figure 4 shows that the gelling of inventive gel foam system, the high and low pipe streaming rate that oozes is with injection pore volume multiple variation relation graphic representation.
Embodiment
Inorganic gel foam system provided by the invention, comprise host, initiator, auxiliary agent and pore forming material, the massfraction of described host, initiator, auxiliary agent and pore forming material is respectively 8% ~ 12%, 2.11% ~ 2.35%, 0.4% ~ 0.5% and 0.3% ~ 0.5%.
Described host is commercially available polymerize aluminum chloride, in light yellow powder.
Described initiator is carboxamide.
Described auxiliary agent is sodium sulfate.
Described pore forming material is a kind of anion-nonionic tensio-active agent, 90 DEG C ~ 150 DEG C, formation water salinity has good lathering property under condition within being 100000mg/L.
The preparation method of inorganic gel foam system provided by the invention, step is as follows:
According to the above ratio host is added to the water dissolving, then adds initiator, auxiliary agent and pore forming material successively according to upper described ratio, stir, obtain described inorganic gel foam system.
The inorganic gel foam system that the invention provides and prepare can be used in high temperature and high salt oil deposit transfer drive, and inorganic gel foam system issues after rubber coagulates in oil reservoir hot conditions has higher intensity and good thermostability, can selectively blocking off high permeability formation.The reservoir temperature that is suitable for be 90 DEG C ~ 150 DEG C, pH is more than or equal to the situation of 3.75.
Hereafter will describe content of the present invention in conjunction with specific embodiments in detail.It should be noted that the combination of technical characteristic or the technical characteristic described in following embodiment should not be considered to isolated, they can mutually be combined thus be reached better technique effect.
Figure 1 shows that single tube sand-packed model schema of the present invention; Figure 2 shows that the graph of relation that inventive gel foam system gelling rear-guard changes with injection pore volume multiple for pressure reduction; Figure 3 shows that the two-tube sand-packed model schema of the present invention; After Figure 4 shows that the gelling of inventive gel foam system, the high and low pipe streaming rate that oozes is with injection pore volume multiple variation relation graphic representation.
Embodiment 1
Sodium sulfate is diluted to the metabisulfite solution that mass concentration is 4%, pore forming material (mass concentration is 100%) is diluted to the solution of 4%.
First in beaker, 10.167mL water is added, take 1.5g polymerize aluminum chloride to add in beaker and to stir, then take 0.333g carboxamide to add in beaker and to stir, in beaker, drip the metabisulfite solution of 1.5g diluted 4% with glue head dropper and stir, dripping the solution & stir that 1.5g diluted in the most backward beaker and evenly obtain inorganic gel foam system.
After tested, this system gelation time under 130 DEG C of conditions is 2.45h, and the intensity after its gelling is 0.024MPa, and the dehydration rate after 15 days is 0%, has good thermostability.
Embodiment 2
Temperature is on the impact of inorganic gel foam system gelation time, intensity and thermostability
As described in Example 1, host mass concentration is 10%, and initiator mass concentration is 2.22%, and auxiliary agent mass concentration is 0.4%, pore forming material mass concentration is 0.4%, changes temperature of reaction research temperature to the impact of the performances such as the intensity after system gelation time, gelling and thermostability.Experimental result is as shown in table 1.
Table 1 temperature is on the impact of inorganic gel foam system performance
Note 1: under "---" represents not gelling situation in table, does not have dehydration rate after the intensity after gelling and 30d.
Experimental result shows: along with the rising of temperature of reaction, and the gelation time of inventive gel foam system constantly shortens and rangeability is comparatively large, intensity after gelling has increased slightly, thermostability is deteriorated slightly.
Embodiment 3
Formation water salinity is on the impact of inorganic gel foam system gelation time, intensity and thermostability
As described in Example 1, host mass concentration is 10%, initiator mass concentration is 2.22%, host mass concentration is 0.4%, pore forming material mass concentration is 0.4%, use the local water preparation formula solution of different salinity respectively, investigate formation water salinity to the impact of system gelation time, intensity and thermostability, wherein the ionic group of local water becomes: Na
+, Ca
2+and Cl
-, experimental temperature is 130 DEG C.Experimental result is as shown in table 2.
Table 2 formation water salinity is on the impact of inorganic gel foam system performance
Experimental result shows: the gelation time of inorganic gel foam system of the present invention reduces slightly with the increase of formation water salinity, and this is mainly because Ca
2+deng inorganic ion, there is short solidifying effect, the electrostatic double layer on compressible colloidal particle surface, impel its crosslinked or coagulation.And intensity after system gelling and thermostability almost constant with the increase of formation water salinity.
Embodiment 4
PH is on the impact of inorganic gel foam system gelation time, intensity and thermostability
As described in Example 1, fixing host mass concentration is 10%, initiator mass concentration is 2.22%, host mass concentration is 0.4%, pore forming material mass concentration is 0.4%, by dripping the pH of damping fluid (sodium carbonate or acetic acid) regulation system in formula solution, research pH is on the impact of intensity and thermostability after the gelation time of this gel-foam system, gelling, be wherein about 3.75 with the pH of system during distilled water preparation formula solution, count the pH detecting formula solution with Sartorius PB-10pH, experimental temperature is 130 DEG C.Experimental result is as shown in table 3.
Table 3pH is on the impact of inorganic gel foam system performance
Attached 2: in table, "---" does not have dehydration rate after the intensity after gelling and 30d under representing not gelling situation.
Experimental result shows: along with the increase of pH, the gelation time of inventive gel foam system constantly shortens, and (this is mainly because along with the increase of pH, system reaches the cause of the time shorten of alkaline condition needed for gelling reaction), intensity after gelling increases gradually, thermostability not too large change, wherein system all not gellings when pH is less than 3.75.
Embodiment 5
Inorganic gel foam system seal-off effect and flushing resistance
Single tube sand-packed model is adopted to measure seal-off effect and the abrasion resistance of this system.In single tube sand-packed model, the order of connection of constant-flux pump 1, six-way valve 2, intermediate receptacle 3, pharmacy jar 5, precision pressure gauge 6, fill out sand tube 11 and graduated cylinder 9 as shown in Figure 1.Experimentation is: the quartz sand of filling appropriate particle size in 30cm fill out sand tube 11, and with the speed displacement of 1mL/min, water surveys the rate of permeation K injected before formula solution
0, with the flow velocity of 1mL/min, gel-foam system as described in Example 1 for 0.3PV being injected in fill out sand tube 11, treating that gelling occurs for it by putting into 130 DEG C of thermostat containers after fill out sand tube 11 good seal.Continue the flow velocity displacement with 1mL/min after system gelling, make displacement pressure reduction-injection pore volume multiple relation curve and observe the change of displacement pressure reduction with injection pore volume multiple, after displacement pressure is stable, calculates rate of permeation K after blocking up
1and press formula: E=(K
0-K
1)/K
0× 100% calculates sealing ratiod E.Sealing ratiod is recalculated and in conjunction with displacement pressure reduction-injection pore volume multiple relation curve to investigate the flushing resistance of gel-foam system when injecting 15PV.Experimental result is as shown in table 4.
Table 4 sand-filling tube model data sheet
Experimental result shows: this gel-foam system all has good sealing characteristics in different permeability formations, is particularly useful for the shutoff of middle low permeability formation.Fig. 2 graph of relation that to be system gelling rear-guard change with injection pore volume multiple for pressure reduction, graphic representation when figure intermediate cam sigmoid curve is k=0.406D, square is k=1.051D, round dot is k=2.754D, rhombus be k=5.096D and fork-shaped is k=9.747D.Can find out that after calculating sealing ratiod, to continue the sealing ratiod that water drive recalculates to 15PV is more or less the same with the sealing ratiod calculated for the first time by table 4, as seen from Figure 2 when continue after sequent water flooding pressure-stabilisation water drive to pressure during 15PV with first steadily time pressure difference very micro-, namely this gel-foam system has good flushing resistance.
Embodiment 6
Inorganic gel foam system is to high and low selectively blocking off ability of oozing stratum
Two-tube sand-packed model is adopted to measure this system to high and low selectively blocking off performance of oozing stratum, in two-tube sand-packed model, constant-flux pump 1, six-way valve 2, water pot 4, oil tank 12, pharmacy jar 5, precision pressure gauge 6, hypotonic fill out sand tube 7, height ooze the annexation of fill out sand tube 8, graduated cylinder 9 and valve 10 as shown in Figure 3.Experimentation is: ooze fill out sand tube 8 with the fill out sand tube 11 that the quartz sand of appropriate particle size fills 2 rate of permeation different simultaneously as hypotonic fill out sand tube 7 and height, with the speed displacement of 1mL/min, measure these two fill out sand tube 11 water and survey rate of permeation, ensure that their permeability grade is about 5; By hypotonic fill out sand tube 7 with highly ooze fill out sand tube 8 parallel connection and carry out water drive and calculate respective streaming rate, until hypotonic fill out sand tube 7 and the high streaming rate oozing fill out sand tube 8 basicly stable till; Hypotonic fill out sand tube 7 and height ooze fill out sand tube 8 general injection 0.3PV gel foam formula solution in parallel, calculate respective streaming rate in experimentation; Put into 130 DEG C of thermostat containers after hypotonic fill out sand tube 7 and height are oozed fill out sand tube 8 good seal and treat that gelling occurs for it, two pipes sequent water flooding in parallel also calculates respective streaming rate, till the streaming rate of these two fill out sand tube 11 is basicly stable; Last experimentally result is made high by 8, low 7 and is oozed the streaming rate of pipe with injection pore volume multiple change curve, and as shown in Figure 4, in figure, rhombus is that height oozes pipe 8 streaming rate, and trilateral is hypotonic pipe 7 streaming rate, and round dot is represented as pressure.The change of pressure is recorded in whole experimentation.
As seen from Figure 4: before gel-filled foam system, the streaming rate that height oozes fill out sand tube 8 is about 96.5%, and the streaming rate of hypotonic fill out sand tube 7 is about 3.5%; Injecting gel-foam system occurs after gelling until it, and the streaming rate decline that height oozes fill out sand tube 8 is finally about 21%, and it is finally about 79% that the streaming rate of hypotonic fill out sand tube 7 rises.Show that this system preferentially can enter larger duct, produce selectively blocking off effect to high permeability formation under injection pressure.
Embodiment 7
Inorganic gel foam system is to selectively blocking off ability that is moisture and saturated core
Experiment adopts single tube sand-packed model, and experiment flow as shown in Figure 1.Experimentation is: fill two fill out sand tube 11 with the quartz sand of same particle size simultaneously, with the speed displacement of 1mL/min, measures these two fill out sand tube 11 water and surveys rate of permeation; Wherein fill out sand tube 11 injects the gel foam solution of 0.3PV; After another root fill out sand tube 11 saturation simulation oil, water drive also measures the rate of permeation of aqueous phase now to residual oil saturation, then also injects the gel-foam system of 0.3PV, puts into 130 DEG C of thermostat containers and treat that gelling occurs for it after being sealed by these two fill out sand tube 11; Continue water drive after blocking agent gelling, measure the water phase permeability of moisture and saturated core respectively and calculate this blocking agent and make degree that is moisture or saturated core permeability plugging.Experimental result is as shown in table 5.
Table 5 gel foam is to shutoff situation that is moisture and saturated core
Experimental result as can be seen from table 5: moisture rock core permeability plugging 93.20% can be made after injecting gel-foam system gelling, there is good water blockoff ability; Make saturated core permeability plugging only 33.39%, stifled oily effect is poor.
Although give some embodiments of the present invention, it will be understood by those of skill in the art that without departing from the spirit of the invention herein, can change embodiment herein.Above-described embodiment is exemplary, should using embodiment herein as the restriction of interest field of the present invention.
Claims (8)
1. an inorganic gel foam system, it is characterized in that, comprise host, initiator, auxiliary agent and pore forming material, the massfraction of described host, initiator, auxiliary agent and pore forming material is respectively 8% ~ 12%, 2.11% ~ 2.35%, 0.4% ~ 0.5% and 0.3% ~ 0.5%.
2. a kind of inorganic gel foam system as claimed in claim 1, is characterized in that, described host is commercially available polymerize aluminum chloride.
3. a kind of inorganic gel foam system as claimed in claim 1 or 2, is characterized in that, described initiator is carboxamide.
4. a kind of inorganic gel foam system as claimed any one in claims 1 to 3, is characterized in that, described auxiliary agent is sodium sulfate.
5. a kind of inorganic gel foam system according to any one of Claims 1-4, is characterized in that, described pore forming material is a kind of anion-nonionic tensio-active agent.
6. a kind of inorganic gel foam system as claimed in claim 5, is characterized in that, described anion-nonionic tensio-active agent 90 DEG C ~ 150 DEG C, formation water salinity has good lathering property under condition within being 100000mg/L.
7. as described in a kind of according to any one of claim 1 to 6, the preparation method of inorganic gel foam system, is characterized in that, comprise the steps:
In ratio according to claim 1, host is added to the water dissolving, then adds initiator, auxiliary agent and pore forming material successively according to ratio according to claim 1, stir, obtain described inorganic gel foam system.
8. the application of the inorganic gel foam system according to any one of claim 1 to 7, it is characterized in that: can be used in high temperature and high salt oil deposit transfer drive, described inorganic gel foam system issues after rubber coagulates in oil reservoir hot conditions has higher intensity and good thermostability, can selectively blocking off high permeability formation.
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| CN107815301A (en) * | 2017-10-23 | 2018-03-20 | 中国石油大学(北京) | A kind of micro- dispersion gel strengthening foam system and evaluation method |
| CN109356550A (en) * | 2018-12-24 | 2019-02-19 | 陕西明德石油科技有限公司 | Extra permeability oilfield selectivity frothy gel water plugging profile control agent |
| CN111980644A (en) * | 2019-05-23 | 2020-11-24 | 中国石油天然气股份有限公司 | Experimental system and method for evaluating air foam assisted steam flooding to recover thickened oil |
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