CN1982407A - SJT-B-oil-displacing synergist - Google Patents
SJT-B-oil-displacing synergist Download PDFInfo
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- CN1982407A CN1982407A CN 200610016674 CN200610016674A CN1982407A CN 1982407 A CN1982407 A CN 1982407A CN 200610016674 CN200610016674 CN 200610016674 CN 200610016674 A CN200610016674 A CN 200610016674A CN 1982407 A CN1982407 A CN 1982407A
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Abstract
A SJT-B oil-displacing synergist has various functions: it can increase slow-releasing and antifouling effect, and strengthen anti-salting, alkaline-resisting and hard-water-resisting roles, it could constitute binary or triple composite oil-displacing scheme, substitute ternary composite alkaline preparation, decrease water interface tension and improve utilization rate of polymer surface activator.
Description
Technical field:
The inhibition of oil exploration industry, antiscale, displacement of reservoir oil synergy.
Background technology:
China's overwhelming majority Oilfield using water-drive oil recovery or chemical flooding recover the oil.Therefore, to use which type of injecting liquid more effective safer be the important topic of field produces.Particularly water drive later stage and chemical flooding stage, the high efficiency that requires injecting liquid to have the displacement of reservoir oil has protection oil production equipment and reservoir geology safety, economical and practical characteristic again.
Water-drive oil recovery adopts mostly is underground water and river, because a large amount of water fillings, the existence of hardness ions and residual in the water brings very big harm to oil producing operation.And interfacial tension height between the profit, oil, water viscosity ratio is big, it is more and more higher with output liquid water ratio that water filling water mobility is difficult to control, later stage need exchange limited crude oil with a large amount of water fillings for, cause and inject invalid circulate of water between water injection well and recovery well, seriously reduced water-drive oil recovery efficient.Make oil producing operation have to enter the expensive chemical flooding stage in advance.
The polymkeric substance that chemical flooding adopts also is the viscosity of simple raising injecting liquid, by reducing the mobility control that differences in viscosity between oil, water realizes water.But it can not change the character of the interface relation between oil, water, so the oil recovery ability is still limited, can only drive flowable that part crude oil in the oil reservoir, can not start to stick to not runny in a large number oil in the blowhole.And polymer residue is in the oil reservoir rock core, owing to the effect that is stressed for a long time with temperature can bring hidden danger to oil reservoir geology.To using the output oil of polymkeric substance, need carry out numerous and diverse demulsification technology simultaneously.And the residual meeting of polymkeric substance causes the coking problem in the oil following process process, influences the normal operation of oil processing equipment.
When the oil field enters the later stage of recovering the oil, need introduce the cosurfactant of the synthetic that costs an arm and a leg in order to keep production, to change the physical property between oil, water, reduce oil, water termination tension force, extraction sticks to rock surface and is adsorbed on that part of not runny oil in the rock core pore throat.But cosurfactant can not improve the viscometric properties of injecting liquid, can not reach the best mobility ratio of injecting liquid.So, often need same polymkeric substance/tensio-active agent/alkali preparation to form ternary composite displacement system, come the crude oil of the underground more and more difficult exploitation of extraction.Yet the introducing of alkali preparation in the ternary composite driving, particularly highly basic NaHO can make extraction equipment cause serious corrosion and fouling and the oil reservoir rock core is damaged.
The performance of existing displacement of reservoir oil synergistic agent is changed greatly by the influence of ambient conditions, particularly because the existence of divalence hardness ions in fluid and the oil reservoir rock core, consumes that intellectual is very not big, can accurately not hold and bring into play its effect.Along with the progress consumption chemicals of oil producing operation is more and more, cost for oil production continues to increase, and is difficult to economically bear.Therefore, need a kind of not only had inhibition, scale effect but also can the brand-new displacement of reservoir oil synergistic agent of displacement of reservoir oil synergic.
SJT-B displacement of reservoir oil synergistic agent (hereinafter to be referred as the SJT-B preparation) is exactly the real needs according to oil producing operation, utilizes the special property of inorganic salt to develop.Prove by test the every index of SJT-B preparation; it has inhibition, scale inhibition; improve plant efficiency, protection oil reservoir rock core, reduce oil water interfacial tension raising recovery ratio; existing displacement of reservoir oil synergistic agent is maximized favourable factors and minimized unfavourable ones, improve the utilization ratio of chemical oil displacement agent, a kind of brand-new chemicals that reduces cost.
The SJT-B preparation can be formed slug separately under the prerequisite that does not change original oil producing operation flow process, also can constitute jointly slug with other displacement of reservoir oil synergistic agent and use.Can implement according to oil field operation actual design preferred plan.
The SJT-B preparation belongs to inorganic salt, meets the environment that crude oil generates and exists, and its introducing can not bring hidden danger can realize the optimum process of oil producing operation to the oil reservoir core.It is efficient, economic, safe, practical novel oil production synergistic agent.
Summary of the invention:
The SJT-B preparation is to change the original stable molecular structure of inorganic salt by the special technique means, introduce the monovalent base metallic cation of q.s, for the divalent metal (divalent metal is an objectionable impurities) that has removed stabilization ' the bridging oxygen key ' of the nonmetal oxide in the inorganic salt molecule become ' non-bridging oxygen key ' in oil recovery, original stable molecular structure is become metastability.Make this ' modification ' inorganic salt at normal temperatures for solid-state, in water, be subjected to the effect of water molecules and dissolved lentamente.Form the aqueous solution of monovalent base metallic cation and nonmetal acid group anion radical coexistence.Monovalent base potassium metal in the inorganic salt component, sodium ion (K like this
+, Na
+With the silicic acid, (SiO of phosphate radical anion group
3-, PO
4-) aqueous solution of plasma coexistence, this has just formed the matrix of SJT-B displacement of reservoir oil booster system.Shown in accompanying drawing 1 SJT-B displacement of reservoir oil synergistic agent molecular network structure iron.
Network hole ion Na in this special inorganic salt molecular structure
+, K
+In water, be easy to be subjected to the effect disengaging ink cell of water molecules and be free in the aqueous solution.The original molecule structure is disintegrated simultaneously, and the nonmetal acid group anion radical in its molecular structure also is free in the water, forms SJT-B displacement of reservoir oil synergistic agent mother liquor.
In the mother liquor of water molecules dissolved SJT-B preparation, introduce an amount of active factor and make SiO in the mother liquor
3 2-, PO
4 3-Molecular structure morph, form the aqueous solution have sp act and to have the nano level SJT-B preparation of negative electrovalent nano silicone phosphate radical anion chain, alkali metal cation coexistence.
Its main chemical is as follows: unit: mg/L
| K ++Na + | SiO 3 2- | PO 4 3- | CO 3 2- | HCO 3 - | SO 4 2- | Other element |
| 1400～1900 | 3500～5000 | 2500～2800 | 350～450 | 500～550 | 150～220 | 1500～1800 |
Shown in accompanying drawing 2 SJT-B displacement of reservoir oil synergistic agent aqueous solution molecular structures.
SJT-B displacement of reservoir oil synergistic agent has following characteristic:
One, the inhibition of SJT-B preparation, antiscale, displacement of reservoir oil synergy mechanism
(1) because the interfacial tension of the silicon phosphate radical anion chain self that makes a variation in the SJT-B preparation is low, and has a good wetting property, overcome since the interfacial tension of water to the phenomenon of blockading of low permeability layer rock core pore throat introducing port, make injecting liquid can flow into the low permeability layer rock core smoothly, and the Oil extraction that remains in the low permeability layer rock core is come out.Shown in accompanying drawing 3 SJT-B displacement of reservoir oil synergistic agent displacement of reservoir oil profile control mechanism synoptic diagram.
(2) nano silicone phosphoric acid salt colloidal particle in the SJT-B preparation is fine oleophylic matrix.When injecting liquid is flowed through the oil reservoir rock core, can be attached on free rock core neutralization the remnants absorption of core surface and stick and wrap up in, improve recovery ratio without emulsification.Take shown in the oily mechanism synoptic diagram as accompanying drawing 4 SJT-B displacement of reservoir oil synergistic agent oleophylics.
(3) have the electrostatic attraction effect of bearing electrovalent silicon phosphate radical anion chain in the SJT-B preparation, the divalence hardness ions is had extremely strong avidity, when in fluid, meeting Ca
2+, Mg
2+During hardness ions, make the ion chain take place to curl, form this colloidal particle of ' nano silicone phosphoric acid salt colloidal particle ' (with regard to the virus in the blood of eating as white cell) and can flow with fluid, thereby stop Ca
2+Mg
2+Hardness ions forms foulant in fluid.Remove shown in the hard antiscale mechanism synoptic diagram as accompanying drawing 5 SJT-B displacement of reservoir oil synergistic agent.
(4) between colloidal particle certain avidity and characteristic of concentration are arranged in the SJT-B preparation, it can be dispersed in the fluid and also can accumulate in together.Particularly by long-term injecting water and chemical flooding process, when ' the silicate colloid particle ' that form in the fluid when reaching a certain amount of, gathering of it can stop most permeable zone fluidic flow, and plays ' profile control ' effect.Defend shown in the synoptic diagram as accompanying drawing 3 SJT-B displacement of reservoir oil synergistic agent displacement of reservoir oil profile control mechanism.
(5) have negative electricity valency ' silicon phosphate radical anion chain ' in the SJT-B preparation; when flowing through injection device and extraction equipment; can form half embedding formula ' nanoscale molecular protective membrane ' in equipment surface, the deposition of oxidized corrosion of the equipment that prevents and hardness ions foulant and reach the effect of inhibition, scale inhibition.Shown in accompanying drawing 6 SJT-B displacement of reservoir oil synergistic agent corrosion-mitigation scale-inhibition mechanism synoptic diagram.
In the chemical flooding process, alkali electroless agent, polymkeric substance and tensio-active agent all are the main compositions that injects liquid.Entering the oil producing operation in later stage in the oil field, use this ternary composite driving, has been efficient ways by the practical proof that recovers the oil both at home and abroad.But alkali preparation is introduced and need be treated cautiously, because it can cause the corrosion and the scale problems of extraction equipment in the displacement of reservoir oil.And the SJT-B preparation can solve inhibition, antiscale problem fully when improving recovery ratio.
Two, the SJT-B preparation has satisfactory stability, compatibility and inhibition, antiscale, displacement of reservoir oil synergic over-all properties
With the strong base ternary composite driving is experimental basis, system performance, inhibition, anti-scaling property and the displacement of reservoir oil synergy ability of SJT-B preparation has been carried out the indoor evaluation experimental of system.The result is as follows:
(1) SJT-B preparation and compound system have excellent compatibility
The polymkeric substance that experiment is used divides polymkeric substance as superelevation, and with oil recovery factory's clear water preparation 5000mg/L mother liquor, the back is diluted to 1200mg/L with deeply treating wastewater, and the interfacial tension that adding weak base, highly basic tensio-active agent and SJT-B preparation carry out compound system detects.
The interfacial tension cartogram of SJT-B preparation and ternary built system
| Project | Weak base tensio-active agent 0.1% (* 10-3mN/m) | Weak base tensio-active agent 0.3% (* 10-3mN/m) | Highly basic tensio-active agent 0.1% (* 10-3mN/m) | Highly basic tensio-active agent 0.3% (* 10-3mN/m) | ||||
| 1.2％Na 2CO 3 | 1.2％Na 2CO 3 | 1.2％NaOH | 1.2％NaOH | |||||
| No SJT-B | 4.17 | 2.34 | 7.78 | 8.58 | ||||
| 0.4％SJT-B | 1.28 | 7.37 | 3.48 | 1.44 | 5.50 | 7.57 | 1.64 | 4.42 |
| 1.2％SJT-B | 3.89 | ～ | 6.66 | ～ | 3.46 | ～ | 5.47 | ～ |
Experimental result proves: SJT-B preparation and three-component compound system have the excellent compatibility energy.And in ternary, introduce its interfacial tension value of SJT-B preparation and obviously reduce.
(2) the SJT-B preparation has the interfacial activity of broad.
Experiment divides polymkeric substance with the superelevation of clear water preparation dilution of sewage, highly basic tensio-active agent, the interfacial activity of detection SJT-B preparation three-component compound system.
The interfacial activity data sheet of SJT-B preparation and highly basic surfactant compound system
Shown in accompanying drawing 7 SJT-B displacement of reservoir oil synergistic agent ternary system interfacial activity figure.
Experimental result proves: SJT-B preparation concentration in three-component compound system is 0.6%～1.2%, and surfactant concentration is in 0.1%～0.3% scope, and interfacial activity is better.
(3) the SJT-B preparation has stable alkali-resistivity
Composite SJT-B preparation and highly basic NaOH, detect the variation of interfacial tension and determine its alkali-resistivity.
Experimental result is as follows
SJT-B preparation and highly basic NaOH compound system interfacial tension cartogram
| Sequence number | NaOH(％) | SJT-B(％) | Viscosity (mPa.s) | Interfacial tension (mN/m) |
| 1 | 1.2 | 0.0 | 22.5 | 7.54E-03 |
| 2 | 1.0 | 0.2 | 26.2 | 1.41E-02 |
| 3 | 0.8 | 0.4 | 25.8 | 1.57E-02 |
| 4 | 0.6 | 0.6 | 26.4 | 4.03E-02 |
| 5 | 0.4 | 0.8 | 28.2 | 1.11E-02 |
| 6 | 0.2 | 1.0 | 28.1 | 9.11E-03 |
| 7 | 0.0 | 1.3 | 29.8 | 3.93E-03 |
| 8 | 0.0 | 0.8 | 22.5 | 1.06E-03 |
| Tensio-active agent is the agent alive of highly basic table, and polymkeric substance is that northeast refinery superelevation is divided polymkeric substance (concentration is 1200mg/L), and oil is dewatered oil | ||||
Shown in accompanying drawing 8 SJT-B displacement of reservoir oil synergistic agent ternary system alkali resistants are marked on a map.
Experimental result proves: with highly basic composite after, with the reduction of SJT-B formulation concentrations rising NaHO concentration, the viscosity of compound system is elevated to 29.8mPa.s by 22.5mPa.s, the system interfacial tension drops to 3.93E-03.And use SJT-B preparation interfacial tension value to be lower than the interfacial tension that adds NaHO separately.It can substitute highly basic, thereby avoids the corrosion that highly basic brings to oil production equipment and the injury problem of fouling and oil reservoir rock core.
(4) the SJT-B preparation has good salt resistance
In NaCL concentration was 1000mg/L～8000mg/L scope, the interfacial tension value of test three-component compound system was to check its salt resistance respectively in experiment.
Scheme 1:0.3% highly basic tensio-active agent (oil recovery factory, PetroChina Company Limited. northeast now uses)+1.2%NaOH+1200mg/L superelevation is divided polymkeric substance+0.4%SJT-B preparation.
Scheme 2:0.3% highly basic tensio-active agent (oil recovery factory now uses)+1200mg/L superelevation is divided polymkeric substance+0.4%SJT-B preparation.
SJT-B preparation salt resistance data statistic
| Interventions Requested | Scheme | NaCL concentration (mg/L) | |||||||
| 1000 | 2000 | 3000 | 4000 | 5000 | 6000 | 7000 | 8000 | ||
| Interfacial tension (mN/m) | 1 | 4.62E-02 | 3.74E-02 | 3.62E-02 | 1.95E-02 | 6.45E-02 | 3.53E-02 | 3.79E-02 | 8.50E-02 |
| 2 | 1.61E-02 | 4.99E-03 | 1.47E-02 | 8.36E-03 | 2.61E-03 | 3.72E-03 | 1.26E-02 | 6.81E-03 | |
Shown in the anti-salt of accompanying drawing 9 SJT-B displacement of reservoir oil synergistic agent ternary systems is marked on a map.
Experimental result proves: increase with NaCI concentration, the interfacial tension value of compound system changes little, illustrates that the said preparation salt resistance conforms to requirement.And interfacial tension obviously reduces when getting for highly basic NaHO with the SJT-B preparation in ternary, and anti-salt property is stronger.
(5) the SJT-B preparation has anti-hard water
Surpass 50mg/L with calcic, magnesium ion, sewage carry out the detection of SJT-B preparation compound system interfacial tension.
The anti-performance of hard water data statistic of SJT-B preparation
Experimental result proves: the anti-performance of hard water of SJT-B preparation is good, and its interfacial tension value changes little, and under getting for the alkaline situation better effects if.
(6) the SJT-B preparation has inhibition, anti-scaling action
The specific function of SJT-B preparation is: solve and be stranded the corrosion and the scale problems of scratching ternary composite driving extraction equipment always.Adopt the professional detection method that detects the inhibiter scale inhibitor, the SJT-B preparation has been carried out inhibition, anti-scaling property detection.
Result such as following table:
SJT-B preparation and Na
2CO
3Anticorrosion-antiscaling effect comparative statistics table
| Project | Detect index | SLT-B preparation 0.4% | Na 2CO 31.2％ | |
| The 1# sample | The 2# sample | |||
| Outward appearance | Uniform liquid | Uniform liquid | Uniform liquid | Uniform liquid |
| Water-soluble | Dissolving | Dissolving | Dissolving | Dissolving |
| Solid content (m/m) % | 〉=registration content | 16.77 | 19.11 | 95.14 |
| Corrosion inhibition rate (%) | ≥20 | 61.82 | 64.11 | 4.30 |
| Antiscaling rate (%) | ≥80 | 92.00 | 92.02 | 0.00 |
Experimental result proves: the SJT-B preparation has inhibition, the anti-scaling action of inhibiter, scale inhibitor.Its introducing can solve chemical flooding particularly the equipment corrosion that exists of strong base ternary composite driving and fouling to topic
(7) the SJT-B preparation can improve recovery ratio
1, the SJT-B preparation improves recovery ratio in water-drive oil recovery
By to low-permeability oil deposit stop up the inner evaluation oil displacement experiment, the SJT-B preparation is better than waterflooding effect, recovery ratio improves a lot.The result is as follows;
Oil displacement efficiency experimental data table
| Scheme | Core permeability (* 10 3μm) | Water drive is to (%) | Oil saturation (%) | SJT-B concentration (%) | Recovery ratio | ||
| Water drive | The follow-up water of SJT-B+ | Increase | |||||
| 1(SJT-B 0.4％) | 254.4 | 98 | 71.69 | 0.4 | 26.72 | 31.90 | 5.18 |
| 2(SJT-B 0.4％) | 405.1 | 70 | 74.40 | 0.4 | 22.03 | 33.56 | 11.35 |
| 3(SJT-B 0.2％) | 91.0 | 70 | 62.17 | 0.2 | 29.17 | 36.67 | 7.50 |
| 4(SJT-B 0.05％) | 455.0 | 70 | 68.96 | 0.05 | 25.00 | 32.69 | 7.69 |
Experimental result proves: water drive was introduced the SJT-B preparation recovery ratio is greatly improved by moisture 70～90% o'clock.Even concentration is that recovery ratio also can improve more than 7 percentage points under 0.05% condition, and along with the concentration of SJT-B preparation increases recovery ratio amplification more greatly.The subject range that the SJT-B preparation is described is very wide.So it can prolong the water drive production cycle, postpone entering too early of expensive chemical flooding, the SJT-B preparation is a kind of reduction cost for oil production, improves the novel displacement of reservoir oil synergistic agent of recovery ratio.
We are with oil field, northeast grape flower formation core, and carrying out SJT-B preparation and water drive, to have carried out contrast and experiment as follows:
SJT-B preparation and water drive rock core displacement cartogram
| Project | Time (branch) | Pressure (atm) | Produce water (mI) | Accumulative total (mI) | Produce oil (mI) | Accumulative total (mI) | Inject volume (mI) | Water ratio (%) | Recovery ratio (%) | Rate of permeation (md) |
| Water filling | 0 | 3.62 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | ～ |
| 2 | 3.62 | 0.00 | 0.00 | 0.63 | 0.63 | 0.11 | 0.00 | 10.66 | 84.12 | |
| 5 | 3.69 | 0.25 | 0.25 | 0.68 | 1.31 | 0.26 | 26.88 | 22.17 | 91.97 | |
| 10 | 3.82 | 0.63 | 0.88 | 0.85 | 2.16 | 0.51 | 42.57 | 36.55 | 113.64 | |
| 15 | 3.85 | 0.89 | 1.77 | 0.58 | 2.74 | 0.76 | 60.54 | 46.36 | 112.58 | |
| 20 | 3.86 | 1.23 | 3.00 | 0.32 | 3.06 | 1.03 | 79.35 | 51.78 | 119.95 | |
| Annotate the SJT-B preparation | 0 | 3.82 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | ～ |
| 2 | 3.82 | 0.00 | 0.00 | 1.35 | 1.35 | 0.25 | 0.00 | 24.91 | 83.35 | |
| 8 | 3.99 | 0.22 | 0.22 | 1.12 | 2.47 | 0.50 | 16.42 | 49.79 | 124.73 | |
| 12 | 3.97 | 0.35 | 0.57 | 0.63 | 3.10 | 0.68 | 35.71 | 52.45 | 87.90 | |
| 16 | 4.12 | 0.62 | 1.19 | 0.52 | 3.62 | 0.89 | 54.39 | 61.25 | 98.89 | |
| 20 | 4.26 | 0.96 | 2.15 | 0.38 | 4.00 | 1.13 | 71.64 | 67.68 | 91.06 | |
| Increased value | -0.85 | +0.94 | -7.71 | +15.90 |
Experiment confirm: the oil displacement efficiency of SJT-B preparation, calculate recovery ratio by 1PV and be significantly improved than water drive, increase rate reaches as high as 15.9% more than 15%.Water injection rate obviously reduces, and petroleum production obviously increases, and water-free recovery factor is very high, and oil recovery rate improves also very big.So it is very favourable introducing the SJT-B preparation in water drive, particularly the maturing field to the water drive later stage has more practical significance
2, the SJT-B preparation improves recovery ratio in chemical flooding.
The injection liquid of the ternary composite driving that provides with oil recovery factory, northeast experiment group, the cooperation of having carried out the SJT-B preparation are with contrast and substitute and test.Polymkeric substance is that superelevation is divided polymkeric substance, and with clear water preparation 5000mg/L mother liquor, the back is diluted to 1200mg/L with deeply treating wastewater, adds tensio-active agent and SJT-B preparation and carries out chemical displacement of reservoir oil experiment.Slug size 0.5PV, the artificial core of heterogeneous body (most permeable zone: 1200md, middle pervious course: 600md, low permeability layer: 200md)
: the ternary composite oil-displacing experimental result
| The scheme numbering | The scheme content | Viscosity mPa.s | Oil-containing degree of being full of % | The jail (%) of gathering | Increased value (%) | Remarks | ||
| Water drive | Chemical flooding | Relative water drive | Poly-relatively driving | |||||
| 1 | Water drive 90%+P+S4#+SJT-B+NaOH | 25.5 | 74.8 | 29.2 | 69.7 | 34.5 | 9.8 | Emulsification |
| 2 | Water drive 90%+P+S4#+SJT-B (0.4%) | 36.8 | 74.1 | 29.6 | 54.2 | 19.0 | 5.9 | |
| 3 | Water drive 90%+P+S4#+NaOH | 27.5 | 74.1 | 29.4 | 62.2 | 32.8 | 12.3 | Emulsification |
| 4 | Water drive 90%+P+S1#+SJT-B (0.4%) | 54.5 | 75.3 | 31.8 | 67.7 | 32.5 | 7.8 | Emulsification |
| 5 | Water drive 90%+P+S1#+Na 2CO 3(0.2％) | 50.0 | 74.5 | 31.7 | 65.6 | 30.4 | 5.7 | |
| 6 | Water drive 90%+P+S1#+Na 2CO 3(1.2％) | 27.0 | 74.2 | 31.9 | 63.3 | 28.1 | 12.8 | Emulsification |
| 7 | Water drive 90%+P+S2#+SJT-B | 53.5 | 74.8 | 32.9 | 66.8 | 31.6 | 6.9 | Emulsification |
| 8 | Water drive 90%+P+S2#+Na 2CO 3 | 42.0 | 76.6 | 33.5 | 74.4 | 39.2 | 14.5 | |
| 9 | Water drive 90%+P+S2#+Na 2CO 3 | 33.5 | 75.4 | 32.9 | 70.5 | 35.3 | 10.6 | Emulsification |
| 12 | Water drive 90%+P+S1#+NaCl | 22.0 | 76.1 | 30.7 | 63.5 | 28.3 | 3.6 | |
| 13 | Water drive 90%+P+S2#+NaCl | 24.0 | 75.5 | 33.7 | 73.0 | 37.8 | 13.1 | |
| Mend | Water drive 90%+P+S4#+SJT-B (1.2%) | 36.5 | 74.5 | 33.0 | 75.9 | 40.7 | 16.0 | |
| Mend flat | Water drive 90%+P+S4#+SJT-B (1.2%) | 35.6 | 75.0 | 32.5 | 74.8 | 39.6 | 14.9 | |
| Mend 1 | Water drive 90%+P+S4#+SJT-B (0.8%) | 39.5 | 75.8 | 32.6 | 72.4 | 37.2 | 12.5 | Back emulsifying water |
| Mend 2 | Water drive 90%+SJT-B (0.4%) | ～ | 75.9 | 30.2 | 42.9 | 7.7 | -17.0 | Back emulsifying water |
| Mend 3 | Water drive 70%+SJT-B (0.4%) | ～ | 75.6 | 27.9 | 44.0 | 8.8 | -15.9 | |
| 14 | Water drive 90%+P | 47.0 | 75.5 | 32.7 | 59.9 | 24.7 | ～ | |
| 15 | Water drive 98% | ～ | 75.0 | 35.2 | ～ | ～ | ～ | |
Experimental results show that:
1. in the ternary composite driving, the SJT-B preparation is favourable to improving recovery ratio in the inhibition antiscale.It can play the effect same with former ternary composite driving, the SJT-B preparation is added in the former ternary composite driving can improve former recovery ratio; The concentration that increases SJT-B can reach the oil displacement efficiency that drives again above strong base ternary.
2. mend 2, mend 3 scheme contrast experiments and confirm: the SJT-B preparation uses more early that to increase the recovery ratio amplitude bigger, to the optimum exploitation of oil reservoir rock core and oil production equipment better.
(8) the SJT-B preparation does not have injury to the oil reservoir rock core
Test by resistance coefficient and residual resistance factor that detection SJT-B preparation ternary complex ties up in the heterogeneous core, check it whether the oil reservoir rock core is had injury.
The result is as follows:
Resistance coefficient and residual resistance factor test result
| Scheme | The scheme content | Rate of permeation * 10 -3μ m 2 | Resistance coefficient | Residual resistance factor | Scheme | The scheme content | Rate of permeation * 10 -3μm 2 | Resistance coefficient | Residual resistance factor |
| 1 | Water drive 90%+P+(0.3%) highly basic table agent+(0.4%) SJT-B+(1.2%) NaOH | 1125 (height) | 27.3 | .19.3 | 6 | Water drive 90%+P+(0.3%) alkali-free table agent alive+(1.2%) Na 2CO 3( | 1126 (height) | 23.1 | 5.9 |
| 746 (in) | 37.1 | 20.9 | 709 (in) | 24.2 | 20.5 | ||||
| 291 (low) | 69.6 | 61.6 | 252 (low) | 75.5 | 26.3 | ||||
| 2 | Water drive 90%+P+(0.3%) highly basic table agent+SJT-B (0.4%) alive | 1347 (height) | 18.7 | 3.7 | 12 | Water drive 90%+P+(0.3%) alkali-free table agent+NaCl alive | 1395 (height) | 25.3 | 14.2 |
| 755 (in) | 23.1 | 5.6 | 691 (in) | 29.7 | 16.2 | ||||
| 248 (low) | 69.8 | 9.5 | 237 (low) | 61.7 | 20.2 | ||||
| 3 | Water drive 90%+P+(0.3%) highly basic table agent alive+(1.2%0) NaOH | 1194 (height) | 19.7 | 4.6 | 13 | Water drive 90%+(0.3%) weak base table agent+NaCl alive | 1126 (height) | 23.1 | 5.9 |
| 764 (in) | 21.3 | 6.8 | 709 (in) | 24.2 | 20.5 | ||||
| 224 (low) | 66.4 | 18.9 | 252 (low) | 75.5 | 26.3 | ||||
| 4 | Water drive 90%+P+(03%) alkali-free table agent alive+(0.4%) SJT-B | 1085 (height) | 16.2 | 4.8 | Mend | Water drive 90%+P+(0.3%) highly basic table agent+SJT-B (1.2%) alive | 1107 (height) | 67.4 | 41.7 |
| 795 (in) | 18.1 | 4.9 | 795 (in) | 76.9 | 48.5 | ||||
| 306 (low) | 70.4 | 10.3 | 231 (low) | 96.3 | 69.9 | ||||
| 5 | Water drive 90%+P+(0.3%) alkali-free table agent alive+(0.2%) Na 2CO 3) | 1123 (height) | 22.2 | 7.2 | 14 | Water drive 90%+P | 1120 (height) | 15.9 | 3.5 |
| 734 (in) | 25.1 | 9.0 | 746 (in) | 17.6 | 4.2 | ||||
| 317 (low) | 45.1 | 12.7 | 287 (low) | 33.5 | 7.8 |
Experimental results show that:
1. the SJT-B preparation does not have injury to the oil reservoir rock core, and resistance coefficient and residual resistance factor value in heterogeneous core do not occur unusual.Can overcome the difficult problem that other chemicals damages rock core.This is because the SJT-B preparation belongs to the inorganic salt preparation, it conforms to the objective condition that oil forms and exists, thereby it is safe.
2. survey rate of permeation at rock core water and be respectively 200 * 10
-3μ m
2 μ, 700 * 10
-3μ m
2, 1200 * 10
-3μ m
2Condition under add the SJT-B formulation concentrations when low, its resistance coefficient and residual resistance factor are less, increase resistance coefficient and residual resistance factor increase with concentration when the SJT-B formulation concentrations surpasses finite concentration.When the concentration of SJT-B preparation resistance coefficient and residual resistance factor up to 1.2% time reach maximum, and recovery ratio is also maximum.
3. the ternary system of SJT-B preparation composition compares Na
2CO
3And NaHCO
3Resistance coefficient, the residual resistance factor of ternary system in low permeability layer all low, illustrate that SJT-B preparation ternary system is favourable to the circulation of the injecting liquid of low permeability layer.
4. from resistance coefficient and residual resistance factor data as can be seen, the nano level colloidal particle of SJT-B preparation has better profile control effect, also is not improved largely even do not produce the emulsion recovery ratio.Can aspect the processing of extraction liquid, save the input of uphole equipment and chemical assistant like this.
5. scheme 1 contrasts with scheme 2 resistance coefficients and residual resistance factor, and the introducing of SJT-B preparation can overcome the injury that highly basic brings to rock core as can be seen.Residual resistance factor particularly, the SJT-B preparation is more much smaller than highly basic, and this provides for crude oil of exploitation low permeability layer may.
Three, SJT-B preparation rig-site utilization reference
(1) uses in the water drive later stage, by the wetting property of SJT-B preparation self and low oil water interfacial tension, particularly to oil reservoir pore texture serious heterogeneity, be not suitable for carrying out the oil field of polymer flooding, utilizing the profile control of this preparation to be used for improving recovery ratio is a good selection.
(2) to preparing to use polymer flooding, the oil field of adopting the big slug displacement of high density scheme is used SJT-B/ polymkeric substance binary combination flooding method and is formed different slug combinations, makes more science, more reasonable, more economical of displacement scheme.
Polymer flooding to the big slug of high density is to increase substantially recovery ratio in short duration, but this displacement of reservoir oil mode certainly will need a large amount of polymkeric substance inputs to strengthen cost for oil production, the full-bodied polymer slug of simultaneously big slug is in inhomogeneous oil reservoir, can only exploit out the irreducible oil in most permeable zone duct, and may produce the shutoff phenomenon to low permeability layer, the irreducible oil in the low permeability layer can't be exploited.In view of the above, the short slug polymer flooding of high density, the SJT-B slug of follow-up 0.4% concentration are adopted in suggestion, form binary combination flooding and annotate mode, can effectively occupy most permeable zone by the polymer slug of high density like this, make low viscous SJT-B preparation enter low permeability layer, play the profile control effect.
(3) to because of reservoir geology salinity height; the particularly influence of hardness ions; can not use and can not economic oil field of using cosurfactant; can use the SJT-B preparation to protect tensio-active agent not consumed effectively, form SJT-B preparation/cosurfactant binary combination flooding for scheme by hardness ions.
(4) to maturing field after carrying out the binary combination flooding that above-mentioned SJT-B preparation/polymer flooding, SJT-B preparation/cosurfactant drive, still residual a certain amount of minable crude oil.Can use the method for SJT-B preparation/polymkeric substance/cosurfactant ternary composite driving for this reason, the exploitation as much as possible of underground crude oil is come out.
(5) to adopting the sixth of the twelve Earthly Branches ternary composite driving particularly to adopt the oil field of strong base ternary composite driving; adopt the three-component compound system of SJT-B preparation can solve highly basic to the corrosion of extraction equipment and fouling and to the hard nut to crack of oil reservoir core damage; realize the optimum process of oil producing operation protective development, improve recovery ratio.
Description of drawings:
One accompanying drawing, 1 SJT-B displacement of reservoir oil synergistic agent molecular network structure iron.
Two accompanying drawings, 2 SJT-B displacement of reservoir oil synergistic agent aqueous solution molecular structures.
Three accompanying drawings, 3 SJT-B displacement of reservoir oil synergistic agent displacement of reservoir oil profile control mechanism synoptic diagram.
Four accompanying drawings, 4 SJT-B displacement of reservoir oil synergistic agent oleophylics are taken oily mechanism synoptic diagram.
Five accompanying drawings, 5 SJT-B displacement of reservoir oil synergistic agent remove hard antiscale mechanism synoptic diagram.
Six accompanying drawings, 6 SJT-B displacement of reservoir oil synergistic agent corrosion-mitigation scale-inhibition mechanism synoptic diagram.
Seven accompanying drawings, 7 SJT-B displacement of reservoir oil synergistic agent ternary system interfacial activity figure.
Eight accompanying drawings, 8 SJT-B displacement of reservoir oil synergistic agent ternary system alkali resistants are marked on a map.
The anti-salt of nine accompanying drawings, 9 SJT-B displacement of reservoir oil synergistic agent ternary systems is marked on a map.
Claims (3)
1, Du Chuan chemical ingredients: this product is an inorganic salt compound petroleum chemistry preparation, and its aqueous solution is the SiO by certain salinity
3 2-, PO
4 3-, CO
3 2-, HCO
3 -, SO
4 2-, Na
+, K
+, and the nanometer grade inorganic salt colloidal particle formed of different kinds of ions such as aluminium borate, ammonium salt, sulfonate and rare earth element.
2, the Du Te mode of production: this product is by 1500 ℃ of high temperature a certain proportion of multiple alkalimetal oxide to be fused in the multiple nonmetal acid oxide compound, plurality of inorganic salt compound vitreous state eutectic through cooling off, being solidified to form, introduce a certain amount of active element through water dissolution, changed the molecular structure of inorganic salt, made it become the nano level inorganic salt colloidal particle aqueous solution.
3, Chuan Xin product function: this product has multi-functional displacement of reservoir oil synergism, it promptly has inhibition, anti-scaling function and can reduce interfacial tension again and improve the oil recovery recovery ratio, and it has that good compatibility can use separately and can be used with other displacement of reservoir oil chemical agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610016674 CN1982407A (en) | 2006-03-17 | 2006-03-17 | SJT-B-oil-displacing synergist |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610016674 CN1982407A (en) | 2006-03-17 | 2006-03-17 | SJT-B-oil-displacing synergist |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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Family
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|---|---|---|---|
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| Country | Link |
|---|---|
| CN (1) | CN1982407A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102604605A (en) * | 2012-02-07 | 2012-07-25 | 大庆鼎奥油田科技有限公司 | Inorganic salt dual fluid profile control agent and profile control method thereof |
| CN110374559A (en) * | 2018-04-10 | 2019-10-25 | 陈光凌 | The method and device that different displacement modes influence low medium-high permeable reservoir oil displacement efficiency |
-
2006
- 2006-03-17 CN CN 200610016674 patent/CN1982407A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102604605A (en) * | 2012-02-07 | 2012-07-25 | 大庆鼎奥油田科技有限公司 | Inorganic salt dual fluid profile control agent and profile control method thereof |
| CN102604605B (en) * | 2012-02-07 | 2013-07-31 | 大庆鼎奥油田科技有限公司 | Inorganic salt dual fluid profile control agent and profile control method thereof |
| CN110374559A (en) * | 2018-04-10 | 2019-10-25 | 陈光凌 | The method and device that different displacement modes influence low medium-high permeable reservoir oil displacement efficiency |
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