CN1088141C - Mixture to increase oil layer recovery - Google Patents
Mixture to increase oil layer recovery Download PDFInfo
- Publication number
- CN1088141C CN1088141C CN98801954A CN98801954A CN1088141C CN 1088141 C CN1088141 C CN 1088141C CN 98801954 A CN98801954 A CN 98801954A CN 98801954 A CN98801954 A CN 98801954A CN 1088141 C CN1088141 C CN 1088141C
- Authority
- CN
- China
- Prior art keywords
- mixture
- water
- gel
- methylcellulose
- gram
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Medicinal Preparation (AREA)
- Lubricants (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention is intended for use in the petroleum industry as a gelatinous agent during refining of the oil fields by means of flooding. The proposed mixture provides for increased recovery of the oil layers for a wide range of layer temperatures including the highest, by redistributing the filtration flows and increasing the conformance of the flooded layer. The basic components of the mixture are cellulose and water esters, whereby the cellulose esters are esters with a low critical dissolution point, used in addition to carbamide or thiocarbamide, or ammonium thiocyanate, or a mixture of these elements according to the following proportions (in molecular weight): ester with a low critical solution point (0.25 to 2.0); carbamide (2.0 to 20.0); thiocarbamide (0.5 to 2.0); ammonium thiocyanate (0.5 to 2.0); and water (the remainder). It is preferable to use methylcellulose or methyloxypropylcellulose as the cellulose esters with a low critical solution point.
Description
The present invention relates to oil exploitation industry and is used in to utilize in the oil field paneling in oil reservoir inject water to improve the oil reservoir oil recovery factor.
The prior art level
Known have a kind of mixture that improves the oil reservoir oil recovery factor, method is to utilize the mixture that contains water-soluble polymer and polyvalent metal salt to reduce the permeability [U.S. Patent No. 3762476 of pool high permeability zones, 3833061 and 4018286, international invention classification MK μ E21B43/24].Polymer forms gel by a plurality of cations and produces the stitching sealing function in oil reservoir.But formed gel is not near the oil reservoir zone that can successfully be injected into away from the work plane.This be since the gel formation time of mixture too short due to.Use this mixture to need higher expense.For improving the oil reservoir oil recovery factor, what technical spirit was nearest is a kind of mixture, and it contains water-soluble polymer methylcellulose and chloride-calcium type mineralized water [inventors certificate A.C.CCCP N681993, international invention classification MK μ E21B43/20, books and information δ μ 47,1991].Utilize in the oil mining area under the method oil recovery situation of water filling in oil reservoir, polymeric blends might improve the oil reservoir oil recovery factor, this is rely on to increase water filling to surround oil reservoir, and at this moment polymer has formed gel and can stop up oil reservoir with the closed height seepage in oil reservoir.Yet, the salt of having formed chloride-calcium type mineralized water mixture, can reduce and reduce the temperature and time that polymer (methylcellulose) solution forms gel greatly, this just may cause the mixture that injects oil reservoir on the volumetric usage only to oil reservoir near the workspace work, and do not have influence on some oil reservoirs than the territory, far field.In temperature is under the 70-90 ℃ of situation, and the time that the constituent of injection forms gel is 10-30 minute, is difficult to like this mixture is used for the high temperature oil reservoir.
Summary of the invention discloses
Main task of the present invention provides a kind of gellant combination, it can be in the reservoir temperature scope of broadness, under maximum temperature, improve the oil reservoir oil recovery factor, its method is to utilize some components that can increase gel formation time to increase oil reservoir in the mode of water filling to surround packing volume.
Being proposed of task is to solve like this, promptly improve the oil reservoir oil recovery factor mixture in contain cellulose esters and water, utilization has the ester class of low critical solution point as cellulose esters, and to wherein replenish adding urea or thiocarbamide or ammonium thiocyanate or their mixture, according to the following corresponding proportion (weight %) of each component:
The ester 0.25-2.0 of low critical solution point
Urea 2.0-20.0
Thiocarbamide 0.5-2.0
Ammonium thiocyanate 0.5-2.0
Water is its surplus
Only is to use methylcellulose or the methoxy-propyl cellulose ester as low critical solution point.Fill volume by means of the liquid stream redistribution that is filtered with water filling increase oil reservoir bag, might improve the oil reservoir oil recovery factor, this possibility is based on cellulose esters one aqueous systems with low critical solution point can form gel under reservoir temperature in the porous media of auxilliary oil-collecting.
Add urea, the influence of thiocarbamide and ammonium thiocyanate has denominator and the hydrophobic interaction and the hydrogen bond that can change in the cellulose esters aqueous solution is described.In the presence of these additives, changed the structure of water and water for solvation (solubilization) ability of cellulose esters, improved cellulose esters solubility at high temperature with this.
Methylcellulose or the concentration of methoxy-propyl cellulose in gel mixture are to be in the 0.25-2.0 weight % scope.Concentration is lower than the solution of 0.25 weight %, just forms the colloidal sol of low viscosity and low mechanical strength, and concentration be 0.25 and the solution of Geng Gao can form and have the viscoplasticity stabilizing gel.The solution that working concentration is higher than 2.0 weight % does not conform with technological requirement, because the initial viscosity of mixture is too high.
The concentration range of urea is 2.0-20.0 weight % in gel mixture.Under the lower concentration situation, can not obtain good effect, can not improve temperature and increase the time that gel forms because compare with methylcellulose; And under the higher concentration situation, can increase the time that reaches high-viscosity gel.
The concentration range of thiocarbamide and ammonium thiocyanate is 0.5-2.0 weight %.Under the lower concentration situation, can not obtain good effect, and it is unreasonable economically to increase concentration.
The accompanying drawing summary
Fig. 1 is the dependence of the gel formation time of 1% the methocel solution represented with curve under 60 ℃ of temperature, 70 ℃ and 90 ℃ of situations to urea concentration.
Fig. 2 is that the gel formation temperature of explanation 1% methocel solution is to the dependence (curve 1) of thiourea concentration with to the dependence (curve 2) of ammonium thiocyanate concentration.
Fig. 3 is an explanation urea to the influence of cellulose esters solution (curve 1 is used for methylcellulose, and curve 2 is used for the methoxy-propyl cellulose) and Sai Luoman century water (curve 3) gel formation temperature of recording in the Upper Cretaceous in fresh fresh water.
The redistribution and the oil after the various gels of injection form mixture of Fig. 4 and Fig. 5 explanation filtered fluid stream in the heterogeneity reservoir model of different infiltration (leakage) property replenish the situation that Xian goes out again.
The working of an invention scheme
The mensuration of the gel formation temperature of rheological properties research method and gel mixture is to use the vibration viscometer that has tuning fork sensor and thermostat to carry out, and detailed method is as follows:
In the cell of a maintenance constant temperature, put into 50 milliliters the mixture that will study.The probe of one tuning fork sensor inserted solution and put into the thermostat of 1.2 ℃/minute of firing rates.When heating, viscosity number is noted from 20 ℃ to 90-95 ℃.
With distilled water as the calibration liquid.When heating, the viscosity of solution is reduced to 1.7-33.6 milli handkerchief second from 7.3-104 milli handkerchief second (mPas) gradually, make viscosity increase to 172-745 milli handkerchief second owing to having generated gel subsequently, this viscosity increases and forms relevantly with gel, is the feature of hanging down the critical solution point cellulose esters aqueous solution.This mixture is noted 20 ℃ viscosity, then the MV minium viscosity of solution and the viscosity of formation gel are also noted.
The rheological properties of gel formation, the result of study of temperature and time are shown in the table.
Form the result of study of mixture according to gel, the validity of the mixture that the present invention is proposed has been done evaluation, evaluation is to carry out in a filtration studies device by the heterogeneity reservoir model, and reservoir model is formed (each king-post all has common inlet and the outlet that separates) by two the parallel cylindrical towers (king-post) with different infiltration (leakage) degree.Use penetration range to be the 2.229-4.676 micron
2(mcm
2) the loose Mathematical Model of heaped-up of oil reservoir, these models are to be made by the rock core material that the chippy probing that is full of oil is taken out.The preparation of oil and rock core material is to carry out according to oil sector institute accepted standard method.Begin from two king-posts with squeezing oil, reach 100% the water that is full of up to the sample that obtains.In squeezing the process of oil, measure the volume of two king-post entrance and the pressure and temp in exit, the oil that from each king-post, squeezes and water by certain time interval.According to the flowability or the mobility K/ μ of the various liquid of data computation that obtain, micron
2/ (milli handkerchief second), K is the permeability of liquid model in the formula, and μ is the viscosity of liquid and the excretion coefficient K that oil is squeezed out by water
B, %.After oil is squeezed out by water, in two king-posts, inject the batching that gel forms mixture simultaneously, water is pushed to certain distance, keeps the constant temperature certain hour so that form gel in reservoir temperature.
Then, continue to be pressed into water and through temperature, the pressure of measuring each king-post entrance and exit place behind the certain hour, squeeze the oil that and the volume of water.The absolute excretion coefficient that is squeezed out by gel mixture and water according to the degree of mobilization of this data computation liquid or mobility and oil.
Compare with the king-post of height infiltration, in the king-post of hyposmosis, injected more a spot of gel mixture.In reservoir model, injecting after gel forms mixture and form gel, the distribution again that has produced filtered fluid stream, this distribution again followed oil to replenish to extrude and taken place.
Enumerate the example of following gel mixture
Embodiment 1 (according to prototype)
Join in 240.0 gram heat (60-90 ℃) fresh fresh water 10.0 gram methylcellulose and careful the mixing.In the suspension that obtains, add the fresh cold water of 250.0 grams, and stirred 1-2 hour,, add 500.0 gram model oil-reservoir waters then and (consist of: the NaCl217.5 grams per liter until obtaining uniform solution; CaCl
220.0 grams per liter; MgCl
210.0 grams per liter).Resulting gel mixture contains the methylcellulose of 1.0 weight % in the water of salinity 65.0 grams per liters.The temperature and time that gel forms, the viscosity of the viscosity number of the mixture that makes, the MV minium viscosity of mixture and gel is shown in (position preface N1) in the table.
Embodiment 2 (according to prototype)
Utilize the model mixture (to consist of: NaCl 91.1 grams per liters as mineralized water; CaCl
230.2 grams per liter; MgCl
28.7 grams per liter).Result of study is shown in (position preface N2) in the table.
With 10.0 gram methylcellulose, 200.0 gram urea join in the hot fresh water of 100.0 grams, adding the 190.0 fresh cold water of gram after the stirring and stir until obtaining uniform solution in the suspension that obtains.The injection water model that adds 500.0 gram embodiment 2 then.Resulting gel mixture contains the methylcellulose of 1.0 weight % and the urea of 20.0 weight % is in the water of 65.0 grams per liters in salinity.Result of study is shown in (position preface N3) in the table.
With 10.0 gram methylcellulose, 200.0 gram urea join in the hot fresh water of 100.0 grams, adding the 190.0 fresh cold water of gram after the stirring and carefully stir until obtaining uniform solution in the suspension that obtains.Adding 500.0 gram model Upper Cretaceous discipline water then (consists of: NaCl 13.7 grams per liters, CaCl
21.3 grams per liter, MgCl
20.39 grams per liter, KHCO
30.27 grams per liter).Resulting gel forms mixture and contains 1.0 weight % methylcellulose, and the urea of 20.0 weight % is in the water of salinity 7.8 grams per liters.The temperature and time that gel forms, the viscosity number of prepared mixture, the MV minium viscosity of mixture and the viscosity of gel are shown in (position preface N4) in the table.
With 10.0 gram methylcellulose, the thiocarbamide of 50.0 gram urea and 10 grams joins in the hot fresh water of 2000.0 grams, is adding the 230.0 fresh cold water of gram after the stirring and carefully mix until obtaining uniform solution in the suspension that obtains.Add the water model that 500.0 grams will inject then, it consists of: NaCl 74.0 grams per liters, CaCl
227.9 grams per liter, MgCl
28.1 grams per liter).Resulting gel forms mixture and contains 1.0 weight % methylcellulose, the urea of 5.0 weight %, and 1.0 weight % sulphur urine is dissolved in the water of salinity 55.0 grams per liters.The temperature and time that gel forms, the viscosity number of solution, the MV minium viscosity of mixture and the measurement results such as viscosity of gel are shown in (position preface N5) in the table.
10.0 gram methylcellulose and 10.0 gram thiocarbamides are joined in the hot fresh water of 200.0 grams and obtain uniform solution in the suspension that obtains, adding the 280.0 fresh cold water of gram after the stirring and carefully be stirred to.Add the water model of the injection of 500.0 gram embodiment 5 then, resulting mixture solution contains the methylcellulose of 1.0 weight % and the thiocarbamide of 1.0 weight %, is dissolved in the water of salinity 55.0 grams per liters.The temperature and time that gel forms, the measurement results such as viscosity of the viscosity number of solution and MV minium viscosity and gel are shown in (position preface N6) in the table.
With 10.0 gram methylcellulose, 50.0 gram urea and 20.0 gram thiocarbamides join in the hot fresh water of 400.0 grams, and add 520.0 in the suspension that obtains restrain fresh cold water and also carefully be stirred to and obtain uniform solution after stirring.Resulting mixture contains methylcellulose and the urea of 5.0 weight % and the thiocarbamide of 2.0 weight % of 1.0 weight %.The temperature and time that gel forms, the measurement results such as viscosity of the viscosity number of mixture and MV minium viscosity and gel are shown in (position preface N7) in the table.Embodiment 8
2.5 gram methylcellulose and 20.0 gram urea are joined in the hot fresh water of 400.0 grams, after careful the stirring, in resulting suspension, add 577.5 fresh cold water of gram and further stirring and obtain uniform solution.This mixture contains the methylcellulose of 0.25 weight % and the urea of 2.0 weight %.The temperature and time that gel forms, the measurement results such as viscosity of the viscosity number of prepared mixture and MV minium viscosity and gel are shown in (position preface N8) in the table.
Embodiment 9
5.0 gram methylcellulose and 20.0 gram urea are joined in the hot fresh water of 400.0 grams, after careful the stirring, in the suspension that obtains, add 575.0 fresh cold water of gram and mixing and obtain homogeneous solution.Mixture contains the methylcellulose of 0.5 weight % and the urea of 2.0 weight %.The temperature and time that gel forms, the measurement results such as viscosity of the viscosity number of prepared mixture and MV minium viscosity and gel are shown in (position preface N9) in the table.
In 10.0 gram methylcellulose and 200.0 gram urea, inject the hot fresh water of 300.0 grams, carefully stir the back and in this suspension, add the 490.0 fresh cold water of gram and be stirred to the uniform solution of formation.This mixture contains the methylcellulose of 1.0 weight % and the urea of 20.0 weight %.The temperature and time that gel forms, the measurement results such as viscosity of the viscosity number of the mixture that makes and MV minium viscosity and gel are shown in (position preface N10) in the table.
Embodiment 11
In 20.0 gram methoxy-propyl celluloses and 100.0 gram urea, inject the hot fresh water of 400.0 grams, in this suspension, add the 480.0 fresh cold water of gram and be stirred to and form uniform mixture in the careful back of stirring.Resulting mixture contains the methoxy-propyl cellulose of 2.0 weight % and the urea of 10.0 weight %.Measurement result is shown in (position preface N11) in the table.
Embodiment 12
In 10.0 gram methoxy-propyl celluloses and 50.0 gram urea, inject 400.0 and restrain hot fresh water, after careful the stirring, in this suspension, add the 540.0 fresh cold water of gram and be stirred to the uniform mixture of formation.Resulting this mixture contains the methoxy-propyl cellulose of 1.0 weight % and the urea of 5.0 weight %.Measurement result is shown in (position preface N12) in the table.
Injection 400.0 restrains hot fresh water in 10.0 gram methylcellulose and 5.0 gram thiocarbamides, stirs to add the fresh cold water of 585.0 grams then in the suspension of preparation.After careful the stirring, obtain uniform mixture, wherein contain the methylcellulose of 1.0 weight % and the thiocarbamide of 0.5 weight %.Measurement result is shown in (position preface N13) in the table.
Embodiment 14
In 10.0 gram methylcellulose and 5.0 gram ammonium thiocyanates, inject the hot fresh water of 400.0 grams, in this suspension, add the 585.0 fresh cold water of gram and stir and obtain uniform solution in the careful back of stirring.This mixture contains the methylcellulose of 1.0 weight % and the ammonium thiocyanate of 0.5 weight %.The temperature and time that gel forms, the measurement results such as viscosity of the viscosity number of the mixture that makes and MV minium viscosity and gel are shown in (position preface N14) in the table.
Embodiment 15
In 10.0 gram methylcellulose and 20.0 gram ammonium thiocyanates, inject the hot fresh water of 400.0 grams, in this suspension, add the 570.0 fresh cold water of gram and stir and obtain uniform solution in the careful back of stirring.This mixture contains the methylcellulose of 1.0 weight % and the ammonium thiocyanate of 2.0 weight %.The temperature and time that gel forms, the measurement results such as viscosity of the viscosity number of the mixture that makes and MV minium viscosity and gel are shown in (position preface N15) in the table.
Embodiment 16
To 10.0 gram methylcellulose, inject the hot fresh water of 400.0 grams in 50.0 gram urea and the 20.0 gram ammonium thiocyanates, in this suspension, add the 520.0 fresh cold water of gram and stir and obtain uniform solution in the careful back of stirring.This mixture contains the methylcellulose of 1.0 weight %, the ammonium thiocyanate of the urea of 5.0 weight % and 2.0 weight %.The temperature and time that gel forms, the measurement results such as viscosity of the viscosity number of prepared mixture and MV minium viscosity and gel are shown in (position preface N16) in the table.
Embodiment 17
In 10.0 gram methylcellulose and 10.0 gram thiocarbamides, inject the hot fresh water of 400.0 grams, in this suspension, add the 580.0 fresh cold water of gram and stir and obtain uniform solution in the careful back of stirring.This mixture contains the methylcellulose of 1.0 weight % and the urea of 1.0 weight %.The temperature and time that gel forms, the measurement results such as viscosity of the viscosity number of prepared mixture and MV minium viscosity and gel are shown in (position preface N17) in the table.
The example of this mixture of preparation under industrial condition
Embodiment 18
10.0 kilograms of methylcellulose and 20.0 kilograms of thiocarbamides are feeded in container, prepare mixture, by a vapor heating equipment to wherein infeeding 470.0 kilograms of hot water, stir with a suction pump combined unit, in this container, infeed 500.0 kilograms of fresh cold water and also stir until obtaining uniform solution with the systemic circulation method of pump-container-pump.The mixture that obtains contains the methylcellulose of 1.0 weight % and the thiocarbamide of 2.0 weight %.After this, with the pump combined unit mixture pressure injection is gone in the oil well.With the water that injects design of mixture is advanced to oil reservoir.
In order to study the filtering feature of the mixture that the present invention proposes, used two kinds of mixtures: a kind of mixture contains the methylcellulose of 1.0 weight %, 5.0 the thiocarbamide of the urea of weight % and 1.0 weight %, they are dissolved in the methylcellulose that (Fig. 4) and another kind of mixture in the water of salinity 55.0 grams per liters contain 1.0 weight %, 0.5 the thiocarbamide of weight % is dissolved in (Fig. 5) in the fresh water.King-post reaches 20.4 times (Fig. 4) to infiltration (leakage) property of first kind of mixture, and second kind of mixture reached 4.2 times (Fig. 5).The injection of various mixtures is represented with dotted line in Fig. 4 and Fig. 5.Correspondingly entering the batching value that gel in the hyposmosis king-post forms mixture is 0.009 and 0.129 clearance volume, is 0.27 and 0.259 clearance volume and enter the batching value that gel in the higher infiltration king-post forms mixture.The flowability (mobility) of liquid is 0.035 micron before mixture injects in the hyposmosis king-post
2/ (milli handkerchief second) (Fig. 4, curve 1) and 0.163 micron
2/ (milli handkerchief second) (Fig. 5 curve 1); And ooze in the king-post in height is 1.0 microns
2/ (milli handkerchief second) (Fig. 4, curve 2) and 0.7 micron
2/ (milli handkerchief second) (Fig. 5, curve 2).Generate after the gel under reservoir temperature when being pressed into water, the gel in the hyposmosis king-post is just washed.The flowability (mobility) of liquid is 0.038 micron at the hyposmosis king-post after injecting
2/ (milli handkerchief second) (Fig. 4, curve 1) and 0.1 micron
2/ (milli handkerchief second) (Fig. 5, curve 2) is 0.02 micron and ooze in the king-post at height
2/ (milli handkerchief second) (Fig. 4, curve 2) and 0.001 micron
2/ (milli handkerchief second) (Fig. 5, curve 2), that is the permeability in the hyposmosis king-post still rests on preflood level, and the permeability in height infiltration king-post reduces to original 50-700/one.In the case, redistribution-liquid filtering that filtered fluid stream has just taken place is undertaken by the hyposmosis king-post basically, and what this just caused complementarity squeezes oil (Fig. 4, curve 3,4; Fig. 5 curve 3).Having enumerated gel of the present invention in Fig. 4 and Fig. 5 forms the filtering feature of mixture and oil and squeezes the Research on ability result that.The practicality of industry
Like this, under the situation of the mixture that uses the present invention to propose, can produce the redistribution of filtered fluid stream in pool, the result makes the filling encirclement coefficient of pool be increased to 1.6-2.3 doubly by injecting water.Replenish along with the redistribution of filtered fluid stream and to wash out remaining oil.The recruitment that oil is extruded coefficient or oil discharge rate is 5-12%.Use 11-43 ℃ to compare and to increase the gel formation temperature and increase gel formation time 2-100 doubly with prototype, this might enlarge the application of mixture of the present invention, especially, it can be used for the high temperature oil reservoir, typically, for example be used for the West Siberia habitat of oil.
Table
| The position preface | Cellulose esters | Salinity | Additive weight % | Gel formation temperature ℃ | Viscosity, MPa second | Gel formation time minute under following temperature | |||||||
| Title | Concentration weight 1% | Grams per liter | Urea | Thiocarbamide | Ammonium thiocyanate | Solution viscosity | Minimum solution viscosity | Gel | 60℃ | 70℃ | 90℃ | ||
| 1 | Prototype | 1 | 123.8 | - | - | - | 38 | 54.8 | 29.2 | 640 | 25 | 20 | 10 |
| 2 | Prototype | 1 | 65 | - | - | - | 36 | 64 | 21.2 | 681 | 20 | 15 | 10 |
| 3 | Methylcellulose | 1 | 65 | 20 | - | - | 56 | 90.3 | 33.6 | 670 | 65 | 45 | 25 |
| 4 | Methylcellulose | 1 | 7.8 | 20 | - | - | 74 | 64 | 16.8 | 660 | 1440 | 110 | 50 |
| 5 | Methylcellulose | 1 | 55 | 5 | 1 | - | 74 | 102 | 26 | 600 | 1440 | 120 | 50 |
| 6 | Methylcellulose | 55 | - | 1 | - | 49 | 50.4 | 30.3 | 380 | 50 | 35 | 20 | |
| 7 | Methylcellulose | 0.25 | 0.001 | 5 | 2 | - | 72 | 56.3 | 15.2 | 676 | 1440 | 95 | 45 |
| 8 | Methylcellulose | 0.5 | 0.001 | 2 | - | - | 65 | 7.3 | 1.7 | 396 | 480 | 80 | 45 |
| 9 | Methylcellulose | 1 | 0.001 | 2 | - | - | 63 | 27 | 3.6 | 388 | 130 | 60 | 35 |
| 10 | Methylcellulose | 1 | 0.001 | 20 | - | - | 79 | 50.4 | 11.6 | 172 | 1440 | 190 | 65 |
| 11 | Methylcellulose | 1 | 0.001 | 10 | - | - | 73 | 104 | 19.4 | 635 | 1440 | 110 | 50 |
| 12 | Methylcellulose | 1 | 0.001 | 5 | - | - | 72 | 20.3 | 4.4 | 222 | 150 | 55 | |
| 13 | Methylcellulose | 1 | 0.001 | - | 0.5 | - | 67 | 51.8 | 21.2 | 310 | 170 | 75 | 40 |
| 14 | Methylcellulose | 1 | 0.001 | - | - | 0.5 | 62 | 47.6 | 21.2 | 745 | 150 | 70 | 35 |
| 15 | Methylcellulose | 1 | 0.001 | - | - | 2 | 62 | 47.6 | 21.2 | 745 | 150 | 70 | 35 |
| 16 | Methylcellulose | 1 | 0.001 | 5 | - | 2 | 65 | 44.9 | 21.2 | 635 | 240 | 80 | 40 |
| 17 | Methylcellulose | 1 | 0.001 | - | 1 | - | 68 | 53.3 | 16.8 | 159 | 210 | 85 | 40 |
| 18 | Methylcellulose | 1 | 0.001 | - | 2 | - | 70 | 67.2 | 13.7 | 600 | 240 | 75 | 35 |
Claims (2)
1. mixture based on the raising oil reservoir oil recovery factor of cellulose esters and water, it is characterized in that being to use ester class and the additional urea that uses at least with low critical solution point as cellulose esters, or thiocarbamide, or ammonium thiocyanate, or their mixture, each component is according to following ratio, weight %:
Low critical solution point ester 0.25-2.0
Urea 2.0-20.0
Thiocarbamide 0.5-2.0
Ammonium thiocyanate 0.5-2.0
Water is its surplus
2. mixture as claimed in claim 1 is characterized in that containing methylcellulose or methoxy-propyl cellulose as the low critical solution point ester class of mixture.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU97102864/03A RU2131971C1 (en) | 1997-02-26 | 1997-02-26 | Composition for increase of oil recovery from formation |
| RU97102864 | 1997-02-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1257565A CN1257565A (en) | 2000-06-21 |
| CN1088141C true CN1088141C (en) | 2002-07-24 |
Family
ID=20190199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98801954A Expired - Fee Related CN1088141C (en) | 1997-02-26 | 1998-02-24 | Mixture to increase oil layer recovery |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1088141C (en) |
| RU (1) | RU2131971C1 (en) |
| WO (1) | WO1998038409A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805598B (en) * | 2010-04-14 | 2012-10-03 | 天津科技大学 | Multifunctional regulating, plugging and driving reagent for oil-gas field |
| EA027425B1 (en) * | 2014-12-19 | 2017-07-31 | Республиканское Унитарное Предприятие "Производственное Объединение "Белоруснефть" | Oil field development method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1422975A1 (en) * | 1986-07-14 | 1991-09-07 | Институт химии нефти СО АН СССР | Composition for enhancing oil yield of formations |
| RU2011807C1 (en) * | 1990-04-21 | 1994-04-30 | Сонич Владимир Павлович | Method for petroleum deposit working |
| RU2057914C1 (en) * | 1993-04-27 | 1996-04-10 | Научно-исследовательский институт по нефтепромысловой химии | Oil extraction method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5028344A (en) * | 1989-02-16 | 1991-07-02 | Mobil Oil Corporation | Stabilizing agent for profile control gels and polymeric gels of improved stability |
| US5407475A (en) * | 1993-04-08 | 1995-04-18 | Aqualon Company | Thermally stable thiosulfate hydroxyethylcellulose suspension |
-
1997
- 1997-02-26 RU RU97102864/03A patent/RU2131971C1/en active IP Right Revival
-
1998
- 1998-02-24 CN CN98801954A patent/CN1088141C/en not_active Expired - Fee Related
- 1998-02-24 WO PCT/RU1998/000051 patent/WO1998038409A2/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1422975A1 (en) * | 1986-07-14 | 1991-09-07 | Институт химии нефти СО АН СССР | Composition for enhancing oil yield of formations |
| RU2011807C1 (en) * | 1990-04-21 | 1994-04-30 | Сонич Владимир Павлович | Method for petroleum deposit working |
| RU2057914C1 (en) * | 1993-04-27 | 1996-04-10 | Научно-исследовательский институт по нефтепромысловой химии | Oil extraction method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1998038409A2 (en) | 1998-09-03 |
| CN1257565A (en) | 2000-06-21 |
| RU2131971C1 (en) | 1999-06-20 |
| WO1998038409A3 (en) | 1999-01-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106010485A (en) | Self-cementing leaking stoppage agent and leaking stoppage method | |
| CN105504158A (en) | Intelligent gel particles capable of being crosslinked again under stratum condition and preparation method and application of intelligent gel particles | |
| CN1852964A (en) | Fluid loss control and sealing agent for drilling depleted sand formations | |
| CN110129013B (en) | Organic-inorganic composite gel plugging agent and preparation method and application thereof | |
| CN109915093B (en) | Method for improving oil reservoir recovery ratio by integrating' plugging/regulating/flooding | |
| CN1048738A (en) | Prevent the method for the lost circulation of oil drilling | |
| DE19653136A1 (en) | Method for stabilizing the gas flow in water-bearing gas deposits and natural gas storage | |
| CN102816558A (en) | Plugging agent for deep profile control and water plugging and preparation method thereof | |
| CN109575184A (en) | A kind of reversed-phase emulsion self-crosslinkable type profile-controlling and plugging agent and preparation method thereof | |
| CN1088141C (en) | Mixture to increase oil layer recovery | |
| CN1206442C (en) | Method for preparing controlled size microgel | |
| Pu et al. | Effect of the chromium ion diffusion in polyacrylamide/chromium acetate gelation system with surrounding water on gelation behavior | |
| CN105753414B (en) | A kind of waterproof slab injecting paste material based on magnetized water and preparation method thereof | |
| CN104987857A (en) | High-salinity-resistant self-tackifying hydrophobically associating polymer gel plugging agent and preparing method thereof | |
| CN103980872A (en) | Environmental-friendly gel plugging agent applicable to low-temperature oil pool and applications of gel plugging agent | |
| CN104403655A (en) | Novel fracturing fluid for oil field and preparation method of fracturing liquid | |
| CN105441046B (en) | Suitable for crack and the hydrogen bond hydrogel of solution cavity leak stopping | |
| JP2004519526A (en) | Method and apparatus for controlling saturation of a structure near an oil well | |
| CN109251738A (en) | Sepiolite strengthens hydrophobic associated polymer Gel profile control agent and preparation method thereof | |
| KR20210056249A (en) | Water impermeable material containing biopolymer-soil mixture with filtration function of heavy metals in soil, and experimental system for testing the same | |
| CN109679603B (en) | Composite ionic polymer gel and preparation method thereof | |
| CN1179990C (en) | Amphoteric ion polymer and its preparing process and use | |
| RU2064571C1 (en) | Gel-forming compound for shutoff of water inflow and increase of oil recovery | |
| US3619308A (en) | Method of forming in place a gelled aqueous slurry explosive | |
| CN104877657A (en) | Fracturing fluid for improving recovery ratio |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |