CN113374452A - Thickened oil cold production viscosity reduction method for improving fluidity and application - Google Patents
Thickened oil cold production viscosity reduction method for improving fluidity and application Download PDFInfo
- Publication number
- CN113374452A CN113374452A CN202110615169.8A CN202110615169A CN113374452A CN 113374452 A CN113374452 A CN 113374452A CN 202110615169 A CN202110615169 A CN 202110615169A CN 113374452 A CN113374452 A CN 113374452A
- Authority
- CN
- China
- Prior art keywords
- oil
- viscosity
- hydraulic
- viscosity reducer
- vibration source
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000009467 reduction Effects 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 239000003921 oil Substances 0.000 claims abstract description 96
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 59
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000010779 crude oil Substances 0.000 claims abstract description 29
- 238000011084 recovery Methods 0.000 claims abstract description 25
- 239000006260 foam Substances 0.000 claims abstract description 24
- 230000010355 oscillation Effects 0.000 claims abstract description 22
- 239000003129 oil well Substances 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 17
- 239000008398 formation water Substances 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 6
- 238000009434 installation Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 239000007864 aqueous solution Substances 0.000 claims description 31
- 239000004088 foaming agent Substances 0.000 claims description 11
- 239000000295 fuel oil Substances 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 8
- 230000002579 anti-swelling effect Effects 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 4
- -1 alkylbenzene sulfonate Chemical class 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 13
- 238000010276 construction Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000010795 Steam Flooding Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000000857 drug effect Effects 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 229940077388 benzenesulfonate Drugs 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000003027 oil sand Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Lubricants (AREA)
Abstract
The application discloses a thick oil cold production viscosity reduction method for improving fluidity, which comprises the following steps: the method comprises the following steps of firstly, installing a hydraulic vibration source in an oil well, wherein the installation depth of the hydraulic vibration source approximately corresponds to the depth of an oil layer; injecting a nitrogen foam slug into the oil well to plug formation water; step three, starting the hydraulic vibration source to generate continuous hydraulic oscillation pulse flow, and simultaneously injecting a viscosity reducer into the oil well, wherein the injection speed of the viscosity reducer is 5-6m3The hydraulic vibration source has the vibration frequency of 30-40 Hz and the amplitude of 6-10 MPa; and fourthly, soaking the well, taking out the hydraulic vibration source, and recovering the oil pumping operation. The application provides a thickened oil cold recovery viscosity reduction method for improving fluidityAccording to the method, a low-frequency hydraulic oscillator is adopted to carry out hydraulic oscillation at higher vibration frequency and strength, so that the viscosity reducer is more fully mixed with crude oil in a stratum, the dispersity of the viscosity reducer is improved, and the viscosity reduction effect of the viscosity reducer is remarkably improved.
Description
Technical Field
The application belongs to the technical field of oilfield exploitation, and particularly relates to a thickened oil cold production viscosity reduction method for improving fluidity and application thereof.
Background
The traditional mode of shallow layer thickened oil development is steam huff and puff or steam flooding, and the technical core is heating an oil layer to achieve the purposes of reducing the viscosity of crude oil and improving the fluidity of the crude oil. Through years of research and field practice, steam huff and puff or steam flooding technology is becoming mature day by day, but the problems of high investment, high development cost, serious steam channeling and 'overspread' phenomena in the later development period, low utilization efficiency of steam injection in the later period and the like generally exist. In recent years, as the international oil price falls and vibrates at a low position for a long time, a plurality of oil companies give reference settlement prices for production increasing measures, so that the application range of the thermal recovery technology is more and more narrow.
In order to improve the recovery ratio of the thick oil in a low-cost operation mode, cold recovery technical measures are taken. The existing thick oil cold production technology comprises a sand production cold production process, a chemical cold production oil displacement technology and a microbial oil displacement technology. However, the recovery ratio of the sand production cold recovery process is low, the treatment difficulty of the produced oil sand is high, and the cost is very high; the chemical cold recovery technology has unstable recovery ratio, non-lasting action time and unstable effect, and has no obvious effect on the super heavy oil reservoir; the microbial oil displacement technology needs to screen strains through a large number of experiments, is basically only suitable for the same block, and has unstable recovery rate.
In addition, under the condition of long-term steam flooding, part of oil fields in China begin to step into a high water content oil extraction stage, for example, part of regional oil reservoirs of the Taiping oil field of Dongsheng oil company, the oil extraction speed and the extraction degree are lower at present, and the method has the characteristics of thin oil layer, high crude oil viscosity, active bottom water and the like, and has poor effect when a steam over-injection thermal recovery mode is adopted in the early period. For heavy oil with high water content and high viscosity, the conditions of parameters such as water fluidity, oil-water viscosity ratio and the like in an oil reservoir area are complex, the crude oil has poor fluidity, and the drug effect is difficult to exert by adopting a mode of directly injecting an oil displacement agent for cold recovery, so that the recovery rate is difficult to improve, the oil recovery effect is unstable, and the application effect of cold recovery oil displacement is limited.
Disclosure of Invention
In order to solve the problems, the application aims to provide a cold recovery viscosity reduction method which can enhance the dispersibility of a viscosity reduction oil displacement agent in an oil field oil layer with high water content, high viscosity and poor oil-water fluidity so as to give full play to the drug effect, further remarkably improve the fluidity of crude oil and achieve the yield increase effect.
In one aspect, the application provides a method for reducing viscosity of heavy oil by cold recovery, which comprises the following steps:
the method comprises the following steps of firstly, installing a hydraulic vibration source in an oil well, wherein the installation depth of the hydraulic vibration source approximately corresponds to the depth of an oil layer;
injecting a nitrogen foam slug into the oil well to plug formation water;
step three, starting the hydraulic vibration source to generate continuous hydraulic oscillation pulse flow, and simultaneously injecting a viscosity reducer into the oil well, wherein the injection speed of the viscosity reducer is 5-6m3The hydraulic vibration source has the vibration frequency of 30-40 Hz and the amplitude of 6-10 MPa;
and fourthly, soaking the well, taking out the hydraulic vibration source, and recovering the oil pumping operation.
Preferably, the viscosity reducer is a water-soluble viscosity reducer.
Preferably, the amplitude of the hydraulic vibration source is 6-8 MPa.
According to the method for reducing the viscosity of the thick oil in the cold production, after the hydraulic vibration source is installed in advance, the nitrogen foam is firstly injected into the underground, and then the viscosity reducer is injected into the underground. The nitrogen foam slug is injected to form a large amount of compact and stable foam, and the foam preferentially enters a large-pore channel which is easy to generate a water cone, so that the nitrogen foam slug can play a role in pressing the water cone and reduce the water content of the produced oil; on the other hand, the formation water can be blocked through the Jamin effect, and then enters an oil layer when the viscosity reducer is injected subsequently; in yet another aspect, the injected foam may also energize the oil layer. The purpose of injecting the viscosity reducer is to reduce the tension of an oil-water interface, disperse the formation crude oil in water, form stable oil-in-water liquid, reduce the viscosity of the formation crude oil and further improve the fluidity of the crude oil, and solve the problems that the formation crude oil is difficult to use and difficult to pump, however, the viscosity reducer has poor dispersibility in high-viscosity heavy crude oil with poor fluidity, and the oil extraction efficiency and the oil extraction effect are difficult to improve only by a pressurization injection mode.
Further, the source of hydraulic vibration comprises a low frequency hydraulic oscillator.
The low-frequency hydraulic oscillator can generate low-frequency hydraulic shock waves with certain intensity, and under the action of hydraulic oscillation, the solid-liquid and liquid-liquid interfacial tension between a stratum and an oil layer is reduced, so that residual oil distributed in a stratum gap is redistributed and moved, the accumulation and seepage of the residual oil are promoted, and drainage and flooding are facilitated. Meanwhile, the low-frequency hydraulic oscillation can also vibrate, crack and unblock the stratum, remove the pollution and blockage of the oil layer, further improve the permeability of the stratum, improve the oil-water distribution and the flow performance and achieve the aim of improving the crude oil recovery ratio.
Further, the number of the hydraulic vibration sources is at least two.
Preferably, the plurality of hydraulic vibration sources are distributed in the oil well in an arrangement manner along the height direction of the pipeline, and the arrangement position corresponds to the position of the oil layer so as to expand the influence range of the hydraulic vibration.
Further, the step of injecting the nitrogen foam slug in the second step comprises:
simultaneously injecting a foaming agent aqueous solution and nitrogen into an oil well, wherein the mass concentration of the foaming agent aqueous solution is 2-3%;
preferably, the volume ratio of the foaming agent aqueous solution to the nitrogen gas is 1m3:(80～150)Nm3；
Preferably, the injection speed of the foaming agent aqueous solution is 8-12 m3/h。
Preferably, the foaming agent can be a mixture prepared from an emulsifier and a foam stabilizer, more preferably a mixture of an emulsifier AES and a foam driving foam stabilizer FP3330S, wherein the mass concentration of AES can be 0.2-0.3%, and the mass concentration of FP3330S can be 0.03-0.05%.
Further, the step two also comprises a step of adding a clay anti-swelling agent and a foam stabilizer, wherein the mass ratio of the clay anti-swelling agent to the foam stabilizer is (1.2-1.8): (0.2-0.5).
Further, the step of injecting the viscosity reducer in the step three comprises the following steps:
adding the prepared viscosity reducer aqueous solution for 2-10 times, and injecting 500-10000 Nm after adding the viscosity reducer aqueous solution each time3The mass concentration of the viscosity reducer in the viscosity reducer aqueous solution is 3-6%;
preferably, the injection pressure of the viscosity reducer aqueous solution is 14-17 MPa.
Further, the viscosity reducer is prepared from the following components in a mass ratio of (0.5-5): 1, C1-C4 alcohol and C8-C16 alkylbenzene sulfonate are compounded to obtain the product.
Further, in the third step, during the process of injecting the viscosity reducer, the hydraulic vibration source is lifted up or lowered down to adjust the depth position of the hydraulic oscillation.
Further, the time duration of soaking in the fourth step is 20-50 h.
On the other hand, the application also provides the application of the thick oil cold recovery viscosity reduction method in thick oil reservoir exploitation, wherein the viscosity of crude oil of the thick oil reservoir is greater than 20000mpa.s, the water content of the crude oil is greater than 60%, preferably, the viscosity of the crude oil is greater than 22000mpa.s, and the water content of the crude oil is greater than 70%.
Preferably, the stratum of the heavy oil reservoir has the porosity of more than 30 percent and the permeability of more than 2500 multiplied by 10-3μm2。
Benefits that can be produced by the present application include, but are not limited to:
according to the viscosity reduction method for cold production of thickened oil with improved fluidity, the viscosity reducer is injected underground, and simultaneously, the low-frequency hydraulic oscillator is adopted to carry out hydraulic oscillation at higher vibration frequency and strength, so that the viscosity reducer is more fully mixed with crude oil in a stratum, the dispersibility of the viscosity reducer is improved, and the oil fluidity, the water fluidity and the oil-water viscosity ratio in an oil layer are improved; and the specific pulse type flow beam of the low-frequency hydraulic oscillator can send the viscosity reducer to the far end of the stratum, so that the swept radius is increased, and the viscosity reduction effect of the viscosity reducer is remarkably improved. Experiments show that the viscosity reduction rate of the thick oil cold recovery viscosity reduction method provided by the application is up to 99% and the water content of the produced oil is less than 40% for the crude oil with the viscosity of more than 20000mpa.s and the water content of more than 60%.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of the oil well construction of the method for reducing viscosity by cold production of heavy oil provided in example 1;
in the figure: 1. an oil pipe; 2. artificial well bottom; 3. a vibration source pipe column; 4. and (3) an oil layer.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention.
In a preferred embodiment, the application provides a viscosity reduction method for cold production of thick oil, which can improve the fluidity of thick oil, can significantly reduce the viscosity of crude oil, improve the fluidity of crude oil, solve the problem of difficult pumping of crude oil, and is particularly suitable for the production of thick oil with the viscosity of more than 20000mpa.s and the water content of more than 60%. The method specifically comprises the following steps:
step one, installing a low-frequency hydraulic oscillator in a vertical oil well, wherein the installation position of the low-frequency hydraulic oscillator approximately corresponds to the depth position of an oil layer;
injecting a nitrogen foam slug into the oil well, specifically, injecting a foaming agent water solution with the mass concentration of 2-3% and nitrogen in a volume ratio of 1m3:(80～150)Nm3The mixture is simultaneously injected into the oil well at the injection speed of 8-12 m3H, to plug formation water;
step three, starting the low-frequency hydraulic oscillator to generate continuous hydraulic oscillation pulse flow, simultaneously injecting a water-soluble viscosity reducer into the oil well, specifically, adding the prepared viscosity reducer aqueous solution 2-10 times, and injecting 500-10000 Nm after adding the viscosity reducer aqueous solution each time3The mass concentration of the viscosity reducer in the viscosity reducer aqueous solution is 3% -6%, the injection pressure is 14-17 MPa, and after the viscosity reducer aqueous solution and the nitrogen are injected once, the position of a low-frequency hydraulic oscillator is properly raised or lowered within the depth range of an oil field layer so as to enlarge the action range of hydraulic oscillation pulse flow in the oil layer, wherein the mass ratio of the viscosity reducer is (0.5-5): 1C1～C4Alcohols with C8～C16The alkyl benzene sulfonate is obtained by compounding;
and fourthly, after soaking for 20-50 hours, stopping running the low-frequency hydraulic oscillator and pulling out the low-frequency hydraulic oscillator, and recovering the oil pumping operation.
Unless otherwise specified, the following examples were all carried out by the above-described method.
The following example selects the Dongying Taiping oilfield A well for construction. Wherein, the well conditions of the Taiping oilfield A well are as follows:
and (3) carrying out sand control production of a new well in 6 months of 2007 on the A well, wherein the average daily oil production is 3.6 tons in the initial stage, and 4291 tons of oil are produced by accumulating at the end of 2010, the daily oil production is about 1 ton, the water content gradually rises, and the bottom water is subjected to coning. The well was operated for water shutoff in 12 months 2014. The daily oil is 1.2t/d before the well measure, the daily oil is 2.5t/d after the measure, the oil increment is 1.3t/d, the effective period is 7 months, 290 tons of oil increment is accumulated, and the effect is general.
The well position is as follows: ngs4, sand interval: 1142.99-1270.30 m, sand layer thickness: 127.31m, production interval: 1142.99-1270.30 m, effective thickness: 127.31m, crude oil viscosity 23556mpa.s, water content 77%, is a high water content, high viscosity, heavy crude oil. Ngs4 porosity 33.2% and permeability 2966.5X 10-3μm2The lithology with bottom water-structure heavy oil reservoir. Group Ngs4 cementation pattern was primarily contact, with the mineral composition being primarily: quartz, average content 70%; clay mineral, average content 5.7%. The characteristics of high component maturity and high structural maturity are shown. Chloride ion: typically 3132-6913mg/L, the average content 5109 mg/L; total degree of mineralization: generally 6041-13136mg/L, and the average content 9259 mg/L; water type: MgCl2And (4) molding.
Example 1
In the embodiment, the thickened oil cold recovery viscosity reduction method is adopted to construct the well A.
Firstly, construction preparation:
1. medicament: 1.5t of clay anti-swelling agent aqueous solution, 1% of mass concentration, 0.3t of foam stabilizer, 1% of mass concentration, foaming agent aqueous solution: 0.2 to 0.3 percent of AES and 0.03 to 0.05 percent of FP 3330S; 30t of viscosity reducer aqueous solution, and the mass concentration is 5%, wherein the viscosity reducer in the viscosity reducer aqueous solution adopts a mass ratio of 3: 1 isopropanol with C8～C16The alkylbenzene sulfonate is obtained by compounding.
2. Before construction, installing an union, connecting a wellhead pipeline, and constructing by matching with a process; the connected well head and the ground pipeline are ensured to be impervious and leakless under 15 MPa.
3. 1 plunger pump, the rated working pressure is 35MPa, and the discharge capacity is not lower than 120L/min.
4. 2 tank cars.
5、15m3A liquid preparation stirring tank and a stirring device.
6. Installing a tool for the hydraulic oscillator, and selecting a low-frequency hydraulic oscillator with the following parameters:
working displacement: 100m3/d-400m3/d；
And (3) working pump pressure: 10-40 Mpa;
the working frequency is as follows: 6-40 Hz;
treatment time: 6 hours/(10-50) m;
applicable well depth (measure formation depth): less than or equal to 4000 m.
Secondly, the concrete construction steps are as follows:
the method comprises the following steps: and (3) an installation stage:
taking out the whole well pipe column and approving the size of the oil pipe;
assembling vibration source pipe columns of the low-frequency hydraulic oscillator, and lowering the vibration source pipe columns to the positions, which are approximately corresponding to an oil layer, in an oil pipe according to the requirements of a construction design book, wherein two vibration source pipe columns are vertically arranged in the oil pipe and respectively correspond to the position close to the top of the oil layer and the position close to the bottom of the oil layer as shown in figure 1;
after ground equipment such as a nitrogen injection truck group, a pump truck pipeline and the like are connected, pressure test is carried out, the pressure test is 15MPa, various manifolds are guaranteed to be smooth, the gate is flexible and good to use, and the gate is qualified in that no puncture or no leakage exists; and (5) starting a pump to pressurize and wash the bottom of the well until no pollutants exist in the upper water return.
Step two, injecting 1.5t of clay anti-swelling agent aqueous solution and 0.3t of foam stabilizer into the oil well, and injecting nitrogen foam slug, specifically, injecting 300m of 2% foam agent aqueous solution3+ Nitrogen 3.0X 104Nm3Simultaneously injecting into oil well at an injection speed of 10m3And h, plugging formation water.
Starting the low-frequency hydraulic oscillator to generate continuous hydraulic oscillation pulse flow and simultaneously injecting a water-soluble viscosity reducer into the oil well, whereinExtruding the viscosity reducer aqueous solution twice, specifically, extruding the viscosity reducer aqueous solution with the concentration of 5% for 300m3Nitrogen injection 900Nm3(ii) a Lifting or lowering the positions of two vibration source pipe columns in the oil pipe to oscillate other positions of the oil layer, expanding the oscillation range, and extruding into a 5% viscosity reducer aqueous solution 300m3Nitrogen gas injection 5000Nm3(ii) a Wherein the extrusion mode of the viscosity reducer aqueous solution is positive extrusion, the injection pressure is 15MPa, and the injection speed is 8m3/h。
And fourthly, stewing for 24-48 hours, stopping running the low-frequency hydraulic oscillator, pulling out the whole well pipe column and the vibration source pipe column, detecting a pump, putting the oil pumping pipe column down, and recovering oil pumping operation.
Examples 2 to 7
The construction method of examples 2 to 7 was substantially the same as that of example 1 except that the oscillation frequency and the oscillation intensity (i.e., amplitude) of the hydraulic oscillation were different.
Comparative example 1
The construction of comparative example 1 was performed in substantially the same manner as in example 1, except that the low-frequency hydraulic oscillator was not started during the entire process, i.e., hydraulic oscillation-assisted viscosity reduction was not employed.
The crude oils produced by the above examples and comparative examples were subjected to viscosity and moisture measurements, wherein the crude oil viscosity prior to the use of the above method was 23556mpa.s (50 ℃), moisture 77%, and formation level homomineralization 9259 mg/L. The parameters of the hydraulic oscillations and the results obtained for each specific example are shown in table 1.
TABLE 1
As can be seen from the data in table 1, compared with a cold recovery method in which only a viscosity reducer is injected, the embodiment adopts a mode of assisting in hydraulic oscillation while injecting the viscosity reducer, so that the dispersibility of the viscosity reducer in crude oil can be significantly improved, the drug effect of the viscosity reducer is improved, the viscosity of the crude oil is reduced, and the oil-water fluidity is improved, thereby improving the oil recovery efficiency. And the higher the frequency of hydraulic oscillation is, the better the viscosity reduction effect of the viscosity reducer is, and particularly when the frequency is 30-40 Hz, the viscosity reduction rate of the produced oil is higher than 96%.
However, the reduction in water content of the produced oil in the above examples is not significant, presumably due to the decreased ability of the foam slug to plug formation water as the frequency of the hydraulic oscillations increases. To further reduce the water content of the produced oil, examples 8-12 were continued and the water content of the produced oil was improved by adjusting the injection rate of the viscosity reducing agent, and the results are shown in Table 2.
TABLE 2
As can be seen from the data in Table 2, when the viscosity reducer is injected at a rate of 5 to 6m3And during the reaction time/h, the water content of the produced oil is obviously reduced, and the viscosity reduction effect is further improved.
In summary, in the method for viscosity reduction in cold production of heavy oil provided by the application, the optimal process parameters are as follows: the hydraulic oscillation frequency is 30-40 Hz, the amplitude is 6-8 MPa, and the injection speed of the viscosity reducer aqueous solution is 5-6m3H is used as the reference value. Before the method provided by the application is adopted, the daily oil yield of the well is 2.5t/d, and the daily liquid yield is 2.84 t/d; after the method provided by the preferred embodiment is adopted, the daily oil yield of the well can reach 3.6t/d, the daily liquid yield can reach 4.3t/d, and the growth rate can reach 44%.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method for reducing viscosity of thick oil by cold production for improving fluidity is characterized by comprising the following steps:
the method comprises the following steps of firstly, installing a hydraulic vibration source in an oil well, wherein the installation depth of the hydraulic vibration source approximately corresponds to the depth of an oil layer;
injecting a nitrogen foam slug into the oil well to plug formation water;
step three, starting the hydraulic vibration source to generate continuous hydraulic oscillation pulse flow, and simultaneously injecting a viscosity reducer into the oil well, wherein the injection speed of the viscosity reducer is 5-6m3The hydraulic vibration source has the vibration frequency of 30-40 Hz and the amplitude of 6-10 MPa;
and fourthly, soaking the well, taking out the hydraulic vibration source, and recovering the oil pumping operation.
2. The viscosity reduction method for cold production of thick oil with improved fluidity according to claim 1, wherein the hydraulic vibration source comprises a low-frequency hydraulic oscillator.
3. The viscosity reduction method for cold production of thick oil with improved fluidity according to claim 1, wherein the number of the hydraulic vibration sources is at least two.
4. The viscosity reduction method for cold production of thick oil with improved fluidity according to claim 1, wherein the step of injecting the nitrogen foam slug in the second step comprises the following steps:
simultaneously injecting a foaming agent aqueous solution and nitrogen into an oil well, wherein the mass concentration of the foaming agent aqueous solution is 2-3%;
preferably, the volume ratio of the foaming agent aqueous solution to the nitrogen gas is 1m3:(80～150)Nm3；
Preferably, the injection speed of the foaming agent aqueous solution is 8-12 m3/h。
5. The viscosity reduction method for cold recovery of thickened oil with improved fluidity according to claim 1, wherein the second step further comprises a step of adding a clay anti-swelling agent and a foam stabilizer, wherein the mass ratio of the clay anti-swelling agent to the foam stabilizer is (1.2-1.8): (0.2-0.5).
6. The viscosity reduction method for cold recovery of thick oil with improved fluidity according to claim 1, wherein the step three of injecting the viscosity reducer comprises the following steps:
adding the prepared viscosity reducer aqueous solution for 2-10 times, and injecting 500-10000 Nm after adding the viscosity reducer aqueous solution each time3The mass concentration of the viscosity reducer in the viscosity reducer aqueous solution is 3-6%;
preferably, the injection pressure of the viscosity reducer aqueous solution is 14-17 MPa.
7. The viscosity reduction method for cold production of thickened oil with improved fluidity according to claim 1 or 6, wherein the viscosity reducer is prepared from the following raw materials in a mass ratio of (0.5-5): 1C1～C4Alcohols with C8～C16The alkylbenzene sulfonate is obtained by compounding.
8. The viscosity reduction method for cold production of thick oil with improved fluidity according to claim 1, wherein the step three is to lift or lower the hydraulic vibration source to adjust the depth position of hydraulic oscillation during the process of injecting the viscosity reducer.
9. The viscosity reduction method for cold production of thickened oil with improved fluidity according to claim 1, wherein the soaking time in the fourth step is 20-50 h.
10. The application of the viscosity reduction method for cold recovery of heavy oil with increased fluidity of any one of claims 1 to 9 in the exploitation of a heavy oil reservoir, wherein the viscosity of the crude oil of the heavy oil reservoir is more than 20000mpa.s, and the water content of the crude oil is more than 60%; preferably, the stratum of the heavy oil reservoir has the porosity of more than 30 percent and the permeability of more than 2500 multiplied by 10-3μm2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110615169.8A CN113374452A (en) | 2021-06-02 | 2021-06-02 | Thickened oil cold production viscosity reduction method for improving fluidity and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110615169.8A CN113374452A (en) | 2021-06-02 | 2021-06-02 | Thickened oil cold production viscosity reduction method for improving fluidity and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113374452A true CN113374452A (en) | 2021-09-10 |
Family
ID=77575462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110615169.8A Pending CN113374452A (en) | 2021-06-02 | 2021-06-02 | Thickened oil cold production viscosity reduction method for improving fluidity and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113374452A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183107A (en) * | 2021-12-03 | 2022-03-15 | 中国石油大学(华东) | Environment-friendly method for reducing viscosity and cold recovery of thick oil |
| CN114412415A (en) * | 2022-04-01 | 2022-04-29 | 海泰能源科技(天津)有限公司 | Self-excitation resonance wax-proof and scale-inhibiting device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2475823Y (en) * | 2000-12-12 | 2002-02-06 | 辽河石油勘探局工程技术研究院 | Low-frequency wave resonant oil recovery device for oil wall |
| CN1975103A (en) * | 2006-12-09 | 2007-06-06 | 中国石化股份胜利油田分公司孤岛采油厂 | Chemical pulse compound unplugging method |
| CN204113222U (en) * | 2014-08-28 | 2015-01-21 | 中国石油天然气股份有限公司 | A kind of vibration wax-proof viscosity reducing vibrating reed, device and sucker rod |
| CN104314539A (en) * | 2014-10-20 | 2015-01-28 | 中国石油天然气股份有限公司 | Artificial foaming-oil huff and puff oil production method for heavy oil reservoir |
| WO2017076368A1 (en) * | 2015-11-06 | 2017-05-11 | 汪必启 | Energy-saving and environment-friendly paraffin and scale control ultra-strong viscosity reduction device |
-
2021
- 2021-06-02 CN CN202110615169.8A patent/CN113374452A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2475823Y (en) * | 2000-12-12 | 2002-02-06 | 辽河石油勘探局工程技术研究院 | Low-frequency wave resonant oil recovery device for oil wall |
| CN1975103A (en) * | 2006-12-09 | 2007-06-06 | 中国石化股份胜利油田分公司孤岛采油厂 | Chemical pulse compound unplugging method |
| CN204113222U (en) * | 2014-08-28 | 2015-01-21 | 中国石油天然气股份有限公司 | A kind of vibration wax-proof viscosity reducing vibrating reed, device and sucker rod |
| CN104314539A (en) * | 2014-10-20 | 2015-01-28 | 中国石油天然气股份有限公司 | Artificial foaming-oil huff and puff oil production method for heavy oil reservoir |
| WO2017076368A1 (en) * | 2015-11-06 | 2017-05-11 | 汪必启 | Energy-saving and environment-friendly paraffin and scale control ultra-strong viscosity reduction device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183107A (en) * | 2021-12-03 | 2022-03-15 | 中国石油大学(华东) | Environment-friendly method for reducing viscosity and cold recovery of thick oil |
| CN114412415A (en) * | 2022-04-01 | 2022-04-29 | 海泰能源科技(天津)有限公司 | Self-excitation resonance wax-proof and scale-inhibiting device and method |
| CN114412415B (en) * | 2022-04-01 | 2022-06-10 | 海泰能源科技(天津)有限公司 | Self-excitation resonance wax-proof and scale-proof device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102587858B (en) | Method for blocking water for fracture and hole type reservoir | |
| CN101333922A (en) | Fracturing process for removing breakdown fluid contamination | |
| CN109653721B (en) | Fracturing and energy-increasing oil displacement integrated process method for shallow low-pressure low-permeability oil reservoir | |
| CN113374452A (en) | Thickened oil cold production viscosity reduction method for improving fluidity and application | |
| CN109736757B (en) | Production increasing method for reducing pressure loss in gas well by using compressor | |
| CN104265254A (en) | Oil production technological method for multi-stage plug injection of oil-soluble viscosity reducer and liquid CO2 in deep super-heavy oil | |
| CN104033143A (en) | Formation method of nitrogen foam ground for oil-gas well fracturing | |
| CN111456693B (en) | Method for supplementing formation energy by advanced gas injection and continuous gas injection of tight-shale oil reservoir | |
| CN106837286B (en) | Top oil-gas layer fracturing process for full fracturing transformation of thick sand body | |
| CN113187459B (en) | Carbon dioxide acid fracturing method for ultra-deep well carbonate rock reservoir transformation | |
| CN112796729B (en) | Quasi-dry method liquid supercritical CO 2 Acid fracturing method | |
| CN1995267A (en) | Macropore plugging gelatin | |
| CN111810102B (en) | Method for controlling bottom water channeling by utilizing gas water lock effect | |
| CN112049614B (en) | Oil extraction method for huff and puff of low-pressure fractured compact oil reservoir by integrally over-injecting carbon dioxide into different wells | |
| CN101967964B (en) | Method for prewashing multi-density double-setting long-sealing gas channeling prevention well cementing | |
| CN104178100A (en) | Multielement profile control system suitable for water flooding exploitation oil fields and profile control technology | |
| CN203403868U (en) | Heavy oil well double-jet-pump lifting pipe string | |
| CN101280184A (en) | Foam curing profile control agent for steam stimulation well and injection technology | |
| CN112324411A (en) | Loose sandstone heavy oil reservoir vertical well complex long-seam fracturing process | |
| CN114439437A (en) | Method for improving recovery ratio of low-permeability reservoir through water injection pressure flooding | |
| CN108457633A (en) | A kind of sleective fracturing method in layer | |
| CN112980411A (en) | Selective long-acting plugging agent for oil field and preparation method thereof | |
| CN109388771B (en) | Calculation method for production parameters of deep thickened oil foam oil viscosity-reducing huff-puff well | |
| CN113356820A (en) | Fracturing method | |
| CN112280544B (en) | Emulsion type precipitation profile control agent and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210910 |
|
| RJ01 | Rejection of invention patent application after publication |