CN105673004B - A method of exploitation high pour point oil reservoir - Google Patents

A method of exploitation high pour point oil reservoir Download PDF

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Publication number
CN105673004B
CN105673004B CN201511024700.5A CN201511024700A CN105673004B CN 105673004 B CN105673004 B CN 105673004B CN 201511024700 A CN201511024700 A CN 201511024700A CN 105673004 B CN105673004 B CN 105673004B
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oil reservoir
oil
target area
pour point
reservoir
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CN105673004A (en
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戎凯旋
王朝
叶继根
高大鹏
黄磊
傅秀娟
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China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08Obtaining fluid samples or testing fluids, in boreholes or wells
    • E21B49/087Well testing, e.g. testing for reservoir productivity or formation parameters

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Lubricants (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

The embodiment of the present application discloses a kind of method for developing high pour point oil reservoir, it include: the sample for obtaining geologic information, well-log information and target area oil reservoir fluid, the distribution of the oil reservoir is obtained, determines the geologic feature of the target area and the chemical composition and attribute of the reservoir fluid;Draw the first curve of the target area reservoir fluid;Production method corresponding with the distribution of the oil reservoir of the target area is determined according to the geologic information;The oil well of target area is tested, the test result under different production systems is obtained;The best production system that the target area oil well is determined according to the first curve of the target area carries out the exploitation of high pour point oil reservoir using the best production system to above-mentioned target area.The method of exploitation high pour point oil reservoir provided by the embodiments of the present application, can be improved the recovery ratio of primary oil recovery.

Description

A method of exploitation high pour point oil reservoir
Technical field
This application involves Oil-Gas Field Development Engineering technical field, in particular to a kind of method for developing high pour point oil reservoir.
Background technique
High pour point oil reservoir generally refers to the oil reservoir that crude oil freezing point is greater than 10% greater than 40 degrees Celsius, paraffin content.The solidifying oil of height Reservoir Crude Oil property has the characteristics that " three high ", i.e., paraffin content is high, freezing point is high, wax precipitation point is high.Paraffin content range 10%~ 57%, generally 20%~40%;Freezing point is generally 25~59 degrees Celsius, up to 67 degrees Celsius;Wax precipitation point general 40~ 74 degrees Celsius.High pour point oil reservoir is extremely sensitive to temperature, has unique three-stage viscosity-temperature curve feature, therefore general Waterflooding extraction during easily there is cold damage, cause in-place oil analysis wax, pore constriction blocking, reservoir permeability decline, produce Measure rapid decrement.
The production technique of high pour point oil reservoir and method with Oil Reservoir Types, the differences of base oil properties and it is different.The solidifying oil of height is being analysed Nowed forming has apparent difference before and after wax, Newton and non-Newton fluid flow characteristics is presented respectively, therefore lead to height Solidifying oil oil reservoir and the conventional development scheme of oil reservoir are different, and when temperature influences the deciding factor of high solidifying oil seepage characteristic, while original Oil viscosity is especially sensitive to temperature change, and as temperature reduces, the solidifying oily percolation ability of height sharply declines, before crude oil wax precipitation point Afterwards, this variation is more obvious, and the fluid ability under freezing point is almost nil.
When high pour point oil reservoir is developed using natural energy, there are following behavioral characteristics: one, initial stage of development yield Height, rate of oil production is high, reaches production peak in a short time, stable production period is short, and lapse rate is big.Two, aqueous aobvious with recovery percent of reserves relationship " three low one is high " feature is shown: anhydrous period recovery percent of reserves is low, low Water-cut Period recovery percent of reserves is low, natural water drive low efficiency, containing waterborne The rate of liter is high.Three, new well primiparity declines year by year, and stimulation effect has variation trend.Four, excessive use natural energy exploitation makes ground Stressor layer is lower than crude oil saturation pressure, and crude oil deaeration, light hydrocarbon component are precipitated, and will lead to high pour point oil reservoir analysis wax problem, leads to oil Natural declining rate is high during the later development of field, aqueous rising is fast, recovery percent of reserves is low, recovery ratio is low.
Summary of the invention
The purpose of the embodiment of the present application is to provide a kind of method for developing high pour point oil reservoir, to improve the harvesting of primary oil recovery Rate.
In order to solve the above technical problems, a kind of method that the embodiment of the present application provides exploitation high pour point oil reservoir is realized in :
A method of exploitation high pour point oil reservoir, comprising:
The sample for obtaining geologic information, well-log information and target area oil reservoir fluid, obtains the oil reservoir Distribution, determines the geologic feature of the target area and the chemical composition and attribute of the reservoir fluid;Draw the target First curve of region reservoir fluid;
Production method corresponding with the distribution of the oil reservoir of the target area is determined according to the geologic information;
The oil well of target area is tested, the test result under different production systems is obtained;
The best production system that the target area oil well is determined according to the first curve of the target area, utilizes institute State the exploitation that best production system carries out high pour point oil reservoir to above-mentioned target area.
In preferred embodiment, first curve includes: the viscosity and vs. temperature for describing the reservoir fluid Curve.
In preferred embodiment, the geologic feature includes: oil area, oil-water interfaces information, permeability and porosity.
In preferred embodiment, the distribution of the oil reservoir includes: that oil reservoir gas-bearing formation is continuously distributed, is divided or, oil reservoir gas-bearing formation intersects Cloth.
In preferred embodiment, the attribute of the reservoir fluid includes: freezing point, paraffin content and/or wax precipitation point.
In preferred embodiment, the production method comprises determining that the purpose of horizon, perforating depth and shot density of perforation.
In preferred embodiment, the difference production system includes: different choke sizes and/or different production durations.
In preferred embodiment, the test result includes: the thermo parameters method situation of pit shaft, the distribution of the pressure of pit shaft, well head Temperature, well head pressure and capacity of well.
In preferred embodiment, the method also includes: real-time monitoring is carried out to the first state of the target area oil well.
In preferred embodiment, the first state includes: that oily well yield, the production gas-oil ratio of oil well, oil well fluid contain Water rate, wellhead temperature and/or well head pressure.
As can be seen from the technical scheme provided by the above embodiments of the present application, a kind of exploitation high pour point oil reservoir of the embodiment of the present application The temperature and pressure of pit shaft can be maintained at a higher level, adopting for primary oil recovery can be greatly improved by method Yield greatly reduces the cost of operation, has achieved the purpose that economical and efficient develops high pour point oil reservoir.It is also convenient for simultaneously to oil gas Collection is defeated and processing is operated.On the other hand, asking for reservoir damage can effectively be avoided using natural gas lift method in situ Topic, convenient for the adjustment of subsequent production measure.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The some embodiments recorded in application, for those of ordinary skill in the art, in the premise of not making the creative labor property Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the flow chart of method one embodiment that the application develops high pour point oil reservoir;
Fig. 2 is the schematic diagram of reservoir distribution in the embodiment of the present application;
Fig. 3 is an example of the first curve in the embodiment of the present application;
Fig. 4 is an example of the embodiment of the present application oil well output and temperature in wellbore.
Specific embodiment
The embodiment of the present application provides a kind of method for developing high pour point oil reservoir.
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common The application protection all should belong in technical staff's every other embodiment obtained without creative efforts Range.
Fig. 1 is the flow chart of method one embodiment that the application develops high pour point oil reservoir.As shown in Figure 1, shown method May include:
S101: obtaining the sample of geologic information, well-log information and target area oil reservoir fluid, obtains the oil reservoir storage The distribution of layer, determines the geologic feature of the target area and the chemical composition and attribute of the reservoir fluid;Described in drafting First curve of target area reservoir fluid.
Available geologic information, the geologic information may include: the corresponding reservoir distribution feature of oil reservoir.
Well-log information can also be obtained.The ground of the target area can be determined according to the geologic information and well-log information Matter feature.The geologic feature may include: oil area, oil-water interfaces information, permeability and porosity.
The sample of available target area oil reservoir fluid, and obtain the distribution of the oil reservoir.The oil reservoir It is continuously distributed that the distribution of reservoir can be oil reservoir gas-bearing formation, it is also possible to oil reservoir gas-bearing formation cross-distribution.Fig. 2 is reservoir point in the application The schematic diagram of cloth.(a) describes the continuously distributed oil reservoir of oil reservoir gas-bearing formation in Fig. 2, (b) describes oil reservoir gas-bearing formation intersection The oil reservoir of distribution.
The attribute of the reservoir fluid may include: freezing point, paraffin content and/or wax precipitation point.The attribute of the fluid is also It may include fluid viscosity, fluid permeability.According to the attribute of the reservoir fluid, the target area reservoir stream can be drawn First curve of body.
First curve can be the curve of viscosity and vs. temperature for describing the reservoir fluid.Fig. 3 It is an example of the first curve in the application embodiment of the method.In Fig. 3, what abscissa indicated is temperature, and unit is degree Celsius (℃);What ordinate indicated is viscosity, and unit is mpas (mPa*s).
Further, the method can also include: to judge whether the oil reservoir of the target area meets the first default item Part.First preset condition may include at least one of following: (1) having continuous or segmentation reservoir, and include Gas-bearing formation;(2) pressure of gas-bearing formation is greater than the pressure of oil reservoir;(3) reserves of gas-bearing formation are greater than the reserves of oil reservoir;(4) gas-bearing formation is located at oil reservoir Lower section or gas-bearing formation and oil reservoir cross-distribution.
S102: production method corresponding with the distribution of the oil reservoir of the target area is determined according to the geologic information.
Production method corresponding with the distribution of the oil reservoir of the target area can be determined according to the geologic information.Institute State the purpose of horizon that production method may include: determining perforation, perforating depth and shot density.
Specifically, the production method may include: that oil reservoir can be penetrated out all.Further, the generating mode is also It may include: that gas-bearing formation can be with partial penetrating, alternatively, reducing the shot density of the gas-bearing formation.For example, the 1 of gas-bearing formation can only be penetrated out ~2 meters, alternatively, the shot density of the gas-bearing formation can be reduced to 8 holes/rice, alternatively, can be by the shot density of the gas-bearing formation It is reduced to 8 holes/rice.
By selecting suitable production method, the production capacity of oil reservoir and gas-bearing formation can be made to be optimized and be maximized.
S103: testing the oil well of target area, obtains the test result under different production systems.
It is tested by the oil well to target area, the test result under available difference production method.The survey Test result may include: the thermo parameters method situation of pit shaft, the distribution of the pressure of pit shaft, the life of wellhead temperature, well head pressure and well Production capacity power.
The difference production system may include: different choke sizes and/or different production durations.
Table 1 is the generation system of oil well in the application and an example of test result.
Table 1
It is possible to further analyze the test result.It, can be with by analyzing the result of the test The reasonability of production method in judgment step S102, and can decide whether the necessity with adjustment production method.
S104: the best production system of the target area oil well is determined according to the first curve of the target area fluid Degree carries out the exploitation of high pour point oil reservoir using the best production system to above-mentioned target area.
The best production system of the target area oil well is determined according to the viscosity temperature curve of the target area fluid Degree can use the exploitation that the best production system carries out high pour point oil reservoir to above-mentioned target area.
The best producer system can make the mixed oil and gas temperature for giving rise to ground be higher than freezing point, keep good Mobility, the collection convenient for ground it is defeated and processing.
Further, the method can also include: to carry out real-time monitoring to the first state of the target area oil well;
The first state may include: oily well yield, the production gas-oil ratio of oil well, the moisture content of oil well fluid, well Mouth temperature and/or well head pressure etc..
Fig. 4 is an example of the application oil well output and temperature in wellbore.In figure, abscissa indicates oil yield, and unit is Bucket oil/day.
Further, the method can also include: according to the real-time monitoring result to determine whether needing to change life Production mode.Such as, if needs penetrate out other gas-bearing formations to maintain the production of oil well.
In practical recovery process, after one period of oil reservoir development, when the yield of gas-bearing formation is unable to satisfy lifting, Ke Yixuan It selects artificial gas injection lifting or thermal recovery mode further produces.Such as it can be in conjunction with oil recovery by heating, carbon dioxide flooding, chemical flooding etc. Method is exploited.
Using natural gas lift method in situ, it on the one hand can use the spontaneous gas-bearing formation of reservoir and come for the high production supplement for coagulating oil Energy avoids high solidifying oil degassing;On the other hand, natural gas is dissolved in high solidifying oil, can improve the high oil product for coagulating oil, is reduced solidifying The problem of solid point reduces the high viscosity for coagulating oil, can slow down high solidifying oil analysis wax.
The temperature and pressure of pit shaft can be maintained at one by a kind of high pour point oil reservoir recovery method provided by the above embodiment A higher level, it is defeated convenient for the collection to oil gas and processing operates.The cost for greatly reducing operation has reached economic height The purpose of effect exploitation high pour point oil reservoir.Meanwhile reservoir damage can be effectively avoided the problem that using natural gas lift method in situ, The recovery ratio of primary oil recovery can be greatly improved, convenient for the adjustment of subsequent production measure.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.
Although depicting the application by embodiment, it will be appreciated by the skilled addressee that the application there are many deformation and Variation is without departing from spirit herein, it is desirable to which the attached claims include these deformations and change without departing from the application's Spirit.

Claims (9)

1. a kind of method for developing high pour point oil reservoir characterized by comprising
The sample for obtaining geologic information, well-log information and target area oil reservoir fluid, obtains the distribution of the oil reservoir, Determine the geologic feature of the target area and the chemical composition and attribute of the reservoir fluid;Draw the target area storage First curve of layer fluid;
Production method corresponding with the distribution of the oil reservoir of the target area, the producer are determined according to the geologic information Formula comprises determining that the purpose of horizon, perforating depth and shot density of perforation;
The oil well of target area is tested, the test result under different production systems is obtained;
The best production system that the target area oil well is determined according to the first curve of the target area, using it is described most Good production system carries out the exploitation of high pour point oil reservoir to above-mentioned target area.
2. a kind of method for developing high pour point oil reservoir as described in claim 1, which is characterized in that first curve includes: For describing the viscosity of the reservoir fluid and the curve of vs. temperature.
3. a kind of method for developing high pour point oil reservoir as described in claim 1, which is characterized in that the geologic feature includes: Oil area, oil-water interfaces information, permeability and porosity.
4. a kind of method for developing high pour point oil reservoir as described in claim 1, which is characterized in that the distribution of the oil reservoir It include: that oil reservoir gas-bearing formation is continuously distributed, or, oil reservoir gas-bearing formation cross-distribution.
5. a kind of method for developing high pour point oil reservoir as described in claim 1, which is characterized in that the attribute of the reservoir fluid It include: freezing point, paraffin content and/or wax precipitation point.
6. a kind of method for developing high pour point oil reservoir as described in claim 1, which is characterized in that the difference production system packet It includes: different choke sizes and/or different production durations.
7. a kind of method for developing high pour point oil reservoir as described in claim 1, which is characterized in that the test result includes: Thermo parameters method situation, the distribution of the pressure of pit shaft, wellhead temperature, well head pressure and the capacity of well of pit shaft.
8. a kind of method for developing high pour point oil reservoir as described in claim 1, which is characterized in that the method also includes: it is right The first state of the target area oil well carries out real-time monitoring.
9. a kind of method for developing high pour point oil reservoir as claimed in claim 8, which is characterized in that the first state includes: Oily well yield, the production gas-oil ratio of oil well, the moisture content of oil well fluid, wellhead temperature and/or well head pressure.
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Publication number Priority date Publication date Assignee Title
CN107630688B (en) * 2017-11-09 2020-06-02 中国石油大港油田勘探开发研究院 Novel technical evaluation method for dilution-doping cold recovery of high-pour-point oil reservoir stratum
CN110714749A (en) * 2019-11-11 2020-01-21 西安石油大学 High-pour-point oil reservoir productivity evaluation method considering influence of pressure on viscosity
CN112465218B (en) * 2020-11-25 2024-03-12 中海石油(中国)有限公司 Offshore thin interbed sandstone oilfield layer system division and perforation scheme optimization method

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