CN115544909B - Equivalent seepage flow method for determining thickness of large-thickness oil reservoir with open top - Google Patents
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Abstract
The invention discloses an equivalent seepage flow resistance method for determining the thickness of a large and thick oil reservoir with an opened top, which comprises the following steps: calculating daily average output q of oil well according to production dynamic parameter, oil well and fluid basic parameter t Viscosity μ of fluid t The method comprises the steps of carrying out a first treatment on the surface of the According to daily average output q of oil well t Viscosity μ of fluid t Calculating the equivalent seepage resistance height h; obtaining the thickness h of a main development force layer of the oil well penetrating through the oil reservoir according to drilling data d The method comprises the steps of carrying out a first treatment on the surface of the According to the equivalent seepage resistance height h and the thickness h of the oil well drilling through the oil reservoir development main force layer d And calculating to obtain the thickness H of the large-thickness oil reservoir with the open top. The invention determines a calculation method suitable for the thickness of a large and thick oil reservoir with an open top based on a medium-value seepage flow resistance method of seepage mechanics, considers the influence of yield and bottom hole pressure in the actual production condition of an oil well, is beneficial to effectively judging the scale of the large and thick oil reservoir, and provides a reliable basis for the efficient development of the oil reservoir.
Description
Technical Field
The invention relates to an equivalent seepage flow resistance method for determining the thickness of a large and thick oil deposit reservoir with an opened top, and belongs to the technical fields of oil and gas field development and oil deposit engineering.
Background
The China is in a high-speed development period of social economy, the China is used as a large country of manufacturing industry, the physical economy development is not separated from the energy source, the petroleum energy source is significant for the development of China, and the rice bowl of the energy source is required to be firmly held in the hands of the China. In the oil reservoirs which are put into development in China at present, the large-thickness oil reservoirs occupy a certain proportion and become the main force of oil exploitation more and more. The large-thickness oil reservoir comprises rock types such as carbonate rock, volcanic rock, sandstone of large-thickness sand body and the like, and is usually drilled on the top, has the characteristics of large thickness, high reserve and strong heterogeneity, has great significance for improving the petroleum yield in China, and is a difficult problem to be solved in the petroleum field how to reasonably and effectively develop the oil reservoir. The thickness of the reservoir refers to the vertical distance from the bottom boundary of the reservoir to the top boundary of the reservoir, and is a critical parameter for efficiently developing a large-thickness reservoir and judging the size of the reservoir, researching the reservoir and managing the production.
In recent ten years, many scholars fully combine the geological features of oil reservoirs and the dynamic features of oil well production, and research the dynamic change rule of oil-water interfaces of the oil reservoirs by adopting the technical means such as a statistical analysis method, a material balance method, a numerical simulation method and the like, so that some achievements and knowledge are obtained, but the calculation problem of the thickness of the reservoir is not specially researched. The existing reservoir thickness calculation method mainly comprises a statistical method and a shaft temperature profile pushing algorithm. The statistical method needs to count wells with known reservoir thickness, count the relation between the height of the oil and gas reservoir oil column and geologic structure characteristic parameters such as the distance between the ring source and the elevation difference of the ring source, and return the empirical calculation formula of the reservoir thickness and the parameters. And (3) a shaft temperature profile pushing algorithm, and a method for obtaining the thickness of the reservoir by regression by using shaft temperature profile test data. However, the above methods have obvious disadvantages that the statistical method needs to do a great deal of statistical work, and the obtained empirical calculation method can only be used for counting blocks; the wellbore temperature profile calculation method needs to carry out on-site wellbore temperature profile test, and on-site test work not only increases the development cost of an oil field, but also affects normal production of an oil well, so that an actual oil reservoir only selects a few typical wells to carry out wellbore temperature profile test, and further, the reservoir thickness parameter values of most wells which are not subjected to temperature profile test cannot be obtained; the numerical simulation method has the following defects: firstly, the method needs to establish a dynamic numerical model of oil well production, on one hand, the simulation result and the actual calculation result have certain deviation because the existing numerical simulation model does not consider the influence of gravity, and on the other hand, the model parameters cause strong multi-solution of the simulation result; and secondly, calculating that the thickness of the reservoir is smaller than the geological thickness of the reservoir by using the simulated dynamic oil-water interface position. Thus, for large thick reservoirs with open tops, a dynamic, more simple reservoir thickness determination method is needed.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides an equivalent seepage flow resistance method for determining the thickness of a large and thick oil reservoir with an open top, which can conveniently, quickly and reliably determine the thickness of the large and thick oil reservoir.
The technical scheme provided by the invention for solving the technical problems is as follows: an equivalent seepage flow method for determining the thickness of a large thick oil reservoir with an open top, comprising the steps of:
step S10, calculating daily average output q of the oil well according to the production dynamic parameters, the oil well and the fluid basic parameters t Viscosity μ of fluid t ；
Step S20, according to the daily average output q of the oil well t Viscosity μ of fluid t Calculating the equivalent seepage resistance height h;
wherein: h is the equivalent seepage height, m; p (P) RA Is the bottom boundary pressure of the oil column, mpa; p (P) wf Is the bottom hole flow pressure, mpa; q t For daily average production of oil well, m 3 /d；μ t Is the fluid viscosity, cP; k is the permeability of the oil reservoir, mD; r is (r) w Is the well radius, m; ρ 0 Is the density of crude oil, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the B is the drain width, m; l is the leakage length, m;
s30, obtaining the thickness h of the oil well through oil reservoir development main force layer according to the drilling data d ；
Step S40, according to the equivalent seepage resistance height h, the thickness of the oil well drilling through the oil reservoir development main force layerh d And calculating to obtain the thickness H of the large-thickness oil reservoir with the open top.
Further technical proposal is that the production dynamic parameters comprise daily average oil yield q o Daily average water yield q w Daily average gas yield q g 。
The further technical scheme is that the oil well and fluid basic parameters comprise oil reservoir pressure, crude oil volume coefficient, water volume coefficient, gas volume coefficient, crude oil viscosity, bottom hole flow pressure, well radius, permeability and crude oil density.
Further technical proposal is that the daily average output q of the oil well t The calculation formula of (2) is as follows:
q t ＝q w B w +q o B 0 +q g B g
wherein: q t For daily average production of oil well, m 3 /d；q g For daily average gas production, m 3 /d；q w For daily average water yield, m 3 /d；q o For daily average oil production, m 3 /d；B w Is the volume coefficient of water; b (B) o Is the volume coefficient of crude oil; b (B) g Is the volume coefficient of the gas.
Further technical proposal is that the viscosity mu of the fluid t The calculation formula of (2) is as follows:
μ t ＝μ o (1-f w )+μ w f w
wherein: mu (mu) t Is the fluid viscosity, cP; mu (mu) o Viscosity of crude oil, cP; q w For daily average water yield, m 3 /d；q o For daily average oil production, m 3 /d。
The further technical scheme is that the calculation formula in the step S40 is as follows:
H＝h+h d
wherein: h is the equivalent seepage height,m；h d developing the thickness, m, of the primary force layer for the well to drill through the reservoir; h is the thickness of the large thick oil reservoir layer with the top open, and m.
The invention has the following beneficial effects: the invention determines a calculation method suitable for the thickness of a large and thick oil reservoir with an open top based on a medium-value seepage flow resistance method of seepage mechanics, considers the influence of yield and bottom hole pressure in the actual production condition of an oil well, is beneficial to effectively judging the scale of the large and thick oil reservoir, and provides a reliable basis for the efficient development of the oil reservoir.
Drawings
FIG. 1 is a diagram of a cuboid fracture-cavity drainage fluid model of a broken solution reservoir distributed along a large fracture zone;
FIG. 2 is a schematic diagram of the zone I and zone II seepage resistances of crude oil in the bleed during seepage.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention discloses an equivalent seepage flow resistance method for determining the thickness of a large and thick oil reservoir with an open top, which comprises the following steps:
step S10, according to the production dynamic parameters (daily average oil yield q o Daily average water yield q w Daily average gas yield q g ) The daily average output q of the oil well is calculated by the oil well and the fluid basic parameters (oil reservoir pressure, crude oil volume coefficient, water volume coefficient, gas volume coefficient, crude oil viscosity, bottom hole flow pressure, well radius, permeability and crude oil density) t Viscosity μ of fluid t ；
q t ＝q w B w +q o B 0 +q g B g
Wherein: q t For daily average production of oil well, m 3 /d；q g For daily average gas production, m 3 /d；q w For daily average water yield, m 3 /d；q o For daily average oil production, m 3 /d；B w Is the volume coefficient of water; b (B) o Is the volume coefficient of crude oil; b (B) g Is the volume coefficient of the gas;
μ t ＝μ o (1-f w )+μ w f w
wherein: mu (mu) t Is the fluid viscosity, cP; mu (mu) o Viscosity of crude oil, cP; q w For daily average water yield, m 3 /d；q o For daily average oil production, m 3 /d；
Step S20, according to the daily average output q of the oil well t Viscosity μ of fluid t Calculating the equivalent seepage resistance height h;
wherein: h is the equivalent seepage height, m; p (P) RA Is the bottom boundary pressure of the oil column, mpa; p (P) wf Is the bottom hole flow pressure, mpa; q t For daily average production of oil well, m 3 /d；μ t Is the fluid viscosity, cP; k is the permeability of the oil reservoir, mD; r is (r) w Is the well radius, m; ρ 0 Is the density of crude oil, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the B is the drain width, m; l is the leakage length, m;
s30, obtaining the thickness h of the oil well through oil reservoir development main force layer according to the drilling data d ；
S40, according to the equivalent seepage resistance height h, the thickness h of the oil well drilling through oil reservoir development main force layer d Calculating to obtain the thickness H of the large-thickness oil reservoir with the open top;
H＝h+h d
wherein: h is the equivalent seepage height, m; h is a d Is a wellDrilling through the thickness m of the oil reservoir development main force layer; h is the thickness of the large thick oil reservoir layer with the top open, and m.
According to geological data, a cuboid drainage fluid model with an open top and a large-thickness reservoir is established, and the drainage fluid is controlled by the drainage length L=500m, the drainage width B=300m and the equivalent seepage height h, as shown in figure 1;
innovative definition of seepage resistance of crude oil in large-thickness oil deposit drainage fluid with open top in seepage process as seepage resistance of zone I and seepage resistance of zone II, as shown in figure 2;
the seepage resistance of the area I is the resistance R of crude oil in the process of flowing from the bottom boundary of an oil reservoir to the bottom of the well Ⅰ ；
μ t ＝μ o (1-f w )+μ w f w
Wherein: mu (mu) t Is the fluid viscosity, cP; mu (mu) o Viscosity of crude oil, cP; f (f) w Water content,%; mu (mu) w Is the viscosity of the formation water, cP; h is the equivalent seepage height, m; k is the permeability of the oil reservoir, mD; b is the drain width, m; l is the leakage length, m.
The seepage resistance of the II area is the resistance R in the radial flow process from the crude oil to the perforation section of the shaft Ⅱ ；
Wherein: r is (r) w Is the radius of the well bore, m.
And writing a seepage oil production formula according to seepage pressure difference = seepage intensity (yield) x seepage resistance and considering the influence of gravity:
q t ＝q w B w +q o B 0 +q g B g
wherein: PRA is reservoir pressure, mpa; p (P) wf Is the bottom hole flow pressure, mpa; q t Oil well output, m 3 /d；q w For water yield, m 3 /d；q o For oil production, m3/d; q g For gas production, m 3 /d；B w Is the water volume coefficient; b (B) o Is the volume coefficient of crude oil; b (B) g Is the gas volume coefficient.
The two-region resistance is substituted into the seepage oil equation to obtain the output q t ：
And (3) performing term transfer and unit conversion on the seepage oil production equation to obtain an equivalent seepage height h:
wherein: h is the equivalent seepage height, m; p (P) RA Is the bottom boundary pressure of the oil column, mpa; p (P) wf Is the bottom hole flow pressure, mpa; q t For daily average production of oil well, m 3 /d；μ t Is the fluid viscosity, cP; k is the permeability of the oil reservoir, mD; r is (r) w Is the well radius, m; ρ 0 Is the density of crude oil, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the B is the drain width, m; l is the leakage length, m.
Examples
Step one, according to X1 well production dynamic data, daily average values of all production are shown in table 1, and daily average production of an oil well is calculated;
q t ＝q w B w +q o B 0 +q g B g
＝112.6×2.1251+0.23×1+49884×10 -3
＝289.40026m 3 /d
step two, calculating the viscosity of the fluid;
μ t ＝0.26×(1-0.204)+1.1×0.204＝0.4314cP
step three, substituting the obtained data and basic parameters to calculate the equivalent seepage resistance height;
step four, arranging drilling data to obtain the thickness=21m of the primary oil reservoir development force layer of the X1 well drilling through;
step five, adding the equivalent seepage resistance height h to the thickness of the oil well drilling through oil deposit development main force layer to obtain the thickness of the large and thick oil deposit reservoir with the open top;
H＝h+h d ＝516.8744+21＝537.8324m
from this, it was determined that the X1 well reservoir thickness was 537.8324m.
TABLE 1X1 well production dynamic tables
Table 2X1 well oil well and fluid base parameter table
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any person skilled in the art can make some changes or modifications to the equivalent embodiments without departing from the scope of the technical solution of the present invention, but any simple modification, equivalent changes and modifications to the above-mentioned embodiments according to the technical substance of the present invention are still within the scope of the technical solution of the present invention.
Claims (4)
1. An equivalent seepage flow method for determining the thickness of a large thick oil reservoir with an open top, comprising the steps of:
step S10, calculating daily average output q of the oil well according to the production dynamic parameters, the oil well and the fluid basic parameters t Viscosity μ of fluid t ；
Step S20, according to the daily average output q of the oil well t Viscosity μ of fluid t Calculating the equivalent seepage resistance height h;
wherein: h is the equivalent seepage resistance height and the measurement unit m; p (P) RA Is the bottom boundary pressure of the oil column, and the unit of measurement is Mpa; p (P) wf Is the bottom hole flow pressure, and measures the unit Mpa; q t For daily average production of oil well, unit of measurement m 3 /d；μ t Is the fluid viscosity, the unit of measure cP; k is the permeability of the oil reservoir and the measurement unit mD; r is (r) w Is the well radius measurement unit m; ρ 0 Is the density of crude oil, the unit of measurement g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the B is the discharge width and the measurement unit m; l is the leakage length and the measurement unit m;
s30, obtaining the thickness h of the oil well through oil reservoir development main force layer according to the drilling data d ；
S40, according to the equivalent seepage resistance height h, the thickness h of the oil well drilling through oil reservoir development main force layer d Calculating to obtain the thickness H of the large-thickness oil reservoir with the open top;
the production dynamic parameters comprise daily average oil yield q o Daily average water yield q w Daily average gas yield q g ；
The oil well and fluid base parameters include reservoir pressure, crude oil volume coefficient, water volume coefficient, gas volume coefficient, crude oil viscosity, bottom hole flow pressure, well radius, permeability, crude oil density.
2. The method of equivalent seepage flow for determining the thickness of an open-topped heavy and oil reservoir of claim 1, wherein said daily average production rate q of said well t The calculation formula of (2) is as follows:
q t ＝q w B w +q o B 0 +q g B g
wherein: q t For daily average production of oil well, unit of measurement m 3 /d；q g For daily average gas production, m 3 /d；q w The daily average water yield is measured in m 3 /d；q o For daily average oil production, unit of measurement m 3 /d；B w Is the volume coefficient of water; b (B) o Is the volume coefficient of crude oil; b (B) g Is the volume coefficient of the gas.
3. An equivalent seepage flow for determining the thickness of an open-topped heavy oil reservoir according to claim 1, wherein the fluid viscosity μ t The calculation formula of (2) is as follows:
μ t ＝μ o (1-f w )+μ w f w
wherein: mu (mu) t Is the fluid viscosity, the unit of measure cP; mu (mu) o The viscosity of crude oil is measured in cP; q w The daily average water yield is measured in m 3 /d；q o For daily average oil production, unit of measurement m 3 /d；f w The water content is measured in units; mu (mu) w Is the formation water viscosity, measured in cP.
4. The method of equal permeability flow resistance for determining the thickness of an open-topped heavy oil reservoir according to claim 1, wherein the calculation formula in step S40 is:
H＝h+h d
wherein: h is the equivalent seepage resistance height and the measurement unit m; h is a d The thickness of a main force layer is developed for oil well drilling through an oil reservoir, and the unit of measurement is m; h is the thickness of the large-thickness oil reservoir with the open top, and the unit of measurement is m.
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