CN115544909A - Equivalent seepage resistance method for determining thickness of large-thick oil reservoir with open top - Google Patents
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Abstract
The invention discloses an equivalent seepage resistance method for determining the thickness of a large thick oil reservoir with an open top, which comprises the following steps: respectively calculating daily average output q of the oil well according to the dynamic production parameters, the oil well and the fluid basic parameters t Fluid viscosity, mu t (ii) a According to daily average output q of oil well t Fluid viscosity, mu t Calculating the equivalent seepage resistance height h; obtaining the thickness h of the oil well drilling through reservoir development main force layer according to the drilling data d (ii) a According to the equivalent seepage resistance height h and the thickness h of the oil well drilling through reservoir development main power layer d And calculating to obtain the thickness H of the large thick oil reservoir with the top opened. The invention is based on the equivalent seepage resistance method in seepage mechanics to determineThe invention relates to a method for calculating the thickness of a reservoir of a large and thick oil reservoir with an open top, which considers the influences of yield and bottom hole pressure in the actual production condition of an oil well, is favorable for 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 resistance method for determining the thickness of a large thick oil reservoir with an open top, belonging to the technical field of oil and gas field development and oil reservoir engineering.
Background
In the period of social and economic high-speed development, big and thick oil reservoirs account for a certain proportion in oil reservoirs which are put into development in China at present and become more and more the main force of oil exploitation. The large and thick oil deposit comprises carbonate rocks, volcanic rocks, sandstone and other rock mass types of large and thick sand bodies, usually only the top is drilled, and the large and thick oil deposit has the characteristics of large thickness, high storage capacity and strong heterogeneity, has great significance for improving the petroleum yield of China, and how to reasonably and effectively develop the oil deposit becomes a difficult problem to be solved urgently in the petroleum field. The reservoir thickness is the vertical distance from the bottom boundary to the top boundary of the oil reservoir in the oil reservoir, and is a crucial parameter for efficiently developing large and thick oil reservoirs, judging the scale of the oil reservoir, and researching and managing the oil reservoir.
In the last decade, many scholars fully combine the geological characteristics of an oil reservoir and the dynamic characteristics of oil well production, and research the dynamic change rule of an oil-water interface of the oil reservoir by adopting technical means such as a statistical analysis method, a material balance method and a numerical simulation method, so that some achievements and understanding are obtained, but the problem of calculating the thickness of the reservoir is not specially researched. The existing reservoir thickness calculation method mainly comprises a statistical method and a wellbore temperature profile deduction algorithm. The statistical method needs to count wells with known reservoir thickness, count the relationship between the height of an oil column of an oil-gas reservoir and the geologic structure characteristic parameters such as the distance between a ring source and the height difference between the ring source and the like, and regress an empirical calculation formula of the reservoir thickness and the parameters. The wellbore temperature profile deduction algorithm is a method for solving the thickness of a reservoir stratum by performing regression by using wellbore temperature profile test data. However, the above methods have obvious disadvantages, the statistical method needs to do a lot of statistical work, and the obtained empirical calculation formula can only be used for counting blocks; the well bore temperature profile deduction algorithm needs to carry out on-site well bore temperature profile testing, and on-site testing work not only increases oil field development cost but also influences normal production of an oil well, so that only a few typical wells are selected for carrying out the well bore temperature profile testing in actual oil deposit, and further, for most wells which are not carried out with the temperature profile testing, reservoir thickness parameter values of the most wells cannot be obtained; the numerical simulation method has the following disadvantages: firstly, the method needs to establish an oil well production dynamic numerical model, on one hand, the influence of gravity is not considered in the existing numerical simulation model, so that a certain deviation exists between a simulation result and an actual calculation result, and on the other hand, the model parameters are more, so that the multi-solution performance of the simulation result is strong; and secondly, calculating that the thickness of the reservoir is smaller than the geological thickness of the reservoir by utilizing the simulated dynamic oil-water interface position. Therefore, for large thick reservoirs with open tops, a dynamic, simpler 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 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 reservoir.
The technical scheme provided by the invention for solving the technical problems is as follows: an isoosmotic flow resistance method for determining the thickness of a large thick reservoir with an open top, comprising the steps of:
step S10, respectively calculating daily average output q of the oil well according to the production dynamic parameters and the basic parameters of the oil well and the fluid t Viscosity of fluid mu t ；
Step S20, according to daily average output q of the oil well t Viscosity of fluid mu t Calculating the equivalent seepage resistance height h;
in the formula: h is the equivalent seepage height m; p RA The pressure is the bottom boundary pressure of the oil column, mpa; p wf Is the bottom hole flow pressure, mpa; q. q.s t Average daily output of oil well, m 3 /d；μ t Fluid viscosity, cP; k is reservoir penetrationRate, mD; r is w Is the well radius, m; rho 0 Is crude oil density, g/cm 3 (ii) a B is the discharge width m; l is the length of the drainage, m;
s30, obtaining the thickness h of the oil well drilling through oil reservoir development main power layer according to the drilling data d ；
S40, according to the equivalent seepage resistance height h and the thickness h of the oil well drilling through oil reservoir development main power layer d And calculating to obtain the thickness H of the large thick oil reservoir with the top opened.
The further technical proposal is that the production dynamic parameters comprise daily average oil production q o Daily average water yield q w Daily average gas production q g 。
The further technical scheme is that the oil well and fluid basic parameters comprise oil deposit pressure, volume coefficient of crude oil, volume coefficient of water, volume coefficient of gas, viscosity of crude oil, bottom hole flowing pressure, well radius, permeability and density of crude oil.
The 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
in the formula: q. q.s t Average daily output of oil well, m 3 /d；q g Is the daily average gas production, m 3 /d；q w M is the daily average water production 3 /d；q o Is the daily average oil production, m 3 /d；B w Is the volume coefficient of water; b is o Is the volume coefficient of the crude oil; b is g Is the volume factor of gas.
The 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
in the formula: mu.s t Is a streamBulk viscosity, cP; mu.s o Crude oil viscosity, cP; q. q.s w M is the daily average water production 3 /d； q o Is the daily average oil production, m 3 /d。
The further technical solution is that the calculation formula in step S40 is:
H＝h+h d
in the formula: h is the equivalent seepage height m; h is a total of d The thickness of the main power layer, m, for well drilling through the reservoir development; h is the thickness of the large thick oil reservoir with the top opened, and m is the thickness of the large thick oil reservoir with the top opened.
The invention has the following beneficial effects: the invention determines a calculation method of the reservoir thickness of the large and thick oil reservoir suitable for top opening based on the equivalent seepage resistance method in seepage mechanics, and the invention considers the influence of yield and bottom hole pressure in the actual production condition of an oil well, thereby being beneficial to effectively judging the scale of the large and thick oil reservoir and providing reliable basis for the efficient development of the oil reservoir.
Drawings
FIG. 1 is a diagram of a cuboid fracture-cavity fluid drainage model of a fractured solution reservoir distributed along a large fractured zone;
FIG. 2 is a schematic diagram of the seepage resistance in zone I and the seepage resistance in zone II of crude oil in a bleed fluid during seepage.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses an equivalent seepage resistance method for determining the thickness of a large thick oil reservoir with an opened top, which comprises the following steps of:
step S10, according to the production dynamic parameter (daily average oil production q) o Daily average water yield q w Daily average gas production q g ) Well and fluid base parameters (reservoir pressure, volume factor of crude oil, volume factor of water)Gas volume coefficient, crude oil viscosity, bottom hole flowing pressure, well radius, permeability and crude oil density) respectively calculating daily average output q of the oil well t Fluid viscosity, mu t ；
q t ＝q w B w +q o B 0 +q g B g
In the formula: q. q.s t Average daily output of oil well, m 3 /d；q g Is the average daily gas production, m 3 /d；q w Is the daily average water production, m 3 /d；q o Is the daily average oil production, m 3 /d；B w Is the volume coefficient of water; b o Is the volume factor of the crude oil; b is g Is the volume factor of gas;
μ t ＝μ o (1-f w )+μ w f w
in the formula: mu.s t Fluid viscosity, cP; mu.s o Crude oil viscosity, cP; q. q.s w Is the daily average water production, m 3 /d； q o Is the daily average oil production, m 3 /d；
Step S20, average daily output q of the oil well t Viscosity of fluid mu t Calculating the equivalent seepage resistance height h;
in the formula: h is the equivalent seepage height m; p RA The pressure is the bottom boundary pressure of the oil column, mpa; p is wf The bottom hole flowing pressure is Mpa; q. q.s t Average daily output of oil well, m 3 /d；μ t Fluid viscosity, cP; k is the reservoir permeability, mD; r is a radical of hydrogen w Is the well radius, m; ρ is a unit of a gradient 0 Is crude oil density, g/cm 3 (ii) a B is the discharge width m; l is the discharge length m;
step S30, obtaining the drilling dataThickness h of oil well drilling through reservoir development main power layer d ；
S40, according to the equivalent seepage resistance height h and the thickness h of the oil well drilling through oil reservoir development main power layer d Calculating to obtain the thickness H of the large thick oil reservoir with the opened top;
H＝h+h d
in the formula: h is the equivalent seepage height m; h is a total of d The thickness of the main power layer, m, for well drilling through the reservoir development; h is the thickness of the large thick oil reservoir with the top opened, and m is the thickness of the large thick oil reservoir with the top opened.
According to geological data, a cuboid drainage model of a large and thick oil reservoir with an opened top is established, and drainage is controlled by drainage length L =500m, drainage width B =300m and equivalent seepage height h, as shown in FIG. 1;
innovative definition of seepage resistance of crude oil in a large and thick oil reservoir leakage fluid with an opened top in a seepage process is seepage resistance of a region I and seepage resistance of a region II, as shown in figure 2;
the seepage resistance of the I area is the resistance R of crude oil in the process of flowing from the bottom boundary of the oil reservoir to the bottom of the well Ⅰ ；
μ t ＝μ o (1-f w )+μ w f w
In the formula: mu.s t Fluid viscosity, cP; mu.s o Crude oil viscosity, cP; f. of w Water content,%; mu.s w Formation water viscosity, cP; h is the equivalent seepage height m; k is the reservoir permeability, mD; b is the discharge width m; l is the bleed length, m.
The seepage resistance of the II area is the resistance R in the radial flow process of crude oil to a perforation section of a shaft Ⅱ ；
In the formula: r is a radical of hydrogen w Is the wellbore radius, m.
And writing a seepage oil production formula according to the 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
in the formula: PRA is reservoir pressure, mpa; p is wf Is the bottom hole flow pressure, mpa; q. q.s t Oil well output, m 3 /d； q w M is water yield 3 /d；q o M3/d is oil production; q. q of g For gas production, m 3 /d；B w Is the water volume coefficient; b is o Is the volume coefficient of crude oil; b is g Is the gas volume coefficient.
Substituting the resistance of the two regions into a seepage oil production equation to obtain the output q t ：
Carrying out item transfer and unit conversion on a seepage oil production equation to obtain an equivalent seepage height h:
in the formula: h is the equivalent seepage height m; p is RA The pressure is the bottom boundary pressure of the oil column, mpa; p wf Is the bottom hole flow pressure, mpa; q. q.s t Average daily output of oil well, m 3 /d；μ t Fluid viscosity, cP; k is the reservoir permeability, mD; r is a radical of hydrogen w Is the well radius, m; ρ is a unit of a gradient 0 Is crude oil density, g/cm 3 (ii) a B is the discharge width m; l is the bleed length, m.
Examples
Step one, according to X1 well production dynamic data, taking daily average values of all the production as shown in table 1, and calculating daily average output of an oil well;
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
substituting the obtained data and the basic parameters to calculate the equivalent seepage resistance height;
step four, well drilling data are arranged, and the thickness =21m of the X1 well drilling through oil reservoir development main power layer is obtained;
step five, adding the equivalent seepage resistance height h to the thickness of a main force layer of oil well drilling-through oil reservoir development to obtain the thickness of a large-thickness oil reservoir with an opened top;
H＝h+h d ＝516.8744+21＝537.8324m
thus, the X1 well reservoir thickness was determined to be 537.8324m.
TABLE 1 X1 well production dynamics chart
TABLE 2X1 table of basic parameters of oil well and fluid
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (6)
1. An equivalent seepage resistance method for determining the thickness of a large thick oil reservoir with an open top is characterized by comprising the following steps of:
step S10, respectively 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 of fluid mu t ；
Step S20, average daily output q of the oil well t Viscosity of fluid mu t Calculating the equivalent seepage resistance height h;
in the formula: h is the equivalent seepage height m; p RA The pressure is the bottom boundary pressure of the oil column, mpa; p wf The bottom hole flowing pressure is Mpa; q. q.s t Average daily output of oil well, m 3 /d；μ t Fluid viscosity, cP; k is the reservoir permeability, mD; r is w Is the well radius, m; rho 0 Is crude oil density, g/cm 3 (ii) a B is the discharge width m; l is the discharge length m;
step S30, according toObtaining the thickness h of the oil well drilling through reservoir development main force layer by the drilling data d ；
S40, according to the equivalent seepage resistance height h and the thickness h of the oil well drilling through oil reservoir development main power layer d And calculating to obtain the thickness H of the large thick oil reservoir with the top opened.
2. The isoosmotic flow resistivity method for determining the thickness of a large and thick reservoir with an open top according to claim 1, wherein the production dynamic parameter comprises the daily average oil production q o Daily average water yield q w Daily average gas production q g 。
3. The method of claim 1, wherein the well and fluid base parameters include reservoir pressure, volume factor of crude oil, volume factor of water, volume factor of gas, viscosity of crude oil, bottom hole flow pressure, well radius, permeability, and crude oil density.
4. The isoosmotic flow resistance method for determining the thickness of a large thick reservoir with an open top according to claim 1, wherein the daily average output q of the well t The calculation formula of (2) is as follows:
q t ＝q w B w +q o B 0 +q g B g
in the formula: q. q.s t Average daily output of oil well, m 3 /d；q g Is the daily average gas production, m 3 /d；q w Is the daily average water production, m 3 /d；q o Is the average daily oil production, m 3 /d；B w Is the volume coefficient of water; b is o Is the volume coefficient of the crude oil; b is g Is the volume factor of gas.
5. The isoosmotic flow resistance method for determining the thickness of a large-thick reservoir with an open top according to claim 1, wherein the fluid viscosity μ t Meter (2)The calculation formula is as follows:
μ t ＝μ o (1-f w )+μ w f w
in the formula: mu.s t Fluid viscosity, cP; mu.s o Crude oil viscosity, cP; q. q.s w Is the daily average water production, m 3 /d；q o Is the daily average oil production, m 3 /d。
6. The method for determining the equivalent seepage resistance of the top-opened large thick oil reservoir thickness according to claim 1, wherein the calculation formula in the step S40 is as follows:
H＝h+h d
in the formula: h is the equivalent seepage height m; h is d The thickness of the main power layer, m, for well drilling through the reservoir development; h is the thickness of the large thick oil reservoir with the top opened, and m is the thickness of the large thick oil reservoir with the top opened.
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