CN111382523B - New splitting method for yield of oil well - Google Patents
New splitting method for yield of oil well Download PDFInfo
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- CN111382523B CN111382523B CN202010189294.2A CN202010189294A CN111382523B CN 111382523 B CN111382523 B CN 111382523B CN 202010189294 A CN202010189294 A CN 202010189294A CN 111382523 B CN111382523 B CN 111382523B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G06Q50/02—Agriculture; Fishing; Mining
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
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Abstract
The invention provides a new method for splitting the yield of a synthetic oil production well, which comprises the following steps: step 1, determining the combined production Q of a first development layer 1 The method comprises the steps of carrying out a first treatment on the surface of the Step 2, calculating a first development layer small-layer yield contribution coefficient; step 3, calculating a first development layer small-layer average yield correction coefficient; step 4, calculating the initial yield and the final yield of the first development layer layered small layers; step 5, determining the initial yield and the final yield of the second development layer layered small layers; and 6, repeating the step 5, and determining the initial yield and the final yield of each layered small layer. The novel method for splitting the production of the oil recovery well greatly improves the splitting efficiency of the small-layer primary production of the oil recovery well, ensures the data closure, and provides a quick and effective technical support means for evaluating the small-layer recoverable reserves. Meanwhile, the method also considers two development modes of the combined well, and can be widely applied to the evaluation of the recoverable reserves of various combined wells.
Description
Technical Field
The invention relates to the field of petroleum recoverable reserves evaluation, in particular to a novel splitting method for the yield of a synthetic oil production well.
Background
The petroleum reservoir ascertained in China is mainly deposited on land, most of the petroleum reservoirs are deposited in multiple layers, and the characteristics of multiple petroleum reservoirs and thin single-layer thickness are obvious. In the development process of oil and gas reserves, in order to reach the lowest economic limit primiparity, the phenomenon of multi-small layer mining or later layer hole filling and combined mining of an oil well is very common, so that development data of small layers are difficult to split accurately, and calculation of the small layer recoverable reserves is extremely difficult. The current domestic more common yield splitting method splits the yield of each small layer according to the ratio of kh (product of permeability and thickness), but practical development data show that: the yield of the small layers is influenced by the physical property and the fluid property of the oil reservoir in many aspects, and the simple splitting mode has great difference from the actual development effect.
According to a single well productivity calculation formula: q o ＝J o ·Δp s ；J o Is the oil recovery index; Δp s To produce a pressure differential.
When the well sections of the co-production layers are close, the production pressure difference is basically consistent, and the first production can be split according to the ratio of the oil extraction indexes. The method for determining the oil extraction index mainly comprises the following steps: an oil test and production test method, a stable well test method, a theoretical formula method, an analogy method and the like.
The theoretical calculation formula of the oil extraction index is as follows:
k-absolute permeability of oil layer, 10 -3 μm 2 ；
k ro -relative permeability of oil, decimal;
h o -effective thickness of oil layer, m;
B o -formation crude oil volume coefficient, decimal;
r e -oil supply radius, m;
r w -wellbore radius, m;
μ o -formation crude oil viscosity, mpa.s;
s-skin factor, decimal.
The method considers the physical properties of oil layer and the influence of fluid property, so that the method is suitable for oil wells of oil reservoirs with different exploitation modes, has wide application, and needs to be corrected by trial exploitation and production data.
From the theoretical calculation formula: in crude oil physical properties (. Mu. o ，B o ) The ratio of the first production of the layers is positively correlated with the permeability of the layers, the thickness, the relative permeability of the oil (oil content) as well as the completion conditions (wellbore radius, skin factor, etc.), the production pressure differential are approached. The regression relationship between the initial production of a unit single production well and a plurality of oil reservoir parameters can be seen as follows: the initial yield is positively correlated with the reservoir thickness and permeability, and is negatively correlated with the initial water saturation and clay content (see fig. 2, 3, 4 and 5), but each single factor is not a major factor and has poor correlation.
In application number: 201910972695.2 relates to a method and a system for splitting the yield of a multi-layer gas production well, wherein the method comprises the following steps: establishing a comprehensive relation between annual layered production contribution rate of the gas layer components and logging interpretation parameters according to annual production profile test data and logging interpretation parameters of the single-well gas layer components; calculating the annual layered history average yield contribution rate of the gas layer components according to annual output profile test data of the single-well gas layer components; according to the annual layered historical average yield contribution rate of the gas layer components and the comprehensive relation between the annual layered yield contribution rate of the gas layer components and logging interpretation parameters, adopting a multiple linear regression algorithm to fit and determine the weight coefficient of each logging interpretation parameter in the comprehensive relation, and further determining the comprehensive relation between the annual layered yield contribution rate of the final gas layer components and the logging interpretation parameters; according to the comprehensive relation of the annual layered production contribution rate of the final gas layer component and logging interpretation parameters, reversely pushing to determine an annual layered production contribution rate calculation relational expression of the gas layer component; and splitting the single well production according to the annual production profile test data of the single well gas layer components and the annual layered production contribution rate calculation relation of the gas layer components determined by reverse thrust. For a well, it is not practical to conduct a stratified test during the production process to determine the production of each small layer. Firstly, the yield is affected, secondly, the layering is mostly smaller, and the layering test is technically unrealizable. The above method is not applicable to oil wells.
In application number: 201811526908.0 relates to an oil well layering yield splitting method based on dynamic and static coupling, which comprises the following steps: s100, determining a static splitting coefficient; resetting the single well perforation data according to the layering result, and generating a static splitting coefficient according to the single well logging interpretation result and the perforation thickness; s200, determining a splitting coefficient of a single well section; generating a profile splitting coefficient after layering and homing according to the profile data of the produced fluid; s300, determining a dynamic splitting coefficient according to the static splitting coefficient and the section splitting coefficient. The principle and the calculation process of the method are still complex, and parameters related to the yield such as the water saturation of the sub-layers, the clay content and the like are not considered in the calculation process. Nor is it explicitly stated on the overall closeness of the cleavage results to the actual data.
Therefore, the invention discloses a novel splitting method for the yield of the oil production well, and solves the technical problems.
Disclosure of Invention
The invention aims to provide a novel method for splitting the yield of a combined oil production well, which can lay a foundation for evaluating the split-layer recoverable reserves of an oil production well in a mine and provide support for the potential of excavating split-layer residual oil.
The aim of the invention can be achieved by the following technical measures: the new method for splitting the yield of the combined oil production well comprises the following steps: step 1, determining the combined production Q of a first development layer 1 The method comprises the steps of carrying out a first treatment on the surface of the Step 2, calculating a first development layer sub-layer yield contribution coefficient f P The method comprises the steps of carrying out a first treatment on the surface of the Step 3, calculating a first development layer small-layer average yield correction coefficient f ad The method comprises the steps of carrying out a first treatment on the surface of the Step 4, calculating the initial yield and the final yield of the first development layer layered small layers; step 5, determining the initial production and the final production of the second production layer sub-layers; and 6, repeating the step 5, and determining the initial yield and the final yield of each layered small layer.
The aim of the invention can be achieved by the following technical measures:
in step 2, parameters such as the thickness h, the permeability k, the original water saturation, the clay content and the like of each small layer in the development layer of the first development layer are determined according to the well logging interpretation result, and the contribution coefficient of the first development layer in the small layer yield is calculated.
In step 2, the calculation formula of the fractional yield contribution coefficient is:
yield contribution coefficient f P K (1-water saturation) 1-argillaceous content, if there is correlation between other reservoir parameters and yield, the correlation can be introduced by itself.
In step 3, formula f is used ad Calculation of first development layer stratified small-layer average yield correction coefficient f by =combined initial yield/Σ (stratified thickness. Stratified yield contribution coefficient) ad 。
In step 4, the formula q=h×f is used P *f ad The first development layer layered small layer primiparity Q can be calculated 1-1 、Q 1-2 、Q 1-3 … … and according to Q 1-1 、Q 1-2 、Q 1-3 … … is taken up of the first yield Q 1 Is used for determining the ratio of the first development layer to the small layer end product.
In step 5, the second production layer is used for hole filling and initial production Q after combined production 2 Subtracting the final production of the residual mining small layers of the first layer to obtain the initial production of the second production layer, and if the second production layer is a plurality of small layers, executing the steps 2-5 to obtain the initial production and final production of each small layer of the second production layer.
The novel splitting method for the yield of the combined oil production well has reference significance for reasonably splitting the split-level yield of the combined oil production well, and can realize reasonable evaluation of the single-layer recoverable reserves by fitting the well or simulating the same-layer progressive rate of other oil wells as long as the combined oil production well can reasonably split single-layer primiparity. The method is based on a theoretical formula, takes actual development experience as assistance, solves the problems of more related parameters, difficult value taking, complex calculation, required correction of results and the like of the theoretical formula in the initial production split by using a simplified processing mode of yield contribution coefficients and yield coefficients, greatly improves the efficiency of the combined well split in small layers, ensures the closure of data, and provides a quick and effective technical support means for evaluating the split-level recoverable reserves. Meanwhile, the method also considers two development modes of the combined well, and can be widely applied to the evaluation of the recoverable reserves of various combined wells.
Drawings
FIG. 1 is a flow chart of a method for splitting the yield of a synthetic oil production well according to the present invention;
FIG. 2 is a graph of the initial production versus reservoir thickness for a unit well according to an embodiment of the present invention;
FIG. 3 is a graph of the initial production versus permeability for a unit well according to an embodiment of the present invention;
FIG. 4 is a graph of the initial water saturation of a unit well according to an embodiment of the present invention;
FIG. 5 is a plot of the initial production versus the shale content of a unit well in accordance with an embodiment of the present invention.
Detailed Description
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
The invention summarizes theoretical calculation formulas and researches the relation between actual primiparity and various parameters of typical units, and establishes the concepts of yield contribution coefficient index and yield correction coefficient for splitting primiparity.
Yield contribution coefficient f P =k (1-water saturation) ×1-argillaceous content; if there are other reservoir parameters that correlate with production, it may also be added.
Yield correction coefficient f ad Yield contribution coefficient f =primiparity q/reservoir thickness h/yield P 。
The relationship of primiparity to each parameter can be expressed as: q=h×f P *f ad 。
There are generally two cases for a synthetic production well: one is a general well logging, namely, a plurality of small layers are shot at the same time to conduct combined mining at the initial stage of production; the second is hole-complement combined well, namely after a certain small layer is produced for a period of time, the yield is reduced, and other layers are complemented for improving the single well productivity for combined production. The first case can be considered as the initial stage of the second case, and the yield splitting method is the same as the combined mining stage processing method of the second case.
FIG. 1 is a flow chart of the new method for splitting the production of the oil recovery well. The aim of the invention can be achieved by the following technical measures:
And step 111, if the later layers of 3# and 4# … … are sequentially subjected to hole filling and combined mining, repeating the step 109.
The following is a specific embodiment of the invention, wherein the number 01 oil well has 4 oil-containing small layers, and the number 1, the number 2 and the number 3 small layers are adopted from 1 month in 2009 to 9 months in 2009; the 2009 month 9 supplement hole 6 small layer later is collected together to the present. The parameters of each small layer are shown in Table 1.
Table 1 statistics of parameters and production conditions of each small layer of oil well No. 01
The first step: using formula f P Calculating a 1# mined layer sub-layer yield contribution coefficient;
and a second step of: using formula f ad Calculating a 1# mining layer sub-layer average yield correction coefficient;
and a third step of: with the formula q=h×f P *f ad The 1# mining layer 1, 2 and 3 small layers are split for initial production, and the small layers are split and finally produced according to the proportion of the combined mining initial production.
Fourth step: and subtracting the end product of the No. 1 layer from the initial product of the No. 2 layer after the combined production of the No. 2 layer to obtain the initial product of the No. 2 production layer of 12.6t/d.
The yield split results are shown in Table 2.
Table 2 number 01 oil well each small layer yield splitting table
The method can ensure that the yield of each small layer is split more simply, conveniently and accurately under the condition of data closure, and is used for the next step of recoverable reserve evaluation.
Claims (1)
1. The novel splitting method for the yield of the oil production well is characterized by comprising the following steps:
step 1, determining the combined production Q of a first development layer 1 ；
Step 2, calculating a first development layer sub-layer yield contribution coefficient f P ；
Step 3, calculating a first development layer small-layer average yield correction coefficient f ad ；
Step 4, calculating the initial yield and the final yield of the first development layer layered small layers;
step 5, determining the initial yield and the final yield of the second production layer layered small layers;
step 6, repeating the step 5, and determining the initial production and the final production of each production layer in the small layers;
in step 2, determining parameters with strong correlation with yield in the first development layer according to the logging interpretation result, including: calculating the contribution coefficient of the first development layer sub-layer yield, wherein the thickness h, the permeability k, the original water saturation and the clay content of each sub-layer are respectively calculated;
the calculation formula of the fractional yield contribution coefficient is as follows:
fractional yield contribution coefficient f P K (1-water saturation) 1-argillaceous content, if there is correlation between other reservoir parameters and yield, self-introducing according to the positive and negative of the correlation;
in step 3, formula f is used ad Calculation of first development layer layered small-layer average yield correction coefficient f =combined yield/Σ (layered thickness×layered yield contribution coefficient) ad ；
In step 4, the formula q=h×f is used P *f ad The first development layer layered small layer primiparity Q can be calculated 1-1 、Q 1-2、 Q 1-3 … … and according to Q 1-1 、Q 1-2、 Q 1-3 … … is taken up of the first yield Q 1 Determining the first development layer split small layer end product;
in step 5, the second production layer is used for hole filling and initial production Q after combined production 2 Subtracting the final production of the first production layer to obtain the initial production of the second production layer, and if the second production layer is a plurality of small layers, executing the steps 2-5 to obtain the initial production and the final production of each small layer of the second production layer.
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