CN111382523A - New method for splitting oil well yield - Google Patents

New method for splitting oil well yield Download PDF

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CN111382523A
CN111382523A CN202010189294.2A CN202010189294A CN111382523A CN 111382523 A CN111382523 A CN 111382523A CN 202010189294 A CN202010189294 A CN 202010189294A CN 111382523 A CN111382523 A CN 111382523A
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layer
yield
production
small
initial
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CN111382523B (en
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张付兴
徐永梅
颜子
邓国亮
胡宝明
聂振霞
张孝天
王滨
刘新秀
梁保红
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China Petroleum and Chemical Corp
Exploration and Development Research Institute of Sinopec Shengli Oilfield Co
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China Petroleum and Chemical Corp
Exploration and Development Research Institute of Sinopec Shengli Oilfield Co
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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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • 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
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/02—Agriculture; Fishing; Mining
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping

Abstract

The invention provides a new method for splitting the yield of a commingled production well, which comprises the following steps: step 1, determining the commingled production Q of the first development layer1(ii) a Step 2, calculating a contribution coefficient of the first development layer layered small-layer yield; step 3, calculating an average yield correction coefficient of the first development layer sub-layer; step 4, calculating the initial yield and the final yield of the first development layer of the small layers; step 5, determining the initial yield and the final yield of the second development layer; and 6, repeating the step 5, and determining the initial yield and the final yield of each layer divided into small layers. The new method for splitting the yield of the commingled production well greatly improves the efficiency of splitting the commingled production well into small layers and initially producing, ensures the closure of data and provides a quick and effective technical support means for evaluating the recoverable reserves of the small layers. Meanwhile, the method also considers two development modes of the combined production well, and can be widely applied to various wellsAnd (4) evaluating the recoverable reserves of the similar commingled production wells.

Description

New method for splitting oil well yield
Technical Field
The invention relates to the field of petroleum recoverable reserve evaluation, in particular to a new method for splitting the yield of a commingled production well.
Background
The reservoir of petroleum explored in China is mainly deposited on the continental facies, most of the reservoirs are deposited in a multilayer way, and the characteristics of multiple oil-bearing layers and thin single-layer thickness are obvious. In the process of oil and gas reserve development, in order to reach the lowest economic limit initial production, the phenomena of multi-layer and small-layer combined production or later-stage layer-by-layer hole patching and combined production of an oil well are very common, so that development data of the separated layers are difficult to accurately split, and great difficulty is caused in calculating the recoverable reserve of the separated layers. The current domestic commonly used yield splitting method splits the yield of each small layer according to the proportion of kh (the product of permeability and thickness), but practical development data show that: the yield of the small layers is influenced by the physical properties of the oil reservoir and the properties of the fluid in various ways, and the difference between the simple splitting mode and the actual development effect is larger.
According to a single well productivity calculation formula: q. q.so＝Jo·Δps；JoIs the oil recovery index; Δ psTo produce a pressure differential.
It can be known that when the well section of the combined production layer is close, the production pressure difference is basically consistent, and the initial production can be split according to the proportion of the oil extraction index. The method for determining the oil recovery index mainly comprises the following steps: a test oil and production test method, a stable well test method, a theoretical formula method, a similar method and the like.
The theoretical calculation formula of the oil extraction index is as follows:
Figure BDA0002414519390000011
k-absolute permeability of the oil layer, 10-3μm2；
kro-relative permeability of oil, decimal;
ho-effective thickness of the oil layer, m;
Bo-formation crude oil volume factor, decimal;
re-oil supply radius, m;
rw-borehole radius, m;
μo-formation crude oil viscosity, mpa.s;
s-epidermal coefficient, decimal.
The method considers the influence of the physical property and the fluid property of the oil layer, so the method is suitable for oil wells of oil reservoirs with different exploitation modes, is widely applied, and needs trial production and production data correction.
From the theoretical calculation formula, it can be known that: in the physical properties (mu) of crude oilo，Bo) The ratio of the initial production of the layering is positively correlated with the permeability, thickness and relative permeability (oil content) of the oil when the well completion conditions (borehole radius, skin coefficient and the like) and the production pressure difference are close. The regression relationship between the initial production of a unit single production well and a plurality of oil reservoir parameters can also be seen as follows: the initial production is positively correlated with the thickness and permeability of the oil layer, and is negatively correlated with the initial water saturation and the shale content (see fig. 2, 3, 4 and 5), but each single factor is not a main factor, and the correlation is poor.
In the application No.: 201910972695.2, relates to a method and a system for splitting the yield of a multi-layer commingled producing gas well, the method comprises: establishing a comprehensive relation between the annual layered yield contribution rate of the gas formation components and the well logging interpretation parameters according to the annual output profile test data and the well logging interpretation parameters of the gas formation components of the single well; according to section test data produced by the gas layer component years of the single well, calculating the historical average yield contribution rate of the gas layer component years in layering; according to the gas layer component annual stratification historical average yield contribution rate and the comprehensive relationship between the gas layer component annual stratification yield contribution rate and the logging interpretation parameters, fitting and determining the weight coefficient of each logging interpretation parameter in the comprehensive relationship by adopting a multiple linear regression algorithm, and further determining the final comprehensive relationship between the gas layer component annual stratification yield contribution rate and the logging interpretation parameters; reversely deducing and determining a calculation relational expression of the annual and hierarchical yield contribution rate of the gas formation component according to the final comprehensive relation of the annual and hierarchical yield contribution rate of the gas formation component and the well logging interpretation parameters; and calculating a relational expression according to the annual section testing data of the gas layer components of the single well and the annual and hierarchical yield contribution rate of the gas layer components determined by reverse deduction, and splitting the yield of the single well. It is not practical for a synthetic production well to conduct a stratification test during commingling in order to determine the production of each sub-zone. Firstly, the yield is influenced, secondly, the distance between small layers is mostly small, and the layered test cannot be technically realized. The above method is not applicable to oil wells.
In the application No.: 201811526908.0, relates to a dynamic and static coupling-based oil well layered yield splitting method, which comprises the following steps: s100, determining a static splitting coefficient; the single well perforation data is returned according to the layering result, and a static splitting coefficient is generated according to the single well logging interpretation result and the perforation thickness; s200, determining a splitting coefficient of a single well section; after grading according to the liquid production profile data in layers, generating a profile splitting number; and S300, determining a dynamic splitting coefficient according to the static splitting coefficient and the section splitting coefficient. The method is still complex in principle and calculation process, and parameters related to yield such as layered water saturation and argillaceous content are not considered in the calculation process. There is also no explicit explanation on the overall closeness of the split results to the actual data.
Therefore, a new method for splitting the yield of the commingled production well is invented, and the technical problems are solved.
Disclosure of Invention
The invention aims to provide a new yield splitting method for a commingled production well, which can lay a foundation for evaluating the recoverable reserves of the commingled production well in a mine site in small layers and provide a support for excavating the potential of residual oil in small layers.
The object of the invention can be achieved by the following technical measures: the new method for splitting the output of the commingled production well comprises the following steps: step 1, determining the commingled production Q of the first development layer1(ii) a Step 2, calculating a yield contribution coefficient f of the first development layer layeringP(ii) a Step 3, calculating the average yield correction coefficient f of the first development layer small layerad(ii) a Step 4, calculating the initial yield and the final yield of the first development layer of the small layers; step 5, determining the initial production and the final production of the second production layer in small layers; and 6, repeating the step 5, and determining the initial yield and the final yield of each layer divided into small layers.
The object of the invention can also be achieved by the following technical measures:
in step 2, according to the well logging interpretation result, parameters such as thickness h, permeability k, original water saturation, shale content and the like of each small layer in the first development layer are determined, and the contribution coefficient of the small layer yield of the first development layer is calculated.
In step 2, the formula for calculating the yield contribution coefficient of the sub-layer is as follows:
yield contribution factor fPK (1-water saturation) (1-shale content), if there are other reservoir parameters that have a correlation with production, it can be introduced by itself depending on whether the correlation is positive or negative.
In step 3, using the formula fadCalculating the average yield correction coefficient f of the first development layer and the small layer (the layer thickness ＊ layer yield contribution coefficient) of the first development layer as the combined mining initial yield/∑ad。
In step 4, the formula q ═ h × f is usedP*fadNamely, the first development layer layered small layer initial yield Q can be calculated1-1、Q1-2、Q1-3… …, and according to Q1-1、Q1-2、Q1-3… … occupying initial production Q of commingled mining1Ratio of (A to (B)Example the first development level is determined to be the end of the small layer.
In step 5, the second production zone is used for hole patching and combined production, and then the initial production Q is produced2And (3) subtracting the final product of the residual mining small layer of the first production layer to obtain the initial product of the second production layer, and if the second production layer is a plurality of small layers, executing the step 2-5 to obtain the initial product and the final product of each small layer of the second production layer.
The new method for splitting the output of the commingled production well has reference significance for reasonably splitting the output of the commingled production well into small layers, and reasonable evaluation of the single-layer recoverable reserve can be realized by fitting the well or comparing the reduction rate of the same layer of other oil wells as long as the single-layer initial output can be reasonably split for the commingled production well. The method is based on a theoretical formula, is assisted by actual development experience, solves the problems of more relevant parameters, difficult value taking, complex calculation, correction of results and the like of the theoretical formula in the preliminary production split by using a simplified processing mode of a yield contribution coefficient and a yield coefficient, greatly improves the efficiency of the preliminary production split of small layers of the commingled production well, ensures the closure of data, and provides a quick and effective technical support means for the evaluation of the recoverable reserves of the small layers. Meanwhile, the method also considers two development modes of the combined production well, and can be widely applied to the recoverable reserves evaluation of various combined production wells.
Drawings
FIG. 1 is a flow chart of the new method for splitting the production rate of the commingled production well according to the present invention;
FIG. 2 is a graph of initial production versus reservoir thickness for a unit well in accordance with an embodiment of the present invention;
FIG. 3 is a graph of initial production versus permeability for a unit of oil well in accordance with an embodiment of the present invention;
FIG. 4 is a graph of initial production versus water saturation for a unit well in accordance with an embodiment of the present invention;
FIG. 5 is a graph of initial production and shale content for a unit of oil well in accordance with an embodiment of the present invention.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
The invention establishes the concepts of 'yield contribution coefficient index' and 'yield correction coefficient' on the basis of summarizing a theoretical calculation formula and researching the relation between the actual initial yield of a typical unit and each parameter, and is used for splitting the initial yield.
Yield contribution factor fPK (1-water saturation) (1-shale content); other reservoir parameters may be added if they correlate with yield.
Yield correction factor fadInitial yield q/oil layer thickness h/yield contribution coefficient fP。
The relationship between the initial production and each parameter can be expressed as: q ═ h ═ fP*fad。
Commingled production wells generally have two conditions: one is a cage-unified production well, namely a plurality of small layers are simultaneously jetted to carry out combined production at the initial production stage; the second is a hole-patching combined production well, that is, after a certain small layer is produced for a period of time, the yield is reduced, and combined production is carried out on other layers by means of patching for improving the productivity of a single well. The first case can be considered as the initial stage of the second case, and the yield splitting method is the same as the way in which the commingled mining stage is processed in the second case.
FIG. 1 is a flow chart of the new method for splitting the production capacity of the commingled production well of the present invention. The object of the invention can be achieved by the following technical measures:
step 101, determining the initial production Q of the 1# development layer commingled mining1(typically monthly oil production).
103, determining the thickness h, the permeability k, the original water saturation and the shale content of each small layer in the 1# development layer according to the well logging interpretation result; using the formula fPAnd (4) calculating the contribution coefficient of the sub-layer yield (referring to the logging interpretation parameters of other oil wells and the sub-layer in the block if the physical parameters of the well are lacked).
Step 105, using the formula fadThe 1# development level average yield correction factor was calculated as commingled production initial/∑ (layered thickness ＊ layered yield contribution factor).
Step 107, using the formula q ═ h × (f)P*fadCan calculate to obtain 1#Development level layering small layer first production Q1-1、 Q1-2、Q1-3… …, and according to Q1-1、Q1-2、Q1-3… … occupying initial production Q of commingled mining1The ratio of (1) determines the end product of the development level hierarchy level.
Step 109, performing hole-filling joint mining on the 2# layer to obtain a first-produced Q2Subtracting the residual exploitation small layer (part of small layers may be blocked by high water content) of the 1# layer to obtain the initial production of the 2# production layer, and if the 2# layer is a plurality of small layers, performing step 103 and step 107 to obtain the initial production and the final production of each small layer of the 2# production layer.
And step 111, if the 3# and 4# … … layers are sequentially subjected to hole filling and combination in the later period, repeating the step 109.
The following is a specific embodiment applying 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 jointly produced in 1 month to 9 months in 2009; in 2009, after the number 6 small layer of the hole is supplemented in 9 months, the combined production is carried out. The parameters of each small layer are shown in table 1.
Table 101 oil well each small layer parameter and production condition statistical table
Figure BDA0002414519390000051
The first step is as follows: using the formula fPCalculating the contribution coefficient of the 1# mining stratum fraction small layer yield (1-water saturation) (1-shale content);
the second step is that: using the formula fadCalculating the average yield correction coefficient of the 1# mining layer/small layer (the thickness of the small layer) according to the combined mining initial yield/∑ (the contribution coefficient of the small layer yield);
the third step: using the formula q ═ h ═ fP*fadThe number 1# mining layer 1, the number 2 and the number 3 small layer initial production can be split, and the small layers account for the proportion of the combined mining initial production to split and the final production.
The fourth step: and subtracting the final product of the layer 1 from the initial product after the layer 2 is jointly mined to obtain the initial product of the layer 2, namely 12.6 t/d.
The yield split results are shown in table 2.
Table 201 oil well each small layer output splitting table
Figure BDA0002414519390000061
The method can more simply, conveniently and accurately split each small layer of yield under the condition of ensuring data closure, and is used for next step of recoverable reserves evaluation.

Claims (6)

1. The new method for splitting the yield of the commingled production well is characterized by comprising the following steps of:
step 1, determining the commingled production Q of the first development layer1；
Step 2, calculating a yield contribution coefficient f of the first development layer layeringP；
Step 3, calculating the average yield correction coefficient f of the first development layer small layerad；
Step 4, calculating the initial yield and the final yield of the first development layer of the small layers;
step 5, determining the initial product and the final product of the second production layer in small layers;
and 6, repeating the step 5, and determining the initial yield and the final yield of each layer divided into small layers.
2. The new method for splitting the yield of the commingled production well according to claim 1, wherein in step 2, parameters with strong correlation with the yield, such as the thickness h, the permeability k, the original water saturation and the shale content 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 small layer yield of the development layer of the first development layer is calculated.
3. The new method for splitting the production capacity of the commingled production well according to claim 2, wherein in the step 2, the calculation formula of the contribution coefficient of the production in the small layer is as follows:
yield contribution factor fPAnd if other reservoir parameters have the correlation with the yield, the reservoir parameters are automatically introduced according to the positive and negative of the correlation.
4. The new method for splitting the yield of commingled producing well according to claim 1,characterized in that in step 3, the formula f is usedadCalculating the average yield correction coefficient f of the first development layer with small layer as the combined mining initial yield/∑ (layer thickness and layer yield contribution coefficient)ad。
5. The method of claim 1 wherein in step 4, the formula q h fP*fadNamely, the first development layer layered small layer initial yield Q can be calculated1-1、Q1-2、Q1-3… …, and according to Q1-1、Q1-2、Q1-3… … occupying initial production Q of commingled mining1The ratio of (a) determines the end product of the first development level sub-level.
6. The method of claim 1 wherein in step 5, the second production zone is used to patch the initial production Q after co-production2And (3) subtracting the final product of the residual mining small layer of the first production layer to obtain the initial product of the second production layer, and if the second production layer is a plurality of small layers, executing the step 2-5 to obtain the initial product and the final product of each small layer of the second production layer.
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