CN114881383A - Novel method for calculating layered recoverable reserves of commingled production well - Google Patents
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Abstract
The invention provides a new method for calculating layered recoverable reserves of a commingled production well, which comprises the following steps: step 1, determining single-well accumulated oil production, end production and reduction rate of a 1# layer according to development data of single-well daily oil production or monthly oil production; step 2, calculating the recoverable reserve of the layer 1; step 3, determining the 2# layer combined production oil, the end product and the decrement rate; step 4, calculating the recoverable reserve of the 2# layer; step 5, repeating the steps 3 and 4, and calculating the recoverable reserves of the rest layers; and 6, calculating the recoverable reserve of the last layer. The new method for calculating the layered recoverable reserves of the commingled production well has the application range covering all oil reservoir types and yield scales, ensures the closure of data and the rationality of an evaluation result, and provides a quick and effective technical means for evaluating the layered recoverable reserves.
Description
Technical Field
The invention relates to the technical field of petroleum recoverable reserves evaluation, in particular to a novel method for calculating layered recoverable reserves of a commingled production well.
Background
Recoverable reserves are the basis of sustainable development of oil fields and are the core of development efforts of oil companies. 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, the phenomena of hole filling and joint mining layer by layer are very common. Therefore, the development time of each small layer is overlapped, development data cannot be accurately split, finally, the recoverable reserves of each small layer are difficult to calculate, and great difficulty is caused to the analysis of the oil reservoir development condition and the potential displacement of the next enhanced recovery ratio.
In the application No.: in chinese patent application CN201410643123.7, a method for calculating the uncontrolled recoverable reserve of a water-drive reservoir is disclosed, and for a production-stop well, the method for calculating the uncontrolled recoverable reserve of a water-drive reservoir comprises: step 1, determining a selected object and collecting basic data of a production stopping well; step 2, analyzing the development condition before production halt; step 3, selecting a calculation model of the recoverable reserve of the single well of the water-drive oil reservoir according to the characteristics of the unit where the production stopping well is located; and step 4, calculating out-of-control recoverable reserves according to the calculation model.
In the application No.: CN201610832309.6, chinese patent application, relates to a method and a device for evaluating single well recoverable reserves, wherein the method comprises: calculating and obtaining the time period with the strongest correlation between the single-well yield of the production well and the final recoverable reserve of the single well of the production well according to the existing yield of each production well of the same oil-gas reservoir; obtaining a first relational expression according to the percentage of the single-well yield of each production well in the time period and the single-well yield of the production well; obtaining a second relational expression according to the percentage of the single-well final recoverable reserves of the production wells and the single-well final recoverable reserves; obtaining the yield of the new well in the time period, and obtaining the yield percentage of the new well corresponding to the yield of the new well according to the yield of the new well and the first relational expression; and obtaining the final recoverable reserve of the new well according to the yield percentage of the new well and the second relational expression.
In the application No.: CN201410048540.7 relates to a method for the layered development of a complex fault block thin oil reservoir, which comprises the following steps: determining the structure of an oil reservoir to be developed and the energy of the edge-bottom water oil reservoir; on the basis of determining the structure, fine geological stratification is realized, and development units are refined to a single sand body; on the basis of fine geological stratification, evaluating the reservoir property of each single sand body, and implementing the distribution condition and physical property characteristics of each single sand body spacing layer; on the basis of determining reservoir evaluation, determining the distribution rule of the residual oil of each single sand body and the size of the residual recoverable reserve through development effect analysis; after determining the distribution rule of the residual oil, obtaining a horizontal well deployment target layer and a vertical well exploitation reservoir layer recombination boundary by using numerical simulation and combining with the experience of a mine field; and on the basis of determining the conditions, implementing well pattern overall planning deployment and compiling a layered development scheme according to a layered development technology.
The prior art is greatly different from the method, and the technical problem which is required to be solved by the invention cannot be solved, so that a novel layered recoverable reserve calculation method for the commingled production well is invented.
Disclosure of Invention
The invention aims to provide a novel method for calculating the layered recoverable reserve of the commingled production well, which can provide reference for evaluating the layered recoverable reserve of a multilayer oil well in a mining field and provide a data base for improving the overall development level of an oil reservoir.
The object of the invention can be achieved by the following technical measures: the new method for calculating the layered recoverable reserves of the commingled production well comprises the following steps:
step 1, determining single-well accumulated oil production, end production and reduction rate of a 1# layer according to development data of single-well daily oil production or monthly oil production;
step 2, calculating the recoverable reserve of the layer 1;
step 3, determining the 2# layer combined production oil, the end product and the decrement rate;
step 4, calculating the recoverable reserve of the 2# layer;
step 5, repeating the steps 3 and 4, and calculating the recoverable reserves of the rest layers;
and 6, calculating the recoverable reserve of the last layer.
The object of the invention can also be achieved by the following technical measures:
the new method for calculating the layered recoverable reserves of the commingled production well further comprises the following assumed conditions are set when the recoverable reserves of each small layer are calculated:
1. according to the oil field development experience, the decline rate of a later development stage of a horizon is smaller than the decline rate of an earlier development stage;
2. after two times of mining, the movable technical reserves of one horizon are basically mined;
3. the decreasing rule of each small layer is not influenced by other small layers;
4. the descending mode of the high water content stage at the later development stage of each small layer is exponential descending.
In step 1, according to development data of daily oil production or monthly oil production of a single well, oil accumulation and final-stage production in the single production of a 1# production layer are determined, and the late-stage decline rate is fitted.
And 2, calculating the residual recoverable reserve by using the final-stage yield of the single production of the 1# layer and the late-stage decrement rate of the single production, and adding accumulated oil to obtain the recoverable reserve of the 1# layer.
In step 2, the formula for calculating the recoverable reserve of the layer 1 is as follows:
development layer 1:
in step 3, according to the lunar data of the layer 1 and the layer 2, the residual recoverable reserve of the layer 1 is subtracted from the recovered oil after the combined recovery to obtain the recovered oil of the layer 2; and simultaneously determining the final production of the commingled mining and fitting the late-stage reduction rate of the commingled mining.
In step 4, the remaining recoverable reserve can be calculated by using the final production of the 1# and 2# layer commingled production and the reduction rate at the later period of the commingled production, and the recoverable reserve of the 2# layer is obtained by adding the accumulated oil of the 2# layer.
In step 4, the formula for calculating the recoverable reserve of the 2# layer is as follows:
layer # 2:
in step 5, if the 3# and the 4# are adopted in the later period, the hole repairing and combining are carried out in sequence, and the step 3-4 is repeatedly executed.
In step 5, the formula for calculating the recoverable reserve of the nth layer is as follows:
n # layer:
and 6, in the last development position, subtracting the last product of the last development stage from the split yield of the position, namely the yield after commingled production, and dividing the final product by the reduction rate after commingled production to calculate the recoverable reserve.
In step 6, the formula for calculating the recoverable reserve of the last layer is as follows:
and finally, developing a horizon:
the new layered recoverable reserve calculation method for the commingled production well is based on the basic law of oil field development as an assumed condition, the most common daily production data and a simple calculation formula from the perspective of oil extraction engineering, and simplifies and solves the problems of oil accumulation splitting and recoverable reserve calculation in small layers. The calculation process does not involve complicated parameter recording and theoretical derivation, the application range can cover all oil reservoir types and yield scales, the closure of data and the reasonability of an evaluation result are ensured, and a quick and effective technical means is provided for the evaluation of the small-layer recoverable reserves.
Drawings
FIG. 1 is a flow chart of a new method for calculating the stratified recoverable reserves of a commingled producing well according to an embodiment of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
The prior method for calculating the recoverable reserves of the technology of the oil well in normal production mainly adopts a subtraction method. That is, based on the known initial production, the future production is predicted by using the fitted or analogical decrement rate, and the sum of the predicted production and the accumulated oil is the recoverable reserves of the oil well. For the combined oil production well, reasonable evaluation on the single-layer recoverable reserves can be realized as long as single-layer accumulated oil, the current yield and the future reduction rate can be reasonably split.
The invention aims to research a set of layered accumulated oil calculation method under the condition of known commingled production in each development time period, so as to realize the calculation of layered recoverable reserves.
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.
Referring to fig. 1, fig. 1 is a flow chart of an embodiment of the new method for calculating the stratified recoverable reserves of a commingled producing well according to the present invention. The invention mainly aims at the hole-repairing combined oil well layer by layer, and realizes the calculation of the layered recoverable reserves by the following technical measures:
And 103, calculating the residual recoverable reserve by using the final yield of the single production time of the 1# layer and the late decrement rate of the single production time, and adding the accumulated oil to obtain the recoverable reserve of the 1# layer.
Development layer 1:
105, subtracting the residual recoverable reserve of the layer 1 from the residual oil after commingling to obtain the oil accumulated in the layer 2 according to the lunar data of the layers 1 and 2; and simultaneously determining the final production of the commingled mining and fitting the late-stage reduction rate of the commingled mining.
And step 107, calculating the residual recoverable reserve by using the final production of the combined production of the 1# layer and the 2# layer and the reduction rate at the later stage of the combined production, and adding the accumulated oil of the 2# layer to obtain the recoverable reserve of the 2# layer.
Layer # 2:
and step 109, if the 3# and the 4# are adopted sequentially, the step 3-4 is executed repeatedly.
n # layer:
and step 111, in the final development position, dividing the split yield of the layer (the yield after the commingled mining is subtracted by the last yield of the last development stage) by the reduction rate after the commingled mining to calculate the recoverable reserve of the layer.
And finally, developing a horizon:
in an embodiment 1 to which the present invention is applied, when calculating the recoverable reserves of each small floor, the present invention sets three assumed conditions:
1. according to the oil field development experience, the decline rate of a later development stage of a horizon is smaller than the decline rate of an earlier development stage;
2. after two times of mining, the movable technical reserves of one horizon are basically mined;
3. the decreasing rule of each small layer is not influenced by other small layers;
4. the descending mode of the high water content stage at the later development stage of each small layer is exponential descending.
According to the assumed conditions, a calculation formula of the recoverable reserves of each small layer is established:
development layer 1:
an intermediate development layer:
and finally, developing a horizon:
in the specific embodiment 2 applying the invention, the No. 01 oil well has 3 oil-containing small layers in total, 1# layer is singly extracted in 5-6 months in 2002, and the oil is accumulated in the stage of 26 t; collecting small layer of 7-month hole-filling 2# in 2002 to 12-month in 2006, and performing stage oil 6629 t; and 3# small layer with additional holes is produced in 2007 in month 1 to month 2 in 2008, and oil is accumulated at stage 1666 t. High water content stopped in 2008 and 2 months. The production data for each sub-layer is shown in table 1.
Table 101 oil well each small layer production condition statistical table
The first step is as follows: and calculating the recoverable reserves of the layer 1.
26t of single accumulated oil of No. 1 layer, 0.7t/d of final product, 1.8 percent of later-period monthly decrement rate, 1167t (0.7 x 30/1.8 percent) of residual recoverable reserves, and 1193t in total.
The second step is that: and determining the accumulated oil of the 2# layer.
And subtracting the residual recoverable reserve 1167t of the layer 1 from the recovered oil 6629t of the layer 1# and the layer 2# to obtain the layer 2# recovered oil 5462 t.
The third step: and calculating the recoverable reserves of the 2# layer.
And (3.53 t/d) produced by the 1# and 2# layers in the combined mining end, 9.0 percent of later-period monthly decrement rate are used for calculating the residual recoverable reserve 1177t (3.53 x 30/9.0 percent), and the 2# layer accumulated oil 5462t is added to obtain the 2# layer recoverable reserve 6639 t.
The fourth step: and calculating the recoverable reserves of the layer 3.
And subtracting the 1# from the initial production 5.1t/d of the combined mining of the 1# layer to the initial production of the 3# layer, and subtracting the final production 3.53t/d of the combined mining of the 2# layer to obtain the initial production 1.57t/d of the 3# layer, and calculating the recoverable reserve 524t (3.53 x 30/9.0%) of the 3# layer according to the actual monthly decrement rate of 9.0% after the combined mining.
The calculation results are shown in Table 2.
TABLE 201 evaluation result table of recoverable reserves of each small layer of oil well
The sum of the recoverable reserves of the 1#, 2#, and 3# mining layers is 8356t, the high water cut-off is carried out after the oil accumulation 8321t of the No. 01 oil well in actual development, and the final yield is 0.2t/d before the cut-off; the recoverable reserves evaluation result of each small layer is matched with the layered initial production, and the total evaluation result is extremely close to the accumulated oil of the oil well before abandonment.
In the specific embodiment 3 applying the invention, 3 small oil-containing layers of the No. 03 oil well are totally produced, 1# layer is singly produced in 5-6 months in 2002, and the stage oil is accumulated by 26 t; collecting small layer of 7-month hole-filling 2# in 2002 to 12-month in 2006, and performing stage oil 6629 t; and 3# small layer with additional holes is produced in 2007 in month 1 to month 2 in 2008, and oil is accumulated at stage 1666 t. High water content stopped in 2008 and 2 months. The production data for each sub-layer is shown in table 1.
Table 101 oil well each small layer production condition statistical table
The first step is as follows: and calculating the recoverable reserves of the layer 1.
No. 1 layer only recovers oil 743t, does not produce 1.88t/d, and has a late monthly decrement rate of 1.8 percent and a residual recoverable reserve of 1128t (1.88 × 30/5 percent) for a total of 1871 t.
The second step is that: and determining the accumulated oil of the 2# layer.
And subtracting the residual recoverable oil content 1871t of the layer 1 from the recovered oil content 5301t of the layer 1# and the layer 2# to obtain the layer 2# recovered oil content 3430 t.
The third step: and calculating the recoverable reserves of the 2# layer.
And (3) calculating the residual recoverable reserve amount 1800t (0.9 x 30/1.5%) by using the final yield of the 1# and 2# layers in the combined mining, and the later-period monthly decrement rate of 1.5%, and adding 3430t of the 2# layer accumulated oil to obtain 5230t of the 2# layer recoverable reserve amount.
The fourth step: and calculating the recoverable reserves of the 3# layer.
And subtracting the initial yield of 1# and 2# layers from the initial yield of 6.3t/d of the combined mining of 1# and 3# layers by 0.9t/d of the final yield of the combined mining of 2# layers to obtain the initial yield of 5.4t/d of the 3# layers, and calculating the recoverable reserve of 7364t (5.4 x 30/2.2%) of the 3# layers according to the actual reduction rate of 2.2% after the 3# layers are mined.
The calculation results are shown in Table 2.
TABLE 201 evaluation result table of recoverable reserves of each small layer of oil well
The sum of the recoverable reserves of the 1#, 2#, and 3# mining layers obtained by the evaluation of the method is 14465t, the daily yield of the No. 02 oil well is 1.5t/d after the oil is accumulated in 12574t in actual development, and the recoverable reserve of the residual technology is 1891 t; the matching of the residual recoverable reserves and the later-period yield is better, and the overall calculation result is more reasonable.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
Claims (12)
1. The novel method for calculating the layered recoverable reserves of the commingled production well is characterized by comprising the following steps of:
step 1, determining single-well accumulated oil production, end production and reduction rate of a 1# layer according to development data of single-well daily oil production or monthly oil production;
step 2, calculating the recoverable reserve of the layer 1;
step 3, determining the 2# layer combined production oil, the end product and the decrement rate;
step 4, calculating the recoverable reserve of the 2# layer;
step 5, repeating the steps 3 and 4, and calculating the recoverable reserves of the rest layers;
and 6, calculating the recoverable reserve of the last layer.
2. The new method for calculating the layered recoverable reserve of the commingled production well according to claim 1, further comprising the following assumed conditions when calculating the recoverable reserve of each small layer:
1. according to the oil field development experience, the decline rate of a later development stage of a horizon is smaller than the decline rate of an earlier development stage;
2. after two times of mining, the movable technical reserves of one horizon are basically mined;
3. the decreasing rule of each small layer is not influenced by other small layers;
4. the descending mode of the high water content stage at the later development stage of each small layer is exponential descending.
3. The new method for calculating the layered recoverable reserve of the commingled producing well according to the claim 1, characterized in that in the step 1, the oil accumulation and the terminal production of the 1# production layer during the single production are determined according to the development data of the daily oil production or monthly oil production of the single well, and the later-stage decline rate is fitted.
4. The new method for calculating the layered recoverable reserve of the commingled production well according to the claim 1, characterized in that in the step 2, the residual recoverable reserve is calculated by using the final yield of the single production time of the 1# layer and the late decrement rate of the single production time, and the 1# layer recoverable reserve is obtained by adding the accumulated oil.
5. The new method for calculating the layered recoverable reserve of the commingled production well according to claim 4, wherein the formula for calculating the recoverable reserve of the 1# layer in the step 2 is as follows:
development layer 1:
6. the new method for calculating the layered recoverable reserve of the commingled production well according to the claim 1, characterized in that in the step 3, according to the monthly data of the 1# layer and the 2# layer, the residual recoverable reserve of the 1# layer is subtracted from the accumulated oil after the commingled production to obtain the accumulated oil of the 2# layer; and simultaneously determining the final production of the commingled mining and fitting the late-stage reduction rate of the commingled mining.
7. The new method for calculating the layered recoverable reserve of the commingled production well according to the claim 1, characterized in that in the step 4, the residual recoverable reserve can be calculated by using the rate of decrease of the final production of the 1# layer and the 2# layer commingled production and the later period of the commingled production, and the 2# layer accumulated oil is the 2# layer recoverable reserve.
8. The new method for calculating the layered recoverable reserve of the commingled production well according to claim 7, wherein the formula for calculating the recoverable reserve of the 2# layer in the step 4 is as follows:
layer # 2:
9. the new method for calculating the layered recoverable reserve of the commingled production well according to claim 1, wherein in step 5, if the 3#, 4#. the.
10. The new method for calculating the layered recoverable reserve of the commingled production well according to claim 9, wherein in step 5, the formula for calculating the recoverable reserve of the nth layer is as follows:
n # layer:
11. the new method for calculating the layered recoverable reserve of the commingled production well according to claim 1, wherein in step 6, at the final development horizon, the recoverable reserve can be calculated by subtracting the last production of the last development stage from the split production of the layer, i.e. the yield after commingled production, and dividing by the rate of decrease after commingled production.
12. The new method for calculating the layered recoverable reserve of the commingled production well according to claim 11, wherein in step 6, the formula for calculating the recoverable reserve of the last layer is as follows:
and finally, developing a horizon:
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| CN117287150B (en) * | 2023-08-31 | 2024-04-19 | 中国地质大学（北京） | Method, device, terminal and storage medium for acquiring economic recoverable resource amount of coalbed methane |
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