CN113586041A - Method for generating steam distribution plan of heavy oil well - Google Patents
Method for generating steam distribution plan of heavy oil well Download PDFInfo
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- 238000009826 distribution Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 59
- 239000000295 fuel oil Substances 0.000 title claims abstract description 37
- 238000010793 Steam injection (oil industry) Methods 0.000 claims abstract description 94
- 230000005465 channeling Effects 0.000 claims abstract description 87
- 238000012163 sequencing technique Methods 0.000 claims abstract description 21
- 238000012216 screening Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims description 38
- 239000003921 oil Substances 0.000 claims description 27
- 239000010779 crude oil Substances 0.000 claims description 14
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
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- 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
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- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
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Abstract
The invention provides a method for generating a steam distribution plan of a heavy oil well. The steam distribution plan generation method comprises the following steps: step S10: screening out a plurality of to-be-rotated wells of a target well area, which need to be subjected to steam injection; step S20: sequencing a plurality of wells to be turned; step S30: detecting each well to be rotated; step S40: judging whether each well to be turned has a steam channeling phenomenon, if so, executing a step S41 of selecting the well to be turned with the steam channeling phenomenon; if not, the step S42 of reserving the sequencing situation of the wells to be steered is executed, and the step S43 of grouping all the wells to be steered without the steam channeling phenomenon is executed to obtain the main well group to be steered. The technical scheme of the invention solves the problems of time and labor waste caused by the fact that manual well-by-well analysis and discussion are needed to generate a steam distribution plan in the prior art, can realize optimized steam injection and meet the fine management requirement of a heavy oil field.
Description
Technical Field
The invention relates to the technical field of steam distribution of a heavy oil well, in particular to a method for generating a steam distribution plan of the heavy oil well.
Background
The conventional steam distribution management mode of the thickened oil well needs manual well-by-well analysis discussion and plan arrangement, wastes time and labor, does not realize optimization of steam injection amount, and cannot meet the fine management requirement of the thickened oil field.
Disclosure of Invention
The invention mainly aims to provide a method for generating a steam distribution plan of a heavy oil well, which aims to solve the problems that the generation of the steam distribution plan needs to be discussed by adopting manual well-by-well analysis in the prior art, the time and the labor are wasted, the steam injection can be optimized, and the fine management requirement of the heavy oil field is met.
In order to achieve the above object, the present invention provides a method for generating a steam distribution plan for a heavy oil well, the method comprising: step S10: screening out a plurality of to-be-rotated wells of a target well area, which need to be subjected to steam injection; step S20: sequencing a plurality of wells to be turned; step S30: detecting each well to be rotated; step S40: judging whether each well to be turned has a steam channeling phenomenon, if so, executing a step S41 of selecting the well to be turned with the steam channeling phenomenon; if not, the step S42 of reserving the sequencing situation of the wells to be steered is executed, and the step S43 of grouping all the wells to be steered without the steam channeling phenomenon is executed to obtain the main well group to be steered.
Further, after step S41, the generating method further includes step S44 of determining whether values of parameters in the first parameter set of each well to be steered, in which a steam channeling phenomenon occurs, are within a preset range; if yes, performing a step S45 of counting the number of all wells to be turned with steam channeling; if not, a step S46 of abandoning the wheel well to be diverted in which the steam channeling phenomenon occurs is performed.
Further, before step S10, the generating method further includes step S05 of estimating the number of wells to be turned in the target well region and obtaining the estimated number of wells to be turned; after step S45, the generating method further includes a determining step S50 of determining whether the number of all wells to be turned, in which the steam channeling occurs, is greater than or equal to the estimated number; if yes, a sequencing step S51 of sequencing all the wells to be steered with the steam channeling phenomenon is executed; if not, step S52 of abandoning all the wells to be diverted where steam channeling occurs is performed.
Further, the sorting step S51 includes a step S53 of averaging the values of all the parameters in the second parameter set of each steam channeling-occurring well to be turned, and a step S54 of sorting all the steam channeling-occurring wells to be turned in the order of the average differences from small to large.
Further, after the sorting step S51, the generating method further includes a step S55: selecting the wheel wells to be rotated, wherein the occurrence frequency of the steam channeling phenomenon is more than or equal to N, and N is an integer more than or equal to 1, from all the wheel wells to be rotated, wherein the steam channeling phenomenon occurs.
Further, the generating method further includes a step S56 of grouping all wells to be steered whose occurrence frequency of the steam channeling is greater than or equal to N to obtain an alternative well group to be steered.
Further, the generation method also comprises the step of grouping the wells to be turned according to the steam injection distance and the furnace line relation.
Further, after the step S56, the generating method further includes a step S60: and generating a turning plan of each to-be-turned well of the alternative to-be-turned well group according to the static oil deposit data and the dynamic production data of the target well zone.
Further, after the step S43, the generating method further includes a step S65: and generating a rotating wheel plan of each to-be-rotated wheel well of the main to-be-rotated wheel well group according to the static oil deposit data and the dynamic production data of the target well zone.
Further, the generation method further comprises: step S70: generating a steam distribution plan according to the rotating wheel plan of each to-be-rotated wheel well and by combining the steam distribution dynamic indexes of each to-be-rotated wheel well; step S75: and adjusting the steam distribution plan.
Further, the first set of parameters includes one or more of a block in which each well is located, a furnace line relationship, a well type, a production day, a liquid production amount, an average liquid production amount, and a water cut amount.
Further, the second set of parameters includes one or more of well classification, steam channeling information, well spacing, effective thickness, perforation thickness, crude oil viscosity, permeability, porosity, and oil saturation.
By applying the technical scheme of the invention, a plurality of wells in the target well area can be simultaneously screened, sequenced and grouped, so that a main to-be-turned wheel well group is obtained, a foundation is laid for subsequently generating a steam distribution plan, manual well-by-well analysis discussion and plan arrangement are not needed, and time and labor are saved; through the analysis of the multi-well system in the target well area, the optimized steam injection of each heavy oil well in the target well area can be realized, and the fine management requirement of the heavy oil field is met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a flow chart of an embodiment of the method for generating a steam distribution plan for a heavy oil well according to the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, 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 application belongs.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
In the related technology, the steam distribution plan of the conventional well of the heavy oil needs to be analyzed, discussed and arranged manually well by well, which wastes time and labor, the steam injection amount is not optimized, and the fine management requirement of the heavy oil field cannot be met.
The application also provides a control system which comprises an acquisition module, an analysis module and a controller. The acquisition module is used for acquiring data of each parameter in the first parameter set, the second parameter set and the third parameter set and data of static oil deposit data, dynamic production data and the like, and the analysis module is used for analyzing the data acquired by the acquisition module. Preferably, the data obtained by the acquisition module may be data from a database of target well zones or daily data of heavy wells of the target well zones or other data sources enabling the acquisition module to obtain data.
It should be noted that, in the embodiment of the present invention, the method for generating the steam distribution plan of the heavy oil well in the technical scheme of the present invention is applied to a certain heavy oil huff and puff development area, and the wells to be turned in the whole area are screened and grouped to generate the steam distribution plan.
The embodiment of the invention relates to big data analysis and application, and the big data analysis and application is combined with automatic data of a heavy oil huff and puff well, well pattern coordinates and steam injection boiler control, so that a steam distribution management mode of a conventional heavy oil well is optimized.
As shown in fig. 1, in an embodiment of the present invention, a method for generating a steam distribution plan of a heavy oil well includes:
step S10: screening out a plurality of to-be-rotated wells of a target well area, which need to be subjected to steam injection;
step S20: sequencing the multiple wells to be turned;
step S30: detecting each well to be rotated;
step S40: judging whether each well to be turned has a steam channeling phenomenon, if so, executing a step S41 of selecting the well to be turned with the steam channeling phenomenon; if not, the step S42 of reserving the sequencing situation of the wells to be steered is executed, and the step S43 of grouping all the wells to be steered without the steam channeling phenomenon is executed to obtain the main well group to be steered.
By the technical scheme, multiple wells in the target well area can be simultaneously screened, sorted and grouped, so that a main to-be-turned wheel well group is obtained, a foundation is laid for subsequently generating a steam distribution plan, manual well-by-well analysis discussion and plan arrangement are not needed, and time and labor are saved; through the analysis of the multi-well system in the target well area, the optimized steam injection of each heavy oil well in the target well area can be realized, and the fine management requirement of the heavy oil field is met. According to the technical scheme, the on-site acquisition module is used for automatically acquiring data, and optimized screening, sequencing and grouping are performed on each heavy oil well in the target well area, the whole process can be performed in a computer, manual well-by-well analysis and discussion are not needed, and time, labor and time are saved, and the method is rapid and convenient; on the other hand, through the steps, a foundation can be laid for the subsequent generation of a steam distribution plan, the optimized steam injection of each heavy oil well in the target well area is realized, and the fine management requirement of the heavy oil field is met.
It should be noted that, in the above technical solution, in the process of executing step S42 and step S43, step S42 and step S43 do not have a sequential order of execution, and step S42 or step S43 may be executed first according to actual needs, that is, step S42 may be executed first, and then step S43 (as shown in fig. 1) is executed first, and of course, step S43 may be executed first, and then step S42 is executed.
Specifically, in step S10, the low-producing well of the target well region is preferentially screened. The low-yield well is a well with low yield caused by insufficient stratum energy due to overlong production time, and does not comprise a low-yield well caused by other reasons, wherein the other reasons comprise that the pressure is not suppressed, a pipeline is broken, an oil collecting line is broken, a casing head is leaked, a cavel valve is leaked, and the well is discharged from the inside and the outside, and is closed by steam channeling.
Of course, in an alternative embodiment of the present invention, which is not shown in the drawings, the multiple wells to be turned, where the target well zone needs to be steam injected, may further include shut-in wells, which are shut-in wells to be injected due to low production inefficiency.
Alternatively, shut-in wells and low-producing wells may be simultaneously taken as wells to be turned for steam injection.
Preferably, in step S10, each low-yield well of the target well zone may be screened according to each parameter in the first parameter set to obtain a plurality of wells to be turned, where the target well zone needs to inject steam; the first parameter set comprises one or more of the block where each well is located, the furnace line relationship, the well type, the production days, the liquid production amount, the average liquid production amount, the water content and the like.
Optionally, in the embodiment of the present invention, based on the historical data of the last 10 days of each lowry well of the target well zone, each lowry well of the target well zone is screened according to the following conditions:
1. when the well type is a vertical well, a to-be-rotated well which needs to be injected with steam can be screened out according to one or more conditions of the liquid production amount being less than 3t, the temperature of the liquid production liquid being less than 50 ℃, the water content being more than 80 percent and the production days being more than 90 days;
2. when the well type is a horizontal well, the wheel well to be rotated which needs to be injected with steam can be screened out according to one or more conditions of the liquid extraction amount being less than 5t, the liquid extraction liquid temperature being less than 50 ℃, the water content being more than 80 percent and the production days being more than 90 days.
Preferably, a plurality of wells to be turned, which need to be subjected to steam injection, of the screened target well zone are located at the same layer.
Preferably, in step S20, the screened multiple wells to be turned may be scored according to the weight corresponding to each parameter in the second parameter set, and the multiple wells to be turned may be sorted according to the scoring result; wherein the second set of parameters includes one or more of well classification, steam channeling information, well spacing, effective thickness, perforation thickness, crude oil viscosity, permeability, porosity, and oil saturation, among others.
It should be noted that the scoring step is set for the purpose of convenience and optimizing the sequence of the multiple wells to be rotated; optionally, the multiple to-be-turned wells may be sorted by setting an upper limit coefficient for each parameter in the second parameter set, for example, if the upper limit coefficient for the oil saturation is set to n, the more the to-be-turned wells that are less than n and closer to n need steam injection, that is, the more the ranking of the to-be-turned wells in the sorting result is; optionally, the value of n for each parameter may be determined empirically and/or based on historical data for each parameter; or scoring according to the steam injection distance, wherein the shorter the steam injection distance (namely, the closer the distance from the wheel well to be rotated to the steam injection boiler or the steam injection station is), the higher the score is; or, according to the classification condition of the oil well, determining the classification of the well, wherein the smaller the classification value of the well, the higher the score (for example, the score of the first-class well is higher than that of the second-class well, and the score of the second-class well is higher than that of the third-class well); and scoring according to the evaluation conditions, wherein the well with high score is arranged in front of the well with low score is arranged behind the well with low score, so that the sequencing of a plurality of wells to be turned is realized. Or the parameters such as steam injection distance, well category and the like are comprehensively considered, and the multiple wells to be turned are scored and sequenced. Of course, the optimization of the sequence of the multiple rotary wells to be rotated can be realized in other forms according to the actual situation and the actual needs.
Preferably, in step S43, according to the sequence of the wells to be wheeled in step S42, all wells to be wheeled that do not generate steam channeling are grouped in combination with each parameter in the third parameter set of the wells to be wheeled to obtain a main well to be wheeled; the third parameter set comprises one or more of the block where each to-be-turned well is located, the furnace line relationship, the located layer, the well type, the category and the like.
The categories include first-type wells, second-type wells, third-type wells, and the like, and the categories are manually classified by a person skilled in the geological field. Optionally, the oil wells in the target well zone can be classified according to one or more indexes of oil-gas ratio, production degree, oil layer thickness and the like by combining information such as well type (such as a vertical well or a horizontal well) and daily oil production (t/d) (see table 1); for example, when the oil-gas ratio is more than or equal to 0.08, the well type is a vertical well, the daily oil yield is more than or equal to 1.7t/d, the well type is a first-class well, and when the oil-gas ratio is more than or equal to 0.05 and less than 0.08, the well type is a vertical well, and the daily oil yield is more than or equal to 0.9t/d and less than 1.7t/d, the well type is a second-class well. Of course, the skilled person in heavy oil recovery can judge the type of well according to his own experience or the parameter values of certain parameters, and will not be described in detail here.
TABLE 1 statistical table of oil well classification indexes in conventional thickened oil zone
From the experience of the skilled person, it is known that different classifications of wells may be used with different measures, such as, for example, one type of well: the production effect of the high-yield well needs to be stabilized by improving the steam injection strength; two types of wells: the drainage period of the oil well is prolonged, and the descending of the oil well is reduced; three types of wells: slowing down the rhythm of the runner and reducing the ineffective steam injection.
Optionally, the generating method further comprises the step of grouping the multiple wells to be turned according to the steam injection distance, the furnace line relation and the like; if the steam injection distance is set to be m, a circle is formed by taking the steam injection boiler as the center and taking the m as the radius, all the to-be-rotated wheel wells in the circle range can be divided into a group, and all the to-be-rotated wheel wells in the group of to-be-rotated wheel wells can be subjected to steam injection by the steam injection boiler. In step S43, all the wells to be steered which do not generate steam channeling are grouped by the above-mentioned grouping step to obtain a main well group to be steered; and each to-be-rotated well in each to-be-rotated well group after being grouped corresponds to one steam injection boiler, and the steam injection boilers are used for injecting steam for each to-be-rotated well in the to-be-rotated well group. Optionally, in the case of injecting steam by the same steam injection boiler, the wells to be turned may be further grouped according to the located layer and the well type, so that the wells to be turned, which are injected with steam by the same steam injection boiler, located at the same layer and have the same well type, may be grouped into one group.
In the following, for example, under the conditions of the wells of the same steam injection station: selected wells were scored according to the following conditions:
(1) the distance from the rotary shaft to the steam injection station is closer, and the score is higher;
(2) preferably selecting the type 1 well and the type 2 well according to the oil well classification table data; the smaller the well category value, the higher the score, e.g., a category 1 well is higher than a category 2 well score;
(3) traversing (circularly) all the wells to be rotated, selecting the wells with the same well type under the same layer as a group, scoring according to the evaluation conditions of 1) and 2), finding out the group with the highest score in all the groups as the well group to be optimally screened, taking the corresponding layer and well type of the group as the target screening layer and well type, then sorting, sorting according to the preferred conditions of 1) and 2), and ranking the wells with the highest score to the front.
As shown in fig. 1, in the embodiment of the present invention, after the step S43, the generating method further includes a step S65: and generating a rotating wheel plan of each to-be-rotated wheel well of the main to-be-rotated wheel well group according to the static oil deposit data and the dynamic production data of the target well zone.
According to the technical scheme, the on-site acquisition module is used for automatically acquiring data, the runner plan of each to-be-runner well of the main to-be-runner well group is generated according to the data acquired by the acquisition module, and the generation method of the steam distribution plan is combined with the actual situation, so that the steam distribution optimization, the steam injection optimization, the detailed management and the thick oil steam injection cost reduction are facilitated.
Preferably, the reservoir static data includes reservoir property parameters (e.g., geologic property parameters).
Preferably, the dynamic production data includes one or more of a line relationship, a production effect, a steam channeling relationship, a steam injection distance, and the like. Optionally, the production effect comprises fluid production.
Optionally, according to the latest furnace line relation of the target well zone and the steam injection condition of the conventional well, the opening date of each to-be-rotated well in the main to-be-rotated well group and the number of the replacement wells of the main to-be-rotated well group can be determined.
Preferably, as shown in fig. 1, in the embodiment of the present invention, before the step S10, the generation method further includes a step S05 of estimating the number of wells to be steered of the target well region and obtaining the estimated number of wells to be steered.
Through the technical scheme, the user can estimate the number of the to-be-rotated wells needing steam injection in the target well area according to actual conditions, so that the user can preliminarily know the to-be-rotated well condition that the target well area needs steam injection, on the other hand, after the steam distribution plan is generated, the user can compare the to-be-rotated wells with the steam distribution plan according to the estimated number of the to-be-rotated wells, and a certain verification effect is achieved on the accuracy of the generated steam distribution plan.
As shown in fig. 1, in the embodiment of the present invention, after step S41, the generating method further includes step S44 of determining whether values of parameters in the first parameter set of each well to be turned, where a steam channeling phenomenon occurs, are all within a preset range; if yes, performing a step S45 of counting the number of all wells to be turned with steam channeling; if not, the step S46 of abandoning the wheel well to be diverted in which the steam channeling phenomenon occurs is performed.
Through the technical scheme, the to-be-turned wheel wells with the steam channeling phenomenon, the numerical values of all the parameters in the first parameter set are within the preset range, and the step S45 of counting the number of all the to-be-turned wheel wells is performed, so that the number of the to-be-turned wheel wells with the steam channeling phenomenon, the numerical values of all the parameters in the first parameter set are within the preset range, and a foundation is laid for the subsequent steps.
It should be noted that, if only one of the values of each parameter in the first parameter set of the to-be-turned well with the steam channeling phenomenon exceeds the preset range, step S46 is executed on the to-be-turned well with the steam channeling phenomenon, that is, the to-be-turned well with the steam channeling phenomenon is abandoned; the above-mentioned "abandoning" means that the well to be turned which has the steam channeling phenomenon is excluded from the arrangement of selecting and generating the steam distribution plan this time (i.e. the steam distribution plan is not made for the well to be turned which has the steam channeling phenomenon in the generation process of the steam distribution plan this time), and the step S10 is restarted before returning to the step S10 and after the step S05.
As shown in fig. 1, in the embodiment of the present invention, after step S45, the generating method further includes a determining step S50 of determining whether the number of all wells to be turned, where a steam channeling phenomenon occurs, is greater than or equal to the estimated number; if yes, a sequencing step S51 of sequencing all the wells to be steered with the steam channeling phenomenon is executed; if not, step S52 of abandoning all the wells to be diverted where steam channeling occurs is performed.
Through the technical scheme, the number of all the to-be-turned wheel wells with steam channeling can be guaranteed to be larger than or equal to the estimated number after the step S50, so that the safety of steam injection of the to-be-turned wheel wells by the steam injection boiler can be guaranteed, and the steam injection can be optimized.
It should be noted that the "abandoning" in step S52 has the same meaning as the "abandoning" in step S46, and is not described herein again; after the step S50 is determined, if the number of all the wells to be turned which have the steam channeling phenomenon is smaller than the estimated number, the step S52 is executed to discard all the wells to be turned which have the steam channeling phenomenon, because the steam production of the steam injection boiler is constant, and if the number of all the wells to be turned which have the steam channeling phenomenon is smaller than the estimated number, the steam injection amount of each well to be turned which has the steam channeling phenomenon becomes large and exceeds the steam injection amount which can be borne by the well to be turned which causes a risk in the process of injecting steam into all the wells to be turned which have the steam channeling phenomenon by the steam injection boiler, and therefore, it is necessary to ensure that the number of all the wells to be turned which have the steam channeling phenomenon is greater than or equal to the estimated number, and when the number of all the wells to be turned which have the steam channeling phenomenon is smaller than the estimated number, the step S52 is executed.
As shown in fig. 1, in the embodiment of the present invention, the sorting step S51 includes a step S53 of averaging the values of all the parameters in the second parameter set of each steam channeling-occurring turning well, and a step S54 of sorting all the steam channeling-occurring turning wells in order of the average variance from small to large.
In the above technical solution, after the determining step S50, if the number of all the wells to be turned which have the steam channeling phenomenon is greater than or equal to the estimated number, the sorting step S51 is executed, so as to sort all the wells to be turned which have the steam channeling phenomenon; the dispersion degree of the numerical values of all the parameters in the second parameter set of each to-be-turned well can be reflected by solving the mean square error, and the smaller the mean square error is, the smaller the dispersion degree is, the more suitable the to-be-turned well is for preferentially performing steam injection relative to other to-be-turned wells; the steam injection priority orders of all the to-be-converted wells with the steam channeling phenomenon can be determined by sequencing according to the mean square error from small to large, so that the steam distribution and injection can be optimized, and the fine management requirements of the heavy oil field can be met.
It should be noted that the step S53 includes a step of scoring all parameters in the second parameter set of each steam channeling-occurring well to be turned, and a step of calculating a mean square error of the steam channeling-occurring well to be turned according to the scores of all parameters in the second parameter set of each steam channeling-occurring well to be turned.
It should be noted that the scoring step is set for convenience and optimization of the sequence of all the wells to be turned, in which steam channeling occurs; preferably, a scoring condition is added to the scoring method in this step, and the steam channeling information is taken into account. Alternatively, scoring may be done simultaneously based on both the steam channeling information (e.g., the closer the disturbed well is to the steam injection well (there is a steam channeling relationship)) and the well category (the smaller the well category value, the higher the score, e.g., category 1 well is higher than category 2 well score).
Optionally, the well spacing may be divided equally (e.g., the closer the well to be rotated is to the steam injection boiler or station, the higher the well spacing (assuming a diameter of 200 m from the steam injection boiler or station)); the wells can be classified and scored (e.g., based on historical data provided by geological research, i.e., effective thickness, perforation thickness, crude oil viscosity, permeability, porosity, oil saturation, etc.), one type of well, a second type of well, and a third type of well (the first type of well and the second type of well are optimal), wherein the score of the first type of well is higher than that of the second type of well, and the score of the second type of well is higher than that of the third type of well); scoring may be based on horizon, well type (e.g., wells at the same horizon, same well type as a group (same horizon, same well type preferred)); the scores may be based on historical data associated with the well number (e.g., steam channeling data, steam injection boiler or station coordinates, well site coordinates, furnace line relationships, effective thickness, perforation thickness, crude oil viscosity, permeability, porosity, oil saturation, etc.). For wells with steam channeling, in addition to the fact that steam channeling condition information is a necessary condition, technicians can add various scoring conditions according to actual conditions on site so as to score and group the wells to be converted.
The wells are screened and ordered according to six conditions, such as steam channeling conditions, well spacing, oil well types, horizons, well types, static data and the like:
1. steam channeling condition: the closer the disturbed well is to the steam injection well, the higher the disturbed well is (the steam channeling relation is);
2. well spacing: the closer the distance from the rotary shaft to the heat supply station, the higher the distance (within 200 m in diameter);
3. the type of well: according to the historical data provided by the geological research institute, the method comprises the following steps: effective thickness, perforation thickness, crude oil viscosity, permeability, porosity and oil saturation, and screening a first-class well, a second-class well and a third-class well (the first-class well and the second-class well are optimal);
4. horizon and well type: taking wells in the same stratum and the same well type (a vertical well and a horizontal well) as a group (the same layer and the same well type are preferred);
5. static data: historical data associated with the well number includes one or more of steam channeling data, heat supply station (steam injection boiler or steam injection station) coordinates, well location coordinates, furnace line relationships, effective thickness, perforation thickness, crude oil viscosity, permeability, porosity, oil saturation, etc.; sequencing a plurality of to-be-rotated wells by setting an upper limit coefficient for each parameter, wherein if the upper limit coefficient of the oil saturation is set as n, the more to-be-rotated wells which are smaller than n and closer to n need to inject steam, namely, the more to-be-rotated wells are ranked in the sequencing result; optionally, the value of n for each parameter may be determined empirically and/or based on historical data for each parameter; when a plurality of parameters are comprehensively considered to score and sequence all wells to be turned for steam channeling, in addition to the parameter conditions (for example, the upper limit value n is set for each parameter) need to be considered, whether each parameter of the well to be turned has historical data and whether the historical data is sufficient or not need to be considered, for example, when three parameters of effective thickness, perforation thickness and crude oil viscosity are comprehensively considered for two wells A and B, in addition to the three upper limit values n1, n2 and n3 which are respectively set for the three parameters, whether two wells A and B have historical data of effective thickness, perforation thickness and crude oil viscosity and whether the historical data of effective thickness, perforation thickness and crude oil viscosity are sufficient or not need to be considered, if the well A only has historical data of effective thickness and crude oil thickness and does not have historical data of perforation viscosity, and the well B has historical data of effective thickness, perforation thickness, crude oil viscosity, Historical data of perforation thickness and crude oil viscosity, then the score of the well B is higher than that of the well A; if both wells A and B have historical data on effective thickness, perforation thickness, and crude oil viscosity, but the A well has only three months of historical data and the B well has one year of historical data, then the score for the B well is higher than the A well. By analogy, all wells to be turned which have steam channeling can be scored and sequenced by comprehensively considering a plurality of parameters.
Preferably, C, D two wells are calculated and scored according to 6 parameters such as steam channeling condition, well spacing, oil well type, horizon, well type and static data, and each index score is obtained in sequence:
and C, well C: {95, 85, 75, 65, 55, 45}
D, well D: {73, 72, 71, 69, 68, 67}
The mean of the two groups is 70, and according to the calculation formula of the mean square error (the square sum of the mean value is subtracted from all the numbers, the obtained result is divided by the number (or the number is reduced by one) of the group of numbers, and the obtained value is given as the root, and the obtained number is the mean square error of the group of data), the mean square error of the C well is 17.07 minutes, the mean square error of the D well is 2.37 minutes, and the difference between the C wells is much larger than the difference between the D wells.
The higher the mean square error, the more discrete, that is to say less accurate, the experimental data are represented. Conversely, the lower the mean square error, the more accurate the data representing the experiment, and therefore, the more satisfactory the D well number.
As shown in fig. 1, in the embodiment of the present invention, after the sorting step S51, the generating method further includes a step S55: selecting the wheel wells to be rotated, wherein the occurrence frequency of the steam channeling phenomenon is more than or equal to N, and N is an integer more than or equal to 1, from all the wheel wells to be rotated, wherein the steam channeling phenomenon occurs.
In the technical scheme, the to-be-rotated well with the occurrence frequency of the steam channeling phenomenon being more than or equal to N needs to be injected with steam preferentially than the to-be-rotated well with the occurrence frequency of the steam channeling phenomenon being less than N; after the sorting step S51, step S55 is executed to screen out the wells to be wheeled with the occurrence frequency of the steam channeling phenomenon being greater than or equal to N (i.e., the occurrence frequency of the steam channeling phenomenon is high), so that not only is the sorting result (i.e., the steam injection requirement sequence) retained, but also the wells to be wheeled requiring steam injection with the preferred selection are further screened, thereby ensuring the optimized steam injection and meeting the fine management requirement of the heavy oil field.
Preferably, the value of N may be set according to the experience of field personnel.
As shown in fig. 1, in the embodiment of the present invention, the generating method further includes a step S56 of grouping all wells to be steered whose occurrence frequency of the steam channeling is greater than or equal to N to obtain an alternative group of wells to be steered.
By the technical scheme, the alternative to-be-turned well group is obtained, a foundation can be laid for the subsequent generation of a steam distribution plan, the optimized steam injection of each heavy oil well in a target well area is realized, and the fine management requirement of the heavy oil field is met.
Preferably, in step S56, according to the screening condition of the steam channeling generating wells to be turned in step S55, all the steam channeling generating wells to be turned are grouped by combining each parameter in the third parameter set of each steam channeling generating well to be turned to obtain the alternative well group to be turned.
Optionally, the generating method further comprises the step of grouping all the wells to be turned, of which the occurrence frequency of the steam channeling phenomenon is greater than or equal to N, according to the steam injection distance, the furnace line relation and the like. If the steam injection distance is set to be m, a circle is formed by taking the steam injection boiler as the center and taking the m as the radius, all the to-be-rotated wheel wells in the circle range can be divided into a group, and all the to-be-rotated wheel wells in the group of to-be-rotated wheel wells can be subjected to steam injection by the steam injection boiler.
In step S56, grouping all the wells to be steered whose occurrence frequency of the steam channeling phenomenon is greater than or equal to N by using the above grouping step to obtain an alternative well group to be steered; and each to-be-rotated well in each to-be-rotated well group after being grouped corresponds to one steam injection boiler, and the steam injection boilers are used for injecting steam for each to-be-rotated well in the to-be-rotated well group.
As shown in fig. 1, in the embodiment of the present invention, after the step S56, the generating method further includes a step S60: and generating a turning plan of each to-be-turned well of the alternative to-be-turned well group according to the static oil deposit data and the dynamic production data of the target well zone.
According to the technical scheme, the on-site acquisition module is used for automatically acquiring data, the runner plan of each to-be-runner well of the alternative to-be-runner well group is generated according to the data acquired by the acquisition module, and the generation method of the steam distribution plan is combined with the actual situation, so that the steam distribution optimization, the steam injection optimization, the detailed management and the thick oil steam injection cost reduction are facilitated.
Optionally, according to the latest furnace line relation of the target well zone and the steam injection condition of the conventional well, the opening date of each well to be rotated in the alternative well group to be rotated and the number of the alternative wells in the alternative well group to be rotated can be determined.
As shown in fig. 1, in the embodiment of the present invention, the generating method further includes:
step S70: generating a steam distribution plan according to the rotating wheel plan of each to-be-rotated wheel well and by combining the steam distribution dynamic indexes of each to-be-rotated wheel well;
step S75: and adjusting the steam distribution plan.
According to the technical scheme, the rotating wheel plan of each rotating wheel well to be rotated is combined with the steam distribution dynamic index to generate a steam distribution plan, and the steam distribution plan is adjusted to obtain a final steam distribution plan; in the generation process of the steam distribution plan, the steam distribution plan of the heavy oil well is established by applying an on-site acquisition module to automatically acquire data according to the data acquired by the acquisition module, and the steam distribution plan and the steam injection effect are subjected to big data analysis, so that the efficient management of the steam distribution of the single well in the heavy oil block is realized, the steam distribution and the steam injection are optimized, and the heavy oil steam injection cost of an operation area is reduced.
Preferably, the dynamic steam distribution index of each well to be turned can be determined according to the steam injection frequency of each well to be turned; optionally, when the number of steam injection turns is less than or equal to 8, the steam distribution dynamic index can be determined by referring to a thick oil conventional throughput steam injection strength optimization table, and when the number of steam injection turns is greater than 8, the steam injection strength can be increased or decreased according to the situation of the upper-turn steam production injection ratio.
Of course, in an alternative embodiment not shown in the drawings of the present invention, the steam distribution dynamic index of each well to be turned may also be determined according to the steam injection strength plan of the target well zone for each well to be turned according to the actual situation.
It should be noted that the steam distribution dynamic index may be determined according to a steam injection intensity plan arranged by the target well zone for each well to be turned in any form.
Preferably, the steam distribution plan may be adjusted by means of manual intervention, wherein the adjustment includes adjustment of a furnace line relationship and/or a steam injection amount, and the like.
According to the technical scheme, the large data of the computer is used for analyzing the production conditions of single wells and blocks, optimizing screening and sequencing are performed, the steam distribution plan is automatically generated, and the integration of the flattening of the heavy oil production management, the intellectualization of boiler steam injection management control and the production decision is gradually realized in a mode of combining with manual intervention, so that the optimization of steam injection, the detailed management are finally realized, and the steam injection cost of the heavy oil is reduced.
Preferably, according to the generated final steam distribution plan, steam distribution is carried out on each well to be turned, and quality tracking is carried out on each well to be turned. Optionally, the quality tracking comprises tracking of single well steam injection quality, boiler steam injection quality, block steam injection quality and the like. The technical scheme is convenient for managers to track the steam distribution effect in time, adjust the steam distribution plan, optimize the steam injection measure, track the steam injection production effect in time and reduce the steam injection cost for developing the thickened oil.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: according to the technical scheme, the large data of the computer is used for analyzing the production conditions of single wells and blocks, optimizing screening and sequencing are performed, the steam distribution plan is automatically generated, and the integration of the flattening of the heavy oil production management, the intellectualization of boiler steam injection management control and the production decision is gradually realized in a mode of combining with manual intervention, so that the optimization of steam injection, the detailed management are finally realized, and the steam injection cost of the heavy oil is reduced.
It is to be understood that the above-described embodiments are only a few, 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.
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 example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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.
Claims (12)
1. A method for generating a steam distribution plan for a heavy oil well, the method comprising:
step S10: screening out a plurality of to-be-rotated wells of a target well area, which need to be subjected to steam injection;
step S20: sequencing the multiple wells to be turned;
step S30: detecting each well to be rotated;
step S40: judging whether each well to be turned has a steam channeling phenomenon, if so, executing a step S41 of selecting the well to be turned with the steam channeling phenomenon; if not, the step S42 of reserving the sequencing situation of the wells to be steered is executed, and the step S43 of grouping all the wells to be steered without the steam channeling phenomenon is executed to obtain the main well group to be steered.
2. The method of generating as claimed in claim 1, wherein after the step S41, the method further comprises a step S44 of determining whether the values of the parameters in the first parameter set of each well to be steered for which a steam channeling phenomenon occurs are all within a preset range; if yes, performing a step S45 of counting the number of all wells to be turned with steam channeling; if not, the step S46 of abandoning the well to be steered where the steam channeling phenomenon occurs is performed.
3. The generation method according to claim 2,
before the step S10, the generating method further includes a step S05 of estimating the number of wells to be steered of the target well region and obtaining the estimated number of wells to be steered;
after the step S45, the generating method further includes a step S50 of determining whether the number of all wells to be turned, in which the steam channeling occurs, is greater than or equal to the estimated number; if yes, a sequencing step S51 of sequencing all the wells to be steered with the steam channeling phenomenon is executed; if not, step S52 of abandoning all the wells to be diverted where steam channeling occurs is performed.
4. The method of claim 3, wherein the sorting step S51 includes a step S53 of averaging the values of all parameters in the second parameter set of each steam channeling-occurring well to be turned, and a step S54 of sorting all the steam channeling-occurring wells to be turned in the order of the average variance from small to large.
5. The generation method according to claim 3, wherein after the sorting step S51, the generation method further comprises a step S55: and selecting the wheel wells to be rotated, wherein the occurrence frequency of the steam channeling phenomenon is more than or equal to N, and N is an integer more than or equal to 1, from all the wheel wells to be rotated, wherein the steam channeling phenomenon occurs.
6. The generation method according to claim 5, further comprising a step S56 of grouping all wells to be steered with a frequency of occurrence of steam channeling being equal to or greater than N to obtain an alternative well group to be steered.
7. The method of generating as claimed in claim 1 or 6, further comprising the step of grouping the wells to be turned according to steam injection distance and furnace line relationship.
8. The generation method according to claim 6, wherein after the step S56, the generation method further includes a step S60: and generating a turning plan of each to-be-turned well of the alternative to-be-turned well group according to the oil deposit static data and the dynamic production data of the target well zone.
9. The generation method according to claim 1, characterized in that after the step S43, the generation method further comprises a step S65: and generating a rotating wheel plan of each rotating wheel well to be rotated of the main rotating wheel well group to be rotated according to the oil deposit static data and the dynamic production data of the target well zone.
10. The generation method according to claim 8 or 9, characterized in that the generation method further comprises:
step S70: generating a steam distribution plan according to the rotating wheel plan of each to-be-rotated wheel well and by combining the steam distribution dynamic indexes of each to-be-rotated wheel well;
step S75: and adjusting the steam distribution plan.
11. The generation method of claim 2, wherein the first set of parameters includes one or more of a block in which each well is located, a firing line relationship, a well pattern, a number of days in production, a fluid production volume, an average fluid production volume, and a water cut.
12. The generation method of claim 4, wherein the second set of parameters includes one or more of well classification, steam channeling information, well spacing, effective thickness, perforation thickness, crude oil viscosity, permeability, porosity, and oil saturation.
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