CN109653717B - Single-well steam huff-puff and puff steam flee post-combination huff-puff well selection decision method - Google Patents
Single-well steam huff-puff and puff steam flee post-combination huff-puff well selection decision method Download PDFInfo
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Abstract
The invention provides a single-well steam huff-puff and steam flee post-combination huff-puff well selection decision method, which comprises the following steps: the ratio of the number of the steam channeling passages of each well in the research area to the total number of the steam channeling passages in the research area is obtained to obtain the dimensionless number of the steam channeling passagesn c(ii) a The ratio of the steam flooding area of each well in the research area during steam huff and puff to the heating range of the well before steam channeling is obtained to obtain the dimensionless steam flooding areaR h(ii) a Determining the effective thickness of the oil layer and the thickness of the stratum in the control range of each well in the research area through the fine oil reservoir description, calculating the ratio of the effective thickness to the thickness of the stratum to obtain the net total ratioh t(ii) a Calculating a combined throughput well selection decision index A of each well in a research areadiAnd according to AdiSorting the wells in the research area according to the size; and preferably selecting the combination which meets the constraint conditions of the steam injection boiler and the pipe network trend of the research block and has the maximum sum of the combined well selection indexes. The method reduces the blindness of implementing combined huff and puff well selection in the single-well steam huff and puff steam channeling area, enables the decision result to be more scientific and reasonable, and provides solid theoretical guidance for implementing combined steam huff and puff in a mine field.
Description
Technical Field
The invention relates to the field of heavy oil reservoir thermal recovery development research, in particular to a single-well steam huff-puff and puff-puff combined huff-puff well selection decision method.
Background
The combined steam huff and puff is an effective technology for improving the recovery ratio of the heavy oil reservoir after high-frequency huff and puff by combining a plurality of adjacent wells to perform centralized and ordered steam injection, well stewing and oil extraction, thereby effectively controlling the steam channeling among the wells and improving the uneven utilization. At present, a large amount of indoor mechanism research and mine field practice are carried out on the combined steam huff-puff technology at home and abroad, but the systematic research is not carried out on the combined huff-puff well selection method, and when the combined steam huff-puff technology is implemented in a mine field, adjacent steam channeling wells are simply combined together, scientific basis is lacked, and the subjectivity and blindness in operation are strong. Therefore, a novel single-well steam huff-puff and steam flee post-combination huff-puff well selection decision method is invented, and the technical problems are solved.
Disclosure of Invention
The invention aims to provide a single-well steam huff-puff and huff-puff post-combination well selection decision method for realizing scientific and gradual implementation of combination steam huff and puff on a heavy oil reservoir so as to effectively control the problems of steam channeling among wells and unbalanced utilization.
The object of the invention can be achieved by the following technical measures: the method for deciding the combined huff-and-puff well selection after the single-well steam huff-and-puff steam fleeing comprises the following steps: step 1, calculating the ratio of the number of steam channeling channels of each well in a research area to the total number of the steam channeling channels in the research area to obtain the dimensionless number n of the steam channeling channelsc(ii) a Step 2, solving the ratio of the steam flooding area of each well in the research area during steam huff and puff of the single well to the heating range of the well before steam channeling to obtain a dimensionless steam flooding surfaceProduct Rh(ii) a Step 3, determining the effective thickness of the oil layer and the thickness of the stratum in the control range of each well in the research area through the fine oil reservoir description, calculating the ratio of the effective thickness to the thickness of the stratum, and obtaining the net total ratio ht(ii) a Step 4, calculating a combined throughput well selection decision index A of each well in the research areadiAnd according to AdiSorting the wells in the research area according to the size; and 5, preferably selecting the combination which meets the constraint conditions of the steam injection boiler and the pipe network trend of the research block and has the maximum sum of the combined well selection indexes.
The object of the invention can also be achieved by the following technical measures:
in step 1, by monitoring the temperature, the liquid production amount, the oil production amount and the water content change condition of the well heads of the adjacent production wells during the steam injection of each well in the research area, whether the well and each adjacent production well generate steam channeling is judged, and the number of the wells with direct channeling channels between the wells is the number of the steam channeling channels of the well.
In step 1, the criterion for determining that direct steam channeling with adjacent production wells occurs when each well injects steam is one of the following characteristics: the method comprises the steps of firstly, increasing oil production in the production process, and raising the temperature of a well head; the second expression is that the liquid production amount is increased, the water content is increased and the temperature of the well head is increased in the production process; and thirdly, when the adjacent wells inject steam, the water yield of the production well rises sharply, even the water content is close to 100%, and the steam flash evaporation phenomenon exists at the well mouth.
In step 2, a steam channeling mathematical model between wells is established according to a steam channeling physical model between wells, and the steam flooding area S of each well in the research area when steam is huffed and puff in each wellsf：
There is no factor of flooding area
Wherein L isk-well spacing, m; r (t)i) -heating radius, m.
In step 4, the more the heating range isThe smaller the weight of the well selection decision is if the well selection decision is large; the larger the longitudinal mobility degree is, the larger the well selection decision weight is, and the larger the number of the current steam channeling channels is, the larger the well selection decision weight is; according to the principle, a combined throughput well selection decision index A is constructeddi：
In step 5, all two-well combined throughput and three-well combined throughput alternative schemes which are suitable for the actual conditions of the mine boiler and the pipe network are listed, and the combination which meets the steam injection boiler and the pipe network trend constraint conditions of the research block and has the maximum sum of combined well selection indexes is preferably selected.
In step 5, selecting two-well combined throughput or three-well combined throughput according to the actual conditions of a boiler and a pipe network in a mine field, wherein if the two-well combined throughput is selected, a direct steam channeling channel must exist between two wells, and the larger the sum of combined well selection indexes is, the higher the alternative degree is; if the three wells are selected to be combined for handling, firstly, the well with the larger well selection index is used as a central well, direct cross flow channels must exist between the other two wells and the central well, and the larger the sum of the combined well selection indexes is, the higher the alternative degree is.
According to the method for making the combined huff-and-puff well selection decision after single-well steam huff-and-puff, factors for expanding the heating range of a production well are researched, a well selection decision index during combined huff-and-puff under multiple main control factors is established, and the well in the area needing combined huff-and-puff is orderly and gradually produced in a combined mode. Compared with the traditional combined well selection method applied to the mine field, the well selection decision method provided by the invention closely combines the oil reservoir conditions and the production reality, overcomes the subjectivity, obviously enhances the scientificity, better solves the well selection problem of combined steam throughput, and provides a solid theoretical guidance for the implementation of the combined steam throughput in the mine field.
Drawings
FIG. 1 is a flow diagram of one embodiment of a single well steam stimulation post-steam-channeling combined stimulation well selection decision-making method of the present invention;
FIG. 2 is a schematic view of a channeling direction in a research area according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a simplified physical model for interwell steam channeling in an embodiment of the present invention;
fig. 4 is a diagram illustrating a combined throughput decision index for a study area according to 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.
Indoor research shows that the larger the heating radius is, the larger the heated area of an oil layer is, the more balanced the oil layer is, and the smaller the yield-increasing effect is after combined huff and puff; the larger the oil layer thickness is, the more serious the longitudinal steam overlap is, the larger the potential of the steam injection longitudinal steering is, and the larger the yield increasing effect is after the combined huff and puff is; at present, the more the number of the steam channeling channels is, the greater the loss caused by steam channeling is, and the greater the yield-increasing effect after the combined huff and puff is. In order to eliminate the influence of the whole oil reservoir and the development condition of the research area, the main control factors influencing the yield increasing effect after the combined huff and puff are subjected to dimensionless treatment, and on the basis, a combined huff and puff well selection decision index is constructed. And performing combined huff-puff well selection according to the decision index of each well and the actual conditions of a mine site boiler and a pipe network.
As shown in fig. 1, fig. 1 is a flow chart of the single well steam throughput steam channeling post-combination throughput well selection decision method of the present invention.
In step 101, by monitoring the temperature, the liquid production amount, the oil production amount and the water content change condition of the well heads of the adjacent production wells during the steam injection of each well in the research area, whether the well and each adjacent production well generate steam channeling is judged, and the number of the wells with direct channeling channels between the wells is the number of the steam channeling channels of the well. The criterion for judging that direct steam channeling is generated between each well and an adjacent production well when steam is injected is one of the following conditions when the adjacent production well is monitored: the method comprises the steps of firstly, increasing oil production in the production process, and raising the temperature of a well head; the second expression is that the liquid production amount is increased, the water content is increased and the temperature of the well head is increased in the production process; and thirdly, when the adjacent wells inject steam, the water yield of the production well rises sharply, even the water content is close to 100%, and the steam flash evaporation phenomenon exists at the well mouth.
Establishing a steam channeling mathematical model between wells during steam huff-puff of a single well according to a steam channeling physical model between wells, and calculating a steam flooding area S during steam huff-puff of the single well of each well in a research areasf：
There is no factor of flooding area
Wherein L isk-well spacing, m; r (t)i) Heating radius (calculated by the Marx-Langenheim equation), m.
103, determining the effective thickness of an oil layer and the thickness of a stratum in the control range of each well in the research area through the fine oil reservoir description, and calculating the ratio of the effective thickness to the thickness of the stratum to obtain a net total ratio ht；
104, calculating a combined throughput well selection decision index A of each well in the research areadiAnd according to AdiSorting the wells in the research area according to the size;
since the yield-increasing effect of heated oil reservoirs depends on the heating range of the oil reservoir and the heating strength (viscosity reduction degree) of crude oil, all measures which are favorable for increasing the heating range have a positive influence on the yield-increasing effect. Obviously, the larger the heating range is, the smaller the well selection decision weight is; the larger the longitudinal movement use degree is, the larger the well selection decision weight is, and the larger the number of the current steam channeling channels is, the larger the well selection decision weight is. According to the principle, a combined throughput well selection decision index A is constructeddi：
And 105, listing all two-well combined throughput and three-well combined throughput alternative schemes which are suitable for the actual conditions of the mine boilers and pipe networks, and preferably selecting the combination which meets the steam injection boilers and pipe network trend constraint conditions of the research block and has the largest sum of combined well selection indexes. Generally selecting two-well combined throughput or three-well combined throughput according to the actual conditions of a boiler and a pipe network in a mine field, wherein if the two-well combined throughput is selected, a direct steam channeling channel must exist between two wells, and the larger the sum of combined well selection indexes is, the higher the alternative degree is; if the three wells are selected to be combined for handling, firstly, the well with the larger well selection index is used as a central well, direct cross flow channels must exist between the other two wells and the central well, and the larger the sum of the combined well selection indexes is, the higher the alternative degree is.
In one embodiment of the present invention, the method comprises the following steps:
step 1, monitoring the temperature, the liquid production amount, the oil production amount and the water content change of adjacent production well heads when each well in a research area injects steam, judging whether the well and each adjacent production well directly generate steam channeling, determining the number of steam channeling channels of the well and the total number of steam channeling channels in the research area, calculating the ratio of the number of the steam channeling channels of the well and the total number of the steam channeling channels in the research area, and obtaining the number n of dimensionless steam channeling channelsc；
Table 1 is a steam channeling status statistics table of a research area according to an embodiment of the present invention, in which steam channeling statuses of wells in the research area are counted and analyzed according to monitoring results.
TABLE 1 Single 56-13-XN5 statistical table for steam channeling of well region
Fig. 2 is a schematic view of a steam channeling direction in a research area according to an embodiment of the present invention, in which the steam channeling direction between wells in the research area is labeled according to a monitoring result. And counting the number of steam channeling channels of each steam channeling well in the research area and the total number of the steam channeling channels in the research area according to the graph, and calculating the ratio to obtain the dimensionless number nc of the steam channeling channels of each steam channeling well.
In step 2, according to the visual physical simulation result, a steam channeling channel (a steam flooding range) formed between wells presents in the process of steam injection through steam stimulation of a single wellA wedge shape. The shape can be regarded as a region formed by a heating range of the steam channeling well before steam channeling and a tangent line of the steam channeling well. When no steam channeling occurs, the heating range of the steam huff-and-puff well has a radius r (t)i) The circular area of (a); after the gas channeling between wells, 2 bottoms are formed between the gas injection well and the adjacent well
Height is r (t)i) The area S of the wedge-shaped steam flooding range formed by the right-angle trianglessfThe calculation formula of (2) is as follows:
there is no factor of flooding area
Wherein L isk-well spacing, m; r (t)i) Heating radius (calculated by the Marx-Langenheim equation), m.
FIG. 3 is a simplified physical model of interwell steam channeling in an embodiment of the present invention.
And 3, determining the effective thickness of the oil layer and the thickness of the stratum in the control range of each well in the research area through the fine oil reservoir description, and calculating the ratio of the effective thickness to the thickness of the stratum to obtain the net total ratio ht.
Table 2 is a steam channeling parameter calculation table in a research area in an embodiment of the present invention, and relevant steam channeling parameters in the research area can be calculated by using the methods provided in steps 1 to 3.
TABLE 2 Single 56-13-XN5 steam channeling parameter calculation table for well region
In step 4, since the yield-increasing effect of the heated oil reservoir depends on the heating range of the oil reservoir and the heating strength (viscosity reduction degree) of the crude oil, all measures which are favorable for increasing the heating range have a positive effect on improving the yield-increasing effect. Obviously, the larger the heating radius is, the larger the heated area of the oil layer is, the more balanced the oil layer is, and the smaller the yield-increasing effect is after the combined huff and puff; the larger the oil layer thickness is, the more serious the longitudinal steam overlap is, the larger the potential of the steam injection longitudinal steering is, and the larger the yield increasing effect is after the combined huff and puff is; at present, the more the number of the steam channeling channels is, the greater the loss caused by steam channeling is, and the greater the yield-increasing effect after the combined huff and puff is. In order to eliminate the influence of the whole oil reservoir and the development condition of a research area, the main control factors influencing the yield increasing effect after the combined huff and puff are subjected to dimensionless treatment, and on the basis, a combined huff and puff well selection decision index Adi is constructed:
and calculating a combined throughput well selection decision index Adi of each well in the research area, sequencing each well in the research area according to the size of the Adi, and making a combined throughput decision index annotation graph of the research area. Table 3 is a throughput decision index ranking table combined with a study area according to a specific embodiment of the present invention, and the larger the Ad i is, the higher the well selection priority is in combination.
TABLE 3 Single 56-13-XN5 well combination throughput decision index ranking Table
Fig. 4 is a diagram illustrating a combined throughput decision index for a study area according to an embodiment of the present invention. The flow proceeds to step 5.
And step 5, according to the sorting result of the well selection decision indexes of all wells in the research area, listing all two-well combined throughput and three-well combined throughput alternative schemes which are suitable for the actual conditions of the mine site boiler and the pipe network, and preferably selecting the combination which meets the steam injection boiler and pipe network trend constraint conditions of the research area and has the maximum sum of the combined well selection indexes. Table 4 is a table of alternatives of combined throughput of a research area in a specific embodiment of the present invention, and lists all alternatives of combined throughput of two wells and combined throughput of three wells adapted to actual situations of a boiler and a pipe network in a mine.
TABLE 4 Single 56-13-XN5 well combination throughput alternatives Table
If the combined throughput of the two wells is selected, a direct steam channeling channel must exist between the two wells, and the larger the sum of the combined well selection indexes is, the higher the alternative degree is; if three wells are selected for combined handling, firstly, a well with a large well selection index is used as a central well, direct cross flow channels must exist between the other two wells and the central well, and the larger the sum of the combined well selection indexes is, the higher the alternative degree is; finally, the optimal combination is determined by combining the steam injection boiler and the pipe network trend of a specific research block. The flow ends.
The above-mentioned embodiments are only for understanding the present invention, and are not intended to limit the technical solutions of the present invention, and those skilled in the art can make various changes or modifications based on the technical solutions described in the claims, and all equivalent changes or modifications should be covered by the scope of the claims of the present invention. The present invention is not described in detail, but is known to those skilled in the art.
Claims (5)
1. The method for deciding the combined huff-and-puff well selection after single-well steam huff-and-puff steam fleeing is characterized by comprising the following steps of:
step 1, calculating the ratio of the number of steam channeling channels of each well in a research area to the total number of the steam channeling channels in the research area to obtain the dimensionless number n of the steam channeling channelsc；
Step 2, solving the ratio of the steam flooding area when the steam of each well in the research area is huff and puff to the heating range of the well before steam channeling to obtain the dimensionless steam flooding area Rh；
Step 3, determining the effective thickness of the oil layer and the thickness of the stratum in the control range of each well in the research area through the fine oil reservoir description, calculating the ratio of the effective thickness to the thickness of the stratum, and obtaining the net total ratio ht；
Step 4, calculating each well in the research areaCombined throughput well selection decision index AdiAnd according to AdiSorting the wells in the research area according to the size;
step 5, satisfying the combined throughput alternative scheme which is used for researching the constraint conditions of the steam injection boilers and the pipe network trends and has the maximum sum of combined throughput well selection decision indexes;
in step 4, the weight of well selection decision is smaller according to the larger heating range; the larger the longitudinal mobility degree is, the larger the well selection decision weight is, and the larger the number of steam channeling channels is, the larger the well selection decision weight is, so as to construct a combined throughput well selection decision index AdiComprises the following steps:
2. the method for deciding the post-huff and puff combination of the single-well steam huff and puff decision-making method according to claim 1, wherein in the step 1, whether the steam puff is generated between the well and each adjacent production well is judged by monitoring the change conditions of the well head temperature, the liquid production amount, the oil production amount and the water content of the adjacent production well during the steam injection of each well in the research area, and the number of the wells with direct blowby channels between the wells is the number of the steam blowby channels of the well.
3. The method for making a combined huff-and-puff well selection decision after single-well steam huff and steam puff according to claim 1, wherein in the step 2, a mathematical model of the steam puff among the single-well steam huff is established according to a physical model of the steam puff among the wells, and a steam flooded area S of each well in the research area during the single-well steam huff and steam puff is calculatedsf：
There is no factor of flooding area
Wherein L isk-well spacing, m; r (t)i) Heating the halfDiameter, m.
4. The single-well steam-throughput and steam-channeling post-combination throughput well selection decision method according to claim 1, characterized in that in step 5, all two-well combination throughput and three-well combination throughput alternatives which adapt to the actual situation of a mine boiler and a pipe network are listed, and then the combination which meets the constraint conditions of the steam injection boiler and the pipe network in the research block and has the largest sum of the decision indexes of the combination throughput well selection is preferably selected.
5. The single-well steam throughput and post-steam channeling combined throughput well selection decision method according to claim 4, wherein in step 5, according to actual conditions of a mine site boiler and a pipe network, a two-well combined throughput or a three-well combined throughput is selected, if the two-well combined throughput is selected, a direct steam channeling channel must exist between two wells, and the larger the sum of combined throughput well selection decision indexes is, the higher the alternative degree is; if the three-well combined throughput is selected, the well with the larger decision index is selected as the central well according to the combined throughput, direct cross flow channels must exist between the other two wells and the central well, and the larger the sum of the combined throughput decision indexes is, the higher the alternative degree is.
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