CN111322055A - Method and device for developing thin-difference oil layer well pattern reconstruction - Google Patents
Method and device for developing thin-difference oil layer well pattern reconstruction Download PDFInfo
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Abstract
The invention discloses a method and a device for developing thin and poor oil reservoir well pattern reconstruction, which relate to the technical field of oil and gas reservoir development, wherein the method for developing thin and poor oil reservoir well pattern reconstruction comprises the following steps: setting a well pattern reconstruction scheme aiming at the thin difference reservoir, wherein the well pattern reconstruction scheme at least comprises the following two schemes: in the scheme I, a polymer flooding injection well is used for water flooding well displacement, a polymer flooding extraction well is used for water flooding well displacement, a polymer flooding injection well is used for water flooding well displacement, and a polymer flooding extraction well is used for water flooding well displacement; respectively determining the total extraction degree of each scheme, and respectively determining the total benefit of each scheme according to the total extraction degree of each scheme and the total investment cost of each scheme; and determining the well pattern reconstruction scheme according to the total benefits of the schemes. The problems that the water-drive well pattern oil-water well ratio of a thin and poor oil layer is large, the sand control degree is low, the injection-production well spacing reduces the communication direction of well groups, the average single well oil increment is small, and the water content is large are solved.
Description
Technical Field
The invention relates to the technical field of oil and gas reservoir development, in particular to a method and a device for developing thin difference oil layer well pattern reconstruction, and particularly relates to a method and a device for exploiting a thin difference oil layer, namely an oil layer with the thickness of less than or equal to 0.5m, by comprehensively utilizing water and polymer flooding well patterns.
Background
Aiming at the problem of poor development effect of a thin and poor oil layer, a corresponding limit fracturing test of an oil-water well is developed in a low-yield low-efficiency well in the apricot and south development area in 2013 (research on seepage characteristics of a precisely controlled fracturing reservoir layer and injection and production well condition parameters in the apricot and south development area [ D ] northeast petroleum university, 2016), namely, the seepage capability is improved and effective utilization of the thin and poor oil layer is realized by simultaneously fracturing and transforming corresponding sand bodies of the oil-water well. The measures after implementation have good effects, the liquid increase of a single well is 35.5t, the oil increase is 6.3t, the water content is reduced by 2.4 percentage points, and the flowing pressure is increased by 1.2 MPa. This method has 2 disadvantages: firstly, the precision control fracturing cost is high, the investment is large, and the economic benefit is poor; 2. after the measure, the later stage of the partial well is decreased progressively, and the measure effect is deteriorated.
In 2017, high-navigation (research on a method for improving water drive development effect through well pattern recombination, northeast petroleum university [ D ] 2017) proposes that injection and production well distances are reduced by comprehensively utilizing primary deviated wells, secondary wells and tertiary wells in a block, and the water drive oil layer development efficiency is improved. The high-altitude method has 3 inadaptations: firstly, the workload of hole repairing and plugging measures is large, the injection-production relation is still incomplete when part of well grids are combined, and drilling is needed; secondly, the well pattern layer is complex after the well pattern is reconstructed, and the development and adjustment difficulty is high; and thirdly, the high permeability zone well pattern is influenced to a certain extent.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for developing thin and differential oil layer well pattern reconstruction, so as to solve the problems of large oil-water ratio of the water-driving well pattern of the thin and differential oil layer, low sand control degree, reduced well group communication direction due to injection and production well spacing, small average single well oil increment, and large water content.
First, the present invention provides a method for developing thin-error reservoir well pattern reconstruction, comprising:
setting a well pattern reconstruction scheme aiming at the thin difference reservoir, wherein the well pattern reconstruction scheme at least comprises the following two schemes: in the scheme I, a polymer flooding injection well is used for water flooding well displacement, a polymer flooding extraction well is used for water flooding well displacement, a polymer flooding injection well is used for water flooding well displacement, and a polymer flooding extraction well is used for water flooding well displacement;
respectively determining the total extraction degree of each scheme, and respectively determining the total benefit of each scheme according to the total extraction degree of each scheme and the total investment cost of each scheme;
determining the well pattern reconstruction scheme according to the total benefits of the schemes;
wherein the thickness of the thin oil difference layer is less than or equal to 0.5 m.
Preferably, the method for respectively calculating the total extraction degree of each scheme is the same as that of each scheme, and comprises the following steps: respectively determining the production degree of the water drive well of each scheme and the production degree of the polymer drive well of each scheme;
the total production degree of each scheme = the production degree of the water drive well of each scheme + the production degree of the polymer drive well of each scheme;
and/or the presence of a gas in the interior of the container,
the method for determining the total benefit of each scheme according to the total extraction degree of each scheme and the total investment cost of each scheme is the same, wherein the total benefit of each scheme = the total investment cost of each scheme × of the total extraction degree of each scheme.
Preferably, the method for determining the production degree of the water-drive well of each scheme comprises the following steps: respectively determining the accumulated oil production of the water-driving wells of the schemes and the geological reserves of the water-driving wells of the schemes, wherein the production degree of the water-driving wells of the schemes = the accumulated oil production of the water-driving wells of the schemes divided by the geological reserves of the water-driving wells of the schemes;
the method for determining the production degree of the polymer flooding well of each scheme comprises the following steps: and respectively determining the accumulated oil production of the polymer flooding well of each scheme and the geological reserves of the polymer flooding well of each scheme, wherein the production degree of the polymer flooding well of each scheme = the accumulated oil production of the polymer flooding well of each scheme divided by the geological reserves of the polymer flooding well of each scheme.
Preferably, the method for determining the accumulated oil production of the water-drive wells of each scheme comprises the following steps: respectively fitting the predicted well condition parameters of the single water drive well of each scheme by using the actual well condition parameters of the single water drive well of each scheme, respectively obtaining the fitting precision of each scheme according to the actual well condition parameters of the single water drive well of each scheme and the predicted well condition parameters of the single water drive well of each scheme, predicting the accumulated oil production of the water drive well of each scheme when the fitting precision of each scheme reaches the set fitting precision of the water drive well, keeping the water injection quantity of the single water drive well of each scheme unchanged, and determining the accumulated oil production of the water drive well of each scheme when the comprehensive water content reaches the set comprehensive water content of the water drive well;
the method for determining the accumulated oil production of the polymer flooding well of each scheme comprises the following steps: respectively utilizing the actual well condition parameters of the polymer flooding well single well of each scheme to fit the predicted well condition parameters of the polymer flooding well single well of each scheme, respectively obtaining the fitting precision of each scheme according to the actual well condition parameters of the polymer flooding well single well of each scheme and the predicted well condition parameters of the polymer flooding well single well of each scheme, predicting the accumulated oil production of the polymer flooding well of each scheme when the fitting precision of each scheme reaches the set fitting precision of the polymer flooding well, keeping the water injection quantity of the single well of the polymer flooding well unchanged, and determining the accumulated oil production of the polymer flooding well of each scheme when the comprehensive water content reaches the set comprehensive water content of the polymer flooding well;
the method for determining the geological reserves of the water-drive wells of the schemes comprises the following steps: respectively establishing a water-drive well anatomical geological model of each scheme, and respectively obtaining the geological reserves of the water-drive wells of each scheme by using the water-drive well anatomical geological model of each scheme;
the method for determining the geological reserves of the polymer flooding wells of each scheme comprises the following steps: and respectively establishing polymer flooding well anatomical geological models of all schemes, and respectively obtaining the geological reserves of the polymer flooding wells of all schemes by using the polymer flooding well anatomical geological models of all schemes.
Preferably, the total investment cost of each scheme at least comprises: well condition survey costs for each of the scenarios, overhaul costs for each of the scenarios, operating costs for each of the scenarios, hole patching costs for each of the scenarios, fracturing costs for each of the scenarios, and plugging costs for each of the scenarios.
Preferably, before the well pattern reconstruction scheme is set for the thin difference oil layer, whether the thin difference oil layer meets the well pattern reconstruction condition is judged;
if the well pattern reconstruction condition is met, carrying out well pattern reconstruction on the thin difference oil layer according to the set well pattern reconstruction scheme; otherwise, the well pattern reconstruction is not carried out on the thin and poor oil layer.
Preferably, the well pattern reconfiguration conditions are:
the sand body utilization degree of the thin difference oil layer with the thickness less than or equal to 0.5m is lower than the set sand body utilization degree, the oil-water well casing is determined to have no deformation or dislocation according to the operation construction summary, the casing inner diameter is greater than or equal to the set casing inner diameter, the oil-water well interval is between the set distances, and the oil-water well recovery rate is greater than or equal to the set oil-water well recovery rate.
Preferably, prior to determining the extent of sand mobilization, it is determined whether production horizons of each set of patterns intersect;
if no intersection exists, determining whether the sand bodies among the single wells are communicated according to the sand body deposition phase-diagram data; if the oil layer is communicated with the polymer flooding well pattern, calculating the thin oil difference layer with the thickness less than or equal to 0.5m and the sand body utilization degree of the polymer flooding well pattern; if not, not carrying out well pattern reconstruction on the thin and poor oil layer;
and if the thin and poor oil layer is crossed, not reconstructing the well pattern of the thin and poor oil layer.
Preferably, the method for determining the well pattern reconstruction scheme according to the total benefits of the schemes comprises the following steps:
and fitting the total benefits of the schemes into a curve by taking the schemes as an abscissa and the total benefits of the schemes as an ordinate, and determining an inflection point of the curve, wherein the scheme of the minimum distance between each scheme of the abscissa and an abscissa point in the inflection point is the well pattern reconstruction scheme.
Second, the present invention provides an apparatus for developing thin-difference reservoir well pattern reconstruction, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to invoke the memory-stored instructions to perform the method as described above.
The invention has at least the following beneficial effects:
the invention provides a method and a device for developing thin and poor oil layer well pattern reconstruction, which aim to solve the problems that the water-drive well pattern oil-water well ratio of a thin and poor oil layer is large, the sand body control degree is low, the injection and production well distance is reduced, the communication direction of well groups is reduced, the average single well oil increment is small, and the water content is large.
That is to say, the invention improves the development effect of the water-drive thin and poor oil layer, shortens the injection-production well spacing, and solves the problems that the tertiary oil recovery well pattern is idle after the injection-coalescence of the tertiary oil recovery well pattern is finished and the equipment is idle.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic flow diagram of a method of developing thin-differential reservoir well pattern reconstruction in accordance with an embodiment of the present invention;
FIG. 2 is a schematic illustration of a well pattern reconfiguration arrangement in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of a two-well pattern reconstruction scenario in accordance with an embodiment of the present invention;
FIG. 4 is a schematic illustration of a three well pattern reconstruction scenario in accordance with an embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the invention, features and advantages thereof, and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
FIG. 1 is a schematic flow chart of a method for developing thin-differential reservoir well pattern reconstruction according to an embodiment of the invention. As shown in fig. 1, a method of developing a thin-margin reservoir well pattern reconstruction includes: step 101, setting a well pattern reconstruction scheme for the thin-difference reservoir, wherein the well pattern reconstruction scheme at least comprises the following two schemes: in the scheme I, a polymer flooding injection well is used for water flooding well displacement, a polymer flooding extraction well is used for water flooding well displacement, a polymer flooding injection well is used for water flooding well displacement, and a polymer flooding extraction well is used for water flooding well displacement; step 102, respectively determining the total extraction degree of each scheme, and respectively determining the total benefit of each scheme according to the total extraction degree of each scheme and the total investment cost of each scheme; step 103, determining the well pattern reconstruction scheme according to the total benefits of all schemes; wherein the thickness of the thin oil difference layer is less than or equal to 0.5 m. The problems that the water-drive well pattern oil-water well ratio of a thin and poor oil layer is large, the sand control degree is low, the injection-production well spacing reduces the communication direction of well groups, the average single well oil increment is small, and the water content is large are solved.
In the invention and the embodiment, after the step 101 of setting the well pattern reconstruction scheme for the thin and poor oil layer is completed, the step 102 of determining the total extraction degree of each scheme for the reconstructed oil-water well is completed, and the total benefit of each scheme is determined according to the total extraction degree of each scheme and the total investment cost of each scheme; and completing step 103 to determine the well pattern reconstruction scheme according to the total benefit of each scheme.
In the invention and the embodiment, each scheme refers to three schemes or at least two schemes of a polymer flooding injection well for replacing a scheme-one water flooding well, a polymer flooding produced well for replacing a scheme-two water flooding well, a polymer flooding injection well for replacing a scheme-three water flooding well and a polymer flooding produced well for replacing a scheme-three water flooding well.
wherein, the method for respectively calculating the total extraction degree of each scheme is the same as that of the following steps: respectively determining the production degree of the water drive well of each scheme and the production degree of the polymer drive well of each scheme; and the total production degree of each scheme = the production degree of the water-drive well of each scheme + the production degree of the polymer-drive well of each scheme.
The method for determining the total benefit of each scheme according to the total extraction degree of each scheme and the total investment cost of each scheme is the same, wherein the total benefit of each scheme = the total investment cost of each scheme × of the total extraction degree of each scheme.
Based on the total production degree of each scheme = the water-drive well production degree of each scheme + the polymer-drive well production degree of each scheme, numerical simulation research needs to be performed on the three well pattern reconstruction schemes to determine the water-drive well production degree of each scheme and the polymer-drive well production degree of each scheme.
The formulas for respectively calculating the extraction degrees of the water flooding well and the polymer flooding well of the three well pattern reconstruction schemes are as follows: production level = cumulative oil production ÷ geological reserves. The following description is respectively given by determining the production degree of the water-drive well of each scheme and determining the production degree of the polymer-drive well of each scheme.
The production degree of the water-driving well of each scheme = accumulated oil production of the water-driving well of each scheme ÷ geological reserves of the water-driving well of each scheme.
And the polymer flooding well production degree of each scheme = accumulated oil production of the polymer flooding well of each scheme ÷ geological reserves of the polymer flooding well of each scheme.
The method for determining the production degree of the water-drive well in each scheme comprises the following steps: and respectively determining the accumulated oil production of the water-driving wells of the schemes and the geological reserves of the water-driving wells of the schemes, wherein the production degree of the water-driving wells of the schemes = the accumulated oil production of the water-driving wells of the schemes divided by the geological reserves of the water-driving wells of the schemes.
The method for determining the production degree of the polymer flooding well of each scheme comprises the following steps: and respectively determining the accumulated oil production of the polymer flooding well of each scheme and the geological reserves of the polymer flooding well of each scheme, wherein the production degree of the polymer flooding well of each scheme = the accumulated oil production of the polymer flooding well of each scheme divided by the geological reserves of the polymer flooding well of each scheme.
The method for determining the geological reserves of the water-drive wells of the schemes comprises the following steps: respectively establishing a water-drive well anatomical geological model of each scheme, and respectively obtaining the geological reserves of the water-drive wells of each scheme by using the water-drive well anatomical geological model of each scheme;
in the embodiment of the invention, an anatomical geological model is established by adopting Petrel geological modeling software for development horizon data, perforation data and well position data of single-well mining horizons of the oil-water well and the water-driven well after reconstruction of each scheme, and the geological reserves of the water-driven well of each scheme are obtained through the anatomical geological model.
The method for determining the geological reserves of the polymer flooding wells of each scheme comprises the following steps: and respectively establishing polymer flooding well anatomical geological models of all schemes, and respectively obtaining the geological reserves of the polymer flooding wells of all schemes by using the polymer flooding well anatomical geological models of all schemes.
In the embodiment of the invention, an anatomical geological model is established by adopting Petrel geological modeling software for development horizon data, perforation data and well position data of the single-well mining horizon of the oil-water well and the polymer flooding well after reconstruction of each scheme, and the geological reserves of the polymer flooding well of each scheme are obtained through the anatomical geological model.
The method for determining the accumulated oil production of the water-drive wells in each scheme comprises the following steps: respectively fitting the predicted well condition parameters of the single water drive well of each scheme by using the actual well condition parameters of the single water drive well of each scheme, respectively obtaining the fitting precision of each scheme according to the actual well condition parameters of the single water drive well of each scheme and the predicted well condition parameters of the single water drive well of each scheme, predicting the accumulated oil production of the water drive well of each scheme when the fitting precision of each scheme reaches the set fitting precision of the water drive well, keeping the water injection quantity of the single water drive well of each scheme unchanged, and determining the accumulated oil production of the water drive well of each scheme when the comprehensive water content reaches the set comprehensive water content of the water drive well; wherein, the fitting precision of the water drive well setting can be selected to be 85%, and the comprehensive water content of the water drive well setting can be selected to be 98%.
In the embodiment of the invention, the injection well history, the single-well production well history, the single-well measure horizon data and the injection and production profile of each water-flooding well of each scheme are respectively input into eclipse software to carry out water history fitting of each scheme, the predicted well condition parameters of the water-flooding well of each scheme are fitted by respectively utilizing the actual well condition parameters of the water-flooding well of each scheme, the fitting precision of each scheme is obtained according to the actual well condition parameters of the water-flooding well of each scheme and the predicted well condition parameters of the water-flooding well of each scheme, and the fitting precision of each scheme is ensured to be more than or equal to 85 percent of the set fitting precision of the water-flooding well
And after fitting, continuously predicting the accumulated oil production of the water-driven wells of all the schemes by using eclipss software, keeping the water injection rate of a single well of the water-driven well unchanged, and determining the accumulated oil production of the water-driven wells of all the schemes when the comprehensive water content in the eclipss software is 98% of the set comprehensive water content of the water-driven well.
Wherein, the actual well condition parameter of each water drive well individual well of each scheme includes: actual comprehensive water content, single-well liquid production amount, single-well oil production amount and total extraction degree; the predicted well condition parameter of each water-drive well single well of each scheme comprises the following steps: and (4) predicting comprehensive water content, single-well liquid production amount, single-well oil production amount and total extraction degree. Wherein the comprehensive water content is the water content of all wells needing well pattern reconstruction. The total production level is the production level of all wells requiring well pattern reconstruction.
The fitting accuracy = the number of data in which the predicted well condition parameters of the eclips software are overlapped with the actual well condition parameters input into the eclips software divided by the total number of the well condition parameter data. The predicted well condition parameters are predicted comprehensive water content, single-well liquid production amount, single-well oil production amount and total extraction degree, and the actual well condition parameters are actual comprehensive water content, single-well liquid production amount, single-well oil production amount and total extraction degree.
The method for determining the accumulated oil production of the polymer flooding well of each scheme comprises the following steps: respectively utilizing the actual well condition parameters of the polymer flooding well single well of each scheme to fit the predicted well condition parameters of the polymer flooding well single well of each scheme, respectively obtaining the fitting precision of each scheme according to the actual well condition parameters of the polymer flooding well single well of each scheme and the predicted well condition parameters of the polymer flooding well single well of each scheme, predicting the accumulated oil production of the polymer flooding well of each scheme when the fitting precision of each scheme reaches the set fitting precision of the polymer flooding well, keeping the water injection quantity of the single well of the polymer flooding well unchanged, and determining the accumulated oil production of the polymer flooding well of each scheme when the comprehensive water content reaches the set comprehensive water content of the polymer flooding well; the polymer flooding well setting fitting precision can be selected to be 85%, and the polymer flooding well setting comprehensive water content can be selected to be 98%.
In the embodiment of the invention, the injection well history, the oil production well history, the measure horizon data and the injection and production profile of the polymer flooding well single well of each scheme are respectively input into eclipse software to carry out polymer flooding history fitting of each scheme, the predicted well condition parameters of the polymer flooding well single well of each scheme are respectively fitted by utilizing the actual well condition parameters of the polymer flooding well single well of each scheme, the fitting precision of each scheme is obtained according to the actual well condition parameters of the polymer flooding well single well of each scheme and the predicted well condition parameters of the polymer flooding well single well of each scheme, and the fitting precision of each scheme is ensured to be more than or equal to 85 percent of the set fitting precision of the polymer flooding well
And after fitting, continuously predicting the accumulated oil production of the polymer flooding well of each scheme by using eclipss software, keeping the water injection rate of a single well of the polymer flooding well unchanged, and determining the accumulated oil production of the polymer flooding well of each scheme when the comprehensive water content in the eclipss software is 98% of the set comprehensive water content of the polymer flooding well.
Wherein, the actual well condition parameters of the polymer flooding well single well of each scheme comprise: actual comprehensive water content, single-well liquid production amount, single-well oil production amount and total extraction degree; the predicted well condition parameter of the polymer flooding well single well of each scheme comprises the following steps: and (4) predicting comprehensive water content, single-well liquid production amount, single-well oil production amount and total extraction degree. Wherein the comprehensive water content is the water content of all wells needing well pattern reconstruction. The total production level is the production level of all wells requiring well pattern reconstruction.
The fitting accuracy = the number of data in which the predicted well condition parameters of the eclips software are overlapped with the actual well condition parameters input into the eclips software divided by the total number of the well condition parameter data. The predicted well condition parameters are predicted comprehensive water content, single-well liquid production amount, single-well oil production amount and total extraction degree, and the actual well condition parameters are actual comprehensive water content, single-well liquid production amount, single-well oil production amount and total extraction degree.
It should be noted that in order to ensure consistency of the accumulated oil production of the water-driven wells of the schemes and the accumulated oil production of the water-driven wells of the schemes, the set fitting precision of the polymer flooding well is the same as that of the water-driven well, and the set comprehensive water content of the polymer flooding well is the same as that of the water-driven well.
In addition, step 102 determines the total extraction degree of each scheme respectively, and determines the total benefit of each scheme according to the total extraction degree of each scheme and the total investment cost of each scheme respectively:
the determination of the total production of each of the scenarios has been described in detail above, and the method for determining the total benefit of each scenario based on the total production of each scenario and the total investment cost of each scenario is the same, i.e. the total benefit of each scenario = the total investment cost of each scenario of the total production of each scenario ×.
Wherein, the total investment cost of each proposal at least comprises: well condition survey costs for each of the scenarios, overhaul costs for each of the scenarios, operating costs for each of the scenarios, hole patching costs for each of the scenarios, fracturing costs for each of the scenarios, and plugging costs for each of the scenarios. That is, the total investment cost of each project = the well condition survey cost of each project + the overhaul cost of each project + the operation cost of each project + the hole repair cost of each project + the fracturing cost of each project + the plugging cost of each project.
Wherein the well condition investigation cost of each scheme, the overhaul cost of each scheme, the operation cost of each scheme, the hole patching cost of each scheme, the fracturing cost of each scheme and the plugging cost of each scheme are the cost of one item in the total investment cost, the cost of one item is the unit price of × unit wells.
The unit price of an individual term of each recipe is related to the type of measure and the number of measure wells (the number of wells per term) required for each recipe.
The types of measures include: well condition investigation, hole patching, plugging, overhaul, operation and fracturing.
The method for determining the number of the measure wells comprises the following steps:
well condition investigation is needed for wells which are not overhauled or operated within ① 5 years;
② when the polymer flooding well in the same layer as the water drive water well has no perforation, making hole repair of the polymer flooding well;
③ substitute polymer flooding injection and production wells need to block the original polymer flooding mining horizon;
④ thin oil layer with thickness less than or equal to 0.5m in polymer flooding injection-production well, and permeability less than or equal to 0.05 μmm2Then, fracturing is carried out;
⑤ performing major repair when the polymer flooding injection and production well substituted by the polymer flooding injection and production well is subjected to major repair;
⑥ the polymer flooding production well is operated when the rod is broken and the pump is lost.
the method for determining the well pattern reconstruction scheme according to the total benefits of the schemes comprises the following steps: and fitting the total benefits of the schemes into a curve by taking the schemes as an abscissa and the total benefits of the schemes as an ordinate, and determining an inflection point of the curve, wherein the scheme of the minimum distance between each scheme of the abscissa and an abscissa point in the inflection point is the well pattern reconstruction scheme.
The total benefit of the three schemes is made into a curve, the abscissa is the scheme, the ordinate is the total benefit, and the scheme closest to the inflection point of the curve is the final optimal scheme. Specifically, the total benefit of each scheme is a point in a coordinate system, the total benefit of each scheme is fitted into the coordinate system to form a curve, so that an inflection point of the curve can be determined, the distance from an abscissa point of the inflection point to an abscissa point of the total benefit of each scheme is calculated respectively, and the scheme corresponding to the abscissa point of the total benefit with the smallest distance from the abscissa point of the inflection point is selected as the well pattern reconstruction scheme.
In the present invention, the method of developing the thin difference reservoir well pattern reconstruction is performed under conditions where the thin difference reservoir well pattern can be reconstructed. Therefore, before the well pattern reconstruction scheme is set for the thin and poor oil layer, whether the thin and poor oil layer meets the well pattern reconstruction condition is judged; if the well pattern reconstruction condition is met, carrying out well pattern reconstruction on the thin difference oil layer according to the set well pattern reconstruction scheme; otherwise, the well pattern reconstruction is not carried out on the thin and poor oil layer.
In the present invention, the well pattern reconstruction conditions are: the sand body utilization degree of the thin difference oil layer with the thickness less than or equal to 0.5m is lower than the set sand body utilization degree, the oil-water well casing is determined to have no deformation or dislocation according to the operation construction summary, the casing inner diameter is greater than or equal to the set casing inner diameter, the oil-water well interval is between the set distances, and the oil-water well recovery rate is greater than or equal to the set oil-water well recovery rate.
Wherein, the sand utilization degree can be set to 40%, the inner diameter of the casing can be set to 108mm, the set distance can be 100-150m, and the well opening rate of the oil-water well can be set to 70%.
In the invention, before determining the sand body utilization degree, whether the mining horizon of each set of well pattern is crossed or not needs to be determined; if no intersection exists, determining whether the sand bodies among the single wells are communicated according to the sand body deposition phase-diagram data; if the oil layer is communicated with the polymer flooding well pattern, calculating the thin oil difference layer with the thickness less than or equal to 0.5m and the sand body utilization degree of the polymer flooding well pattern; if not, not carrying out well pattern reconstruction on the thin and poor oil layer; and if the thin and poor oil layer is crossed, not reconstructing the well pattern of the thin and poor oil layer.
In an embodiment of the present invention, the mining horizon is first analyzed: carrying out well pattern investigation in an oil field area to be developed, wherein the well pattern comprises a water-drive basic well, a primary well pattern, a secondary well pattern, a tertiary well pattern and a polymer flooding well pattern; and (3) surveying the current production conditions, injection and production well patterns and injection and production well distances of various well pattern mining positions, water-drive basic wells, primary well patterns, secondary well patterns, tertiary well patterns and polymer flooding well patterns, and checking whether the mining positions of all sets of well patterns are crossed or not according to survey data. And if the thin and poor oil layer is crossed, not reconstructing the well pattern of the thin and poor oil layer.
Then, the sand body utilization degree is determined: and after determining that no intersection exists, calculating the sand body utilization degree of the polymer flooding well pattern and the thin oil layer with the thickness of less than or equal to 0.5m according to the data of single well perforation, single well liquid absorption profile, single well liquid production profile and sand body sedimentary facies belt pattern. Wherein, a single well is each well.
The sand body deposition phase-diagram data can be used for judging whether the sand bodies between the single wells are communicated or not, the sand body communication can be used for calculating the sand body utilization degree, and otherwise, the well pattern reconstruction is not carried out on the thin oil difference layer.
Sand mobilization degree = single well imbibition at production level or single well production thickness at production level ÷ development thickness at production level.
The single-well liquid absorption of the mining horizon or the single-well liquid production thickness of the mining horizon can be inquired according to the single-well liquid absorption profile data; and inquiring the development thickness according to the single well perforation data.
And finally, carrying out well network reconstruction feasibility analysis, wherein the utilization degree of sand bodies of a thin-difference oil layer with the thickness of ① being less than or equal to 0.5m is less than 40%, ② determines that the oil-water well casing has no deformation or dislocation according to the summary of operation and construction, the inner diameter of the casing is more than or equal to 108mm, the interval of ③ oil-water wells is between 100 and 150m, and the well rate of ④ oil-water wells is more than or equal to 70%.
Meanwhile, the invention also provides a device for developing thin difference oil reservoir well pattern reconstruction, which comprises the following components: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to invoke the memory-stored instructions to perform the method described above:
setting a well pattern reconstruction scheme aiming at the thin difference reservoir, wherein the well pattern reconstruction scheme at least comprises the following two schemes: in the scheme I, a polymer flooding injection well is used for water flooding well displacement, a polymer flooding extraction well is used for water flooding well displacement, a polymer flooding injection well is used for water flooding well displacement, and a polymer flooding extraction well is used for water flooding well displacement; respectively determining the total extraction degree of each scheme, and respectively determining the total benefit of each scheme according to the total extraction degree of each scheme and the total investment cost of each scheme; determining the well pattern reconstruction scheme according to the total benefits of the schemes; wherein the thickness of the thin oil difference layer is less than or equal to 0.5 m.
The methods provided by the disclosed embodiments may be implemented by computer-readable program instructions, which may be downloaded from a computer-readable storage medium to various computing/processing devices, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.
The computer program instructions for carrying out operations of the present disclosure may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry that can execute the computer-readable program instructions implements aspects of the present disclosure by utilizing the state information of the computer-readable program instructions to personalize the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA).
Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The thin and poor oil reservoir in the pure oil area of the Xinnang development area has high shale content, poor pore permeability and poor oil production. At present, the development still has more problems, is influenced by injection and production well spacing, and has lower communication proportion above three directions although the water drive control degree is higher. Moreover, the thickness of the oil layer is still relatively low, and the ratio of the thickness of the oil layer not used is still more than 30%. The water absorption capacity is greatly reduced and is difficult to recover by measures. At present, a thin oil layer is mainly weak and not washed by water, the oil phase permeability is reduced quickly, the water phase is difficult to lift, and the liquid production strength can be effectively improved by increasing fracturing modification.
Indoor experimental research results show that the limited injection-production well spacing of the reservoir outside the surface is not more than 250m, and in the view of the fine control fracturing effect in recent years, the thin-difference oil reservoir is still poor in mobility under the condition of the limited injection-production well spacing, and the thin-difference oil reservoir injection-production well spacing of the apricot and south is still large. How to effectively perfect the injection-production relationship, reduce the injection-production well spacing and improve the utilization degree of the thin-differential oil layer is the key of the thin-differential oil layer excavation. For the pure oil area in the Xingnan development area, after three times of encryption, the water drive reaches the ultimate well pattern, so the invention is utilized to reduce the research direction of the injection and production well distance of the thin and poor oil layer. By developing a water and polymer flooding well pattern reconstruction field test in the apricot thirteen regions and researching a thin difference oil layer utilization limit and a well pattern reconstruction method, the development effect of the water flooding thin difference oil layer is further improved.
By using the technical scheme of the invention, the test is carried out in the test area of the polymer flooding industrial mine field in the apricot thirteen areas. According to the method for finally determining the third scheme, 12 wells are investigated under well conditions, 7 wells are repaired, 6 wells are plugged, 3 wells are fractured, and 5 wells are finely adjusted. After the measures, water is injected, the average oil increase of a single well reaches 2.04t, the maximum water content is reduced by 6.1 percent, and the final input-output ratio reaches more than 1:4, so that the oil increasing and water reducing effects and the economic benefits are better.
FIG. 2 is a schematic illustration of a well pattern reconfiguration scheme in accordance with an embodiment of the present invention. As shown in FIG. 2, the 220m well spacing in the figure is the well spacing of the raw water flooding pattern, and the well circle with → is the substitute polymer flooding injection-production well. The post-surrogate injection-production well spacing is reduced to 106m and 150 m.
FIG. 3 is a schematic illustration of a two-well pattern reconstruction scenario in accordance with an embodiment of the present invention. As shown in FIG. 3, the 220m well spacing is the well spacing of the raw water flooding pattern, and the well circle with → is the substitute polymer flooding injection well. The injection-production well spacing after the replacement is not changed much and is 246 m.
FIG. 4 is a schematic illustration of a three well pattern reconstruction scenario in accordance with an embodiment of the present invention. As shown in FIG. 4, the 220m well spacing in the figure is the well pattern spacing of the raw water flooding well pattern, and the well circle with → is the substitute polymer flooding production well. The injection-production well spacing after the replacement is reduced to 106 m.
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, substitutions of equivalents, improvements and the like can be made without departing from the spirit of the invention, and these are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of developing a thin-margin reservoir well pattern reconstruction, comprising:
setting a well pattern reconstruction scheme aiming at the thin difference reservoir, wherein the well pattern reconstruction scheme at least comprises the following two schemes: in the scheme I, a polymer flooding injection well is used for water flooding well displacement, a polymer flooding extraction well is used for water flooding well displacement, a polymer flooding injection well is used for water flooding well displacement, and a polymer flooding extraction well is used for water flooding well displacement;
respectively determining the total extraction degree of each scheme, and respectively determining the total benefit of each scheme according to the total extraction degree of each scheme and the total investment cost of each scheme;
determining the well pattern reconstruction scheme according to the total benefits of the schemes;
wherein the thickness of the thin oil difference layer is less than or equal to 0.5 m.
2. The method of claim 1, wherein:
the method for respectively calculating the total extraction degree of each scheme is the same as that of the method for calculating the total extraction degree of each scheme, and comprises the following steps: respectively determining the production degree of the water drive well of each scheme and the production degree of the polymer drive well of each scheme;
the total production degree of each scheme = the production degree of the water drive well of each scheme + the production degree of the polymer drive well of each scheme;
and/or the presence of a gas in the interior of the container,
the method for determining the total benefit of each scheme according to the total extraction degree of each scheme and the total investment cost of each scheme is the same, wherein the total benefit of each scheme = the total investment cost of each scheme × of the total extraction degree of each scheme.
3. The method of claim 2, wherein:
the method for determining the production degree of the water-drive well in each scheme comprises the following steps: respectively determining the accumulated oil production of the water-driving wells of the schemes and the geological reserves of the water-driving wells of the schemes, wherein the production degree of the water-driving wells of the schemes = the accumulated oil production of the water-driving wells of the schemes divided by the geological reserves of the water-driving wells of the schemes;
the method for determining the production degree of the polymer flooding well of each scheme comprises the following steps: and respectively determining the accumulated oil production of the polymer flooding well of each scheme and the geological reserves of the polymer flooding well of each scheme, wherein the production degree of the polymer flooding well of each scheme = the accumulated oil production of the polymer flooding well of each scheme divided by the geological reserves of the polymer flooding well of each scheme.
4. The method of claim 3, wherein:
the method for determining the accumulated oil production of the water-drive wells in each scheme comprises the following steps: respectively fitting the predicted well condition parameters of the single water drive well of each scheme by using the actual well condition parameters of the single water drive well of each scheme, respectively obtaining the fitting precision of each scheme according to the actual well condition parameters of the single water drive well of each scheme and the predicted well condition parameters of the single water drive well of each scheme, predicting the accumulated oil production of the water drive well of each scheme when the fitting precision of each scheme reaches the set fitting precision of the water drive well, keeping the water injection quantity of the single water drive well of each scheme unchanged, and determining the accumulated oil production of the water drive well of each scheme when the comprehensive water content reaches the set comprehensive water content of the water drive well;
the method for determining the accumulated oil production of the polymer flooding well of each scheme comprises the following steps: respectively utilizing the actual well condition parameters of the polymer flooding well single well of each scheme to fit the predicted well condition parameters of the polymer flooding well single well of each scheme, respectively obtaining the fitting precision of each scheme according to the actual well condition parameters of the polymer flooding well single well of each scheme and the predicted well condition parameters of the polymer flooding well single well of each scheme, predicting the accumulated oil production of the polymer flooding well of each scheme when the fitting precision of each scheme reaches the set fitting precision of the polymer flooding well, keeping the water injection quantity of the single well of the polymer flooding well unchanged, and determining the accumulated oil production of the polymer flooding well of each scheme when the comprehensive water content reaches the set comprehensive water content of the polymer flooding well;
the method for determining the geological reserves of the water-drive wells of the schemes comprises the following steps: respectively establishing a water-drive well anatomical geological model of each scheme, and respectively obtaining the geological reserves of the water-drive wells of each scheme by using the water-drive well anatomical geological model of each scheme;
the method for determining the geological reserves of the polymer flooding wells of each scheme comprises the following steps: and respectively establishing polymer flooding well anatomical geological models of all schemes, and respectively obtaining the geological reserves of the polymer flooding wells of all schemes by using the polymer flooding well anatomical geological models of all schemes.
5. The method according to any one of claims 1 to 4, wherein the total investment costs for each scheme include at least: well condition survey costs for each of the scenarios, overhaul costs for each of the scenarios, operating costs for each of the scenarios, hole patching costs for each of the scenarios, fracturing costs for each of the scenarios, and plugging costs for each of the scenarios.
6. The method of any of claims 1-4, wherein prior to the setting of the well pattern reconstruction plan for the thin pay zone, determining whether the thin pay zone meets well pattern reconstruction conditions;
if the well pattern reconstruction condition is met, carrying out well pattern reconstruction on the thin difference oil layer according to the set well pattern reconstruction scheme; otherwise, the well pattern reconstruction is not carried out on the thin and poor oil layer.
7. The method of claim 6, wherein the well pattern reconstruction condition is:
the sand body utilization degree of the thin difference oil layer with the thickness less than or equal to 0.5m is lower than the set sand body utilization degree, the oil-water well casing is determined to have no deformation or dislocation according to the operation construction summary, the casing inner diameter is greater than or equal to the set casing inner diameter, the oil-water well interval is between the set distances, and the oil-water well recovery rate is greater than or equal to the set oil-water well recovery rate.
8. The method of claim 7, wherein prior to determining the extent of sand mobilization, determining whether production horizons of each set of well patterns intersect;
if no intersection exists, determining whether the sand bodies among the single wells are communicated according to the sand body deposition phase-diagram data; if the oil layer is communicated with the polymer flooding well pattern, calculating the thin oil difference layer with the thickness less than or equal to 0.5m and the sand body utilization degree of the polymer flooding well pattern; if not, not carrying out well pattern reconstruction on the thin and poor oil layer;
and if the thin and poor oil layer is crossed, not reconstructing the well pattern of the thin and poor oil layer.
9. The method of any of claims 1-4, 7-8, wherein the method of determining the well pattern reconstruction scenario from the total benefit of the scenarios is:
and fitting the total benefits of the schemes into a curve by taking the schemes as an abscissa and the total benefits of the schemes as an ordinate, and determining an inflection point of the curve, wherein the scheme of the minimum distance between each scheme of the abscissa and an abscissa point in the inflection point is the well pattern reconstruction scheme.
10. An apparatus for developing a thin-differential reservoir well pattern reconstruction, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to invoke the memory-stored instructions to perform the method of any of claims 1 to 9.
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