CN216342059U - Well completion structure for synchronous and balanced exploitation of multi-layer oil reservoir - Google Patents
Well completion structure for synchronous and balanced exploitation of multi-layer oil reservoir Download PDFInfo
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Abstract
A well completion structure for synchronous and balanced exploitation of a multilayer oil reservoir comprises a central pipe column arranged in a shaft, wherein a continuous packer formed by filling packing particles is arranged in an annular space between the central pipe column and the wall of the shaft; the central pipe column comprises a plurality of flow control sections and communication sections which are arranged at intervals, the positions and the lengths of the flow control sections correspond to the oil layer positions of the shaft, and the positions and the lengths of the communication sections correspond to the positions of the low-permeability/non-permeability stratum and/or the water outlet stratum of the shaft. According to the well completion structure and the production method for synchronous and balanced exploitation of the multi-layer oil reservoir, the independent liquid production amount of each oil layer and the reference flow rate of each flow control filter are reasonably distributed, so that simultaneous production and consistent promotion of oil-water boundaries of a plurality of oil layers under different production pressure equal-difference conditions can be realized, and exploitation of the plurality of oil layers can be finally completed at the same time.
Description
Technical Field
The utility model belongs to the technical field of oil exploitation, relates to a well completion structure, and particularly relates to a well completion structure for synchronous and balanced exploitation of a multi-layer oil reservoir.
Background
A multi-layer reservoir generally refers to a reservoir formed by alternating vertically distributed layers of oil (e.g., sandstone, conglomerate, or carbonate reservoirs) and low permeability/impermeable formations (e.g., mudstone), pay-out formations. Because different oil layers have interlayer differences in the aspects of water absorption capacity, water line propulsion speed, oil layer pressure, oil extraction speed, extraction degree, flooding and the like, synchronous balanced extraction of all the oil layers cannot be realized simultaneously when a vertical well or a directional well is adopted to extract a multi-layer oil reservoir. Specifically, if a plurality of oil layers are mined simultaneously, because of multi-aspect interlayer differences of each oil layer, the oil layer mining speed is different, and the oil-water boundary of the oil layer is different. Once a certain oil layer sees water in advance, because the seepage velocity of water far exceeds that of oil, under the same production pressure difference, a large amount of water is produced from the formation and enters a central tubular column, so that the water content in produced fluid is increased; meanwhile, a large amount of formation water enters the central pipe column, and the production pressure difference of other oil layers is reduced, so that the oil production is reduced. In the article of multi-layer oil reservoir balanced exploitation influencing factor analysis (author: Huangaixian, broken oil and gas field, No. 22, No. 1, 1 month in 2015), the author analyzes relevant factors influencing balanced exploitation, but a specific scheme for realizing synchronous balanced exploitation of oil reservoirs is not provided.
In order to solve the problems of different oil layer parameters and unbalance in the mining process, two asynchronous mining modes are adopted in the prior art, one mode is to open a plurality of layers at the lowest part of an oil well for mining and then return step by step; the other is by the stratified mining technique. For the layered mining technology, all oil reservoirs are generally divided into 4 large sections for mining, and each large section still has a plurality of small layers, so that independent mining of each small layer cannot be realized. Completion for a multi-reservoir well is generally: and (5) casing and cementing after drilling, and perforating corresponding to the production layer needing to be opened. If a separate-layer production mode is adopted, a packer and a sliding sleeve assembly are usually required to be put into a perforated casing, all production layers are divided into a plurality of sections (generally not more than 4 sections), then large-section production is carried out, a switch of the sliding sleeve on a packer pipe column is used for opening certain large sections to put into production, and after a period of production, other large sections needing to be opened are adjusted to carry out production. If the multi-layer oil deposit is a loose sandstone stratum, gravel packing needs to be carried out in a casing after perforation, or segmented gravel packing operation needs to be carried out, or gravel packing needs to be carried out for multiple times, and when the length of a gravel packing construction segment exceeds 100 meters, the well completion process is very complicated.
For a multi-layer oil deposit, the existing well completion structure and the existing production method have the following defects: (1) due to the restriction of interlayer difference of different oil layers, synchronous and balanced exploitation of multiple oil layers cannot be realized; (2) by adopting the existing layered mining mode, the multiple small layers in one production section cannot realize layered independent mining, and the problem of synchronous and balanced mining cannot be solved; if one layer of effluent water flows out, the yield of the whole production section is influenced, and the overall recovery ratio of the oil well is low; if a step-by-step upward return mining mode is adopted, the oil well is slow in mining speed, and a plurality of small layers opened each time can only be integrally mined, so that the problems still exist; (3) for a perforated well, the seepage area is limited due to the limitation of the density of the perforated holes, so that blockage is easily formed and the yield of the oil well is influenced; (4) the effective separation effect of the packer between production sections is short, and when the difference between layers, particularly the pressure difference is large, the effective working life of the packer is shorter; (5) if the cement sheath has a channeling phenomenon, the packer cannot realize packing; (6) for the way of perforating after well cementation, multi-section or even multi-time gravel filling is required for the unconsolidated sandstone reservoir, and a sectional production string is required to be put into the gravel filling string during sectional production, so that the operation time is long, and the well completion cost is high; (7) the existing two exploitation modes have complex well completion structure, large difficulty in later-stage well repair, large risk and high cost; (8) for loose sandstone, when the mud content is higher, the problems of mud blockage and reduction of the liquid production index of an oil well also occur.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a well completion structure for synchronous and balanced production of a multi-layer oil reservoir.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a well completion structure for synchronous and balanced exploitation of a multilayer oil reservoir comprises a central pipe column arranged in a shaft, wherein a continuous packer formed by filling packing particles is arranged in an annular space between the central pipe column and the wall of the shaft; the central pipe column comprises a plurality of flow control sections and communication sections which are arranged at intervals, the positions and the lengths of the flow control sections correspond to the oil layer positions of the shaft, and the positions and the lengths of the communication sections correspond to the positions of the low-permeability/non-permeability stratum and/or the water outlet stratum of the shaft.
Furthermore, the flow control section is a flow control filter or a flow control filter pipe string formed by connecting a plurality of flow control filters in series; wherein the content of the first and second substances,
for any ith oil layer, if the thickness L of the oil layeriLess than or equal to the standard length L of a flow control filter0If the flow control section is a flow control filter, the number of the flow control filters of the flow control section is: m isi＝1；
If the thickness L of the oil layeriGreater than a standard length L of flow control filter0The flow control section is a flow control filter pipe string formed by connecting a plurality of flow control filters in series, and the number of the flow control filters is as follows:
maximum production pressure difference in the oil layerΔPiUnder the conditions, the reference flow rate of the flow control filter is as follows: v. ofi＝ Qi/mi；
Wherein i is the number of oil layers, i is 1,2, …, N is the total number of oil layers corresponding to the well bore, and Q is the total number of oil layers corresponding to the well boreiThe distributed fluid production for the ith reservoir,
indicating rounding up.
Further, the maximum production pressure difference Δ P for any ith reservoiriComprises the following steps:
for independently producing wells, Δ Pi＝Pdi-Pwfi，
For wells with water injection wells, Δ Pi＝Pzi-Pwfi；
Wherein, PdiFormation pressure of i-th reservoir, PziWater injection pressure, P, of the water injection well corresponding to the ith oil layer to the oil layerwfiIs the minimum bottom hole flow pressure for the reservoir.
Further, for any ith oil layer, if the thickness L of the oil layeriLess than a standard length L of a flow control filter0If the oil layer is not the flow control filter with the standard length, the flow control filter with the length the same as or consistent with the thickness of the oil layer is adopted; or a flow control filter with the length slightly exceeding the thickness of the oil layer is adopted, wherein the exceeding length is within 0.5 meter.
Further, for any ith oil layer, if the thickness L of the oil layeriGreater than the standard length of a flow control filter and not an integer multiple of the standard length, the flow control filters are connected in series to form a flow control filter string, wherein the length of an individual flow control filter is equal to LdOr with LdThe consistency is achieved; wherein the content of the first and second substances,
further, the length of the independent one flow control filter is larger than LdAnd is less than (L)d+0.5) meters.
Furthermore, the communication section is a communication pipe joint or a communication pipe joint pipe string formed by connecting a plurality of communication pipe joints in series.
Furthermore, a toe end flow control filter is arranged at the toe end of the central pipe column, and the reference flow rate of the toe end flow control filter is not lower than that of the oil layer or the flow control filter closest to the oil layer.
Furthermore, a porous sleeve is arranged in the shaft, and the central pipe column is arranged in the porous sleeve.
According to the well completion structure for synchronous and balanced exploitation of the multi-layer oil reservoir, the independent liquid production amount of each oil layer and the reference flow rate of each flow control filter are reasonably distributed, so that simultaneous production and consistent promotion of an oil-water boundary of a plurality of oil layers under different production pressure difference conditions can be realized, and the simultaneous exploitation of the plurality of oil layers is finally guaranteed.
Drawings
FIG. 1 is a schematic diagram of a well completion configuration for simultaneous balanced production of a multi-zone reservoir according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a well completion configuration for simultaneous balanced production of a plurality of reservoirs in accordance with the present invention;
FIG. 3 is a schematic flow chart of a production method for synchronous balanced exploitation of a multi-layer oil reservoir according to an embodiment of the present invention.
Description of reference numerals: 1-wellbore, 2-center string, 21-flow control section, 22-communication section, 3-continuous packer, 4-porous casing, 51-packer, 52-top packer, 53-hanging packer, 6-oil layer, 7-low permeability/non-permeability stratum and/or water outlet stratum.
Detailed Description
The following further describes a specific embodiment of the well completion structure for synchronous and balanced production of a multi-layer oil reservoir according to the present invention with reference to the accompanying drawings 1 to 3. The well completion structure for simultaneous and balanced production of a multi-zone reservoir according to the present invention is not limited to the description of the following embodiments.
The meanings of the symbols and terms used herein are explained first as follows:
q: the fluid production is designed, i.e. the maximum expected fluid production of the well obtained by logging.
N: total number of oil layers.
Li: and the thickness of the ith oil layer along the extension direction of the well bore, wherein i is the serial number of the oil layer, and i is 1,2, … and N.
L: total thickness of oil layer, L ═ L1+L2+…+LN。
Qi: ith zone distributes production volume, Qi＝Q·LiAnd L. According to the distributed liquid production amount, the multiple oil layers can be exploited in a balanced manner, namely the oil-water interfaces of the oil layers can be promoted in a balanced and consistent manner, and the problems that the pressure difference of other oil layers is reduced and the water content in the total liquid production is increased due to the fact that a certain oil layer is exposed to water first are avoided.
Pdi: for independently producing wells, the formation pressure of the ith reservoir.
Pzi: and for an oil well provided with a water injection well, the water injection pressure corresponding to the ith oil layer.
Pwfi: minimum bottom hole flow pressure.
ΔPi: maximum production pressure differential for the ith reservoir. For independently producing wells, Δ Pi＝Pdi-Pwfi(ii) a For wells with water injection wells, Δ Pi＝Pzi-Pwfi。
L0: standard length of flow control filter.
vi: reference flow rate, v, of flow-control filteri＝Qi/mi。
A flow control filter: a filter string with regulation capability for flow through, including regulation from maximum demand to minimum demand, even complete shut-off. The flow control filter types include, but are not limited to, ICD, AICD, ICV, and the like; specific structures include, but are not limited to: slotted screen pipe, wire-wound screen pipe, precise micropore composite screen pipe, precise punched slotted screen pipe, slotted liner pipe and the like.
Communicating pipe joints: the pipe columns are connected in series in the central pipe column and only play a role in connection and communication.
Continuous packing and separating body: packing particles are filled with a packing fluid in an annulus between the flow control filter and the wellbore wall, the packing particles are stacked to form a continuous packing body, and micropores between the packing particles form flow-through channels for fluid, and the fluid can penetrate through the micropores in the continuous packing body along the radial direction of the wellbore, but the speed of the penetration along the axial direction of the wellbore is greatly limited. The continuous packer water control technology has the advantages of simple and fast operation, good water control effect and the like, and is increasingly widely applied. For example, chinese patents 2009102507912, 2009102507927, 2016109769579, 2016212003861, 201910623000X, 2019104892759, etc., all disclose the specific application of the technology in oil and gas well production.
Synchronous and balanced mining: under different production pressure difference conditions, a plurality of oil layers are produced simultaneously, and oil-water boundary lines are pushed in a consistent manner, so that the oil layers are finally mined simultaneously.
Example 1:
the embodiment provides a well completion structure for synchronous and balanced production of a multilayer oil reservoir, as shown in fig. 1, comprising a central pipe string 2 arranged in a shaft 1, wherein the central pipe string 2 is sealed off from the wall of the shaft 1 by a packer 51, and a continuous packer 3 formed by filling packing particles is arranged in an annular space between the central pipe string 2 and the wall of the shaft 1. The central pipe column 2 comprises a plurality of flow control sections 21 and communication sections 22 which are arranged at intervals, the positions and the lengths of the flow control sections 21 correspond to the positions of an oil layer 6 of the shaft, and the positions and the lengths of the communication sections 22 correspond to the positions of a low-permeability/non-permeability stratum and/or a water outlet stratum 7 of the shaft. The "position corresponds" means that the length of the flow control section 21 is greater than the length of the oil reservoir of the wellbore, for example, the range of the length of the flow control section 21 greater than the length of the oil reservoir of the wellbore is within 0.5 meter.
The present embodiment also provides another well completion configuration for simultaneous balanced production of a multi-zone reservoir, as shown in FIG. 2. The difference from the completion structure shown in fig. 1 is that a porous casing 4 is also arranged in the wellbore 1, the central string 2 is arranged inside the porous casing 4, the central string is sealed off from the porous casing 4 by a top packer 52, and the porous casing 4 is sealed off from the wall of the wellbore 1 by a hanging packer 53. The porous casing 4 is provided in order that the porous casing 4 facilitates the formation of the wellbore for wellbores having an insufficiently stable wall structure. The porous casing is arranged to prevent the filling failure caused by blockage caused by the collapse of the well wall in the filling process; on the other hand, after the oil well is put into operation for several years, if the central pipe column needs to be taken out, packing particles in the annular space between the central pipe column and the porous casing 4 can be returned, so that the phenomenon of well wall collapse cannot occur, and the central pipe column 2 is ensured to be taken out smoothly. Therefore, the technical scheme provided by the embodiment is not only suitable for the open hole well, but also suitable for the cased well with the casing, the perforated well and the like.
In order to realize synchronous and balanced exploitation of a plurality of oil layers, the flow of each flow control section needs to be adjusted, and the oil-water boundary of all the oil layers is ensured to be synchronously pushed towards the direction of a shaft. Specifically, in this embodiment, a flow control filter having a flow control function is adopted as a main structure of the flow control section, and the flow control section is a flow control filter or a flow control filter pipe string formed by connecting a plurality of flow control filters in series. Assume that the wellbore includes N oil zones numbered, i ═ 1,2, …, N, respectively. For any ith oil layer, if the thickness L of the oil layeriLess than or equal to the standard length L of a flow control filter0If the flow control section is a flow control filter, the number of the flow control filters of the flow control section is: m isi1. If the thickness of the oil layer is larger than the standard length of one flow control filter, the flow control section is a flow control filter pipe string formed by connecting a plurality of flow control filters in series, and the number of the flow control filters is as follows:
standard length L of said flow control filter0Without specific limitation, the length of each is 5 m, for example, depending on the product model of different manufacturers.
Maximum production pressure difference Δ P in the oil layeriReference of said flow-control filter under conditionsThe flow rate is: v. ofi＝ Qi/mi. The reference flow rate herein refers to a flow rate under the condition of the same fluid viscosity or viscosity as the oil layer; in order to simplify the calculation, or under the condition that detailed data of the viscosity of the production fluid of each stratum is not available, the average viscosity of the production fluid of the shaft can be used for replacing, or the average viscosity of the production fluid of the adjacent shaft can be used for replacing. Even if the estimation of the viscosity parameter of the produced fluid has certain deviation, the standard flow rate of the flow control filter adopted by each layer of oil layer is increased or reduced in equal proportion, each layer of oil layer can still be exploited according to the preset oil layer distribution produced fluid roughly, and the balance propulsion of the oil-water boundary cannot be greatly influenced. Of course, when calculating and setting the reference flow rate of the flow control filter, parameters such as the oil-water ratio and viscosity of the produced fluid, the permeability of the oil layer medium and the like can be further considered, so that the set reference flow rate is more accurate. Wherein i is the number of oil layers, i is 1,2, …, N is the total number of oil layers corresponding to the well bore, and Q is the total number of oil layers corresponding to the well boreiThe distributed fluid production for the ith reservoir,
indicating rounding up. The reference flow rate of the flow control filter is related to the diameter of the pipe column, the shape of the flow passage, the area of the flow passage and the like, and the flow control filters with different specifications usually have different reference flow rate parameters which are usually measured and labeled in the product design or production link. The purpose of adopting upward rounding is to ensure that the length of the flow control section is slightly longer than the thickness of an oil layer, and the excessive part extends to the impermeable stratum without influencing the real liquid production of the oil layer.
Maximum production pressure differential Δ P for any ith reservoiriIt can be determined by the following method:
(1) for independently producing wells, Δ Pi＝Pdi-PwfiThe oil well for independent production does not adopt an injection production mode and is not provided with a water injection well;
(2) for wells with water injection wells, Δ Pi＝Pzi-Pwfi。
Wherein, PdiFormation pressure of i-th reservoir, PziWater injection pressure, P, of the water injection well corresponding to the ith oil layer to the oil layerwfiIs the minimum bottom hole flow pressure for the reservoir.
Preferably, in order to make the length of accuse section of flowing more match with the thickness of oil reservoir to realize more accurate control to the liquid production volume of this oil reservoir, to arbitrary ith oil reservoir, if the thickness L of this oil reservoiriLess than a standard length L of a flow control filter0Then the oil layer does not use the standard length flow control filter, but uses other types of flow control filters with the same or consistent length with the thickness of the oil layer. For example, a standard flow control filter length of 5 meters and a formation thickness of 2.8 meters, a flow control filter length of 2.8 meters or 3 meters may be used. The "consistent lengths" are preferably close to each other, and are not required to be identical, and usually the difference is acceptable within 0.5 m. Preferably, in order to better realize the exploitation of the oil reservoir, the length of the flow control filter pipe string should be slightly greater than the thickness of the oil reservoir, and the excess length can be set within 0.5 meter.
For any ith oil layer, if the thickness of the oil layer is greater than the standard length of one flow control filter and is not an integral multiple of the standard length, the flow control filter strings formed by connecting a plurality of flow control filters in series, wherein the length of an independent flow control filter is equal to LdOr with LdThe consistency is achieved; wherein the content of the first and second substances,
for example, a standard length of 5 meters for a flow control filter and a formation thickness of 22.1 meters, 4 flow control filters of 5 meters in length and 1 filter of 2.1 or 2 meters in length may be used. The consistent length also means that the lengths are relatively close. Preferably, in particular implementations, the length of the separate one of the flow control filters is set to be greater than LdAnd is less than (L)d+0.5) meters, to ensure whatThe total length of the flow control filter tube string is slightly larger than the thickness of the stratum and is not more than 0.5 m.
The communication section is a communication pipe section or a communication pipe section pipe string formed by connecting a plurality of communication pipe sections in series. For the impermeable stratum, the effect of preventing the produced liquid from streaming in the shaft can be better achieved by arranging the communicating short joints and arranging the continuous packer in the shaft at the corresponding position. For the water-yielding stratum, the communicating short joints are arranged and the continuous sealing bodies are arranged in the mineshafts at the corresponding positions, so that the corresponding water-yielding stratum can be sealed, the water content of produced liquid is reduced, and the production efficiency is improved.
Preferably, because the flow back of the packing fluid is relatively weak at the deepest portion of the well bore, i.e., at the toe end of the center string, it is desirable to increase the flow back of the packing fluid at this location, again to enhance the packing effect of the packing particles at that location. To this end, the toe end of the central column is provided with a toe end flow control filter which differs from other flow control filters in that the flow control filters differ in their reference flow rates, specifically: when the stratum corresponding to the toe end is an oil layer, the reference flow rate of the toe end flow control filter is not lower than that of the flow control filter of the oil layer; and when the stratum corresponding to the toe end is an impermeable stratum, the reference flow rate of the toe end flow control filter is not lower than that of the flow control filter which is closest to the oil layer.
Example 2:
the embodiment provides a production method for synchronous balanced exploitation of a multi-layer oil reservoir, which adopts the well completion structure for synchronous balanced exploitation of the multi-layer oil reservoir as described above, and as shown in fig. 3, the production method comprises the following steps:
establishing a well completion structure for synchronous and balanced exploitation of the multi-layer oil reservoir;
after the production, all oil layers are synchronously and evenly exploited.
This embodiment has the same technical effects as embodiment 1.
Example 3:
this example shows a specific application of the technical solutions disclosed in the above examples 1 and 2 to a certain oil reservoir.
A certain carbonate reservoir has 40 oil layers and a plurality of oil-water systems in total along the direction of a shaft, and the interlayer difference is large. In order to realize synchronous balanced production, after the directional well production section is drilled and completed, a 5.5-inch central pipe column is directly put into an 8.5-inch open hole well, and then the annular space between the central pipe column and the well wall is filled with 40-70 mesh packing particles. According to technical parameters such as the designed liquid production amount of a shaft, the thickness of the oil layer to be drilled and encountered in each oil layer, the formation pressure corresponding to each oil layer, the minimum bottom hole flowing pressure and the like, the number and the reference flow rate of the flow control filter of each oil layer are calculated and obtained, and the specific model of the flow control filter is determined (taking the flow control filter produced by Andon Berlin oil science and technology Co., Ltd as an example). The specific parameters are as follows:
example 4:
this example shows a specific application of the technical solutions disclosed in the above examples 1 and 2 to a certain oil reservoir.
In a certain loose sandstone oil reservoir, 20 oil layers are shared along the direction of a shaft, and the difference between layers is large. In order to realize synchronous balanced production, after the directional well production section is drilled and completed, a 7-inch porous casing is put into an open hole well with the length of 8.5 inches, then a 4-inch central pipe column is put into the porous casing, and finally 70-100 meshes of packer particles are filled in the annular spaces between the central pipe column and the porous casing and between the porous casing and the well wall. According to technical parameters such as the designed liquid production amount of a shaft, the thickness of an oil layer to be drilled and encountered in each oil layer, the injection pressure of a water injection well, the minimum bottom hole flowing pressure of each oil layer and the like, the number and the reference flow rate of flow control filters of each oil layer are calculated and obtained, and the specific model of the flow control filter is determined (taking the flow control filter produced by Andon Berlin oil technology Co., Ltd as an example). The specific parameters are as follows:
the foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.
Claims (9)
1. A well completion structure for synchronous and balanced exploitation of a multilayer oil reservoir comprises a central pipe column arranged in a shaft, wherein a continuous packer formed by filling packing particles is arranged in an annular space between the central pipe column and the shaft wall of the shaft, and the well completion structure is characterized in that:
the central pipe column comprises a plurality of flow control sections and communication sections which are arranged at intervals, the positions and the lengths of the flow control sections correspond to the oil layer positions of the shaft, and the positions and the lengths of the communication sections correspond to the positions of the low-permeability/non-permeability stratum and/or the water outlet stratum of the shaft.
2. The completion structure for synchronous balanced production of a multi-zone reservoir according to claim 1, wherein: the flow control section is a flow control filter or a flow control filter pipe string formed by connecting a plurality of flow control filters in series; wherein the content of the first and second substances,
for any ith oil layer, if the thickness L of the oil layeriLess than or equal to the standard length i of a flow control filter0If the flow control section is a flow control filter, the number of the flow control filters of the flow control section is: m isi＝1；
If the thickness L of the oil layeriGreater than a standard length L of flow control filter0The flow control section is a flow control filter pipe string formed by connecting a plurality of flow control filters in series, and the number of the flow control filters is as follows:
maximum production pressure difference Δ P in the oil layeriUnder the conditions, the reference flow rate of the flow control filter is as follows: v. ofi＝Qi/mi；
Wherein i is the number of oil layers, i is 1,2, …, N is the total number of oil layers corresponding to the well bore, and Q is the total number of oil layers corresponding to the well boreiThe distributed fluid production for the ith reservoir,
indicating rounding up.
3. The completion structure for synchronous balanced production of a multi-zone reservoir according to claim 2, wherein: maximum production pressure differential Δ P for any ith reservoiriComprises the following steps:
for independently producing wells, Δ Pi＝Pdi-Pwfi，
For wells with water injection wells, Δ Pi＝Pzi-Pwfi；
Wherein, PdiFormation pressure of i-th reservoir, PziWater injection pressure, P, of the water injection well corresponding to the ith oil layer to the oil layerwfiIs the minimum bottom hole flow pressure for the reservoir.
4. The completion structure for synchronous balanced production of a multi-zone reservoir according to claim 2, wherein: for any ith oil layer, if the thickness L of the oil layeriLess than a standard length L of a flow control filter0If the oil layer is not the flow control filter with the standard length, the flow control filter with the length the same as or consistent with the thickness of the oil layer is adopted; or a flow control filter with the length slightly exceeding the thickness of the oil layer is adopted, wherein the exceeding length is within 0.5 meter.
5. The completion structure for synchronous balanced production of a multi-zone reservoir according to claim 2, wherein: for any ith oil layer, if the thickness L of the oil layeriGreater than the standard length of a flow control filter and not an integer multiple of the standard length, the flow control filters are connected in series to form a flow control filter string, wherein the length of an individual flow control filter is equal to LdOr with LdThe consistency is achieved; wherein the content of the first and second substances,
6. the completion structure for synchronous balanced production of a multi-zone reservoir according to claim 5, wherein: the length of the independent one flow control filter is greater than LdAnd is less than (L)d+0.5) meters.
7. The completion structure for synchronous balanced production of a multi-zone reservoir according to claim 1, wherein: the communication section is a communication pipe section or a communication pipe section pipe string formed by connecting a plurality of communication pipe sections in series.
8. The completion structure for synchronous balanced production of a multi-zone reservoir according to claim 1, wherein: the toe end of the central pipe column is provided with a toe end flow control filter, and the reference flow rate of the toe end flow control filter is not lower than that of the oil layer or the flow control filter closest to the oil layer.
9. The completion structure for synchronous balanced production of a multi-zone reservoir according to claim 1, wherein: a perforated casing is further arranged in the shaft, and the central pipe column is arranged inside the perforated casing.
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