Method, device and equipment for determining number of holes of flow-limiting screen pipe and storage medium

Abstract

The invention discloses a method, device and equipment for determining the number of holes of a flow-limiting screen pipe and a storage medium. The method comprises the steps that the expected total yield and the toe end pressure of a horizontal section after a target horizontal oil well is acidified and put into production are determined; the target horizontal oil well is divided into n sections, and the expected oil production of each section of sub horizontal oil well is determined according to the expected total yield; for each sub-horizontal oil well in the n sub-horizontal oil wells, determining a first bottom hole flowing pressure of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well and the toe end pressure of the horizontal section; according to the first well bottom flowing pressure, the hole number of a flow limiting screen pipe placed in the sub horizontal oil well is determined; wherein the length of the flow-limiting screen pipe is the same as that of the sub horizontal oil well. According to the technical scheme provided by the embodiment of the invention, the number of the holes of the flow-limiting screen pipe placed in the sub-horizontal oil well is designed through the expected total yield and the toe end pressure of the horizontal section, so that a balanced production profile after acidification production can be realized.

Description

Technical Field

[0001] The invention relates to the field of petroleum and natural gas, and in particular to a method, a device, equipment and a storage medium for determining the number of holes of a flow-limiting screen pipe. Background Art

[0002] At present, the industry has formed a design method for flow-limiting screen completion and acidizing, which mainly achieves uniform acid injection in each section during the acidizing process so that all parts of the horizontal well section receive the same degree of etching.

[0003] However, when the oil production of a horizontal well is high (for example, greater than 10,000 barrels per day), due to the flow friction of crude oil in the horizontal section, different production pressure differences will be formed in the horizontal section, resulting in different production profiles in the horizontal section: low production at the toe end and gradually increasing toward the heel end. For example, Figure 1 A horizontal section production profile before and after acidification treatment in the prior art is shown.

[0004] Unbalanced production profiles often lead to the inrush of bottom water, edge water or injected water, causing premature water breakthrough in the oil well, which not only affects production but also brings more challenges to the production management of the oil well. Summary of the invention

[0005] The present invention provides a method, device, equipment and storage medium for determining the number of holes of a flow-limiting screen pipe. The number of holes of the flow-limiting screen pipe placed in a sub-horizontal oil well is designed according to the expected total production and the toe pressure of the horizontal section, so as to achieve a balanced production profile after acidizing and production.

[0006] According to one aspect of the present invention, a method for determining the number of holes of a flow-limiting screen is provided, the method comprising:

[0007] Determine the expected total production and horizontal section toe pressure of the target horizontal oil well after acidizing and production;

[0008] Divide the target horizontal oil well into N sections, and determine the expected oil production of each section of the horizontal oil well according to the expected total production;

[0009] For each of the N sections of sub-horizontal oil wells, determine a first bottom hole flowing pressure of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well and the toe pressure of the horizontal section;

[0010] The number of holes of the flow-limiting screen placed in the sub-horizontal oil well is determined according to the first bottom hole flow pressure; wherein the length of the flow-limiting screen is the same as the length of the sub-horizontal oil well.

[0011] According to another aspect of the present invention, a device for determining the number of holes of a flow-limiting screen is provided, the device comprising:

[0012] The expected total production determination module is used to determine the expected total production and horizontal section toe pressure of the target horizontal oil well after acidizing and production;

[0013] An expected oil production determination module is used to divide the target horizontal oil well into N sections, and determine the expected oil production of each section of the horizontal oil well according to the expected total production;

[0014] A first bottom hole flow pressure determination module is used to determine, for each sub-horizontal oil well in the N sub-horizontal oil wells, a first bottom hole flow pressure of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well and the toe pressure of the horizontal section;

[0015] The hole number determination module is used to determine the number of holes of the flow-limiting screen placed in the sub-horizontal oil well according to the first bottom hole flow pressure; wherein the length of the flow-limiting screen is the same as the length of the sub-horizontal oil well.

[0016] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0017] at least one processor; and

[0018] a memory communicatively connected to the at least one processor; wherein,

[0019] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the number of holes of the flow-limiting screen according to any embodiment of the present invention.

[0020] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the number of holes of a flow-limiting screen according to any embodiment of the present invention when executed.

[0021] The technical solution of the embodiment of the present invention determines the expected total production and horizontal section toe pressure of the target horizontal oil well after acidizing and production; divides the target horizontal oil well into N sections, and determines the expected oil production of each section of sub-horizontal oil wells according to the expected total production; for each section of the N sections of sub-horizontal oil wells, determines the first bottom hole flow pressure of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well and the horizontal section toe pressure; determines the number of holes of the flow limiting screen placed in the sub-horizontal oil well according to the first bottom hole flow pressure; wherein the length of the flow limiting screen is the same as the length of the sub-horizontal oil well. The technical solution of the embodiment of the present invention designs the number of holes of the flow limiting screen placed in the sub-horizontal oil well according to the expected total production and the horizontal section toe pressure, so as to achieve a balanced production profile after acidizing and production.

[0022] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a horizontal section output profile diagram before and after acidification treatment in the prior art;

[0025] Figure 2 is a flow chart of a method for determining the number of holes of a flow-limiting screen provided in accordance with Embodiment 1 of the present invention;

[0026] Figure 3 It is a schematic diagram of horizontal segmentation and wellbore flow provided according to the first embodiment of the present invention;

[0027] Figure 4 Flow chart of a method for determining the number of holes of a flow-limiting screen according to Embodiment 2 of the present invention

[0028] Figure 5 2 is a schematic structural diagram of a device for determining the number of holes of a flow-limiting screen pipe according to a third embodiment of the present invention;

[0029] Figure 6 It is a structural schematic diagram of an electronic device for implementing a method for determining the number of holes of a flow-limiting screen tube according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Embodiment 1

[0033] Figure 2 A flowchart of a method for determining the number of holes of a flow-limiting screen is provided for the first embodiment of the present invention. This embodiment is applicable to the case of determining the number of holes of a flow-limiting screen. The method can be performed by a device for determining the number of holes of a flow-limiting screen. The device for determining the number of holes of a flow-limiting screen can be implemented in the form of hardware and / or software. The device for determining the number of holes of a flow-limiting screen can be configured in an electronic device. Figure 2 As shown, the method includes:

[0034] S110. Determine the expected total production and horizontal section toe pressure of the target horizontal oil well after acidizing and production.

[0035] Among them, oil well acidizing treatment is an oil field production-increasing technology that injects acidic liquid into the horizontal section and utilizes the chemical reaction between the acidic liquid and reactive minerals in the formation to dissolve the connected pores or natural fracture wall rocks in the reservoir, thereby improving the permeability and production capacity of the well section.

[0036] Among them, the horizontal section toe pressure refers to the pressure at the end of the horizontal section, that is, the pressure at the farthest point of the horizontal section relative to the wellhead, which can be used to evaluate the dynamic characteristics of the reservoir, such as reservoir permeability, reservoir flow law and production capacity.

[0037] In the embodiment of the present invention, the expected total production and horizontal section toe pressure after the target horizontal oil well is acidified and put into production can be determined according to the development and production allocation requirements or the oil well production capacity. Among them, the development and production allocation requirements are usually based on the development plan and economic budget of the oil well, and the oil well production capacity needs to be evaluated by various exploration methods and comprehensive consideration of various oil well parameters.

[0038] S120, dividing the target horizontal oil well into N sections, and determining the expected oil production of each section of the horizontal oil well according to the expected total production.

[0039] In an embodiment of the present invention, the target horizontal oil well can be evenly divided into N sections according to the length of the target horizontal oil well, and the expected total production of the oil well can be evenly distributed to each section to determine the expected oil production of each section of the sub-horizontal oil well. Alternatively, the target horizontal oil well can be divided into N sections according to the actual conditions of the oil well, such as geological characteristics, lithology changes, etc., and the length of each section of the sub-horizontal oil well is calculated. In combination with the expected total production and the total length of the target horizontal oil well, the capacity allocation ratio is determined, and the expected oil production of each section of the sub-horizontal oil well is further determined.

[0040] For example, Figure 3 A schematic diagram of horizontal segmentation and wellbore flow is shown, such as Figure 3 As shown, the horizontal section is evenly divided into N sections of horizontal oil wells, wherein the right side of the first section of the horizontal oil well is the toe of the horizontal section. The acid flows toward the toe of the horizontal section, and the flow direction of the crude oil is opposite to that of the acid.

[0041] S130 . For each of the N sections of sub-horizontal oil wells, determine a first bottom hole flowing pressure of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well and the toe pressure of the horizontal section.

[0042] Among them, bottom hole flowing pressure refers to the bottom hole pressure measured during oil well production, which represents the back pressure generated by the residual pressure at the wellhead and the weight of the liquid column in the wellbore on the bottom of the well.

[0043] In the embodiment of the present invention, after the expected oil production of each sub-horizontal oil well is determined according to the expected total production, the first bottom hole flowing pressure of the sub-horizontal oil well can be determined in combination with the horizontal segment toe pressure determined in step S110.

[0044] S140. Determine the number of holes of a flow-limiting screen placed in the sub-horizontal oil well according to the first bottom hole flow pressure; wherein the length of the flow-limiting screen is the same as the length of the sub-horizontal oil well.

[0045] Among them, the flow-limiting screen is a device used in the oil well production process, generally made of metal materials, with certain pressure resistance and corrosion resistance. The flow-limiting screen is usually installed at the bottom of the oil well casing or tubing. Its main functions include limiting flow, controlling pressure difference and preventing blowout.

[0046] In the embodiment of the present invention, the number of holes of the flow-limiting screen placed in the sub-horizontal oil well can be determined according to the first bottom hole flow pressure. The flow-limiting screen with the determined number of holes is placed in the sub-horizontal oil well, and acidizing and production operations are performed according to the established construction procedures to obtain a relatively balanced production profile. It should be noted that when placing the flow-limiting screen, the length of the flow-limiting screen should be ensured to be the same as the length of the sub-horizontal oil well.

[0047] The technical solution of the embodiment of the present invention determines the expected total production and horizontal section toe pressure of the target horizontal oil well after acidizing and production; divides the target horizontal oil well into N sections, and determines the expected oil production of each section of sub-horizontal oil wells according to the expected total production; for each section of the N sections of sub-horizontal oil wells, determines the first bottom hole flow pressure of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well and the horizontal section toe pressure; determines the number of holes of the flow limiting screen placed in the sub-horizontal oil well according to the first bottom hole flow pressure; wherein the length of the flow limiting screen is the same as the length of the sub-horizontal oil well. The technical solution of the embodiment of the present invention designs the number of holes of the flow limiting screen placed in the sub-horizontal oil well according to the expected total production and the horizontal section toe pressure, so as to achieve a balanced production profile after acidizing and production.

[0048] Embodiment 2

[0049] Figure 4 This is a flow chart of a method for determining the number of holes of a flow-limiting screen provided in the second embodiment of the present invention. The embodiment of the present invention is optimized based on the above embodiment. For solutions not described in detail in the embodiment of the present invention, please refer to the above embodiment. Figure 4 As shown, the method includes:

[0050] S210. Determine the expected total production and horizontal section toe pressure of the target horizontal oil well after acidizing and production.

[0051] For example, the horizontal section of a well is 10,000 feet long, the wellbore radius is 6 inches, and the basic parameters of the well are shown in Table 1.

[0052] Table 1 Basic parameters of a well reservoir and wellbore

[0053] Parameter information Numeric unit L 10000 ft h 150 ft <![CDATA[k H ]]> 350 md <![CDATA[k V ]]> 25 md <![CDATA[r w ]]> 0.5 ft <![CDATA[2y b ]]> 3000 ft <![CDATA[y0]]> 1500 ft <![CDATA[z0]]> 75 ft <![CDATA[p e ]]> 2700 psia <![CDATA[p wf ]]> 2600 psia <![CDATA[μ0]]> 8 cp <![CDATA[B0]]> 1 <![CDATA[ρ o ]]> 65.5 <![CDATA[lbm / ft 3 ]]> ε 0.0006 D 4 in Q 10000 STB / d

[0054] The planned production of the well is 10,000 barrels per day. The expected total production of the well and the toe pressure of the horizontal section after acidizing and production can be determined based on the development production requirements.

[0055] S220, dividing the target horizontal oil well into N sections, and determining the expected oil production of each section of the sub-horizontal oil well according to the expected total production.

[0056] For example, N=10 can be taken, so that the well is divided into 10 sections on average, and the expected total production of the oil well is evenly distributed to each section to obtain the expected oil production of each section.

[0057] S230: Determine the flow friction of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well.

[0058] Flow friction refers to the resistance encountered by liquid or gas when flowing in a pipe or medium, and is used to describe the energy loss when the liquid flows. Flow friction generally depends on factors such as fluid properties, fluid velocity, pipe size and shape, and pipe wall surface conditions.

[0059] Specifically, the flow friction of the sub-horizontal oil well is determined according to the expected oil production of the sub-horizontal oil well, including: determining the well flow rate of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well; wherein the well flow rate is the sum of the expected oil production of each section of sub-horizontal oil well before the sub-horizontal oil well and half of the expected oil production of the sub-horizontal oil well; the flow friction of the sub-horizontal oil well is determined according to the well flow rate.

[0060] In the embodiment of the present invention, before determining the flow friction of the sub-horizontal oil well, the well flow rate of the sub-horizontal oil well needs to be determined first. Specifically, the well flow rate of the current sub-horizontal oil well can be obtained by adding the sum of the expected oil production of each section of sub-horizontal oil wells before the current sub-horizontal oil well to half of the expected oil production of the current sub-horizontal oil well. Afterwards, the flow friction of the sub-horizontal oil well can be determined according to the well flow rate of the sub-horizontal oil well.

[0061] Specifically, the flow friction of the sub-horizontal oil well is determined according to the flow rate in the well, including:

[0062] The flow friction of the sub-horizontal oil well is determined according to the following formula:

[0063]

[0064]

[0065]

[0066] Among them, △P wfp represents the flow friction, q represents the flow rate in the sub-horizontal oil well, l represents the length of the sub-horizontal oil well, f represents the friction coefficient, ρ o represents the crude oil density, D represents the inner diameter of the sub-horizontal oil well, ε represents the relative roughness of the pipe wall of the sub-horizontal oil well, Re represents the pipe flow Reynolds number, μ o Indicates the viscosity of crude oil.

[0067] For example, after determining the in-well flow rate of a sub-horizontal oil well of a certain well, the flow friction of the well can be calculated according to the above formula and the basic parameter values ​​in Table 1 above. The specific calculation results are shown in Table 2 below.

[0068] S240. Determine the first bottom hole flow pressure of the sub-horizontal oil well according to the flow friction and the horizontal section toe pressure; wherein the first bottom hole flow pressure is the difference between the horizontal section toe pressure and the flow friction of the corresponding sub-horizontal oil well.

[0069] In the embodiment of the present invention, after the flow friction of the sub-horizontal oil well is determined, the first bottom hole flow pressure of the sub-horizontal oil well can be determined according to the flow friction and the horizontal section toe pressure. Specifically, the first bottom hole flow pressure of the sub-horizontal oil well can be obtained by subtracting the flow friction of the sub-horizontal oil well from the horizontal section toe pressure.

[0070] For example, the first bottom hole flow pressure of a well can be calculated based on the toe pressure of the horizontal section of the well and the flow friction of the sub-horizontal oil well. The specific calculation results are shown in Table 2 below.

[0071] S250. Calculate the expected skin coefficient of the sub-horizontal oil well after acidizing according to the first bottom hole flowing pressure of the sub-horizontal oil well.

[0072] The skin coefficient is a parameter that describes the seepage characteristics of oil wells and represents the additional resistance between the reservoir and the wellbore. The value of the skin coefficient can be positive or negative. A positive value is used to represent the obstruction of the reservoir to the flow of fluids, while a negative value is used to represent the enhancement of the reservoir to the flow of fluids.

[0073] Specifically, according to the first bottom hole flowing pressure of the sub-horizontal oil well, the expected skin factor of the sub-horizontal oil well after acidizing is calculated, including:

[0074] The expected skin factor of the sub-horizontal oil well after acidizing is calculated according to the following formula:

[0075]

[0076] Where s is the expected skin factor, q in represents the expected oil production of the sub-horizontal oil well, k represents the average permeability of the reservoir, L represents the length of the target horizontal oil well, P e Reservoir pressure, P wfp represents the first bottom hole flowing pressure of the sub-horizontal oil well, B0 represents the crude oil system coefficient, r w represents the diameter of the sub-horizontal oil well, h represents the thickness of the oil layer, I an represents the reservoir anisotropy coefficient, y b Expressed as half the reservoir width.

[0077] For example, after determining the first bottom hole flow pressure of a sub-horizontal oil well of a certain well, the expected skin coefficient of the well can be calculated according to the above formula and the basic parameter values ​​in Table 1 above. The specific calculation results are shown in Table 2.

[0078] Table 2 Flow friction, first bottom hole flow pressure and expected skin coefficient of a well

[0079]

[0080]

[0081] S260. Calculate the expected acid-etched wormhole length of the sub-horizontal oil well according to the expected skin coefficient, and calculate the expected acid injection amount of the sub-horizontal oil well according to the expected acid-etched wormhole length.

[0082] Among them, acid wormholes refer to the channels or holes formed by acid corrosion of the reservoir during the acidizing treatment of oil wells. The formation of acid wormholes plays an important role in increasing the seepage channels between the reservoir and the wellbore and improving the production capacity of oil wells.

[0083] Specifically, based on the expected skin factor, the expected acid-etched wormhole length of the sub-horizontal oil well is calculated, including:

[0084] The expected length of the acid-etched wormhole in the sub-horizontal oil well is calculated according to the following formula:

[0085] -s

[0086] r wh =r w e;

[0087] The expected acid injection volume of the sub-horizontal oil well is calculated based on the expected acid wormhole length, including:

[0088] The expected acid injection volume of the sub-horizontal oil well is calculated according to the following formula:

[0089]

[0090] Among them, r w Represents the diameter of the sub-horizontal oil well, r wh represents the expected acid-etched wormhole length, s represents the expected skin factor, COV represents the expected acid inflow, φ represents the porosity, and PV represents the expected acid inflow. bt Indicates the PV number of acid penetrating the core.

[0091] It should be noted that when calculating the expected acid-etched wormhole length of a sub-horizontal oil well, the sub-horizontal oil well with a positive expected skin coefficient needs to be processed so that its expected skin coefficient is 0.

[0092] For example, after a sub-horizontal oil well with a positive expected skin coefficient is processed and its expected skin coefficient is set to 0, the expected acid-etched wormhole length and the expected acid injection volume of the sub-horizontal oil well are calculated using the above formula and the flow-limiting screen completion and acidizing parameters in Table 3. The specific calculation results are shown in Table 4 below.

[0093] Table 3: Flow-limiting screen completion and acidizing parameters for a well

[0094] S270, determining the horizontal section end pressure of the target horizontal oil well after acidizing and production.

[0095] The horizontal section end pressure refers to the pressure of the closest point of the horizontal section relative to the wellhead, which can reflect the initial pressure and pressure attenuation of the reservoir, the relationship between the wellbore and the reservoir, etc. In the embodiment of the present invention, the horizontal section end pressure after the target horizontal oil well is acidified and put into production can be determined according to the development and production allocation requirements or the oil well production capacity.

[0096] S280. Determine the second bottom hole flow pressure of the sub-horizontal oil well according to the flow friction and the horizontal section bottom end pressure; wherein the second bottom hole flow pressure is the difference between the horizontal section bottom end pressure and the flow friction of the corresponding sub-horizontal oil well.

[0097] In the embodiment of the present invention, after the flow friction of the sub-horizontal oil well is determined, the second bottom hole flow pressure of the sub-horizontal oil well can be determined according to the flow friction and the horizontal section bottom end pressure. Specifically, the second bottom hole flow pressure of the sub-horizontal oil well can be obtained by subtracting the flow friction of the sub-horizontal oil well from the horizontal section bottom end pressure.

[0098] S290. Determine the number of holes of the flow-limiting screen placed in the sub-horizontal oil well according to the expected acid inflow amount.

[0099] Specifically, the number of holes of the flow-limiting screen placed in the sub-horizontal oil well is determined according to the expected acid inflow, including:

[0100] The number of holes of the flow-restricting screen placed in the sub-horizontal oil well is determined according to the following formula:

[0101]

[0102]

[0103] Where n is the number of holes, COV is the expected acid injection volume, l is the length of the sub-horizontal oil well, C D Indicates the hole flow coefficient, D hole Indicates the inner diameter of the hole, P wfa represents the second bottom hole flowing pressure, P e represents reservoir pressure, ρ a represents the density of acid liquid, t inj Indicates the acidification construction time, Q a Indicates the acid wellhead injection rate, COV i represents the expected acid injection volume of the ith sub-horizontal oil well, and N represents the total number of sub-horizontal oil wells.

[0104] For example, after the expected acid injection rate of a well is determined, the number of holes of the flow-limiting screen of the sub-horizontal oil well can be determined according to the expected acid injection rate and the parameters in Table 1 and Table 3. The specific results are shown in Table 4.

[0105] Table 4 Acidizing operation parameter calculation and flow limiting screen hole number table for a well

[0106]

[0107] It can be seen from Table 4 that the number of holes of the flow-limiting screen pipes in each section from the toe end to the heel end of the horizontal section are 50, 37, 23, 10, 3, 1, 0, 0, 0, 0. After the flow-limiting screen pipes are installed according to the hole distribution, the well is put into production according to the production allocation of 10,000 barrels / day, and a relatively balanced production profile can be obtained.

[0108] The technical solution of the embodiment of the present invention determines the expected total production and horizontal section toe pressure of the target horizontal oil well after acidizing and production; divides the target horizontal oil well into N sections, and determines the expected oil production of each sub-horizontal oil well according to the expected total production; determines the flow friction of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well; determines the first bottom hole flow pressure of the sub-horizontal oil well according to the flow friction and the horizontal section toe pressure; wherein the first bottom hole flow pressure is the difference between the horizontal section toe pressure and the flow friction of the corresponding sub-horizontal oil well; according to the first bottom hole flow pressure of the sub-horizontal oil well , calculate the expected skin coefficient after acidizing of the sub-horizontal oil well; calculate the expected acid wormhole length of the sub-horizontal oil well according to the expected skin coefficient, and calculate the expected acid injection amount of the sub-horizontal oil well according to the expected acid wormhole length; determine the horizontal section heel pressure after the target horizontal oil well is put into production after acidizing; determine the second bottom hole flow pressure of the sub-horizontal oil well according to the flow friction and the horizontal section heel pressure; wherein the second bottom hole flow pressure is the difference between the horizontal section heel pressure and the corresponding flow friction of the sub-horizontal oil well; determine the number of holes of the flow-limiting screen placed in the sub-horizontal oil well according to the expected acid injection amount. The technical solution of the embodiment of the present invention designs the number of holes of the flow-limiting screen placed in the sub-horizontal oil well according to the expected total production and the horizontal section toe pressure, so as to achieve a balanced production profile after acidizing is put into production.

[0109] Embodiment 3

[0110] Figure 5 This is a schematic diagram of the structure of a device for determining the number of holes of a flow-limiting screen provided in Embodiment 3 of the present invention. Figure 5 As shown, the device comprises:

[0111] The expected total production determination module 310 is used to determine the expected total production and horizontal section toe pressure of the target horizontal oil well after acidizing and production;

[0112] An expected oil production determination module 320 is used to divide the target horizontal oil well into N sections, and determine the expected oil production of each section of the sub-horizontal oil well according to the expected total production;

[0113] A first bottom hole flowing pressure determining module 330 is used to determine, for each sub-horizontal oil well in the N sub-horizontal oil wells, a first bottom hole flowing pressure of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well and the toe pressure of the horizontal section;

[0114] The hole number determination module 340 is used to determine the number of holes of the flow limiting screen placed in the sub-horizontal oil well according to the first bottom hole flow pressure; wherein the length of the flow limiting screen is the same as the length of the sub-horizontal oil well.

[0115] Optionally, the first bottom hole flowing pressure determination module 330 includes:

[0116] A flow friction determination unit, used to determine the flow friction of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well;

[0117] The first bottom hole flow pressure determination unit is used to determine the first bottom hole flow pressure of the sub-horizontal oil well according to the flow friction and the horizontal section toe pressure; wherein the first bottom hole flow pressure is the difference between the horizontal section toe pressure and the corresponding flow friction of the sub-horizontal oil well.

[0118] Optionally, the flow friction determination unit comprises:

[0119] A well flow determination subunit, used to determine the well flow of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well; wherein the well flow is the sum of the expected oil production of each section of sub-horizontal oil wells before the sub-horizontal oil well and half of the expected oil production of the sub-horizontal oil well;

[0120] The flow friction determination subunit is used to determine the flow friction of the sub-horizontal oil well according to the flow rate in the well.

[0121] Optionally, the flow friction determination subunit is specifically used for:

[0122] The flow friction of the sub-horizontal oil well is determined according to the following formula:

[0123]

[0124]

[0125]

[0126] Among them, △P wfp represents the flow friction, q represents the flow rate in the sub-horizontal oil well, l represents the length of the sub-horizontal oil well, f represents the friction coefficient, ρ orepresents the crude oil density, D represents the inner diameter of the wellbore of the sub-horizontal oil well, ε represents the relative roughness of the pipe wall of the sub-horizontal oil well, Re represents the pipe flow Reynolds number, μ o Indicates the viscosity of crude oil.

[0127] Optionally, the hole number determination module 340 includes:

[0128] an expected skin coefficient determination unit, used for calculating the expected skin coefficient of the sub-horizontal oil well after acidizing according to the first bottom hole flowing pressure of the sub-horizontal oil well;

[0129] An expected acid-etched wormhole length determination unit, used to calculate the expected acid-etched wormhole length of the sub-horizontal oil well according to the expected skin coefficient;

[0130] An expected acid injection amount determination unit, used for calculating the expected acid injection amount of the sub-horizontal oil well according to the expected acid-etched wormhole length;

[0131] The hole number determination unit is used to determine the number of holes of the flow-limiting screen placed in the sub-horizontal oil well according to the expected acid injection amount.

[0132] Optionally, the expected skin coefficient determination unit is specifically used to:

[0133] The expected skin factor of the sub-horizontal oil well after acidizing is calculated according to the following formula:

[0134]

[0135] Where s is the expected skin factor, q in represents the expected oil production of the sub-horizontal oil well, k represents the average permeability of the reservoir, L represents the length of the target horizontal oil well, P e Reservoir pressure, P wfp represents the first bottom hole flow pressure of the sub-horizontal oil well, B0 represents the crude oil system coefficient, r w represents the diameter of the sub-horizontal oil well, h represents the oil layer thickness, I an represents the reservoir anisotropy coefficient, y b Expressed as half the reservoir width.

[0136] Optionally, the expected acid-etched wormhole length determination unit is specifically used for:

[0137] The expected acid-etched wormhole length of the sub-horizontal oil well is calculated according to the following formula:

[0138] -s

[0139] r wh =r w e;

[0140] The expected acid inlet amount determination unit is specifically used for:

[0141] The expected acid injection volume of the sub-horizontal oil well is calculated according to the following formula:

[0142]

[0143] Among them, r w represents the diameter of the sub-horizontal oil well, r wh represents the expected acid-etched wormhole length, s represents the expected skin factor, COV represents the expected acid inflow, φ represents the porosity, and PV represents the expected acid inflow. bt Indicates the PV number of acid penetrating the core.

[0144] Optionally, the hole number determination module 340 further includes:

[0145] A horizontal section bottom end pressure determination unit, used to determine the horizontal section bottom end pressure of the target horizontal oil well after acidification and production;

[0146] A second bottom hole flow pressure determination unit is used to determine the second bottom hole flow pressure of the sub-horizontal oil well according to the flow friction and the horizontal section bottom end pressure; wherein the second bottom hole flow pressure is the difference between the horizontal section bottom end pressure and the corresponding flow friction of the sub-horizontal oil well;

[0147] The hole number determination unit is specifically used for:

[0148] The number of holes of the flow-restricting screen placed in the sub-horizontal oil well is determined according to the following formula:

[0149]

[0150]

[0151] Where n represents the number of holes, COV represents the expected acid injection volume, l represents the length of the sub-horizontal oil well, C D Indicates the hole flow coefficient, D hole Indicates the inner diameter of the hole, P wfa represents the second bottom hole flowing pressure, P e represents reservoir pressure, ρ a represents the density of acid liquid, t inj Indicates the acidification construction time, Q a Indicates the acid wellhead injection rate, COV i represents the expected acid injection volume of the ith sub-horizontal oil well, and N represents the total number of sub-horizontal oil wells.

[0152] The device for determining the number of holes of a flow-limiting screen provided in an embodiment of the present invention can execute the method for determining the number of holes of a flow-limiting screen provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0153] Embodiment 4

[0154] Figure 6 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0155] like Figure 6 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0156] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0157] The processor 11 may be a variety of general and / or dedicated processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a method for determining the number of holes of a flow-restricting screen.

[0158] In some embodiments, the method for determining the number of holes of the flow-restricting screen may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for determining the number of holes of the flow-restricting screen described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the method for determining the number of holes of the flow-restricting screen in any other appropriate manner (e.g., by means of firmware).

[0159] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0160] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0161] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0162] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0163] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0164] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0165] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0166] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for determining the number of holes of a flow-limiting screen, characterized in that: include: Determine the expected total production and horizontal section toe pressure of the target horizontal oil well after acidizing and production; Divide the target horizontal oil well into N sections, and determine the expected oil production of each section of the horizontal oil well according to the expected total production; For each of the N sections of sub-horizontal oil wells, determine a first bottom hole flowing pressure of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well and the toe pressure of the horizontal section; The number of holes of the flow-limiting screen placed in the sub-horizontal oil well is determined according to the first bottom hole flow pressure; wherein the length of the flow-limiting screen is the same as the length of the sub-horizontal oil well.

2. The method according to claim 1, characterized in that Determining a first bottom hole flow pressure of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well and the toe pressure of the horizontal section includes: Determining the flow friction of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well; The first bottom hole flow pressure of the sub-horizontal oil well is determined according to the flow friction and the horizontal section toe pressure; wherein the first bottom hole flow pressure is the difference between the horizontal section toe pressure and the corresponding flow friction of the sub-horizontal oil well.

3. The method according to claim 2, characterized in that Determining the flow friction of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well includes: Determine the well flow rate of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well; wherein the well flow rate is the sum of the expected oil production of each section of sub-horizontal oil wells before the sub-horizontal oil well and half of the expected oil production of the sub-horizontal oil well; The flow friction of the sub-horizontal oil well is determined according to the flow rate in the well.

4. The method according to claim 3, characterized in that Determining the flow friction of the sub-horizontal oil well according to the flow rate in the well includes: The flow friction of the sub-horizontal oil well is determined according to the following formula: Among them, △P wfp represents the flow friction, q represents the flow rate in the sub-horizontal oil well, l represents the length of the sub-horizontal oil well, f represents the friction coefficient, ρ o represents the crude oil density, D represents the inner diameter of the wellbore of the sub-horizontal oil well, ε represents the relative roughness of the pipe wall of the sub-horizontal oil well, Re represents the pipe flow Reynolds number, μ o Indicates the viscosity of crude oil.

5. The method according to claim 1, characterized in that Determining the number of holes of a flow-limiting screen placed in the sub-horizontal oil well according to the first bottom hole flow pressure includes: Calculating an expected skin factor of the sub-horizontal oil well after acidizing according to a first bottom hole flowing pressure of the sub-horizontal oil well; Calculating the expected acid-etched wormhole length of the sub-horizontal oil well according to the expected skin coefficient; Calculating the expected acid injection volume of the sub-horizontal oil well according to the expected acid-etched wormhole length; The number of holes of the flow-limiting screen placed in the sub-horizontal oil well is determined according to the expected acid inflow amount.

6. The method according to claim 5, characterized in that Calculating the expected skin factor of the sub-horizontal oil well after acidizing according to the first bottom hole flowing pressure of the sub-horizontal oil well includes: The expected skin factor of the sub-horizontal oil well after acidizing is calculated according to the following formula: Where s is the expected skin factor, q in represents the expected oil production of the sub-horizontal oil well, k represents the average permeability of the reservoir, L represents the length of the target horizontal oil well, P e Reservoir pressure, P wfp represents the first bottom hole flow pressure of the sub-horizontal oil well, B0 represents the crude oil system coefficient, r w represents the diameter of the sub-horizontal oil well, h represents the oil layer thickness, I an represents the reservoir anisotropy coefficient, y b Expressed as half the reservoir width.

7. The method according to claim 5, characterized in that Calculating the expected acid-etched wormhole length of the sub-horizontal oil well according to the expected skin factor includes: The expected acid-etched wormhole length of the sub-horizontal oil well is calculated according to the following formula: -s r wh ＝r w e； Calculating the expected acid injection amount of the sub-horizontal oil well according to the expected acid-etched wormhole length includes: The expected acid injection volume of the sub-horizontal oil well is calculated according to the following formula: Among them, r w represents the diameter of the sub-horizontal oil well, r wh represents the expected acid-etched wormhole length, s represents the expected skin factor, COV represents the expected acid inflow, φ represents the porosity, and PV represents the expected acid inflow. bt Indicates the PV number of acid penetrating the core.

8. The method according to claim 5, characterized in that Before determining the number of holes of the flow-limiting screen placed in the sub-horizontal oil well according to the expected acid inflow, the method further includes: Determine the horizontal section bottom end pressure of the target horizontal oil well after acidizing and production; Determine the second bottom hole flow pressure of the sub-horizontal oil well according to the flow friction and the horizontal section bottom end pressure; wherein the second bottom hole flow pressure is the difference between the horizontal section bottom end pressure and the corresponding flow friction of the sub-horizontal oil well; Determining the number of holes of the flow-limiting screen placed in the sub-horizontal oil well according to the expected acid inflow volume includes: The number of holes of the flow-limiting screen placed in the sub-horizontal oil well is determined according to the following formula: Where n represents the number of holes, COV represents the expected acid injection volume, l represents the length of the sub-horizontal oil well, C D Indicates the hole flow coefficient, D hole Indicates the inner diameter of the hole, P wfa represents the second bottom hole flowing pressure, P e represents reservoir pressure, ρ a represents the density of acid liquid, t inj Indicates the acidification construction time, Q a Indicates the acid wellhead injection rate, COV i represents the expected acid injection volume of the ith sub-horizontal oil well, and N represents the total number of sub-horizontal oil wells.

9. A device for determining the number of holes of a flow-limiting screen pipe, characterized in that: include: The expected total production determination module is used to determine the expected total production and horizontal section toe pressure of the target horizontal oil well after acidizing and production; An expected oil production determination module is used to divide the target horizontal oil well into N sections, and determine the expected oil production of each section of the horizontal oil well according to the expected total production; A first bottom hole flow pressure determination module is used to determine, for each sub-horizontal oil well in the N sub-horizontal oil wells, a first bottom hole flow pressure of the sub-horizontal oil well according to the expected oil production of the sub-horizontal oil well and the toe pressure of the horizontal section; The hole number determination module is used to determine the number of holes of the flow-limiting screen placed in the sub-horizontal oil well according to the first bottom hole flow pressure; wherein the length of the flow-limiting screen is the same as the length of the sub-horizontal oil well.

10. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the number of holes of a flow-restricting screen according to any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the number of holes of a flow-restricting screen according to any one of claims 1 to 8 when the computer instructions are executed.

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