WO2024207828A1 - 模拟计算多层合采煤层气井产量的方法与系统 - Google Patents

模拟计算多层合采煤层气井产量的方法与系统 Download PDF

Info

Publication number
WO2024207828A1
WO2024207828A1 PCT/CN2023/142093 CN2023142093W WO2024207828A1 WO 2024207828 A1 WO2024207828 A1 WO 2024207828A1 CN 2023142093 W CN2023142093 W CN 2023142093W WO 2024207828 A1 WO2024207828 A1 WO 2024207828A1
Authority
WO
WIPO (PCT)
Prior art keywords
well
production
virtual
layer
coal seam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/142093
Other languages
English (en)
French (fr)
Inventor
刘玲莉
黄文松
卫晓怡
苏朋辉
王建俊
崔泽宏
段利江
李铭
杨勇
曲良超
孔祥文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Petrochina Co Ltd
Original Assignee
Petrochina Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Petrochina Co Ltd filed Critical Petrochina Co Ltd
Priority to AU2023442355A priority Critical patent/AU2023442355A1/en
Publication of WO2024207828A1 publication Critical patent/WO2024207828A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/10—Numerical modelling
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Definitions

  • the present invention relates to the technical field of coalbed methane wells, and in particular to a method for simulating and calculating the production of a multi-layer commingled coalbed methane well and a system for simulating and calculating the production of a multi-layer commingled coalbed methane well.
  • the purpose of the embodiments of the present invention is to provide a method for simulating and calculating the production of multi-layer commingled coalbed methane wells and a system for simulating and calculating the production of multi-layer commingled coalbed methane wells, so as to solve the problem of reducing the calculation error of the production of commingled wells.
  • the present invention provides a method for simulating and calculating the production of a multi-layer commingled coalbed methane well in a first aspect, the method comprising the following steps:
  • the switch status of each virtual production well and virtual injection well is set according to the bottom hole pressure of each coal seam, and the output of each virtual production well is calculated;
  • the production of multi-layer commingled production wells is calculated based on the production of each virtual production well.
  • the bottom hole pressure of each coal seam in a multi-layer commingled production well is calculated, and the method further comprises:
  • the dynamic data of the multi-layer commingled production wells are collected, and the bottom hole pressure of each coal seam is calculated based on the dynamic data; wherein the dynamic data include the dynamic liquid level height in the oil casing annulus of the multi-layer commingled production wells, the middle depth of each coal seam and the casing pressure.
  • BHPi is the bottom hole pressure
  • P is the casing pressure
  • ⁇ W is the water phase density
  • g is the gravitational acceleration
  • ⁇ g is the coalbed methane density under the conditions of casing pressure P and temperature Ti
  • Hi is the middle depth of the coal seam
  • h is the dynamic liquid level height in the oil casing annulus.
  • the perforation information is the number of perforation layers of a multi-layer commingled production well and the perforation layer position of each coal seam;
  • the step of establishing a virtual well model according to the perforation information includes:
  • the number of perforation layers of the multi-layer commingled production well set the same number of virtual production wells and virtual injection wells as the number of perforation layers;
  • the perforation layer of each virtual production well is set according to the perforation layer of each coal seam, and each coal seam corresponds to each virtual production well;
  • the perforation layer of the corresponding virtual injection well is set;
  • the wellbore diameter of each virtual production well and virtual injection well is set to be the same as the wellbore diameter of the multi-layer combined production well.
  • the method further comprises: establishing a multi-coal seam combined mining geological model, and establishing the virtual well model based on the multi-coal seam combined mining geological model.
  • setting the on/off well status of each virtual production well and each virtual injection well according to the bottom hole pressure of each coal seam and calculating the output of each virtual production well includes: setting a simulation time node;
  • the development dynamics of each virtual production well and each virtual injection well at each simulation time node are simulated and calculated, and the production of each virtual production well at the simulation time node in the development dynamics is read.
  • the setting of the on/off well status of each virtual production well and each virtual injection well according to the bottom hole pressure of each coal seam includes:
  • the injection fluid of the virtual injection well is set as follows:
  • the injected fluid is set to water
  • the injected fluid is set to the coal seam produced gas.
  • the calculation formula for the production of the multi-layer commingled production well at any time point is:
  • Q is the production of the multi-layer commingled production well at the tjth simulation time node
  • q(i,tj) is the production of the i-th virtual production well at the tjth simulation time node.
  • q takes a positive value
  • q takes a negative value.
  • an embodiment of the present invention provides a system for simulating and calculating the production of a multi-layer commingled coalbed methane well, comprising:
  • Bottom hole pressure calculation unit used to calculate the bottom hole pressure of each coal seam
  • a virtual well setting unit used for establishing a virtual well model according to perforation information
  • a virtual production well production calculation unit is used to set the switch status of the virtual production well and the virtual injection well according to the bottom hole pressure of each coal seam and calculate the production of each virtual production well;
  • the multi-layer commingled production well production calculation unit is used to calculate the production of the multi-layer commingled production well according to the production of each virtual production well.
  • the system further comprises a data acquisition unit, which is used to acquire dynamic data and perforation information of multi-layer commingled production wells;
  • the bottom hole pressure calculation unit is specifically used to calculate the bottom hole pressure of each coal seam in the multi-layer commingled production well according to the collected dynamic data of the multi-layer commingled production well.
  • an embodiment of the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for simulating and calculating the production of a multi-layer coalbed methane well as described above is implemented.
  • an embodiment of the present invention provides a computer-readable storage medium storing computer instructions.
  • the computer instructions When the computer instructions are executed on a computer, the computer executes the method for simulating and calculating the production of a multi-layer coalbed methane well as described above.
  • This method of simulating and calculating the production of multi-layer commingled coalbed methane wells can adapt to the different buried depths of coal seams and the real-time changes in the dynamic liquid level, and the differences in the bottom hole flow pressure of each layer.
  • a virtual well model is established to simulate and calculate the production of the virtual well.
  • the corresponding virtual injection well or virtual production well is opened or closed, so as to calculate the actual commingled well production and reduce the calculation error of the commingled well production.
  • the present invention takes into account the situation that the pressure at the coal seam in the existing wellbore is greater than the formation pressure, thereby solving the problem of the wellbore fluid backflowing into the formation.
  • FIG1 is a flow chart of a method for simulating and calculating the production of a multi-layer coalbed methane well provided by an embodiment of the present invention.
  • directional words such as "up, down, left, right” generally refer to the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the inventive product is usually placed when in use.
  • the terms “roughly” and “basically” are intended to explain that the relevant content does not require absolute precision, but can have certain deviations.
  • “roughly equal” does not only mean absolute equality. Since it is difficult to achieve absolute “equality” in actual production and operation, there are generally certain deviations. Therefore, in addition to absolute equality, “roughly equal” also includes the above-mentioned situation with certain deviations. Taking this as an example, in other cases, unless otherwise specified, the terms “roughly” and “basically” have similar meanings to the above.
  • connection refers to an electrical power connection or a signal connection between two components.
  • a “connection” may be a direct connection between two elements, a connection through an intermediate medium (such as a wire), or an indirect connection through a third element.
  • the "signal connection” described in this article is used to describe the signal connection between two components, such as a control signal and a feedback signal; the “electrical connection” described is used to describe the electrical power connection between two components; and the “connection” can be a direct connection between two parts or an indirect connection achieved through a third part.
  • FIG1 is a flow chart of a method for simulating and calculating the production of a multi-layer commingled coalbed methane well provided by an embodiment of the present invention.
  • a first aspect of an embodiment of the present invention provides a method for simulating and calculating the production of a multi-layer commingled coalbed methane well, the method comprising the following steps:
  • the method further includes:
  • the dynamic data of the multi-layer commingled production wells are collected, and the bottom hole pressure of each coal seam is calculated based on the dynamic data; wherein the dynamic data include the dynamic liquid level height in the oil casing annulus of the multi-layer commingled production wells, the middle depth of each coal seam and the casing pressure.
  • this embodiment adopts the echo method to obtain the dynamic data of the multi-layer commingled production well.
  • Hi is the depth of the middle of the coal seam
  • h is the height of the dynamic liquid level in the oil casing annulus.
  • BHPi is the bottom hole pressure
  • P is the casing pressure
  • ⁇ W is the water phase density, which is set to 1000kg/ m3 in this embodiment
  • g is the gravitational acceleration, which is set to 9.8m/ s2 in this embodiment
  • ⁇ g is the coalbed methane density under the conditions of casing pressure P and temperature Ti, and in this embodiment, Ti is taken as the average value of the ground temperature and the temperature of the i-th coal seam
  • Hi is the middle depth of the coal seam
  • h is the dynamic liquid level height in the casing annulus.
  • the perforation information is the number of perforation layers of the multi-layer commingled production well and the perforation layer position of each coal seam;
  • the step of establishing a virtual well model according to the perforation information includes:
  • the number of perforation layers of the multi-layer commingled production well set the same number of virtual production wells and virtual injection wells as the number of perforation layers;
  • the perforation layer of each virtual production well is set according to the perforation layer of each coal seam, and each coal seam corresponds to each virtual production well;
  • the perforation layer of the corresponding virtual injection well is set;
  • the wellbore diameter of each virtual production well and virtual injection well is set to be the same as the wellbore diameter of the multi-layer combined production well.
  • the method further includes: establishing a multi-coal seam commingled mining geological model, and establishing the virtual well model based on the multi-coal seam commingled mining geological model.
  • the simulation time step is set according to the actual collection time interval of the dynamic liquid level monitoring data, and the number of simulation time nodes is set according to the actual number of collection time nodes. If the collection time of the monitoring data is tm, the time node of the simulation calculation is set to tm, where m is the number of collected monitoring data.
  • the simulation calculates the development dynamics of all virtual wells at any simulation time node, and reads the production output of each virtual production well at that node.
  • numerical simulation software is used to simulate and calculate the development dynamics of virtual production wells and virtual injection wells, and the production of each virtual production well at the simulation time node is read.
  • setting the switch well status of the virtual production well and the virtual injection well according to the bottom hole pressure specifically includes:
  • the injection fluid of the virtual injection well is set as follows:
  • the injected fluid is set to water
  • the injected fluid is set to the coal seam produced gas.
  • the calculation formula for the production of the multi-layer commingled production well at any time point is:
  • Q is the production of the multi-layer combined production well at the tj-th simulation time node
  • q(i,tj) is the production of the i-th virtual production well at the tj-th simulation time node.
  • This method of simulating and calculating the production of multi-layer commingled coalbed methane wells can adapt to the different buried depths of coal seams and the real-time changes in the dynamic liquid level, and the differences in the bottom hole flow pressure of each layer.
  • a virtual well model is established to simulate and calculate the production of the virtual well.
  • the corresponding virtual injection well or virtual production well is opened or closed, so as to calculate the actual commingled well production and reduce the calculation error of the commingled well production.
  • the present invention takes into account the situation that the pressure at the coal seam in the existing wellbore is greater than the formation pressure, thereby solving the problem of the wellbore fluid backflowing into the formation.
  • this embodiment provides a system for simulating and calculating the production of a multi-layer commingled coalbed methane well, comprising:
  • Bottom hole pressure calculation unit used to calculate the bottom hole pressure of each coal seam
  • a virtual well setting unit used for establishing a virtual well model according to perforation information
  • a virtual production well production calculation unit used to set the switch status of the virtual production well and the virtual injection well and calculate the production of each virtual production well
  • the multi-layer commingled production well production calculation unit is used to calculate the production of the multi-layer commingled production well according to the production of each virtual production well.
  • the system further includes a data acquisition unit, which is used to acquire dynamic data and perforation information of the multi-layer commingled production well.
  • this embodiment provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for simulating and calculating the production of a multi-layer coalbed methane well as described above is implemented.
  • this embodiment provides a computer-readable storage medium storing computer instructions.
  • the computer instructions When the computer instructions are executed on a computer, the computer executes the method for simulating and calculating the production of a multi-layer coalbed methane well as described above.
  • the aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • Algebra (AREA)
  • Computing Systems (AREA)
  • Fluid Mechanics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)

Abstract

本发明提供一种模拟计算多层合采煤层气井产量的方法与系统，属于煤层气井技术领域。所述方法包括如下步骤：计算多层合采井各煤层的井底压力；采集多层合采井的射孔信息，根据所述射孔信息建立虚拟井模型，所述虚拟井模型包括多个虚拟生产井以及对应的多个虚拟注入井；设定各虚拟井的开关井状态，计算每个虚拟生产井的产量；根据每个虚拟生产井的产量计算多层合采井的产量；该方法根据井底压力打开或关闭对应的虚拟注入井或虚拟生产井，从而计算实际多层合采井的产量，减少合采井产量计算误差。

Description

模拟计算多层合采煤层气井产量的方法与系统 技术领域
本发明涉及煤层气井技术领域，具体地涉及一种模拟计算多层合采煤层气井产量的方法以及一种模拟计算多层合采煤层气井产量的系统。
背景技术
在多层合采煤层气井排采过程中，由于各煤层埋深不同和动液面高度的实时变化，导致各层的井底流压存在差异。传统的数值模拟方法通常采用净水压力梯度来考虑各层间的井底压力，即假设各煤层的井底压力差为煤层高程差对应的净水柱压力。当井筒动液面处于两煤层中间位置处时，该假设并不成立，通常会导致计算的合采井产量计算存在较大误差。此外，当煤层压力低于该层井底压力时，极易导致井筒流体倒灌进入地层，但现有的数值模拟方法无法考虑该种情况。
发明内容
本发明实施方式的目的是提供一种模拟计算多层合采煤层气井产量的方法以及一种模拟计算多层合采煤层气井产量的系统，解决减少合采井产量计算误差的问题。
为了实现上述目的，本发明第一方面提供一种模拟计算多层合采煤层气井产量的方法，所述方法包括如下步骤：
计算多层合采井各煤层的井底压力；
采集多层合采井的射孔信息，根据所述射孔信息建立虚拟井模型，所述虚拟井模型包括多个虚拟生产井以及对应的多个虚拟注入井；
根据各煤层的井底压力设定各虚拟生产井以及虚拟注入井的开关井状态，计算每个虚拟生产井的产量；
根据每个虚拟生产井的产量计算多层合采井的产量。
优选的，计算多层合采井各煤层的井底压力，所述方法还包括：
采集多层合采井的动态数据，根据所述动态数据计算各煤层的井底压力；其中，所述动态数据包括多层合采井的油套环空中的动液面高度、各煤层的煤层中部深度以及套压。
优选的，若煤层中部深度大于油套环空中的动液面高度，井底压力的计算公式为：BHPi＝P+ρW·g·(Hi-h)；
若煤层中部深度不大于油套环空中的动液面高度，井底压力的计算公式为：BHPi＝P+ρg·g·h；
其中，BHPi为井底压力；P为套压；ρW为水相密度；g为重力加速度；ρg为在套压P、温度Ti条件下的煤层气密度；Hi为煤层中部深度；h为油套环空中的动液面高度。
优选的，所述射孔信息为多层合采井的射孔层数以及各煤层所在的射孔层位；
所述根据射孔信息建立虚拟井模型，包括：
根据多层合采井的射孔层数设定与射孔层数相同数量的虚拟生产井以及虚拟注入井；
根据各煤层的射孔层位设定各虚拟生产井的射孔层位，每一煤层对应每一虚拟生产井；
根据每一虚拟生产井的射孔层位设定对应的虚拟注入井的射孔层位；
将每一虚拟生产井以及虚拟注入井的井筒直径设定为与所述多层合采井的井筒直径相同。
优选的，所述方法还包括：建立多煤层合采地质模型，在所述多煤层合采地质模型的基础上建立所述虚拟井模型。
优选的，所述根据各煤层的井底压力设定各虚拟生产井和各虚拟注入井的开关井状态，计算各虚拟生产井的产量，包括：设定模拟时间节点；
模拟计算各虚拟生产井和各虚拟注入井在每一模拟时间节点的开发动态，并读取开发动态中每一虚拟生产井在模拟时间节点的产量。
优选的，所述根据各煤层的井底压力设定各虚拟生产井和各虚拟注入井的开关井状态，包括：
在当前煤层的井底压力小于当前煤层压力的情况下，打开与该煤层的射孔层位相同的虚拟生产井，关闭与该煤层的射孔层位相同的虚拟注入井；
在当前煤层的井底压力不小于当前煤层压力的情况下，打开与该煤层的射孔层位相同的虚拟注入井，关闭与该煤层的射孔层位相同的虚拟生产井。
优选的，所述虚拟注入井的注入流体设定方式为：
当煤层中部深度大于油套环空中的动液面高度时，注入流体设定为水；
当煤层中度深度小于或等于油套环空中的动液面高度时，注入流体设定为煤层产出气。
优选的，所述多层合采井在任意时间节点的产量的计算公式为：
其中，Q为第tj个模拟时间节点的多层合采井的产量，q(i,tj)为第i个虚拟生产井在第tj个模拟时间节点的产量。对虚拟生产井，q取正值；对虚拟注入井，q取负值。
第二方面，本发明实施例提供一种模拟计算多层合采煤层气井产量的系统，包括：
井底压力计算单元，用于计算各煤层的井底压力；
虚拟井设置单元，用于根据射孔信息建立虚拟井模型；
虚拟生产井产量计算单元，用于根据各煤层的井底压力设定虚拟生产井以及虚拟注入井的开关井状态以及计算各虚拟生产井的产量；
多层合采井产量计算单元，用于根据各虚拟生产井的产量计算多层合采井的产量。
优选的，所述系统还包括数据采集单元，所述数据采集单元用于采集多层合采井的动态数据以及射孔信息；
所述井底压力计算单元具体用于根据所采集的多层合采井的动态数据计算多层合采井各煤层的井底压力。
第三方面，本发明实施例提供一种电子设备，包括存储器、处理器以及存储在所述存储器中并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现如上所述的模拟计算多层合采煤层气井产量的方法。
第四方面，本发明实施例提供一种计算机可读储存介质，存储有计算机指令，当所述计算机指令在计算机上运行时，使得计算机执行如上所述的模拟计算多层合采煤层气井产量的方法。
该模拟计算多层合采煤层气井产量的方法，能够适应各煤层埋深不同和动液面的实时变化，适应各层的井底流压存在差异，并根据各煤层的井底压力，建立虚拟井模型，模拟计算虚拟井产量。根据井底压力，打开或关闭对应的虚拟注入井或虚拟生产井，从而计算实际合采井产量，减少合采井产量计算误差。
且本发明考虑了现井筒中煤层位置处压力大于地层压力的情况，解决了井筒流体倒灌进入地层的现象。
本发明实施方式的其它特征和优点将在随后的具体实施方式部分予以详细说明。
附图说明
附图是用来提供对本发明实施例的进一步理解，并且构成说明书的一部分，与下面的具体实施方式一起用于解释本发明实施例，但并不构成对本发明实施例的限制。在附图中：
图1是本发明一种实施方式提供的一种模拟计算多层合采煤层气井产量的方法的流程图。
具体实施方式
以下结合附图对本发明实施例的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本发明实施例，并不用于限制本发明实施例。
在本发明实施例中，在未作相反说明的情况下，使用的方位词如“上、下、左、右”通常是指基于附图所示的方位或位置关系，或者是该发明产品使用时惯常摆放的方位或位置关系。
术语“第一”、“第二”、“第三”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
术语“平行”、“垂直”等并不表示要求部件绝对平行或垂直，而是可以稍微倾斜。如“平行”仅仅是指其方向相对“垂直”而言更加平行，并不是表示该结构一定要完全平行，而是可以稍微倾斜。
术语“水平”、“竖直”、“悬垂”等术语并不表示要求部件绝对水平、竖直或悬垂，而是可以稍微倾斜。如“水平”仅仅是指其方向相对“竖直”而言更加水平，并不是表示该结构一定要完全水平，而是可以稍微倾斜。
此外，“大致”、“基本”等用语旨在说明相关内容并不是要求绝对的精确，而是可以有一定的偏差。例如：“大致相等”并不仅仅表示绝对的相等，由于实际生产、操作过程中，难以做到绝对的“相等”，一般都存在一定的偏差。因此，除了绝对相等之外，“大致等于”还包括上述的存在一定偏差的情况。以此为例，其他情况下，除非有特别说明，“大致”、“基本”等用语均为与上述类似的含义。
在本发明的描述中，还需要说明的是，除非另有明确的规定和限定，术语“设置”、“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。
本文所述的“连接”用于表述两个部件之间的电功率连接或信号连接；“连接”可以是两个元件的直接连接，也可以是通过中间媒介(例如导线)相连，还可以是通过第三个元件实现的间接连接。
本文所述的“信号连接”用于表述两个部件之间的信号连接，例如控制信号和反馈信号；所述的“电连接”用于表述两个部件之间的电功率连接；“连接”可以是两个零件之间的直接连接，也可以是通过第三个零件实现的间接连接。
实施例1
图1是本发明一种实施方式提供的一种模拟计算多层合采煤层气井产量的方法流程图。如图1所示，本发明实施方式第一方面提供一种模拟计算多层合采煤层气井产量的方法，所述方法包括如下步骤：
S1.计算多层合采井各煤层的井底压力；
在本实施例中，所述方法还包括：
采集多层合采井的动态数据，根据所述动态数据计算各煤层的井底压力；其中，所述动态数据包括多层合采井的油套环空中的动液面高度、各煤层的煤层中部深度以及套压。
进一步的，本实施例采用回声法获取多层合采井的动态数据。
在本实施例中，Hi为煤层中部深度，h为油套环空中的动液面高度。在本实施例中，若煤层中部深度大于油套环空中的动液面高度(Hi>h),即第i层煤层位于动液面以下，井底压力的计算公式为：
BHPi＝P+ρW·g·(Hi-h)；
若煤层中部深度不大于油套环空中的动液面高度(Hi≤h)，即第i层煤层位于动液面以上或与动液面持平，井底压力的计算公式为：
BHPi＝P+ρg·g·h；
其中，BHPi为井底压力；P为套压；ρW为水相密度，在本实施例中设定为1000kg/m3；g为重力加速度，在本实施例中设定为9.8m/s2；ρg为在套压P、温度Ti条件下的煤层气密度，在本实施例中，Ti取作地面温度与第i层煤层温度的平均值；Hi为煤层中部深度；h为油套环空中的动液面高度。
S2.采集多层合采井的射孔信息，根据所述射孔信息建立虚拟井模型，所述虚拟井模型包括多个虚拟生产井以及对应的多个虚拟注入井；
在本实施例中，所述射孔信息为多层合采井的射孔层数以及各煤层所在的射孔层位；
所述根据射孔信息建立虚拟井模型，包括：
根据多层合采井的射孔层数设定与射孔层数相同数量的虚拟生产井以及虚拟注入井；
根据各煤层的射孔层位设定各虚拟生产井的射孔层位，每一煤层对应每一虚拟生产井；
根据每一虚拟生产井的射孔层位设定对应的虚拟注入井的射孔层位；
将每一虚拟生产井以及虚拟注入井的井筒直径设定为与所述多层合采井的井筒直径相同。
在本实施例中，所述方法还包括：建立多煤层合采地质模型，在所述多煤层合采地质模型的基础上建立所述虚拟井模型。
具体的，若实际的多层合采井的射孔层数为n，则设定虚拟生产井的总数量为n，虚拟注入井的总数量也为n；设置第i口虚拟生产井的射孔层位：即第i口虚拟生产井的射孔位置＝实际井自井口起至井底的第i段射孔煤层。
S3.根据各煤层的井底压力设定各虚拟井的开关井状态，计算每个虚拟生产井的产量；
在本实施例中，所述计算每个虚拟生产井的产量具体为：
根据所述井底压力设定虚拟生产井以及虚拟注入井的开关井状态；
设定模拟时间步长以及模拟时间节点；
进一步的，根据实际动液面监测数据的采集时间间隔设定模拟时间步长，根据实际采集时间节点数设定模拟时间节点数。若监测数据的采集时间为tm，则模拟计算的时间节点设置为tm，其中m为采集的监测数据数量。
模拟计算所有虚拟井在任一模拟时间节点的开发动态，并读取每一虚拟生产井在该节点的生产产量。
在本实施例中，对于任意模拟时间节点，采用数值模拟软件模拟计算虚拟生产井以及虚拟注入井的开发动态，并读取每一虚拟生产井在该模拟时间节点的产量。
在本实施例中，所述根据所述井底压力设定虚拟生产井以及虚拟注入井的开关井状态具体包括：
在当前煤层的井底压力小于当前煤层压力的情况下，打开具有与该煤层的射孔层位相同的射孔层位的虚拟生产井，关闭具有与该煤层的射孔层位相同的射孔层位的虚拟注入井；
在当前煤层的井底压力不小于当前煤层压力的情况下，打开具有与该煤层的射孔层位相同的射孔层位的虚拟注入井，关闭具有与该煤层的射孔层位相同的射孔层位的虚拟生产井。
在本实施例中，所述虚拟注入井的注入流体设定方式为：
当煤层中部深度大于油套环空中的动液面高度时，注入流体设定为水；
当煤层中度深度小于或等于油套环空中的动液面高度时，注入流体设定为煤层产出气。
S4.根据每个虚拟生产井的产量计算多层合采井的产量。
在本实施例中，所述多层合采井在任意时间节点的产量的计算公式为：
其中，Q为第tj个模拟时间节点的多层合采井的产量，q(i,tj)为第i个虚拟生产井在第tj个模拟时间节点的产量。
该模拟计算多层合采煤层气井产量的方法，能够适应各煤层埋深不同和动液面的实时变化，适应各层的井底流压存在差异，并根据各煤层的井底压力，建立虚拟井模型，模拟计算虚拟井产量。根据井底压力，打开或关闭对应的虚拟注入井或虚拟生产井，从而计算实际合采井产量，减少合采井产量计算误差。
且本发明考虑了现井筒中煤层位置处压力大于地层压力的情况，解决了井筒流体倒灌进入地层的现象。
第二方面，本实施例提供一种模拟计算多层合采煤层气井产量的系统，包括：
井底压力计算单元，用于计算各煤层的井底压力；
虚拟井设置单元，用于根据射孔信息建立虚拟井模型；
虚拟生产井产量计算单元，用于设定虚拟生产井以及虚拟注入井的开关井状态以及计算各虚拟生产井的产量；
多层合采井产量计算单元，用于根据各虚拟生产井的产量计算多层合采井的产量。
在本实施例中，所述系统还包括数据采集单元，所述数据采集单元用于采集多层合采井的动态数据以及射孔信息。
第三方面，本实施例提供一种电子设备，包括存储器、处理器以及存储在所述存储器中并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现如上所述的模拟计算多层合采煤层气井产量的方法。
第四方面，本实施例提供一种计算机可读储存介质，存储有计算机指令，当所述计算机指令在计算机上运行时，使得计算机执行如上所述的模拟计算多层合采煤层气井产量的方法。
本领域技术人员可以理解实现上述实施方式的方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序存储在一个存储介质中，包括若干指令用以使得单片机、芯片或处理器(processor)执行本发明各个实施方式所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上结合附图详细描述了本发明实施例的可选实施方式，但是，本发明实施例并不限于上述实施方式中的具体细节，在本发明实施例的技术构思范围内，可以对本发明实施例的技术方案进行多种简单变型，这些简单变型均属于本发明实施例的保护范围。
另外需要说明的是，在上述具体实施方式中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合。为了避免不必要的重复，本发明实施例对各种可能的组合方式不再另行说明。
此外，本发明实施例的各种不同的实施方式之间也可以进行任意组合，只要其不违背本发明实施例的思想，其同样应当视为本发明实施例所公开的内容。

Claims (12)

  1. 一种模拟计算多层合采煤层气井产量的方法，其特征在于，所述方法包括如下步骤：
    计算多层合采井各煤层的井底压力；
    采集多层合采井的射孔信息，根据射孔信息建立虚拟井模型，所述虚拟井模型包括多个虚拟生产井以及对应的多个虚拟注入井；
    根据各煤层的井底压力设定各虚拟生产井和各虚拟注入井的开关井状态，计算每个虚拟生产井的产量；
    根据各虚拟生产井的产量计算多层合采井的产量。
  2. 根据权利要求1所述的模拟计算多层合采煤层气井产量的方法，其特征在于，计算多层合采井各煤层的井底压力，包括：
    采集多层合采井的动态数据；
    根据所述动态数据计算多层合采井各煤层的井底压力；其中，所述动态数据包括多层合采井的油套环空中的动液面高度、各煤层的煤层中部深度以及套压。
  3. 根据权利要求2所述的模拟计算多层合采煤层气井产量的方法，其特征在于，
    若煤层中部深度大于油套环空中的动液面高度，井底压力的计算公式为：BHPi＝P+ρW·g·(Hi-h)；
    若煤层中部深度不大于油套环空中的动液面高度，井底压力的计算公式为：BHPi＝P+ρg·g·h；
    其中，BHPi为井底压力；P为套压；ρW为水相密度；g为重力加速度；ρg为在套压P、温度Ti条件下的煤层气密度；Hi为煤层中部深度；h为油套环空中的动液面高度。
  4. 根据权利要求1所述的模拟计算多层合采煤层气井产量的方法，其特征在于，所述射孔信息为多层合采井的射孔层数以及各煤层所在的射孔层位；
    所述根据射孔信息建立虚拟井模型，包括：
    根据多层合采井的射孔层数设定与射孔层数相同数量的虚拟生产井以及虚拟注入井；
    根据各煤层的射孔层位设定各虚拟生产井的射孔层位，每一煤层对应每一虚拟生产井；
    根据每一虚拟生产井的射孔层位设定对应的虚拟注入井的射孔层位；
    将每一虚拟生产井以及虚拟注入井的井筒直径设定为与所述多层合采井的井筒直径相同。
  5. 根据权利要求4所述的模拟计算多层合采煤层气井产量的方法，其特征在于，所述根据各煤层的井底压力设定各虚拟生产井和各虚拟注入井的开关井状态，计算各虚拟生产井的产量，包括：
    设定模拟时间节点；
    模拟计算各虚拟生产井和各虚拟注入井在每一模拟时间节点的开发动态，并读取开发动态中每一虚拟生产井在模拟时间节点的产量。
  6. 根据权利要求5所述的模拟计算多层合采煤层气井产量的方法，其特征在于，所述根据各煤层的井底压力设定各虚拟生产井和各虚拟注入井的开关井状态，包括：
    在当前煤层的井底压力小于当前煤层压力的情况下，打开与该煤层的射孔层位相同的虚拟生产井，关闭与该煤层的射孔层位相同的虚拟注入井；
    在当前煤层的井底压力不小于当前煤层压力的情况下，打开与该煤层的射孔层位相同的虚拟注入井，关闭与该煤层的射孔层位相同的虚拟生产井。
  7. 根据权利要求1所述的模拟计算多层合采煤层气井产量的方法，其特征在于，所述虚拟注入井的注入流体设定方式为：
    若煤层中部深度大于油套环空中的动液面，注入流体设定为水；
    若煤层中度深度不大于油套环空中的动液面，注入流体设定为煤层产出气。
  8. 根据权利要求5所述的模拟计算多层合采煤层气井产量的方法，其特征在于，所述多层合采井在任一模拟时间节点的产量的计算公式为：
    其中，Q为第tj个模拟时间节点的多层合采井的产量，q(i,tj)为第i个虚拟生产井在第tj个模拟时间节点的产量。
  9. 一种模拟计算多层合采煤层气井产量的系统，其特征在于，包括：
    井底压力计算单元，用于计算各煤层的井底压力；
    虚拟井设置单元，用于根据射孔信息建立虚拟井模型；
    虚拟生产井产量计算单元，用于根据各煤层的井底压力设定虚拟生产井以及虚拟注入井的开关井状态以及计算各虚拟生产井的产量；
    多层合采井产量计算单元，用于根据各虚拟生产井的产量计算多层合采井的产量。
  10. 根据权利要求9所述的模拟计算多层合采煤层气井产量的系统，其特征在于，所述系统还包括数据采集单元，所述数据采集单元用于采集多层合采井的动态数据以及射孔信息；
    所述井底压力计算单元具体用于根据所采集的多层合采井的动态数据计算多层合采井各煤层的井底压力。
  11. 一种电子设备，包括存储器、处理器以及存储在所述存储器中并可在所述处理器上运行的计算机程序，其特征在于，所述处理器执行所述计算机程序时实现权利要求1-8中任一项所述的模拟计算多层合采煤层气井产量的方法。
  12. 一种计算机可读储存介质，存储有计算机指令，其特征在于，当所述计算机指令在计算机上运行时，使得计算机执行权利要求1-8中任一项所述的模拟计算多层合采煤层气井产量的方法。
PCT/CN2023/142093 2023-04-04 2023-12-26 模拟计算多层合采煤层气井产量的方法与系统 Ceased WO2024207828A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2023442355A AU2023442355A1 (en) 2023-04-04 2023-12-26 Method and system for simulating and calculating yield of multilayer commingled production coalbed methane well

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202310357976.3 2023-04-04
CN202310357976.3A CN118780188A (zh) 2023-04-04 2023-04-04 模拟计算多层合采煤层气井产量的方法与系统

Publications (1)

Publication Number Publication Date
WO2024207828A1 true WO2024207828A1 (zh) 2024-10-10

Family

ID=92971012

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/142093 Ceased WO2024207828A1 (zh) 2023-04-04 2023-12-26 模拟计算多层合采煤层气井产量的方法与系统

Country Status (3)

Country Link
CN (1) CN118780188A (zh)
AU (1) AU2023442355A1 (zh)
WO (1) WO2024207828A1 (zh)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101799466A (zh) * 2010-01-26 2010-08-11 煤炭科学研究总院西安研究院 一种煤层气生产物理模拟装置及其模拟方法
US20160186535A1 (en) * 2011-02-09 2016-06-30 Saudi Arabian Oil Company Sequential fully implicit well model with tridiagonal matrix structure for reservoir simulation
CN106777574A (zh) * 2016-11-30 2017-05-31 中石化石油工程技术服务有限公司 一种页岩气水平井两相流条件下井口井底压力换算方法
CN107145696A (zh) * 2017-06-29 2017-09-08 中国石油大学(北京) 一种煤层气地上地下耦合求解的模拟方法
CN108229713A (zh) * 2016-12-09 2018-06-29 中国石油化工股份有限公司 断块油藏多层合采方案优化设计方法
CN110397425A (zh) * 2019-07-12 2019-11-01 中国石油大学(北京) 煤层气生产井井底流压控制系统及控制方法
CN111236908A (zh) * 2020-01-09 2020-06-05 西南石油大学 一种适用在低渗透致密气藏中的多段压裂水平井产能预测模型及产能敏感性分析的方法
CN111472722A (zh) * 2020-03-12 2020-07-31 中国石油天然气股份有限公司 煤层气合采井分层产气能力预测方法以及装置
CN111691869A (zh) * 2019-03-15 2020-09-22 中国石油化工股份有限公司 一种高含水致密气藏气井产量变化趋势的预测方法
CN114169158A (zh) * 2021-11-30 2022-03-11 中国石油大学(北京) 一种致密砂岩气藏多层合采产能预测方法、装置及设备
US20230017069A1 (en) * 2021-07-13 2023-01-19 Southwest Petroleum University Prediction method for constant production decline of water-producing gas well in highly heterogeneous reservoir

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101799466A (zh) * 2010-01-26 2010-08-11 煤炭科学研究总院西安研究院 一种煤层气生产物理模拟装置及其模拟方法
US20160186535A1 (en) * 2011-02-09 2016-06-30 Saudi Arabian Oil Company Sequential fully implicit well model with tridiagonal matrix structure for reservoir simulation
CN106777574A (zh) * 2016-11-30 2017-05-31 中石化石油工程技术服务有限公司 一种页岩气水平井两相流条件下井口井底压力换算方法
CN108229713A (zh) * 2016-12-09 2018-06-29 中国石油化工股份有限公司 断块油藏多层合采方案优化设计方法
CN107145696A (zh) * 2017-06-29 2017-09-08 中国石油大学(北京) 一种煤层气地上地下耦合求解的模拟方法
CN111691869A (zh) * 2019-03-15 2020-09-22 中国石油化工股份有限公司 一种高含水致密气藏气井产量变化趋势的预测方法
CN110397425A (zh) * 2019-07-12 2019-11-01 中国石油大学(北京) 煤层气生产井井底流压控制系统及控制方法
CN111236908A (zh) * 2020-01-09 2020-06-05 西南石油大学 一种适用在低渗透致密气藏中的多段压裂水平井产能预测模型及产能敏感性分析的方法
CN111472722A (zh) * 2020-03-12 2020-07-31 中国石油天然气股份有限公司 煤层气合采井分层产气能力预测方法以及装置
US20230017069A1 (en) * 2021-07-13 2023-01-19 Southwest Petroleum University Prediction method for constant production decline of water-producing gas well in highly heterogeneous reservoir
CN114169158A (zh) * 2021-11-30 2022-03-11 中国石油大学(北京) 一种致密砂岩气藏多层合采产能预测方法、装置及设备

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DAI TAO, YUE GUANGLAI, YANG YAOZHONG ET AL.: "Study on pseudo-3D numerical simulation of multilayer oil reservoir", PETROLEUM GEOLOGY AND RECOVERY EFFICIENCY, vol. 8, no. 3, 25 June 2001 (2001-06-25), XP093220053, ISSN: 1009-9603, DOI: 10.13673/j.cnki.cn37-1359/te.2001.03.014 *
TONG ZHAORUI: "Numerical simulation and rationality analysis of multi-layer commingled production in gas wells", CHINA MASTER'S THESES FULL-TEXT DATABASE, 1 June 2016 (2016-06-01), XP093220050 *

Also Published As

Publication number Publication date
CN118780188A (zh) 2024-10-15
AU2023442355A1 (en) 2025-09-11

Similar Documents

Publication Publication Date Title
CN107563899B (zh) 油气井产能预测方法及装置
AU2015229274B2 (en) Efficient and robust compositional reservoir simulation using a fast phase envelope
EP3100161B1 (en) Modified black oil model for calculating mixing of different fluids in a common surface network
US9835012B2 (en) Simplified compositional models for calculating properties of mixed fluids in a common surface network
GB2626674A (en) Method to tailor cement properties and optimize injection schedule for near wellbore integrity in carbon storage/injection wells
CN113792426A (zh) 地下盐穴储气库可注采气量确定方法及装置
Shaoul et al. Developing a tool for 3D reservoir simulation of hydraulically fractured wells
CN112324428B (zh) 气井流入动态曲线的校正方法、装置和计算机存储介质
WO2024207828A1 (zh) 模拟计算多层合采煤层气井产量的方法与系统
CN106285657B (zh) 用于确定缝洞型油藏溶洞发生坍塌事件的方法及系统
CN111472722B (zh) 煤层气合采井分层产气能力预测方法以及装置
EP3090337B1 (en) Simulating fluid production in a common surface network using eos models with black oil models
Hu et al. Integrated wellbore/reservoir dynamic simulation
CN119227435A (zh) 一种地热田开采阶段可持续开采量计算方法
CN120373170A (zh) 一种页岩油井压恢试井解释方法、装置及电子设备
CN111335949A (zh) 基于水封作用方式的水幕系统优化设计方法
CN119106502A (zh) 一种储气库注采能力的确定方法和装置
CN108920795B (zh) 热采生产井井底蒸汽腔预测方法及装置
CN115935600A (zh) 应用于矿场条件的注气波及效果评价方法及装置
CN117993310A (zh) 一种页岩气井压裂后闷井时间优化方法和装置
CN115559714A (zh) 一种多分支断溶体油藏缝洞参数的确定方法及系统
CN106803003A (zh) 确定流体的井口注入相态的方法及装置
CN106227903A (zh) 底水层钻开厚度的确定方法及装置
CN107654221B (zh) 储层选择性酸化的方法及装置
CN114075937B (zh) 采用双壁钻杆进行冲捞砂的控制方法和装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23931873

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: AU2023442355

Country of ref document: AU

ENP Entry into the national phase

Ref document number: 2023442355

Country of ref document: AU

Date of ref document: 20231226

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 23931873

Country of ref document: EP

Kind code of ref document: A1