Method for evaluating influence on gas well yield after series connection of gas production pipelines of gas well

Abstract

The invention belongs to the technical field of gas field development, and particularly relates to a method for evaluating the influence on gas well yield after series connection of gas well gas production pipelines. According to the method, related parameter values in a to-be-evaluated gas well are obtained; gas well fluid components are determined; a multiphase flow model of a gas production pipe network related to gas well series connection is optimized; gas well and pipeline parameters are input and modeled; the method comprises the seven steps of obtaining the yield of the gas well connected in series through simulation calculation and using the obtained yield result for guiding the ground pipeline laying and the production system of well opening in the production management after the gas well is put into production, and the thought of gas well-ground integrated coupling modeling is adopted, so that the influence of series connection on a gas production pipeline is simply, conveniently and rapidly analyzed; the blindness of the cascading process is reduced, and a basis is provided for optimization of the gas field cascading process. The problems that after a new well and an old well are connected in series, and gas wells with good productivity and poor productivity are connected in series, inter-well pressure is unbalanced, and the yield of the gas wells is affected are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of gas field development, and in particular relates to a method for evaluating the influence of series connection of gas production pipelines of gas wells on the production of gas wells. Background Art

[0002] In recent years, in order to improve the utilization rate of gas production pipelines and reduce the number of stations and investments for renovation and expansion, some gas wells in some gas fields have adopted a multi-well series connection mode for production. For example, the application number CN200820222468.5, named Coalbed Methane Non-metallic Pipeline Multi-Well Series Connection Device, is a tool for multi-well series connection. However, due to factors such as inter-well pressure interference, unbalanced distribution of alcohol injection, and inadequate production management, after the new wells and old wells, and gas wells with good and poor production capacity are connected in series, the pressure between the wells is unbalanced, resulting in problems such as pressure shielding for gas wells with poor production capacity and low pressure; the gas wells use a multi-well series connection mode to open the well at a low rate, and the gas well production capacity is affected. Therefore, it is necessary to conduct a quantitative assessment of the impact of gas well series connection on production capacity, and use it to guide gas well production management to improve production time and increase production capacity. Summary of the invention

[0003] The present invention provides a method for evaluating the influence of gas well production after gas production pipelines are connected in series. One purpose is to provide a simple and rapid analysis of the influence of connection in series on gas production pipelines, and to quantitatively evaluate the influence of production capacity caused by the connection in series of gas wells; the second purpose is to provide a method for solving the problem of large manual operation, high labor intensity and high operation safety risk when "determining / evaluating the influence of connection in series on production capacity of old wells in Jingbian gas field requires rotation of wellheads and separate metering of separators in gas gathering stations"; the third purpose is to provide a method for solving the problem of "capacity changes of new wells in series with pre-laid gas production pipelines cannot be quantitatively predicted", which can achieve simulation calculations in advance before pipeline laying, optimize the gas production pipeline laying plan, reduce the blindness of the connection process, and provide a basis for optimizing the connection process of gas fields.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for evaluating the impact of gas well production lines connected in series on gas well production comprises the following steps:

[0006] Step 1: Obtain relevant parameter values ​​of the gas well to be evaluated;

[0007] The relevant parameters include the measured data parameter values ​​of gas well quality, well depth structure data values, well completion data values ​​and gas production network parameter values;

[0008] Step 2: Determine the gas well fluid composition;

[0009] Step 3: Optimize the flow model of the gas production pipeline network related to the gas wells;

[0010] Step 4: Input and model the gas well and pipeline parameters;

[0011] Step 5: Determine boundary conditions;

[0012] Step 6: Obtain the production of the series-connected gas wells through simulation calculation;

[0013] Step 7: Use the results obtained in step 6 to guide the production system of surface pipeline laying and intermediate well opening in production management after the gas well is put into production.

[0014] The well depth structure data obtained in step 1 include the well depth and well diameter data of the gas well; the completion data include the perforation depth, production capacity equation and gas well formation pressure data; the gas production network parameters include the actual data of the length, inner diameter, wall thickness, roughness and elevation distribution of each pipeline.

[0015] The gas well formation pressure data used is the formation pressure data of the recent year.

[0016] The method for determining the gas well fluid components in step 2 is to input the measured data parameters of the gas well gas quality into the pipesim software, establish a gas well output fluid component model, and obtain the components of the gas well output fluid.

[0017] The process of the step 3 of optimizing the flow model of the gas wells in series with the relevant gas production pipeline network is as follows:

[0018] S1. According to the measured data parameters of gas well quality of the gas well output fluid components obtained in step 2, select the model equations of horizontal flow and vertical flow in the simulation setting option in the pipesim software;

[0019] S2. Input the corresponding height, length and inner diameter of each pipeline;

[0020] S3. According to the classic model provided by pipesim software, select the model that meets the working conditions;

[0021] S4. Connect the gas production pipeline according to the actual series connection method of the gas wells.

[0022] The serial connection methods include wellhead serial connection, midway serial connection and pre-station serial connection.

[0023] The detailed process of modeling in step 4 is as follows:

[0024] Step 1: Input the oil casing length, artificial well bottom, packer depth, heat transfer efficiency, and soil temperature of the corresponding gas well into the gas well model in the pipesim software;

[0025] Step 2: Set the IPR model of the gas well to the Jones model, input the gas reservoir pressure, gas reservoir temperature, and production capacity binomial coefficients A and B of the gas well; and select the fluid model established in step 3 as the fluid running in the formation-gas wellbore;

[0026] Step 3: Set the inlet pressure and temperature of the gas gathering station at the end of the pipeline.

[0027] The boundary condition determination in step five refers to the determination of the gas reservoir temperature, pressure and the corresponding gas gathering station inlet pressure and temperature when calculating the entire pressure system from the formation to the well and then to the gas production pipeline.

[0028] The process of obtaining the production of the series-connected gas wells through simulation calculation in step 6 is as follows:

[0029] Step 1: Select the pipe network simulation function in the pipesim software and select the simulation boundary condition as "gas reservoir parameters";

[0030] Step 2: Input the current reservoir pressure and temperature of the gas well, the current pressure and temperature at the end of the gas production pipeline, and click the Run Calculation button;

[0031] Step 3: Select standard international units based on the calculated output data to obtain the production of the gas wells after series connection.

[0032] Beneficial effects:

[0033] (1) The present invention adopts the technical concept of "gas well-ground integrated coupling modeling", which can simply and quickly analyze the impact of series connection on the gas production pipeline, provide a basis for optimizing the series connection process of the gas field, and reduce the blindness of the series connection process.

[0034] (2) The present invention can guide the production system of the intermittent wells in the production management after the gas well is put into production, thereby minimizing the impact of the gas volume caused by the imbalance of high and low pressures.

[0035] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 paying creative work.

[0037] Figure 1 It is a flow chart of the present invention.

[0038] Figure 2 It is a schematic diagram of gas well-ground integrated modeling in a specific implementation manner of the present invention.

[0039] Figure 3 It is a schematic diagram of formation-wellbore modeling in a specific implementation manner of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0041] Embodiment 1:

[0042] Reference Figure 1 As shown, a method for evaluating the impact of gas well production pipelines connected in series on gas well production includes the following steps:

[0043] Step 1: Obtain relevant parameter values ​​of the gas well to be evaluated;

[0044] The relevant parameters include the measured data parameter values ​​of gas well quality, well depth structure data values, well completion data values ​​and gas production network parameter values;

[0045] Step 2: Determine the gas well fluid composition;

[0046] Step 3: Optimize the flow model of the gas production pipeline network related to the gas wells;

[0047] Step 4: input and model the gas well and pipeline parameters; Step 5: determine the boundary conditions;

[0048] Step 6: Obtain the production of the series-connected gas wells through simulation calculation;

[0049] Step 7: Use the results obtained in step 6 to guide the production system of surface pipeline laying and intermediate well opening in production management after the gas well is put into production.

[0050] In actual use, the present invention realizes the numerical simulation of gas well-ground integrated coupling through the establishment of gas well formation and wellbore models, the setting of gas production pipeline model + gas gathering station inlet pressure, and realizes the quantitative evaluation of the production capacity impact caused by general gas well series connection problems, and uses it to guide the laying of ground pipelines during capacity construction; and in the production management after the gas well is put into production, it can guide the production system of interleaved wells to minimize the gas volume impact caused by high and low pressure imbalance.

[0051] Embodiment 2:

[0052] Reference Figure 1 As shown, a method for evaluating the impact of gas well production pipelines connected in series on gas well production is different from Example 1 in that: the well depth structure data obtained in step 1 includes the well depth and well diameter data of the gas well; the completion data includes the perforation depth, production capacity equation and gas well formation pressure data; the gas production pipeline network parameters include the actual data of the length, inner diameter, wall thickness, roughness and elevation distribution of each pipeline.

[0053] Furthermore, the gas well formation pressure data used is the formation pressure data of the past year.

[0054] In actual use, by obtaining the above data for relevant modeling and calculation, the results are made closer to the actual gas wells, providing a scientific and accurate basis for guiding the laying of ground pipelines and the production system of well opening in the production management after the gas wells are put into production.

[0055] Embodiment three:

[0056] Reference Figure 1 and Figure 2 As shown, a method for evaluating the impact of gas well production pipelines connected in series on gas well production is different from Example 1 in that: the method for determining the gas well fluid component in step 2 is to input the gas well gas quality measured data parameters into the pipesim software, establish a gas well production fluid component model, and obtain the gas well production fluid component.

[0057] In actual use, different fluid components will affect the efficiency of gas well pressure transmission. A high pressure transmission efficiency will result in a high simulated gas well production, while a low pressure transmission efficiency will result in a low simulated gas well production. The components of the gas well output fluid obtained can be more closely matched to the gas well to be evaluated, making the final result more accurate. Figure 2 shown.

[0058] The above process is to input various fluid components and contents in the gas well into the pipesim software, such as CH 4 , CO 2 , C 2 H 5 and the corresponding contents, which are derived from laboratory tests of gas produced from gas wells.

[0059] Embodiment 4:

[0060] Reference Figure 1 As shown, a method for evaluating the impact of gas well production lines connected in series on gas well production is different from the first embodiment in that the process of the flow model of the gas production network related to the gas well series connection in step 3 is as follows:

[0061] S1. According to the measured data parameters of gas well quality of the gas well output fluid components obtained in step 2, select the model equations of horizontal flow and vertical flow in the simulation setting option in the pipesim software;

[0062] S2. Input the corresponding height, length and inner diameter of each pipeline;

[0063] S3. According to the classic model provided by pipesim software, select the model that meets the working conditions;

[0064] S4. Connect the gas production pipeline according to the actual series connection method of the gas wells.

[0065] In actual use, the process of establishing a flow model is to determine the flow equation corresponding to the natural gas migration in the horizontal and vertical pipes, which is the basis for subsequent simulations.

[0066] The purpose of optimization is to reduce the error in gas volume calculation of serially connected gas wells and improve the calculation accuracy by selecting a suitable model.

[0067] Embodiment five:

[0068] Reference Figure 1 and Figure 3 As shown, a method for evaluating the impact of gas well production lines connected in series on gas well production is different from the first embodiment in that the detailed process of modeling in step 4 is as follows:

[0069] Step 1: Input the oil casing length, artificial well bottom, packer depth, heat transfer efficiency, and soil temperature of the corresponding gas well into the gas well model in the pipesim software;

[0070] Step 2: Set the IPR model of the gas well to the Jones model, input the gas reservoir pressure, gas reservoir temperature, and production capacity binomial coefficients A and B of the gas well; and select the fluid model established in step 3 as the fluid running in the formation-gas wellbore;

[0071] Step 3: Set the inlet pressure and temperature of the gas gathering station at the end of the pipeline.

[0072] In actual use, the modeling of this technical solution, the establishment of a gas well model and the setting of the parameters of the gas gathering station at the end of the pipeline are the basis for subsequent simulation calculations. Figure 3 shown.

[0073] Embodiment six:

[0074] Reference Figure 1As shown, a method for evaluating the impact of gas well production pipelines connected in series on gas well production is different from Example 1 in that: the boundary condition determination in step five refers to the determination of the gas reservoir temperature, pressure and the corresponding gas gathering station inlet pressure and temperature when calculating the entire pressure system from the formation to the well and then to the gas pipeline.

[0075] In actual use, boundary conditions such as the current gas reservoir temperature and pressure of the gas well, and the pressure of the gas gathering station are the basis of the simulation and must be set before gas production calculation can be performed.

[0076] Embodiment seven:

[0077] Reference Figure 1 As shown, a method for evaluating the impact of gas well production pipelines connected in series on gas well production is different from the first embodiment in that the process of obtaining the production of the connected gas wells by simulation calculation in step 6 is as follows:

[0078] Step 1: Select the pipe network simulation function in the pipesim software and select the simulation boundary condition as "gas reservoir parameters";

[0079] Step 2: Input the current reservoir pressure and temperature of the gas well, the current pressure and temperature at the end of the gas production pipeline, and click the Run Calculation button;

[0080] Step 3: Select standard international units based on the calculated output data to obtain the production of the gas wells after series connection.

[0081] In actual use, the determination of the output of serially connected gas wells provides strong technical support for guiding the laying of ground pipelines and the production system of drilling wells during production management after the gas wells are put into production.

[0082] In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0083] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0084] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0085] The above are only preferred embodiments of the present invention. The present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for evaluating the impact of gas well production lines connected in series on gas well production. Features: The following steps are included: Step 1: Obtain relevant parameter values ​​of the gas well to be evaluated; The relevant parameters include the measured data parameter values ​​of gas well quality, well depth structure data values, well completion data values ​​and gas production network parameter values; Step 2: Determine the gas well fluid composition; Step 3: Optimize the flow model of the gas production pipeline network related to the gas wells; Step 4: Input and model the gas well and pipeline parameters; Step 5: Determine boundary conditions; Step 6: Obtain the production of the series-connected gas wells through simulation calculation; Step 7: Use the results obtained in step 6 to guide the laying of surface pipelines and the production management and production system of intermediate well opening after the gas well is put into production.

2. A method for evaluating the effect of gas well production pipelines connected in series on gas well production as claimed in claim 1, Features: The well depth structure data obtained in step 1 include the well depth and well diameter data of the gas well; the completion data include the perforation depth, production capacity equation and gas well formation pressure data; the gas production network parameters include the actual data of the length, inner diameter, wall thickness, roughness and elevation distribution of each pipeline.

3. A method for evaluating the effect of gas well production lines connected in series on gas well production as claimed in claim 2, Features: The gas well formation pressure data used is the formation pressure data of the recent year.

4. A method for evaluating the effect of gas well production lines connected in series on gas well production as claimed in claim 1, Features: The method for determining the gas well fluid components in step 2 is to input the measured data parameters of the gas well gas quality into the pipesim software, establish a gas well output fluid component model, and obtain the components of the gas well output fluid.

5. A method for evaluating the effect of gas well production lines connected in series on gas well production as claimed in claim 1, Features: The process of the step 3 of optimizing the flow model of the gas wells in series with the relevant gas production pipeline network is as follows: S1. According to the measured data parameters of gas well quality of the gas well output fluid components obtained in step 2, select the model equations of horizontal flow and vertical flow in the simulation setting option in the pipesim software; S2. Input the corresponding height, length and inner diameter of each pipeline; S3. According to the classic model provided by pipesim software, select the model that meets the working conditions; S4. Connect the gas production pipeline according to the actual series connection method of the gas wells.

6. A method for evaluating the effect of gas well production lines connected in series on gas well production as claimed in claim 5, Features: The serial connection methods include wellhead serial connection, midway serial connection and pre-station serial connection.

7. A method for evaluating the effect of gas well production pipelines connected in series on gas well production as claimed in claim 1, Features: The detailed process of modeling in step 4 is as follows: Step 1: Input the oil casing length, artificial well bottom, packer depth, heat transfer efficiency, and soil temperature of the corresponding gas well into the gas well model in the pipesim software; Step 2: Set the IPR model of the gas well to the Jones model, input the gas reservoir pressure, gas reservoir temperature, and production capacity binomial coefficients A and B of the gas well; and select the fluid model established in step 3 as the fluid running in the formation-gas wellbore; Step 3: Set the inlet pressure and temperature of the gas gathering station at the end of the pipeline.

8. A method for evaluating the effect of gas well production lines connected in series on gas well production as claimed in claim 1, Features: The boundary condition determination in step five refers to the determination of the gas reservoir temperature, pressure and the corresponding gas gathering station inlet pressure and temperature when calculating the entire pressure system from the formation to the well and then to the gas production pipeline.

9. A method for evaluating the effect of gas well production lines connected in series on gas well production as claimed in claim 1, Features: The process of obtaining the production of the series-connected gas wells through simulation calculation in step 6 is as follows: Step 1: Select the pipe network simulation function in the pipesim software and select the simulation boundary condition as "gas reservoir parameters"; Step 2: Input the current reservoir pressure and temperature of the gas well, the current pressure and temperature at the end of the gas production pipeline, and click the Run Calculation button; Step 3: Select standard international units based on the calculated output data to obtain the production of the gas wells after series connection.

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