A method for measuring the trend of a gas well pipe based on an intelligent plunger

Abstract

The application relates to a kind of gas well pipeline trend measurement methods based on intelligent plunger, comprising: setting intelligent plunger in gas well pipeline itself movement information acquisition frequency, and recording its own movement acceleration set;Intelligent plunger itself movement speed set is set and calculated;Intelligent plunger itself movement position set is calculated;Based on the equal diameter of gas well pipeline and intelligent plunger, the position information measured by intelligent plunger in the running process of gas well pipeline represents the trend of the whole gas well pipeline, and the pipeline trend set is established;Reference coordinate system is constructed;The pipeline trend between any element in the established pipeline trend set and reference coordinate system is solved;The deviation angle of each element in movement position set deviating from positive north, positive east, vertical ground pointing to the direction of earth center is calculated;The expression of pipeline trend measurement result set is obtained.The application realizes the measurement of gas well pipeline trend along with production process.

Description

Technical Field

[0001] This invention relates to the field of gas well pipeline trend measurement technology, specifically to a gas well pipeline trend measurement method based on a smart plunger. Background Technology

[0002] With the accelerated transformation of the global energy structure, natural gas is becoming increasingly important as a clean energy source. The formation of a natural gas well mainly involves exploration, drilling, completion, commissioning, and production. Measurement of well trajectory parameters is typically conducted during the drilling process. After the initial drilling is completed, the drill bit is replaced stage by stage to drill the main wellbore. Simultaneously, the measurement-while-drilling (MWD) system at the rear of the drill bit monitors and records the well inclination angle in real time. The measured inclination angle represents the overall trend of the gas well below the surface and serves as a completion status parameter, providing a data basis for the subsequent optimization and improvement of the natural gas production process.

[0003] In general, the well completion process in drilling involves running production casing, cementing, and perforation to achieve stratified production. This process disrupts the wellbore walls formed during drilling, causing the measured pipeline path during measurement drilling to differ from the actual path. Furthermore, due to the elastic properties of metal, the centerline of the gas well pipeline does not coincide with the centerline of the wellbore walls. This means that the drilling parameters measured during drilling cannot represent the actual gas well pipeline path, and subsequent production processes do not involve re-measuring these parameters. Therefore, using drilling parameters as the gas well pipeline path parameters is unreasonable.

[0004] Furthermore, with continuous production, formation energy decreases while groundwater levels increase, leading to corresponding changes in formation geology over time. The wellbore walls, driven by these geological changes, cause the internal gas well pipeline to move. The well inclination angles monitored during drilling can only serve as initial parameters for subsequent production processes and do not reflect long-term pipeline trajectory changes. Therefore, a method for measuring gas well pipeline trajectory that accompanies the production process is urgently needed to monitor these changes throughout the entire lifecycle of natural gas production. The key parameters for gas well pipeline trajectory include the trajectory equation between any two pipeline locations and the vertical deflection angle at each location relative to the surface gas production tree.

[0005] As a crucial core component in natural gas enhancement processes, the intelligent plunger is equipped with pressure and temperature sensors that continuously record environmental parameters within the pipeline during operation, and an internal accelerometer that continuously records changes in its own motion. Based on these changes in motion parameters, the plunger's current position, the position and depth of the liquid level within the pipeline, are determined. Therefore, the intelligent plunger's own motion sensors can be used to retrieve the gas well centerline for measuring the pipeline's trajectory parameters. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention proposes a method for measuring the trajectory of gas well pipelines based on intelligent plungers.

[0007] The above-mentioned objective of this invention is achieved through the following technical solution: A method for measuring the trajectory of a gas well pipeline based on a smart plunger includes the following steps: Step 1: Set the frequency for collecting the smart plunger's own motion information in the gas well pipeline, and record the set of smart plunger's own motion acceleration at the set information collection frequency; Step 2: Assume that the acceleration of the intelligent plunger remains constant for a short period of time under the action of inertia. Based on the set of accelerations of the intelligent plunger itself obtained in Step 1, set and calculate the set of velocities of the intelligent plunger itself. Step 3: Based on the set of intelligent plunger's own motion velocities obtained in Step 2, calculate the set of intelligent plunger's own motion positions; Step 4: Based on the fact that the inner diameter of the gas well pipeline is equal to the outer diameter of the smart plunger, the position information obtained in Step 3 is measured by the smart plunger during the operation of the gas well pipeline to represent the overall trend of the gas well pipeline, and a pipeline trend set is established. Step 5: Define the point where the gas well pipeline's production tree intersects with the ground as the origin of the coordinate system, with due north as the X-axis, due east as the Y-axis, and the direction perpendicular to the ground pointing towards the Earth's center as the Z-axis, to construct a reference coordinate system; Step Six: Solve for the pipeline trend of any element in the pipeline trend set established in Step Four relative to the reference coordinate system; Step 7: Define the deviation angles of the gas well pipeline from due north, due east, and the direction perpendicular to the ground pointing towards the center of the earth. Based on the pipeline trajectory set established in Step 4, calculate the deviation angles of each element in the set of movement positions in the three directions. Step 8: Based on the pipeline trend obtained in Step 6 and the deviation angles in the three directions obtained in Step 7, obtain the set expression of the pipeline trend measurement results.

[0008] Moreover, in step one, the set of accelerations of the intelligent plunger itself is... , , where set any element Represented as The physical meaning is the acceleration components in three directions at the corresponding point, a set. The time interval between two elements is s.

[0009] Furthermore, in step two, the set of motion velocities of the intelligent plunger itself is... , , where set any element It can be represented as ,gather Any two adjacent elements and The acceleration is Then speed It can be represented as:

[0010] in, .

[0011] Furthermore, in step three, the set of the intelligent plunger's own movement positions , Then the set Any two adjacent elements and The relationship can be represented as:

[0012] in, ,gather any element It can be represented as The physical meaning is the corresponding point in three-dimensional coordinates.

[0013] Furthermore, in step four, the pipeline trend set is as follows: , ,gather any element For set Any two adjacent points and The trend between them can be specifically represented as:

[0014] in, , It can also be expressed as .

[0015] Furthermore, in step six, the north direction vector is... The vector in the due east direction is The vector perpendicular to the ground pointing towards the Earth's center is .

[0016] Furthermore, in step seven, the deviation angles of the gas well pipeline from due north, due east, and the direction perpendicular to the ground pointing towards the Earth's center are respectively... , , Then the corresponding position Three angles , , They are respectively: .

[0017] Furthermore, the set of pipeline trajectory test results in step eight is as follows: , any one of the elements It can be represented as: .

[0018] The advantages and positive effects of this invention are as follows: This invention is based on intelligent plunger equipment and kinematic laws. During the movement of the intelligent plunger in the gas well pipeline, it records its own motion information, clarifies each movement position and the deflection angle of the corresponding position relative to the vertical ground and pointing towards the center of the earth, and finally completes the gas well pipeline trend measurement work. This method realizes the measurement of gas well pipeline trend during the production process and can be well applied to the accurate monitoring of gas well pipeline trend changes throughout the entire life cycle of natural gas production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the modules involved in the operation of the intelligent plunger system; Figure 2 This is a schematic diagram of the intelligent plunger measuring the position of a gas well pipeline according to the present invention; Figure 3 This is a schematic diagram of the layout of gas well trend measurement points according to the present invention. Detailed Implementation

[0020] The structure of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that these embodiments are descriptive and not limiting.

[0021] A method for measuring the trajectory of gas well pipelines based on intelligent plungers; please refer to [link / reference]. Figures 1-3 The inventive point is that it includes the following steps: Step 1: Set the frequency of intelligent plunger motion information acquisition to [value]. Hz, and records its own motion acceleration set at the set information acquisition frequency. , where set any element It can be represented as The physical meaning is the acceleration components in three directions at the corresponding point, a set. The time interval between two elements is s.

[0022] Step 2: Obtain the set of accelerations of the intelligent plunger itself. Based on this, if the acceleration of the intelligent plunger remains constant for a short period of time due to inertia, and its own velocity set is set as... , where set any element It can be represented as ,gather Any two adjacent elements and The acceleration is Then speed It can be represented as:

[0023] in, .

[0024] Step 3: Obtain the set of motion velocities of the intelligent plunger itself. Based on this, we can obtain the set of its own motion positions. A schematic diagram of the intelligent plunger's measurement position in the pipeline is attached. Figure 2 As shown, the set Any two adjacent elements and The relationship can be represented as:

[0025] in, ,gather any element It can be represented as The physical meaning is the corresponding point in three-dimensional coordinates.

[0026] Step Four: The downhole tubing has a hollow cylindrical cross-section, while the smart plunger has a solid cylindrical cross-section. Furthermore, the inner diameter of the tubing is approximately equal to the outer diameter of the smart plunger. Therefore, the positional information measured during the smart plunger's operation in the well can be considered to represent the overall trend of the tubing. (See attached diagram.) Figure 3 As shown. Set If any line segment connecting any two points in a given set can be used as a sub-element of the pipeline path, then the pipeline path can be represented by a set. Represents a set Represented as ,gather any element For set Any two adjacent points and The trend between them can be specifically represented as:

[0027] in, , It can also be expressed as .

[0028] Step 5: Define the reference coordinate system: Set the point where the gas source tree intersects with the ground as the origin of the coordinate system, with the north direction as the X-axis, the east direction as the Y-axis, and the direction perpendicular to the ground pointing towards the Earth's center as the Z-axis.

[0029] Step Six: Set up the pipeline trend data from Step Four any element The solution is derived from the pipeline trajectory relative to the reference coordinate system, with the velocity equation shown in step two and the position equation shown in step three. The north direction vector is... The vector in the due east direction is The vector perpendicular to the ground pointing towards the Earth's center is .

[0030] Step 7: Define the deviation angles of the gas well pipeline from due north, due east, and the direction perpendicular to the ground pointing towards the Earth's center as follows: , , Then the corresponding position Three angles , , They are respectively:

[0031] Step 8: Based on Steps 6 and 7, the location... The results of pipeline route measurement can be used as a set Represented as any one of the elements It can be represented as: .

[0032] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A method for measuring the trajectory of a gas well pipeline based on a smart plunger, characterized in that, Includes the following steps: Step 1: Set the frequency of smart plunger motion information acquisition in the gas well pipeline Hz, and record the set of the intelligent plunger's own motion acceleration at the set information acquisition frequency; Step 2: Assume that the acceleration of the intelligent plunger remains constant for a short period of time under the action of inertia. Based on the set of accelerations of the intelligent plunger itself obtained in Step 1, set and calculate the set of velocities of the intelligent plunger itself. Step 3: Based on the set of intelligent plunger's own motion velocities obtained in Step 2, calculate the set of intelligent plunger's own motion positions; Step 4: Based on the fact that the inner diameter of the gas well pipeline is equal to the outer diameter of the smart plunger, the position information obtained in Step 3 is measured by the smart plunger during the operation of the gas well pipeline to represent the overall trend of the gas well pipeline, and a pipeline trend set is established. Step 5: Define the point where the gas well pipeline's production tree intersects with the ground as the origin of the coordinate system, with due north as the X-axis, due east as the Y-axis, and the direction perpendicular to the ground pointing towards the Earth's center as the Z-axis, to construct a reference coordinate system; Step Six: Solve for the pipeline trend of any element in the pipeline trend set established in Step Four relative to the reference coordinate system; Step 7: Define the deviation angles of the gas well pipeline from due north, due east, and the direction perpendicular to the ground pointing towards the center of the earth. Based on the pipeline trajectory set established in Step 4, calculate the deviation angles of each element in the set of movement positions in the three directions. Step 8: Based on the pipeline trend obtained in Step 6 and the deviation angles in the three directions obtained in Step 7, obtain the set expression of the pipeline trend measurement results; In step one, the set of accelerations of the intelligent plunger itself is: , , where set any element Represented as The physical meaning is the acceleration components in three directions at the corresponding point, a set. The time interval between two elements is s; In step two, the set of velocities of the intelligent plunger itself is: , , where set any element It can be represented as ,gather Any two adjacent elements and The acceleration is Then speed It can be represented as: in, ; In step three, the set of the intelligent plunger's own movement positions. , Then the set Any two adjacent elements and The relationship can be represented as: in, ,gather any element It can be represented as The physical meaning is the corresponding point in three-dimensional coordinates; In step four, the pipeline trend set is as follows: , ,gather any element For set Any two adjacent points and The trend between them can be specifically represented as: in, , It can also be expressed as .

2. The method for measuring the trajectory of a gas well pipeline based on a smart plunger according to claim 1, characterized in that: In step six, the north direction vector is... The vector in the due east direction is The vector perpendicular to the ground pointing towards the Earth's center is .

3. The method for measuring the trajectory of a gas well pipeline based on a smart plunger according to claim 2, characterized in that: In step seven, the deviation angles of the gas well pipeline from due north, due east, and the direction perpendicular to the ground pointing towards the Earth's center are respectively... , , Then the corresponding position Three angles , , They are respectively: 。 4. The method for measuring the trajectory of a gas well pipeline based on a smart plunger according to claim 3, characterized in that: The set of pipeline trajectory test results in step eight is as follows , any one of the elements It can be represented as: 。

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