Automatic metering method and system for steel wire bailing liquid discharge amount

Abstract

The invention discloses an automatic metering method and system for steel wire bailing liquid drainage amount, and relates to the technical field of oil and gas field downhole operation metering. The initial bailing liquid column height is determined according to the steel wire operation capacity and the detected shaft liquid level position, and the initial bailing liquid amount is calculated according to the initial bailing liquid column height; after the initial bailing liquid column height is determined, steel wire tension data in the steel wire bailing operation process are detected in real time, the weight of liquid extracted by a bailing puller and the liquid column height are calculated in real time through an automatic metering algorithm, and therefore the real-time bailing liquid amount, the single-time bailing liquid drainage efficiency and the comprehensive bailing liquid drainage efficiency are determined. The real-time liquid amount of steel wire bailing is automatically calculated by measuring the steel wire tension, the tool string lower depth, the tool string upper and lower pressure and other data, and the real-time evaluation of the steel wire bailing operation effect is achieved. Ground matching metering equipment and a storage tank are avoided while metering is completed, the operation matching cost is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole operation measurement in oil and gas fields, and in particular to an automatic measurement method and system for wireline bailing discharge volume. Background Art

[0002] During the development of oil and gas fields, wireline bailing and drainage is one of the commonly used process technologies in oil and gas well operations. This technology uses a ground winch as the power to lower the bailing and drainage pump into the wellbore through a wireline, and make reciprocating movements up and down in the oil pipe. When the pump is lifted up, the liquid on the upper part of the pump is lifted and discharged out of the wellhead, thereby reducing the back pressure of the wellbore liquid on the formation, and continuously discharging the accumulated liquid in the reservoir, thereby reducing the height of the wellbore liquid column and the bottom hole pressure, and restoring gas well production.

[0003] Wireline bailing and drainage technology has good adaptability and is effective for draining new wells and resuming production in wells with accumulated fluid. However, due to factors such as inaccurate wellbore liquid level judgment and leakage during operation, and the fact that drainage is carried out in a closed wellbore environment, when the amount of fluid discharged varies greatly or even when there is empty pumping, it is impossible to timely monitor the changes in discharge volume during each pumping process and promptly adjust the drainage plan and optimize the supporting tools. On-site judgment mainly relies on experience, and there is a lack of real-time, accurate, and efficient means of measuring the discharge volume, making it impossible to quickly and objectively evaluate the drainage situation and results.

[0004] Patent document 201910345688.X discloses a method for automatic metering during oil test swabbing operations. This method determines changes in the swabbing fluid volume through real-time automatic detection of the liquid level in a ground-based metering tank. While this method can theoretically meet on-site metering requirements, it does require the deployment of metering tanks, connection processes, and the disposal of accumulated fluid. Therefore, using ground-based tank metering cannot meet the needs of low-cost, fast operations, and is difficult to promote and apply on-site. Consequently, a method is urgently needed for real-time automatic metering of swabbing fluid volume during wireline swabbing operations without adding additional ground-based metering equipment. Summary of the Invention

[0005] The present invention aims to provide a method and system for automatically measuring the amount of liquid discharged from a wireline bailing operation. This method utilizes existing operating parameters and a metering algorithm to determine the real-time amount of liquid drawn and discharged from the wellhead, without adding additional metering equipment on the surface. This solves the problem of rapidly and cost-effectively evaluating the effectiveness of wireline bailing operations and provides a reliable basis for optimizing and adjusting process technologies. To achieve this objective, the present invention provides the following technical solutions:

[0006] The present invention provides a method for automatically measuring the amount of liquid discharged by wire bailing, the method comprising:

[0007] Determine the wellbore liquid level;

[0008] According to the wireline operation capacity and the liquid level position of the explored wellbore, the initial lifting liquid column height is determined, and the initial lifting liquid volume is calculated from the initial lifting liquid column height;

[0009] After determining the initial height of the liquid column, the wire tension data during the wire lifting operation is detected in real time. Through the automated metering algorithm, the weight of the liquid lifted by the lifting pump and the height of the liquid column are calculated in real time, thereby determining the real-time liquid lifting volume, single lifting and drainage efficiency, and comprehensive lifting and drainage efficiency.

[0010] Furthermore, the determination of the wellbore liquid level position includes:

[0011] During the lowering of the wireline fishing tool string, the wire tension is observed and recorded in real time. If the wire tension suddenly decreases, the lowering is stopped. Then, after lifting it 50m, the tool is continued to be lowered at a constant speed of 30-100m / min. If the wire tension suddenly decreases again at the position where the tension was last reduced, the position is preliminarily determined to be the liquid level height of the gas well, that is, the initial value of the wellbore liquid level position.

[0012] Furthermore, during the determination of the wellbore liquid level position, the wire tension F gs Equal to the tool string gravity F gjG , steel wire gravity F gsG , friction force F with the pipe wall gm , Gravity of the scooped liquid F ytG , liquid friction resistance F ym , back pressure force F on the upper part of the drawer sy and the pressure force F at the lower end of the drawer xy The vector sum of F gs =F gjG +F gsG +F gm +F ytG +F ym +F sy +F xy ;in,

[0013] The wire tension F gs The range of sudden changes is greater than the tool string gravity F gjG .

[0014] Furthermore, the calculation formula for the amount of the bailed liquid is:

[0015]

[0016] Where V yt is the amount of liquid lifted, ρ yt is the liquid density.

[0017] Furthermore, the wire weight F gsG The calculation formula is:

[0018] F gsG =ρ gs ×g×S gs ×H gs ;

[0019] Where, ρ gs is the density of the steel wire, g is the acceleration due to gravity, S gs is the cross-sectional area of ​​the wire, H gs Go deep for the tool string.

[0020] Furthermore, the upper back pressure force F of the drawer sy The calculation formula is:

[0021] F sy =P sy ×S gz ;

[0022] Where, P sy S is the upper back pressure of the pump, gz is the inner diameter cross-sectional area of ​​the production string.

[0023] Furthermore, the back pressure force F of the lower part of the drawer xy The calculation formula is:

[0024] F xy =P sxy ×S gz ;

[0025] Where, P sxy S is the back pressure of the lower part of the pump, gz is the inner diameter cross-sectional area of ​​the production string.

[0026] Furthermore, the calculation formula for the single dredging and drainage efficiency is as follows:

[0027]

[0028] Where η d is the efficiency of single lifting and drainage, V yt is the amount of liquid lifted, V yt0 is the initial volume of the liquid column.

[0029] Furthermore, the calculation formula of the comprehensive lifting and drainage efficiency is as follows:

[0030]

[0031] Where η is the comprehensive drainage efficiency, n is the number of drainage times for reviving a well, V yti is the amount of liquid lifted each time, V yt0i is the initial amount of liquid lifted each time, i is the number of times a well is revived and drained, and its value ranges from 1 to n.

[0032] The present invention also provides a wire bailing discharge automatic metering system, the system comprising:

[0033] a determination unit, for determining a wellbore liquid level position;

[0034] The first calculation unit is used to determine the height of the initial bailing liquid column according to the wireline operation capacity and the liquid level position of the explored wellbore, and calculate the initial bailing liquid volume based on the initial bailing liquid column height;

[0035] The second calculation unit is used to detect the wire tension data in real time during the wire lifting operation after determining the initial lifting liquid column height, and calculate the weight of the liquid lifted by the lifting pump and the height of the liquid column in real time through an automated metering algorithm, thereby determining the real-time lifting liquid volume, single lifting and drainage efficiency, and comprehensive lifting and drainage efficiency.

[0036] Technical effects and advantages of the present invention:

[0037] The present invention provides an automated method for measuring wireline bailing displacement. By measuring data such as wireline tension, tool string depth, and pressure above and below the tool string, the method automatically calculates the real-time liquid volume of the wireline bailing operation, enabling real-time evaluation of wireline bailing performance. This method eliminates the need for ground-based metering equipment and storage tanks, reducing operational costs and improving efficiency. It also provides a reliable basis for optimizing and adjusting process technologies.

[0038] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 This is an overall flow chart of an automatic measurement method for wire bailing discharge volume of the present invention;

[0041] Figure 2 This is a flow chart of a method for determining a wellbore liquid level position according to Example 1 of the present invention;

[0042] Figure 3 This is a detailed flow chart of the automated measurement method for wire bailing and drainage volume according to Example 2 of the present invention;

[0043] Figure 4 The present invention is a schematic diagram of an automatic metering system for wire bailing and liquid discharge. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0045] In order to solve the deficiencies of the prior art, the present invention discloses an automatic measurement method for wire lifting and drainage volume. Figure 1 This is a flow chart of an automatic measurement method for wire lifting and drainage volume of the present invention, as shown in FIG. Figure 1 As shown, the method includes the following steps:

[0046] Step S101: Determine the wellbore liquid level position.

[0047] Specifically, during the lowering of the wireline fishing tool string, the wire tension is observed and recorded in real time. If the wire tension suddenly decreases, the lowering is stopped. Then, after lifting it 50m, the tool is continued to be lowered at a uniform speed of 30-100m / min. If the wire tension suddenly decreases again at the position where the tension was last reduced, the position is preliminarily determined to be the liquid level height of the gas well, that is, the initial value of the wellbore liquid level position.

[0048] Step S102: Determine the submerged depth of the salvage pump (initial salvage liquid column height) based on the wireline operation capacity and the liquid level position in the explored wellbore, and calculate the initial salvage liquid volume based on the initial salvage liquid column height.

[0049] Step S103: After determining the initial height of the liquid column, the wire tension data during the wire fishing operation is detected in real time. That is, by comparing and analyzing the changes in the wire tension of the wire fishing tool string during the process of going down the well, entering the liquid surface, and lifting, the various factors affecting the wire tension are analyzed, including the gravity of the tool string, the depth of the tool string, the gravity of the wire, the friction with the pipe wall, the viscous resistance of the fluid, the flow resistance of the fluid, the weight of the fishing liquid, the pressure at the upper end of the fishing pump, the pressure at the lower end of the fishing pump, etc. Using these existing data, an automatic metering algorithm is designed to calculate in real time the weight of the liquid lifted by the fishing pump and the height of the fishing liquid column, thereby determining the real-time amount of fishing liquid.

[0050] Furthermore, when the lifting pull is lifted, the wire tension F gs Equal to the tool string gravity F gjG , steel wire gravity F gsG , friction force F with the pipe wall gm, Gravity of the scooped liquid F ytG , liquid friction resistance F ym , back pressure force F on the upper part of the drawer sy , the pressure force F at the lower end of the drawer xy The vector sum of gs =F gjG +F gsG +F gm +F ytG +F ym +F sy +F xy .

[0051] The weight of the scooped liquid F ytG =ρ yt ×V yt ,ρ yt is the liquid density, V yt is the amount of liquid lifted (volume).

[0052] Therefore, the amount of the extraction liquid Lifting liquid column height

[0053] Furthermore, the process of draining the liquid by lifting the pump in the wellbore is as follows: according to the determined liquid level position data, the pump is lowered to the predetermined initial drainage liquid column height H yz0 The position is sealed, and the drawer is lifted at a uniform speed after sealing to ensure the stability of the wire tension. The wire tension is collected in real time during the lifting process, and then the real-time lifting liquid volume V is calculated by designing an automatic measurement algorithm yt and the initial volume of the liquid column V yt0 Compare and correct the friction force F of the pipe wall gm and liquid friction resistance F ym . Make sure to calculate the amount of liquid V yt Accurate and reliable.

[0054] The steel wire gravity F gsG =ρ gs ×g×S gs ×H gs ,ρ gs is the density of the steel wire, g is the acceleration due to gravity, S gs is the cross-sectional area of ​​the wire, H gs Go deep for the tool string.

[0055] The back pressure force F on the upper part of the drawer sy =P sy ×S gz , the back pressure force F of the lower part of the drawer xy =P sxy ×S gz .P sy For the upper back pressure of the pump, Psxy Back pressure at the bottom of the pump, S gz is the inner diameter cross-sectional area of ​​the production string.

[0056] The height of the liquid column is:

[0057] When the tool string is lowered to a depth of H gs =H yt When the lifting liquid volume V is determined yt The final amount of fluid discharged from the wellbore.

[0058] The efficiency of a single lift and drainage is calculated as:

[0059] The comprehensive lifting and drainage efficiency is calculated as: n is the number of times a well is revived and drained, V yti is the amount of liquid lifted each time, V yt0i is the initial amount of liquid lifted each time, i is the number of times a well is revived and drained, and its value ranges from 1 to n.

[0060] Example 1:

[0061] Embodiment 1 of the present invention provides a method for determining the position of the liquid level in a wellbore. Figure 2 As shown, the following steps are included:

[0062] During the wireline fishing operation, each time the tool string is lowered, when it is close to the estimated liquid level, the tool string is lowered at a uniform speed to ensure that the tool string is under stable force. The wire tension range is recorded. If the wire tension suddenly decreases and then gradually increases, it will not exceed the tension before the decrease. Then stop lowering the tool string, lift the tool string 50m, and lower the tool string again at a uniform speed. If the wire tension also suddenly decreases at the original wire tension reduction position, and the tool string is continued to be lowered without encountering any resistance, it is preliminarily determined that the tension reduction position is the wellbore liquid level position. Then continue to lower the tool string to the initial liquid level position and stop 100m below the initial liquid level position. Compare the wellhead oil pressure and the back pressure on the upper part of the pump. If the wellhead oil pressure F yy With the upper part of the pump back pressure F sy If the liquid level is equal, the tool string is lowered and the above operation is repeated. sy -Oil pressure F yy =1±0.1MPa, the initially determined liquid level position is considered to be the true liquid level position in the wellbore.

[0063] During the liquid level judgment process, the wire tension F gs Equal to the tool string gravity F gjG , steel wire gravity F gsG , friction force F with the pipe wall gm , Gravity of the scooped liquid F ytG, liquid friction resistance F ym , back pressure force F on the upper part of the drawer sy , the pressure force F at the lower end of the drawer xy The vector sum of gs =F gjG +F gsG +F gm +F ytG +F ym +F sy +F xy Wire tension F gs The range of sudden changes should be greater than the tool string gravity F gjG .

[0064] Example 2:

[0065] Example 2 of the present invention provides a method for automatically measuring the amount of liquid discharged by wire lifting, such as Figure 3 As shown, the method includes the following steps:

[0066] After determining the actual liquid level position data of the wellbore before each salvage operation through Example 1, the safe salvage liquid level height can be determined according to the lifting capacity of the wireline salvage equipment. The salvage puller is lowered to the corresponding depth position, and then the tool string is lifted up at a constant speed of 50m. The wireline tension data is recorded. Using the known tool string, wireline gravity, the back pressure force at the upper and lower ends of the puller, and the force generated by the wellhead oil and casing pressure, the friction resistance between the wire and the tool string and the pipe wall and the liquid friction resistance during the tool string lifting is estimated, and the friction force F of the pipe wall is corrected. gm and liquid friction resistance F ym , providing a basis for setting the friction resistance during lifting operations, ensuring the calculation of the real-time lifting liquid volume V yt Accurate and reliable.

[0067] Then, during the tool string lifting operation, the weight of the lifting liquid is calculated based on the vector equivalent relationship of the real-time tension of the steel wire, the gravity of the tool string, the gravity of the steel wire, the friction between the steel wire and the tool string and the pipe wall, the gravity of the lifting liquid, the liquid friction resistance, the back pressure force of the upper part of the pump, the pressure force of the lower end of the pump and the wellhead oil pressure force, and then the real-time lifting liquid volume is calculated through the designed algorithm.

[0068] Specifically: Wire tension F gs Equal to the tool string gravity F gjG , steel wire gravity F gsG , friction force F with the pipe wall gm , Gravity of the scooped liquid F ytG , liquid friction resistance F ym , back pressure force F on the upper part of the drawer sy , the pressure force F at the lower end of the drawer xy The vector sum of . That is, F gs =FgjG +F gsG +F gm +F ytG +F ym +F sy +F xy .

[0069] The weight of the scooped liquid F ytG =ρ yt ×V yt ,ρ yt is the liquid density, V yt is the amount of liquid lifted (volume).

[0070] Therefore, the amount of the extraction liquid Lifting liquid column height

[0071] The steel wire gravity F gsG =ρ gs ×g×S gs ×H gs ,ρ gs is the density of the steel wire, g is the acceleration due to gravity, S gs is the cross-sectional area of ​​the wire, H gs Go deep for the tool string.

[0072] The back pressure force F on the upper part of the drawer sy =P sy ×S gz , the back pressure force F of the lower part of the drawer xy =P sxy ×S gz .P sy For the upper back pressure of the pump, P sxy Back pressure at the bottom of the pump, S gz is the inner diameter cross-sectional area of ​​the production string,

[0073] The height of the liquid column is:

[0074] When the tool string is lowered to a depth of H gs =H yt When the lifting liquid volume V is determined yt0 The final amount of fluid discharged from the wellbore is then used to calculate the bailing efficiency by comparing the current bailing amount to the initial bailing amount.

[0075] Method for calculating the efficiency of single lifting and drainage:

[0076] In order to further detect the efficiency and leakage of the bailing operation, the following formula is used to perform the difference processing on the two adjacent bailing liquid volumes: V yt1 -V yt2 =V C, if V C If a significant increase occurs, it indicates that the leakage at the corresponding operating depth has intensified. If the leakage exceeds the set value, an automatic alarm will be triggered to remind the operator to check the operating conditions and adjust the operating parameters in a timely manner to reduce the leakage.

[0077] In addition, the sum of the liquid volume discharged at each final dredging The sum of the initial lifting liquid volume The ratio can be used to calculate the comprehensive drainage efficiency of the well during the operation and evaluate the overall process effect of the wireline operation.

[0078] Specific comprehensive lifting and drainage efficiency: n is the number of times a well is revived and drained.

[0079] Based on the same concept of the present invention, the present invention also discloses an automatic metering system for wire lifting and drainage volume. Figure 4 Schematic diagram of an automatic metering system for wire lifting and drainage of the present invention, as shown in FIG. Figure 4 As shown, the system includes:

[0080] The determination unit 201 is used to determine the position of the liquid level in the wellbore; the first calculation unit 202 is used to determine the initial height of the liquid column based on the wireline operation capacity and the liquid level position of the explored wellbore, and calculate the initial liquid volume from the initial liquid column height; the second calculation unit 203 is used to detect the wireline tension data during the wireline lifting operation in real time after determining the initial liquid column height, and calculate the weight of the liquid lifted by the lifting pump and the height of the liquid column in real time through an automated metering algorithm, thereby determining the real-time liquid volume, the single lifting and drainage efficiency, and the comprehensive lifting and drainage efficiency.

[0081] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for automatically measuring the amount of liquid discharged by wire bailing, characterized in that: The method comprises: Determine the wellbore liquid level; According to the wireline operation capacity and the liquid level position of the explored wellbore, the initial lifting liquid column height is determined, and the initial lifting liquid volume is calculated from the initial lifting liquid column height; After determining the initial height of the liquid column, the wire tension data during the wire lifting operation is detected in real time. Through the automated metering algorithm, the weight of the liquid lifted by the lifting pump and the height of the liquid column are calculated in real time, thereby determining the real-time liquid lifting volume, single lifting and drainage efficiency, and comprehensive lifting and drainage efficiency.

2. The method for automatically measuring the amount of liquid discharged by wire bailing according to claim 1, characterized in that: The determining of the wellbore liquid level position includes: During the lowering of the wireline fishing tool string, the wire tension is observed and recorded in real time. If the wire tension suddenly decreases, the lowering is stopped. Then, after lifting it 50m, the tool is continued to be lowered at a constant speed of 30-100m / min. If the wire tension suddenly decreases again at the position where the tension was last reduced, the position is preliminarily determined to be the liquid level height of the gas well, that is, the initial value of the wellbore liquid level position.

3. The method for automatically measuring the amount of liquid discharged by wire bailing according to claim 1, characterized in that: During the determination of the wellbore liquid level position, the wire tension F gs Equal to the tool string gravity F gjG , steel wire gravity F gsG , friction force F with the pipe wall gm , Gravity of the scooped liquid F ytG , liquid friction resistance F ym , back pressure force F on the upper part of the drawer sy and the pressure force F at the lower end of the drawer xy The vector sum of F gs =F gjG +F gsG +F gm +F ytG +F ym +F sy +F xy ;in, The wire tension F gs The range of sudden changes is greater than the tool string gravity F gjG .

4. The method for automatically measuring the amount of liquid discharged by wire bailing according to claim 3, wherein: The calculation formula for the amount of the bailed liquid is: Where V yt is the amount of liquid lifted, ρ yt is the liquid density.

5. The method for automatically measuring the amount of liquid discharged by wire bailing according to claim 4, characterized in that: Wire gravity F gsG The calculation formula is: F gsG =ρ gs ×g×S gs ×H gs ; Where, ρ gs is the density of the steel wire, g is the acceleration due to gravity, S gs is the cross-sectional area of ​​the wire, H gs Go deep for the tool string.

6. The method for automatically measuring the amount of liquid discharged by wire bailing according to claim 4, characterized in that: The back pressure force F on the upper part of the drawer sy The calculation formula is: F sy =P sy ×S gz ; Where, P sy S is the upper back pressure of the pump, gz is the inner diameter cross-sectional area of ​​the production string.

7. The method for automatically measuring the amount of liquid discharged by wire bailing according to claim 4, characterized in that: The back pressure force F of the lower part of the drawer xy The calculation formula is: F xy =P sxy ×S gz ; Where, P sxy S is the back pressure of the lower part of the pump, gz is the inner diameter cross-sectional area of ​​the production string.

8. The method for automatically measuring the amount of liquid discharged by wire bailing according to claim 1, characterized in that: The calculation formula of the single lifting and drainage efficiency is as follows: Where η d is the efficiency of single lifting and drainage, V yt is the amount of liquid lifted, V yt0 is the initial volume of the liquid column.

9. The method for automatically measuring the amount of liquid discharged by wire bailing according to claim 1, characterized in that: The calculation formula of the comprehensive lifting and drainage efficiency is as follows: Where η is the comprehensive drainage efficiency, n is the number of drainage times for reviving a well, V yti is the amount of liquid lifted each time, V yt0i is the initial amount of liquid lifted each time, i is the number of times a well is revived and drained, and its value ranges from 1 to n.

10. An automatic metering system for wire bailing discharge volume, characterized in that: The system comprises: a determination unit, for determining a wellbore liquid level position; The first calculation unit is used to determine the height of the initial bailing liquid column according to the wireline operation capacity and the liquid level position of the explored wellbore, and calculate the initial bailing liquid volume based on the initial bailing liquid column height; The second calculation unit is used to detect the wire tension data in real time during the wire lifting operation after determining the initial lifting liquid column height, and calculate the weight of the liquid lifted by the lifting pump and the height of the liquid column in real time through an automated metering algorithm, thereby determining the real-time lifting liquid volume, single lifting and drainage efficiency, and comprehensive lifting and drainage efficiency.

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