A staged fracturing tracer productivity analysis and testing method

Abstract

The present invention belongs to the technical field of petroleum extraction, and specifically relates to a staged fracturing tracer productivity analysis and testing method, comprising the following steps: S1: calculating a tracer dosage and an injection rate according to staged fracturing data; S2: preparing a tracer solution of a specified concentration and adding the solution to a dosing device; S3: adding the tracer to different layers during the fracturing process through the dosing device; S4: continuously sampling from a sampling port of a flowback fluid pipeline during fracturing fluid flowback; S5: processing the collected samples and then testing the samples to obtain a tracer concentration curve; and S6: comprehensively analyzing and processing the obtained data and curves, comprehensively interpreting and evaluating them, and providing relevant analysis results. The present invention has a simple structure and can simultaneously stir the tracer liquid in a box in both circumferential and vertical directions, thereby promoting mutual contact of the tracer liquid in the box and ensuring uniform mixing, without stratification or precipitation.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum extraction, and in particular relates to a staged fracturing tracer productivity analysis and testing method. Background Art

[0002] Tracer detection technology involves injecting a tracer into an injection well, then sampling surrounding production wells according to specific sampling regulations, monitoring their production, analyzing the samples, and deriving a tracer production curve. This curve is then fitted to reflect the connectivity between oil and water wells during waterflooding development, and to understand the direction of injected water propulsion, displacement velocity, swept area, reservoir heterogeneity, and residual oil saturation distribution, thereby guiding oil well design and adjustments in the later stages of oilfield development.

[0003] When using existing tracer injection devices for staged fracturing wells, the tracers are mostly pre-mixed and then simply pumped into the staged fracturing well using a pump. During the injection process, the tracer in the container cannot be stirred and mixed. When the tracer injection amount is large and the injection time is relatively long, the tracer in the container is prone to stratification and precipitation, resulting in the initial concentration of the injected tracer not meeting the standard or the tracer injection being uneven, which reduces the effectiveness of the injected tracer and affects the accuracy and precision of subsequent detection, as well as the final analysis results. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the tracer liquid in the box is stirred simultaneously in the circumferential direction and the vertical direction to promote the mutual contact of the tracer liquid in the box and ensure its uniform mixing without stratification and precipitation. The present invention proposes a staged fracturing tracer productivity analysis test method.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a staged fracturing tracer productivity analysis and testing method according to the present invention comprises the following steps:

[0006] S1: Calculate the tracer dosage and injection rate based on staged fracturing data, such as the number of stages and the fluid volume per stage. The formula for calculating the tracer dosage is: A=1000*μ*MDL*Vp, where: A is the tracer dosage (kg), μ is the assurance factor (500), MDL is the instrument's minimum detection limit (10-9 g / mL), and Vp is the fluid volume per stage (m3). The formula for calculating the tracer injection rate is: Q=A / t, where: Q is the injection pump flow rate (mL / min), A is the tracer solution volume (mL), and t is the engineering fluid injection time (min).

[0007] S2: prepare a tracer solution of a specified concentration and add the tracer solution to the delivery device;

[0008] S3: Tracers are added to different layers during the fracturing process through a dosing device. The tracers are dosed using a high-precision constant-flow pump. The tracer injection time is from the start to the end of sand addition, and oil-phase tracers and water-phase tracers are added simultaneously. During the tracer addition process, the injection rate is adjusted proportionally with the fracturing fluid injection rate to ensure uniform tracer addition.

[0009] S4: During the fracturing fluid flowback period, continuous sampling is carried out from the sampling port of the flowback fluid pipeline. The sampling frequency is determined by the flowback fluid volume. In principle, a sample is taken every 30-50m3 of flowback fluid. At the same time, the sampling period is terminated or extended based on the test results. The initial sampling period is expected to be 2-3 months.

[0010] S5: After processing the collected samples, the samples are detected using an inductively coupled plasma mass spectrometer to obtain a tracer concentration curve. During sample processing, the oil-water samples are filtered, and the collected filtrate must be clear and transparent. At the same time, samples with low water content or in the form of oil-in-water are first dehydrated.

[0011] S6: Comprehensively analyze and process the obtained data and curves, comprehensively interpret and evaluate them, and provide relevant analysis results;

[0012] The delivery device includes a box body, an inlet pipe and an injection pipe are installed on the box body, a high-precision constant flow pump is installed on the injection pipe, a rotating shaft is installed in the box body, the rotating shaft is driven by a motor, a sleeve shaft is sleeved on the rotating shaft, the rotating shaft and the sleeve shaft are connected by a spline, and a dial plate is installed on the sleeve shaft;

[0013] A mounting plate is installed at the upper end of the sleeve shaft, a spring is installed on the mounting plate, the other end of the spring is connected to the top surface of the box body, a mounting seat is installed on the bottom surface of the box body, a protrusion is provided on the mounting seat, and a stop block is installed at the lower end of the sleeve shaft, and the stop block and the protrusion cooperate with each other.

[0014] Preferably, the dial plate consists of two parts: a horizontal part and an inclined part. The cross section of the dial plate is in a "Z" shape. The horizontal part is parallel to the horizontal plane, and there is an angle between the inclined part and the horizontal part.

[0015] Preferably, the inclined portion is provided with evenly distributed mesh holes.

[0016] Preferably, the end surface of one end of the protrusion is rounded, and the end surface of the other end of the protrusion is perpendicular to the upper surface of the mounting seat.

[0017] Preferably, a guide surface is provided at the edge of the bottom surface inside the box body, the bottom surface inside the box body is in an arc shape, the injection pipe is connected to the middle position of the bottom surface inside the box body, the mounting seat is located directly above the opening of the injection pipe in the box body, and the inlet pipe is installed on the top cover of the box body.

[0018] Preferably, a connecting shaft is installed at the lower end of the rotating shaft, and a blade is installed on the connecting shaft. The blade is located between the mounting seat and the opening of the injection pipe on the box body.

[0019] Preferably, the blades include upper blades and lower blades, the upper blades are fixedly mounted on the connecting shaft, and the lower blades are rotatably mounted on the connecting shaft. The upper blades are located above the opening of the injection pipe on the box body, and the lower blades are located inside the opening of the injection pipe on the box body. The rotation directions of the upper blades are opposite to those of the lower blades.

[0020] Preferably, an isolation coating is provided inside the delivery device and on the surface of each component, and the isolation coating has good hydrophobic and oleophobic properties.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The present invention discloses a staged fracturing tracer productivity analysis and testing method. By providing a rotating shaft, a sleeve shaft, a mounting plate, a spring, a mounting seat, a protrusion, a block, and a paddle, the tracer liquid in the box is simultaneously stirred in the circumferential and vertical directions, promoting mutual movement between the tracer liquids, thereby ensuring that the tracer liquids always maintain a uniform mixing state and avoiding affecting subsequent detection and analysis results.

[0023] 2. The present invention discloses a staged fracturing tracer productivity analysis test method. By providing a guide surface, a paddle, a horizontal portion, an inclined portion, a connecting shaft, an upper blade, and a lower blade, the tracer liquid is further agitated and guided, thereby reducing potential dead spots during the movement of the tracer liquid and ensuring that the tracer liquid remains uniformly mixed, thereby avoiding affecting subsequent detection and analysis results. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 It is a method step diagram of the analysis and testing method of the present invention;

[0026] Figure 2 This is a front view of the delivery device of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the delivery device in the present invention;

[0028] Figure 4It is a structural schematic diagram of the paddle in the dispensing device of the present invention;

[0029] Figure 5 yes Figure 3 A partial enlarged view of the middle part;

[0030] In the figure: box body 1, inlet pipe 11, injection pipe 12, high-precision constant flow pump 13, motor 14, guide surface 15, rotating shaft 2, sleeve shaft 3, mounting plate 31, spring 32, mounting seat 33, protrusion 331, block 332, dial plate 4, horizontal part 41, inclined part 42, connecting shaft 5, upper blade 51, lower blade 52. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0032] like Figures 1 to 5 As shown, the present invention provides a staged fracturing tracer productivity analysis and testing method, the method comprising the following steps:

[0033] S1: Calculate the tracer dosage and injection rate based on staged fracturing data, such as the number of stages and the fluid volume per stage. The formula for calculating the tracer dosage is: A=1000*μ*MDL*Vp, where: A is the tracer dosage (kg), μ is the assurance factor (500), MDL is the instrument's minimum detection limit (10-9 g / mL), and Vp is the fluid volume per stage (m3). The formula for calculating the tracer injection rate is: Q=A / t, where: Q is the injection pump flow rate (mL / min), A is the tracer solution volume (mL), and t is the engineering fluid injection time (min).

[0034] S2: prepare a tracer solution of a specified concentration and add the tracer solution to the delivery device;

[0035] S3: The tracer is added to different layers during the fracturing process through the dosing device. The tracer is dosed by a high-precision constant flow pump 13. The tracer injection time is from the start to the end of sand addition. The oil phase tracer and the water phase tracer are added simultaneously. During the tracer addition process, the injection rate of the tracer is adjusted proportionally with the fracturing fluid injection rate to ensure uniform tracer addition.

[0036] S4: During the fracturing fluid flowback period, continuous sampling is carried out from the sampling port of the flowback fluid pipeline. The sampling frequency is determined by the flowback fluid volume. In principle, a sample is taken every 30-50m3 of flowback fluid. At the same time, the sampling period is terminated or extended based on the test results. The initial sampling period is expected to be 2-3 months.

[0037] S5: After processing the collected samples, the samples are detected using an inductively coupled plasma mass spectrometer to obtain a tracer concentration curve. During sample processing, the oil-water samples are filtered, and the collected filtrate must be clear and transparent. At the same time, samples with low water content or in the form of oil-in-water are first dehydrated.

[0038] S6: Comprehensively analyze and process the obtained data and curves, comprehensively interpret and evaluate them, and provide relevant analysis results;

[0039] The delivery device includes a box body 1, on which an inlet pipe 11 and an injection pipe 12 are installed. A high-precision constant flow pump 13 is installed on the injection pipe 12. A rotating shaft 2 is installed in the box body 1, and the rotating shaft 2 is driven by a motor 14. A sleeve shaft 3 is sleeved on the rotating shaft 2. The rotating shaft 2 and the sleeve shaft 3 are connected by a spline, and a dial plate 4 is installed on the sleeve shaft 3.

[0040] A mounting plate 31 is mounted on the upper end of the sleeve shaft 3, a spring 32 is mounted on the mounting plate 31, the other end of the spring 32 is connected to the top surface of the box body 1, a mounting seat 33 is mounted on the bottom surface of the box body 1, a protrusion 331 is provided on the mounting seat 33, and a stopper 332 is mounted on the lower end of the sleeve shaft 3, and the stopper 332 and the protrusion 331 cooperate with each other;

[0041] During the analysis and testing process, the staff puts the prepared tracer solution into a container, and then adds the tracer solution from the inlet pipe 11 to the dosing device through a liquid pump. After that, the motor 14 is started by the controller installed on the dosing device, thereby driving the rotating shaft 2 and the sleeve shaft 3 to rotate, so that the dial plate 4 stirs the tracer solution added to the box 1 to keep the tracer solution evenly mixed, thereby avoiding stratification and precipitation of the tracer solution during long-term operation, resulting in uneven tracer injection and affecting subsequent detection and analysis results. At the same time, after the tracer solution is added to the dosing device, during the fracturing process, the high-precision constant flow pump 13 accurately extracts the tracer solution that is stirred and kept evenly mixed in the box 1 and injects it into the staged fracturing well to complete the tracer injection process. Afterwards, when the fracturing fluid is returned, the return fluid is sampled and tested to obtain a tracer concentration curve, and the relevant data and the concentration curve are comprehensively interpreted and evaluated to provide analysis results.

[0042] At the same time, since the rotating shaft 2 and the sleeve shaft 3 are connected by a spline, under the action of the spring 32, the lower end of the sleeve shaft 3 is tightly attached to the mounting seat 33. Therefore, when the motor 14 drives the rotating shaft 2 and the sleeve shaft 3 to rotate, the stopper 332 on the sleeve shaft 3 will periodically contact and separate from the protrusion 331 on the mounting shaft, thereby causing the sleeve shaft 3 to reciprocate on the rotating shaft 2. During this process, the paddle 4 on the sleeve shaft 3 will also move up and down, thereby further stirring the tracer in the box 1, reducing the four corners that may exist when the paddle 4 rotates in a circle to stir the tracer in the box 1, improving the ability to keep the tracer mixed evenly, and avoiding the initial concentration of the tracer not meeting the standard or uneven dosage, which affects the subsequent detection and analysis results.

[0043] As an embodiment of the present invention, the dial plate 4 is composed of a horizontal portion 41 and an inclined portion 42. The cross section of the dial plate 4 is Z-shaped. The horizontal portion 41 is parallel to the horizontal plane, and an angle is formed between the inclined portion 42 and the horizontal portion 41.

[0044] Since the dial plate 4 includes a horizontal portion 41 and an inclined portion 42, when the dial plate 4 rotates in a circle, the inclined portion 42 on the dial plate 4 stirs the tracer liquid in the box 1, promoting the movement of the tracer liquid in the box 1. At this time, the tracer solution in the box 1 may have some dead corners when being stirred. The tracer solution in this area may be unevenly mixed, precipitated, or stratified, which may affect the accuracy and correctness of subsequent detection and analysis results. At the same time, when the dial plate 4 is affected by the protrusion 331 and the stopper 332 and has an up and down reciprocating motion, The horizontal portion 41 on the dial plate 4 further stirs the tracer liquid in the box 1, causing the tracer liquid in the box 1 to move up and down in addition to the circular motion. This allows the tracer liquid in the box 1 to be fully stirred by the circular and up and down motions, avoiding or minimizing dead angles in the movement of the tracer liquid in the box 1. This ensures that the tracer solution added to the dosing device remains in motion during dosing, ensuring that the initial concentration of the dosing tracer meets the standard and is evenly distributed, thereby avoiding affecting subsequent detection and analysis results.

[0045] At the same time, by providing the horizontal portion 41 and the inclined portion 42 , the paddle 4 can fully paddle the tracer solution in the circumferential and vertical directions, and ensure that the stirring effects of the two parts are relatively good, thereby eliminating the need to provide paddles 4 of various shapes and positions.

[0046] As an embodiment of the present invention, the inclined portion 42 is provided with evenly distributed mesh holes;

[0047] The mesh holes ensure that the tracer solutions are mixed as much as possible during the rotation and up and down movement of the dial plate 4, thereby maintaining a uniform mixing state. At the same time, the mesh holes reduce the force exerted by the dial plate 4 on the tracer solution during the rotation process, thereby preventing the formation of vortices in the tracer solution in the box 1, which would cause the tracer solution to splash randomly inside the box 1.

[0048] As an embodiment of the present invention, the end surface of one end of the protrusion 331 is rounded, and the end surface of the other end of the protrusion 331 is perpendicular to the upper surface of the mounting seat 33;

[0049] Due to the cooperation between the protrusion 331 and the stopper 332, when the stopper 332 moves from one end of the rounded corner of the protrusion 331 and passes over the other end, the stopper 332 will first gradually rise, then move along the upper surface of the protrusion 331, and finally the stopper 332 will suddenly and quickly fall from the upper surface of the protrusion 331 and contact the surface of the mounting seat 33, so that the sleeve plate can drive the dial plate 4 to rise relatively slowly and move downward relatively quickly, thereby reducing the possibility of the dial plate 4 driving the tracer solution to splash upward in the box 1, and causing the dial plate 4 to produce a downward impact on the tracer solution, so as to generate turbulence in the tracer solution in the box 1 through the impact, or increase the amount of turbulence, thereby reducing the dead angle of the tracer solution movement in the box 1, and improving the possibility of the tracer solution moving in the box 1 and maintaining uniform mixing, thereby ensuring the accuracy and correctness of subsequent detection and analysis results.

[0050] As an embodiment of the present invention, a guide surface 15 is provided at the edge of the bottom surface of the box body 1. The bottom surface of the box body 1 is in an arc shape. The injection pipe 12 is connected to the middle position of the bottom surface of the box body 1. The mounting seat 33 is located directly above the opening of the injection pipe 12 in the box body 1. The inlet pipe 11 is installed on the top cover of the box body 1.

[0051] A guide surface 15 is provided at the edge of the bottom surface of the box body 1, which facilitates the tracer solution in the box body 1 to be extracted from the injection pipe 12 by the high-precision constant flow pump 13 and injected into the staged fracturing well. At the same time, the guide surface 15 is provided to make the bottom surface of the box body 1 have an arc shape. The arc shape guides the flow of the tracer liquid when the dial plate 4 stirs the tracer liquid, so that the tracer liquid can flow smoothly, reducing the situation where the liquid flow speed in the corners and angles in the box body 1 is slowed down or even dead corners are formed, further ensuring that the tracer solution maintains a uniform mixing state until it is extracted and injected into the staged fracturing well.

[0052] As an embodiment of the present invention, a connecting shaft 5 is installed at the lower end of the rotating shaft 2, and a blade is installed on the connecting shaft 5. The blade is located between the mounting seat 33 and the opening of the injection pipe 12 on the box body 1;

[0053] When the motor 14 drives the rotating shaft 2 to rotate, the connecting shaft 5 and the blades on the connecting shaft 5 will also rotate synchronously, so that the tracer solution between the mounting seat 33 and the opening of the injection tube 12 on the housing 1 is stirred, avoiding a dead angle below the mounting seat 33. At the same time, the connecting shaft 5 and the blades rotate at the opening of the injection tube 12 on the housing 1, and also perform a final stirring on the tracer solution, so that the tracer solution is still stirred at the last moment before being discharged from the injection tube 12, so that it remains in a uniformly mixed state. At the same time, it can also stir and break up any particles that may have settled to the bottom or clumps that have accumulated at the bottom during the stirring process, so as to maintain the tracer solution in a uniformly mixed state as much as possible, thereby improving the accuracy of subsequent detection and analysis.

[0054] As an embodiment of the present invention, the blade includes an upper blade 51 and a lower blade 52, wherein the upper blade 51 is fixedly mounted on the connecting shaft 5, and the lower blade 52 is rotatably mounted on the connecting shaft 5. The upper blade 51 is located above the opening of the injection pipe 12 on the box body 1, and the lower blade 52 is located inside the opening of the injection pipe 12 on the box body 1. The rotation directions of the upper blade 51 and the lower blade 52 are opposite;

[0055] When the tracer solution is not extracted and discharged by the high-precision constant-flow pump 13, since the lower blade 52 is located in the opening of the injection pipe 12 on the housing 1, the lower blade 52 is hardly affected by the tracer liquid driven by the upper blade 51. Therefore, at this time, only the upper blade 51 rotates alone to stir and push the tracer solution below the mounting seat 33, thereby promoting the tracer solution to be kept uniformly mixed. At the same time, when the tracer solution is extracted and discharged by the high-precision constant-flow pump 13, liquid will flow in the opening of the injection pipe 12 on the housing 1. At this time, the lower blade 52 will be affected by the flowing liquid and rotate. Combined with the influence of the rotation of the upper blade 51 on the liquid flow, the tracer solution between the upper blade 51 and the lower blade 52 and the nearby area will be fully stirred and mixed, thereby ensuring that the tracer solution is mixed as uniformly as possible and ensuring the accuracy of subsequent detection and analysis.

[0056] As an embodiment of the present invention, an isolation coating is provided inside the delivery device and on the surface of each component, and the isolation coating has good hydrophobic and oleophobic properties;

[0057] By setting up an isolation coating, the tracer solution residue in the delivery device is reduced, and the cleaning process when the delivery device is subsequently used is facilitated, thereby preventing the residual tracer from interfering with the subsequent detection and analysis process and affecting its accuracy. At the same time, by reducing the adhesion and residue of the tracer through the isolation coating, the waste of the tracer can also be reduced.

[0058] The specific workflow is as follows:

[0059] During the analysis and testing process, the staff placed the prepared tracer solution in a container, and then added the tracer solution from the inlet pipe 11 to the dosing device through a liquid pump. After that, the motor 14 was started by the controller installed on the dosing device, thereby driving the rotating shaft 2 and the sleeve shaft 3 to rotate, so that the dial plate 4 stirred the tracer solution added to the box 1. At the same time, after the tracer solution was added to the dosing device, during the fracturing process, the high-precision constant flow pump 13 accurately extracted the stirred and uniformly mixed tracer solution in the box 1 and injected it into the staged fracturing well, completing the tracer injection process. Afterwards, when the fracturing fluid was returned, the return fluid was sampled and tested to obtain a tracer concentration curve. The relevant data and the concentration curve were comprehensively interpreted and evaluated to provide the analysis results.

[0060] At the same time, since the rotating shaft 2 and the sleeve shaft 3 are connected by a spline, the lower end of the sleeve shaft 3 is tightly attached to the mounting seat 33 under the action of the spring 32. Therefore, when the motor 14 drives the rotating shaft 2 and the sleeve shaft 3 to rotate, the stopper 332 on the sleeve shaft 3 will periodically contact and separate from the protrusion 331 on the mounting shaft, thereby causing the sleeve shaft 3 to reciprocate on the rotating shaft 2. During this process, the paddle 4 on the sleeve shaft 3 will also move up and down, thereby further stirring the tracer in the box 1.

[0061] Since the paddle plate 4 includes a horizontal portion 41 and an inclined portion 42, when the paddle plate 4 rotates in a circular motion, the inclined portion 42 on the paddle plate 4 stirs the tracer liquid in the box 1. At the same time, when the paddle plate 4 is acted upon by the protrusion 331 and the stopper 332 and reciprocates up and down, the horizontal portion 41 on the paddle plate 4 further stirs the tracer liquid in the box 1, causing the tracer liquid in the box 1 to move up and down in addition to the circular motion. This allows the tracer liquid in the box 1 to be fully stirred by the circular and up and down motions.

[0062] The mesh holes allow the tracer solutions to mix with each other as much as possible during the rotation and up and down movement of the dial plate 4, thereby maintaining a uniform mixing state.

[0063] Due to the cooperation between the protrusion 331 and the stopper 332, when the stopper 332 moves from one end of the rounded corner of the protrusion 331 and passes over the other end, the stopper 332 will first gradually rise, then move along the upper surface of the protrusion 331, and finally the stopper 332 will suddenly and quickly fall from the upper surface of the protrusion 331 and contact the surface of the mounting seat 33, so that the sleeve plate can drive the shift plate 4 to rise relatively slowly and move downward relatively quickly;

[0064] By providing the guide surface 15, the bottom surface of the box body 1 is formed into an arc shape. The arc shape guides the flow of the tracer liquid when the paddle 4 stirs the tracer liquid, so that the tracer liquid can flow smoothly, thereby reducing the situation where the liquid flow speed is slowed down or even dead corners are formed in the corners and included angles of the box body 1.

[0065] When the motor 14 drives the rotating shaft 2 to rotate, the connecting shaft 5 and the blades on the connecting shaft 5 also rotate synchronously, thereby stirring the tracer solution between the mounting seat 33 and the opening of the injection tube 12 on the housing 1;

[0066] When the tracer solution is not being pumped out by the high-precision constant-flow pump 13, since the lower blade 52 is located in the opening of the injection pipe 12 on the housing 1, the lower blade 52 is hardly affected by the tracer liquid driven by the upper blade 51. Therefore, at this time, only the upper blade 51 rotates alone to stir and push the tracer solution below the mounting seat 33. At the same time, when the tracer solution is being pumped out by the high-precision constant-flow pump 13, liquid will flow in the opening of the injection pipe 12 on the housing 1. At this time, the lower blade 52 will be affected by the flowing liquid and rotate. Combined with the effect of the rotation of the upper blade 51 on the liquid flow, the tracer solution between the upper blade 51 and the lower blade 52 and the surrounding area will be fully stirred and mixed.

[0067] By providing an isolation coating, the tracer solution residue in the delivery device is reduced, and the cleaning process of the subsequent delivery device when it is used again is facilitated.

[0068] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A staged fracturing tracer productivity analysis and testing method, characterized by: The method comprises the following steps: S1: Calculate tracer dosage and tracer injection rate based on staged fracturing data; S2: prepare a tracer solution of a specified concentration and add the tracer solution to the delivery device; S3: adding tracers to different intervals during the fracturing process through the delivery device; S4: During the fracturing fluid flowback period, continuous sampling is performed from the sampling port of the flowback fluid pipeline; S5: After processing the collected samples, the samples are detected using an inductively coupled plasma mass spectrometer to obtain a tracer concentration curve; S6: Comprehensively analyze and process the obtained data and curves, comprehensively interpret and evaluate them, and provide relevant analysis results; The delivery device comprises a box (1), an inlet pipe (11) and an injection pipe (12) are installed on the box (1), a high-precision constant flow pump (13) is installed on the injection pipe (12), a rotating shaft (2) is installed in the box (1), the rotating shaft (2) is driven by a motor (14), a sleeve shaft (3) is sleeved on the rotating shaft (2), the rotating shaft (2) and the sleeve shaft (3) are connected by a spline, and a dial plate (4) is installed on the sleeve shaft (3); The upper end of the sleeve shaft (3) is mounted with a mounting plate (31), the mounting plate (31) is mounted with a spring (32), the other end of the spring (32) is connected to the top surface of the box body (1), the bottom surface of the box body (1) is mounted with a mounting seat (33), the mounting seat (33) is provided with a protrusion (331), and the lower end of the sleeve shaft (3) is mounted with a stopper (332), the stopper (332) and the protrusion (331) cooperate with each other; The dial plate (4) is composed of a horizontal portion (41) and an inclined portion (42). The cross section of the dial plate (4) is in a "Z" shape. The horizontal portion (41) is parallel to the horizontal plane, and an angle is formed between the inclined portion (42) and the horizontal portion (41). The inclined portion (42) is provided with evenly distributed mesh holes; The end surface of one end of the protrusion (331) is rounded, and the end surface of the other end of the protrusion (331) is perpendicular to the upper surface of the mounting seat (33).

2. The method for analyzing and testing the productivity of staged fracturing tracer according to claim 1, characterized in that: A guide surface (15) is provided at the edge of the bottom surface of the box body (1). The bottom surface of the box body (1) is in an arc shape. The injection pipe (12) is connected to the middle position of the bottom surface of the box body (1). The mounting seat (33) is located directly above the opening of the injection pipe (12) in the box body (1). The inlet pipe (11) is mounted on the top cover of the box body (1).

3. The method for analyzing and testing the productivity of staged fracturing tracer according to claim 2, characterized in that: A connecting shaft (5) is mounted on the lower end of the rotating shaft (2), and a blade is mounted on the connecting shaft (5). The blade is located between the mounting seat (33) and the opening of the injection pipe (12) on the box body (1).

4. A staged fracturing tracer productivity analysis and testing method according to claim 3, characterized in that: The blades comprise an upper blade (51) and a lower blade (52); the upper blade (51) is fixedly mounted on the connecting shaft (5); and the lower blade (52) is rotatably mounted on the connecting shaft (5); the upper blade (51) is located above the opening of the injection pipe (12) on the box body (1); and the lower blade (52) is located inside the opening of the injection pipe (12) on the box body (1); and the upper blade (51) and the lower blade (52) rotate in opposite directions.

5. The method for analyzing and testing the productivity of staged fracturing tracer according to claim 1, characterized in that: An isolation coating is provided inside the delivery device and on the surface of each component, and the isolation coating has good hydrophobic and oleophobic properties.

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