Equipment for evaluating fracturing implementation effect through tracer agent

Abstract

The invention provides equipment for evaluating a fracturing implementation effect through a tracer agent. The equipment comprises a tracer agent preparation device, the pump injection device is connected with the tracer agent preparation device and used for putting the prepared tracer agent into the stratum; the tracer detection device comprises a flow-back liquid treatment device for receiving and treating the flow-back liquid and an analysis instrument for detecting and analyzing a tracer in the flow-back liquid; the central control device is connected with and controls the tracer agent preparation device, the pump injection device and the tracer agent monitoring device; and the central control device obtains fracturing implementation effect data according to an analysis result of the analysis instrument.

Description

[0001] Related Applications This application claims the priority of Chinese patent application CN 202310855402.9, filed on July 12, 2023, entitled “A tracer and an integrated device and method for preparation, pumping and monitoring thereof”, and the entire contents of CN202310855402.9 are incorporated herein by reference. Technical Field

[0002] The invention relates to a tracer and equipment for evaluating the effect of fracturing by using the tracer, belonging to the technical field of shale oil and gas exploration and development. Background Art

[0003] Fluid tracers refer to chemicals that flow with fluids and indicate the presence, flow direction, and flow rate of the fluids. Interwell tracer technology is to inject tracer plugs from injection wells and take samples from surrounding production wells to monitor the tracer production. See the well description of the tracer. There are connecting channels between the injection and production wells. The breakthrough time of the tracer can be used to determine the breakthrough rate of the injected fluid in each well. The number of connected layers is related to the peak number of tracer output. Through software fitting calculation, the degree of connectivity of the injection and production well network can be quantitatively described, and the heterogeneity of the reservoir in the plane and vertical direction can be evaluated. With the current domestic shale oil and gas exploration and development process of increasing production and storage, the deployment of infill layers and infill wells is increasingly being used in horizontal fracturing design to indicate inter-well connectivity, calculate the degree of flowback of a single fracturing stage, and clarify the migration characteristics of the fracturing fluid. Therefore, the rational use of tracer monitoring technology plays an important role in optimizing the deployment of shale oil and gas exploration and development.

[0004] There are no corresponding standards and process specifications for fluid tracers and their applications, and the industry lacks relevant instruments and supporting technologies. The general technical process for evaluating the effect of shale oil and gas fracturing with trace element fluid tracers is as follows: prepare the tracer solution before fracturing the horizontal section of the shale oil and gas well; place the tracer into the target fracturing section during the fracturing process; after the fracturing construction is completed, collect the return fluid from the tracer implementation well and the monitoring target well, and use an inductively coupled plasma mass spectrometer to detect the concentration of trace elements in the return fluid after a certain treatment of the return fluid, and evaluate the fracturing effect by comparing and calculating the concentration of trace elements in the tracer and return fluid.

[0005] However, the types and functions of instruments for fluid tracer applications are relatively simple. The more representative instruments and devices are: (1) Chinese patent document CN114674595A discloses a sampling device for non-radioactive tracer monitoring, which mainly relates to the technical field of tracer sampling devices. Its unique advantages are that by providing a first threaded rod that can be spliced ​​and extended and connecting a sampling tube at its part, and by driving the first threaded rod into the ground, tracer samples at different depths can be collected, and the sampling tube is provided with multiple sampling cavities inside, so that multiple samples at different depths can be sampled at one time; (2) Chinese patent document CN111005714B discloses a method for monitoring oil well production using tracers, which involves a tracer collection device installed on a wellhead pipeline. The method mainly injects two tracer solutions into the upstream of the wellhead pipeline at a set constant flow rate, and collects mixed liquid samples in the pipeline at the downstream of the wellhead pipeline of a single well at a set fixed frequency within a set sampling period. By comparing the tracer injection concentration with the detection concentration in the sample, the oil and water production of a single well within a certain period of time can be accurately measured. The method has the characteristics of meeting the timeliness and accuracy required for oil field production.

[0006] The above analysis shows that the existing devices and technologies are generally only used for a certain link in the tracer application process. Each link is relatively independent, and there is a lack of integrated devices and methods for the entire system process. This is not conducive to simplifying the overall tracer implementation process and shortening the monitoring cycle. In addition, due to the differences in devices and technologies among companies, the actual implementation effects are difficult to compare, and the effectiveness of the technology cannot be ensured. Summary of the invention

[0007] In view of the above-mentioned technical problems existing in the prior art, the present invention proposes a device for evaluating the effect of fracturing by using tracers, which can realize the integration and automation of tracer preparation, pumping, collection, processing and monitoring, and provide scientific data for optimizing shale oil and gas exploration and development plans and horizontal well deployment decisions.

[0008] The present invention proposes a device for evaluating the effect of fracturing by using a tracer, the device comprising: Tracer preparation device; A pumping device connected to the tracer preparation device to inject the prepared tracer into the formation; a tracer detection device, the tracer detection device comprising a flowback fluid processing device for receiving and processing the flowback fluid and an analysis instrument for detecting and analyzing the tracer in the flowback fluid; and A central control device, the central control device is connected to and controls the tracer preparation device, the pumping device and the tracer monitoring device; Wherein, the central control device obtains the fracturing implementation effect data according to the analysis result of the analysis instrument.

[0009] A further improvement of the present invention is that the tracer preparation device includes a liquid preparation tank, the inlet of the liquid preparation tank is connected to an external water source through a liquid inlet pipeline, and the outlet of the liquid preparation tank is connected to a pumping device through a liquid outlet pipeline.

[0010] A further improvement of the present invention is that at least one reagent delivery bin is provided on the upper part of the liquid preparation bin, and the reagent delivery bin contains raw material reagents for preparing the tracer.

[0011] A further improvement of the present invention is that a stirring device is provided inside the liquid preparation bin, and the stirring device is provided below the reagent delivery bin; and a filter screen is provided below the stirring device.

[0012] A further improvement of the present invention is that a weight meter is provided on the reagent delivery bin for real-time detection of the weight information of the reagent delivery bin and transmission to the central control device; the central control device controls the switch of the reagent delivery bin according to the weight information.

[0013] A further improvement of the present invention is that a sewage filtering and purifying device is provided on the liquid inlet pipeline, and the sewage filtering and purifying device comprises a tank body, and a pressure regulating valve is provided at the inlet end of the tank body; a filter screen and a particle recovery bin are provided inside the tank body.

[0014] A further improvement of the present invention is that the analytical instrument comprises a portable inductively coupled plasma mass spectrometer; the inlet of the analytical instrument is connected to the outlet of a return liquid treatment device through a return liquid pipeline, and the inlet end of the return liquid treatment device is externally connected to a manifold fluid separator.

[0015] A further improvement of the present invention is that the return liquid treatment device includes a return liquid filtering and purifying device, and a return liquid separation and constant volume device is arranged downstream of the return liquid filtering and purifying device.

[0016] A further improvement of the present invention is that the return liquid separation and volume fixing device is connected to the analysis instrument via a return liquid pipeline.

[0017] A further improvement of the present invention is that a discharge nozzle is also provided on the return liquid separation and volume setting device.

[0018] Compared with the prior art, the advantages of the present invention are: The device for evaluating the effect of fracturing by using tracers described in the present invention realizes the integration of tracer preparation, pumping and monitoring, and establishes corresponding technical process methods, thereby realizing the integrated implementation of the whole process of preparation, pumping, collection, treatment and monitoring of fluid tracers, providing effective support for shale oil and gas fracturing effect evaluation and horizontal well deployment decision-making, and providing an original and applicable experimental device for shale oil and gas exploration and development. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which are not drawn according to actual scale.

[0020] Figure 1 The schematic diagram of the device for evaluating the effect of fracturing by using a tracer according to one embodiment of the present invention is shown. Figure 1 The meanings of the reference numerals are as follows: 101. Water supply source, 102. First valve, 103. Sewage filtration and purification device, 104. Second valve, 105. Inlet, 106. Liquid preparation bin, 107. First reagent delivery bin, 108. Second reagent delivery bin, 109. Third reagent delivery bin, 110. Stirring device, 111. Filter screen, 112. Outlet, 113. Third valve, 114. Horizontal flow pump, 115. Fourth valve, 116. Sand mixer, 117. Manifold fluid separator, 118. Fourth valve, 119. Backflow liquid filtration and purification device, 120. Fifth valve, 121. Backflow liquid separation and constant volume device, 122. Sixth valve, 123. Spout, 124. Backflow liquid pipeline, 125. Inductively coupled plasma mass spectrometer, 126. Central control circuit, 127. Central control device, 128. Central control circuit. DETAILED DESCRIPTION

[0021] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0022] The present invention proposes a device for evaluating the effect of fracturing by means of a tracer. The tracer is the tracer provided by the present invention, which realizes the integrated implementation of the whole process of preparation, pumping, collection, treatment and monitoring of the fluid tracer, provides effective support for the evaluation of shale oil and gas fracturing effects and horizontal well deployment decisions, and provides an experimental device with originality and applicability for shale oil and gas exploration and development.

[0023] Figure 1 A device for evaluating the effect of fracturing by using a tracer according to the present invention is schematically shown, comprising: The tracer preparation device is used to automatically prepare the tracer. The inlet 105 of the tracer preparation device is connected to the water supply source 101, and a silo for holding raw materials can be provided inside to automatically prepare the raw material components of the tracer to be prepared as needed. The outlet of the tracer preparation device is connected to a pumping device, and the prepared tracer is injected into the formation through the pumping device.

[0024] The tracer monitoring device is used to detect the tracer in the flowback fluid. The tracer monitoring device is connected to the flowback fluid. The tracer detection device includes a flowback fluid processing device and an analysis instrument for the trace element tracer.

[0025] The device for evaluating the effect of fracturing by using a tracer in this embodiment further includes a central control device 127, and the central control device 127 is connected to the tracer preparation device and the tracer monitoring device; The central control device 127 controls the tracer preparation device and the tracer monitoring device in real time, and the central control device 127 performs statistics and analysis on the analysis results of the analysis instrument to obtain the fracturing implementation effect data.

[0026] According to the device for evaluating the effect of fracturing by using a tracer as described in this embodiment, the preparation, pumping and monitoring of the tracer are integrated, and full automation is achieved through the central control device 127. Fully automated fluid tracer preparation and dynamic monitoring is of great significance to the evaluation of shale oil and gas development effects, solves the on-site demand for instant tracer monitoring data, unifies the overall implementation process, improves work efficiency, and provides applicable experimental devices and scientific experimental data for shale oil and gas fracturing effect evaluation and horizontal well deployment decision-making.

[0027] In one embodiment, the tracer preparation device includes a liquid preparation tank 106, which is a cylindrical container, with an inlet 105 disposed at the upper portion and an outlet disposed at the lower portion. Figure 1 As shown, the inlet 105 of the liquid preparation tank 106 is arranged on the upper side, and the outlet is arranged on the other side at the lower side. The inlet 105 of the liquid preparation tank 106 is connected to the water supply source 101 through the liquid inlet pipeline, and the water supply source 101 provides the water required for preparing the tracer to the liquid preparation tank 106. The liquid outlet is connected to the liquid outlet pipeline, and the pumping device is connected through the liquid outlet pipeline.

[0028] The upper part of the liquid preparation bin 106 is provided with a plurality of reagent delivery bins, in which raw material reagents for preparing tracers are contained. The reagent delivery bins are arranged on the top cover of the liquid preparation bin 106, and a plurality of reagent delivery bins are arranged side by side. The number of reagent delivery bins is selected according to the raw materials of the tracers to be prepared.

[0029] A valve is provided at the lower end of the reagent delivery bin, and the valve can be controlled by the central control device 127 to adjust the opening, thereby controlling the speed and amount of injecting the raw material reagent. In this embodiment, the raw material contained in the reagent delivery bin can be a liquid reagent, or a powdered or granular raw material.

[0030] The water supply source 101 provides water, which enters the liquid preparation bin 106 through the liquid inlet pipeline, and the reagent delivery bin delivers reagents into the liquid preparation bin 106 at the same time. The central control device 127 controls the amount of water flowing in and the amount of reagent delivered, and the delivered reagents are mixed with water in the liquid preparation bin 106 to form a tracer. The prepared tracer flows out from the outlet.

[0031] In a preferred embodiment, the reagent delivery bin is equipped with a real-time weight meter, which is connected to the central control device 127. The central control device 127 adjusts the valve of the actual delivery bin according to the changes of the real-time weight meter, and controls the amount of reagent delivery in combination with the valve.

[0032] In one embodiment, a stirring device 110 is disposed inside the liquid preparation bin 106 , a filter screen 111 is disposed at the lower portion of the liquid preparation bin 106 , and the stirring device 110 is disposed between the reagent delivery bin and the filter screen 111 .

[0033] Preferably, the stirring device 110 includes a vertically arranged rotating shaft and a plurality of blades horizontally arranged on the rotating shaft. The rotation of the rotating shaft drives the blades to rotate, thereby mixing the raw material reagents into the water, and the preparation is completed after filtering.

[0034] The stirring device 110 can be provided to fully mix the water and the reagent, and after being fully mixed, the impurities are filtered out through the filter net and then discharged.

[0035] Preferably, the filter 111 is a 40-mesh filter 111 to prevent particulate matter in the reagent from passing through.

[0036] In one embodiment, a sewage filtration and purification device is provided on the liquid inlet pipeline of the liquid preparation tank 106. In this embodiment, the external water supply source 101 for preparing the tracer can be recycled water or sewage, which is purified by the sewage filtration and purification device and used to prepare the tracer, thereby saving costs.

[0037] The sewage filtering and purifying device 103 includes a tank body; a pressure regulating valve is provided on the inlet 105 of the tank body, and a filter screen and a particle recovery bin are provided inside the tank body. The pressure regulating valve can adjust the water pressure of the incoming water to make the water pressure of the incoming water stable and in a suitable state, and the filter screen can filter particles or other impurities and guide the filtered particles or other impurities into the particle recovery bin. The filter screen is a 40-mesh filter screen 111.

[0038] In one embodiment, the pumping device includes a horizontal flow pump 114 disposed on the liquid outlet pipeline, and the horizontal flow pump 114 is connected to a sand mixing vehicle 116, and the prepared tracer is injected into the well through the sand mixing vehicle 116. The sand mixing vehicle 116 is a main supporting equipment for oilfield fracturing and sand control operations, and is mainly used for mixing, stirring, and conveying media such as sand liquid required for fracturing operations. The prepared tracer is injected into the well through the sand mixing vehicle 116.

[0039] In one embodiment, the analytical instrument comprises a portable inductively coupled plasma mass spectrometer 125; the inlet 105 of the analytical instrument is connected to a return liquid treatment device via a return liquid pipeline 124, and the inlet end of the return liquid treatment device is externally connected to a manifold fluid separator 117.

[0040] The Inductively Coupled Plasma Mass Spectrometer 125 is an analytical instrument used to determine the mass fraction of various elements in a sample. It is based on plasma technology, and the sample being tested is inductively coupled to a high-frequency electromagnetic field, so that the atoms in the sample are ionized and gain energy during the ionization process. After ionization, these ions are accelerated and focused in a high-frequency electromagnetic field to form an instantaneous plasma beam. By measuring the speed and density of the plasma beam, the mass fraction of various elements in the sample can be determined.

[0041] In this embodiment, the inductively coupled plasma mass spectrometer preferably adopts a portable inductively coupled plasma mass spectrometer 125, which can be installed on an instrument vehicle to carry out ICP-MS testing outdoors (here it is used as an analytical instrument for trace element tracers, and other analytical instruments can also be expanded), and then the return fluid data of different periods are statistically processed and analyzed through the central control device 127.

[0042] In one embodiment, the return liquid treatment device includes a return liquid filtration and purification device 119, and a return liquid separation and constant volume device 121 is arranged downstream of the return liquid filtration and purification device 119. The return liquid filtration and purification device 119 may have the same structure as or different from the sewage filtration and purification device. In this embodiment, the preferred structure of the return liquid filtration and purification device 119 is somewhat different from the structure of the sewage filtration and purification device.

[0043] The return liquid filtration and purification device 119 includes a tank body; a pressure regulating valve is provided on the inlet 105 of the tank body, and a filter screen 111, an activated carbon layer, a sponge layer and a particle recovery bin are provided inside the tank body. The filter screen is a 200-mesh filter screen 111. The activated carbon layer and the sponge layer play a role in adsorbing impurities. The pressure regulating valve can adjust the water pressure of the incoming water to make the water pressure of the incoming water stable and in a suitable state, and the filter screen can filter particles or other impurities and guide the filtered particles or other impurities into the particle recovery bin.

[0044] In one embodiment, the return liquid separation and volume fixing device 121 is connected to the analytical instrument via a return liquid pipeline 124 , and a discharge nozzle 123 is also provided on the return liquid separation and volume fixing device 121 .

[0045] Preferably, a first valve 102 and a second valve 104 are provided on the liquid inlet pipeline, the first valve 102 is provided upstream of the sewage filtration and purification device 103, the second valve 104 is provided downstream of the sewage filtration and purification device 103, and a flow meter is also provided at the position of the second valve 104 for measuring the water entering the liquid distribution tank 106.

[0046] The liquid outlet pipeline is provided with a third valve 113 and a fourth valve 115 . The third valve 113 is provided upstream of the horizontal flow pump 114 , and the fourth valve 115 is provided downstream of the horizontal flow pump 114 . A flow meter is provided at the position of the fourth valve 115 for measuring the flow rate of the tracer injected into the sand blending truck 116 .

[0047] A fifth valve 118, a sixth valve 120 and a seventh valve 122 are provided on the return liquid pipeline 124. The fifth valve 118 is provided upstream of the return liquid filtration and purification device 119, and the sixth valve 120 is provided between the return liquid filtration and purification device 119 and the return liquid separation and constant volume device 121. The seventh valve 122 is provided at the position of the discharge nozzle 123. A flow meter is provided at the position of the fifth valve 118 to measure the flow of the return liquid.

[0048] The first valve 102 , the second valve 104 , the third valve 113 , the fourth valve 115 , the fifth valve 118 , the sixth valve 120 and the seventh valve 122 are all connected to the central control device 127 , and the central control device 127 controls the opening and closing of the valves and adjusts the opening degrees of the valves.

[0049] The central control device 127 is also connected to the reagent delivery bin to control the speed and amount of the reagent delivered by the reagent delivery bin.

[0050] The flow meter is connected to the central control device 127 to feed back the flow in the pipeline to the central control device 127, thereby facilitating the central control device 127 to adjust each valve.

[0051] In addition, the central control device 127 is also connected to the stirring device 110 to control the stirring speed, and is also connected to the horizontal flow pump 114. The pumping flow rate of the horizontal flow pump 114 can be adjusted to control the pumping rate.

[0052] According to another aspect of the present invention, a method is also proposed, which is a method for using a device for evaluating the effect of fracturing by using a tracer, and comprises: The device is debugged at the development well site to ensure that all electronic equipment and sensors operate normally and that the central control device 127 is under normal control. The tracer preparation device and the tracer monitoring device are assembled.

[0053] The inlet 105 of the liquid preparation tank 106 is connected to the water supply source 101, the outlet is connected to the sand mixing truck 116, the tracer monitoring device is connected to the tracer monitoring target well manifold fluid separator 117, and the return liquid separation and constant volume device 121 is connected to the return liquid discharge nozzle 123.

[0054] Prepare the tracer preparation reagents A, B, and C in the reagent delivery bins and place them inside the three reagent delivery bins.

[0055] The first valve 102 and the second valve 104 are opened, the flow at the second valve 104 is monitored by the central control device 127, and the reagents A, B, and C are added, and the stirring device 110 is started to complete the preparation of the tracer. Then, the first valve 102 and the second valve 104 are closed, the third valve 113 and the fourth valve 115 are opened, and the tracer is uniformly added to the sand blending vehicle 116 through the central control device 127. After the addition is completed, the third valve 113 and the fourth valve 115 are closed.

[0056] The sediment at the filter screen of the sewage filtering and purifying device 103 is cleaned, and the sediment and insoluble matter at the filter screen 111 in the liquid preparation tank 106 are cleaned.

[0057] After the fracturing construction is completed, when the tracer monitoring target well is opened, the fifth valve 118 and the sixth valve 120 are opened, and the pressure regulating valve of the return fluid filtration and purification device 119 is adjusted by the central control device 127 until the tank is filled with return fluid, and the fifth valve 118 is closed.

[0058] After the return liquid in the return liquid filtration and purification device 119 is filtered and purified, the sixth valve 120 is opened to receive the return liquid into the return liquid separation and constant volume device 121, and part of the return liquid collected by the oil-water separator enters the constant volume pipe and is constant volume to 10 ml of liquid.

[0059] The sixth valve 120 is closed, and the seventh valve 122 is opened to discharge the remaining backflow liquid from the discharge nozzle 123. Then the seventh valve 122 is closed.

[0060] The return liquid in the constant volume tube is extracted by an automatic sampler and sent to the inductively coupled plasma mass spectrometer 125 for ICP-MS analysis, and the analysis results are transmitted to the central control device 127.

[0061] The central control device 127 is used to collect statistics and analyze the analysis results to evaluate the effect of fracturing implementation.

[0062] After the analysis is completed, shut down all equipment and clean up the sediment and impurities in the return liquid filtration and purification device.

[0063] The method described in this embodiment can realize the integrated development mode of the whole process of fluid tracer preparation, pumping, collection, processing and monitoring at the shale oil and gas well development site, meet the timeliness requirements of tracer monitoring data at the site, unify the overall workflow of tracer monitoring technology, improve work efficiency, and greatly enhance the comparability of tracer monitoring data and results for different target wells and target layers. It provides applicable experimental devices and scientific experimental data for shale oil and gas fracturing effect evaluation and horizontal well deployment decision-making.

[0064] According to the present invention, preferably, the application includes: using the tracer described in the first aspect above to: determine the connectivity between the shale gas development well and the adjacent wells, calculate the fracturing fluid return rate of the tracer injection section, and determine the migration direction of the fracturing fluid in the formation and calculate the migration rate.

[0065] According to the present invention, in the application, by understanding the connectivity relationship between the development well and the adjacent production wells during the fracturing process, the effect of the fracturing construction can be effectively evaluated (generally, connectivity will lead to poor fracturing effect). Further, the rationality of the well spacing setting can be evaluated (for example, if it is determined to be connected, it is necessary to consider increasing the spacing setting of other wells in the area to avoid connectivity between other wells), which is beneficial to the optimization of the development plan.

[0066] According to the present invention, in the application, by calculating the flowback rate of a single fracturing stage, it is possible to judge the fracturing effect (it is generally believed that the fracturing effect corresponding to a high flowback rate fracturing stage is poor). In addition, the water production, estimated gas production and remaining recoverable volume of a single fracturing stage can be calculated by the flowback rate, and these parameters are helpful to more reasonably regulate the later shale gas production and development cycle.

[0067] According to the present invention, in the application, the migration direction of the fracturing fluid in the formation is determined and the migration rate is calculated, so that the migration of the fracturing fluid in the formation can be obtained, and key evidence can be provided for the high flowback characteristics of nearby development wells during production (the characteristic that the flowback volume of the well is higher than the fracturing fluid volume during shale gas production), and whether the high flowback rate is caused by the migration of the fracturing fluid. In addition, it also has a certain indicative significance for correctly understanding the stress effect of the formation and the migration law of the formation fluid.

[0068] According to the present invention, in the application, the actual usage of the tracer is determined by detecting the concentration of rare earth elements in the initial flowback fluid of the formation and combining the concentration of rare earth elements in the initial flowback fluid of the formation and the amount of fracturing fluid in the shale gas development well.

[0069] Preferably, the concentration of rare earth elements in the initial flowback fluid from the formation is detected by an inductively coupled plasma mass spectrometer.

[0070] The use of the tracer provided by the present invention in shale oil and gas exploration and development can more continuously and effectively monitor the connectivity between layers or horizontal sections in real time, quantitatively analyze the return rate of single-stage fracturing fluid, determine the migration direction of fracturing fluid in the formation and calculate the migration rate, and can be well used for qualitatively evaluating the implementation effect of horizontal well fracturing and optimizing the fracturing construction deployment in the target area.

[0071] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0072] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0073] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] Certain terms are used throughout this specification to refer to specific system components. As will be appreciated by those skilled in the art, different names may be used to refer to the same component, and thus this specification is not intended to distinguish between components that differ only in name and not in function. References to "one embodiment" or "an embodiment" in the specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the invention. Therefore, the phrases "one embodiment" or "an embodiment" appearing in various places throughout the specification do not necessarily all refer to the same embodiment.

[0075] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0076] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for evaluating the effect of fracturing by using a tracer, characterized in that: include: Tracer preparation device; A pumping device connected to the tracer preparation device to inject the prepared tracer into the formation; A tracer detection device, the tracer detection device comprising a flowback fluid processing device for receiving and processing the flowback fluid and an analysis instrument for detecting and analyzing the tracer in the flowback fluid; as well as A central control device (127), the central control device (127) being connected to and controlling the tracer preparation device, the pumping device and the tracer monitoring device; The central control device (127) obtains fracturing effect data based on the analysis results of the analysis instrument.

2. The device for evaluating the effect of fracturing by using a tracer according to claim 1, characterized in that: The tracer preparation device comprises a liquid preparation tank (106), an inlet (105) of the liquid preparation tank (106) is connected to an external water source (101) via a liquid inlet pipeline, and an outlet of the liquid preparation tank (106) is connected to a pumping device via a liquid outlet pipeline.

3. The device for evaluating the effect of fracturing by using a tracer according to claim 2, characterized in that: At least one reagent delivery bin is provided on the upper part of the liquid preparation bin (106), and the reagent delivery bin contains a raw material reagent for preparing a tracer.

4. The device for evaluating the effect of fracturing by using a tracer according to claim 3, characterized in that: A stirring device (110) is arranged inside the liquid preparation bin (106), and the stirring device (110) is arranged below the reagent delivery bin; a filter screen is arranged below the stirring device.

5. The device for evaluating the effect of fracturing by using a tracer according to claim 3 or 4, characterized in that: The reagent delivery bin is provided with a weight meter for detecting the weight information of the reagent delivery bin in real time and transmitting the weight information to the central control device (127); the central control device (127) controls the switch of the reagent delivery bin according to the weight information.

6. The device for evaluating the effect of fracturing by using a tracer according to claim 5, characterized in that: The liquid inlet pipeline is provided with a sewage filtering and purifying device, which comprises a tank body, and a pressure regulating valve is provided at the inlet end of the tank body; a filter screen and a particle recovery bin are provided inside the tank body.

7. The device for evaluating the effect of fracturing by using a tracer according to claim 6, characterized in that: The analytical instrument comprises a portable inductively coupled plasma mass spectrometer (125); the inlet (105) of the analytical instrument is connected to the outlet of a return liquid processing device via a return liquid pipeline (124); the inlet end of the return liquid processing device is externally connected to a manifold fluid separator (117).

8. The device for evaluating the effect of fracturing by using a tracer according to claim 7, characterized in that: The return liquid treatment device comprises a return liquid filtering and purifying device (119), and a return liquid separation and volume fixing device (121) is arranged downstream of the return liquid filtering and purifying device (119).

9. The device for evaluating the effect of fracturing by using a tracer according to claim 8, characterized in that: The return liquid separation and volume setting device (121) is connected to the analysis instrument via a return liquid pipeline (124).

10. The device for evaluating the effect of fracturing by using a tracer according to claim 9, characterized in that: The return liquid separation and volume setting device (121) is also provided with a discharge nozzle (123).

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