Method and system for evaluating the anti-wax effect of solid anti-wax agent

Abstract

The present invention provides a method and system for evaluating the anti-wax effect of a solid wax inhibitor, the method comprising: using a first solid wax inhibitor to be tested to treat condensate gas; passing the condensate gas treated with the first solid wax inhibitor to be tested into a pressure vessel, and adjusting the temperature of the pressure vessel under a preset pressure until the condensate gas precipitates wax; recording the temperature when wax is precipitated, and comparing the temperature with the preset temperature; when the temperature is less than the preset temperature, the first solid wax inhibitor to be tested has an anti-wax effect. The system comprises: a storage tank for storing condensate gas; a core model for storing the solid wax inhibitor to be tested; a condensate gas wax precipitation point test device, comprising a pressure vessel for accommodating condensate gas treated with the solid wax inhibitor to be tested; a first pipeline for connecting the storage tank with the core model; and a second pipeline for connecting the core model with the pressure vessel. The method provided by the present invention can evaluate the anti-wax effect of a solid wax inhibitor in a condensate gas well.

Description

Technical Field

[0001] The invention relates to a method and a system for evaluating the anti-wax effect of a solid anti-wax agent, belonging to the technical field of oil and gas exploitation. Background Art

[0002] During the production process of condensate gas reservoirs, as the temperature and pressure continue to decrease, the wax deposition in the condensate gas wells will become more and more serious. If the wax is not removed in time, the condensate gas production will decrease, and in severe cases, it will also affect the gas production equipment.

[0003] In the prior art, solid wax inhibitors can be used to treat condensate gas to prevent wax deposition, so as to reduce the degree of wax deposition in condensate gas wells. Different solid wax inhibitors have different effects on wax deposition in condensate gas.

[0004] However, the current application of solid wax inhibitors in condensate gas wells at home and abroad is focused on the preparation of solid wax inhibitors and the installation of solid wax inhibitors in condensate gas wells. There is no relevant method and device to evaluate the anti-wax effect of solid wax inhibitors in condensate gas wells, so those skilled in the art cannot know the anti-wax effect of solid wax inhibitors in condensate gas wells. Summary of the invention

[0005] The present invention provides a method and system for evaluating the anti-wax effect of a solid anti-wax agent, so as to solve the technical problem that there is no relevant method and device for evaluating the anti-wax effect of a solid anti-wax agent in a condensate gas well in the prior art.

[0006] In one aspect, the present invention provides a method for evaluating the anti-wax effect of a solid anti-wax agent, comprising:

[0007] treating the condensate gas with a first solid wax inhibitor to be tested;

[0008] Passing the condensate gas treated with the first solid wax inhibitor to be tested into a pressure vessel, and adjusting the temperature of the pressure vessel at a preset pressure until the condensate gas treated with the first solid wax inhibitor to be tested is waxed;

[0009] Recording the temperature of the condensate gas treated with the first solid wax inhibitor to be tested when wax is precipitated, and comparing the temperature with a preset temperature;

[0010] When the temperature is lower than the preset temperature, the first solid anti-wax agent to be tested has an anti-wax effect.

[0011] Furthermore, the method further comprises preparing the condensate gas.

[0012] Further, preparing the condensate gas specifically includes:

[0013] Prepare single degassing;

[0014] The degassing gas and crude oil are mixed according to a preset volume ratio to obtain the condensate gas.

[0015] Furthermore, it also includes:

[0016] Passing the condensate gas into the pressure vessel, and adjusting the temperature of the pressure vessel at the preset pressure until the condensate gas separates out wax;

[0017] The temperature at which the condensate gasifies and wax is separated is recorded as the preset temperature.

[0018] Furthermore, it also includes:

[0019] Treating the condensate gas with a second solid paraffin inhibitor to be tested;

[0020] Passing the condensate treated with the second solid wax inhibitor to be tested into a pressure vessel, and adjusting the temperature of the pressure vessel at a preset pressure until the condensate treated with the second solid wax inhibitor to be tested is waxed;

[0021] Recording the temperature of the condensate gas treated with the second solid wax inhibitor to be tested when wax is precipitated, and comparing the temperature with the temperature of the condensate gas treated with the first solid wax inhibitor to be tested when wax is precipitated;

[0022] When the temperature at which wax is precipitated from the condensate gas treated with the first solid wax inhibitor to be tested is lower than the temperature at which wax is precipitated from the condensate gas treated with the second solid wax inhibitor to be tested, the anti-wax effect of the first solid wax inhibitor to be tested is greater than that of the second solid wax inhibitor to be tested.

[0023] Another aspect of the present invention further provides a system for implementing any of the above methods, comprising:

[0024] Storage tanks for storing condensate gas;

[0025] Core model, used to store the solid wax inhibitor to be tested;

[0026] A condensate gas wax precipitation point testing device comprises a pressure vessel for containing the condensate gas treated with the solid wax inhibitor to be tested;

[0027] a first pipeline, used to connect the storage tank with the core model;

[0028] The second pipeline is used to connect the core model with the pressure container.

[0029] Furthermore, the condensate gas wax precipitation point testing device also includes a processor, which is used to record the temperature of the condensate gas treated with the solid wax inhibitor to be tested when wax is precipitated, and compare the temperature with a preset temperature.

[0030] Furthermore, it also includes a back-pressure valve, a hand pump, and a pressure gauge, wherein the back-pressure valve is installed on the second pipeline, the hand pump is connected to the back-pressure valve through a third pipeline, and the pressure gauge is installed on the third pipeline, wherein the hand pump is used to provide pressure to the back-pressure valve.

[0031] Furthermore, it also includes a flow meter and a drying tube, and the flow meter and the drying tube are both installed on the first pipeline.

[0032] Furthermore, the condensate gas wax precipitation point testing device is a visual PVT microscopic testing device, or a rotational viscometer testing device.

[0033] The present invention provides a method and system for evaluating the anti-wax effect of a solid wax inhibitor, including: using a first solid wax inhibitor to be tested to treat condensate gas; passing the condensate gas treated with the first solid wax inhibitor to be tested into a pressure vessel, and adjusting the temperature of the pressure vessel at a preset pressure until the condensate gas treated with the first solid wax inhibitor to be tested precipitates wax; recording the temperature of the condensate gas treated with the first solid wax inhibitor when wax is precipitated, and comparing the temperature with a preset temperature; when the temperature is less than the preset temperature, the first solid wax inhibitor to be tested has an anti-wax effect. The present invention obtains the wax precipitation temperature of the condensate gas treated with the first solid wax inhibitor to be tested, and compares the wax precipitation temperature with a preset temperature. If the wax precipitation temperature is less than the preset temperature, the first solid wax inhibitor to be tested has an anti-wax effect. Since the temperature of the formation gradually decreases in the vertical upward direction, when the wax precipitation temperature of the condensate gas decreases, the position where the wax layer begins to appear in the corresponding oil pipe will move upward, that is, the wax layer will no longer appear at the place where the wax layer originally appeared after the condensate gas is treated with the first wax inhibitor to be tested, so the first solid wax inhibitor to be tested has an anti-wax effect, that is to say, the method provided by the present invention can evaluate the anti-wax effect of the solid wax inhibitor in the condensate gas well. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0035] Figure 1 A flow chart of a method for evaluating the anti-wax effect of a solid anti-wax agent provided in Example 1 of the present invention;

[0036] Figure 2 A flowchart of a method for obtaining a preset temperature provided in Embodiment 1 of the present invention;

[0037] Figure 3 A flowchart of another method for obtaining a preset temperature provided in Embodiment 1 of the present invention;

[0038] Figure 4A schematic diagram of the structure of a visual PVT microscopic testing device provided in Example 1 of the present invention;

[0039] Figure 5 A schematic diagram of the structure of a system for implementing a method for evaluating the anti-wax effect of a solid anti-wax agent provided in a second embodiment of the present invention;

[0040] Figure 6 A schematic diagram of the structure of a second system for implementing a method for evaluating the anti-wax effect of a solid anti-wax agent provided in Embodiment 2 of the present invention;

[0041] Figure 7 A schematic structural diagram of a system for implementing a method for evaluating the anti-wax effect of a solid anti-wax agent provided in the second embodiment of the present invention;

[0042] in:

[0043] 400 storage tanks; 500 core models;

[0044] 501 the first pressure gauge; 600 condensate gas wax precipitation point testing device;

[0045] 601 Visualized PVT Instrument; 6011 Visualized Microscope Window;

[0046] 602 microscopic probe; 603 display device;

[0047] 700 first pipeline; 701 flow meter;

[0048] 702 drying pipe; 800 second pipe;

[0049] 801 back pressure valve; 802 hand pump;

[0050] 803 second pressure gauge; 804 third pipeline;

[0051] 900 control valve. DETAILED DESCRIPTION

[0052] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0053] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected" and the like 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 direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] Embodiment 1

[0057] Figure 1 The flowchart of the method for evaluating the anti-wax effect of the solid anti-wax agent provided in this embodiment is as follows: Figure 2 A flow chart of a method for obtaining a preset temperature provided in this embodiment, Figure 3 A flowchart of another method for obtaining a preset temperature provided in this embodiment, Figure 4 The schematic diagram of the structure of the visual PVT microscopic testing device provided in this embodiment is shown below in conjunction with Figures 1 to 4 The implementation of this embodiment will be described in detail.

[0058] like Figure 1 As shown, the method for evaluating the anti-wax effect of a solid anti-wax agent provided in this embodiment includes:

[0059] 101: Treating condensate gas using the first solid paraffin inhibitor to be tested.

[0060] Specifically, the first solid anti-wax agent to be tested in this embodiment can be any solid anti-wax agent, for example, it can be an active agent type solid anti-wax agent, or it can be a polymer type solid anti-wax agent, and the anti-wax effect of the solid anti-wax agent can be evaluated by the evaluation method provided in this embodiment.

[0061] The condensate gas in this embodiment can be obtained at the oil production site, or can also be obtained by a preparation method. Preferably, the preparation method is used to obtain the condensate gas, which can reduce production costs. The preparation method is used as an example to specifically illustrate the method for obtaining the condensate gas in this embodiment.

[0062] Preparation of condensate gas, including:

[0063] Prepare single degassing;

[0064] The degassing gas and crude oil are mixed according to a preset volume ratio to obtain the condensate gas.

[0065] Specifically, when preparing the single degassing, the molar components of the single degassing shown in Table 1 can be referred to for preparation. The preparation method is the mixed gas preparation method commonly used in the art, and reference can be made to "GB 5274-2008 Gas Analysis - Preparation of Mixed Gases for Calibration - Weighing Method".

[0066] Table 1 Molar composition of single degassing

[0067]

[0068] The degassing gas and crude oil are mixed according to a preset volume ratio, which can be any suitable ratio. For example, the volume ratio of the degassing gas and crude oil can be 15000:1, or 16150:1. The mixing method is a commonly used formation fluid preparation method in the art, and reference can be made to GB / T 26981-2011 Methods for Analysis of Physical Properties of Oil and Gas Reservoir Fluids, thereby obtaining condensate gas.

[0069] In this embodiment, using the first solid wax inhibitor to be tested to treat condensate gas includes:

[0070] The first solid wax inhibitor to be tested and the proppant are uniformly mixed according to a preset mass percentage. The preset mass percentage can be any suitable value, for example, 2%, or 3%, the proppant can be ceramsite, or quartz sand, and the type of the proppant is not specifically limited in this embodiment. The uniformly mixed first solid wax inhibitor to be tested and the proppant are filled into the core model 500.

[0071] The condensate gas prepared according to the above-mentioned preparation method is placed in a storage tank 400. The storage tank 400 may be a separate intermediate container for storing the condensate gas, or may also be a pressure gas tank used for preparing the condensate gas.

[0072] The storage tank 400 and the core model 500 are both in a constant temperature state, and the temperature of the constant temperature state is the temperature of the formation where the condensate gas is located during gas production, for example, it can be 80°C, or it can also be 90°C, or it can also be 130°C.

[0073] The condensate gas in the storage tank 400 is injected into the core model 500. When the pressure of the condensate gas in the core model 500 reaches a constant pressure, the air inlet valve on the storage tank 400 is closed to stop the condensate gas injection. Specifically, the constant pressure can be the pressure of the formation where the condensate gas is located during gas production, for example, it can be 70MPa, or it can also be 80MPa, or it can also be 100MPa. In one example, when the condensate gas is stored in a condensate gas intermediate container, the pressure of the condensate gas intermediate container can be greater than the pressure in the storage tank 400. For example, when the pressure in the storage tank 400 is 70MPa, the pressure of the condensate gas intermediate container can be increased to 80MPa. Under the action of the pressure difference, the gas in the storage tank 400 will flow to the core model 500, so that the pressure in the core model 500 will eventually become 70MPa;

[0074] The condensate gas in the core model is fully in contact with the first solid paraffin inhibitor to be tested, and the treatment process ends when the contact time reaches a preset time. Specifically, the preset time can be 24 hours, or it can also be 36 hours. Those skilled in the art can set the contact time according to the actual situation of the oil well and the specific environment of the experiment.

[0075] The specific method of treating condensate gas with the solid wax inhibitor to be tested is not limited to the treatment method provided in this embodiment, and any method can be used as long as it can simulate the process of treating condensate gas with the solid wax inhibitor in the actual oil production process.

[0076] 102: introducing the condensate gas treated with the first solid wax inhibitor to be tested into a pressure vessel, and adjusting the temperature of the pressure vessel at a preset pressure until the condensate gas treated with the first solid wax inhibitor to be tested is waxed.

[0077] Specifically, the pressure vessel is a temperature-controlled and pressure-controlled vessel, for example, the pressure vessel may be a visual PVT microscopic testing device, or a rotational viscometer testing device, or other equipment capable of constant pressure and temperature control operation.

[0078] The preset pressure is the pressure of the formation where the condensate gas is located during gas production. Please refer to the above description and will not be repeated here.

[0079] Adjusting the temperature of the pressure vessel includes gradually lowering the temperature of the pressure vessel, for example, adjusting the temperature from the temperature of the formation where the condensate gas is located during gas production to a lower temperature. The cooling rate can be any suitable rate, for example, it can be 0.5°C / min, or it can also be 0.2°C / min. Of course, the cooling can also be performed at different rates, for example, the cooling rate is 0.5°C / min at the beginning of the cooling, and after cooling for a period of time, the cooling rate is adjusted to 0.2°C / min to improve the cooling efficiency.

[0080] When the condensate gas begins to wax, the cooling is stopped. In one example, Figure 4 The visualized PVT microscopic test device shown is used to cool the condensate gas.

[0081] 103: Record the temperature of the condensate gas treated with the first solid wax inhibitor to be tested when wax is precipitated, and compare the temperature with a preset temperature.

[0082] Specifically, you can Figure 4 The visual PVT microscopic test device shown observes and records the temperature (hereinafter referred to as the first wax precipitation temperature) at which the condensate gas treated with the first solid wax inhibitor to be tested precipitates wax. For example, the visual PVT microscopic test device includes a visual PVT instrument 601, a microprobe 602 and a display device 603. A visual microscopic window 6011 is provided on the housing of the visual PVT instrument 601, and the microprobe 602 is used to detect objects in the visual microscopic window 6011. The microprobe 602 is electrically connected to the display device 603 to image the objects detected by the microprobe 602 on the display device 603. During the test, the microprobe 602 detects that paraffin crystals begin to appear in the visual microscopic window 6011, and the processor in the microprobe 602 transmits the detection signal to the display device 603, that is, when the image of paraffin crystals begins to appear on the display device 603, the temperature is stopped, and the control temperature displayed by the visual PVT microscopic test device is the first wax precipitation temperature.

[0083] The preset temperature is a temperature used for comparison. The preset temperature can be the wax precipitation temperature of the condensate gas that has not been treated with a solid wax inhibitor (hereinafter referred to as the second wax precipitation temperature), or it can be the wax precipitation temperature of the condensate gas that has been treated with a second solid wax inhibitor to be tested (hereinafter referred to as the third wax precipitation temperature).

[0084] In one example, the preset temperature is a second wax precipitation temperature, and the method for obtaining the second wax precipitation temperature includes: Figure 2 As shown:

[0085] 201: introducing condensate gas into a pressure vessel, and adjusting the temperature of the pressure vessel at a preset pressure until the condensate gas separates out wax;

[0086] 202: Record the temperature when the condensate gas is waxing out as the preset temperature.

[0087] The implementation of steps 201 and 202 is the same as the above-mentioned method of obtaining the temperature of the condensate gas treated with the first solid wax inhibitor when wax is precipitated, and the above description can be referred to, and will not be repeated here. After obtaining and recording the second wax precipitation temperature, the first wax precipitation temperature is compared with the second wax precipitation temperature.

[0088] In another example, the preset temperature is the third wax precipitation temperature, and the third wax precipitation temperature may be one or more, that is, the second solid wax inhibitor to be tested corresponding to the third wax precipitation temperature may be one or more. For example, when the second solid wax inhibitor to be tested is one, the method for obtaining the third wax precipitation temperature includes, for example, Figure 3 As shown:

[0089] 301: treating condensate gas using a second solid wax inhibitor to be tested;

[0090] 302: passing the condensate gas treated with the second solid wax inhibitor to be tested into a pressure vessel, and adjusting the temperature of the pressure vessel at a preset pressure until the condensate gas treated with the second solid wax inhibitor to be tested is waxed;

[0091] 303: Recording the temperature of the condensate gas treated with the second solid wax inhibitor to be tested when wax is precipitated, and comparing the temperature with the temperature of the condensate gas treated with the first solid wax inhibitor to be tested when wax is precipitated.

[0092] The implementation of steps 301 to 303 is the same as the implementation of the corresponding steps of obtaining the first wax precipitation temperature, and reference may be made to the above description, which will not be repeated here.

[0093] It is conceivable that in other examples, the second wax precipitation temperature and the third wax precipitation temperature can also be used as preset temperatures at the same time, that is, the second wax precipitation temperature is the wax precipitation temperature of the blank control group, and the third wax precipitation temperature is the wax precipitation temperature of the experimental control group, and the first wax precipitation temperature is compared with the second wax precipitation temperature and the third wax precipitation temperature at the same time.

[0094] 104: When the temperature is lower than the preset temperature, the first solid anti-wax agent to be tested has an anti-wax effect.

[0095] Specifically, in one example, the preset temperature is the second wax precipitation temperature. When the first wax precipitation temperature is lower than the second wax precipitation temperature, the first solid wax inhibitor to be tested has an anti-wax effect, that is, after being treated with the first solid wax inhibitor, the wax precipitation temperature of the condensate gas is reduced. For example, the wax precipitation temperature of the condensate gas that has not been treated with the first solid wax inhibitor is 50°C, and the wax precipitation temperature of the condensate gas treated with the first solid wax inhibitor is 30°C, that is, the condensate gas will only begin to wax when the temperature drops below 30°C. In the oil pipe, because the formation temperature gradually decreases in the vertical upward direction, the position where the condensate gas after being treated with the first solid wax inhibitor moves up vertically, that is, the place where the wax layer would appear will not have a wax layer after the condensate gas is treated with the first wax inhibitor to be tested, and the first solid wax inhibitor to be tested has an anti-wax effect.

[0096] In another example, the preset temperature is the third wax precipitation temperature, such as Figure 3 304 shown: When the temperature of wax precipitation from the condensate gas treated with the first solid wax inhibitor to be tested is lower than the temperature of wax precipitation from the condensate gas treated with the second solid wax inhibitor to be tested, the anti-wax effect of the first solid wax inhibitor to be tested is greater than the anti-wax effect of the second solid wax inhibitor to be tested. That is, when the first wax precipitation temperature is lower than the third wax precipitation temperature, the anti-wax effect of the first solid wax inhibitor to be tested is greater than the anti-wax effect of the second solid wax inhibitor to be tested. That is to say, the method provided in this embodiment can compare different wax inhibitors to obtain a wax inhibitor with better anti-wax effect.

[0097] The present embodiment provides a method for evaluating the anti-wax effect of a solid wax inhibitor, comprising: treating condensate gas with a first solid wax inhibitor to be tested; passing the condensate gas treated with the first solid wax inhibitor to be tested into a pressure vessel, and adjusting the temperature of the pressure vessel at a preset pressure until the condensate gas treated with the first solid wax inhibitor to be tested precipitates wax; recording the temperature of the condensate gas treated with the first solid wax inhibitor when wax is precipitated, and comparing the temperature with a preset temperature; when the temperature is less than the preset temperature, the first solid wax inhibitor to be tested has an anti-wax effect. The present embodiment obtains the wax precipitation temperature of the condensate gas treated with the first solid wax inhibitor to be tested, and compares the wax precipitation temperature with a preset temperature. If the wax precipitation temperature is less than the preset temperature, the first solid wax inhibitor to be tested has an anti-wax effect. Since the temperature of the formation gradually decreases in the vertical upward direction, when the wax precipitation temperature of the condensate gas decreases, the position where the wax layer begins to appear in the corresponding oil pipe will move upward, that is, the place where the wax layer originally appeared will no longer have a wax layer after the condensate gas is treated with the first wax inhibitor to be tested, so the first solid wax inhibitor to be tested has an anti-wax effect, that is to say, the method provided in this embodiment can evaluate the anti-wax effect of the solid wax inhibitor in the condensate gas well.

[0098] Embodiment 2

[0099] Figure 5 This is a schematic diagram of the structure of the first system for implementing the method for evaluating the anti-wax effect of a solid anti-wax agent provided in this embodiment. Figure 6 A schematic diagram of the structure of a second system for implementing a method for evaluating the anti-wax effect of a solid anti-wax agent provided in this embodiment, Figure 7 A schematic diagram of the structure of a third system for implementing a method for evaluating the anti-wax effect of a solid anti-wax agent provided in this embodiment is shown below in conjunction with Figures 5 to 7 The implementation of this embodiment will be described in detail.

[0100] like Figure 5 As shown, this embodiment provides a system for implementing any of the methods in the above embodiments, including: a storage tank 400 for storing condensate gas; a core model 500 for storing a solid wax inhibitor to be tested; a condensate gas wax precipitation point testing device 600, including a pressure vessel for accommodating condensate gas treated with a solid wax inhibitor to be tested; a first pipeline 700 for connecting the storage tank 400 with the core model 500; and a second pipeline 800 for connecting the core model 500 with the pressure vessel.

[0101] The system provided in this embodiment also includes a thermostat, a first pressure gauge 501 and a control valve 900. Specifically, the control valve 900 is installed Figure 5 As shown on the second pipe 800; the first pressure gauge 501 can be installed Figure 5 The core model 500 shown in the figure can also be installed on the second pipeline 800 and located between the control valve 900 and the core model 500. The first pressure gauge 501 is used to monitor the pressure in the core model 500. The core model 500, the storage tank 400, the first pipeline 700 and the second pipeline 800 are all placed in a constant temperature box, and the constant temperature box is used to keep the condensate gas warm.

[0102] Specifically, the storage tank 400 may be a high-pressure resistant gas storage tank of any shape and structure.

[0103] The core model 500 may be one or more. When the core model 500 includes more than one, the first pipe 700 is installed with a first multi-way head, the second pipe 800 is installed with a second multi-way head, and both ends of each core model 500 are connected to the first multi-way head and the second multi-way head, respectively. In a specific example, there are three core models 500, and both the first multi-way head and the second multi-way head are four-way heads.

[0104] The condensate gas wax precipitation point test device 600 can be a visual PVT microscopic test device, and the visual PVT microscopic test device includes an observation window for observing the wax precipitation process. For example, a rectangular or circular observation window is provided on the housing of the PVT microscopic test device to observe whether wax is precipitated. Of course, it can also be a window for installing a microscope provided in the housing, so that the entire wax precipitation process can be observed more clearly through the microscope installed on the window. Of course, the condensate gas wax precipitation point test device 600 of the present embodiment can also be a rotational viscometer test device.

[0105] The first pipeline 700 can be any high-pressure pipeline, such as an alloy steel pressure-resistant pipeline or a carbon steel pressure-resistant pipeline. Similarly, the second pipeline 800 is similar to the first pipeline 700 and will not be described in detail herein.

[0106] Optionally, the condensate gas wax precipitation point test device further comprises a processor, the processor is used to record the temperature of the condensate gas treated with the solid wax inhibitor to be tested when wax is precipitated, and compare the temperature with a preset temperature. Specifically, the processor can be a computer operating system, or can also be a comparator.

[0107] Optional, such as Figure 6 As shown, the system provided in this embodiment also includes: a back pressure valve 801, a hand pump 802 and a second pressure gauge 803, the back pressure valve 801 is installed on the second pipeline 800, the hand pump 802 is installed and connected to the back pressure valve 801 through the third pipeline 804, and the second pressure gauge 803 is installed on the third pipeline 804, wherein the hand pump 802 is used to provide pressure to the back pressure valve 801.

[0108] Specifically, the back pressure valve 801 is used to accurately control the pressure in the core model 500, and the second pressure gauge 803 is installed on the third pipeline 804 to monitor the pressure in the third pipeline 804 to control the opening pressure of the back pressure valve, wherein the third pipeline 804 is similar to the first pipeline 700, and the details can be referred to the above description, which will not be repeated here.

[0109] The working process of the back pressure valve 801 and the hand pump 802 is described in detail below.

[0110] First, close the control valve 900 and set the opening pressure of the back pressure valve 801 to the preset pressure through the hand pump 802, and then inject the condensate gas in the storage tank 400 into the core model 500. When the pressure in the core model 500 reaches the preset pressure, the back pressure valve 801 is opened, and then the outlet valve of the storage tank 400 is closed to stop injecting condensate gas into the core model 500, so that the pressure in the core model 500 is maintained at the preset pressure.

[0111] Optional, such as Figure 7As shown, the system provided in this embodiment further includes a flow meter 701 and a drying pipe 702. The flow meter 701 and the drying pipe 702 are both installed on the first pipeline 700. Specifically, the drying pipe 702 can be located between the flow meter 701 and the storage tank 400. Of course, the flow meter 701 can also be located between the drying pipe 702 and the storage tank 400. The flow meter 701 is used to monitor the injection rate of the condensate gas into the core model 500. The injection rate can be any suitable value, for example, the injection rate can be 0.5 ml / min, or it can also be 1.0 ml / min. Different injection rates can also be used to inject condensate gas. In a specific example, a first injection rate and a second injection rate can be used, and the first injection rate is greater than the second injection rate. For example, the first injection rate is 2 ml / min, and the second injection rate is 0.5 ml / min. The condensate gas is injected at the first injection rate at the beginning, and then injected at the second injection rate after a period of time, that is, the condensate gas is slowly injected into the core model 500 in the later stage of injection. When the pressure in the core model 500 reaches the preset pressure, the back pressure valve 801 is immediately opened, and then the outlet valve of the storage tank 400 is closed. Since the second injection rate is relatively small, it is ensured that the pressure at various locations in the core model 500 is in a relatively balanced state in the later stage of injection, thereby further realizing the precise control of the pressure in the core model 500 and ensuring the accuracy and repeatability of the experiment.

[0112] The system provided in this embodiment can also measure the wax precipitation temperature of condensate gas that has not been treated with a solid wax inhibitor, that is, the condensate gas that has not been treated with a solid wax inhibitor can be directly injected into the condensate gas wax precipitation point testing device 600 for measurement. The specific method can refer to the above description; of course, the system provided in this embodiment can also measure the wax precipitation point of condensate gas that has been treated with different solid wax inhibitors to be tested. The specific method can refer to the above description.

[0113] The present embodiment provides a system for implementing any of the methods in the above embodiments, by uniformly filling the solid wax inhibitor to be tested in the core model, and then injecting the condensate gas in the storage tank into the core model through the first pipeline, and making the condensate gas and the solid wax inhibitor to be tested fully contact under the conditions of constant temperature, preset pressure and preset time; adjusting the condensate gas wax precipitation point testing device to the temperature of the formation where the condensate gas is located during gas production, and then injecting the condensate gas treated with the solid wax inhibitor to be tested into the condensate gas wax precipitation point testing device through the second pipeline, adjusting the pressure of the condensate gas wax precipitation point testing device to the preset pressure, adjusting the temperature of the condensate gas wax precipitation point testing device under the preset pressure until the condensate gas treated with the solid wax inhibitor to be tested begins to precipitate wax, recording the temperature of the condensate gas treated with the solid wax inhibitor when wax is precipitated, and comparing the temperature with the preset temperature. When the temperature is less than the preset temperature, the solid wax inhibitor to be tested has an anti-wax effect. Therefore, the device provided in the present embodiment implements the above method for evaluating the anti-wax effect of the solid wax inhibitor, so that those skilled in the art can know the anti-wax effect of the solid wax inhibitor in the condensate gas well.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the anti-wax effect of a solid anti-wax agent, characterized in that: include: treating the condensate gas with a first solid wax inhibitor to be tested; The condensate gas treated with the first solid wax inhibitor to be tested is introduced into a pressure vessel, and the temperature of the pressure vessel is adjusted at a preset pressure until the condensate gas treated with the first solid wax inhibitor to be tested precipitates wax; the temperature of the condensate gas treated with the first solid wax inhibitor to be tested when wax is precipitated is recorded, and the temperature is compared with a preset temperature, wherein the preset pressure is the pressure of the formation where the condensate gas is located during gas production; When the temperature is lower than the preset temperature, the first solid wax inhibitor to be tested has an anti-wax effect; The condensate gas is introduced into the pressure vessel, and the temperature of the pressure vessel is adjusted at the preset pressure until the condensate gas is waxed, and the temperature when the condensate gas is waxed is recorded as the preset temperature.

2. The method for evaluating the anti-wax effect of a solid anti-wax agent according to claim 1, characterized in that: Also includes: The condensate gas is prepared.

3. The method for evaluating the anti-wax effect of a solid anti-wax agent according to claim 2, wherein: The preparation of the condensate gas specifically includes: Prepare single degassing; The degassing gas and crude oil are mixed according to a preset volume ratio to obtain the condensate gas.

4. The method for evaluating the anti-wax effect of a solid anti-wax agent according to any one of claims 1 to 3, characterized in that: Also includes: Treating the condensate gas with a second solid paraffin inhibitor to be tested; Passing the condensate treated with the second solid wax inhibitor to be tested into a pressure vessel, and adjusting the temperature of the pressure vessel at a preset pressure until the condensate treated with the second solid wax inhibitor to be tested is waxed; Recording the temperature of the condensate gas treated with the second solid wax inhibitor to be tested when wax is precipitated, and comparing the temperature with the temperature of the condensate gas treated with the first solid wax inhibitor to be tested when wax is precipitated; When the temperature at which wax is precipitated from the condensate gas treated with the first solid wax inhibitor to be tested is lower than the temperature at which wax is precipitated from the condensate gas treated with the second solid wax inhibitor to be tested, the anti-wax effect of the first solid wax inhibitor to be tested is greater than that of the second solid wax inhibitor to be tested.

5. A system for implementing the method for evaluating the anti-wax effect of a solid anti-wax agent according to any one of claims 1 to 4, characterized in that: include: Storage tanks for storing condensate gas; Core model, used to store the solid wax inhibitor to be tested; A condensate gas wax precipitation point testing device comprises a pressure vessel for containing the condensate gas treated with the solid wax inhibitor to be tested; a first pipeline, used to connect the storage tank with the core model; The second pipeline is used to connect the core model with the pressure container.

6. The system according to claim 5, characterized in that The condensate gas wax precipitation point testing device also includes a processor, which is used to record the temperature of the condensate gas treated with the solid wax inhibitor to be tested when wax is precipitated, and compare the temperature with a preset temperature.

7. The system according to claim 5, characterized in that It also includes a back-pressure valve, a hand pump, and a pressure gauge, wherein the back-pressure valve is installed on the second pipeline, the hand pump is connected to the back-pressure valve through a third pipeline, and the pressure gauge is installed on the third pipeline, wherein the hand pump is used to provide pressure to the back-pressure valve.

8. The system according to claim 5, characterized in that It also includes a flow meter and a drying pipe, and the flow meter and the drying pipe are both installed on the first pipeline.

9. The system according to claim 5, characterized in that The condensate gas wax point testing device is a visual PVT microscopic testing device, or a rotational viscometer testing device.

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