Dynamic simulation test device for oil field paraffin control pipeline

Abstract

The utility model relates to the technical field of oil field pipelines, in particular to a dynamic simulation test device for an oil field paraffin control pipeline, which comprises a first oil storage tank, a second oil storage tank, a metering pump, a thermostat and a test pipe group. A second oil conveying pipe is communicated between an outlet of the metering pump and an inlet of the testing pipe set, a third oil conveying pipe is communicated between an outlet of the testing pipe set and an inlet of the second oil storage tank, and a circular gear flowmeter, a first pressure transmitter, a first pressure gauge and a first thermometer are sequentially and fixedly installed on the second oil conveying pipe in the material flowing direction. And a second thermometer, a second pressure gauge and a second pressure transmitter are sequentially and fixedly mounted on the third oil conveying pipe in the material flowing direction. By simulating the dynamic paraffin precipitation process of the paraffin control pipeline, the paraffin accumulation amount in the pipeline under different working conditions is measured, so that the formulation of a paraffin control scheme of the pipeline is accurately guided, and the device has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field pipelines and is a dynamic simulation test device for oil field wax prevention pipelines. Background Art

[0002] The crude oil produced by most oil fields in my country has the characteristics of high freezing point and high wax content. During the transportation of waxy crude oil, the oil temperature gradually decreases, and the solubility of the wax contained in it gradually decreases. When the oil temperature drops to the wax precipitation point, the wax contained in the crude oil begins to crystallize and precipitate, and moves to the pipe wall and deposits on the pipe wall driven by factors such as temperature difference and concentration gradient. A large amount of wax deposition on the pipe wall will reduce the pipeline flow area, increase the delivery pressure, reduce the pipeline delivery capacity, increase the frequency of cleaning, reduce the safe stop time of crude oil, and may even cause wax blockage accidents, threatening the safe operation of the pipeline. Therefore, studying the wax deposition law of waxy crude oil pipelines is extremely important for guiding the production and transportation of pipelines.

[0003] Among the existing related technologies, commonly used detection methods include polarizing microscopy, laser method, viscosity method, differential scanning calorimetry, ultrasonic method, cold finger method, conductivity method, etc. These methods can only test the wax precipitation temperature of wax, but cannot obtain the wax precipitation and wax deposition characteristics of crude oil after flowing in the pipeline.

[0004] In the field of oil and gas extraction, when wax-containing fluid flows in a pipeline, the wax in it will precipitate and deposit in the pipeline. The deposition of wax will increase the load on the oil well, cause the pipeline to become thinner, cause the oil well to reduce production, and reduce the service life of the rod and pipe. Therefore, it is necessary to detect the deposition effect of wax in the pipeline and effectively detect the wax content in the oil sample, so as to accurately use the type and amount of reagents. Summary of the invention

[0005] The utility model provides a dynamic simulation test device for oilfield anti-wax pipeline, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem that the existing oil pipeline wax deposition test cannot obtain the characteristics of wax precipitation and wax deposition of crude oil after flowing in the pipeline.

[0006] The technical scheme of the utility model is realized through the following measures: a dynamic simulation test device for oilfield wax prevention pipeline, comprising a first oil storage tank, a second oil storage tank, a metering pump, a thermostat and a test tube group, a first oil pipeline is fixedly connected between the outlet of the first oil storage tank and the inlet of the metering pump, a second oil pipeline is connected between the outlet of the metering pump and the inlet of the test tube group, a third oil pipeline is connected between the outlet of the test tube group and the inlet of the second oil storage tank, a circular gear flow meter, a first pressure transmitter, a first pressure gauge and a first thermometer are fixedly installed in sequence on the second oil pipeline along the material flow direction, a second thermometer, a second pressure gauge and a second pressure transmitter are fixedly installed in sequence on the third oil pipeline along the material flow direction, a constant temperature box or a constant temperature bath is arranged in the thermostat, and the test tube group is placed in the constant temperature box or the constant temperature bath.

[0007] According to actual needs, the above oilfield wax prevention pipeline dynamic simulation test device can be further optimized and / or improved:

[0008] The above-mentioned oilfield wax prevention pipeline dynamic simulation test device also includes a data analysis controller, and the circular gear flow meter, the first pressure transmitter, the first pressure gauge, the first thermometer, the second thermometer, the second pressure gauge, the second pressure transmitter, the control end of the metering pump and the control end of the thermostat are all electrically connected to the data analysis controller.

[0009] A connecting pipeline is fixedly connected between the first oil storage tank and the second oil storage tank, and valves are fixedly installed on the second oil pipeline between the circular gear flowmeter and the first pressure transmitter, the third oil pipeline between the second pressure transmitter and the second oil storage tank, and the connecting pipeline.

[0010] The test tube set comprises a test tube and a reference tube, and the test tube and the reference tube are connected in parallel.

[0011] The utility model has a reasonable and compact structure and is easy to use. It simulates the dynamic wax deposition process of anti-wax pipelines and utilizes the control of water content, flow rate and temperature in the simulated pipeline to realize the determination of wax accumulation amount in the pipeline under different working conditions, thereby accurately guiding the addition of agents in the pipeline and the selection of pipeline coatings. It has the characteristics of safety, labor saving, simplicity and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 This is a schematic diagram of the process flow of the utility model.

[0013] The codes in the accompanying drawings are: 1 is the first oil storage tank, 2 is the second oil storage tank, 3 is the metering pump, 4 is the thermostat, 5 is the test tube group, 6 is the first oil pipeline, 7 is the second oil pipeline, 8 is the third oil pipeline, 9 is the circular gear flow meter, 10 is the first pressure transmitter, 11 is the first pressure gauge, 12 is the first thermometer, 13 is the second thermometer, 14 is the second pressure gauge, 15 is the second pressure transmitter, 16 is the data analysis controller, 17 is the connecting pipeline, and 18 is the valve. DETAILED DESCRIPTION

[0014] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0015] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the

[0017] The present invention is further described below in conjunction with the embodiments and drawings:

[0018] Embodiment 1: As attached Figure 1 As shown, the oilfield wax prevention pipeline dynamic simulation test device includes a first oil storage tank 1, a second oil storage tank 2, a metering pump 3, a thermostat 4 and a test tube group 5. A first oil pipeline 6 is fixedly connected between the outlet of the first oil storage tank 1 and the inlet of the metering pump 3, a second oil pipeline 7 is connected between the outlet of the metering pump 3 and the inlet of the test tube group 5, and a third oil pipeline 8 is connected between the outlet of the test tube group 5 and the inlet of the second oil storage tank 2. A circular gear flowmeter 9, a first pressure transmitter 10, a first pressure gauge 11 and a first thermometer 12 are fixedly installed on the second oil pipeline 7 in sequence along the material flow direction, and a second thermometer 13, a second pressure gauge 14 and a second pressure transmitter 15 are fixedly installed on the third oil pipeline 8 in sequence along the material flow direction. A constant temperature box or a constant temperature bath is arranged in the thermostat 4, and the test tube group 5 is placed in the constant temperature box or the constant temperature bath.

[0019] According to actual needs, the above oilfield wax prevention pipeline dynamic simulation test device can be further optimized and / or improved:

[0020] Embodiment 2: It is different from Embodiment 1 in that: Figure 1As shown, the oilfield wax prevention pipeline dynamic simulation test device also includes a data analysis controller 16, and the circular gear flow meter 9, the first pressure transmitter 10, the first pressure gauge 11, the first thermometer 12, the second thermometer 13, the second pressure gauge 14, the second pressure transmitter 15, the control end of the metering pump 3 and the control end of the thermostat 4 are all electrically connected to the data analysis controller 16. The data analysis controller 16 can be a PLC controller.

[0021] Embodiment 3: It differs from Embodiment 1 to Embodiment 2 in that: Figure 1 As shown, a connecting pipeline 17 is fixedly connected between the first oil storage tank 1 and the second oil storage tank 2, and valves 18 are fixedly installed on the second oil pipeline 7 between the circular gear flowmeter 9 and the first pressure transmitter 10, the third oil pipeline 8 between the second pressure transmitter 15 and the second oil storage tank 2, and the connecting pipeline 17.

[0022] Embodiment 4: It differs from Embodiments 1 to 3 in that: Figure 1 As shown, the test tube group 5 includes a test tube and a reference tube, and the test tube and the reference tube are connected in parallel. The test tube and the reference tube are both made of stainless steel pressure-resistant hollow tubes, and are connected to the second oil pipeline 7 or the third oil pipeline 8 by a quick connector. When a simulation test is required, multiple test tubes and reference tubes can be connected in parallel to perform tests simultaneously.

[0023] As required, valves and instruments are fixedly installed on each pipeline of the oilfield wax prevention pipeline dynamic simulation test device to enable its normal operation.

[0024] During the dynamic simulation test operation of the oil field anti-wax pipeline, the test tube and the reference tube with different coating types on the inner surface are first connected in the form of a quick connector straight-through and a tee, and placed in a thermostatic bath or a thermostatic box. A water bath can be used for constant temperature and temperature control. The test temperature is controlled by the water bath to achieve the test of different wax deposition amounts at different temperatures. When the temperature of the pipe wall is lower than the wax precipitation temperature of the oil product, wax deposition will occur in the test pipe section, and wax molecules will appear and be adsorbed on the pipe wall, thereby reducing the inner diameter of the test tube and the reference tube, and increasing the pressure difference at both ends of the test tube and the reference tube. Pressure, temperature, flow display and regulation are realized by a data analysis controller 16, and the parameters of flow, temperature, and pressure are adjusted, data are collected, and the measurement of wax deposition amounts under different parameters is realized by a data calculation program. A communication module can also be added to achieve wireless transmission and reception of data.

[0025] The test can be carried out according to the following steps:

[0026] Step 1: Pour the oil sample from the oil well selected for the test into the first oil storage tank 1 (the water content can be adjusted as needed);

[0027] Step 2: Remove the test tube and reference tube to measure thickness and weigh, connect the pipelines, and place the test tube and reference tube in a water bath;

[0028] Step 3: Open the water bath and adjust it to the temperature required for the test, so that the oil sample reaches the temperature required for the test, open the circular gear flowmeter 9 and adjust it to the required flow; adjust the flow of the metering pump 3;

[0029] Step 4: Confirm that all valves 18 are in the open state and start the metering pump 3;

[0030] Step 5: Observe the flow rate through the circular gear flowmeter 9; observe the temperature through the first thermometer 12 and the second thermometer 13 to ensure consistency with the test plan and reduce errors;

[0031] Step 6: After the test, turn off the metering pump 3 and each instrument, remove the test tube and the reference tube, weigh them, and measure their thickness. According to the test results, select the optimal ratio of oil sample properties and coating type to achieve the selection of the optimal anti-wax solution for different blocks.

[0032] To sum up, the utility model has a reasonable and compact structure for the dynamic simulation test device for oilfield anti-wax pipelines, is easy to use, effectively simulates the wax deposition state of the oil pipe, realizes the determination of the wax accumulation amount in the pipeline under different working conditions, improves the accuracy of the detection, and is convenient for on-site implementation. The utility model has the characteristics of high degree of automation, high reliability, labor-saving, high efficiency and safety.

[0033] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A dynamic simulation test device for oilfield wax prevention pipeline, characterized in that It includes a first oil storage tank, a second oil storage tank, a metering pump, a thermostat and a test tube group. A first oil pipeline is fixedly connected between the outlet of the first oil storage tank and the inlet of the metering pump, a second oil pipeline is connected between the outlet of the metering pump and the inlet of the test tube group, and a third oil pipeline is connected between the outlet of the test tube group and the inlet of the second oil storage tank. A circular gear flowmeter, a first pressure transmitter, a first pressure gauge and a first thermometer are fixedly installed on the second oil pipeline in sequence along the material flow direction. A second thermometer, a second pressure gauge and a second pressure transmitter are fixedly installed on the third oil pipeline in sequence along the material flow direction. A constant temperature box or a constant temperature bath is arranged in the thermostat, and the test tube group is placed in the constant temperature box or the constant temperature bath.

2. The oilfield wax prevention pipeline dynamic simulation test device according to claim 1 is characterized in that It also includes a data analysis controller, and the circular gear flow meter, the first pressure transmitter, the first pressure gauge, the first thermometer, the second thermometer, the second pressure gauge, the second pressure transmitter, the control end of the metering pump and the control end of the thermostat are all electrically connected to the data analysis controller.

3. The oilfield wax prevention pipeline dynamic simulation test device according to claim 1 or 2, characterized in that A connecting pipeline is fixedly connected between the first oil storage tank and the second oil storage tank, and valves are fixedly installed on the second oil pipeline between the circular gear flowmeter and the first pressure transmitter, the third oil pipeline between the second pressure transmitter and the second oil storage tank, and the connecting pipeline.

4. The oilfield wax prevention pipeline dynamic simulation test device according to claim 1 or 2, characterized in that The test tube set comprises a test tube and a reference tube, and the test tube and the reference tube are connected in parallel.

5. The oilfield wax prevention pipeline dynamic simulation test device according to claim 3 is characterized in that The test tube set comprises a test tube and a reference tube, and the test tube and the reference tube are connected in parallel.

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