Device for detecting paraffin removal effect of in-situ oil sand

Abstract

The present invention relates to the technical field of oil exploration, and provides a device for detecting the effect of paraffin removal from in-situ oil sands. The device includes: a box body; a first container for containing a paraffin removal reagent, with a heating device provided on the outer side of the first container; a second container having sieve holes formed on its surface, the second container being placed inside the first container and used for containing a wax sample; a measuring device including a weight measuring unit and a time measuring unit, the weight measuring unit being used to measure the weight change of the wax sample, and the time measuring unit being used to measure the experimental time; a calculation device for calculating the wax dissolution rate based on the obtained experimental time and weight change, capable of measuring the wax dissolution rate of the in-situ wax sample in real time; no processing of the wax sample is required; no manual observation and measurement are needed, the measurement is more accurate, the labor cost is reduced, and the mechanization level of in-situ measurement is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil exploration, and particularly to a device for detecting the effect of paraffin removal from in-situ oil sands. Background Art

[0002] In the oil industry, "paraffin wax deposition" is a common problem in oil well production and crude oil pipeline transportation. During the flow of crude oil in the wellbore or pipeline, wax deposition may occur as the temperature and pressure decrease. After the occurrence of wax deposition, it will block the oil-producing formation, reduce the oil well output, increase the oil well load, cause production accidents, and at the same time affect the transportation capacity of the pipeline, and even block the pipeline, increasing the difficulty of crude oil pipeline transportation. Therefore, the paraffin removal and prevention technology is an important research content in oilfield production and transportation.

[0003] Currently, the commonly used paraffin removal methods are mainly divided into three categories: mechanical paraffin removal, thermal paraffin removal, and chemical paraffin removal. Among them, the chemical paraffin removal and prevention technology is popular and widely used due to its wide adaptability, high efficiency, and simple operation process. Liquid paraffin removal and prevention agents are divided into oil-soluble, water-soluble, and emulsion types. These liquid paraffin removal and prevention agents are usually prepared with organic solvents, surfactants, water, or emulsifiers, polymers, etc. The component compositions of different paraffin removal and prevention agents are different. When developing a new paraffin removal and prevention agent, it is first necessary to measure the wax dissolution rate and wax dissolution amount of the main wax-dissolving solvent. Before the paraffin removal and prevention agent is put into use, it is also necessary to evaluate the wax dissolution effect. The most commonly used measurement device and method are as follows: Under normal pressure, a certain amount of a certain solvent is introduced into a stoppered test tube, the experimental temperature is maintained by means of a water bath, then wax balls are added, the test tube is stoppered, and the wax dissolution rate of the solvent is obtained by measuring the time required for the wax balls to dissolve completely and calculating the ratio of the wax ball mass to the time.

[0004] However, the above method is not suitable for in-situ detection in oil refineries. When testing, a stopwatch is needed to record the time, and the data recording is inaccurate; before testing, the wax sample needs to be made into wax balls, and the testing steps are complex; when testing, the temperature of the paraffin removal agent in the beaker needs to be measured, and the thermometer reading is inaccurate, and manual observation of the thermometer is required, wasting manpower. More importantly, the existing paraffin dissolution rate method can only observe the final dissolution time of the wax sample and calculate the average dissolution rate, but cannot obtain the real-time paraffin dissolution rate of the paraffin removal agent for the wax sample in a certain time period, and cannot provide better guidance for in-situ application in oilfields. Summary of the Invention

[0005] The present invention provides a device for detecting the paraffin removal effect of on-site oil sand, which is used to solve the defects of the existing experimental methods for testing the paraffin removal effect, such as complex testing steps, inaccurate test data, waste of manpower, and inability to measure the wax dissolution rate in real time. The device for detecting the paraffin removal effect of on-site oil sand according to the present invention can be used for measuring the paraffin removal effect at the oil factory site, with simple measurement steps, accurate testing, and the ability to measure the wax dissolution rate in real time, reducing manpower consumption.

[0006] The present invention provides a device for detecting the paraffin removal effect of on-site oil sand, comprising:

[0007] A box body;

[0008] A first container, which is fixed inside the box body and is used for containing a paraffin removal reagent, and a heating device is arranged outside the first container;

[0009] A second container, the surface of which forms sieve holes, and the second container is placed inside the first container and is used for containing a wax sample;

[0010] A measuring device, which includes a weight measuring unit and a time measuring unit. The weight measuring unit is connected to the second container and is used for measuring the weight change of the wax sample, and the time measuring unit is used for measuring the experimental time;

[0011] A calculation device, which is electrically connected to the time measuring unit and the weight measuring unit respectively, and is used for calculating the wax dissolution rate based on the obtained experimental time and weight change.

[0012] According to the device for detecting the paraffin removal effect of on-site oil sand provided by the present invention, it further includes a first rod and a second rod connected to each other. The first end of the first rod is fixed to the side wall of the box body, the second end of the first rod is connected to the first end of the second rod, and the second end of the second rod is connected to the top of the second container; the weight measuring unit is arranged at the connection of the first rod and the second rod.

[0013] According to the device for detecting the paraffin removal effect of on-site oil sand provided by the present invention, a first positioning block is further arranged on the upper surface of the first rod, and a second positioning block adapted to the first positioning block is arranged on the lower surface of the second rod. The first rod and the second rod are positioned by the matching of the first positioning block and the second positioning block.

[0014] According to the device for detecting the paraffin removal effect of on-site oil sand provided by the present invention, the first rod is formed with a groove for the second rod to insert, and a first buckle structure is arranged above the groove, and a limiting structure for the second rod is formed through the groove and the first buckle structure.

[0015] A device for detecting the paraffin removal effect of in-situ oil sand according to the present invention further includes a mounting bracket fixed inside the box body. The mounting bracket includes a first bracket and a second bracket that are arranged in half. A first through hole is formed between the first bracket and the second bracket to support the first container.

[0016] A device for detecting the paraffin removal effect of in-situ oil sand according to the present invention, the second container is a hollow sphere with a sieve hole structure. One end of the hollow sphere has an opening and closing part, and a second buckle structure for locking the closed state is arranged on the opening and closing part.

[0017] A device for detecting the paraffin removal effect of in-situ oil sand according to the present invention, the measuring device further includes a temperature measuring unit for measuring the temperature of the paraffin removal reagent in the first container.

[0018] A device for detecting the paraffin removal effect of in-situ oil sand according to the present invention, the heating device includes a medium pipeline, a heating tank and a heating pipe. The heating tank is fixed inside the box body, the heating pipe is arranged at the bottom of the heating tank, and the medium pipeline is communicated with the inside of the heating tank.

[0019] A device for detecting the paraffin removal effect of in-situ oil sand according to the present invention further includes a first cover plate and a second cover plate that are arranged in half. The first cover plate and the second cover plate respectively cover the top of the heating tank, and a second through hole is formed between the first cover plate and the second cover plate to allow the second container to pass through.

[0020] A device for detecting the paraffin removal effect of in-situ oil sand according to the present invention, a heat insulation layer is arranged outside the heating tank.

[0021] A device for detecting the paraffin removal effect of in-situ oil sand provided by the present invention uses the box body to provide an in-situ detection environment, uses the first container to hold the paraffin removal reagent, uses the second container to hold the wax sample, realizes the dissolution of the wax sample through the sieve holes on the second container, uses the measuring device to measure the weight change of the wax sample and the dissolution time of the wax sample, and uses the calculation device to calculate the real-time dissolution rate of the wax sample. By using the device for detecting the paraffin removal effect of in-situ oil sand of the present invention, it can measure the dissolution rate of the wax sample in-situ in real time; and it can directly hold the wax sample in the second container without processing the wax sample; it can also use this device to automatically measure without manual observation and measurement, the measurement is more accurate, the labor cost is reduced, and the mechanization level of in-situ measurement is improved. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of a device provided by the present invention for detecting the paraffin removal effect of on-site oil sand;

[0024] Figure 2 It is a schematic structural diagram of a screen tennis ball body, a second rod and a second positioning block provided by the present invention;

[0025] Figure 3 It is a top view structural diagram of the second end of the first rod provided by the present invention;

[0026] Figure 4 is Figure 3 a schematic left end face structural diagram of the limit structure in;

[0027] Figure 5 It is a schematic structural diagram of a first cover plate and a second cover plate provided by the present invention;

[0028] Figure 6 It is a schematic structural diagram of a screen tennis ball body provided by the present invention and a second buckle structure arranged thereon;

[0029] Reference numerals:

[0030] 1: box body; 2: beaker; 3: screen tennis ball body; 4: weight sensor; 5: computer; 6: temperature sensor; 7: first rod; 8: second rod; 9: first positioning block; 10: second positioning block; 11: first buckle structure; 12: mounting bracket; 13: second buckle structure; 14: heating tank; 15: medium pipeline; 16: heating pipe; 17: first cover plate; 18: second cover plate. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0032] The following will be combined with Figures 1-6Describe a device for detecting the paraffin removal effect of in-situ oil sand. The device for detecting the paraffin removal effect of in-situ oil sand includes: a box body 1, a first container, a second container, measuring equipment arranged inside the box body 1, and a computing device arranged outside the box body 1. Among them, the box body 1 provides the installation positions of the first container, the second container and the measuring equipment, and is used to provide a suitable measuring environment, etc.

[0033] Among them, the first container is fixed inside the box body 1. The first container is used to hold the paraffin removal reagent, and a heating device is arranged outside the first container. The paraffin removal reagent in the first container can be heated through the heating device to about 45 degrees Celsius, which is a suitable temperature environment for the test. Various heating methods can be adopted. Generally, in order to ensure the heating effect, the water bath method can be adopted. In the following embodiments, the first container adopts a beaker 2 or a heatable container.

[0034] Sieve holes are formed on the surface of the second container. The second container is placed inside the first container. The second container is used to hold the wax sample. The size of the second container is smaller than that of the first container and can be placed in the first container. Through the sieve holes, the wax sample inside can be in full contact with the paraffin removal reagent in the first container, and the weight measurement unit can be used to weigh the mass change of the wax sample in real time. Generally speaking, the second container can adopt a hollow sphere and an openable structure. The wax sample is placed in the second container and fastened, and then placed in the first container.

[0035] The measuring equipment includes a weight measurement unit and a time measurement unit. The weight measurement unit is connected to the second container and is used to measure the weight change of the wax sample. The time measurement unit is used to measure the experimental time; the computing device is electrically connected to the time measurement unit and the weight measurement unit respectively, and is used to calculate the wax dissolution rate based on the obtained experimental time and weight change. It should be understood that the weight measurement unit measures the total mass of the second container and the wax sample inside. During the wax dissolution process of the wax sample, its weight will change, and this weight change is measured and recorded by the weight measurement unit. In this embodiment, both the time measurement unit and the computing device can be implemented by a computer 5, which has the function of recording the experimental time and calculating the wax dissolution rate. The computer 5 receives the data from the weight measurement unit, combines the experimental time of the wax dissolution process, and calculates the real-time wax dissolution rate, so as to provide good technical guidance for on-site oilfield applications. It can be understood that the computer 5 can be connected to the above-mentioned weight measurement unit through a USB interface and a data connection wire, and the real-time wax dissolution rate is calculated through the software inside the computer 5.

[0036] A device for detecting the paraffin removal effect of in-situ oil sands provided by the present invention uses a box body 1 to provide an in-situ detection environment, uses a first container to hold a paraffin removal reagent, uses a second container to hold a wax sample, realizes the dissolution of the wax sample through the sieve holes on the second container, uses a measuring device to measure the weight change of the wax sample and the wax dissolution time of the wax sample, and uses a computing device to calculate the real-time wax dissolution rate of the wax sample. By using the device for detecting the paraffin removal effect of in-situ oil sands of the present invention, the wax dissolution rate of the wax sample on site can be measured in real time; and the second container can be directly used to hold the wax sample without processing the wax sample; and the device can also be used for automatic measurement without manual observation and measurement, the measurement is more accurate, the labor cost is reduced, and the mechanization level of on-site measurement is improved.

[0037] In one embodiment of the present invention, the device for detecting the paraffin removal effect of in-situ oil sands further includes a connected first rod 7 and a second rod 8. The first end of the first rod 7 is fixed to the side wall of the box body 1, the second end of the first rod 7 is connected to the first end of the second rod 8, and the second end of the second rod 8 is connected to the top of the second container; a weight measurement unit is arranged at the connection of the first rod 7 and the second rod 8. In this embodiment, the weight measurement unit can adopt a relatively sensitive weight sensor 4, which is installed at the second end of the first rod 7. The second rod 8 is connected to the second container, and the mass change of the wax sample in the second container will be transmitted to the weight sensor 4 through the second rod 8, so as to monitor the mass change of the wax sample.

[0038] In one embodiment of the present invention, a first positioning block 9 is further provided on the upper surface of the first rod 7, and a second positioning block 10 adapted to the first positioning block 9 is provided on the lower surface of the second rod 8. The first rod 7 and the second rod 8 are positioned and matched through the first positioning block 9 and the second positioning block 10. In this embodiment, the first rod 7 and the second rod 8 are positioned and installed through two positioning blocks, which is convenient for their butt joint. Preferably, the first positioning block 9 can be a groove structure, and the second positioning block 10 can be a convex structure, and the two form a female head structure and a male head structure for insertion. Of course, the shapes of the first positioning block 9 and the second positioning block 10 are the same, preferably Figure 2 and Figure 3 the circular structure in

[0039] In one embodiment of the present invention, as Figure 4As shown, a limiting structure is provided at the second end of the first rod 7. The first rod 7 is formed with a groove for inserting the second rod 8. Above the groove, a first snap structure 11 is provided. The first snap structure 11 and the groove form a limiting structure for the second rod 8. In this embodiment, in order to prevent the second positioning block 10 from falling off the first positioning block 9, a limiting structure is used to press the second rod 8 in the groove of the first rod 7, and the two positioning blocks in the above embodiment are used to realize the positioning of the first rod 7 and the second rod 8. Specifically, the limiting structure is jointly realized by the first snap structure 11 and the groove. The second rod 8 is limited in the groove of the first rod 7 by the first snap structure 11. It should be understood that although the first snap structure 11 is used to prevent the second rod 8 from coming out, the first snap structure 11 does not prevent the weight sensor 4 from normally monitoring the quality change of the wax sample. That is, the first snap structure 11 is not tightly pressed on the second rod 8. The gap between its groove and the first snap structure 11 is greater than the thickness of the second rod 8, but this gap is less than the thickness of the groove structure of the first positioning block 9. To ensure that the second positioning block 10 does not come out of the first positioning block 9, the second rod 8 can still move up and down within the limiting structure, so that the weight sensor 4 can be used to monitor the quality change of the wax sample. The weight sensor 4 in this embodiment can adopt a spring type weight sensor 4.

[0040] In one embodiment of the present invention, the device for detecting the wax removal effect of on-site oil sand further includes a mounting bracket 12 fixed in the box body 1. The mounting bracket 12 includes a first bracket and a second bracket that are arranged in half. A first through hole is formed between the first bracket and the second bracket to support the first container. In this embodiment, the diameter of the first through hole formed by the first bracket and the second bracket is greater than the outer diameter of the first container, but less than the upper end flare diameter of the first container. The first container adopts the form of a beaker 2, and the flared part at the upper end is supported on the edge of the first through hole to provide support for the first container.

[0041] In one embodiment of the present invention, as Figure 6 shown, the second container is a hollow sphere with a sieve hole structure. One end of the hollow sphere has an opening and closing part, and a second snap structure 13 for locking the closed state is provided on the opening and closing part. In this embodiment, the above-mentioned hollow sphere with a sieve hole structure is named a "sieve tennis ball". The diameter of the sieve tennis ball 3 is 2 cm, and its surface is formed with sieve holes. The number of sieve holes is at least 500 mesh to prevent the wax sample from passing through the sieve holes. As Figure 6 shown, the sieve tennis ball 3 has a hinge structure and can be opened and closed. After the sieve tennis ball 3 is opened, wax samples can be placed inside it. Then, the sieve tennis ball 3 is closed, and the second snap structure 13 is used to close and lock the opening of the sieve tennis ball 3.

[0042] In one embodiment of the present invention, the measuring device further includes a temperature measuring unit for measuring the temperature of the paraffin removal reagent in the first container. Specifically, the temperature measuring unit in this embodiment uses a temperature sensor 6, which is provided with a corresponding display module on the box body 1 and can display the measured temperature. A groove body is arranged inside the box body 1, and foam is filled in the groove body. Placing the temperature measuring unit in the foam can prevent the temperature probe from being damaged outside. The temperature probe can be taken out and used to measure the temperature in the beaker 2. Adjust the heating device according to the displayed temperature to ensure that the paraffin removal reagent in the beaker 2 always remains at 45 degrees Celsius.

[0043] In one embodiment of the present invention, the heating device includes a medium pipeline 15, a heating tank 14, and a heating pipe 16. The heating tank 14 is fixed inside the box body 1, the heating pipe 16 is arranged at the bottom of the heating tank 14, and the medium pipeline 15 is communicated with the inside of the heating tank 14. In this embodiment, the heating medium can be fluids such as distilled water and tap water. The heating pipe 16 heats the heating medium, and the first container can be heated by the water bath method. The medium pipeline 15 is used to input the heating medium, and the heating medium can be recycled by using a water pump. The heating tank 14 is made of stainless steel.

[0044] In one embodiment of the present invention, as Figure 5 shown, the device for detecting the paraffin removal effect of on-site oil sand further includes a first cover plate 17 and a second cover plate 18 which are arranged in a split manner. The first cover plate 17 and the second cover plate 18 respectively cover the top of the heating tank 14, and a second through hole is formed between the first cover plate 17 and the second cover plate 18 for the second container to pass through. In this embodiment, by covering the heating tank 14 with a cover plate, the evaporation of the paraffin removal reagent and moisture can be reduced, and a second through hole for the second container to pass through is opened on the cover plate, so that the second container can be taken out through the second through hole.

[0045] In one embodiment of the present invention, a heat insulation layer is arranged outside the heating tank 14, and the heat insulation layer can adopt a foam sandwich to improve the heat insulation performance.

[0046] Furthermore, for the device for detecting the paraffin removal effect of on-site oil sand in this embodiment, a device switch is arranged on the box body 1, which has a heating switch for controlling the heating device, a temperature switch for controlling the temperature sensor 6, and a water pump switch for controlling the water pump.

[0047] Based on the above embodiments, the usage method of the device for detecting the paraffin removal effect of on-site oil sand provided by the present invention is as follows:

[0048] Remove the sieve ball body 3 and pour the paraffin removal reagent into the beaker 2;

[0049] After connecting the power cord, first add fluid to a depth of 2 / 3 of the heating tank 14, turn on the heating switch and the temperature switch, place the temperature sensor 6 into the heating tank 14, and after the temperature reaches 45 °C;

[0050] Place the beaker 2 containing the paraffin removal reagent on the mounting bracket 12, place the temperature sensor 6 into the beaker 2, and after the temperature in the beaker 2 also reaches 45 °C, place the paraffin sample to be tested into the screen ball body 3, close the screen ball body 3, and fasten the second buckle structure 13;

[0051] Place the second rod 8 on the first rod 7, align the first positioning block 9 with the second positioning block 10 for insertion, fasten the first buckle structure 11, and fasten the first cover plate 17 and the second cover plate 18 above the heating tank 14;

[0052] The computer 5 receives the data of the weight sensor 4 in real time and compares it with the experimental time, calculates the real-time wax melting rate, and thus reflects the paraffin removal effect.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for detecting the paraffin removal effect of in-situ oil sand, characterized in that, it includes: a box body; a first container, which is fixed inside the box body, and is used for containing paraffin removal reagent, and a heating device is arranged outside the first container; a second container, the surface of which forms sieve holes, and the second container is placed inside the first container and is used for containing wax samples; a measuring device, the measuring device includes a weight measuring unit and a time measuring unit, the weight measuring unit is connected to the second container and is used for measuring the weight change of the wax sample, and the time measuring unit is used for measuring the experimental time; a calculating device, the calculating device is electrically connected to the time measuring unit and the weight measuring unit respectively, and is used for calculating the wax dissolving rate through the obtained experimental time and weight change; it further includes a connected first rod and a second rod, the first end of the first rod is fixed to the side wall of the box body, the second end of the first rod is connected to the first end of the second rod, and the second end of the second rod is connected to the top of the second container, and the weight measuring unit is arranged at the connection of the first rod and the second rod; a first positioning block is further arranged on the upper surface of the first rod, and a second positioning block adapted to the first positioning block is arranged on the lower surface of the second rod, and the first rod and the second rod are positioned by matching the first positioning block and the second positioning block; the first rod is formed with a groove for the second rod to insert, and a first buckle structure is arranged above the groove, and a limiting structure for the second rod is formed through the groove and the first buckle structure, the gap between the groove and the first buckle structure is greater than the thickness of the second rod, and the gap is less than the thickness of the groove structure of the first positioning block.

2. The device for detecting the paraffin removal effect of in-situ oil sand according to claim 1, characterized in that, it further includes a mounting bracket fixed inside the box body, the mounting bracket includes a first bracket and a second bracket which are arranged in half, and a first through hole is constructed between the first bracket and the second bracket to support the first container.

3. The device for detecting the paraffin removal effect of in-situ oil sand according to claim 1, characterized in that, the second container is a hollow sphere with a sieve hole structure, one end of the hollow sphere has an opening and closing part, and a second buckle structure for locking the closed state is arranged on the opening and closing part.

4. The device for detecting the paraffin removal effect of in-situ oil sand according to claim 1, characterized in that, the measuring device further includes a temperature measuring unit, and the temperature measuring unit is used for measuring the temperature of the paraffin removal reagent in the first container.

5. The device for detecting the paraffin removal effect of in-situ oil sand according to any one of claims 1 to 4, characterized in that, the heating device includes a medium pipeline, a heating tank and a heating pipe, the heating tank is fixed inside the box body, the heating pipe is arranged at the bottom of the heating tank, and the medium pipeline is communicated with the inside of the heating tank.

6. The device for detecting the paraffin removal effect of in-situ oil sand according to claim 5, characterized in that, It further includes a first cover plate and a second cover plate which are arranged in a split manner, the first cover plate and the second cover plate respectively cover the top of the heating tank, and a second through hole is formed between the first cover plate and the second cover plate for the second container to pass through.

7. The device for detecting the paraffin removal effect of in-situ oil sand according to claim 5, characterized in that, a heat insulation layer is arranged outside the heating tank.

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