Sampling device and sampling method

Abstract

The invention relates to the technical field of liquid sampling devices, in particular to a sampling device and a sampling method.The sampling device comprises a valve element and a sampling pipe with an axial flow channel. The device is reasonable and compact in structure, convenient to use, simple and easy to operate, and in the sampling process, due to the fact that the atmospheric pressure outside the tank and the atmospheric pressure outside the sampling pipe are the same, and the pressure of each liquid layer in the tank is in direct proportion to the depth position of the liquid layer. When the valve core is in contact with the tank bottom, the oil in each liquid layer can be gradually pressed into the sampling pipe, namely, when the valve core is in contact with the tank bottom, the sampling pipe can record the oil in each liquid layer in the storage tank, full-section sampling of the liquid in the pipe is realized, the distribution consistency and continuity of an extracted sample and the liquid in the tank are good, the sampling precision and the sampling speed are effectively improved, the operation is simple and easy to realize, and the sampling efficiency is improved. The labor intensity of sampling operation is greatly reduced, and the device has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of liquid sampling devices, and relates to a sampling device and a sampling method. Background Art

[0002] In the process of oil and gas storage and transportation or ground metering, storage tanks are a common device for storing crude oil. In the process of oil and gas production, it is often necessary to sample and analyze water-containing crude oil. Due to the different densities of crude oil and water, when the water-containing crude oil is left in the storage tank for a period of time, the crude oil will show obvious stratification. The crude oil with lower density is located in the upper part of the storage tank, and the formation water with higher density is located in the lower part of the storage tank. At this time, if the sample is taken from the outlet at the bottom of the storage tank, the water content or density test results of the sample will seriously deviate from the actual value. To obtain a real sample representing the oil and water composition of crude oil, two points must be guaranteed: ① The sampling process will not cause severe disturbance of the crude oil in the storage tank; ② The sampler can fully obtain samples of oil and water at different strata. Taking full and accurate oil samples is an important task in the management of oil well data collection. Through the analysis and research of the collected oil samples, the physical properties of the oil well output fluid can be obtained, the water content of the oil well can be understood, and the changing laws of the oil well production and oil production can be mastered, which provides a scientific basis for the dynamic analysis of oil well production and management measures, and has important guiding significance for mastering the reservoir conditions and formulating production plans.

[0003] Therefore, the existing crude oil storage tank sampling devices and sampling methods such as stratification, segmentation, multiple sampling, and multiple analysis average calculation methods have the following shortcomings in actual use: the sampling device is complicated, the sampling continuity is poor and the sampling frequency is large, the extracted sample is very different from the liquid distribution in the tank, it is time-consuming and labor-intensive, and the sampling operation efficiency is low. Summary of the invention

[0004] The present invention provides a sampling device and a sampling method, which overcome the deficiencies of the above-mentioned prior art and can effectively solve the problems of the existing sampling device and sampling method, such as the complexity of the sampling device, poor sampling continuity and large variability, large number of sampling times, time-consuming and labor-intensive, and low sampling operation efficiency.

[0005] One of the technical solutions of the present invention is achieved through the following measures: a sampling device, including a valve core and a sampling tube with an axial flow channel, the inner side of the lower end of the sampling tube is sheathed together with the outer side of the upper part of the valve core, a liquid outlet opening upward is provided in the middle part of the upper side of the valve core, and at least two liquid inlets whose inner ends can be connected to the liquid outlet are evenly distributed along the circumference of the outer side of the middle part of the valve core.

[0006] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned device may also include an oil scraper, and an oil scraper capable of cleaning oil stains adhering to the outer wall of the sampling tube is slidably installed on the outer side of the sampling tube.

[0007] A fixing part that can prevent the valve core from falling and being lost may be provided on the outer side of the lower end of the sampling tube. The fixing part may include a fixing seat and a connecting rope. The fixing seat is fixedly installed on the outer side of the lower end of the valve core, and the connecting rope is fixedly installed on the fixing seat. The other end of the connecting rope is fixedly installed together with the lower end of the valve core.

[0008] The above may also include a sealing ring and a sealing gasket. At least one sealing ring is provided on the outside of the valve core corresponding to the positions above and below the liquid inlet. A limiting outer ring platform is provided on the outside of the lower end of the valve core. A sealing gasket that can be mounted on the outside of the valve core is provided on the upper side of the limiting outer ring platform.

[0009] The outer side wall of the sampling tube may be provided with a scale which can indicate the sampling depth.

[0010] The inner wall of the sampling tube may be provided with an oleophobic and hydrophobic coating.

[0011] The second technical solution of the present invention is achieved by the following measures: a sampling method is carried out as follows: in the first step, the upper part of the valve core is inserted into the inner side of the lower end of the sampling tube, and the liquid inlet is exposed outside the sampling tube; in the second step, the oil scraper is first pulled to the upper end of the sampling tube, and then the upper end of the sampling tube is held to keep it vertical to the liquid surface of the oil storage tank, and then the sampling tube is slowly inserted into the oil-water mixed liquid in the tank, so that the oil-water mixed liquid in the oil storage tank flows into the sampling tube through the liquid inlet and liquid outlet on the valve core; in the third step, when the lower end of the valve core touches the bottom of the tank, When removing the inner wall, keep it for a while to make the oil-water mixture in the sampling tube and the oil-water mixture in the oil storage tank remain relatively stable; the fourth step, hold the upper end of the sampling tube and press the sampling tube down hard, press the valve core into the sampling tube, so that the liquid inlet is blocked by the sampling tube, and close the sampling tube; the fifth step, pull out the sampling tube, and push the oil scraper downward at the same time to scrape off the oil stains adhering to the outer wall of the sampling tube; the sixth step, after the sampling tube is completely taken out, pour the water-oil mixture in the sampling tube into the sampling bottle, and the taken out oil-water mixture can be analyzed and tested.

[0012] The present invention has a reasonable and compact structure, is easy to use, and is simple and easy to operate. During the sampling process, since the atmospheric pressure outside the tank and outside the sampling tube is the same, the pressure of each liquid layer in the tank is proportional to its depth position. Therefore, according to the principle of communicating vessels, during the process of inserting the sampling tube into the oil in the tank, the oil in each liquid layer will be gradually pressed into the sampling tube. In other words, when the valve core touches the bottom of the tank, the sampling tube can record the oil in each liquid layer in the storage tank, realizing full-section sampling of the liquid in the tube, and the extracted sample has good consistency and continuity with the distribution of the liquid in the tank, which effectively improves the sampling accuracy and sampling speed. The operation is simple and easy to implement, which greatly reduces the labor intensity of the sampling operation, and has the characteristics of safety, labor saving, simplicity, and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a schematic diagram of the main view and partial cross-section structure of embodiments 1-7 of the present invention.

[0014] The codes in the attached drawings are: 1 is the valve core, 2 is the axial flow channel, 3 is the sampling tube, 4 is the liquid outlet, 5 is the liquid inlet, 6 is the oil scraper, 7 is the fixing seat, 8 is the connecting rope, 9 is the sealing ring, 10 is the sealing gasket, 11 is the limit outer ring platform, and 12 is the scale. DETAILED DESCRIPTION

[0015] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0017] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 As shown, the sampling device includes a valve core 1 and a sampling tube 3 with an axial flow channel 2. The inner side of the lower end of the sampling tube 3 is sleeved together with the outer side of the upper part of the valve core 1. The middle part of the upper side of the valve core 1 is provided with a liquid outlet 4 opening upward. The outer side of the middle part of the valve core 1 is evenly distributed along the circumference with at least two liquid inlets 5 whose inner ends can be connected to the liquid outlet 4.

[0018] During use, when the sampling tube 3 is slowly inserted vertically (i.e., perpendicular to the direction of the liquid surface in the tank) into the oil in the tank, each liquid layer in the tank can first flow into the valve core 1 through the liquid inlet 5, and then flow into the sampling tube 3 through the liquid outlet 4. When the valve core 1 touches the bottom of the tank, the liquid sampling of all liquid layers in the tank can be completed from top to bottom. At this time, the upper end of the sampling tube 3 can be pressed to press the valve core 1 into the sampling tube 3, thereby blocking the liquid sample in the tube. Finally, the sampling tube 3 can be lifted out of the tank to complete the sampling. According to the needs, in order to allow the liquid in the tube to quickly enter the sampling tube 3, the liquid inlet 5 in this embodiment is an oblong hole or a waist hole; three liquid inlets 5 are provided in this example.

[0019] Through such an arrangement, during the sampling process, since the atmospheric pressure outside the tank and outside the sampling tube 3 is the same, the pressure of each liquid layer in the tank is proportional to its depth position. Therefore, during the insertion of the sampling tube 3 into the oil in the tank, according to the principle of communicating vessels, the oil in each liquid layer will be gradually pressed into the sampling tube 3. In other words, when the valve core 1 touches the bottom of the tank, the sampling tube 3 can record the oil in each liquid layer in the storage tank, realizing full-section sampling of the liquid in the tube, and the extracted sample has good consistency and continuity with the distribution of the liquid in the tank, which effectively improves the sampling accuracy and sampling speed, is simple and easy to operate, and greatly reduces the labor intensity of the sampling operation.

[0020] The above sampling device can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 As shown, an oil scraper 6 is also included. The outer side of the sampling tube 3 is slidably installed with the oil scraper 6 which can remove the oil stains adhering to the outer wall of the sampling tube 3.

[0021] By setting it in this way, it can effectively avoid polluting the environment and wasting resources after taking excess oil out of the tank, and in the process of pouring out the liquid sample, it can also prevent the oil adhering to the outside of the sampling tube 3 from dripping into the sampling bottle, thereby preventing the contaminated sample from sliding into and affecting the sampling accuracy. According to the needs, the oil scraper 6 can be realized by a rubber tube or sleeve in the prior art. In this embodiment, the oil scraper 6 is in the shape of a bottle cap with an opening downward, and a round hole is provided in the middle of the top of the cap to allow the sampling tube 3 to pass through.

[0022] Embodiment 3: As attached Figure 1 As shown, a fixing portion is provided on the outer side of the lower end of the sampling tube 3 to prevent the valve core 1 from falling and being lost. The fixing portion includes a fixing seat 7 and a connecting rope 8. The fixing seat 7 is fixedly installed on the outer side of the lower end of the valve core 1, and the connecting rope 8 is fixedly installed on the fixing seat 7. The other end of the connecting rope 8 is fixedly installed together with the lower end of the valve core 1.

[0023] During use, when the valve core 1 is separated from the lower end of the sampling tube 3, the connecting rope 8 can still hold the valve core 1 to prevent the valve core 1 from falling into the storage tank. According to the needs, the fixing seat 7 can be realized by a hanging ring or a U-shaped clamp in the prior art, or a circular ring and a square mounting seat sleeved on the outside of the sampling tube 3. The fixing installation between the fixing seat 7 and the sampling tube 3 can be realized by clamping fixation or threaded fastener fixation or adhesive fixation or welding fixation or threaded connection or interference connection in the prior art. The connecting rope 8 can be a steel wire, nylon rope or chain in the prior art.

[0024] Embodiment 4: As attached Figure 1 As shown, it also includes a sealing ring 9 and a sealing gasket 10. At least one sealing ring 9 is provided on the outer side of the valve core 1 corresponding to the positions above and below the liquid inlet 5. A limiting outer ring platform 11 is provided on the outer side of the lower end of the valve core 1. A sealing gasket 10 that can be fitted on the outer side of the valve core 1 is provided on the upper side of the limiting outer ring platform 11.

[0025] Through such an arrangement, when the valve core 1 is completely pressed into the sampling tube 3, the sealing ring 9 and the sealing gasket 10 can seal the gap between the sampling tube 3 and the valve core 1, thereby preventing leakage of liquid sample in the sampling tube 3 during the process of extracting the sampling tube 3; the valve core 1 pressed into the sampling tube 3 is more easily removed by the limiting outer ring platform 11.

[0026] Embodiment 5: As attached Figure 1 As shown, a scale 12 capable of indicating the sampling depth is provided on the outer side wall of the sampling tube 3 .

[0027] By such arrangement, it is possible to quickly determine from outside the sampling tube 3 the depth position of the oil in the sampling tube 3 from which the oil is sampled in the storage tank, and determine the overall depth of the oil in the storage tank when sampling.

[0028] Embodiment 6: An oleophobic and hydrophobic coating is provided on the inner wall of the sampling tube 3 .

[0029] By such arrangement, when pouring out the sampled liquid, the oil in the sampling tube 3 can be poured out more cleanly, thus greatly reducing the residue and making the test result more accurate.

[0030] Embodiment 7: As attached Figure 1 As shown, the sampling method is performed as follows: in the first step, the upper part of the valve core 1 is inserted into the inner side of the lower end of the sampling tube 3, and the liquid inlet 5 is exposed outside the sampling tube; in the second step, the oil scraper 6 is first pulled to the upper end of the sampling tube 3, and then the upper end of the sampling tube 3 is held to keep it vertical to the liquid surface of the oil storage tank, and then the sampling tube 3 is slowly inserted into the oil-water mixed liquid in the tank, so that the oil-water mixed liquid in the oil storage tank flows into the sampling tube through the liquid inlet 5 and the liquid outlet 4 on the valve core 1; in the third step, when the lower end of the valve core 1 touches the inner wall of the tank bottom, it is kept for a period of time so that The liquid levels of the oil-water mixture in the sampling tube 3 and the oil-water mixture in the oil storage tank remain relatively stable; the fourth step is to hold the upper end of the sampling tube 3 and press the sampling tube 3 downward with force, and press the valve core 1 into the sampling tube 3 so that the liquid inlet 5 is blocked by the sampling tube 3, and the sampling tube 3 is closed; the fifth step is to pull up the sampling tube 3 and push the oil scraper 6 downward at the same time to scrape off the oil stains adhering to the outer wall of the sampling tube 3; the sixth step is to pour the water-oil mixture in the sampling tube 3 into the sampling bottle after the sampling tube 3 is completely taken out, and the taken out oil-water mixture can be analyzed and tested.

[0031] By using the above sampling method, oil samples from all liquid layers in the tank can be quickly collected at one time, and the sampled liquid is consistent with the composition order of the liquid layers in the tank, so full-section sampling of the oil in the tank can be achieved. The sampling is simple and easy to operate, and is safe, labor-saving, simple and efficient.

[0032] The above technical features constitute the embodiments of the present invention, 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 sampling device, characterized in that It includes a valve core and a sampling tube with an axial flow channel. The inner side of the lower end of the sampling tube is sheathed together with the outer side of the upper part of the valve core. The middle part of the upper side of the valve core is provided with a liquid outlet opening upward. The outer side of the middle part of the valve core is evenly distributed along the circumference with at least two liquid inlets whose inner ends can be connected to the liquid outlet.

2. The sampling device according to claim 1, characterized in that It also includes an oil scraper, which is slidably installed on the outer side of the sampling tube and can remove oil stains adhering to the outer wall of the sampling tube.

3. The sampling device according to claim 1 or 2, characterized in that A fixing part is provided on the outer side of the lower end of the sampling tube to prevent the valve core from falling and being lost. The fixing part includes a fixing seat and a connecting rope. The fixing seat is fixedly installed on the outer side of the lower end of the valve core, and the connecting rope is fixedly installed on the fixing seat. The other end of the connecting rope is fixedly installed together with the lower end of the valve core.

4. The sampling device according to claim 1 or 2, characterized in that It also includes a sealing ring and a sealing gasket. At least one sealing ring is provided on the outside of the valve core corresponding to the positions above and below the liquid inlet. A limiting outer ring platform is provided on the outside of the lower end of the valve core. A sealing gasket that can be fitted on the outside of the valve core is provided on the upper side of the limiting outer ring platform.

5. The sampling device according to claim 3, characterized in that It also includes a sealing ring and a sealing gasket. At least one sealing ring is provided on the outside of the valve core corresponding to the positions above and below the liquid inlet. A limiting outer ring platform is provided on the outside of the lower end of the valve core. A sealing gasket that can be fitted on the outside of the valve core is provided on the upper side of the limiting outer ring platform.

6. The sampling device according to claim 1, 2 or 5, characterized in that A scale capable of indicating the sampling depth is arranged on the outer wall of the sampling tube; or / and an oleophobic and hydrophobic coating is arranged on the inner wall of the sampling tube.

7. The sampling device according to claim 3, characterized in that A scale capable of indicating the sampling depth is arranged on the outer wall of the sampling tube; or / and an oleophobic and hydrophobic coating is arranged on the inner wall of the sampling tube.

8. The sampling device according to claim 4, characterized in that A scale capable of indicating the sampling depth is arranged on the outer wall of the sampling tube; or / and an oleophobic and hydrophobic coating is arranged on the inner wall of the sampling tube.

9. A sampling method using the sampling device according to any one of claims 3 to 8, characterized in that Proceed as follows: first, insert the upper part of the valve core into the inner side of the lower end of the sampling tube, and make the liquid inlet exposed outside the sampling tube; second, pull the oil scraper to the upper end of the sampling tube, hold the upper end of the sampling tube to keep it vertical to the liquid surface of the oil storage tank, and then slowly insert the sampling tube into the oil-water mixture in the tank, so that the oil-water mixture in the oil storage tank flows into the sampling tube through the liquid inlet and liquid outlet on the valve core; third, when the lower end of the valve core touches the inner wall of the tank bottom, keep it for a while to make the sampling tube The liquid levels of the oil-water mixture inside and the oil storage tank remain relatively stable; the fourth step is to hold the upper end of the sampling tube and press the sampling tube down hard, press the valve core into the sampling tube, so that the liquid inlet is blocked by the sampling tube, and close the sampling tube; the fifth step is to pull up the sampling tube and push the oil scraper downward at the same time to scrape off the oil stains adhering to the outer wall of the sampling tube; the sixth step is to pour the water-oil mixture in the sampling tube into the sampling bottle after the sampling tube is completely taken out, and the taken out oil-water mixture can be analyzed and tested.

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