Sampler and sampling method for petroleum or petroleum hydrocarbon in underground water monitoring well

Abstract

The invention discloses a sampler and a sampling method for petroleum or petroleum hydrocarbon in an underground water monitoring well, and relates to the technical field of environment-friendly water quality detection in petroleum and petrochemical industries, the sampler comprises a first threaded cover, a main bottle body, a floating ball baffle, a floating ball and a second threaded cover; wherein; a hole is formed in the top of the main bottle body, a threaded structure is arranged on the outer surface of the hole, the main bottle body is in threaded connection with the first threaded cover through the hole, and an air hole structure is arranged on the first threaded cover; an inlet channel is formed in the bottom of the main bottle body, a threaded structure is arranged on the outer surface of the inlet channel, and the main bottle body is in threaded connection with the second threaded cover through the inlet channel; the floating ball baffle and the floating ball are arranged in the main bottle body, and the floating ball is positioned at the lower part of the floating ball baffle. According to the invention, the problems of incapability of ensuring collection of surface water and secondary transfer in petroleum or petroleum hydrocarbon sampling in an underground water monitoring well at present are effectively solved, and the collected water sample truly reflects the content of petroleum or petroleum hydrocarbon in underground water.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection water quality detection in the petroleum and petrochemical industries, and in particular to a sampler and a sampling method for petroleum or petroleum hydrocarbons in a groundwater monitoring well. Background Art

[0002] Petroleum or petroleum hydrocarbons are an important type of potential pollutants in groundwater in enterprises in industries such as oil and natural gas extraction and oil processing. They are one of the pollutants that must be measured in groundwater during soil pollution surveys or special groundwater surveys. The accuracy of the analysis results of petroleum or petroleum hydrocarbon content in groundwater is particularly important for judging the soil or groundwater pollution situation.

[0003] At present, groundwater samples are collected from groundwater monitoring wells, and the sampling facilities and equipment used are usually bele tubes or airbag pumps. The bele tube is mainly composed of a float and a sampling container. The sampling principle is to put the float and the sampling container into the well pipe of the groundwater monitoring well. The float rises due to buoyancy, opens the bottom channel of the sampling container, and the water sample enters the sampling container. After the bele tube sinks and collects a certain amount of water samples, it is slowly lifted up. The float sinks due to water pressure and blocks the bottom channel of the sampling container, and the water sample is sealed in the sampling container. After the bele tube is raised to the surface of the water, the water sample will be transferred to the laboratory sampling bottle and then transported to the laboratory for analysis and testing. The airbag pump sampling mainly involves placing the water inlet pipe into the well pipe of the groundwater monitoring well, pumping through the airbag pump placed on the ground, and the sampling bottle collects water samples at the ground outlet pipe and then transports them to the laboratory. In order to ensure that there is always water to be sucked into the airbag pump during the sampling process, the water intake pipe of the airbag pump is usually inserted to a certain depth above the water surface. This sampling method cannot collect surface water.

[0004] The detection indicators of petroleum hydrocarbons are generally petroleum hydrocarbons C6-C9, petroleum hydrocarbons C 10 -C 40 The specific gravity of petroleum or petroleum hydrocarbons is less than that of water, and they are usually unevenly distributed at the top of the water layer. The selective removal of oil-bearing surface water is inevitable during the secondary transfer of the Belle tube. The airbag pump cannot guarantee that surface water can be collected during sampling. Both cannot intercept static columnar water samples, and the water samples lose their representativeness, making it difficult to truly reflect the content of petroleum or petroleum hydrocarbons in groundwater. Summary of the invention

[0005] The purpose of the present invention is to provide a sampler and sampling method for petroleum or petroleum hydrocarbons in groundwater monitoring wells, which effectively solves the problem that the current sampling of petroleum or petroleum hydrocarbons in groundwater monitoring wells cannot guarantee the collection of surface water and there is secondary transfer; at the same time, the collected water samples are representative and truly reflect the content of petroleum or petroleum hydrocarbons in groundwater.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a sampler for petroleum or petroleum hydrocarbons in groundwater monitoring wells, the sampler comprising: a first threaded cover, a main body, a float barrier, a float and a second threaded cover; wherein;

[0008] The main body of the bottle is provided with a hole on the top, the outer surface of the hole is provided with a threaded structure, the main body of the bottle is threadedly connected with the first threaded cover through the hole, and the first threaded cover is provided with an air hole structure;

[0009] The bottom of the main body is provided with an inlet channel, the outer surface of the inlet channel is provided with a threaded structure, and the main body is threadedly connected with the second threaded cover through the inlet channel;

[0010] The float block and the float are both arranged inside the main bottle body, and the float is located at the lower part of the float block.

[0011] Furthermore, the sampler further comprises: a stretch rope and a stretch rope ring; wherein,

[0012] The stretch rope ring is symmetrically arranged on the top of the main bottle body;

[0013] The stretch cord passes through the stretch cord loop.

[0014] Furthermore, the pores are made of a special material membrane that is air-permeable and water-impermeable.

[0015] Furthermore, the first threaded cover, the stretch rope ring, the main bottle body, the float barrier, the float and the second threaded cover are all made of polyethylene.

[0016] Furthermore, the floating ball baffle is a symmetrically structured multi-pointed star or polygon, and the cross-sectional diameter thereof is the same as the diameter of the main bottle body.

[0017] Furthermore, the diameter of the float is smaller than the diameter of the float baffle.

[0018] Furthermore, the diameter of the float is larger than the diameter of the inlet channel and smaller than the distance from the center of the float baffle to the bottom of the main bottle body.

[0019] The present invention also provides a method for sampling petroleum or petroleum hydrocarbons in a groundwater monitoring well, the method comprising the following steps:

[0020] Step S1, sealing the top of the sampler body with a first threaded cap, and slowly lowering the sampler into the well pipe of the groundwater monitoring well by stretching the rope;

[0021] Step S2, when the float ball at the bottom of the sampler contacts the groundwater and floats up, the water inlet channel of the sampler is opened, and the sampler is slowly lowered;

[0022] Step S3, when the sampler is completely submerged in water and the sampling container is completely filled with water sample, the sampler is slowly lifted upward;

[0023] Step S4: After the sampler is lifted to the ground, the water inlet channel at the bottom of the sampler is sealed with a second threaded cover without air holes.

[0024] Technical effects and advantages of the present invention:

[0025] (1) The sampler of the present invention collects static columnar water samples including surface water, and there is no problem of selectively removing the oil-containing surface water, so that the collected water samples are representative and can truly reflect the content of petroleum or petroleum hydrocarbons in groundwater.

[0026] (2) The top and bottom of the sampler of the present invention can be sealed, and the collected water samples can be directly stored and circulated to the laboratory without the problem of secondary transfer of water samples.

[0027] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of a sampler for petroleum or petroleum hydrocarbons in a groundwater monitoring well of the present invention;

[0029] Figure 2 A top view of the bottom structure of a sampler for petroleum or petroleum hydrocarbons in a groundwater monitoring well according to the present invention;

[0030] Figure 3 A flow chart of a method for sampling petroleum or petroleum hydrocarbons in a groundwater monitoring well according to the present invention;

[0031] In the figure, 1. stretching rope; 2. first threaded cap; 3. stretching rope ring; 4. main bottle body; 5. float block; 6. float; 7. second threaded cap. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to solve the deficiencies of the prior art, the present invention discloses a sampler for petroleum or petroleum hydrocarbons in groundwater monitoring wells. Figure 1 The schematic diagram of the structure of a sampler for petroleum or petroleum hydrocarbons in a groundwater monitoring well of the present invention is as follows: Figure 1 As shown, the sampler comprises: a stretch rope 1, a first threaded cover 2, a stretch rope ring 3, a main bottle body 4, a float barrier 5, a float 6 and a second threaded cover 7; wherein;

[0034] The top of the main bottle body 4 is symmetrically provided with stretch rope rings 3, and the number of the stretch rope rings 3 can be 2, 4 or 6, preferably 2; the number of the stretch ropes 1 matches the number of the stretch rope rings 3, which can be 1, 2 or 3, preferably 1, and the two ends of the stretch rope 1 pass through the two stretch rope rings 3 in sequence; wherein, the stretch rope rings 3 are made of a material with excellent low temperature resistance, good chemical stability, and resistance to most acid and alkali corrosion, preferably polyethylene.

[0035] A hole matching the size of the first threaded cap 2 is provided on the top of the main bottle body 4, and a threaded structure is provided on the outer surface of the hole, so that the main bottle body 4 can be threadedly connected with the first threaded cap 2; wherein, the first threaded cap 2 is provided with an air hole structure, and the air hole is a special material membrane that is breathable and impermeable to water, that is, a waterproof and breathable membrane; similarly, the first threaded cap 2 and the main bottle body 4 are preferably made of polyethylene.

[0036] A water inlet channel matching the size of the second threaded cover 7 is provided at the bottom of the main bottle body 4, and a threaded structure is provided on the outer surface of the water inlet channel, which can threadably connect the main bottle body 4 and the second threaded cover 7; the water inlet channel can be used as a collection entrance for groundwater samples; similarly, the second threaded cover 7 is preferably made of polyethylene.

[0037] The float barrier 5 and the float 6 are both disposed inside the main body 4, and the float barrier 5 is welded to the main body 4; the float 6 is located at the lower part of the float barrier 5, and the float 6 can move freely up and down inside the main body 4. Similarly, the float barrier 5 and the float 6 are preferably made of polyethylene.

[0038] Further, Figure 2 The bottom structure of a sampler for petroleum or petroleum hydrocarbons in a groundwater monitoring well of the present invention is shown in FIG. Figure 2As shown, the float barrier 5 is a symmetrically structured multi-pointed star or polygon, preferably a four-pointed star, a six-pointed star or an eight-pointed star; and its cross-sectional diameter is the same as the diameter of the main body 4, the diameter of the float 6 is smaller than the diameter of the float barrier 5, and the diameter of the float 6 is larger than the diameter of the inlet channel and smaller than the distance from the center of the float barrier 5 to the bottom of the main body 4. When the sampler sinks, the float 6 floats up to open the water inlet channel at the bottom of the sampler; when the sampler rises, the float 6 sinks to block the water inlet channel at the bottom of the sampler, which is the initial "automatic" sealing of the bottom of the sampler.

[0039] Furthermore, since the outer surface of the water inlet channel at the bottom of the sampler is threaded, it can be connected to the second threaded cover 7 (without "air holes") at the bottom. When the sampler is lifted to the ground, the second threaded cover 7 (without "air holes") at the bottom is tightened outside the water inlet channel at the bottom of the sampler, which is the secondary seal of the bottom of the sampling container.

[0040] It should be noted that the sampler of the present invention has an outer diameter of 45 mm and can enter a groundwater monitoring well with an inner diameter of the well pipe of not less than 50 mm to collect water samples. The sampler of the present invention can also be customized with different outer diameters according to the inner diameter of the well pipe.

[0041] The present invention also discloses a sampler for petroleum or petroleum hydrocarbons in a groundwater monitoring well. Figure 3 The flow chart of the sampling method of petroleum or petroleum hydrocarbons in a groundwater monitoring well of the present invention is as follows: Figure 3 As shown, the method comprises the following steps:

[0042] Step S1, when sampling petroleum or petroleum hydrocarbons in groundwater monitoring wells, first seal the top of the sampler main body 4 with a first threaded cover 2 containing air holes, and after the stretching rope ring 3 is hung on the stretching rope 1, slowly lower the sampler into the well pipe of the groundwater monitoring well.

[0043] Step S2, when the float ball 6 at the bottom of the sampler contacts the groundwater and floats up, the water inlet channel of the sampler is opened. Because the float ball baffle 5 is provided at the bottom of the sampler, the floating height of the float ball 6 at the bottom of the sampler is limited, and only the water inlet channel is opened, so that groundwater can enter the sampler. As the sampler continues to slowly lower, all the original air in the sampler moves upward and is discharged from the pores through the first threaded cover 2 with pores at the top, and groundwater enters from the bottom of the sampler and fills the sampler.

[0044] Step S3, when the sampler is completely submerged in water, ensure that the first threaded cover 2 with air holes on the top of the sampler is also below the water surface, and keep it still for 1 to 2 minutes. After the sampling container is completely filled with water samples, start to slowly lift the sampler upward. The float ball 6 at the bottom of the sampler is no longer supported by buoyancy and no longer remains in a floating state during the process of slowly lifting the sampler upward. Instead, it sinks to the bottom of the sampler under the water pressure of the groundwater in the sampler, blocking the water inlet channel at the bottom of the sampler, achieving the "automatic" preliminary sealing of the bottom of the sampler, and the water sample in the sampler cannot overflow the sampler through the air holes, so as to achieve the purpose of preventing the loss and leakage of water samples.

[0045] Step S4, after the sampler is lifted to the ground, the water inlet channel at the bottom of the sampler is re-sealed with a second threaded cover 7 without pores. At this point, a sampler for petroleum or petroleum hydrocarbons in groundwater monitoring wells has completed the collection of petroleum or petroleum hydrocarbon water samples in groundwater monitoring wells, so as to achieve sample preservation and circulation.

[0046] In summary, the use of the sampler of the present invention can ensure that each water sample is collected together with the surface water, and the water samples collected on site can be directly transferred to the laboratory through the sampler without the need to repackage the samples throughout the process.

[0047] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sampler for petroleum or petroleum hydrocarbons in groundwater monitoring wells, characterized in that: The sampler comprises: a first threaded cover (2), a main bottle body (4), a floating ball barrier (5), a floating ball (6) and a second threaded cover (7); wherein; The main body (4) has a hole at the top, and a threaded structure is provided on the outer surface of the hole. The main body (4) is threadedly connected to the first threaded cover (2) through the hole, and the first threaded cover (2) is provided with an air hole structure. An inlet channel is provided at the bottom of the main bottle body (4), a threaded structure is provided on the outer surface of the inlet channel, and the main bottle body (4) is threadedly connected to the second threaded cover (7) through the inlet channel; The float baffle (5) and the float ball (6) are both arranged inside the main bottle body (4), and the float ball (6) is located at the lower part of the float baffle (5).

2. A sampler for petroleum or petroleum hydrocarbons in groundwater monitoring wells according to claim 1, characterized in that: The sampler further comprises: a stretch rope (1) and a stretch rope ring (3); wherein: The stretch rope ring (3) is symmetrically arranged on the top of the main bottle body (4); The stretch cord (1) passes through the stretch cord ring (3).

3. A sampler for petroleum or petroleum hydrocarbons in groundwater monitoring wells according to claim 2, characterized in that: The pores are made of a special material membrane that is air-permeable and water-impermeable.

4. A sampler for petroleum or petroleum hydrocarbons in groundwater monitoring wells according to claim 2 or 3, characterized in that: The first threaded cover (2), the stretch rope ring (3), the main bottle body (4), the float barrier (5), the float (6) and the second threaded cover (7) are all made of polyethylene.

5. A sampler for petroleum or petroleum hydrocarbons in groundwater monitoring wells according to claim 1, characterized in that: The floating ball baffle (5) is a symmetrically structured multi-pointed star or polygon, and its cross-sectional diameter is the same as the diameter of the main bottle body (4).

6. A sampler for petroleum or petroleum hydrocarbons in groundwater monitoring wells according to claim 1, characterized in that: The diameter of the float (6) is smaller than the diameter of the float baffle (5).

7. A sampler for petroleum or petroleum hydrocarbons in groundwater monitoring wells according to claim 6, characterized in that: The diameter of the float (6) is greater than the diameter of the inlet channel and smaller than the distance from the center of the float baffle (5) to the bottom of the main bottle body (4).

8. A method for sampling petroleum or petroleum hydrocarbons in groundwater monitoring wells, the method using the sampler according to claims 1-7, characterized in that: The method comprises the following steps: Step S1, sealing the top of the sampler main body bottle (4) with a first threaded cover (2), and slowly lowering the sampler into the well pipe of the groundwater monitoring well by stretching the rope (1); Step S2, when the float ball (6) at the bottom of the sampler contacts the groundwater and floats up, the water inlet channel of the sampler is opened, and the sampler is slowly lowered; Step S3, when the sampler is completely submerged in water and the sampling container is completely filled with water sample, the sampler is slowly lifted upward; Step S4: After the sampler is lifted to the ground, the water inlet channel at the bottom of the sampler is sealed with a second threaded cover (7) without air holes.

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