A gas sampling device for oil and gas wells

Abstract

The present invention relates to the technical field related to gas well exploitation, and discloses a gas sampling device for oil and gas wells, including a gas collecting body, a gas output cavity is arranged in the gas collecting body, the gas output cavity is provided with inclined cavity walls above and below, a vertical mesh is installed in the gas output cavity, a cotton sheet is installed in the gas output cavity, and the gas output cavity is connected with a sampling output pipe; the gas sampling device for oil and gas wells of the present invention is provided with a high-precision gas collection function, an expanded bottom cavity and a vertical cavity, so that the liquid in the oil and gas mixture drawn into the collection and processing body is easily accumulated in a large amount in the expanded bottom cavity and discharged by the drain valve pipe, and at the same time, by adjusting the power of the return air pump, the liquid level height of the oil-liquid mixture is placed slightly higher than the installation tube position, and the expanded bottom cavity is provided at the bottom of the vertical cavity, so that the liquid can be accumulated in the expanded bottom cavity after the oil-liquid mixture is drawn in, so that the upward impact effect on the liquid is alleviated.

Description

Technical Field

[0001] The invention relates to the technical field related to gas well exploitation, and in particular to a gas sampling device for oil and gas wells. Background Art

[0002] Oil and gas well exploitation is an important link in the collection of some important industrial resources. The exploitation, maintenance and inspection of oil and gas wells are very important. Therefore, it is necessary to sample the gas in the oil and gas wells regularly. The humidity of the gas in the sample collected during the gas sampling process and the oil-liquid separation effect determine the accuracy of the gas sampling. However, during the sampling process of conventional gas sampling equipment, the efficiency of liquid and gas separation in the collection and withdrawal process is slow, resulting in a decrease in sampling accuracy and efficiency. At the same time, it causes liquid splashing and atomized liquid and airflow to be extracted together, resulting in the inability to guarantee the sample qualification rate and accuracy.

[0003] CN209855769U discloses an oil and gas separation device for an oil and gas well, including a primary separation cylinder, an oil and gas separation baffle and a mixed liquid inlet are arranged in the primary separation cylinder, the oil and gas separation baffle is fixed in the primary separation cylinder and is located above the mixed liquid inlet; it also includes a secondary separation cylinder and a gas guide pipe, a demister is arranged in the secondary separation cylinder, the demister is installed in the secondary separation cylinder, and a gas sampling hole is arranged above the demister on the secondary separation cylinder; one end of the gas guide pipe is arranged above the oil and gas separation baffle in the primary separation cylinder, and the other end is arranged below the demister in the secondary separation cylinder. The technical solution provided by the utility model is that the gas volatilized from the mixed liquid is not only separated by the oil and gas separation baffle in the primary separation cylinder, but also separated by the demister in the secondary separation cylinder, so the purity of the sampled gas can be improved.

[0004] CN202451149U discloses a gas sampling device for oil and gas wells, belonging to the technical field of sampling devices for wellhead production processes of conventional oil and gas production wells, and is composed of an oil and gas separation pipe shell, a flange blind plate, a sampling short pipe, a sampling valve, a sewage short pipe, and a sewage valve. The upper part of the oil and gas separation pipe shell is a connecting flange, and the oil and gas inlet pipe is welded on the middle pipe wall; the flange blind plate is installed on the connecting flange on the upper part of the oil and gas separation pipe shell by bolts, a sampling short pipe is welded in the center hole of the flange blind plate, a sampling valve is installed on the sampling short pipe, a connecting bracket is welded on the lower end surface of the flange blind plate, and a baffle is welded on the connecting bracket. Through the blocking of the baffle, the gas entering the oil and gas separation pipe shell can be completely separated from the oil-water mixture, ensuring the qualified rate of gas sampling and improving the quality of gas sample collection. It has a simple structure, is easy to carry and install, solves the problem of sampling cock gas sampling in the wellhead riser sampling of conventional oil and gas production wells, and can effectively ensure the safety of operators.

[0005] CN202731910U discloses a multifunctional oil and gas well casing gas-liquid separation and filtering and drying device, which is designed for gas-liquid separation, filtering and drying of casing gas before sampling and testing. The device consists of four parts: primary separation and gas diversion, secondary gas-liquid separation and liquid reflux, tertiary gas-liquid separation and drying and filtering, which are connected in sequence. It includes a double-ended short-circuit connecting the total high-pressure gate and the capillary, a secondary separator provided with an airflow channel, a liquid reflux channel and inner and outer blocking covers, a tertiary separator provided with a separation chamber and an inner conical blocking plate, a drying and filtering chamber connected to a gas observation pipeline and a gas collection and testing pipeline, etc. The utility model can implement pressure relief, gas-liquid separation and filtering and drying treatment on pipeline gas on site, conduct scientific and accurate sampling and testing, avoid pollution to the human body and the pumping unit, greatly reduce the diffusion concentration of casing gas in the air, greatly shorten the test time, and the test result is highly accurate.

[0006] During the sampling process, the gas sampling equipment of the above patent is prone to slow separation efficiency of liquid and gas in the collection and withdrawal process, resulting in reduced sampling accuracy and efficiency. At the same time, it causes liquid splashing and atomized liquid and airflow to be drawn away together, resulting in the inability to guarantee sample qualification rate and accuracy. Summary of the invention

[0007] The object of the present invention is to provide a gas sampling device for oil and gas wells, so as to overcome the above-mentioned defects in the prior art.

[0008] The present invention is achieved through the following technical solutions.

[0009] The present invention discloses a gas sampling device for oil and gas wells, comprising a gas collecting body, a gas output chamber is arranged in the gas collecting body, the gas output chamber is provided with inclined chamber walls at the top and the bottom, a vertical mesh is installed in the gas output chamber, a cotton sheet is installed in the gas output chamber, the gas output chamber is connected with a sampling output pipe, the lower side of the gas output chamber is connected with a liquid displacement valve pipe, a back-suction air pump is installed in the gas collecting body, a collection processing unit is installed at the bottom of the gas collecting body, the collection processing unit comprises a collection processing body, a vertical chamber is arranged in the collection processing body, the top of the vertical chamber is connected with the back-suction air pump, a gas filter unit is installed in the vertical chamber, the gas filter unit comprises a filter slot plate, and the gas filter unit comprises a filter slot plate. The filter slot plate array is installed with spacers, and gas transmission grooves are provided between adjacent spacers, and the gas transmission grooves are arranged on the inner wall of the filter slot plate. The spacer plate array is installed with functional baffles, and an expanded bottom cavity is provided at the bottom of the vertical cavity, and a drain valve pipe is installed in the expanded bottom cavity. A liquid filtration module is installed at the bottom of the vertical cavity, and the liquid filtration module is connected to a withdrawal valve pipe. A mounting ring is installed on the upper inner wall of the expanded bottom cavity, and a stirring blade is rotatably installed in the mounting ring. A mounting cylinder is installed on the lower inner wall of the vertical cavity, and a conical mesh cylinder is rotatably installed in the mounting cylinder. The inner wall array of the conical mesh cylinder is installed with inclined guide strips, and the inclined guide strips are regularly arranged with a certain inclination angle.

[0010] According to a further technical solution, the functional baffle is installed with an upward tilt angle.

[0011] According to a further technical solution, a heating module is installed on the inner wall of the top of the gas collection body, and a heat conductive block is installed on the heating module. The heat conductive block is in contact with the vertical mesh and the cotton sheet, and a heat conductive wire is connected to the heating module.

[0012] According to a further technical solution, a heat conducting plate is installed in the filter slot plate, the heat conducting plate is connected to the heat conducting wire, a heating wire is connected in the functional baffle, the heating wire is connected to the heat conducting plate, and a concave reflux groove is provided in the bottom array of the functional baffle.

[0013] According to a further technical solution, two mounting blocks are symmetrically mounted on the inner wall of the vertical cavity, a liquid baffle plate is rotatably mounted on the mounting block, a return spring is connected to the liquid baffle plate, and the two mounting blocks have a certain height difference.

[0014] According to a further technical solution, cotton pieces are symmetrically installed on the horizontal mesh.

[0015] According to a further technical solution, the mounting ring is provided with a transmission motor, the transmission motor is motively connected to the stirring blade, a transmission shaft is provided on the upper side of the stirring blade, a transmission rod is provided at the bottom of the conical mesh cylinder, and a transmission belt is connected between the transmission rod and the transmission shaft.

[0016] According to a further technical solution, the gas collecting body is installed with a fixing frame.

[0017] Beneficial effects of the present invention:

[0018] The gas sampling device for oil and gas wells of the present invention is provided with a high-precision gas collection function, and the expanded bottom cavity and the vertical cavity are provided, so that the liquid in the oil-gas mixture drawn into the collection and processing body is easily accumulated in large quantities in the expanded bottom cavity and discharged from the discharge valve pipe. At the same time, by adjusting the power of the return air pump, the liquid level of the oil-liquid mixture is placed slightly higher than the position of the installation tube. The expanded bottom cavity is provided at the bottom of the vertical cavity, so that the liquid can be accumulated in the expanded bottom cavity after the oil-liquid mixture is drawn in, so that the upward impact effect on the liquid is relieved, thereby reducing the problem of droplets and mist splashing affecting the sampling effect, and at the same time, the effect of extending the effective separation time of liquid and gas is achieved;

[0019] The gas sampling device for oil and gas wells of the present invention is provided with a high-precision gas collection function, and is provided with a stirring blade in the expanded bottom cavity and a conical mesh cylinder component at the lower side of the vertical cavity. The stirring blade is driven to rotate by a control component, so that a rolling effect is formed on the liquid stored in the expanded bottom cavity, so that the liquid discharge rate is adjusted to avoid the problem of slow discharge of viscous oil liquid, and at the same time, the gas in the mixture is more likely to evaporate upward during the stirring process. In combination with the rotation effect of the conical mesh cylinder and the inclined guide strips arranged at regular inclinations, the mesh structure of the conical mesh cylinder and its shape effect can realize driving the upper liquid to form a stable vortex, thereby reducing the problem of gas-liquid splashing. At the same time, during the mesh rotation process, the floating bubbles can be dispersed and discharged internally, thereby further avoiding the problem of gas-liquid separation and splashing.

[0020] The gas sampling device for oil and gas wells of the present invention is provided with a high-precision gas collection function. During the upward extraction of gas, the gas passes through the gas filter part and the functional baffles arranged by the spacer array, which can achieve the gas diversion effect and the shielding of splashing droplets. At the same time, in combination with the morphological characteristics of the functional baffles and the internal heating component, the mist droplets in the gas can be heated and liquefied during the gas diversion upward along the functional baffles, adsorbed in the functional baffles and flowed back downward along the functional baffles, thereby improving the purity of gas sampling and improving the accuracy of the sample. Finally, the sampled gas enters the gas output cavity. The setting of the inclined cavity wall can make it easier for the gas to flow along the upper inclined cavity wall and output the processed sampled gas through the sampling output pipe. At the same time, the vertical mesh and the horizontal mesh are connected to the heating component to achieve the best one-time removal of mist and droplet processing for the sampled gas entering the gas output cavity, and the inclined cavity wall at the bottom can facilitate the interception of droplets along the inclined cavity wall and finally discharge them through the liquid displacement valve pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 yes Figure 1 An enlarged schematic diagram of the structure of the acquisition and processing unit 15;

[0025] Figure 3 yes Figure 2 An enlarged schematic diagram of the top view of the gas filter 30;

[0026] Figure 4 yes Figure 2 An enlarged schematic diagram of the side structure of the middle gas filter 30;

[0027] Figure 5 yes Figure 2 A is a schematic diagram of the enlarged structure of the middle part;

[0028] Figure 6 yes Figure 4 Schematic diagram of the enlarged structure of B. DETAILED DESCRIPTION

[0029] Combine the following Figure 1-6 The present invention is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front, and back directions mentioned below are the same as Figure 1 The up-down, left-right, front-back directions of the projection relationship itself are consistent.

[0030] Combined with Figure 1-6The oil and gas well gas sampling device comprises a gas collecting body 11, a gas output chamber 16 is arranged in the gas collecting body 11, the gas output chamber 16 is provided with inclined chamber walls 20 above and below, a vertical mesh sheet 21 is installed in the gas output chamber 16, a cotton sheet 23 is installed in the gas output chamber 16, a sampling output pipe 24 is connected to the gas output chamber 16, a liquid displacement valve pipe 25 is connected to the lower side of the gas output chamber 16, a back-suction air pump 13 is installed in the gas collecting body 11, a collecting and processing unit 15 is installed at the bottom of the gas collecting body 11, the collecting and processing unit 15 comprises a collecting and processing body 26, a vertical chamber 27 is arranged in the collecting and processing body 26, the top of the vertical chamber 27 is connected to the back-suction air pump 13, a gas filter unit 30 is installed in the vertical chamber 27, and the gas filter unit 30 comprises a filter slot plate 33. The filter slot plate 33 is installed with spacers 34 in array, and gas transmission grooves 35 are provided between adjacent spacers 34. The gas transmission grooves 35 are arranged on the inner wall of the filter slot plate 33. Functional baffles 36 are installed in the array of spacers 34. An expanded bottom cavity 28 is provided at the bottom of the vertical cavity 27. A discharge valve pipe 29 is installed in the expanded bottom cavity 28. A liquid filtration module 31 is installed at the bottom of the vertical cavity 27. The liquid filtration module 31 is connected to the withdrawal valve pipe 32. A mounting ring 47 is installed on the upper inner wall of the expanded bottom cavity 28. A stirring blade 48 is rotatably installed in the mounting ring 47. A mounting cylinder 42 is installed on the lower inner wall of the vertical cavity 27. A conical mesh cylinder 43 is rotatably installed in the mounting cylinder 42. Inclined guide strips 44 are installed in an array on the inner wall of the conical mesh cylinder 43. The inclined guide strips 44 are regularly arranged with a certain inclination angle.

[0031] During operation, the return air pump 13 is started, and the oil-gas mixture is drawn upward through the return valve tube 32. Through the arrangement of the enlarged bottom cavity 28 and the vertical cavity 27, the liquid in the oil-gas mixture drawn into the collection and processing body 26 is easily accumulated in large quantities by the enlarged bottom cavity 28 and discharged by the discharge valve tube 29. At the same time, by adjusting the power of the return air pump 13, the liquid level of the oil-liquid mixture is placed slightly higher than the position of the mounting tube 42. The enlarged bottom cavity 28 is arranged at the bottom of the vertical cavity 27, so that the oil-liquid mixture can be accumulated by the enlarged bottom cavity 28 after being drawn in, so that the upward impact effect of the liquid is relieved, thereby reducing droplets and The problem of mist splashing affecting the sampling effect is solved, and at the same time, the effect of extending the effective separation time of liquid and gas is achieved. The stirring blade 48 in the expanded bottom cavity 28 and the conical mesh cylinder 43 on the lower side of the vertical cavity 27 are set, and the stirring blade 48 is driven to rotate through the control component, so that the accumulated liquid in the expanded bottom cavity 28 is formed with a rolling effect, so as to adjust the liquid discharge rate to avoid the problem of slow discharge of viscous oil, and at the same time, the gas in the mixture is more likely to evaporate upward during the stirring process. In combination with the rotation effect of the conical mesh cylinder 43 and the inclined guide strips 44 arranged at a regular angle, the conical mesh cylinder 43 The mesh structure, combined with its shape effect, can drive the upper liquid to form a stable vortex, thereby reducing the problem of gas-liquid splashing. At the same time, during the mesh rotation process, the floating bubbles can be dispersed and discharged internally to further avoid the problem of gas-liquid separation and splashing. During the upward extraction of gas, it passes through the gas filter 30 and the functional baffle 36 arranged by the array of spacers 34 to achieve the gas diversion effect and the shielding of splashing droplets. At the same time, combined with the morphological characteristics of the functional baffle 36 and the internal heating component, the mist droplets in the gas can be heated and liquefied and adsorbed on the functional baffle 36 during the gas diversion process upward. The gas flows back downwards into the baffle 36 and along the functional baffle 36, thereby improving the purity of the gas sampling and improving the accuracy of the sample. Finally, the sampled gas enters the gas output chamber 16. The setting of the inclined chamber wall 20 can make it easier for the gas to flow along the upper inclined chamber wall 20 to output the processed sampled gas through the sampling output pipe 24. At the same time, the vertical mesh 21 and the horizontal mesh 22 are connected to the heating component to achieve the best one-time removal of mist and droplets for the sampled gas entering the gas output chamber 16, and the inclined chamber wall 20 at the bottom can facilitate the interception of droplets along the inclined chamber wall 20 and finally discharge them through the liquid discharge valve tube 25.

[0032] Preferably, the functional baffle 36 is installed with a certain upward angle.

[0033] The upward tilt of the functional baffle 36 realizes an upward flow guiding effect on the gas and a downward flow reflux effect on the intercepted liquid droplets.

[0034] Preferably, a heating module 17 is installed on the inner wall of the top of the gas collector 11 , and a heat-conducting block 19 is installed on the heating module 17 . The heat-conducting block 19 is in contact with the vertical mesh 21 and the cotton sheet 23 , and the heating module 17 is connected to a heat-conducting wire 18 .

[0035] The temperature is raised by the heating module 17 so as to cooperate with the filter assembly to achieve better demisting and anti-droplet effects.

[0036] Preferably, a heat conducting sheet 38 is installed in the filter slot plate 33, and the heat conducting sheet 38 is connected to the heat conducting wire 18. A heating wire 51 is connected in the functional baffle 36, and the heating wire 51 is connected to the heat conducting sheet 38. The bottom array of the functional baffle 36 is provided with a concave reflux groove 52.

[0037] The heating wire 51 is used to heat the functional baffle 36 , and the concave reflux groove 52 and the tilt angle are used to heat the gas flowing through the baffle 36 so as to guide the mist droplets downward.

[0038] Preferably, two mounting blocks 39 are symmetrically mounted on the inner wall of the vertical cavity 27 , and a liquid baffle plate 40 is rotatably mounted on the mounting block 39 . The liquid baffle plate 40 is connected to a return spring 41 , and the two mounting blocks 39 have a certain height difference.

[0039] The two liquid baffles 40 are arranged above the mounting tube 42 , thereby preventing large liquid droplets from splashing upwards during the process of pumping the oil-gas mixture.

[0040] Preferably, the transverse mesh 22 is symmetrically mounted with cotton pieces 23 .

[0041] The problem of mist and droplets in the gas passing through can be avoided by the cotton sheet 23 and the horizontal mesh sheet 22 for heating effect.

[0042] Preferably, the mounting ring 47 is equipped with a transmission motor 49, which is powered by a stirring blade 48, a transmission shaft 53 is installed on the upper side of the stirring blade 48, a transmission rod 45 is installed at the bottom of the conical net cylinder 43, and a transmission belt 46 is connected between the transmission rod 45 and the transmission shaft 53.

[0043] The driving motor 49 is started to drive the stirring blades 48 and the conical mesh cylinder 43 to rotate.

[0044] Preferably, the gas collecting body 11 is installed with a fixing frame 14 .

[0045] The fixing frame 14 is used to facilitate installation and fixing.

[0046] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology in this field to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas sampling device for oil and gas wells, comprising a gas collection body, characterized in that: A gas output chamber is provided in the gas collection body, inclined chamber walls are provided above and below the gas output chamber, a vertical mesh is installed in the gas output chamber, a cotton sheet is installed in the gas output chamber, the gas output chamber is connected with a sampling output pipe, the lower side of the gas output chamber is connected with a liquid displacement valve pipe, a back-suction air pump is installed in the gas collection body, a collection processing unit is installed at the bottom of the gas collection body, the collection processing unit includes a collection processing body, a vertical chamber is provided in the collection processing body, the top of the vertical chamber is connected with the back-suction air pump, a gas filter unit is installed in the vertical chamber, the gas filter unit includes a filter slot plate, and the filter slot plate array is installed with a spacer A gas transmission groove is provided between adjacent spacers, and the gas transmission groove is arranged on the inner wall of the filter slot plate. A functional baffle is installed on the spacer array, and an expanded bottom cavity is provided at the bottom of the vertical cavity. A discharge valve pipe is installed in the expanded bottom cavity, and a liquid filtration module is installed at the bottom of the vertical cavity. The liquid filtration module is connected to a withdrawal valve pipe, and a mounting ring is installed on the upper inner wall of the expanded bottom cavity, and a stirring blade is rotatably installed in the mounting ring, and a mounting cylinder is installed on the lower inner wall of the vertical cavity, and a conical mesh cylinder is rotatably installed in the mounting cylinder, and an inclined guide strip is installed on the inner wall array of the conical mesh cylinder, and the inclined guide strip is regularly arranged with a certain inclination angle.

2. The oil and gas well gas sampling device according to claim 1, characterized in that: The functional baffle is installed with an upward tilt angle.

3. The oil and gas well gas sampling device according to claim 1, characterized in that: A heating module is installed on the inner wall of the top of the gas collection body. A heat-conducting block is installed on the heating module. The heat-conducting block is in contact with the vertical mesh and the cotton sheet. A heat-conducting wire is connected to the heating module.

4. The oil and gas well gas sampling device according to claim 3, characterized in that: A heat conducting sheet is installed in the filter slot plate, and the heat conducting sheet is connected to the heat conducting wire. A heating wire is connected in the functional baffle, and the heating wire is connected to the heat conducting sheet. The bottom array of the functional baffle is provided with a concave reflux groove.

5. The oil and gas well gas sampling device according to claim 1, characterized in that: Two mounting blocks are symmetrically mounted on the inner wall of the vertical cavity, a liquid baffle plate is rotatably mounted on the mounting block, a return spring is connected to the liquid baffle plate, and the two mounting blocks have a certain height difference.

6. The oil and gas well gas sampling device according to claim 1, characterized in that: The mounting ring is equipped with a transmission motor, the transmission motor is connected to the stirring blade, a transmission shaft is installed on the upper side of the stirring blade, a transmission rod is installed at the bottom of the conical net cylinder, and a transmission belt is connected between the transmission rod and the transmission shaft.

7. The oil and gas well gas sampling device according to claim 1, characterized in that: The gas collecting body is equipped with a fixing frame.

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