Air drilling gas sample filtering device

Abstract

The utility model relates to an air drilling gas sample filtering device, and relates to the technical field of oil exploration. The air drilling gas sample filtering device comprises a gas collecting box, an anti-overflow pipe and a dryer, the gas collecting box comprises a box body, a gas inlet pipe and a gas outlet pipe, the gas inlet pipe and the gas outlet pipe are arranged on the box body, water is contained in the box body, the anti-overflow pipe is vertically arranged, the bottom of the anti-overflow pipe is connected with one end of the gas outlet pipe, and the top of the anti-overflow pipe is connected with the dryer. The anti-overflow pipe comprises a pipe body, a floating ball and a valve, the floating ball is arranged in the pipe body, the valve is arranged on the top of the pipe body, and the floating ball closes the valve by making contact with the valve. Dust and other impurities in formation gas can be removed through the gas collection tank, then water vapor is removed through the dryer, a dry and clean gas sample is generated for detection, and the stability of a gas analysis unit and the accuracy of an analysis result are guaranteed. The anti-overflow pipe can prevent water in the gas collection tank from entering the gas analysis unit under an unexpected condition, so that the gas analysis unit is protected.

Description

Technical Field

[0001] This utility model relates to the field of petroleum exploration technology, and in particular to an air drilling gas sample filtration device. Background Technology

[0002] Air drilling, as a new drilling technology, is widely used in drilling operations due to its significant advantage in improving drilling efficiency. The working principle of air drilling involves injecting gas into the well, where the momentum of the annular gas breaks up drill cuttings and brings them to the surface. Using air as the working medium, an air compressor first compresses the air, then cools and removes water. A booster compressor then compresses the air to the required drilling pressure, and the high-pressure air is forced into the drill string through a riser tee. The compressed air cools the drill bit and carries the drill cuttings back to the wellhead. Sand samples are obtained using a cuttings sampler on the sand removal line, and gas from the formation is obtained using a dedicated sampling port. A dust collector removes dust from the drill cuttings, which is then discharged into a settling tank through a dedicated manifold.

[0003] Gas logging is a crucial method for detecting oil and gas shows in integrated logging operations. The gas logging line delivers sample gas to the gas analysis unit of the integrated logging instrument via a gas gathering device. The total hydrocarbon content and hydrocarbon component content of the sample gas are detected to monitor oil and gas shows and analyze the formation's oil and gas content. The gas analysis unit is the most important equipment in the gas logging process; its operational stability directly affects the accuracy of the sample gas analysis results, thus requiring a high level of precision in the sample gas pretreatment process. Chinese Patent CN105587278A discloses a gas drilling gas filtration device that uses a filter tank to filter the mixture returned from the well to obtain the formation gas to be detected. However, this device only uses liquid filtration, and the filtered gas is not dry, which adversely affects the stability of the gas analysis unit, leading to unreliable accuracy of the analysis results. Utility Model Content

[0004] This invention provides an air drilling gas sample filtration device that can fully filter formation gas to obtain clean and dry sample gas, ensuring the stability of the gas analysis unit and the accuracy of the analysis results.

[0005] This utility model provides an air drilling gas sample filtration device, including a gas collection box, an overflow prevention pipe, and a dryer. The gas collection box includes a box body and an air inlet pipe and an air outlet pipe disposed on the box body. The box body is filled with water. The overflow prevention pipe is vertically arranged, with its bottom connected to one end of the air outlet pipe and its top connected to the dryer. The overflow prevention pipe includes a pipe body, a float, and a valve. The float is disposed inside the pipe body, and the valve is disposed at the top of the pipe body. The float closes the valve by contacting the valve.

[0006] In one embodiment, the valve includes a valve body, a valve core, and a valve stem. The valve core is fixedly disposed on the valve body and has an air hole. The valve body has a through hole. The valve stem is movably disposed on the valve body. One end of the valve stem is located outside the valve body, and the other end of the valve stem is located inside the valve body and can be inserted into the air hole to block the air hole.

[0007] In one embodiment, the overflow prevention pipe further includes an upper connector and a lower connector respectively disposed at both ends of the pipe body, one end of the upper connector being located inside the pipe body and connected to the valve core.

[0008] In one embodiment, the inner wall of the air hole is provided with threads, and the valve core is threadedly connected to the upper connector.

[0009] In one embodiment, the dryer includes a drying tube and a desiccant filled inside the drying tube.

[0010] In one embodiment, a pre-filter is also provided at the end of the air intake pipe away from the housing.

[0011] In one embodiment, the pre-filter includes a housing and degreased cotton filling the interior of the housing.

[0012] In one embodiment, the pre-filter is provided with at least two pre-filters, and each pre-filter is arranged in series.

[0013] In one embodiment, the top of the box is provided with a water inlet valve, and the bottom of the box is provided with a drain valve.

[0014] In one embodiment, a vent valve is also provided on the top of the housing.

[0015] Compared with existing technologies, the advantages of this invention are that the formation gas can pass through the gas collection box to remove dust and other impurities, and then pass through a dryer to remove water vapor, producing a dry and clean gas sample for testing, ensuring the stability of the gas analysis unit and the accuracy of the analysis results. When water enters the overflow prevention pipe, the float in the pipe will rise and contact the valve, thereby closing the valve. This prevents water from the gas collection box from entering the gas analysis unit in case of accidental entry, thus protecting the gas analysis unit. Attached Figure Description

[0016] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of the air drilling gas sample filtration device in this embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the anti-overflow pipe in an embodiment of this utility model;

[0019] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0020] Figure label:

[0021] 1. Air collection box; 11. Box body; 12. Air inlet pipe; 13. Air outlet pipe; 14. Water inlet valve; 15. Drain valve; 16. Vent valve; 2. Overflow prevention pipe; 21. Pipe body; 22. Float ball; 23. Valve; 231. Valve body; 2311. Through hole; 232. Valve core; 2321. Air hole; 233. Valve column; 24. Upper connector; 25. Lower connector; 3. Dryer; 31. Drying pipe; 4. Pre-filter; 41. Housing. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figure 1 As shown, the air drilling gas sample filtration device of this embodiment includes a gas collection box 1, an overflow prevention pipe 2, and a dryer 3. The gas collection box 1 includes a box body 11 and an air inlet pipe 12 and an air outlet pipe 13 disposed on the box body 11. The box body 11 is filled with water ( Figure 1 (The dotted line in the diagram represents the water surface). The overflow prevention pipe 2 is installed vertically, with its bottom connected to one end of the air outlet pipe 13 and its top connected to the dryer 3. For example... Figure 2 As shown, the overflow prevention pipe 2 includes a pipe body 21, a float 22, and a valve 23. The float 22 is located inside the pipe body 21, and the valve 23 is located at the top of the pipe body 21. The float 22 closes the valve 23 by contacting the valve 23.

[0024] The gas analysis unit of the integrated logging tool (not shown in the figure) often uses a precision instrument such as a chromatograph. Formation gas passes through the gas collection box 1 to remove dust and other impurities, and then through the dryer 3 to remove water vapor, producing a dry and clean gas sample for testing, ensuring the stability of the gas analysis unit and the accuracy of the analysis results. When water enters the overflow prevention pipe 2, the float 22 in the pipe body 21 will rise and contact the valve 23, thereby closing the valve 23. This prevents water from the gas collection box 1 from entering the gas analysis unit in case of accidental entry, thus protecting the gas analysis unit.

[0025] like Figure 3As shown, valve 23 includes valve body 231, valve core 232, and valve stem 233. Valve core 232 is fixedly mounted on valve body 231 and has an air hole 2321. Valve body 231 has a through hole 2311. Valve stem 233 is movably mounted on valve body 231. One end of valve stem 233 is located outside valve body 231, and the other end is located inside valve body 231 and can be inserted into air hole 2321 to block air hole 2321. When float 22 does not contact valve stem 233, valve stem 233 does not enter air hole 2321, and gas can enter the interior of valve body 231 through through hole 2311 and then flow out through air hole 2321, thus ensuring unobstructed airflow. When water enters the pipe body 21, the float ball 22 will rise to the surface of the water until it contacts the valve stem 233, causing the valve stem 233 to enter the air hole 2321, thereby closing the air passage and preventing water from flowing out of the pipe body 21.

[0026] like Figure 2 As shown, the overflow prevention pipe 2 also includes an upper connector 24 and a lower connector 25 respectively disposed at both ends of the pipe body 21. One end of the upper connector 24 is located inside the pipe body 21 and is connected to the valve core 232. The upper connector 24 and the lower connector 25 facilitate the connection of the overflow prevention pipe 2 to the corresponding pipeline. The valve core 232 is directly connected to the upper connector 24, allowing gas to flow directly into the upper connector 24 through the valve core 232. The structure is simple.

[0027] Furthermore, the inner wall of the vent 2321 is provided with threads, and the valve core 232 is threadedly connected to the upper connector 24. The threaded connection is not only very easy to operate, but also has good sealing performance, thereby preventing gas leakage.

[0028] like Figure 1 As shown, the dryer 3 includes a drying tube 31 and a desiccant (not shown in the figure) filled inside the drying tube 31. The desiccant is silica gel or anhydrous calcium chloride. The drying tube 31 is relatively long and thin, and the gas needs to travel a long distance when flowing through the dryer 3, so that the desiccant inside the drying tube 31 can fully adsorb the water vapor in the gas to obtain a dry gas sample.

[0029] like Figure 1 As shown, a pre-filter 4 is also provided at the end of the air inlet pipe 12 away from the housing 11. The pre-filter 4 can filter the formation gas before it enters the gas collection box 1, reducing the amount of impurities input into the gas collection box 1, keeping the water inside the housing 11 in a relatively clean state, and reducing the frequency of water replacement.

[0030] Furthermore, the pre-filter 4 includes a housing 41 and degreased cotton filled inside the housing 41. The degreased cotton can intercept most of the dust and other impurities in the formation gas, has a low operating cost, and is relatively easy to replace.

[0031] like Figure 1 As shown, there are two pre-filters 4 connected in series to improve the filtration effect. Of course, more pre-filters 4 can also be set to achieve a better filtration effect.

[0032] like Figure 1 As shown, the top of the housing 11 is equipped with a water inlet valve 14, and the bottom of the housing 11 is equipped with a drain valve 15. Water can be injected into the housing 11 through the water inlet valve 14, and the drain valve 15 is used to drain water, thereby realizing the replacement of water inside the housing 11 and the cleaning of the inside of the housing 11.

[0033] Furthermore, the top of the housing 11 is also equipped with a vent valve 16. When water is being added to the housing 11, the vent valve 16 is opened to allow the air inside the housing 11 to be expelled smoothly, so that water can be smoothly injected into the housing 11. After the water is added, the vent valve 16 is closed to prevent gas from escaping.

[0034] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An air drilling gas sample filtration device, characterized in that, The device includes a gas collection box, an overflow prevention pipe, and a dryer. The gas collection box includes a box body and an air inlet pipe and an air outlet pipe disposed on the box body. The box body is filled with water. The overflow prevention pipe is vertically arranged, with its bottom connected to one end of the air outlet pipe and its top connected to the dryer. The overflow prevention pipe includes a pipe body, a float, and a valve. The float is disposed inside the pipe body, and the valve is disposed at the top of the pipe body. The float closes the valve by contacting the valve.

2. The air drilling gas sample filtration device according to claim 1, characterized in that, The valve includes a valve body, a valve core, and a valve stem. The valve core is fixedly mounted on the valve body and has an air hole. The valve body has a through hole. The valve stem is movably mounted on the valve body. One end of the valve stem is located outside the valve body, and the other end of the valve stem is located inside the valve body and can be inserted into the air hole to block the air hole.

3. The air drilling gas sample filtration device according to claim 2, characterized in that, The overflow prevention pipe also includes an upper connector and a lower connector respectively disposed at both ends of the pipe body, one end of the upper connector being located inside the pipe body and connected to the valve core.

4. The air drilling gas sample filtration device according to claim 3, characterized in that, The inner wall of the air hole is threaded, and the valve core is threadedly connected to the upper connector.

5. The air drilling gas sample filtration device according to claim 1, characterized in that, The dryer includes a drying tube and a desiccant filled inside the drying tube.

6. The air drilling gas sample filtration device according to claim 5, characterized in that, A pre-filter is also provided at the end of the air intake pipe away from the housing.

7. The air drilling gas sample filtration device according to claim 6, characterized in that, The pre-filter includes a housing and degreased cotton filling the inside of the housing.

8. The air drilling gas sample filtration device according to claim 6, characterized in that, The pre-filter is provided with at least two pre-filters, and each pre-filter is arranged in series.

9. The air drilling gas sample filtration device according to claim 1, characterized in that, The top of the box is equipped with a water inlet valve, and the bottom of the box is equipped with a drain valve.

10. The air drilling gas sample filtration device according to claim 9, characterized in that, The top of the enclosure is also equipped with a vent valve.

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