Gas concentration diluting device for well logging

Abstract

The invention relates to the technical field of logging, in particular to a gas concentration dilution device for logging, which comprises a sampling dilution cylinder, a first piston is arranged in the sampling dilution cylinder, the sampling dilution cylinder is divided into a sampling cavity and a dilution cavity by the first piston, the dilution cavity is provided with a dilution material, and the sampling cavity is connected with a detection device. The bottom of the sampling cavity is connected with a sampling pipe, a lifting pipe is arranged in a pipe cavity of the sampling pipe, a second piston is arranged in the lifting pipe, the top end of the second piston is connected with a piston rod, the top end of the piston rod penetrates through the dilution cavity to reach the outside of the top of the dilution cavity, and the top end of the lifting pipe is provided with a limiting part forming a limiting relation with the second piston; a lifting hole is formed in the top end of the lifting pipe, through simple operation of pulling the piston rod upwards, after sample detection is completed, the dilution process of residual high-concentration gas in the sampling cavity can be automatically triggered, additional operation steps or special equipment is not needed, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mud logging, and particularly to a gas concentration dilution device for mud logging. Background Art

[0002] During the process of petroleum geological mud logging, it is crucial to detect the concentration of the gas (such as hydrocarbon gas) released from the drilling fluid in real time to determine the hydrocarbon-bearing situation of the formation. In order to obtain accurate gas concentration data, it is usually necessary to dilute the high-concentration original gas sample to the optimal range of the detection instrument (such as a chromatograph).

[0003] Common dilution methods include: manual dilution: the operator uses a syringe to extract a certain amount of gas sample and a certain amount of dilution gas (such as air) and mixes them manually. This method is inefficient, cumbersome to operate, prone to introducing human errors, and after detecting a high-concentration gas sample, the residual gas needs to be processed in additional steps, posing a risk of secondary pollution or safety, and affecting the subsequent sampling efficiency.

[0004] Therefore, in the prior art, there is a lack of a device that can automatically, quickly, and conveniently dilute the high-concentration gas remaining in the sampling chamber after gas concentration detection, and it is impossible to effectively improve the overall working efficiency and operation convenience of mud logging gas detection. Summary of the Invention

[0005] To solve the above problems, the present invention provides a gas concentration dilution device for mud logging, which includes a sampling and dilution cylinder. A first piston is arranged inside the sampling and dilution cylinder, and the sampling and dilution cylinder is divided into a sampling chamber and a dilution chamber by the first piston. There is dilution material in the dilution chamber. A detection device is connected to the sampling chamber, and a sampling tube is connected to the bottom of the sampling chamber. A lifting tube is arranged inside the lumen of the sampling tube. A second piston is arranged inside the lifting tube. The top end of the second piston is connected to a piston rod, and the top end of the piston rod passes through the dilution chamber to the outside of the top of the dilution chamber. A limiting part for forming a limiting relationship with the second piston is arranged at the top end of the lifting tube. A lifting hole is opened at the top end of the lifting tube. A dilution tube assembly is connected to the second piston. When the second piston moves upward to the limiting part, it forms a squeezing relationship with the limiting part, and drives the lifting tube and the first piston to rise through the squeezing relationship. When the lifting hole enters the sampling chamber, the dilution tube assembly is automatically opened at the same time.

[0006] As a further preferred embodiment, a sampling part is arranged at the bottom end of the sampling chamber. The bottom end of the sampling part is closed, and a plurality of sampling holes are arranged along its closed contour.

[0007] As a further preference, a first through hole is provided at the top end of the lifting pipe, a second through hole is formed in the first piston, a guide rod is fixed to the top of the first piston, a third through hole is formed at the top end of the sampling and dilution cylinder, a fourth through hole runs through the guide rod, the first through hole, the second through hole, the third through hole and the fourth through hole are coaxial, and the piston rod sequentially passes through the first through hole, the second through hole and the fourth through hole and extends beyond the top end of the guide rod.

[0008] As a further preference, a stepped surface is provided at one end of the limiting part located inside the lifting pipe, a buffer spring is provided between the stepped surface and the second piston. When the second piston rises, it pushes the buffer spring to compress upward, and uses the top end of the buffer spring to push the stepped surface, and while pushing the lifting pipe to rise through the stepped surface, it also pushes the first piston to rise through the top end of the lifting pipe.

[0009] As a further preference, the top end of the dilution chamber is closed, the top end of the guide rod extends outside the top of the dilution chamber through the third through hole formed at the top end of the sampling and dilution cylinder, a return spring is filled in the dilution chamber, the top end of the return spring elastically abuts against the closing part at the top end of the dilution chamber, the bottom end of the return spring elastically abuts against the top surface of the first piston, and the return spring is sleeved around the periphery of the guide rod.

[0010] As a further preference, a lifting hole is horizontally formed in the lifting pipe and penetrates both sides of the lifting pipe, and the lifting hole is located at the bottom of the stepped surface.

[0011] As a further preference, the sampling and dilution cylinder is a transparent plastic pipe.

[0012] As a further preference, a limiting ring is fixed inside the sampling pipe, the limiting ring is located above the sampling hole, and the bottom end of the lifting pipe is restricted on the limiting ring.

[0013] As a further preference, the dilution pipe assembly includes a dilution release pipe connected to the first piston, the dilution pipe assembly further includes a compensation pipe, the dilution release pipe extends vertically downward into the sampling chamber, the compensation pipe is sleeved inside the dilution release pipe, and a plurality of dilution holes are formed in the compensation pipe along the length direction of the compensation pipe.

[0014] As a further preference, there are a plurality of dilution release pipes, and they are annularly arranged on the first piston. A compensation pipe is provided in each dilution release pipe, and a one-way valve is installed on each dilution release pipe.

[0015] The beneficial effects of the present invention compared with the prior art are: Efficient and automatic dilution: By simply pulling up the piston rod, after the sample detection is completed, the dilution process of the residual high-concentration gas in the sampling chamber can be automatically triggered, without additional operation steps or special equipment, greatly improving the work efficiency.

[0016] Easy operation: The entire sampling, testing and dilution process can be completed by operating a single piston rod (push and pull action), which greatly simplifies the operation process and reduces the skill requirements of the operator.

[0017] Reduce contamination risk: Rapid and automatic dilution of residual gas significantly reduces the risk of accidental release of high-concentration residual gas or cross-contamination of subsequent sampling, improving laboratory environmental safety and data accuracy.

[0018] Compact and reliable structure: The dilution function is automatically triggered by the piston linkage and limit squeeze mechanism. The structure is relatively simple and the action is reliable, making it easy to use in a small logging equipment room or on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional schematic diagram of a gas concentration dilution device for mud logging provided in an embodiment of the present invention; Figure 2 A schematic diagram of a cross-section of a gas concentration dilution device for mud logging provided by an embodiment of the present invention; Figure 3 The gas concentration dilution device for logging provided by the embodiment of the present invention is composed of Figure 2 The enlarged schematic diagram of part A is shown; Figure 4 A schematic diagram of a gas concentration dilution device for mud logging provided by an embodiment of the present invention after being cut apart from a three-dimensional perspective; Figure 5 The gas concentration dilution device for logging provided by the embodiment of the present invention is composed of Figure 4 The enlarged schematic diagram of part B is shown; Figure 6 The gas concentration dilution device for logging provided by the embodiment of the present invention is composed of Figure 4 Enlarged schematic diagram of part C.

[0020] In the figure: 10, sampling and dilution cylinder; 110, first piston; 112, sampling chamber; 113, dilution chamber; 114, sampling tube; 115, lifting tube; 116, second piston; 117, piston rod; 118, limiting part; 119, lifting hole; 1121, sampling part; 1122, sampling hole; 1151, first through hole; 1101, second through hole; 1102, guide rod; 101, third through hole; 1103, fourth through hole; 1181, stepped surface; 1182, buffer spring; 1131, return spring; 1111, dilution release tube; 1112, compensation tube; 1113, dilution hole; 1114, one-way valve. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the above and other embodiments and advantages of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only partial embodiments of the present invention, rather than all embodiments.

[0022] In one embodiment, as Figures 1-6 shown: This embodiment provides a gas concentration dilution device for mud logging, including a sampling and dilution cylinder 10. Inside the sampling and dilution cylinder 10, there is a first piston 110. The sampling and dilution cylinder 10 is divided into a sampling chamber 112 and a dilution chamber 113 by the first piston 110. The dilution chamber 113 contains a dilution material, and the dilution material is pure air. A detection device is connected to the sampling chamber 112. A sampling pipe 114 is connected to the bottom of the sampling chamber 112. Inside the lumen of the sampling pipe 114, there is a lifting pipe 115. Inside the lifting pipe 115, there is a second piston 116. The top of the second piston 116 is connected to a piston rod 117. The top of the piston rod 117 passes through the dilution chamber 113 and reaches outside the top of the dilution chamber 113. At the top of the lifting pipe 115, there is a limiting portion 118 that forms a limiting relationship with the second piston 116. A lifting hole 119 is opened at the top of the lifting pipe 115. A dilution pipe assembly 111 is connected to the second piston 116. When the second piston 116 moves upward to the limiting portion 118, it forms a squeezing relationship with the limiting portion 118, and drives the lifting pipe 115 and the first piston 110 to rise through the squeezing relationship. When the lifting hole 119 enters the sampling chamber 112, the dilution pipe assembly 111 is automatically opened at the same time.

[0023] Inside the sampling and dilution cylinder 10, there is a first piston 110, which divides it into an upper sampling chamber 112 and a lower dilution chamber 113. The dilution chamber 113 is pre-filled with a dilution material (such as pure air). The bottom of the dilution chamber 113 is connected to the sampling pipe 114. During use, the sampling pipe 114 is inserted into the well to be detected, so that the bottom end of the sampling pipe 114 reaches or approaches the bottom of the well. The lifting pipe 115 is sleeved inside the lumen of the sampling pipe 114 and is inserted into the well together with the sampling pipe 114. The second piston 116 is located inside the lifting pipe 115, and its top is connected to the piston rod 117. The piston rod 117 passes upward through the dilution chamber 113 (usually there is a seal at the top of the dilution chamber 113, not shown in the figure) and extends outside the cylinder. A lifting hole 119 is opened at the top of the lifting pipe 115. The dilution pipe assembly 111 is connected to the bottom of the second piston 116. When the first piston 110 is in a lower position, the volume of the sampling chamber 112 is smaller; when the second piston 116 does not contact the limiting portion 118; the lifting hole 119 is located inside the dilution chamber 113 or lower; the dilution pipe assembly 111 is in a closed state.

[0024] The gas concentration dilution device for mud logging is described and demonstrated through multiple steps: Sampling operation (such as Figure 2As shown in the figure, the operator pushes the piston rod 117 downward. The piston rod 117 drives the second piston 116 to move downward, causing the second piston 116 to approach the bottom end of the sampling tube 114 along the lumen of the lifting tube 115. That is, at this time, the second piston 116 descends from the sampling chamber 112 along the lumen of the lifting tube 115 to approach the bottom end of the sampling tube 114. The piston rod 117 is lifted upward, and the second piston 116 is lifted upward by the piston rod 117, causing the second piston 116 to rise along the lumen of the lifting tube 115. According to the piston assembly principle, a negative pressure is formed inside the lifting tube 115 at this time, and this negative pressure effect is transmitted to the bottom end of the sampling tube 114. As the second piston 116 continues to rise, a part of the gas in the well is sucked into the sampling tube 114 through the negative pressure effect at the bottom end of the sampling tube 114, and finally lifted to the sampling chamber 112 through the lifting hole 119 after the second piston 116 rises. At the same time, the second piston 116 reaches the limiting part 118.

[0025] Detection stage (for reference Figure 3 , Figure 5 ): Keep the position of the piston rod 117 stationary. Through a detection device (such as a six-way valve injection loop of a chromatograph) connected to the detection device interface, the high-concentration gas sample in the sampling chamber 112 is extracted or transported to the detection device for concentration analysis.

[0026] Automatic dilution operation (such as Figure 3 , Figure 5As shown in the figure: After the detection is completed, the operator continues to pull the piston rod 117 upward. The piston rod 117 drives the second piston 116 to continue moving upward along the lifting tube 115. When the second piston 116 moves upward to its top end and abuts against and squeezes the limiting part 118 at the top end of the lifting tube 115 (at this time, a tight squeezing contact or mechanical engagement is formed between the second piston 116 and the limiting part 118), a linkage relationship is established between the two. Continuing to pull the piston rod 117 upward, due to the squeezing linkage between the second piston 116 and the limiting part 118, the entire lifting tube 115 will be driven to move upward. As the lifting tube 115 moves upward, the lifting hole 119 at its top end will rise and enter the sampling chamber 112. At the same time, the upward movement of the lifting tube 115 will drive the first piston 110 to move upward (for example, the top end of the lifting tube 115 abuts against the lower surface of the first piston 110, or through other linkage structures), thereby compressing the volume of the dilution chamber 113, while the sampling chamber 112 becomes larger. The lifting hole 119 is always located in the sampling chamber 112 and continues to supply gas samples to the sampling chamber 112. At the same time or instantaneously when the second piston 116 moves upward and finally squeezes the limiting part 118, this squeezing force will drive the dilution tube assembly 111 to automatically open (for example, the valve core inside the dilution tube assembly 111 is pushed open, the sealing plug is squeezed and broken, or the valve is pushed open). After the dilution tube assembly 111 is opened, the dilution material (gas) compressed in the dilution chamber 113, under the action of pressure, flows through the opened dilution tube assembly 111, enters the inside of the lifting tube 115, and then passes through the lifting hole 119, and finally is sprayed into the sampling chamber 112 at high speed. The dilution material is quickly and fully mixed and diluted with the high-concentration gas remaining in the sampling chamber 112, reducing the concentration of the sample gas to a safe level. During the dilution process, the detection device still conducts detection, and the detection data at this time changes as the concentration of the sample gas becomes lower, that is, the synchronous dilution method is used to detect the ability of the sample to respond to dilution treatment, thereby further improving its detection effect. After the gas in the sampling chamber 112 is diluted, reset all the components in the device to the initial state ( Figure 1 ), and prepare for the next sampling operation.

[0027] High-efficiency automatic dilution: By simply pulling the piston rod upward, after the sample detection is completed, the dilution process of the high-concentration gas remaining in the sampling chamber can be automatically triggered, without additional operation steps or special equipment, greatly improving the work efficiency.

[0028] Simple operation: The entire sampling, detection, and dilution process can be completed by operating a single piston rod (push-pull action), greatly simplifying the operation process and reducing the requirements for the skills of the operator.

[0029] Reduce the risk of contamination: Quickly and automatically dilute the residual gas, significantly reducing the risk of accidental release of high-concentration residual gas or cross-contamination to subsequent sampling, improving the safety of the laboratory environment and the accuracy of data.

[0030] Compact and reliable structure: The automatic trigger of the dilution function is realized by using the piston linkage and limit extrusion mechanism. The structure is relatively simple, the action is reliable, and it is convenient to use in a narrow mud logging instrument room or on-site.

[0031] A sampling part 1121 is provided at the bottom end of the sampling chamber 112. The bottom end of the sampling part 1121 is closed, and a number of sampling holes 1122 are arranged along its closed contour.

[0032] As Figures 2 to 5 shown, the top end of the guide rod 1102 extends outside the top of the dilution chamber 113 through the third through hole 101 opened at the top end of the sampling and dilution cylinder 10 (transparent plastic tube). The top end of the lifting tube 115 is provided with a first through hole 1151. A second through hole 1101 is opened on the first piston 110. A guide rod 1102 is fixed to the top of the first piston 110. A third through hole 101 is opened at the top end of the sampling and dilution cylinder 10. A fourth through hole 1103 runs through the guide rod 1102. The first through hole 1151, the second through hole 1101, the third through hole 101 and the fourth through hole 1103 are coaxial. The piston rod 117 sequentially passes through the first through hole 1151, the second through hole 1101 and the fourth through hole 1103 and extends outside the top end of the guide rod 1102. When the piston rod 117 moves upward, through the positioning and guiding effects of the above-mentioned multiple through holes and the guide rod 1102, the smoothness is improved. In order to reasonably assemble the piston rod 117 and make the structure more compact, these through holes are arranged on the same axis from top to bottom.

[0033] As Figures 2 to 5 shown, one end of the limiting part 118 located inside the lifting tube 115 is provided with a stepped surface 1181. A buffer spring 1182 is provided between the stepped surface 1181 and the second piston 116. When the second piston 116 rises, it pushes the buffer spring 1182 upward to compress, and uses the top end of the buffer spring 1182 to push the stepped surface 1181, and drives the lifting tube 115 to rise through the stepped surface 1181, so that the top end of the lifting tube 115 is stressed and pushes the first piston 110 to rise synchronously. The limiting part 118 adopts the stepped surface 1181 to form a lifting relationship with the second piston 116. The structure is simple. Moreover, through this cooperation method, after the sample is extracted from the bottom of the well to the sampling chamber 112 by the upward movement of the second piston 116, then by the way of continuing to lift the lifting tube 115 in linkage, the rapid upward movement of the first piston 110 is completed, so that the dilution material in the dilution chamber 113 quickly enters the sampling chamber 112 to complete dilution, and the operation is more convenient.

[0034] A limiting ring 1141 is fixed inside the sampling tube 114. The limiting ring 1141 is located above the sampling hole 1122. The bottom end of the lifting tube 115 is restricted on the limiting ring 1141. The limiting ring 1141 forms a restriction on the bottom end of the lifting tube 115 and is also the maximum limit position after the lifting tube 115 descends. The lifting tube 115 plays a guiding role in the descent of the second piston 116. When the second piston 116 rises to contact the stepped surface 1181, the lifting tube 115 and the stepped surface 1181 form a linkage for the continuous upward movement of the second piston 116, and the synchronous upward movement of the lifting tube 115 is used to push the first piston 110 upward.

[0035] As Figure 3 As shown, the top end of the dilution chamber 113 is closed, and the dilution chamber 113 is in a relatively closed state. However, it cannot be excluded that the top end will be set as movable during actual assembly to open the top end to supplement dilution materials, or a supplement tube is provided at the top end to supplement dilution materials to the dilution chamber 113. However, a gas one-way valve needs to be provided on the supplement tube. When the first piston 110 rises, the gas one-way valve closes, forcing the dilution materials in the dilution chamber 113 to be discharged into the sampling chamber 112 only through the dilution tube assembly 111. It can also be seen from the figure that a return spring 1131 is filled in the dilution chamber 113. The top end of the return spring 1131 elastically abuts against the closed part at the top end of the dilution chamber 113, and the bottom end of the return spring 1131 elastically abuts against the top surface of the first piston 110. The return spring 1131 is sleeved around the outer periphery of the guide rod 1102. When the first piston 110 rises, it pushes the return spring 1131 to compress and shorten, and the dilution chamber 113 gradually becomes smaller. At the same time, the return spring 1131 stores elastic force in the dilution chamber 113. After the sampling and dilution work is completed, the return spring 1131 pushes the first piston 110 to descend, waiting for the next repeated use.

[0036] As Figure 3 As shown, the lifting hole 119 is horizontally opened on the lifting tube 115 and penetrates both sides of the lifting tube 115. The lifting hole 119 is located at the bottom of the stepped surface 1181. The lifting hole 119 is not limited to one, and can also be multiple in an annular array. When the second piston 116 is lifted above the lifting hole 119, the bottom-hole gas sample is extracted into the sampling chamber 112 through the lifting hole 119 by the negative pressure suction inside the lifting tube 115. The gas sample mentioned here does not exclude the method of using negative pressure suction to lift a part of the bottom-hole water body to the position of the lifting hole 119, and then discharging it into the sampling chamber 112 through the lifting hole 119. When the gas exists in the water body and is discharged into the sampling chamber 112 with the water body, it can also be detected by the detection device. It cannot be excluded that a discharge tube is provided at a suitable position in the sampling chamber 112, and a valve is provided on the discharge tube to discharge the sample after detection. This discharge structure is an existing technology and will not be elaborated here.

[0037] As Figure 3, Figure 5 As shown in Figure 5 , the dilution tube assembly 111 includes a dilution release tube 1111 connected to the first piston 110. The dilution tube assembly 111 further includes a compensation tube 1112. The dilution release tube 1111 extends vertically downward into the sampling chamber 112. The compensation tube 1112 is sleeved inside the dilution release tube 1111. A number of dilution holes 1113 are formed in the compensation tube 1112 along the length direction of the compensation tube 1112. There are several dilution release tubes 1111, which are annularly arrayed on the first piston 110. A compensation tube 1112 is provided in each dilution release tube 1111, and a one-way valve 1114 is installed on each dilution release tube 1111. For example, when the first piston 110 rises, the volume of the sampling chamber 112 becomes larger, while the volume of the dilution chamber 113 becomes smaller. At the same time, the air pressure in the dilution chamber 113 becomes larger and pushes open the one-way valve 1114. At this time, the dilution material in the dilution chamber 113 enters the compensation tube 1112 through the dilution release tube 1111. Along with the length of the compensation tube 1112 extending out of the dilution release tube 1111, the dilution material is discharged into the sampling chamber 112 through these dilution holes 1113 on the compensation tube 1112, completing the dilution of the sample gas in the sampling chamber 112.

[0038] The above orientation references do not represent the specific orientations of the components in this embodiment. This embodiment is only for the convenience of describing the solution and is set with relative descriptions referring to the orientations in the figure. In essence, the specific orientations of the components are based on their actual installation, actual use, and the habitual orientation descriptions of those skilled in the art. This is hereby stated.

[0039] The specific implementation manners described above have further elaborated on the invention purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are only the specific implementation manners of the present invention and are not used to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas concentration dilution device for mud logging, characterized in that, It includes a sampling and dilution cylinder (10). Inside the sampling and dilution cylinder (10), there is a first piston (110). The sampling and dilution cylinder (10) is divided into a sampling chamber (112) and a dilution chamber (113) by the first piston (110). The dilution chamber (113) contains dilution material. A detection device is connected to the sampling chamber (112). A sampling tube (114) is connected to the bottom of the sampling chamber (112). Inside the lumen of the sampling tube (114), there is a lifting tube (115). Inside the lifting tube (115), there is a second piston (116). The top end of the second piston (116) is connected to a piston rod (117). The top end of the piston rod (117) passes through the dilution chamber (113) and reaches outside the top of the dilution chamber (113). At the top end of the lifting tube (115), there is a limiting portion (118) that forms a limiting relationship with the second piston (116). A lifting hole (119) is opened at the top end of the lifting tube (115). A dilution tube assembly (111) is connected to the second piston (116). When the second piston (116) moves upward to the limiting portion (118), it forms a squeezing relationship with the limiting portion (118), and drives the lifting tube (115) and the first piston (110) to rise through the squeezing relationship. When the lifting hole (119) enters the sampling chamber (112), the dilution tube assembly (111) is automatically opened at the same time.

2. The gas concentration dilution device for mud logging according to claim 1, characterized in that, At the bottom end of the sampling chamber (112), there is a sampling portion (1121). The bottom end of the sampling portion (1121) is closed, and a number of sampling holes (1122) are opened along its closed contour.

3. The gas concentration dilution device for mud logging according to claim 2, wherein, At the top end of the lifting tube (115), there is a first through hole (1151). On the first piston (110), there is a second through hole (1101). A guide rod (1102) is fixed to the top of the first piston (110). At the top end of the sampling and dilution cylinder (10), there is a third through hole (101). A fourth through hole (1103) runs through the guide rod (1102). The first through hole (1151), the second through hole (1101), the third through hole (101), and the fourth through hole (1103) are coaxial. The piston rod (117) passes through the first through hole (1151), the second through hole (1101), and the fourth through hole (1103) in sequence and extends outside the top end of the guide rod (1102).

4. The gas concentration dilution device for mud logging according to claim 3, wherein, At one end of the limiting portion (118) located inside the lifting tube (115), there is a stepped surface (1181). Between the stepped surface (1181) and the second piston (116), there is a buffer spring (1182). When the second piston (116) rises, it pushes the buffer spring (1182) to compress upward, and uses the top end of the buffer spring (1182) to push the stepped surface (1181). When pushing the stepped surface (1181) to drive the lifting tube (115) to rise, it also drives the first piston (110) to rise through the top end of the lifting tube (115).

5. The gas concentration dilution device for mud logging according to claim 4, characterized in that, The top of the dilution chamber (113) is closed. The top of the guide rod (1102) extends outside the top of the dilution chamber (113) through the third through hole (101) opened at the top of the sampling and dilution cylinder (10). The dilution chamber (113) is filled with a return spring (1131). The top of the return spring (1131) elastically abuts against the top closing part of the dilution chamber (113), and the bottom of the return spring (1131) elastically abuts against the top surface of the first piston (110). The return spring (1131) is sleeved around the guide rod (1102).

6. The gas concentration dilution device for mud logging according to claim 5, characterized in that The lifting hole (119) is horizontally opened on the lifting tube (115) and penetrates both sides of the lifting tube (115). The lifting hole (119) is located at the bottom of the stepped surface (1181).

7. The gas concentration dilution device for mud logging according to claim 6, characterized in that, The sampling and dilution cylinder (10) is a transparent plastic tube.

8. The gas concentration dilution device for mud logging according to claim 7, characterized in that, A limiting ring (1141) is fixed inside the sampling tube (114). The limiting ring (1141) is located above the sampling hole (1122). The bottom end of the lifting tube (115) is restricted on the limiting ring (1141).

9. The gas concentration dilution device for mud logging according to claim 8, characterized in that, The dilution tube assembly (111) includes a dilution release tube (1111) connected to the first piston (110). The dilution tube assembly (111) further includes a compensation tube (1112). The dilution release tube (1111) extends vertically downward into the sampling chamber (112). The compensation tube (1112) is sleeved inside the dilution release tube (1111). A plurality of dilution holes (1113) are opened on the compensation tube (1112) along the length direction of the compensation tube (1112).

10. The gas concentration dilution device for mud logging according to claim 9, characterized in that, There are a plurality of dilution release tubes (1111), which are annularly arrayed on the first piston (110). Each dilution release tube (1111) is provided with a compensation tube (1112). A one-way valve (1114) is installed on each dilution release tube (1111).

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