Gas concentration dilution device for logging

Abstract

The present invention relates to the technical field of well logging, and in particular provides a gas concentration dilution device for well logging, comprising a sampling dilution cylinder, wherein a first piston is provided inside the sampling dilution cylinder, and the sampling dilution cylinder is divided into a sampling chamber and a dilution chamber by the first piston, the dilution chamber contains dilution material, the sampling chamber is connected to a detection device, the bottom of the sampling chamber is connected to a sampling tube, a lifting tube is provided in the tube cavity of the sampling tube, a second piston is provided in the lifting tube, the top end of the second piston is connected to a piston rod, the top end of the piston rod passes through the dilution chamber to reach outside the top of the dilution chamber, a limiting portion is provided at the top end of the lifting tube that forms a limiting relationship with the second piston, and a lifting hole is provided at the top end of the lifting tube. By simply pulling the piston rod upward, the dilution process of the high-concentration gas remaining in the sampling chamber can be automatically triggered after the sample detection is completed, without the need for additional operating steps or special equipment, thereby greatly improving work efficiency.

Description

Technical Field

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

[0002] During petroleum geological logging, real-time monitoring of the concentration of gases (such as hydrocarbons) released from drilling fluid is crucial for determining the oil and gas content of the formation. To obtain accurate gas concentration data, it is often necessary to dilute high-concentration raw gas samples to within the optimal range of the detection instrument (such as a chromatograph).

[0003] Common dilution methods include: Manual dilution: An operator uses a syringe to extract a certain amount of gas sample and a certain amount of diluent gas (such as air) and manually mixes them. This method is inefficient, cumbersome, and prone to human error. Furthermore, after testing high-concentration gas samples, residual gas requires additional processing, which can pose secondary contamination or safety risks, affecting subsequent sampling efficiency.

[0004] Therefore, the existing technology lacks a device that can automatically, quickly and conveniently dilute the high-concentration gas remaining in the sampling chamber after completing the gas concentration detection, which cannot effectively improve the overall work efficiency and operational convenience of logging gas detection. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a gas concentration dilution device for logging, including a sampling dilution cylinder, a first piston is provided inside the sampling dilution cylinder, and the sampling dilution cylinder is divided into a sampling chamber and a dilution chamber by the first piston. The dilution chamber contains dilution material, and the sampling chamber is connected to a detection device. The bottom of the sampling chamber is connected to a sampling tube, and a lifting tube is provided in the tube cavity of the sampling tube. A second piston is provided in the lifting tube, and the top of the second piston is connected to a piston rod. The top of the piston rod passes through the dilution chamber and reaches outside the top of the dilution chamber. A limiting portion forming a limiting relationship with the second piston is provided at the top of the lifting tube, and a lifting hole is opened at the top of the lifting tube. A dilution tube assembly is connected to the second piston. When the second piston moves upward to the limiting portion, it forms an extrusion relationship with the limiting portion, and drives the lifting tube and the first piston to rise through the extrusion relationship, so that the lifting hole enters the sampling chamber and the dilution tube assembly is automatically opened.

[0006] As a further preference, a sampling portion is provided at the bottom end of the sampling cavity, the bottom end of the sampling portion is closed, and a plurality of sampling holes are opened along the closed contour thereof.

[0007] As a further preferred embodiment, a first through hole is provided at the top of the lifting tube, a second through hole is provided on the first piston, a guide rod is fixed to the top of the first piston, a third through hole is provided at the top of the sampling dilution cylinder, a fourth through hole is passed 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 passes through the first through hole, the second through hole and the fourth through hole in sequence and extends to the outside of the top of the guide rod.

[0008] As a further preferred embodiment, a stepped surface is provided at one end of the limiting portion located in the lifting tube, and a buffer spring is provided between the stepped surface and the second piston. When the second piston rises, the buffer spring is compressed upward, and the top end of the buffer spring is used to push the stepped surface. While pushing the lifting tube up through the stepped surface, the first piston is also pushed up through the top end of the lifting tube.

[0009] As a further preferred embodiment, the top end of the dilution chamber is closed, and the top end of the guide rod extends beyond the top end of the dilution chamber through a third through hole opened at the top end of the sampling dilution cylinder. The dilution chamber is filled with a return spring, and the top end of the return spring elastically contacts the top closed portion of the dilution chamber, and the bottom end of the return spring elastically contacts the top surface of the first piston. The return spring is sleeved on the periphery of the guide rod.

[0010] As a further preferred embodiment, the lifting hole is transversely opened on the lifting pipe and passes through 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 tube is a transparent plastic tube.

[0012] As a further preferred embodiment, a limiting ring is fixed in the sampling tube, the limiting ring is located above the sampling hole, and the bottom end of the lifting tube is limited by the limiting ring.

[0013] As a further preference, the dilution tube combination includes a dilution release tube connected to the first piston, and the dilution tube combination also includes a compensation tube, which extends vertically downward into the sampling chamber. The compensation tube is sleeved in the dilution release tube, and a plurality of dilution holes are opened on the compensation tube along the length direction of the compensation tube.

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

[0015] The beneficial effects of the present invention compared to the prior art are:

[0016] Efficient automated dilution: By simply pulling the piston rod upward, the dilution process of the high-concentration gas remaining in the sampling chamber is automatically triggered after the sample is tested. No additional steps or special equipment are required, greatly improving work efficiency.

[0017] 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.

[0018] 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.

[0019] 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

[0020] Figure 1 A three-dimensional schematic diagram of a gas concentration dilution device for mud logging provided in an embodiment of the present invention;

[0021] 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;

[0022] 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;

[0023] 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;

[0024] 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;

[0025] 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.

[0026] 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

[0027] The above and other embodiments and advantages of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments.

[0028] In one embodiment, Figures 1-6 As shown: This embodiment provides a gas concentration dilution device for logging, including a sampling dilution cylinder 10, a first piston 110 is provided inside the sampling dilution cylinder 10, and the sampling 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, which is pure air. The sampling chamber 112 is connected to a detection device, and the bottom of the sampling chamber 112 is connected to a sampling tube 114. The tube cavity of the sampling tube 114 is provided with a lifting tube 115, and the lifting tube 115 is provided with a second piston 116. The top of the second piston 116 is connected to the piston rod 11 7. The top end of the piston rod 117 passes through the dilution chamber 113 and reaches outside the top of the dilution chamber 113. The top end of the lifting tube 115 is provided with a limiting portion 118 that forms a limiting relationship with the second piston 116. The top end of the lifting tube 115 is provided with a lifting hole 119. The dilution tube assembly 111 is connected to the second piston 116. When the second piston 116 moves upward onto the limiting portion 118, it forms an extrusion relationship with the limiting portion 118. The extrusion relationship drives the lifting tube 115 and the first piston 110 to rise, causing the lifting hole 119 to enter the sampling chamber 112 and the dilution tube assembly 111 to automatically open.

[0029] The sampling and dilution cylinder 10 is equipped with a first piston 110, which divides the cylinder into an upper sampling chamber 112 and a lower dilution chamber 113. The dilution chamber 113 is pre-filled with a dilution material (e.g., pure air). The bottom of the dilution chamber 113 is connected to a sampling tube 114. During use, the sampling tube 114 is inserted into the well to be tested, with the bottom end of the sampling tube 114 at or near the bottom of the well. An elevator tube 115 is inserted into the inner cavity of the sampling tube 114 and inserted into the well along with the sampling tube 114. A second piston 116 is located within the elevator tube 115, with its top end connected to a piston rod 117. The piston rod 117 extends upward through the dilution chamber 113 (typically, a seal is provided at the top of the dilution chamber 113, not shown in the figure) and extends out of the cylinder. The top of the elevator tube 115 is provided with a lifting hole 119. The dilution tube 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 small; when the second piston 116 does not contact the limit portion 118; the lifting hole 119 is located in the dilution chamber 113 or lower; the dilution tube assembly 111 is in a closed state.

[0030] The gas concentration dilution device for mud logging is demonstrated and described in multiple steps:

[0031] Sampling operations (such as Figure 2 As shown in FIG1 , the operator pushes piston rod 117 downward, which drives second piston 116 downward, causing second piston 116 to move along the lumen of lift tube 115 close to the bottom end of sampling tube 114. That is, second piston 116 now descends along the lumen of lift tube 115 from sampling chamber 112 to near the bottom end of sampling tube 114, and then lifts piston rod 117 upward, which in turn lifts second piston 116 upward, causing second piston 116 to rise along the lumen of lift tube 115. According to the piston assembly principle, negative pressure is now formed in lift tube 115 and transmitted to the bottom end of sampling tube 114. As second piston 116 continues to rise, the negative pressure at the bottom end of sampling tube 114 draws some of the gas in the well into sampling tube 114. As second piston 116 rises, it is finally lifted into sampling chamber 112 through lifting hole 119. At the same time, second piston 116 reaches stop 118.

[0032] Detection phase (see Figure 3 、 Figure 5 ): Keep the piston rod 117 in a fixed position. Through the detection device connected to the detection device interface (such as the six-way valve injection ring of the chromatograph, etc.), the high-concentration gas sample in the sampling chamber 112 is extracted or transported to the detection device for concentration analysis.

[0033] Automatic dilution operation (such as Figure 3 、 Figure 5As shown): After the test is completed, the operator continues to pull the piston rod 117 upwards. The piston rod 117 drives the second piston 116 to continue to move upwards along the lifting tube 115. When the second piston 116 moves upwards to its top end and presses the limiting portion 118 at the top end of the lifting tube 115 (at this time, the second piston 116 and the limiting portion 118 form a close extrusion contact or mechanical engagement), the two establish a linkage relationship. Continue to pull the piston rod 117 upwards, and due to the extrusion linkage between the second piston 116 and the limiting portion 118, the lifting tube 115 will be driven to move upward as a whole. The lifting tube 115 moves upward, and the lifting hole 119 at its top rises accordingly and enters the sampling chamber 112. Simultaneously, the upward movement of the lift tube 115 drives the first piston 110 upward (for example, by the top end of the lift tube 115 pressing against the lower surface of the first piston 110, or through some other interlocking mechanism), thereby compressing the volume of the dilution chamber 113 and expanding the sampling chamber 112. The lifting hole 119 remains within the sampling chamber 112 and continues to supply the gas sample to the sampling chamber 112. Simultaneously or instantaneously with the upward movement of the second piston 116 and its eventual compression of the stopper 118, this compression force automatically opens the dilution tube assembly 111 (for example, by the valve core within the dilution tube assembly 111 being pushed open, the sealing plug being squeezed, or the valve being pushed open). Once the dilution tube assembly 111 is opened, the dilution material (gas) compressed within the dilution chamber 113, under pressure, flows through the open dilution tube assembly 111, into the interior of the lift tube 115, and then through the lifting hole 119, ultimately ejecting at high speed into the sampling chamber 112. The dilution material is quickly and fully mixed with the high-concentration gas remaining in the sampling chamber 112 and diluted, reducing the concentration of the sample gas to a safe level. During the dilution process, the detection device still performs detection. At this time, the detection data changes as the concentration of the sample gas decreases. That is, the synchronous dilution method is used to detect the sample's ability to cope with dilution treatment, thereby further improving its detection effect. After the gas in the sampling chamber 112 is diluted, the various components in the device are reset to their initial state ( Figure 1 ), prepare for the next sampling operation.

[0034] Efficient automated dilution: By simply pulling the piston rod upward, the dilution process of the high-concentration gas remaining in the sampling chamber is automatically triggered after the sample is tested. No additional steps or special equipment are required, greatly improving work efficiency.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] A sampling portion 1121 is provided at the bottom of the sampling cavity 112 . The bottom of the sampling portion 1121 is closed, and a plurality of sampling holes 1122 are formed along the closed contour.

[0039] like Figures 2 to 5 As shown, the top end of the guide rod 1102 passes through the third through hole 101 defined at the top end of the sampling and dilution cylinder 10 (transparent plastic tube) and extends to the outside of the top of the dilution chamber 113. The top end of the lifting tube 115 is provided with a first through hole 1151. The first piston 110 is provided with a second through hole 1101. The top end of the first piston 110 is fixed with the guide rod 1102. The top end of the sampling and dilution cylinder 10 is provided with a third through hole 101. The guide rod 1102 is provided with a fourth through hole 1103. 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 to the outside of the top end of the guide rod 1102. When the piston rod 117 is lifted, the positioning and guiding function of the above-mentioned multiple through holes and the guide rod 1102 improves the stability. In order to make the piston rod 117 reasonably assembled and the structure more compact, these through holes are arranged on the same axis from top to bottom.

[0040] like Figures 2 to 5 As shown, one end of the limiting portion 118 located in the lifting tube 115 is provided with a stepped surface 1181, and 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 to compress upward, 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 subjected to force and pushes the first piston 110 to rise synchronously. The limiting portion 118 uses the stepped surface 1181 to form a lifting relationship with the second piston 116, which has a simple structure. Moreover, through this cooperation, after the sample is extracted from the bottom of the well to the sampling chamber 112 through the lifting action of the second piston 116, the first piston 110 is quickly raised by continuing to lift the lifting tube 115 in a linked manner, so that the dilution material in the dilution chamber 113 quickly enters the sampling chamber 112 to complete the dilution, and the operation is more convenient.

[0041] A limit ring 1141 is fixed in the sampling tube 114, and the limit ring 1141 is located above the sampling hole 1122. The bottom end of the lifting tube 115 is limited by the limit ring 1141. The limit ring 1141 limits 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 guides the descent of the second piston 116. When the second piston 116 rises and contacts the step surface 1181, the lifting tube 115 uses the step surface 1181 to form a linkage with the continued ascending action of the second piston 116, and uses the synchronous ascending action of the lifting tube 115 to push the first piston 110 to rise.

[0042] like 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 is not ruled out that during actual assembly, the top end may be configured to be movable, and opened to replenish the dilution material, or a replenishing tube may be provided at the top end to replenish the dilution chamber 113 with the dilution material. However, a gas check valve is required on the replenishing tube. As the first piston 110 rises, the gas check valve closes, forcing the dilution material in the dilution chamber 113 to be discharged into the sampling chamber 112 only through the dilution tube assembly 111. As can also be seen in the figure, the dilution chamber 113 is filled with a return spring 1131. The top end of the return spring 1131 elastically contacts the top closed portion of the dilution chamber 113, and the bottom end of the return spring 1131 elastically contacts 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 down and waits for the next reuse.

[0043] like Figure 3 As shown, a lifting hole 119 is transversely formed on the lifting tube 115 and extends through 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, but may be multiple in a circular array. When the second piston 116 is lifted above the lifting hole 119, the negative pressure suction within the lifting tube 115 is used to extract the bottom hole gas sample through the lifting hole 119 into the sampling chamber 112. The gas sample mentioned here does not exclude the possibility of lifting a portion of the bottom hole water to the position of the lifting hole 119 by negative pressure suction, and then being discharged into the sampling chamber 112 through the lifting hole 119. The gas present in the water and discharged into the sampling chamber 112 along with the water can also be detected by the detection device. It is not excluded that a discharge pipe is provided at an appropriate position in the sampling chamber 112, and a valve is provided on the discharge pipe to discharge the sample after detection. This discharge structure is conventional technology and will not be described in detail.

[0044] like Figure 3、 Figure 5 As shown, the dilution tube assembly 111 includes a dilution release tube 1111 connected to the first piston 110, and the dilution tube assembly 111 also includes a compensation tube 1112. The dilution release tube 1111 extends vertically downward into the sampling chamber 112, and the compensation tube 1112 is sleeved in 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. There are a plurality of dilution release tubes 1111, and the annular array is 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 increases, while the volume of the dilution chamber 113 decreases. At the same time, the air pressure in the dilution chamber 113 increases, and the one-way valve 1114 is pushed open. At this time, the dilution material in the dilution chamber 113 enters the compensation tube 1112 through the dilution release tube 1111. As the compensation tube 1112 extends from the dilution release tube 1111, the dilution material is discharged into the sampling chamber 112 through the dilution holes 1113 on the compensation tube 1112, thereby completing the dilution of the sample gas in the sampling chamber 112.

[0045] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described based on their actual installation and actual use, as well as the customary orientations of those skilled in the art. This is hereby explained.

[0046] The specific embodiments described above further illustrate the purpose of the present invention, technical solutions, and beneficial effects. It should be understood that the above description is merely a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. In particular, it should be noted that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas concentration dilution device for logging, characterized in that: The invention comprises a sampling dilution cylinder (10), wherein a first piston (110) is provided inside the sampling dilution cylinder (10), and the sampling dilution cylinder (10) is divided into a sampling chamber (112) and a dilution chamber (113) by the first piston (110), wherein the dilution chamber (113) contains dilution material, and the sampling chamber (112) is connected to a detection device, and the bottom of the sampling chamber (112) is connected to a sampling tube (114), and a lifting tube (115) is provided in the tube cavity of the sampling tube (114), and a second piston (116) is provided in the lifting tube (115), and the top end of the second piston (116) is connected to a piston rod (117), and the top end of the piston rod (117) passes through the dilution chamber ( 113) reaches the top of the dilution chamber (113), the top end of the lifting tube (115) is provided with a limiting portion (118) that forms a limiting relationship with the second piston (116), the top end of the lifting tube (115) is provided with a lifting hole (119), and the second piston (116) is connected to the dilution tube assembly (111). When the second piston (116) moves upward to the limiting portion (118), it forms an extrusion relationship with the limiting portion (118), and drives the lifting tube (115) and the first piston (110) to rise through the extrusion relationship, so that the lifting hole (119) enters the sampling chamber (112), and the dilution tube assembly (111) is automatically opened; A stepped surface (1181) is provided at one end of the limiting portion (118) located in the lifting tube (115), and a buffer spring (1182) is provided between the stepped surface (1181) and the second piston (116). When the second piston (116) rises, the buffer spring (1182) is pushed upward to be compressed, and the top end of the buffer spring (1182) is used to push the stepped surface (1181). While the lifting tube (115) is pushed upward by the stepped surface (1181), the first piston (110) is also pushed upward by the top end of the lifting tube (115). The dilution tube assembly (111) comprises a dilution release tube (1111) connected to the first piston (110). The dilution tube assembly (111) further comprises a compensation tube (1112). The dilution release tube (1111) extends vertically downward into the sampling cavity (112). The compensation tube (1112) is sleeved inside the dilution release tube (1111). A plurality of dilution holes (1113) are provided on the compensation tube (1112) along the length direction of the compensation tube (1112).

2. The gas concentration dilution device for logging according to claim 1, characterized in that: A sampling portion (1121) is provided at the bottom end of the sampling cavity (112); the bottom end of the sampling portion (1121) is closed, and a plurality of sampling holes (1122) are provided along its closed contour.

3. The gas concentration dilution device for logging according to claim 2, characterized in that: A first through hole (1151) is provided at the top of the lifting tube (115), a second through hole (1101) is provided 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 provided at the top of the sampling dilution cylinder (10), a fourth through hole (1103) is passed 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, and 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 to the outside of the top of the guide rod (1102).

4. The gas concentration dilution device for logging according to claim 3, characterized in that: The top end of the dilution chamber (113) is closed, and 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 dilution cylinder (10). The dilution chamber (113) is filled with a return spring (1131). The top end of the return spring (1131) elastically contacts the top closed portion of the dilution chamber (113), and the bottom end of the return spring (1131) elastically contacts the top surface of the first piston (110). The return spring (1131) is sleeved on the periphery of the guide rod (1102).

5. The gas concentration dilution device for logging according to claim 4, characterized in that: The lifting hole (119) is horizontally opened on the lifting tube (115) and passes through both sides of the lifting tube (115). The lifting hole (119) is located at the bottom of the stepped surface (1181).

6. The gas concentration dilution device for logging according to claim 5, characterized in that: The sampling and dilution cylinder (10) is a transparent plastic tube.

7. The gas concentration dilution device for logging according to claim 6, 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), and the bottom end of the lifting tube (115) is limited on the limiting ring (1141).

8. The gas concentration dilution device for logging according to claim 7, characterized in that: There are a plurality of dilution and release tubes (1111) arranged in an annular array on the first piston (110), a compensation tube (1112) is provided in each dilution and release tube (1111), and a one-way valve (1114) is installed on each dilution and release tube (1111).

Images