Light window module of formation testing instrument

Abstract

The light window module is arranged in an instrument body and comprises a light window base, a light-transmitting optical lens assembly is fixed in the light window base, a light source and an optical fiber are fixed to the two sides of the optical lens assembly respectively, and the optical lens assembly comprises a first optical lens and a second optical lens. The optical window base is provided with a fluid channel between the first optical lens and the second optical lens, and the fluid channel extends linearly and is perpendicular to the length direction of the instrument body. The utility model relates to the field of oil exploration, and provides an optical window module of a formation testing instrument, the flowing direction of fluid is adjusted according to an instrument main body, namely the direction perpendicular to the length direction of the instrument main body, when the fluid flows through an optical lens assembly, water and oil (gas) can be separated through gravity, water is prevented from influencing oil (gas) spectral measurement, and the oil (gas) spectral measurement accuracy is improved.

Description

Technical Field

[0001] The present disclosure relates to, but is not limited to, the field of oil exploration, and more specifically, to an optical window module of a formation testing instrument. Background Art

[0002] Formation testing instruments can analyze the properties and characteristic parameters of formation fluids in real time, effectively predict fluid type and quality, improve sampling quality, and provide important key parameters for oilfield capacity prediction and development. They have important application value in oilfield development operations. Compared with traditional fluid identification technologies such as resistance, conductivity, and density, the advantages of spectral analysis technology are: it can quantitatively analyze the content of each component of the fluid, can effectively distinguish formation fluids from oil-based mud, and has strong anti-interference ability.

[0003] At present, the optical window module of the formation testing instrument has the following disadvantages: first, when the fluid passes through the optical window module and enters the fluid channel, the flow rate slows down, and the original residual fluid cannot be completely replaced; second, there are bends in the optical window module, which easily causes the fluid to flow back; finally, the fluid in the optical window module cannot separate water and oil (gas) by gravity, so that water affects the oil (gas) spectrum measurement. Therefore, the existing optical window module cannot accurately measure the spectrum of the fresh fluid that is constantly flowing in, resulting in the inability to accurately measure the fluid properties. Utility Model Content

[0004] An embodiment of the present disclosure provides a light window module of a formation testing instrument, which is arranged in an instrument body and includes a light window base. A light-transmitting optical lens assembly is fixed in the light window base. A light source and an optical fiber are respectively fixed on two sides of the optical lens assembly. The optical lens assembly includes a first optical lens and a second optical lens. The light window base is provided with a fluid channel between the first optical lens and the second optical lens, and the fluid channel is arranged to extend in a straight line and be perpendicular to the length direction of the instrument body.

[0005] In a possible design, the fluid channel is configured to have a rectangular cross section, a first channel is provided on the light window base, and a second channel is provided on the optical lens assembly. The first channel is connected to the second channel to form the fluid channel.

[0006] In a possible design, a through groove is provided on the end face of the first optical lens facing the second optical lens, and the first optical lens and the second optical lens abut against each other to form the second channel.

[0007] In a possible design, the first channel includes a first pipe segment and a second pipe segment spaced apart from each other, and the first pipe segment, the second channel and the second pipe segment are arranged in sequence to form the fluid channel.

[0008] In a possible design, the light window base is provided with a liquid inlet channel, a first cavity and a liquid outlet channel, one end of the fluid channel and one end of the liquid inlet channel are respectively connected to the first cavity, and the other end of the fluid channel is connected to the liquid outlet channel.

[0009] In a possible design, the light window base is provided with a first mounting cavity and a second mounting cavity on both sides of the fluid channel for mounting the first optical lens and the second optical lens, respectively; the light window base is provided with a third mounting cavity for fixing the light source on the side of the first mounting cavity facing away from the fluid channel, and the light window base is provided with a fourth mounting cavity for fixing the optical fiber on the side of the second mounting cavity facing away from the fluid channel.

[0010] A possible design is that the light window base is provided with a connecting channel, the connecting channel is arranged to be perpendicular to the length direction of the instrument body, the liquid inlet channel and the liquid outlet channel are arranged to be parallel to the length direction of the instrument body, the two ends of the connecting channel are connected to the fluid channel and the liquid outlet channel respectively, and the connecting channel and the fluid channel form a U-shape.

[0011] In a possible design, the light window base is provided with a second cavity connected to the first cavity on a side of the first cavity facing away from the fluid channel, and a first sealing plug is provided in the second cavity;

[0012] The connecting channel includes a third channel and a fourth channel connected to each other, the third channel and the fourth channel form an L-shape, the third channel is connected to the fluid channel, and the light window base is provided with a third cavity connected to the third channel on the side of the third channel facing away from the fluid channel, and a second sealing plug is provided in the third cavity.

[0013] In a possible design, a sealing ring is provided between the first optical lens and the first mounting cavity, and between the second optical lens and the second mounting cavity.

[0014] A possible design includes a mounting base, which is fixed in the instrument body, and the light window base is detachably mounted on the mounting base, and the mounting base is provided with a liquid inlet hole and a liquid outlet hole connected to the liquid inlet channel and the liquid outlet channel.

[0015] The optical window module of the disclosed embodiment adjusts the fluid flow direction according to the instrument body, that is, perpendicular to the length direction of the instrument body. When the fluid flows through the optical lens assembly, gravity can be used to separate water and oil (gas), thereby preventing water from affecting the oil (gas) spectrum measurement and improving the accuracy of oil (gas) spectrum measurement.

[0016] The light window module of the disclosed embodiment adopts a straight and rectangular fluid channel. When the formation fluid passes through the light window and enters the fluid channel, the volume will not change, thereby preventing the fluid from flowing back. The original residual fluid will be completely replaced by the fresh fluid that continuously flows in, thereby enabling the light window to accurately measure the spectrum of the fresh fluid that continuously flows in, thereby improving the accuracy of measuring the properties and characteristic parameters of the formation fluid.

[0017] The light window module of the disclosed embodiment is mainly composed of a light window base, a light window mounting base, an optical fiber, an optical fiber base, an optical lens assembly, a light source, etc. It is simple, practical, and easy to disassemble and assemble.

[0018] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0020] Figure 1 is a cross-sectional schematic diagram of a light window module according to an embodiment of the present disclosure;

[0021] Figure 2 for Figure 1 A second cross-sectional schematic diagram of a light window module;

[0022] Figure 3 for Figure 1 A third cross-sectional schematic diagram of the light window module;

[0023] Figure 4 for Figure 1 Schematic diagram of the disassembly of the light window module;

[0024] Figure 5 for Figure 1 A first schematic diagram of a light window base;

[0025] Figure 6 for Figure 1 A second schematic diagram of a light window base;

[0026] Figure 7 A schematic diagram of a spectrum analysis short section connection according to another embodiment of the present disclosure;

[0027] Figure 8 for Figure 7 Schematic diagram of the pipeline connection of the spectral analysis short section.

[0028] Reference numerals:

[0029] 1 Spectral analysis module, 2 optical fiber, 3 optical fiber locking ring, 4 optical fiber base, 5 optical window base, 5-1 optical fiber base hole, 5-2 light source base hole, 5-3 third cavity, 5-4 second cavity, 5-5 liquid inlet channel, 5-6 liquid outlet channel, 5-7 fluid channel, 5-8 to 5-11 screw holes, 5-12 first sealing groove, 5-13 second sealing groove, 5-14 first cavity, 5-15 third channel, 5-16 fourth channel, 5-17 second channel, 5-18 first channel, 5-19 The first installation cavity, 5-20 the second installation cavity, 5-21 the third installation cavity, 5-22 the fourth installation cavity, 5-23 the avoidance hole, 6 the second sealing plug, 7 the installation base, 8 the first sealing plug, 9 the second optical lens; 10 the first optical lens, 11 the light source base, 12 the light source, 13 the screw, 14 the housing, 14-1 the upper joint, 14-2 the lower joint, 14-3 the light window section, 14-4 the analysis section, 15 the light window module, 16 the first pipeline, 17 the second pipeline, 18 the third pipeline, 19 the two-way hydraulic control valve. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the embodiments of the utility model will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0031] See also Figures 1 to 6 The light window module of the formation testing instrument of the embodiment of the present disclosure. Figures 1 to 6 As shown, the light window module is arranged in the instrument body, including a light window base 5, a light-transmitting optical lens assembly is fixed in the light window base 5, the optical lens assembly constitutes a downhole fluid optical window, and a light source 12 and an optical fiber 2 are respectively fixed on the lower side and the upper side of the optical lens assembly, wherein the optical lens assembly includes a first optical lens 10 and a second optical lens 9, and the light window base 5 is provided with a fluid channel 5-7 between the first optical lens 10 and the second optical lens 9, and the fluid channel 5-7 extends in a straight line and is perpendicular to the length direction of the instrument body. Therefore, the light window module sets the fluid channel 5-7 to adjust the fluid flow direction, that is, perpendicular to the length direction of the instrument body, and when the fluid flows through the optical lens assembly, it can use its own gravity to separate water and oil (gas) in the direction of light source irradiation, prevent water from affecting the oil (gas) spectrum measurement, and improve the accuracy of oil (gas) spectrum measurement.

[0032] like Figure 1 , Figure 3 and Figure 4As shown, the light window module includes a mounting base 7, which is fixed in the instrument body, and the light window base 5 is detachably mounted on the mounting base 7 to form a stable fixation. The light window base 5 is fixed to the mounting base 7 by four screws, and four screw holes 5-8 to 5-11 are correspondingly provided on the light window base 5 and the mounting base 7.

[0033] Another example Figures 1 to 6 As shown, the light window base 5 is provided with a liquid inlet channel 5-5 and a liquid outlet channel 5-6 connected to the fluid channel 5-7, and the liquid inlet channel 5-5, the fluid channel 5-7 and the liquid outlet channel 5-6 are connected in sequence, so that the fluid can pass through the three in sequence. The liquid inlet channel 5-5 is also connected to the fluid suction mechanism of the formation testing instrument through a pipeline, so that the fluid sucked by the fluid suction mechanism can enter the liquid inlet channel 5-5; and the liquid outlet channel 5-6 is connected to the liquid storage mechanism through a pipeline, so that the fluid passing through is stored in the liquid storage mechanism or discharged through the liquid storage mechanism.

[0034] like Figure 1 , Figure 2 , Figure 4As shown, the inlet channel 5-5 and the outlet channel 5-6 are arranged to be parallel to the length direction of the instrument body, that is, both are perpendicular to the fluid channel 5-7. In addition, the inlet channel 5-5 is connected to the fluid channel 5-7 through the first cavity 5-14, and the outlet channel 5-6 is connected to the fluid channel 5-7 through the connecting channel. Among them, the inlet channel 5-5 and the outlet channel 5-6 are both extended upward from the bottom surface of the light window base 5, and the mounting base 7 is provided with an inlet hole and an outlet hole connected to the inlet channel 5-5 and the outlet channel 5-6, and the inlet hole and the outlet hole can be connected to pipelines respectively. First, the inlet channel 5-5 extends to the bottom wall of the first cavity 5-14, so that the fluid can flow into the first cavity 5-14 from the inlet channel 5-5, and the outlet channel 5-5 avoids the outlet of the first cavity 5-14 connected to the fluid channel 5-7, so that the fluid is buffered after entering the first cavity 5-14 and can further flow into the fluid channel 5-7 at a stable flow rate. Secondly, the connecting channel is L-shaped, and the connecting channel is also perpendicular to the length direction of the instrument body. The connecting channel and the fluid channel are in the same plane and form a U shape. The connecting channel specifically includes a third channel 5-15 and a fourth channel 5-16. The third channel 5-15 and the fourth channel 5-16 are connected to form an L shape. One end of the third channel 5-15 is connected to the fluid channel 5-7, and the fourth channel 5-16 is connected to the liquid outlet channel 5-6 at the end away from the third channel 5-15. Thus, the fluid can enter the light window base 5 from the liquid inlet channel 5-5, then enter the fluid channel 5-7 through the first cavity 5-14, and then flow into the light window base 5 through the third channel 5-15, the fourth channel 5-16 and the liquid outlet channel 5-6 in sequence. In addition, the light window base 5 is provided with a third cavity 5-3 connected with the third channel 5-15 on the side of the third channel 5-15 facing away from the fourth channel 5-16, and a second sealing plug 6 is provided in the third cavity 5-3; the light window base 5 is provided with a second cavity 5-4 connected with the first cavity 5-14 on the side of the first cavity 5-14 facing away from the fluid channel 5-7, and a first sealing plug 8 is provided in the second cavity 5-4; the third cavity 5-3 and the second cavity 5-4 are both used for later maintenance and standby, and need to be sealed when the light window module is in normal use to prevent the fluid from flowing out.

[0035] Another example Figure 1 and Figure 2As shown, the fluid channel 5-7 is a linear channel with a rectangular cross section. When the formation fluid passes through the light window and enters the fluid channel, the volume does not change, which can prevent the fluid from forming a backflow. The original residual fluid will be completely replaced by the fresh fluid that continuously flows in, so that the light window can accurately measure the spectrum of the fresh fluid that continuously flows in, and improve the accuracy of measuring the properties and characteristic parameters of the formation fluid. Among them, the fluid channel is composed of the upper first channel 5-18 and the second channel 5-17, the second channel 5-17 is arranged on the optical lens assembly, and the first channel 5-18 is divided into a first pipe section and a second pipe section separated by the second channel 5-17. The cross-sectional dimensions of the first pipe section, the second channel 5-17 and the second pipe section are the same. The first pipe section, the second channel 5-17 and the second pipe section are arranged in sequence to form the fluid channel 5-7, so that the entering fluid passes through the first pipe section, the second channel 5-17 and the second pipe section in sequence, and is irradiated by the light source at the second channel 5-17.

[0036] Another example Figure 1 and Figure 3 As shown, the upper end face of the first optical lens 10 abuts against the lower end face of the second optical mirror 9, and the first optical lens 10 is provided with a through groove on the end face facing the second optical lens 9, and the through groove constitutes the above-mentioned second channel 5-17. In order to install the first optical lens 10 and the second optical mirror 9, the light window base 5 is provided with a first mounting cavity 5-19 and a second mounting cavity 5-20 on the lower side and the upper side of the fluid channel 5-7, respectively. The above-mentioned first optical lens 10 is installed in the first mounting cavity 5-19, and the second optical mirror 9 is installed in the second mounting cavity 5-20. In addition, the cavity walls of the first mounting cavity 5-19 and the second mounting cavity 5-20 are provided with a second sealing groove 5-13 and a first sealing groove 5-12, respectively, and sealing rings can be installed to prevent the fluid in the fluid channel 5-7 from flowing out from the first optical lens 10 and the second optical mirror 9. The light window base 5 is provided with a third mounting cavity 5-21 on the side of the first mounting cavity 5-19 facing away from the fluid channel 5-7, and the light source 12 is fixed in the third mounting cavity 5-21 through the light source base 11, and a through hole 5-23 is provided on the mounting base 7 for leading out the lead of the light source 12; the light window base 5 is provided with a fourth mounting cavity 5-22 for fixing the optical fiber 2 on the side of the second mounting cavity 5-20 facing away from the fluid channel 5-7, and the optical fiber 2 is fixed by the optical fiber locking ring 3 and the optical fiber base 4; the optical fiber 2 corresponds to the light source 12, so that the light emitted by the light source 12 can pass through the optical lens assembly and be received by the optical fiber 2, and the irradiation direction of the light source 12 is the direction from the light source 12 to the optical fiber 2.

[0037] When the optical window module is working, the fluid flows into the liquid inlet channel 5-5 through the pipeline, and then flows into the fluid channel 5-7. Water and oil (gas) are separated at the second channel. The light source 12 also irradiates the optical fiber 2, and its light passes through the first optical lens 10, the fluid, and the first optical lens 9 in sequence and is emitted to the optical fiber 2.

[0038] In some exemplary embodiments, Figure 7 and Figure 8 As shown, the formation testing instrument includes many short sections, among which there is a spectral analysis short section, which includes a housing 14, a spectral analysis module 1 and the above-mentioned light window module 15. The spectral analysis module 1 and the light window module 15 are arranged in the housing 14. The length direction of the housing 14 is consistent with the length direction of the above-mentioned instrument body. The two ends of the housing 14 are respectively provided with an upper joint 14-1 and a lower joint 14-2 for quickly connecting other short sections of the instrument. Among them, the first pipeline 16 extends from the upper joint 14-1 to the liquid inlet channel to guide the fluid sucked by the fluid suction mechanism to the light window module 15, and the second pipeline 17 extends from the liquid outlet channel of the light window module 15 to the lower joint 14-2 to guide the fluid flowing out of the light window module 15 to the next short section. The spectral analysis module 1 is a spectral analysis instrument, and one end of the optical fiber 2 on the light window module 15 extends to the spectral analysis module 1 to transmit light.

[0039] Existing spectral analysis usually uses filter array spectroscopy, with a spectral measurement range of 1000-2000nm and only 6 measurement channels. By measuring the transmittance of the fluid at 6 different wavelengths, oil and water are distinguished based on the spectral absorption results in the near-infrared region. The spectral absorption in the range of 1600nm-1800nm ​​can directly reflect the molecular structure of the formation fluid and can quantitatively analyze the components of the formation fluid. Downhole fluid spectral analysis requires a large number of filter channels. In this case, the use of filter arrays cannot be achieved in the downhole environment, especially the need to set a large number of continuous filter channels between 1600nm-1800nm.

[0040] Therefore, the above-mentioned spectrum analysis module 1 includes a formation fluid optical full spectrum scanning analysis instrument based on grating spectroscopy, adopts advanced reflective plane diffraction grating and multi-pixel linear charge coupling technology, and its spectrum receiving measurement range is 900-2100nm, which can fully cover all channels required for formation fluid spectrum analysis, with high integration and good scalability. The spectrum analysis module 1 mainly includes a spectrum scanning probe that can withstand high temperatures underground and occupies a small space, and also includes: an incident slit, a collimating objective lens, a reflective plane diffraction grating, an imaging reflector, a color filter, a reference detection unit, a multi-pixel linear charge coupling device, a data acquisition and processing circuit, etc. The spectrum scanning probe integrates the optical system, core components, and acquisition circuits therein. The optical elements of the spectrum scanning probe are all selected as non-movable components and installed on precision-machined firmware, which improves its shock resistance. In addition, the light window module 15 is connected to the spectrum analysis module 1 by a pressure-bearing optical fiber connector to prevent the underground fluid that may invade the light window module 15 from entering the spectrum analysis module 1 and damaging the circuit and spectrum analysis components.

[0041] In some exemplary embodiments, Figure 7 As shown, the housing 14 is divided into a light window section 14-3 and an analysis section 14-4, which are detachably connected to achieve rapid disassembly and pipeline docking, and the light window module 15 is fixed in the light window 14-3, and the spectrum analysis module 1 is fixed in the analysis section 14-4, so that the two modules can be quickly separated and installed, which is conducive to later maintenance. The analysis section 14-4 has a built-in thermos bottle, and the circuit and spectrum scanning probe are placed in the thermos bottle to protect the circuit and optical probe. In addition, the spectrum analysis module 1 is electrically connected to the controller of the formation testing instrument, and data can be transmitted to the controller. The above-mentioned light source 12 is also electrically connected to the controller to control the opening and closing of the light source 12.

[0042] In some exemplary embodiments, a third pipeline 18 is further provided in the housing 14, and the two ends of the third pipeline 18 are respectively connected to the first pipeline 16 and the second pipeline 17 to form two flow lines, namely, a first branch that passes through the first pipeline 16, the light window module 15, and the second pipeline 17 in sequence, and another second branch that passes through the first pipeline 16, the third pipeline 18, and the second pipeline 17 in sequence. The fluid flowing through the first branch needs to pass through the light window module 15, while the fluid flowing through the second branch does not flow through the light window module 15. A two-way hydraulic control valve 19 is provided on the third pipeline 18 to control the closing of the second branch; a two-way hydraulic control valve 19 is also provided on the first pipeline 16, and the two-way hydraulic control valve 19 is located between the junction of the first pipeline 16 and the third pipeline 18 and the light window module 15 to control the closing of the first branch. Both two-way hydraulic control valves 19 are electrically connected to the controller to control the opening and closing of the two-way hydraulic control valves 19 in real time.

[0043] When formation fluid analysis is required, the two-way hydraulic control valve 19 on the first pipeline 16 can be opened, and the two-way hydraulic control valve 19 on the third pipeline 18 can be closed at the same time, and the formation fluid will flow into the light window module, and then the ground controller will command to open the light source 12, and the composite light emitted by the light source 12 will be transmitted through the optical window of the downhole fluid of the light window module to become a signal light, and then the optical fiber 2 will transmit the light and focus it into the optical system of the spectrum scanning probe; the signal light is diffracted and split by the concave grating to form monochromatic light with different wavelengths; the monochromatic light is received by the CCD linear detection array at the back end, and the optical signal is converted into an electrical signal; the acquisition circuit collects, processes and transmits the electrical signal to the data processing system. The data processing system completes the reconstruction of the spectral information of the predetermined wavelength range, and obtains the real-time spectral image of the downhole fluid, which is the spectral data. When real-time analysis is not required, the light source 12 can be turned off, and the two-way hydraulic control valve 19 on the first pipeline 16 can be closed, and the two-way hydraulic control valve 19 on the third pipeline 18 can be opened at the same time to cut off the formation fluid entering the light window module.

[0044] In combination with the above-mentioned embodiments, the optical window module of the embodiment of the present disclosure adjusts the fluid flow direction according to the instrument body, that is, perpendicular to the length direction of the instrument body. When the fluid flows through the optical lens assembly, gravity can be used to separate water and oil (gas), so as to prevent water from affecting the oil (gas) spectrum measurement and improve the accuracy of oil (gas) spectrum measurement. The optical window module of the embodiment of the present disclosure adopts a straight and rectangular fluid channel. When the formation fluid enters the fluid channel through the optical window, the volume will not change, so as to prevent the fluid from forming a backflow. The original residual fluid will be completely replaced by the fresh fluid that continuously flows in, so that the optical window can accurately measure the spectrum of the fresh fluid that continuously flows in, and improve the accuracy of measuring the properties and characteristic parameters of the formation fluid. The optical window module of the embodiment of the present disclosure is mainly composed of an optical window base, an optical window mounting base, an optical fiber, an optical fiber base, an optical lens assembly, a light source, etc. It is simple and practical and easy to disassemble and assemble.

[0045] In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "relative", "four corners", "periphery", "'mouth'-shaped structure" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", and "fixed connection" can be a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] Although the implementation methods disclosed in the utility model are as above, the above contents are only implementation methods adopted to facilitate the understanding of the utility model, and are not used to limit the utility model. Any technician in the field to which the utility model belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the utility model, but the scope of patent protection of the utility model shall still be defined by the attached claims.

Claims

1. A light window module of a formation testing instrument, arranged in an instrument body, comprising a light window base, a light-transmitting optical lens assembly is fixed in the light window base, a light source and an optical fiber are respectively fixed on both sides of the optical lens assembly, the optical lens assembly comprises a first optical lens and a second optical lens, characterized in that: The optical window base is provided with a fluid channel between the first optical lens and the second optical lens, and the fluid channel is arranged to extend in a straight line and perpendicular to the length direction of the instrument body.

2. The light window module of the formation testing instrument according to claim 1, characterized in that: The fluid channel is configured to have a rectangular cross section, a first channel is provided on the light window base, and a second channel is provided on the optical lens assembly. The first channel is connected to the second channel to form the fluid channel.

3. The light window module of the formation testing instrument according to claim 2, characterized in that: The first optical lens is provided with a through groove on the end face facing the second optical lens, and the first optical lens and the second optical lens abut against each other to form the second channel.

4. The light window module of the formation testing instrument according to claim 2, characterized in that: The first channel includes a first pipe segment and a second pipe segment spaced apart from each other. The first pipe segment, the second channel and the second pipe segment are arranged in sequence to form the fluid channel.

5. The light window module of the formation testing instrument according to claim 3, characterized in that: The light window base is provided with a liquid inlet channel, a first cavity and a liquid outlet channel. One end of the fluid channel and one end of the liquid inlet channel are respectively connected to the first cavity, and the other end of the fluid channel is connected to the liquid outlet channel.

6. The light window module of the formation testing instrument according to claim 5, characterized in that: The light window base is provided with a first mounting cavity and a second mounting cavity on both sides of the fluid channel for mounting the first optical lens and the second optical lens respectively; the light window base is provided with a third mounting cavity for fixing the light source on the side of the first mounting cavity facing away from the fluid channel, and the light window base is provided with a fourth mounting cavity for fixing the optical fiber on the side of the second mounting cavity facing away from the fluid channel.

7. The light window module of the formation testing instrument according to claim 5, characterized in that: The light window base is provided with a connecting channel, which is arranged to be perpendicular to the length direction of the instrument body, and the liquid inlet channel and the liquid outlet channel are arranged to be parallel to the length direction of the instrument body. The two ends of the connecting channel are respectively connected to the fluid channel and the liquid outlet channel, and the connecting channel and the fluid channel form a U-shape.

8. The light window module of the formation testing instrument according to claim 7, characterized in that: The light window base is provided with a second cavity connected with the first cavity on a side of the first cavity facing away from the fluid channel, and a first sealing plug is provided in the second cavity; The connecting channel includes a third channel and a fourth channel connected to each other, the third channel and the fourth channel form an L-shape, the third channel is connected to the fluid channel, and the light window base is provided with a third cavity connected to the third channel on the side of the third channel facing away from the fluid channel, and a second sealing plug is provided in the third cavity.

9. The light window module of the formation testing instrument according to claim 6, characterized in that: A sealing ring is arranged between the first optical lens and the first mounting cavity, and between the second optical lens and the second mounting cavity.

10. The light window module of the formation testing instrument according to claim 5, characterized in that: It comprises a mounting base, the mounting base is fixed in the instrument body, the light window base is detachably mounted on the mounting base, and the mounting base is provided with a liquid inlet hole and a liquid outlet hole which are connected with the liquid inlet channel and the liquid outlet channel.

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