CN219262347U - While-drilling detection device for downhole gas - Google Patents

Abstract

The utility model provides a detection while drilling device for downhole gas, which comprises a first nipple; the control mechanism is arranged in the first short section; the detection mechanism is arranged between the first short joint and the control mechanism and comprises a separation bin for receiving underground gas, a detection bin and an adjusting component; and the second nipple is internally provided with a gas injection mechanism which is communicated with the separation bin and used for injecting carrier gas, wherein the control mechanism is connected with the adjusting component so as to promote underground gas and carrier gas to flow into the separation bin and the detection bin in sequence through the adjusting component, and the underground condition is evaluated through a detection device in the detection bin. The utility model can detect the complex gas in the well in real time, thereby ensuring that ground personnel can grasp the information of the oil gas in the stratum in the well in real time, and further accurately judging the property and the productivity of the reservoir.

Description

Detection-while-drilling device for downhole gas

technical field

The utility model relates to the fields of petroleum geological exploration drilling and safe production, in particular to a gas detection device while drilling in a downhole.

Background technique

In the process of drilling, gas kick phenomenon is a very high risk phenomenon. Especially in the downhole with complex situation, a little carelessness will cause serious accidents such as well kick or even blowout. For example, in the "three high" wells with high pressure, high production and high hydrogen sulfide content or wells whose formation properties are poorly understood.

The traditional air intrusion detection is mainly judged by the liquid level of the mud pool on the ground or by the change of the outlet flow. However, the above two methods are easily interfered by external factors, thus affecting the accuracy of discrimination. In addition, both of the above two methods have information lag, which can easily have a greater impact on later exhaust and downhole safety.

If the oil and gas information of the downhole formation can be obtained, it will be beneficial to judge the nature and productivity of the reservoir. At present, most of the hydrocarbon logging technology needs to remove the hydrocarbons in the drilling fluid on the surface, and then use chromatography, fluorescence, infrared spectroscopy and other means to detect and evaluate to obtain downhole information. However, this technology is expensive and oil and gas evaluation Unquantified, slow analysis speed and other issues.

CN209413900U discloses a kind of downhole gas-liquid separation detection device while drilling, it comprises separation cylinder, laser Raman detection device, separation cylinder opening end face place is fixedly provided with solid-liquid separation membrane, in separation cylinder, gas-liquid separation membrane, piston are arranged successively , Partition wall, one end of the inner and outer double screw located on the outer side of the partition is vertically connected to the piston, and the part of the inner and outer double screw located on the inner side of the partition is provided with a second ball return device; one end of the inner screw is vertically installed with a gas-liquid separation membrane, and the inner screw It meshes with the inner and outer double screw, and the other end of the inner screw is provided with a first ball return device; both ends of the two ball return devices have shaft shoulders, and the middle section has gear teeth, and each ball return device is connected to the corresponding The gears are meshed, and each gear is installed at the power output end of the corresponding motor; the laser Raman detection device includes a laser Raman detector and a laser Raman probe, and the laser Raman detector is connected to the laser Raman probe.

The above-mentioned device can obtain downhole information in wells with known formation properties. Due to the small and uncertain space in the drill string of "three high" wells or wells with less known formation characteristics, and the laser Raman detector is usually large in volume, it is difficult to perform the test in the drill string with small space. for effective installation. In addition, since laser Raman detection is a precision instrument, it is even more difficult to ensure the accuracy of downhole information under the condition of drill string vibration or high temperature downhole.

Therefore, it is desirable in the art to provide a detection-while-drilling device for downhole gas so as to solve the above-mentioned problems.

Utility model content

The purpose of this utility model is to propose a detection device for downhole gas while drilling, which can detect the composition and concentration of downhole complex gas more accurately through the gas sensor array, so that the ground personnel can grasp the downhole gas in real time. The formation oil and gas information, and then can accurately judge the nature and production capacity of the reservoir.

According to the first aspect of the present utility model, a detection-while-drilling device for downhole gas is provided, including a first short joint;

a control mechanism disposed within said first short section;

The detection mechanism arranged between the first short joint and the control mechanism includes a separation chamber for receiving downhole gas, a detection chamber arranged upstream of the separation chamber, and a detection chamber arranged between the separation chamber and the control mechanism. an adjustment assembly between the detection chambers; and

a second short joint arranged downstream of the first short joint, a gas injection mechanism for injecting carrier gas communicated with the separation chamber is arranged in the second short joint,

Wherein, the control mechanism is connected with the adjustment assembly, so as to promote the downhole gas and the carrier gas to flow into the separation chamber and the detection chamber sequentially through the adjustment assembly, so as to pass through the detection chamber The internal detection device is used to evaluate the downhole situation.

In one embodiment, the detection-while-drilling device includes a V-shaped diversion groove arranged in the outer wall of the first nipple, and a solid filter arranged on the V-shaped diversion groove, wherein, The V-shaped guide groove includes an inlet on the radially outer side, a first outlet on the radially inner side, and a second outlet on the radially outer side and axially upstream of the inlet, and the V-shaped guide groove configured to receive downhole fluid through the inlet and the solids filter.

In one embodiment, the adjustment assembly includes a piston member communicating with the separation chamber, and a first one-way valve arranged upstream of the piston member and communicating with the detection chamber,

Wherein, the control mechanism is configured to enable the downhole gas in the V-shaped diversion groove and the carrier gas in the gas injection mechanism to flow into the separation chamber and mix by controlling the piston, and The mixed gas is urged to flow into the detection chamber by controlling the first one-way valve.

In one embodiment, the separation chamber includes at least one through hole, and a gas-liquid separation membrane arranged in the through hole, wherein the gas-liquid separation membrane is located in the V-shaped guide groove in the axial direction. within the range of the first outlet of the V-shaped diversion groove, so that the downhole fluid flowing through the V-shaped diversion groove is separated and the separated gas is allowed to enter the separation chamber, while the separated liquid passes through the V-shaped diversion groove The second outlet and the solid filter return downhole.

In one embodiment, the detection device includes a gas sensor array composed of several metal semiconductor thin slices arranged circumferentially in the detection chamber.

In one embodiment, the gas injection mechanism includes a cylinder communicating with the separation chamber, a flow controller disposed at the outlet end of the cylinder, and a sealing connector for connecting with the downstream end of the separation chamber, Wherein, the control mechanism communicates with the flow controller.

In one embodiment, the gas injection mechanism further includes a second one-way valve disposed at the outlet end of the cylinder, so as to allow the gas in the cylinder to flow to the separation chamber.

In one embodiment, the detection-while-drilling device further includes several roller-type stabilizing blocks arranged circumferentially in the annular space between the second pup joint and the gas injection mechanism, and the gas injection mechanism The mechanism is configured to be able to maintain a fixed posture under the action of the roller type righting block.

In one embodiment, the control mechanism includes a circuit module connected to the adjustment assembly and the gas injection mechanism, a storage module connected to the gas sensor array and recording the detection results in real time, and connected to the upstream MWD A connected interface module, wherein the interface module is configured to perform signal compilation on the data in the storage module and transmit it to the MWD in real time.

Compared with the prior art, the utility model has the advantages that: the utility model utilizes the gas sensor array to have good anti-high-temperature and high-pressure-resistant capabilities in the downhole, and can check the composition and concentration of complex mixed gases. The ability to perform more accurate detection ensures the accuracy and authority of the detection results, and enables ground personnel to grasp the information of oil and gas in the downhole formation in real time, so as to accurately judge the nature and productivity of the reservoir. In addition, since the gas sensor array in the utility model has high sensitivity downhole and the overall volume is small, it can be lowered into the well following the drilling tool. Therefore, when in a "three-high" well or a well with less known formation characteristics, the utility model can still be more easily adapted to situations where the space in the drill string is small and uncertain.

Description of drawings

The utility model will be described in detail below in conjunction with accompanying drawing, in the figure:

Fig. 1 is a schematic structural view of the first part of the detection-while-drilling device for downhole gas according to the utility model;

Fig. 2 is a structural schematic diagram of the second part of the detection-while-drilling device for downhole gas according to the utility model;

Fig. 3 shows the structure of the detection-while-drilling device for downhole gas according to the utility model.

In the figures, the same parts are given the same reference numerals. The figures are not drawn to scale.

Detailed ways

In order to make the technical solutions and advantages of the present utility model clearer, the exemplary embodiments of the present utility model will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only part of the embodiments of the present invention, rather than exhaustive of all the embodiments. And in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

For ease of understanding, the directional term "longitudinal" or "axial" or similar term refers to the length direction of the MWD device for downhole gas, ie the vertical direction in FIG. 1 . The directional terms "transverse" or "radial" or similar terms refer to a direction perpendicular to "longitudinal" or "axial", ie the horizontal direction in FIG. 1 .

The directional terms "upstream" or "above" or similar terms refer to the direction near the wellhead, ie the top direction in Figure 1 . The directional terms "downstream" or "below" or similar terms refer to the direction away from the wellhead, ie the bottom direction in FIG. 1 .

Fig. 1 is a schematic structural view of a first part of a detection-while-drilling device 100 for downhole gas according to the present invention. Fig. 2 is a schematic structural diagram of the second part of the detection-while-drilling device 100 for downhole gas according to the present invention. Fig. 3 shows the structure of the detection-while-drilling device for downhole gas according to the utility model

As shown in FIGS. 1 to 3 , a detection-while-drilling device 100 for downhole gas according to the present utility model mainly includes a first short joint 1 and a second short joint 2 . Wherein, the upstream end of the first short joint 1 is connected with MWD (Measurement While Drilling Instrument), so that the detected information can be transmitted to the ground in real time through MWD. The downstream end of the second sub-joint 2 is fixedly connected with the downhole dynamic drilling tool, so that the detection-while-drilling device 100 can enter the well together with the drilling tool for detection work.

According to the present utility model, as shown in FIG. 1 , the detection-while-drilling device 100 further includes a control mechanism 2 and a detection mechanism 3 . Wherein, the control mechanism 2 is arranged in the first short joint 1 , and the detection mechanism 3 is arranged between the control mechanism 2 and the first short joint 1 . Preferably, the control mechanism 2 and the detection mechanism 3 are in a split layout, so that both the control mechanism 2 and the detection mechanism 3 have relatively independent working environments, thereby improving the working efficiency of the detection-while-drilling device 100 and the accuracy of detection information. Its content is described below.

In one embodiment, the first short joint 1 is used as a supporting framework of the control mechanism 2 and the detection mechanism 3, so as to provide a stable and safe working environment for both of them downhole.

According to the present utility model, as shown in FIG. 1 , the detection mechanism 3 includes a separation chamber 32 and a detection chamber 31 . Wherein, the separation chamber 32 communicates with the inside of the well (not shown) through the V-shaped diversion groove 11, so as to be able to receive downhole gas. The detection chamber 31 is provided upstream of the separation chamber 32, and the detection chamber 31 communicates with the outside through a valve (not shown), so that the detected gas can be discharged. It is easy to understand that the downhole in the utility model refers to the annular space between the drill string and the well; the downhole gas refers to the gas in the annular space between the drill string and the well; the downhole fluid refers to the drill string and the well. fluid in the annulus between.

In one embodiment, both the detection chamber 31 and the separation chamber 32 are fixed in the first short joint 1 through threaded connection, therefore, they can always follow the rotation of the first short joint 1 during the drilling process, thereby having a stable working environment.

According to the present invention, as shown in FIG. 1 , the detection mechanism 3 further includes an adjustment component 33 . The adjustment assembly 33 is arranged between the separation chamber 32 and the detection chamber 31 , so that the separation chamber 32 can be selectively communicated with the detection chamber 31 . In addition, the control mechanism 2 communicates with the adjustment assembly 33 and can control the opening and closing of the adjustment assembly 33 . Its content is described below.

In one embodiment, as shown in FIG. 2 , an air injection mechanism 41 is provided in the second short joint 2 . The gas injection mechanism 41 communicates with the separation chamber 32, and can inject carrier gas into the separation chamber 32, thereby improving the accuracy of the gas detection results in the well.

In one embodiment, the second short joint 2 serves as a supporting frame of the gas injection mechanism 41, thereby providing a stable and safe working environment for it.

According to an embodiment of the present utility model, the control mechanism 2 is configured to be able to promote the downhole gas and the carrier gas in the gas injection mechanism 41 to flow into the separation chamber 32 and the detection chamber 31 sequentially through the adjustment assembly 33, thereby passing through the detection chamber 31 The detection device is used to evaluate the downhole situation. Its content is described below.

According to the present invention, as shown in FIG. 1 , the adjustment assembly 33 includes a piston member 331 . Wherein, the piston member 311 communicates with the upstream end of the separation chamber 32 . Therefore, when the control mechanism 2 controls the piston member 311 to work, it can promote the environment of negative pressure in the separation chamber 32 (that is, the pressure in the separation chamber 32 gradually decreases), so that the V-shaped guide groove 11 (described below) ) and the carrier gas in the gas injection mechanism 41 enter the separation chamber 32 under the action of the pressure difference, and the two can be fully mixed, which further improves the accuracy of the downhole gas detection results.

In a specific embodiment, under the initial state, the pressure of the separation chamber 32 is balanced with the pressure in the drilling tool, and only when the piston member 331 is working, the pressure difference between the inside and outside of the drill string will be generated (that is, the pressure in the separation chamber 32 will gradually decrease. ), so as to guide the downhole gas in the V-shaped diversion groove 11 and the carrier gas in the gas injection mechanism 41 to the separation chamber 32 at the same time, so as to ensure the accuracy and authority of the subsequent detection results.

According to the present invention, as shown in FIG. 1 , the adjustment assembly 33 further includes a first one-way valve 332 . The first one-way valve 332 is disposed upstream of the piston member 331 and communicates with the downstream end of the detection chamber 31 . Therefore, when the control mechanism 2 controls the first one-way valve 332 to work, the mixed gas in the separation chamber 32 (the above-mentioned downhole gas and the carrier gas in the gas injection mechanism 41 ) can flow into the detection chamber 31 . At that time, the downhole gas can be quickly detected through the detection device in the detection chamber 31, and the detection result can be transmitted to the ground in real time through the MWD.

In addition, the first one-way valve 332 has the function of one-way delivery, so the mixed gas in the separation chamber 32 can only flow into the detection chamber 31 . In this way, the possibility of backflow is avoided, thereby improving the accuracy and authority of the detection results of the detection-while-drilling device 100 .

In a preferred embodiment, the detection device is a gas sensor array 311 . The gas sensor array 311 includes several metal-semiconductor flakes arranged in the detection chamber 31 along the circumference, and each metal-semiconductor flake is in the shape of a rectangle.

It is easy to understand that because the gas sensor has good selectivity, in other words, each sensor is only sensitive to one or several gases. The formation gas and natural gas in the gas in the well are both mixed gases. Therefore, the utility model arranges several metal semiconductor sheets in the detection chamber 31 in an array, so that the composition and concentration of the gas in the well can be more accurately measured. Detection, so as to ensure the accuracy and authority of the detection results, and effectively avoid downhole misjudgment caused by incorrect detection results.

Compared with precision instruments such as laser Raman detection in the prior art, the gas sensor array 311 used in the utility model has good resistance to high temperature and high pressure, and can be used in the face of complex mixed gases More accurate detection of its components and concentrations, so as to ensure the accuracy and authority of the test results. Therefore, the oil-gas-bearing information of downhole formations can be grasped in real time through the detection-while-drilling device 100 , so that the properties and productivity of the reservoir can be accurately judged.

In addition, the gas sensor array 311 in the utility model has good sensitivity and small volume (for example, the application can be directly connected with the drilling tool and lowered into the well), so it can be more easily It can be adapted to "three-high" wells or wells with little known formation characteristics, so as to accurately judge the properties and productivity of such downhole reservoirs.

According to the present utility model, as shown in FIG. 1 , the detection-while-drilling device 100 further includes a V-shaped diversion groove 11 and a solid filter (not shown). The V-shaped diversion groove 11 is arranged in the outer wall of the first short joint 1 , and is used to guide the fluid in the annulus of the drill string and the well to flow to the separation chamber 32 . The solid filter is arranged on the V-shaped diversion groove 11, so that the solid in the annular space can be filtered. It is easy to understand that when working downhole, the well contains multi-phase flows such as cuttings, water, oil and gas, so the solid phase substances such as solid cuttings must be completely filtered out first, otherwise the subsequent gas separation membrane (introduced below) is easily washed away. bad and invalid.

According to an embodiment of the present invention, as shown in FIG. 1 , the V-shaped diversion groove 11 includes an inlet 111 , a first outlet 112 and a second outlet 113 . Wherein, the inlet 111 is located on the outside in the radial direction, and is used for receiving downhole fluid. The first outlet 112 is radially inward, communicates with the gas-liquid separation membrane 322 , and is used for delivering the separated gas to the separation chamber 32 . The second outlet 113 is radially outside and axially upstream of the inlet 111 , and discharges the separated liquid under the action of the flow pressure difference.

According to one embodiment of the present invention, since the fluid in the annulus between the drill string and the well moves upstream, the fluid in the annulus enters into the In the V-shaped diversion groove 11. The separation chamber 32 is configured to form a negative pressure environment under the action of the piston member 331, thereby promoting the fluid in the V-shaped diversion groove 11 to send the separated gas into the separation chamber through the first outlet 112 and the gas-liquid separation membrane 322 32, and the separated liquid flows back to the annulus through the second outlet 113 and the solid filter. In this way, on the one hand, the solid phase substances in the substances in the well are filtered out under the action of the solid filter, so that only the downhole fluid is allowed to enter into the V-shaped diversion groove 11 . On the other hand, the liquid in the downhole fluid is filtered out under the action of the gas-liquid separation membrane 322 , so that only the downhole gas is allowed to enter the separation chamber 32 . Therefore, the detection-while-drilling device 100 can ensure that all gas enters the separation chamber 32, thereby ensuring the accuracy of subsequent detection results.

In another embodiment, the detection-while-drilling device 100 further includes a cover plate 12 . The solid filter is installed on the inner wall of the cover plate 12, and the cover plate 12 is configured to partially extend into the inlet 111 and the second outlet 113 of the V-shaped flow guide groove 11 to form a fixed connection, so that the solid filter and the V Type diversion groove 11 plays an effective protective role.

In one embodiment, as shown in FIG. 1 , the separation chamber 32 includes at least one through hole and a gas-liquid separation membrane 322 . The through hole is aligned with the first outlet 112 of the V-shaped guide groove 11 , so that the fluid in the V-shaped guide groove 11 is allowed to enter through the first outlet 112 . The gas-liquid separation membrane 322 is disposed in the through hole, so as to separate the fluid in the V-shaped diversion groove 11 . Its content is described below.

According to an embodiment of the present invention, the separation chamber 32 is configured to form a negative pressure environment under the action of the piston member 331 , so as to promote the downhole fluid in the V-shaped diversion groove 11 to enter the separation chamber 32 . In this way, the downhole fluid is separated under the action of the gas-liquid separation membrane 322, and the separated gas enters the separation chamber 32, and the separated liquid flows back to the annulus.

In one embodiment, the gas-liquid separation membrane 322 is located within the range of the first outlet 112 of the V-shaped guide groove 11 in the axial direction. As a result, the downhole fluid in the V-shaped diversion groove 11 can fully enter the separation chamber 32 through the gas-liquid separation membrane 322, thereby ensuring that only gas enters the separation chamber 32, thereby improving the detection results of the detection-while-drilling device 100 accuracy.

In one embodiment of the present invention, both the gas-liquid separation membrane 322 and the solid filter have good resistance to high temperature, high pressure and impact. At the same time, the gas-liquid separation membrane 322 and the solid filter can also be effectively protected by the first short joint 1. Therefore, compared with the prior art, the utility model has good downhole safety measures, so that it can obtain more accurate Test results.

In one embodiment, as shown in FIG. 2 , the air injection mechanism 41 includes an air cylinder 411 installed in the second short joint 2 . Preferably, the cylinder 411 is a high-pressure cylinder, so that a sufficient amount of compressed air can be charged (generally, 500h of air supply can be guaranteed). In addition, the air in the cylinder 411 can be inspected and replenished after each trip out to perform the next long-term gas detection downhole.

In one embodiment, as shown in FIG. 2 , the gas injection mechanism 41 further includes a flow controller 412 . Wherein, the flow controller 412 is arranged at the outlet end of the cylinder 411 , and can control the flow rate of the gas flowing into the separation chamber 32 from the cylinder 411 . In addition, the flow controller 412 is connected to the control mechanism 2 . Therefore, when the piston member 311 is working, the control mechanism 2 can adjust the flow rate of the gas flowing from the cylinder 411 to the separation chamber 32 by controlling the flow controller 412, further improving the stability of the gas flow rate and the mixing of the carrier gas and the downhole gas. sufficiency.

In one embodiment, as shown in FIG. 2 , the gas injection mechanism 41 further includes a sealing connector 413 disposed in the second short joint 2 . The upstream end of the sealing connector 413 can be butted in a sealed manner with the downstream end of the separation chamber 32 , so as to ensure that the air cylinder 411 can fully and safely flow into the separation chamber 32 .

In one embodiment of the present invention, the gas injection mechanism 41 further includes a second one-way valve (not shown). The second one-way valve is installed at the outlet end of the cylinder 411, so that the gas flow direction of the gas injection mechanism 41 can only be from the cylinder 411 to the separation chamber 32, thereby effectively avoiding the problem of affecting the accuracy of the detection results due to reverse flow .

According to an embodiment of the present invention, as shown in FIG. 2 , the detection-while-drilling device 100 further includes a roller-type centralizing block 42 . There are several roller-type centralizing blocks 42, and they are all arranged in the annular space between the second short joint 4 and the gas injection mechanism 41 along the circumferential direction. Therefore, during downhole drilling, the gas injection mechanism 41 can always maintain a fixed posture, and will not follow the rotation of the second short joint 2, thereby effectively improving the safety of the cylinder 411 and the stability of the output carrier gas.

In addition, because the gas injection mechanism 41 can always be in a fixed posture, it can provide good support for the control mechanism 2 and the detection mechanism 3 upstream of the gas injection mechanism 41, so as to ensure the stability of the detection chamber 31 and the separation chamber 32. working environment.

In one embodiment, as shown in FIG. 1 , the control mechanism 2 includes a circuit module 21 . The circuit module 21 communicates with the adjustment assembly 33 and the gas injection mechanism 41 respectively, so that the two can be controlled more precisely, so that the gas injection mechanism 41 can send air to the separation chamber 32 according to the working state of the piston member 331 in the adjustment assembly 33 . Delivery of carrier gas.

In one embodiment, as shown in FIG. 1 , the control mechanism 2 further includes a storage module 22 . The storage module 22 communicates with the gas sensor array 311 and can record the detection results presented by the gas sensor array 311 in real time.

In one embodiment, as shown in FIG. 1 , the control mechanism 2 further includes an interface module 23 . The first end of the interface module 23 is directly connected to the upstream MWD, and the second end of the interface module 23 is connected to the storage module 22, so that the detection result information in the storage module 22 can be transmitted to the ground in real time through the MWD to improve information acquisition. accuracy and effectiveness.

In one embodiment, as shown in FIG. 1 , the control mechanism 2 further includes a power adjustment module (not shown). The electric energy adjustment module includes a first battery pack 241 that supplies power to the storage module 22 alone, a second battery pack 242 that supplies power to the detection-while-drilling device 100 as a whole, and an adjustment member. Wherein, the regulating member can reasonably distribute electric energy, so as to intelligently adjust the power supply relationship between the first battery pack 241 and the second battery pack 242 .

According to the second aspect of the present utility model, a method for detecting downhole gas using the above-mentioned detection-while-drilling device 100 for downhole gas is proposed, including the following steps.

First, the control mechanism 2 and the detection mechanism 3 are installed in the first short joint 1 through threads, and the position of the separation chamber 32 is adjusted so that the through hole is radially aligned with the first outlet 111 .

Then, the gas injection mechanism 41 is installed into the second sub-joint 2 through the roller-type centering block 42 , and is sealingly connected with the downstream end of the separation chamber 32 through the sealing connector 413 .

Afterwards, the upstream end of the assembled detection-while-drilling device 100 is connected to the MWD, and the downstream end is connected to the downhole power drilling tool and put into the downhole.

Afterwards, the downhole gas and the carrier gas in the gas injection mechanism 41 are urged to flow into the separation chamber 32 and the detection chamber 31 sequentially by adjusting the assembly 33,

Specifically, the fluid in the annular space enters into the V-shaped diversion groove 11 through the inlet 111 and the solid filter under the action of the flow pressure difference; the control mechanism 2 controls the operation of the piston 331, thereby promoting the generation of negative pressure in the separation chamber 32 environment (that is, the pressure in the separation chamber 32 gradually decreases). Thus, the downhole gas in the V-shaped diversion groove 11 enters the separation chamber 32 through the gas-liquid separation membrane 322, and the carrier gas in the gas injection mechanism 41 enters the separation compartment 32 through the flow controller 412 and the second one-way valve. Bin 32. At this time, the downhole gas and the carrier gas are fully mixed in the separation chamber 32;

Specifically, the control mechanism 2 controls the first one-way valve 332 to open, so that the mixed gas in the separation chamber 32 enters the detection chamber 31 . At this time, the piston member 331 is reset.

Afterwards, the downhole gas is fully detected through the gas sensor array 311 in the detection chamber 31 , and the detected data is stored in the storage module 22 .

Finally, the detection data in the storage module 22 is compiled and transmitted to the MWD in real time through the interface module 23, and then transmitted to the ground through the MWD, so that the downhole situation can be judged in real time.

It is easy to understand that after each detection work, the detection chamber 31 needs to discharge the mixed gas inside, so as to repeat the above operation to perform a new round of downhole gas detection.

The utility model provides a detection device for downhole gas while drilling, which utilizes the gas sensor array to have good resistance to high temperature and high pressure in the downhole and can detect the components and The ability to conduct more accurate detection of the concentration, so as to ensure the accuracy and authority of the detection results, and enable ground personnel to grasp the information of oil and gas in the downhole formation in real time, so as to accurately judge the nature and productivity of the reservoir. In addition, since the gas sensor array in the utility model has high sensitivity downhole and the overall volume is small, it can be lowered into the well following the drilling tool. Therefore, when in a "three-high" well or a well with less known formation characteristics, the utility model can still be more easily adapted to situations where the space in the drill string is small and uncertain.

The above are only preferred embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art can easily make changes or changes within the disclosed scope of the utility model, and such changes or changes should be covered within the protection scope of the utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (9)

1. A while-drilling detection device for downhole gas, comprising:

a first nipple (1);

a control mechanism (2) arranged in the first short section (1);

a detection mechanism (3) arranged between the first nipple (1) and the control mechanism (2), comprising a separation bin (32) for receiving downhole gas, a detection bin (31) arranged upstream of the separation bin (32), and an adjustment assembly (33) arranged between the separation bin (32) and the detection bin (31); and

a second nipple (4) arranged at the downstream of the first nipple (1), a gas injection mechanism (41) communicated with the separation bin (32) and used for injecting carrier gas is arranged in the second nipple (4),

the control mechanism (2) is connected with the adjusting assembly (33) so as to enable the underground gas and the carrier gas to flow into the separation bin (32) and the detection bin (31) in sequence through the adjusting assembly (33), and therefore the underground condition is evaluated through detection devices in the detection bin (31).

2. A detection apparatus while drilling for downhole gas according to claim 1, comprising a V-shaped channel (11) arranged in an outer wall inside the first sub (1), and a solid filter arranged on the V-shaped channel (11), wherein the V-shaped channel (11) comprises an inlet (111) radially outside, a first outlet (112) radially inside, and a second outlet (113) radially outside and axially upstream of the inlet (111), and is configured to be able to receive downhole fluid through the inlet (111) and the solid filter.

3. The while-drilling detection device for downhole gases according to claim 2, wherein the adjustment assembly (33) comprises a piston member (331) in communication with the separation chamber (32), and a first one-way valve (332) arranged upstream of the piston member (331) and in communication with the detection chamber (31),

wherein the control mechanism (2) is configured to cause the downhole gas in the V-shaped diversion trench (11) and the carrier gas in the gas injection mechanism (41) to flow into the separation bin (32) and mix by controlling the piston member (331), and to cause the mixed gas to flow into the detection bin (31) by controlling the first one-way valve (332).

4. A downhole gas while drilling detection device according to claim 3, wherein the separation bin (32) comprises at least one through hole, and a gas-liquid separation membrane (322) arranged in the through hole, wherein the gas-liquid separation membrane (322) is axially in the range of the first outlet (112) of the V-shaped channel (11), thereby separating the downhole fluid flowing through the V-shaped channel (11) and allowing the separated gas to enter the separation bin (32), while the separated liquid is returned downhole through the second outlet (113) of the V-shaped channel (11) and the solid filter.

5. A downhole gas while drilling detection apparatus according to claim 4, wherein the detection means comprises a gas sensor array (311) consisting of a number of metal semiconductor wafers circumferentially arranged within the detection chamber (31).

6. The while-drilling detection device for downhole gas according to claim 5, wherein the gas injection mechanism (41) comprises a cylinder (411) in communication with the separation chamber (32), a flow controller (412) arranged at an outlet end of the cylinder (411), and a sealing connector (413) for connection with a downstream end of the separation chamber (32), wherein the control mechanism (2) is in communication with the flow controller (412).

7. The while drilling detection apparatus for downhole gases according to claim 6, wherein the gas injection mechanism (41) further comprises a second one-way valve arranged at the outlet end of the cylinder (411) allowing the gas within the cylinder (411) to flow towards the separation bin (32).

8. The while-drilling detection device for downhole gas according to claim 7, further comprising a number of roller-type centralizers (42) circumferentially arranged in the annulus between the second sub (4) and the gas injection mechanism (41), the gas injection mechanism (41) being configured to be able to maintain a fixed attitude under the influence of the roller-type centralizers (42).

9. A downhole gas while drilling detection device according to claim 8, wherein the control mechanism (2) comprises a circuit module (21) connected to the conditioning assembly (33) and the gas injection mechanism (41), respectively, a memory module (22) in communication with the gas sensor array (311) and recording the detection results in real time, and an interface module (23) in communication with the upstream MWD, wherein the interface module (23) is configured to signal the data within the memory module (22) and transmit to the MWD (5) in real time.

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