Weighing device and monitoring method for monitoring gas intrusion into watertight pipe

Abstract

The present invention is a weighing device and a monitoring method for monitoring gas intrusion into a watertight pipe. The weighing device for monitoring gas intrusion into a watertight pipe comprises a containing device for storing the collected liquid in the watertight pipe and a weight detection device for weighing the weight of the liquid in the containing device. The watertight pipe is provided with a first interface for outputting liquid to the outside and a second interface for receiving external liquid. A closed chamber is formed in the containing device. The first interface and the second interface are respectively connected to the closed chamber. The containing device is placed on the weight detection device. The present invention solves the technical problem of low accuracy in detecting gas intrusion in a watertight pipe.

Description

Technical Field

[0001] The invention relates to the field of offshore oil engineering, and in particular to a weighing device and a monitoring method for monitoring gas intrusion into a watertight pipe. Background Art

[0002] During deepwater drilling, gas invasion is prone to occur due to complex geological conditions. If it is not discovered in time at an early stage, it may lead to drilling accidents. Therefore, monitoring of gas invasion is a key link in deepwater well control work.

[0003] At present, the conventional monitoring method for gas intrusion is the ultrasonic Doppler monitoring method, which is to install an ultrasonic Doppler sensor on the outside of the watertight pipe and judge whether gas intrusion has occurred by the difference in sound transmission between liquid and gas. However, this method is limited to monitoring the watertight pipe during non-drilling periods. During drilling, the disturbance of the drill pipe will cause the sound wave signal to be distorted, resulting in large errors in the monitoring results.

[0004] There is currently no effective solution to the problem of low accuracy in detecting gas intrusion in risers in related technologies.

[0005] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a weighing device and a monitoring method for monitoring gas intrusion into a watertight pipe, so as to overcome the defects of the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a weighing device and a monitoring method for monitoring gas intrusion into the watertight pipe, which can collect the liquid in the watertight pipe in real time and weigh it, so as to judge whether there is gas intrusion in the watertight pipe according to the weight change of the collected liquid, and can accurately determine the invading gas content according to the weight change of the liquid, so as to effectively avoid the occurrence of drilling accidents.

[0007] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0008] The present invention provides a weighing device for monitoring gas intrusion into a watertight riser, the weighing device for monitoring gas intrusion into a watertight riser comprises a containing device for storing the collected liquid in the watertight riser and a weight detection device for weighing the weight of the liquid in the containing device, wherein: the watertight riser is respectively provided with a first interface for outputting liquid to the outside and a second interface for receiving external liquid, a closed chamber is formed in the containing device, the first interface and the second interface are respectively communicated with the closed chamber, and the containing device is placed on the weight detection device.

[0009] In a preferred embodiment of the present invention, the weighing device for monitoring gas intrusion into the watertight pipe further comprises a collection working cylinder, the collection working cylinder is a cylindrical structure with openings at both ends, the collection working cylinder is connected to the watertight pipe, and the internal space of the collection working cylinder is connected to the internal space of the watertight pipe;

[0010] An air collecting channel is formed inside the wall of the collection working cylinder, and a pressure transmission hole connecting the internal space of the collection working cylinder and the air collecting channel is provided on the inner wall of the collection working cylinder. The first interface and the second interface are respectively located on the outer wall of the collection working cylinder, and the first interface and the second interface are both connected to the air collecting channel.

[0011] In a preferred embodiment of the present invention, the gas collecting channel is an annular cavity extending along the circumference of the collecting working cylinder, and the number of the pressure transmission holes is multiple, and the pressure transmission holes are evenly distributed on the inner wall of the collecting working cylinder.

[0012] In a preferred embodiment of the present invention, the height at which the first interface is disposed on the outer wall of the collection working cylinder is higher than the height at which the second interface is disposed on the outer wall of the collection working cylinder.

[0013] In a preferred embodiment of the present invention, the weighing device for monitoring gas intrusion into the watertight pipe also includes a data processor and a terminal system, the detection signal output end of the weight detection device is connected to the detection signal receiving end of the data processor, and the data signal end of the data processor is connected to the data receiving end of the terminal system.

[0014] In a preferred embodiment of the present invention, the weighing device for monitoring gas intrusion into the watertight pipe also includes a gas detector, and the gas detector is arranged in the closed chamber, and the detection signal output end of the gas detector is connected to the detection signal receiving end of the data processor.

[0015] The present invention provides a monitoring method for monitoring gas intrusion into a watertight pipe, which adopts the above-mentioned weighing device for monitoring gas intrusion into a watertight pipe. The monitoring method for monitoring gas intrusion into a watertight pipe comprises the following steps:

[0016] Under normal drilling conditions, the liquid in the watertight pipe is collected to fill the closed chamber, and the weight of the liquid in the closed chamber is weighed as a first weight;

[0017] During drilling and gas invasion, the liquid in the watertight pipe is collected to fill the closed chamber, and the total weight of the liquid in the closed chamber and the gas invading the liquid is weighed as the second weight;

[0018] The gas content intruded into the liquid is obtained according to the first weight and the second weight.

[0019] In a preferred embodiment of the present invention, the calculation formula for obtaining the gas content invading the liquid is:

[0020]

[0021] Wherein, G1 is the first weight; G2 is the second weight; and p is the gas content invading the liquid.

[0022] In a preferred embodiment of the present invention, when the liquid in the collection riser fills the closed chamber, the liquid forms a circulation between the riser and the closed chamber.

[0023] In a preferred embodiment of the present invention, the first weight and the second weight are respectively transmitted to a terminal system via a data processor, and the terminal system records the received data and uses the received data as basic data to calculate the gas content invading the liquid.

[0024] As described above, the characteristics and advantages of the weighing device and monitoring method for monitoring gas intrusion into a watertight riser of the present invention are: a containing device with a closed chamber formed inside is connected to the watertight riser through a first interface and a second interface respectively, the liquid in the watertight riser is output to the containing device through the first interface, and the liquid discharged from the containing device is transported to the watertight riser through the second interface, thereby forming a liquid circulation between the watertight riser and the closed chamber of the containing device. During the liquid circulation process, the weight of the liquid in the containing device can be weighed in real time by a weight detection device, which can not only judge whether gas intrusion has occurred based on the difference in the weight of the liquid weighed under normal conditions and under gas invasion conditions, but also can accurately determine the gas content invading the liquid, thereby ensuring timely detection of gas intrusion and accurate acquisition of the amount of gas intrusion, and effectively avoiding the occurrence of drilling accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0026] in:

[0027] Figure 1 : It is a schematic structural diagram of the weighing device for monitoring gas intrusion into the watertight pipe according to the present invention.

[0028] Figure 2 : It is a front view cross-sectional view of the collecting working cylinder in the weighing device for monitoring gas intrusion into the watertight pipe of the present invention.

[0029] Figure 3 : It is the electrical connection block diagram of the weighing device used for monitoring gas intrusion into the watertight pipe of the present invention.

[0030] The accompanying drawings in the present invention are:

[0031] 1. Collection working cylinder; 101. Gas collection channel;

[0032] 102. pressure transmission hole; 103. first interface;

[0033] 104. Second interface; 2. Accommodating device;

[0034] 201. Sealed chamber; 3. Weight detection device;

[0035] 4. First pipeline; 5. Second pipeline;

[0036] 6. Data processor; 7. Terminal system;

[0037] 8. Gas detector; 9. Riser. DETAILED DESCRIPTION

[0038] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0039] Implementation Method 1

[0040] like Figure 1 As shown, the present invention provides a weighing device for monitoring gas intrusion into a watertight pipe, and the weighing device for monitoring gas intrusion into a watertight pipe comprises a containing device 2 and a weight detection device 3. A closed chamber 201 is formed in the containing device 2 for storing the collected liquid in the watertight pipe 9; the weight detection device 3 is used to weigh the weight of the liquid in the containing device 2. The watertight pipe 9 is provided with a first interface 103 for outputting liquid to the outside and a second interface 104 for receiving external liquid, respectively. The first interface 103 and the second interface 104 are respectively connected to the closed chamber 201, and the containing device 2 is placed on the weight detection device 3.

[0041] The present invention connects a receiving device 2 having a sealed chamber 201 formed therein and a watertight riser 9 through a first interface 103 and a second interface 104 respectively, outputs the liquid in the watertight riser 9 to the sealed chamber 201 of the receiving device 2 through the first interface 103, and discharges the liquid in the sealed chamber 201 to the watertight riser 9 through the second interface 104, thereby forming a liquid circulation between the watertight riser 9 and the sealed chamber 201 of the receiving device 2. During the circulation of the liquid, the weight of the liquid in the receiving device 2 can be weighed in real time by the weight detection device 3, which can not only judge whether gas intrusion occurs based on the difference in the weight of the liquid under normal state and under gas intrusion state, but also accurately determine the gas content invading the liquid based on the change in the weight of the liquid under different states, thereby ensuring timely detection of gas intrusion and accurate acquisition of the amount of gas intrusion, and effectively avoiding the occurrence of drilling accidents.

[0042] The weight detection device 3 may be, but is not limited to, an electronic scale, or other devices with a weighing function, which is not limited in this application. The receiving device 2 may be a sealed container, and the receiving device 2 may be capable of containing liquid, and its specific structure is not limited in this application.

[0043] In an optional embodiment of the present invention, Figure 1 As shown, the weighing device for monitoring gas intrusion into the watertight pipe also includes a collection working cylinder 1. The collection working cylinder 1 is a cylindrical structure with openings at both ends. The diameter of the collection working cylinder 1 is the same as the diameter of the watertight pipe 9, so that the collection working cylinder 1 can be connected to the watertight pipe 9 and ensure that the internal space of the collection working cylinder 1 is connected to the internal space of the watertight pipe 9; Figure 2As shown, a gas collecting channel 101 is formed inside the wall of the collection working tube 1, and a pressure transmission hole 102 connecting the internal space of the collection working tube 1 and the gas collecting channel 101 is provided on the inner wall of the collection working tube 1. The first interface 103 and the second interface 104 are respectively located on the outer wall of the collection working tube 1, and the first interface 103 and the second interface 104 are both connected to the gas collecting channel 101. In the process of collecting the liquid in the watertight pipe 9, the liquid in the watertight pipe 9 first flows into the gas collecting channel 101 through the pressure transmission hole 102, and then flows into the closed chamber 201 of the accommodating device 2 through the first interface 103. At the same time, the liquid in the closed chamber 201 will also flow back to the gas collecting channel 101 through the second interface 104, forming a liquid circulation between the watertight pipe 9 and the accommodating device 2, ensuring that the liquid in the accommodating device 2 is always in a flowing state, which helps to more accurately determine whether there is gas intrusion. In addition, the gas collecting channel 101 forms a separate cavity inside the wall of the collection working tube 1. During operation, only the liquid in the gas collecting channel 101 circulates with the closed chamber 201. Therefore, the detection of gas intrusion will not affect the normal use of the watertight pipe 9, thereby achieving the separation of liquid and gas for more accurate gas collection.

[0044] Specifically, Figure 2 As shown, the gas collecting channel 101 is a circular cavity extending along the circumference of the collecting working tube 1. There are multiple pressure transmission holes 102, and each pressure transmission hole 102 is evenly distributed on the inner wall of the collecting working tube 1, ensuring that the liquid can flow smoothly between the gas collecting channel 101 and the internal space of the watertight pipe 9.

[0045] Further, such as Figure 1 , Figure 2 As shown, since the density of gas is smaller than that of liquid, in order to facilitate the collection of gas, the setting height of the first interface 103 on the outer wall of the collection working cylinder 1 is higher than the setting height of the second interface 104 on the outer wall of the collection working cylinder 1, the first interface 103 is connected to the top of the gas collecting channel 101, and the second interface 104 is connected to the bottom of the gas collecting channel 101, the first interface 103 is connected to the accommodating device 2 through the first pipeline 4 and is connected to the upper part of the closed chamber 201, and the second interface 104 is connected to the accommodating device 2 through the second pipeline 5 and is connected to the lower part of the closed chamber 201, which helps to form a stable liquid circulation between the gas collecting channel 101 and the closed chamber 201.

[0046] Furthermore, the collection working tube 1 is located in the middle of the watertight pipe 9. When drilling and gas invasion occurs, the uniformity of the bubbles in the middle of the watertight pipe 9 is the best, so collecting the liquid in the middle of the watertight pipe 9 can improve the accuracy of monitoring, and the accuracy of the gas content in the liquid obtained at this position is also higher.

[0047] Further, such as Figure 1 As shown, the collection working tube 1 can be a section of the pipe body of the watertight pipe 9, or the collection working tube 1 can be connected in series to the pipe body of the watertight pipe 9 as a short section.

[0048] Further, such as Figure 1 As shown, since the density of gas is smaller than that of liquid, in order to facilitate the collection of gas, the height of the location of the accommodating device 2 is higher than the height of the location of the collection working cylinder 1.

[0049] In an optional embodiment of the present invention, Figure 1 , Figure 3 As shown, the weighing device for monitoring gas intrusion into the watertight pipe also includes a data processor 6 and a terminal system 7. The detection signal output end of the weight detection device 3 is connected to the detection signal receiving end of the data processor 6 through a data transmission line, and the data signal end of the data processor 6 is connected to the data receiving end of the terminal system 7 through a data transmission line or wireless transmission. The weight change of the liquid collected in the closed chamber 201 is monitored in real time by the weight detection device 3, and the monitored weight data is transmitted to the terminal system 7 through the data processor 6 for recording, and the gas content in the liquid is calculated as basic data.

[0050] The terminal system 7 may be, but is not limited to, a computer or a smart phone.

[0051] In an optional embodiment of the present invention, Figure 1 , Figure 3 As shown, the weighing device for monitoring gas intrusion into the watertight pipe also includes a gas detector 8, which is arranged in the closed chamber 201. The detection signal output end of the gas detector 8 is connected to the detection signal receiving end of the data processor 6 through a data transmission line. The gas content in the liquid can also be monitored in real time by the gas detector 8, which, in combination with the weight monitoring method, helps to improve the accuracy of monitoring and ensure that the staff can detect gas intrusion in time.

[0052] The characteristics and advantages of the weighing device for monitoring gas intrusion into a watertight pipe of the present invention are:

[0053] The weighing device for monitoring gas intrusion into the watertight riser can form a circulation flow of liquid between the watertight riser 9 and the closed chamber 201 of the accommodating device 2. During the circulation of the liquid, the weight of the liquid in the accommodating device 2 is weighed in real time by the weight detection device 3. It can not only judge whether gas intrusion has occurred based on the difference in the weight of the liquid under normal state and under gas invasion state, but also accurately determine the gas content invading the liquid based on the change in the weight of the liquid under different states, thereby ensuring timely detection of gas intrusion and accurate acquisition of the amount of gas intrusion, and effectively avoiding the occurrence of drilling accidents.

[0054] Implementation Method 2

[0055] The present invention provides a monitoring method for monitoring gas intrusion into a watertight pipe, which adopts the above-mentioned weighing device for monitoring gas intrusion into a watertight pipe. The monitoring method for monitoring gas intrusion into a watertight pipe comprises the following steps:

[0056] Step S1: Under normal drilling conditions, the liquid in the watertight pipe 9 is collected to fill the sealed chamber 201 of the accommodating device 2, and the weight of the liquid in the sealed chamber 201 is weighed by the weight detection device 3 as a first weight G1;

[0057] Step S2: During drilling and gas invasion, the liquid in the watertight pipe 9 is collected to fill the sealed chamber 201 of the accommodating device 2, and the total weight of the liquid in the sealed chamber 201 and the gas invading the liquid is weighed as the second weight G2;

[0058] Step S3: Obtain the gas content p invading the liquid according to the first weight G1 and the second weight G2.

[0059] In an optional embodiment of the present invention, in step S3, the first weight G1 and the second weight G2 are respectively transmitted to the terminal system 7 through the data processor 6. The terminal system 7 records the received data (i.e., the first weight G1 and the second weight G2), and uses the received data as the basic data to calculate the gas content p invading the liquid.

[0060] Furthermore, in step S3, the calculation formula for obtaining the gas content p invading the liquid is:

[0061]

[0062] Wherein, G1 is the first weight; G2 is the second weight; and p is the gas content invading the liquid.

[0063] Furthermore, in step S1 and step S2, when the liquid in the watertight pipe 9 is collected and fills the closed chamber 201, it is necessary to ensure that the liquid circulates between the watertight pipe 9 and the closed chamber 201 to improve the accuracy of the collected first weight G1 and second weight G2, so as to accurately calculate the gas content p invading the liquid.

[0064] The characteristics and advantages of the monitoring method for monitoring gas intrusion into a watertight pipe of the present invention are:

[0065] The monitoring method for monitoring gas intrusion into watertight pipes weighs the weight of liquid collected under different states (i.e., normal drilling state and gas invasion state). It can not only judge whether gas invasion has occurred based on the difference in the weight of liquid weighed under normal state and gas invasion state, but also accurately determine the gas content invaded in the liquid based on the change in liquid weight under different states, thereby ensuring timely detection of gas invasion and accurate acquisition of the amount of gas invasion, and effectively avoiding the occurrence of drilling accidents. The method is simple to operate and has high accuracy, and is suitable for popularization and use.

[0066] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A weighing device for monitoring gas intrusion into a watertight pipe, characterized in that: The weighing device for monitoring gas intrusion into the watertight pipe comprises a containing device for storing the collected liquid in the watertight pipe and a weight detection device for weighing the weight of the liquid in the containing device, wherein: the watertight pipe is respectively provided with a first interface for outputting liquid to the outside and a second interface for receiving external liquid, a closed chamber is formed in the containing device, the first interface and the second interface are respectively communicated with the closed chamber, and the containing device is placed on the weight detection device; The weighing device for monitoring gas intrusion into the watertight pipe also includes a collection working cylinder, which is a cylindrical structure with two ends open, and is connected to the watertight pipe, and the internal space of the collection working cylinder is connected to the internal space of the watertight pipe; An air collecting channel is formed inside the wall of the collection working cylinder, and a pressure transmission hole connecting the internal space of the collection working cylinder and the air collecting channel is provided on the inner wall of the collection working cylinder. The first interface and the second interface are respectively located on the outer wall of the collection working cylinder, and the first interface and the second interface are both connected to the air collecting channel.

2. The weighing device for monitoring gas intrusion into a watertight pipe according to claim 1, characterized in that: The gas collecting channel is an annular cavity extending along the circumference of the collecting working cylinder. The number of the pressure transmission holes is multiple, and the pressure transmission holes are evenly distributed on the inner wall of the collecting working cylinder.

3. The weighing device for monitoring gas intrusion into a watertight pipe according to claim 1, characterized in that: The setting height of the first interface on the outer wall of the collection working cylinder is higher than the setting height of the second interface on the outer wall of the collection working cylinder.

4. The weighing device for monitoring gas intrusion into a watertight pipe according to claim 1, characterized in that: The weighing device for monitoring gas intrusion into the watertight pipe also includes a data processor and a terminal system. The detection signal output end of the weight detection device is connected to the detection signal receiving end of the data processor, and the data signal end of the data processor is connected to the data receiving end of the terminal system.

5. The weighing device for monitoring gas intrusion into a watertight pipe according to claim 4, characterized in that: The weighing device for monitoring gas intrusion into the watertight pipe also includes a gas detector, which is arranged in the closed chamber, and the detection signal output end of the gas detector is connected to the detection signal receiving end of the data processor.

6. A method for monitoring gas intrusion into a watertight pipe, characterized in that: It adopts the weighing device for monitoring gas intrusion into the watertight pipe according to any one of claims 1 to 5, and the monitoring method for monitoring gas intrusion into the watertight pipe comprises the following steps: Under normal drilling conditions, the liquid in the watertight pipe is collected to fill the closed chamber, and the weight of the liquid in the closed chamber is weighed as a first weight; During drilling and gas invasion, the liquid in the watertight pipe is collected to fill the closed chamber, and the total weight of the liquid in the closed chamber and the gas invading the liquid is weighed as the second weight; The gas content intruded into the liquid is obtained according to the first weight and the second weight.

7. The method for monitoring gas intrusion into a watertight pipe according to claim 6, characterized in that: The calculation formula for obtaining the gas content invading the liquid is: Wherein, G1 is the first weight; G2 is the second weight; and p is the gas content invading the liquid.

8. The method for monitoring gas intrusion into a watertight pipe according to claim 6, characterized in that: When the liquid in the collection riser fills the closed chamber, the liquid forms a circulation between the riser and the closed chamber.

9. The method for monitoring gas intrusion into a watertight pipe according to claim 6, characterized in that: The first weight and the second weight are respectively transmitted to the terminal system through the data processor, and the terminal system records the received data and calculates the gas content invading the liquid based on the received data.

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