An old well open hole re-entry tracking and identification tool and method for gas storage

Abstract

The present invention relates to a tracking and identification tool and method for re-entering the open hole of an old well in a gas storage reservoir. The tool includes a transducer and an ultrasonic active signal transmitting and receiving control unit. The transducer is fixedly connected and communicatively connected to the ultrasonic active signal transmitting and receiving control unit. The ultrasonic active signal transmitting and receiving control unit is used to control the transducer to transmit and receive ultrasonic signals, and is also used to transmit the real-time data detected by the transducer to the receiving terminal on the ground. The beneficial effect of the present invention is that, based on the tool for real-time detecting the borehole diameter by ultrasonic waves, the borehole diameter change data of the newly drilled wellbore is obtained in real time. By using the borehole diameter shape distribution and enlargement rate data in this area, as well as the calculation model for the relative position and coincidence relationship between the newly drilled wellbore and the old wellbore, the re-entry degree of the newly drilled wellbore is judged. The present invention can solve the problems of poor tracking and identification accuracy and poor timeliness in the open hole section of the old well in the gas storage reservoir, and provide a feasible principle method for the tracking and identification of the open hole section of the old well in the gas storage reservoir.

Description

Technical Field

[0001] The present invention relates to the technical field of treatment of old wells in gas storage reservoirs, and particularly to a tool and method for tracking and identifying open-hole re-entry of old wells in gas storage reservoirs. Background Art

[0002] Gas storage reservoirs can realize the strategic reserve and seasonal peak shaving of natural gas resources, and are important carriers to ensure the safe and efficient operation of the national economy. Among them, during the process of converting depleted oil and gas reservoirs into gas storage reservoirs, some complex old wells need to be effectively plugged to ensure the safe operation of the gas storage reservoir in the later stage. At present, a series of old wellbore tracking and re-entry technologies represented by magnetic guidance have been formed. This technology judges the azimuth of the old wellbore by capturing the magnetic signals of the casing in the old wellbore, so as to realize the re-entry and plugging of the old wellbore. However, for some open-hole old wells, the wellbore has been filled with original cuttings and collapsed well walls and compacted. Although the old wellbore has been filled with fillers, it does not have good sealing performance by itself. If these old buried wellbores are not re-entered and plugged, it will inevitably bring great potential safety hazards to the later operation of the gas storage reservoir.

[0003] To achieve efficient plugging, when re-drilling into the old wellbore, it is necessary to ensure that the new wellbore falls within the range of the old wellbore and can drill along the old wellbore for a certain distance to reopen the old wellbore and provide operating conditions for subsequent plugging. At present, some methods for judging open-hole re-entry of old wells such as specific energy of rock breaking and analysis of cuttings composition have been formed, but they all have defects such as poor accuracy and poor timeliness. At the same time, for deep easily collapsible formations, there is no obvious difference in the specific energy of rock breaking between re-entering the original wellbore and newly drilling a new wellbore, and due to the irregular well diameter, it is difficult for salt cuttings to return, and it is difficult to judge whether to re-enter the original wellbore. Therefore, it is urgent to explore a new method and supporting process technology for tracking and identifying open-hole re-entry of old wells in gas storage reservoirs to achieve accurate tracking and identification of the open-hole section of old wells. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a tool and method for tracking and identifying open-hole re-entry of old wells in gas storage reservoirs, aiming to solve the problems in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A tool for tracking and identifying open-hole re-entry of old wells in gas storage reservoirs includes a transducer and an ultrasonic active signal transmitting and receiving control unit. The transducer is fixedly connected and communicatively connected to the ultrasonic active signal transmitting and receiving control unit. The ultrasonic active signal transmitting and receiving control unit is used to control the transducer to transmit and receive ultrasonic signals, and is also used to transmit the real-time data detected by the transducer to a receiving terminal on the ground.

[0007] The beneficial effects of the present invention are as follows: During detection, the ultrasonic active signal transmitting and receiving control unit is used to control the transducer to emit ultrasonic signals. After the ultrasonic signals contact the wellbore wall and return, they are received by the transducer, and the transducer sends the corresponding signals to the ultrasonic active signal transmitting and receiving control unit. The ultrasonic active signal transmitting and receiving control unit receives the corresponding signals, calculates the wellbore diameter of the new wellbore, and sends the corresponding wellbore diameter data to the receiving terminal on the ground. The receiving terminal compares and analyzes the data of the wellbore diameter of the new wellbore and the old wellbore to determine the coincidence degree between the new wellbore and the old wellbore.

[0008] The present invention is based on an ultrasonic real-time wellbore diameter detection tool, which can obtain the wellbore diameter change data of a newly drilled wellbore in real time. By using the wellbore diameter distribution and enlargement rate data in this area, as well as the calculation model of the relative position and coincidence relationship between the newly drilled wellbore and the old wellbore, the re-entry degree of the newly drilled wellbore can be judged. The present invention can solve the problems such as poor tracking and recognition accuracy and poor timeliness of the open-hole section of old gas storage wells, and provides a feasible principle method for tracking and recognizing the open-hole section of old gas storage wells.

[0009] On the basis of the above technical solution, the present invention can be further improved as follows.

[0010] Further, the transducer includes a plurality of ultrasonic transducers. The plurality of ultrasonic transducers are connected to each other and are respectively communicatively connected to the ultrasonic active signal transmitting and receiving control unit, and are respectively used for transmitting and receiving ultrasonic signals.

[0011] The beneficial effect of adopting the above further solution is that the structure is simple, the design is reasonable, and the accuracy of wellbore diameter detection is improved.

[0012] Further, the plurality of ultrasonic transducers are evenly spaced in a circumferential manner, and two adjacent

[0013] ultrasonic transducers are connected by an ultrasonic transducer short joint.

[0014] The beneficial effect of adopting the above further solution is that the structure is simple, the design is reasonable, the distribution of the plurality of ultrasonic transducers is reasonable, and the accuracy of wellbore diameter detection is improved.

[0015] Further, the transducer further includes a protective housing. The plurality of ultrasonic transducers are respectively installed

[0016] in the protective housing, and the ultrasonic active signal transmitting and receiving control unit is fixedly connected to the protective housing.

[0017] The beneficial effect of adopting the above further solution is that the structure is simple, the design is reasonable, and the design of the protective housing can not only protect the plurality of ultrasonic transducers, but also realize the quick connection with other components.

[0018] Further, it also includes a signal amplification, digital conversion and storage unit, and the signal amplification, digital conversion

[0019] and storage unit is fixedly connected and communicatively connected to the ultrasonic active signal transmitting and receiving control unit.

[0020] The beneficial effect of adopting the above further solution is that during detection, the ultrasonic echo signal is amplified by the signal amplification, digital conversion and storage unit and digitally processed for the receiving terminal on the ground to process.

[0021] Further, it also includes a communication telemetry sub, and the communication telemetry sub is fixedly connected and communicatively connected to the signal amplification digital

[0022] conversion and storage unit.

[0023] The beneficial effect of adopting the above further solution is that during detection, the data signal obtained downhole is transmitted to the receiving terminal on the ground in real time through the communication telemetry sub, which is convenient for transmission.

[0024] Further, it also includes an upper sub, and the upper sub is fixedly installed on the communication telemetry sub,

[0025] for connecting the drilling string.

[0026] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable. The tracking and identification tool and the drilling string are connected through the upper sub so as to place the tracking and identification tool downhole for convenient detection.

[0027] Further, one end of the communication telemetry sub is connected to a cable, and the other end of the cable is used for

[0028] connecting to the receiving terminal outside the well.

[0029] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable. The communication telemetry sub is connected to the receiving terminal through the cable, which can not only realize the transmission of data inside and outside the well, but also supply power to each component, making it convenient to use.

[0030] Further, it also includes a lower sub, and the lower sub is fixedly connected to the transducer for connecting

[0031] drilling tools.

[0032] The beneficial effect of adopting the above further solution is that the structure is simple and the design is reasonable. The drilling tools can be conveniently connected through the lower sub for drilling operations.

[0033] The present invention also relates to a method for tracking and identifying the re-entry of an old wellbore in a gas storage reservoir, adopting the above-mentioned

[0034] The tracking and identification tool performs tracking and identification, including the following specific steps:

[0035] S1: Statistically analyze the morphological distribution characteristics of old wellbores and the data of hole diameter enlargement rate in this area;

[0036] S2: Detect the real-time data of the hole diameter change of the new wellbore through a transducer, and transmit it to the receiving terminal on the ground through the ultrasonic active signal transmitting and receiving control unit;

[0037] S3: Compare the real-time data of the bottom hole diameter obtained by the receiving terminal with the statistical data of this area,

[0038] and screen out abnormal data;

[0039] S4: Substitute the screened abnormal hole diameter data into the calculation model of the relative position and coincidence relationship between the new wellbore and the old wellbore, so as to judge the degree of re-entry of the new wellbore into the old wellbore.

[0040] The beneficial effect of adopting the above further solution is that the present invention is based on an ultrasonic real-time detection tool for hole diameter size, which can obtain the hole diameter change data of the newly drilled wellbore in real time. By comparing with the hole diameter morphological distribution and enlargement rate data in this area, as well as the calculation model of the relative position and coincidence relationship between the newly drilled wellbore and the old wellbore, it can judge the degree of re-entry of the newly drilled wellbore. The present invention can solve the problems of poor tracking and identification accuracy and poor timeliness in the open hole section of old wells in gas storage reservoirs, and provide a feasible principle method for the tracking and identification of the open hole section of old wells in gas storage reservoirs. Description of the Drawings

[0041] Figure 1 It is a schematic structural diagram of the detection tool in the present invention;

[0042] Figure 2 It is a schematic distribution diagram of ultrasonic transducers in the present invention;

[0043] Figure 3 It is a distribution diagram when the new wellbore and the old wellbore completely coincide in the present invention;

[0044] Figure 4 It is a distribution diagram when the new wellbore and the old wellbore partially coincide in the present invention;

[0045] Figure 5 It is a distribution diagram when the new wellbore and the old wellbore do not coincide in the present invention;

[0046] Figure 6 It is an abnormal diagram of obvious change in hole diameter when the new wellbore falls into the open hole section of the old well in the present invention.

[0047] In the drawings, the list of components represented by each reference numeral is as follows:

[0048] 1. Cable; 2. Upper joint; 3. Communication telemetry sub-section; 4. Signal amplification digital conversion and storage unit; 5. Ultrasonic active signal transmitting and receiving control unit; 6. Ultrasonic transducer; 7. Protective housing; 8. Lower joint; 9. Ultrasonic transducer sub-section; 10. Old wellbore; 11. New wellbore. Detailed implementation mode

[0049] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0050] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0051] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0052] The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0053] Embodiment 1

[0054] As Figure 1 paper Figure 6As shown in the figure, this embodiment provides a tracking and identification tool for re-entering the open hole of an old well in a gas storage reservoir, which includes a transducer and an ultrasonic active signal transmitting and receiving control unit 5. The transducer is fixedly connected and communicatively connected to the ultrasonic active signal transmitting and receiving control unit 5. The ultrasonic active signal transmitting and receiving control unit 5 is used to control the transducer to transmit and receive ultrasonic signals, and is also used to transmit the real-time data detected by the transducer to the receiving terminal on the ground.

[0055] During detection, the ultrasonic active signal transmitting and receiving control unit 5 is used to control the transducer to transmit ultrasonic signals. After the ultrasonic signals contact the wellbore wall and return, they are received by the transducer, and the transducer sends the corresponding signals to the ultrasonic active signal transmitting and receiving control unit 5. The ultrasonic active signal transmitting and receiving control unit 5 receives the corresponding signals and calculates the wellbore diameter of the new wellbore, and sends the corresponding wellbore diameter data to the receiving terminal on the ground. The receiving terminal compares and analyzes the wellbore diameter data of the new wellbore and the old wellbore to judge the coincidence degree between the new wellbore 11 and the old wellbore 10.

[0056] Based on the ultrasonic real-time wellbore diameter detection tool in this embodiment, the wellbore diameter change data of the newly drilled wellbore is obtained in real time. By comparing with the wellbore diameter distribution and enlargement rate data in this area, as well as the relative position and coincidence relationship calculation model constructed between the newly drilled wellbore and the old wellbore, the re-entry degree of the newly drilled wellbore is judged. The present invention can solve the problems such as poor tracking and identification accuracy and poor timeliness of the open hole section of the old well in the gas storage reservoir, and provides a feasible principle method for tracking and identifying the open hole section of the old well in the gas storage reservoir.

[0057] Embodiment 2

[0058] On the basis of Embodiment 1, in this embodiment, the transducer includes a plurality of ultrasonic transducers

[0059] 6. The plurality of ultrasonic transducers 6 are connected to each other and are respectively communicatively connected to the ultrasonic active signal transmitting and receiving control unit 5, and are respectively used to transmit and receive ultrasonic signals.

[0060] This scheme has a simple structure and reasonable design, which improves the accuracy of wellbore diameter detection.

[0061] Embodiment 3

[0062] On the basis of Embodiment 2, in this embodiment, the plurality of ultrasonic transducers 6 are evenly spaced in a circle

[0063] and are connected by an ultrasonic transducer short joint 9 between adjacent two ultrasonic transducers 6.

[0064] This scheme has a simple structure and reasonable design. The plurality of ultrasonic transducers 6 are reasonably distributed, which improves the accuracy of wellbore diameter detection.

[0065] Example 4

[0066] Based on any one of Embodiment 2 to Embodiment 3, in this embodiment, the transducer further includes a protective housing 7, and a plurality of the ultrasonic transducers 6 are respectively installed in the protective housing 7, and the ultrasonic active signal transmitting and receiving control unit 5 is fixedly connected to the protective housing 7.

[0067] This solution has a simple structure and reasonable design. Designing the protective housing 7 can not only protect the plurality of ultrasonic transducers

[0068] 6, but also realize quick connection with other components.

[0069] Preferably, in this embodiment, the above-mentioned protective housing 7 preferably has a cylindrical structure with both upper and lower ends open.

[0070] In addition, an annular cavity is provided in its side wall, and a plurality of ultrasonic transducers 6 are respectively fixedly installed in the above-mentioned annular cavity.

[0071] Example 5

[0072] Based on the above embodiments, this embodiment further includes a signal amplification digital conversion and storage unit 4, and the signal amplification digital conversion and storage unit 4 is fixedly connected and communicatively connected to the ultrasonic active signal transmitting and receiving control unit 5.

[0073] During detection, the ultrasonic echo signal is amplified by the signal amplification digital conversion and storage unit 4 and digitally processed for the receiving terminal on the ground to process.

[0074] Example 6

[0075] Based on Example 5, this embodiment further includes a communication telemetry sub-section 3, and the communication telemetry sub-section 3 is fixedly connected and communicatively connected to the signal amplification digital conversion and storage unit 4.

[0076] During detection, the data signal obtained downhole is transmitted to the receiving terminal on the ground in real time through the communication telemetry sub-section 3, and the transmission is convenient.

[0077] Example 7

[0078] Based on Example 6, this embodiment further includes an upper sub 2, and the upper sub 2 is fixedly installed

[0079] on the communication telemetry sub-section 3 and is used for connecting the drilling string.

[0080] This solution has a simple structure and reasonable design. By connecting the tracking and identification tool and the drilling string through the upper sub 2, the tracking and identification tool can be lowered into the well for convenient detection.

[0081] Preferably, in this embodiment, the upper joint 2 has a cylindrical structure with both ends open. One end thereof is threadedly connected to the corresponding end of the communication telemetry sub 3, and the other end is threadedly connected to the drilling string, which is convenient for disassembly and assembly.

[0082] Based on the above solution, the upper joint 2, the communication telemetry sub 3, the signal amplification digital conversion and storage

[0083] unit 4, the ultrasonic active signal transmitting and receiving control unit 5, and the protective housing 7 are distributed in sequence from top to bottom and are threadedly connected in sequence, which is convenient for disassembly and assembly.

[0084] Embodiment 8

[0085] Based on any one of Embodiments 6 to 7, in this embodiment, the communication telemetry sub 3 is connected to one end of the cable 1, and the other end of the cable 1 is used to connect to a receiving terminal outside the well.

[0086] This solution has a simple structure and reasonable design. The communication telemetry sub 3 is connected to the receiving terminal through the cable 1, which can not only realize the transmission of data inside and outside the well, but also supply power to each component, and is convenient to use.

[0087] Based on the above solution, a plurality of ultrasonic transducers 6 are connected in sequence through cables, and the

[0088] ultrasonic transducer 6 at the end is connected to the ultrasonic active signal transmitting and receiving control unit 5 through a cable. The ultrasonic active signal transmitting and receiving control unit 5, the signal amplification digital conversion and storage unit 4, and the communication telemetry sub 3 are connected in sequence through cables, and the communication telemetry sub 3 is connected to the receiving terminal through the cable 1.

[0089] Embodiment 9

[0090] Based on the above embodiments, this embodiment further includes a lower joint 8, and the lower joint 8 is fixedly connected to the transducer and is used to connect the drill tool.

[0091] This solution has a simple structure and reasonable design. The drill tool can be conveniently connected through the lower joint 8 for drilling operations.

[0092] Preferably, in this embodiment, the lower joint 8 has a cylindrical structure with both ends open. One end thereof is threadedly connected to the corresponding end of the protective housing 7, and the other end can be threadedly connected to the drill tool, which is convenient for disassembly and assembly.

[0093] Embodiment 10

[0094] Based on the above embodiments, this embodiment further provides a method for tracking and identifying the re-entry of an old wellbore in a gas storage reservoir. The tracking and identification is carried out by using the above-mentioned tracking and identification tool, and includes the following specific steps:

[0095] Track and identify using the tracking and identification tool as described above, including the following specific steps:

[0096] S1: Statistics of the morphological distribution characteristics and well diameter expansion rate data of the old wellbore 10 in the area;

[0097] S2: Detecting the real-time data of the change of the diameter of the new wellbore 11 through the transducer, and transmitting it to the receiving terminal on the ground through the ultrasonic active signal transmitting and receiving control unit 5;

[0098] S3: The real-time data of the bottom hole diameter obtained by the receiving terminal is compared with the statistical data of the area.

[0099] Filter out abnormal data;

[0100] S4: The screened wellbore anomaly data is substituted into the constructed calculation model of the relative position and coincidence relationship between the new wellbore 11 and the old wellbore 10, so as to determine the extent to which the new wellbore 11 re-enters the old wellbore 10.

[0101] This embodiment uses an ultrasonic real-time detection tool to detect the borehole size, obtains the borehole diameter change data of the newly drilled borehole in real time, and determines the re-entry degree of the newly drilled borehole by comparing it with the borehole diameter morphology distribution and expansion rate data in the area, as well as the constructed relative position and coincidence relationship calculation model of the newly drilled borehole and the old borehole. The present invention can solve the problems of poor tracking and identification accuracy and poor timeliness of the open hole section of the old wells in the gas storage, and provides a feasible principle method for tracking and identifying the open hole section of the old wells in the gas storage.

[0102] In adjacent areas of the same region, during the drilling process, the change law of the wellbore diameter and the borehole expansion rate of the newly drilled wells are basically the same, and there will be no significant differences. However, when the purpose of drilling a new well is to reopen the old well hole, or even to re-enter the old wellbore, the wellbore diameter change of the newly drilled wellbore will be abnormal. The reason is that the old wellbore is full of original rock cuttings and wellbore collapse deposits. The compaction degree of these sediments is relatively low. When re-drilling, the under-compacted sediments in the wellbore can easily circulate out of the well with the circulating drilling fluid, resulting in abnormal changes in the wellbore diameter of the newly drilled wellbore and a significant increase in the borehole expansion rate. First, the wellbore diameter data of wells with different borehole sizes that have been drilled in the area are counted as a basis for subsequent data comparison. The wellbore diameter data of wells with different borehole sizes that have been drilled are expressed as:

[0103] , (1)

[0104] Among them, R p is the wellbore diameter data of the drilled well, r is the drill bit size of the old wellbore, and h is the well depth where the data is located.

[0105] The well diameter expansion rate is:

[0106] , (2)

[0107] Among them, Dp is the average hole enlargement rate of the old wellbore, and n is the number of statistical samples.

[0108] During the drilling process, an ultrasonic real-time wellbore diameter detection tool is added to the bottom hole assembly. The short section is circumferentially distributed with a transceiver integrated ultrasonic transducer, which is equipped with a signal amplification processing and transmission module. The detection signal can be transmitted to the ground in real time through a cable. The ground processes the signal and presents the wellbore diameter change data in real time. The wellbore diameter data of the new well is as follows:

[0109] , (3)

[0110] Among them, R N is the wellbore diameter data of the new well, r N is the bit size of the new well, h N is the well depth where the new well data is located.

[0111] The hole enlargement rate of the new wellbore is:

[0112] , (4)

[0113] Compare the hole enlargement rate of the new wellbore with that of the old wellbore. The difference coefficient between the two is:

[0114] , (5)

[0115] F is the difference coefficient between the hole enlargement rate of the new wellbore and that of the old wellbore. To facilitate the distinction of the difference coefficients in different scenarios, the construction bit size rN of the new wellbore is selected to be more than 10% smaller than the bit of the old wellbore. If F exceeds 20%, it is judged as abnormal wellbore diameter data.

[0116] When the new wellbore and the old wellbore do not coincide, it indicates abnormal wellbore diameter.

[0117] When the new wellbore and the old wellbore coincide, the hole enlargement rate of the new wellbore is used to define the coincidence degree of the new wellbore and the old wellbore, and then to directionally evaluate the re-entry degree of the new wellbore. When the new wellbore completely re-enters the old wellbore, its hole enlargement rate is the largest, and the hole limit enlargement can extend to the size of the old wellbore. Define the coincidence degree of the two wellbores in this extreme case as 1. Then, in any case, the coincidence degree calculation formula of the new wellbore and the old wellbore can be obtained:

[0118] , (6)

[0119] According to the coincidence degree L of the new wellbore and the old wellbore calculated above, the re-entry degree of the new wellbore can be further judged, and then the adjustment of the next drilling azimuth can be guided, and finally the real-time accurate identification and tracking of the open hole section of the old wellbore in the gas storage reservoir can be realized.

[0120] The working principle of the present invention is as follows:

[0121] S1: Statistically analyze the morphological distribution characteristics of old wellbores in the area and the data of hole enlargement rate;

[0122] S2: Detect the real-time data of the hole diameter change of the new wellbore through a transducer, and transmit it to the receiving terminal on the ground through the ultrasonic active signal transmitting and receiving control unit 5;

[0123] S3: Compare the real-time hole diameter data at the bottom of the well obtained by the receiving terminal with the statistical data of the area,

[0124] and screen out abnormal data;

[0125] S4: Substitute the screened abnormal hole diameter data into the calculation model of the relative position and coincidence relationship between the new drilled wellbore and the old wellbore, so as to judge the degree of re-entry of the new drilled wellbore into the old wellbore.

[0126] Figure 3 It shows that the new wellbore and the old wellbore are completely coincident. At this time, the new wellbore completely falls within the range of the old wellbore, the hole enlargement rate is the largest, the hole diameter shape is regular, and the measurement results of the two curves of the hole diameter on the four walls are basically the same.

[0127] Figure 4 It shows that the new wellbore and the old wellbore are partially coincident. At this time, a part of the new wellbore falls within the range of the old wellbore, the hole enlargement rate is the second, the hole diameter shape is irregular, and the measurement results of the two curves of the hole diameter on the four walls have a large difference.

[0128] Figure 5 It shows that the new wellbore and the old wellbore have no intersection. At this time, the new wellbore is outside the range of the old wellbore. In this case, the hole enlargement rate of the new drilled wellbore is the smallest, and there is no significant difference from the hole enlargement rate data of the adjacent wellbores in this area. The measurement results of the two curves of the hole diameter on the four walls are basically the same.

[0129] Figure 6 In [figure] A refers to the abnormal hole diameter data. The figure shows that a significant mutation has occurred in the hole diameter data at A, deviating from the normal value, indicating that the hole size at this place is significantly enlarged. The larger the mutation amplitude of the hole diameter data, the greater the hole enlargement rate at this place. The factors affecting the hole diameter data include formation parameters, drilling parameters, etc. By comparing with the hole diameter data of this area and excluding the influence of different formation layers and drilling parameters, it can be judged whether the new drilled wellbore enters the original open hole.

[0130] Final conclusion: Judge whether the new wellbore and the old wellbore coincide by judging whether the hole diameter data is abnormal. When the new wellbore and the old wellbore coincide, it is necessary to judge the degree of coincidence and move the position of the drilling according to the degree of coincidence (during the movement, it is also necessary to continuously detect according to the above scheme). Finally, it is necessary to make the new wellbore and the old wellbore completely coincide.

[0131] The method and tool for tracking and identifying the re-entry of the open hole of old gas storage wells based on abnormal borehole diameter display proposed by the present invention mainly detect the borehole size during drilling in real time, judge the abnormal change of the borehole diameter, so as to realize the accurate tracking and identification of the open hole section of the old well. The principle is as follows: Generally, the size of the newly drilled borehole is smaller than that of the old wellbore. When the newly drilled borehole does not fall within the range of the old wellbore, the borehole enlargement rate and the distribution of the borehole diameter shape of the newly drilled borehole will conform to the change characteristics of the borehole diameter of the completed wells in this area, and there will be no obvious abnormal borehole diameter phenomenon. When there is partial overlap between the newly drilled borehole and the old wellbore, the borehole diameter in the direction towards the old wellbore will show an obvious enlargement phenomenon. Because the open hole section deposited in the old wellbore is in an undercompacted state, when the circulating large-displacement drilling fluid passes through, it will circulate the undercompacted wellbore wall of the old wellbore to the ground, thereby increasing the borehole enlargement rate and causing abnormal changes in the borehole diameter of the newly drilled borehole. When the newly drilled borehole completely falls within the range of the old wellbore, the borehole diameter in all directions of the new wellbore will show an obvious enlargement phenomenon, and at this time, the abnormal borehole diameter phenomenon of the newly drilled borehole is the most obvious. It is possible to judge whether the newly drilled borehole falls within the range of the old wellbore by judging parameters such as the borehole enlargement rate and the distribution characteristics of the borehole shape of the newly drilled borehole. First, it is necessary to count the distribution characteristics of the borehole shape and the borehole enlargement rate data in this area to provide basic data and basis for subsequent judgment. Subsequently, an ultrasonic real-time borehole diameter detection tool is added to the bottom hole assembly during drilling. This short section is circumferentially distributed with a transceiver-integrated ultrasonic transducer, which is equipped with a signal amplification processing and transmission module. The detection signal can be transmitted to the ground in real time through a cable. The ground processes the signal, presents the change data of the borehole diameter in real time, analyzes and calculates the borehole enlargement rate and the shape distribution, and compares them with the statistically obtained borehole shape and borehole enlargement rate in this area to judge whether the data is abnormal. If the borehole diameter data is abnormal, a calculation model of the relative position and coincidence relationship between the newly drilled borehole and the old wellbore is used to judge the re-entry degree of the newly drilled borehole, and then guide the adjustment of the next drilling direction.

[0132] The present invention can realize the real-time detection of the borehole size and the general shape distribution during drilling. The data is transmitted to the ground through a cable for processing and analysis. The processed data, together with the borehole diameter shape distribution and enlargement rate data in this area, and the calculation model of the relative position and coincidence relationship between the newly drilled borehole and the old wellbore, are used to judge the re-entry degree of the newly drilled borehole, so as to realize the tracking and identification of the re-entry of the open hole of the old gas storage well.

[0133] It should be noted that all the electronic components involved in the present invention adopt existing technologies, and the above-mentioned components are electrically connected to each other, and the control circuits between the components are existing technologies.

[0134] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0135] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0136] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for tracking and identifying the re-entry of an old wellbore in a gas storage reservoir, characterized in that, The method includes the following specific steps: S1: Statistically analyze the wellbore diameter data R of the drilled wells in the study area P and the average wellbore diameter enlargement rate of the old wellbores (10) Data D P ; S2: Detect the hole diameter data R of the new wellbore through the transducer N , and calculate the hole diameter enlargement rate D of the new wellbore (11) N , and transmit it to the receiving terminal on the ground through the ultrasonic active signal transmitting and receiving control unit (5); S3: Compare the hole diameter enlargement rate of the new wellbore with that of the old wellbore. The difference coefficient between the two is: If F exceeds 20%, it is determined as abnormal hole diameter data. S4: Substitute the selected abnormal hole diameter data into the following calculation formula for the coincidence degree between the new wellbore and the old wellbore: Thereby, determine the degree of re-entry of the new wellbore (11) into the old wellbore (10). The invention also relates to a tracking and identification tool for re-entry of the open hole of an old well in a gas storage reservoir, which includes a transducer and an ultrasonic active signal transmitting and receiving control unit (5). The transducer is fixedly connected and communicatively connected to the ultrasonic active signal transmitting and receiving control unit (5). The ultrasonic active signal transmitting and receiving control unit (5) is used to control the transducer to transmit and receive ultrasonic signals, and is also used to transmit the real-time data detected by the transducer to a receiving terminal on the ground.

2. The method for tracking and identifying the re-entry of the open hole of an old well in a gas storage reservoir according to claim 1, wherein: The transducer includes a plurality of ultrasonic transducers (6). The plurality of ultrasonic transducers (6) are connected to each other and are respectively communicatively connected to the ultrasonic active signal transmitting and receiving control unit (5), and are respectively used to transmit and receive ultrasonic signals.

3. The method for tracking and identifying the open-hole re-entry of old wells in the gas storage reservoir according to claim 2, characterized in that: The plurality of ultrasonic transducers (6) are evenly distributed at intervals in a circumferential direction, and adjacent two ultrasonic transducers (6) are connected by an ultrasonic transducer sub-joint (9).

4. The method for tracking and identifying the open-hole re-entry of old wells in the gas storage reservoir according to claim 2, characterized in that: The transducer further includes a protective housing (7). The plurality of ultrasonic transducers (6) are respectively installed in the protective housing (7), and the ultrasonic active signal transmitting and receiving control unit (5) is fixedly connected to the protective housing (7).

5. The method for tracking and identifying the re-entry of the open hole of the old well in the gas storage reservoir according to any one of claims 1-4, characterized in that: The tool further includes a signal amplification, digital conversion and storage unit (4). The signal amplification, digital conversion and storage unit (4) is fixedly connected and communicatively connected to the ultrasonic active signal transmitting and receiving control unit (5).

6. The method for tracking and identifying the open-hole re-entry of old wells in a gas storage reservoir according to claim 5, wherein: The tool further includes a communication telemetry sub-joint (3). The communication telemetry sub-joint (3) is fixedly connected and communicatively connected to the signal amplification, digital conversion and storage unit (4).

7. The method for tracking and identifying the re-entry of the open hole of an old well in a gas storage reservoir according to claim 6, wherein: The tool further includes an upper sub (2). The upper sub (2) is fixedly installed on the communication telemetry sub-joint (3) and is used to connect the drilling string.

8. The method for tracking and identifying the re-entry of the open hole of an old well in a gas storage reservoir according to claim 6, wherein: One end of the communication telemetry sub-joint (3) is connected to a cable (1), and the other end of the cable (1) is used to connect to a receiving terminal outside the well.

9. The method for tracking and identifying the re-entry of the open hole of an old well in a gas storage reservoir according to any one of claims 1-4, characterized in that: The tool further includes a lower sub (8). The lower sub (8) is fixedly connected to the transducer and is used to connect the drill string.

Images