Tool string positioning device

Abstract

The present invention provides a tool string positioning device. The tool string positioning device of the present invention comprises: a magnetic signal generator arranged at the bottom of the tool string and a first magnetic signal detector arranged at the first production main valve of the oil production tree, wherein the first magnetic signal detector determines the position of the tool string by sensing the magnetic signal emitted by the magnetic signal generator. The present invention uses the first magnetic signal detector to detect the magnetic signal emitted by the magnetic signal generator to determine the position of the tool string, and then judges whether the first production main valve can be closed for pressure relief, thereby solving the wellhead stuck drill accident, and there is no need to directly close the first production main valve to test the position of the tool string, thereby improving the accident handling efficiency and thus improving the production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field dynamic monitoring, and in particular to a tool string positioning device. Background Art

[0002] During the development of oil and gas fields, it is necessary to clean the wellbore, test it, and do well testing to ensure that the wellbore is unobstructed, obtain important information such as formation data and production parameters, ensure the normal production of oil and gas wells, and guide the next production adjustment of the oil and gas field. In the actual work process, due to the complex production conditions of oil and gas wells and accidents such as wellhead stuck drill, the oil and gas wells cannot produce normally.

[0003] When the drill string is stuck at the wellhead, the winch depth data is inaccurate and the specific location of the tool string cannot be determined. Usually, the on-site staff will test the location of the tool string by closing the first production main valve of the oil tree. If the tool string is exactly at the first production main valve, the first production main valve will be closed to about one-third and cannot be closed further; if the entire tool string is already above the first production main valve, the number of valve closures will exceed two-thirds, and the first production valve can be closed at this time to relieve pressure and release the stuck drill string.

[0004] However, when closing the first production main valve to test the position of the tool string, if there is a steel wire for lifting the tool string at the first production main valve, when the valve is closed more than two-thirds, the valve plate can easily cut the steel wire, causing the tool string to fall into the well. Closing the first production valve cannot be used to relieve pressure and unblock the tool string, and a secondary accident of the tool string falling into the well may occur, affecting production efficiency. Summary of the invention

[0005] The present invention provides a tool string positioning device to solve the technical problem that when closing the first production main valve to test the tool string position, the steel wire is easily cut, causing the tool string to fall into the well, aggravating the accident, and being unable to release pressure to solve the wellhead drill stuck accident.

[0006] The present invention provides a tool string positioning device, which comprises a magnetic signal generator arranged at the bottom end of the tool string and a first magnetic signal detector arranged at the first production main valve of the oil tree. The first magnetic signal detector determines the position of the tool string by sensing the magnetic signal emitted by the magnetic signal generator.

[0007] The tool string positioning device as described above, wherein the first magnetic signal detector includes a first coil mounted on the first production main valve and a first current detector electrically connected to the first coil, the first coil senses the magnetic signal emitted by the magnetic signal generator and generates a current, and the first current detector determines the position of the tool string based on the current generated by the first coil.

[0008] In the tool string positioning device as described above, the first coil includes a sleeve and a wire spirally wound along the outer side of the sleeve.

[0009] In the tool string positioning device as described above, the first coil includes a fixing belt and a wire arranged on the fixing belt, one end of the wire is provided with a plug, and the other end of the wire is provided with a socket electrically connected to the plug.

[0010] In the tool string positioning device as described above, the magnetic signal generator comprises a magnet and a tool string connecting portion fixedly connected to the magnet.

[0011] The tool string positioning device as described above, wherein the tool string connecting portion is a stud.

[0012] The tool string positioning device as described above further comprises a second magnetic signal detector, and the second magnetic signal detector is arranged on a second production valve of the Christmas tree.

[0013] The tool string positioning device as described above, wherein the second magnetic signal detector includes a second coil and a second current detector electrically connected to the second coil, the second coil senses the magnetic signal emitted by the magnetic signal generator and generates a current, and the second current detector determines the position of the tool string by detecting the current generated by the second coil.

[0014] The tool string positioning device as described above further comprises a third magnetic signal detector, and the third magnetic signal detector is arranged on a test valve of the Christmas tree.

[0015] The tool string positioning device as described above further comprises a fourth magnetic signal detector, and the fourth magnetic signal detector is arranged on the lubricant preventer of the Christmas tree.

[0016] The tool string positioning device of the present invention utilizes the first magnetic signal detector to detect the magnetic signal emitted by the magnetic signal generator to determine the position of the tool string, and then judges whether the first production main valve can be closed to release pressure, thereby solving the wellhead drill stuck accident. There is no need to directly close the first production main valve to test the position of the tool string, which improves the accident handling efficiency and thus improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the embodiments of the present invention will become more easily understood through the following detailed description with reference to the accompanying drawings, in which several embodiments of the present invention will be described by way of example and not limitation, wherein:

[0018] Figure 1 This is a schematic diagram of the structure of a tool string positioning device according to a first embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the tool string positioning device embodiment 1 of the present invention when in use;

[0020] Figure 3 It is a structural schematic diagram of an embodiment of a first magnetic signal detector of a tool string positioning device of the present invention;

[0021] Figure 4 It is a structural schematic diagram of another embodiment of the first magnetic signal detector of the tool string positioning device of the present invention;

[0022] Figure 5 It is a structural schematic diagram of a magnetic signal generator of a tool string positioning device of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the second embodiment of the tool string positioning device of the present invention.

[0024] Description of reference numerals:

[0025] 10: magnetic signal generator; 11: magnet;

[0026] 12: tool string connection part; 20: first magnetic signal detector;

[0027] 21: first coil; 211: sleeve;

[0028] 212: wire; 213: fixing belt;

[0029] 214: first laminating portion; 215: second laminating portion;

[0030] 22: a first current detector;

[0031] 30: tool string; 31: steel wire;

[0032] 40: Christmas tree; 41: First production main valve;

[0033] 42: Second production valve; 43: Test valve;

[0034] 44: blowout preventer; 50: testing instrument;

[0035] 51: test cable; 52: test vehicle;

[0036] 60: oil pipe; 70: second magnetic signal detector;

[0037] 80: a third magnetic signal detector; 90: a fourth magnetic signal detector;

[0038] A: plug; B: plug; C: plug; D: plug;

[0039] a: jack; b: jack; c: jack; d: jack. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0041] Figure 1 This is a schematic diagram of the structure of the tool string positioning device embodiment 1 of the present invention, referring to Figure 1 An embodiment of the present invention provides a tool string positioning device, including a magnetic signal generator 10 arranged at the bottom of a tool string 30 and a first magnetic signal detector 20 arranged at a first production main valve 41 of an oil production tree 40. The first magnetic signal detector 20 determines the position of the tool string 30 by sensing the magnetic signal emitted by the magnetic signal generator 10.

[0042] Specifically, the magnetic signal generator 10 is disposed at the bottom end of the tool string 30, and can be threadedly connected to the tool string 30, for example, a threaded hole is disposed on the magnetic signal generator 10, and a stud is disposed at the bottom end of the tool string 30; or, the magnetic signal generator 10 is snap-connected to the tool string 30. The magnetic signal generator 10 is used to emit a magnetic signal, and can be an electromagnet, or a magnet such as a neodymium iron boron magnet, an aluminum nickel cobalt magnet, or the like.

[0043] The first magnetic signal detector 20 can be fixed on the first production main valve 41 of the Christmas tree 40 by threaded connection or clamping, or the first magnetic signal detector 20 can also be tied to the first production main valve 41 with a rope. The first magnetic signal detector 20 can sense the magnetic signal emitted by the magnetic signal generator 10, and then determine the relative position of the tool string 30 and the first production main valve 41 according to the magnetic signal. The first magnetic signal detector 20 can be an existing instrument for detecting magnetic signals, or other instruments that can convert magnetic signals into other signals for display. For example, using the principle of electromagnetic induction, the first magnetic signal detection instrument 20 can include a coil and an ammeter electrically connected to the coil. The vertically spirally wound coil is sleeved on the first production main valve 41. The relative position of the magnetic signal generator 10 and the first production main valve 41 is determined according to the current size and direction displayed on the ammeter, that is, the relative position of the tool string and the first production main valve 41 is determined.

[0044] When the first magnetic signal detector 20 detects the magnetic signal emitted by the magnetic signal generator 10, it determines the position of the tool string 30 and judges whether the tool string 30 passes through the first production main valve 41. After a drill stuck or top drilling accident occurs, it is not necessary to close the first production main valve 41 to test the position of the tool string 30. According to the detection result of the first magnetic signal detector 20, it is determined whether the tool string 30 passes through the first production main valve 41. After the tool string 30 passes through the first production main valve 41, the first production main valve 41 is closed to perform pressure relief work, and the wellhead drill stuck accident is quickly resolved, which improves the timeliness and accuracy of accident handling, improves the safety of oil and gas production, and also improves production efficiency; at the same time, it can also prevent the tool string 30 from falling into the well, reduce the risk of well control, and ensure construction safety.

[0045] Figure 2 This is a schematic diagram of the structure of the tool string positioning device embodiment 1 of the present invention when in use. Figure 2 , taking the wellbore testing work as an example, the working principle and process of the tool string positioning device according to the embodiment of the present invention are further explained.

[0046] In the process of oil and gas field development, in order to understand the laws of oil and gas layers and ensure the normal production of oil and gas wells, the wellbore is usually tested. Figure 2 The test instrument 50 is lowered to the bottom of the oil pipe 60 through the steel wire 31, and the test data is transmitted to the test vehicle 52 on the ground through the test cable 51. The test personnel analyze and process the test data to obtain data such as oil and gas layer production, pressure, and liquid production properties.

[0047] After a drill bit stuck accident occurs during the test work, although the test instrument 50 can still be lifted up, the specific depth is inaccurate due to the twisting of the steel wire, and it is very likely to be stuck at the wellhead Christmas tree 40, making it impossible for the test instrument 50 to be lifted up from the wellhead. At this time, the on-site test personnel usually close the first production main valve 41 to test the specific position of the test instrument 50. If the test instrument 50 is at the first production main valve at this time, the first production main valve 41 cannot be closed after being closed by about one-third, and then the first production main valve 41 is opened to lift the test instrument 50; if the steel wire is at the first production main valve 41 at this time, the first production main valve 41 is opened again to continue to pull upwards, and then the first production main valve 41 is closed again to test until the test instrument 50 passes through the first production main valve 41. The process of testing the position of the test instrument 50 is long, and the efficiency of handling accidents is low. Moreover, when closing the first production main valve 41, if the steel wire is at the first production main valve 41, it is very likely to cut the steel wire, causing the test instrument 50 to fall into the well, aggravating the accident.

[0048] To this end, an embodiment of the present invention provides a tool string positioning device to determine the position of the test instrument 50 at the wellhead oil production tree 40. Specifically, the magnetic signal generator 10 is arranged at the bottom of the test instrument 50 to emit a magnetic signal. The first magnetic signal detector 20 is arranged on the first production main valve 41, and the first magnetic signal detector 20 determines the position of the test instrument 50 at the wellhead oil production tree 40 according to the sensed magnetic signal, that is, determines the relative position of the test instrument 50 and the first production main valve 41. When the first magnetic signal detector 20 determines that the test instrument 50 passes through the first production main valve 41, the first production main valve 41 is closed, and subsequent work such as pressure relief is performed to solve the drill stuck accident and improve production efficiency.

[0049] It is understandable that the tool string positioning device provided in the embodiment of the present invention can also be used in other wellbore operations, such as wax cleaning work, in which case the tool string 30 is a wax cleaning tool such as a wax scraper; another example is well testing work, in which case the tool string 30 is a well testing tool.

[0050] The tool string positioning device provided in the embodiment of the present invention utilizes a first magnetic signal detector to detect the magnetic signal emitted by a magnetic signal generator to determine the position of the tool string, and then judges whether the first production main valve can be closed to release pressure to solve the drill sticking accident. There is no need to directly close the first production main valve to test the position of the tool string, which improves the efficiency of accident handling and thus improves production efficiency.

[0051] Figure 3 It is a structural schematic diagram of an embodiment of a first magnetic signal detector of a tool string positioning device of the present invention; Figure 4 It is a structural schematic diagram of another embodiment of the first magnetic signal detector of the tool string positioning device of the present invention.

[0052] As a preferred embodiment, the relative position of the tool string 30 and the first production main valve 41 is determined by using the principle of electromagnetic induction.

[0053] Reference Figure 3 and Figure 4 The first magnetic signal detector 20 includes a first coil 21 mounted on the first production main valve 41 and a first current detector 22 electrically connected to the first coil 21. The first coil 21 senses the magnetic signal emitted by the magnetic signal generator 10 and generates current. The first current detector 22 determines the position of the tool string 30 according to the current generated by the first coil 21.

[0054] In the process of lifting the tool string 30, the magnetic signal generator 10 at the bottom of the tool string 30 moves upward with the tool string 30, and the magnetic signal sensed by the first coil 21 gradually increases. When the magnetic signal generator 10 reaches the middle of the first coil 21 at a certain speed, the current detected by the first current detector 22 is the largest; continue to lift the tool string 30, the magnetic signal generator 10 moves upward away from the first coil 21, and the current detected by the first current detector 22 is reversed, indicating that the tool string 30 has passed the first production main valve 41, and the first production main valve 41 can be closed to perform subsequent work such as pressure relief.

[0055] It is understandable that, in actual use, the first magnetic signal detector 20 at the first production main valve 41 can be moved up and down, and the position of the tool string can be determined by the current of the first current detector 22 .

[0056] The first coil 21 can have various structures:

[0057] The first structure: the first coil 21 is directly wound around the first production main valve 41 .

[0058] The second structure: reference Figure 3 The first coil 21 includes a sleeve 211 and a wire 212 spirally wound along the outer side of the sleeve 211. In order not to affect the magnetic signal, the sleeve 211 is preferably a non-metallic sleeve, such as a plastic sleeve. The number of turns of the wire 212 wound around the sleeve 211 can be designed according to actual conditions, and the embodiment of the present invention does not limit this. One end of the wire 212 is connected to one end of the first current detector 22, and the other end of the wire 212 is connected to the other end of the first current detector 22 after being wound around the sleeve 211 for a preset number of turns.

[0059] The third structure: reference Figure 4 The first coil 21 includes a fixing belt 213 and a wire 212 arranged on the fixing belt 213, a plug is arranged at one end of the wire 212, and a socket electrically connected to the plug is arranged at the other end of the wire 212. Specifically, the fixing belt 213 can be a soft cloth belt, or other bendable fixing belt. The fixing belt 213 can be rectangular, and the wire 212 is inserted into the fixing belt 213. Preferably, a first fitting portion 214 is arranged at one end of the fixing belt 213, and a second fitting portion 215 is arranged at the other end of the fixing belt 213. The first fitting portion 214 and the second fitting portion 215 can be a side of Velcro with soft hair and a side with harder barbs, respectively; or, the first fitting portion 214 and the second fitting portion 215 can also be adhesive tapes provided with adhesive, which is not limited in the present invention. Preferably, there are multiple wires 212, and the wires 212 are arranged along the length direction of the rectangular fixing belt, and the multiple wires are arranged at intervals along the width direction of the rectangular fixing belt. The embodiment of the present invention does not limit the number of wires 212. One end of each wire 212 is a plug, and the other end is a socket. Figure 4 For example, for the purpose of description, the wires are No. 1 wire, No. 2 wire, No. 3 wire, and No. 8 wire from top to bottom. The jack of No. 1 wire is connected to one end of the first current detector 22 through a wire, the plug A of No. 1 wire is connected to the jack a of No. 2 wire, the plug B of No. 2 wire is connected to the jack b of No. 3 wire, the plug C of No. 3 wire is connected to the jack c of No. 4 wire, and the plug D of No. 7 wire is connected to the jack d of No. 8 wire, and so on, a spiral coil is formed. The plug of No. 8 wire is connected to the other end of the first current detector 22 through a wire. It should be noted that in actual applications, the number of wires 212 can be designed according to actual conditions. In specific use, the first fitting portion 214 and the second fitting portion 215 are fitted together, and the fixing belt 213 forms a cylindrical structure, which is sleeved on the first production main valve 41, and at this time, the plug of the wire matches the jack one by one to form a coil.

[0060] As a preferred embodiment, the first current detector 22 can be an ammeter. When the magnetic signal generator 10 is lifted up along with the tool string, the first coil generates current according to the principle of electromagnetic induction, and the ammeter deflects. When the magnetic signal generator 10 reaches the middle of the first coil 21 at a certain speed, the current generated is the largest, and the ammeter deflects the largest; when the magnetic signal generator 10 passes through the middle of the first coil 21, the ammeter begins to deflect in the opposite direction, and at this time the tool string has passed through the first production main valve 41, and the operator can close the first production main valve 41 and perform subsequent work such as pressure relief.

[0061] Figure 5 Schematic diagram of the structure of the magnetic signal generator of the tool string positioning device of the present invention. Figure 5 , the magnetic signal generator 10 includes a magnet 11 and a tool string connection part 12 fixedly connected to the magnet 11. The magnet can be a magnet of various materials, which is not limited in the embodiment of the present invention. Preferably, the tool string connection part 12 is threadedly connected to the tool string 30, which is reliable and easy to process. The tool string connection part 12 can be a threaded hole, which is threadedly connected to a stud set at the bottom end of the tool string 30; or the tool string connection part 12 is a stud, which is threadedly connected to a threaded hole set at the bottom end of the tool string 30.

[0062] Figure 6 This is a schematic diagram of the structure of the second embodiment of the tool string positioning device of the present invention. Figure 6 The tool string positioning device provided in the embodiment of the present invention further includes a second magnetic signal detector 70 , which is disposed on the second production valve 42 of the Christmas tree 40 .

[0063] The second magnetic signal detector 70 includes a second coil and a second current detector electrically connected to the second coil. The second coil senses the magnetic signal emitted by the magnetic signal generator and generates current. The second current detector determines the position of the tool string by detecting the current generated by the second coil.

[0064] In the process of lifting the tool string 30, the magnetic signal generator 10 at the bottom of the tool string 30 moves upward with the tool string 30, and the magnetic signal sensed by the second coil gradually increases. When the magnetic signal generator 10 reaches the middle of the second coil at a certain speed, the current detected by the second current detector is the largest; continue to lift the tool string 30, the magnetic signal generator 10 moves upward away from the second coil, and the current detected by the second current detector is reversed, indicating that the tool string 30 has passed the second production main valve 42, and the second production main valve 42 can be closed to perform subsequent work such as pressure relief.

[0065] It is understood that the structure, function and effect of the second coil are the same as those of the first coil, and the details can be referred to the above embodiment, which will not be described in detail here. The structure, function and effect of the second current detector are the same as those of the first current detector, and the details can be referred to the above embodiment, which will not be described in detail here.

[0066] The embodiment of the present invention sets a second magnetic signal detector at the second production main valve to determine the relative position of the tool string with respect to the second production main valve, and determines whether to close the second production main valve for pressure relief, thereby quickly resolving wellhead stuck drill accidents and improving accident handling efficiency.

[0067] Further, continue to refer to Figure 6 The tool string positioning device provided in the embodiment of the present invention further includes a third magnetic signal detector 80, which is disposed on the test valve 43 of the Christmas tree 40. The structure, function and effect of the third magnetic signal detector 80 are the same as those of the first magnetic signal detector, and the details can be referred to the above embodiment, which will not be described again.

[0068] The embodiment of the present invention sets a third magnetic signal detector at the test valve to determine the relative position of the tool string with respect to the test valve, determines whether to close the test valve for pressure relief, and quickly resolves the wellhead stuck drill accident, thereby improving the accident handling efficiency.

[0069] Further, refer to Figure 6 The tool string positioning device provided in the embodiment of the present invention further includes a fourth magnetic signal detector 90 , which is disposed on the lubricant preventer 44 of the Christmas tree 40 .

[0070] It can be understood that the structure, function and effect of the fourth magnetic signal detector 90 are the same as those of the first magnetic signal detector. For details, please refer to the above embodiment and will not be described again.

[0071] The embodiment of the present invention sets a fourth magnetic signal detector at the lubricant to determine the position of the tool string relative to the lubricant pressure relief valve, determines whether to close the lubricant pressure relief valve for pressure relief, and quickly resolves the wellhead stuck drill accident, thereby improving the accident handling efficiency.

[0072] It is understandable that the tool string positioning device provided in the embodiment of the present invention may further include a fifth magnetic signal detector, which is installed on the wax removal valve to determine the relative position of the tool string and the wax removal valve, and determine whether to close the wax removal valve for pressure relief. The structure, function and effect of the fifth magnetic signal detector are the same as those of the first magnetic signal detector, and the details can be referred to the above embodiment, which will not be repeated here.

[0073] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0074] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tool string positioning device, characterized in that: It comprises a magnetic signal generator arranged at the bottom of the tool string, a first magnetic signal detector, a second magnetic signal detector, a third magnetic signal detector, a fourth magnetic signal detector and a fifth magnetic signal detector arranged at the first production main valve of the oil production tree, wherein the first magnetic signal detector determines the position of the tool string by sensing the magnetic signal emitted by the magnetic signal generator, and the first production main valve is used to close and release pressure when the first magnetic signal detector determines that the tool string passes through the first production main valve; The first magnetic signal detector includes a first coil sleeved on the first production main valve and a first current detector electrically connected to the first coil, the first coil senses the magnetic signal emitted by the magnetic signal generator and generates a current, and the first current detector determines the position of the tool string according to the current generated by the first coil; The process of the first magnetic signal detector determining that the tool string passes through the first production main valve is as follows: in the process of lifting the tool string, the magnetic signal generator at the bottom of the tool string moves upward along with the tool string, and the magnetic signal sensed by the first coil gradually increases. When the magnetic signal generator reaches the middle of the first coil, the current detected by the first current detector is the maximum. The tool string continues to be lifted, the magnetic signal generator moves upward away from the first coil, and the current detected by the first current detector is reversed, and it is determined that the tool string passes through the first production main valve. The first coil includes a sleeve and a wire spirally wound along the outer side of the sleeve; The first coil includes a fixing belt and a wire arranged on the fixing belt, one end of the wire is provided with a plug, and the other end of the wire is provided with a socket electrically connected to the plug; The magnetic signal generator includes a magnet and a tool string connection portion fixedly connected to the magnet; The tool string connection portion is a stud; The second magnetic signal detector is arranged on the second production valve of the Christmas tree; The second magnetic signal detector includes a second coil and a second current detector electrically connected to the second coil, the second coil senses the magnetic signal emitted by the magnetic signal generator and generates a current, and the second current detector determines the position of the tool string by detecting the current generated by the second coil; The third magnetic signal detector is arranged on the test valve of the Christmas tree; The fourth magnetic signal detector is arranged on the blowout preventer of the Christmas tree; The fifth magnetic signal detector is installed on the wax cleaning valve.

Images