Method and related equipment for quickly positioning piercing-through position of drilling tool

Abstract

The invention provides a method and related equipment for rapidly positioning the piercing position of a drilling tool, calcium carbide (the main component CaC2) is put into a wellhead drilling tool, the calcium carbide reacts with water in the drilling fluid to generate acetylene gas (CaC2 + 2H2O = Ca (OH) 2 + C2H2), the acetylene gas moves downwards along with the drilling fluid in the drilling tool, a part of acetylene gas is pierced out from the piercing position of the drilling tool to enter a shaft annulus, and the drilling tool is driven by the drilling tool to pierce the drilling tool. The other part of acetylene gas moves downwards to a drill bit along with the drilling fluid to enter a shaft annulus and returns to the ground along with the drilling fluid, the two parts of acetylene gas return to the ground in different time sequences, are degassed by a degasser and then are respectively detected by a comprehensive logging instrument chromatography, and when other engineering parameters are insufficient to judge whether the drilling tool is punctured or not, the drilling tool punctured leakage can be quickly verified; the time difference of acetylene gas detection is combined with engineering logging parameters for calculation, so that the piercing-through position of the drilling tool can be obtained, and the detection method is high in accuracy and detection efficiency.

Description

Technical Field

[0001] The invention belongs to the field of mud logging, and in particular relates to a method for quickly locating a drilling tool leakage position and related equipment. Background Art

[0002] In the field of oil and gas drilling, engineering parameter logging is an important component of logging technical information services. Its main function is to provide services for safe drilling and optimized drilling, among which the early detection and prediction of drilling tool accidents are particularly important. With the increase of drilling tool use time, the engineering risk of drilling tool accidents due to downhole drilling tool fatigue increases, and drilling tool leakage is particularly prone to occur. If it is not discovered in time or ignored and drilling continues, the risk of drilling tool breakage will be greatly increased under the action of drilling tool torque. If drilling tool leakage cannot be discovered in time, the high-pressure drilling fluid jet generated at the drilling tool leakage will destroy the mud cake that has been formed on the well wall, thereby destroying the stability of the well wall and increasing the risks of engineering complications such as well wall collapse and drill stuck.

[0003] The existing technology generally uses colored plastic sheets, diesel and other indicators for observation and the "brown rope knot" method. These methods require that the drilling tool has holes or seams that are large enough to pass the indicators, which has a high risk of judgment failure. Even if it is found, it wastes a lot of precious time, indirectly increasing the risk of drilling tool accidents. In terms of locating the drilling leak, the method of observing indicators often has large errors due to human factors and is not accurate enough. Summary of the invention

[0004] The invention provides a method for quickly locating the position of a drilling tool puncture leakage and related equipment, which solves the problem of large human factor error and insufficient accuracy when detecting drilling tool puncture leakage in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for quickly locating a drilling tool leakage position, comprising:

[0007] Get the theoretical delay time of acetylene gas after the wellhead drilling tool is put into calcium carbide;

[0008] Get the actual delay time and actual delay times of acetylene gas when the drilling tool is going down;

[0009] The drilling tool puncture leakage position is obtained according to the theoretical delay time, actual delay time, actual delay times and the drilling tool down time.

[0010] Preferably, the theoretical delayed time of the acetylene gas is the time it takes for the acetylene gas to go down with the drilling fluid, pass through the drill bit, and return to the ground with the drilling fluid.

[0011] Preferably, the calculation method of the theoretical late time is:

[0012]

[0013] Among them, T 理 is the theoretical delay time, V is the volume of the wellbore annular space, Q is the displacement of the drilling fluid pump, D is the wellbore diameter, d is the outer diameter of the drill pipe, and H is the well depth.

[0014] Preferably, the acetylene gas is returned to the ground and then degassed by a degasser before entering into a comprehensive logging instrument for chromatographic detection.

[0015] Preferably, the actual number of late arrivals of acetylene gas is used to determine the number of puncture leaks.

[0016] Preferably, the actual number of late arrivals and the actual late arrival time correspond one to one.

[0017] Preferably, the method for calculating the drilling tool leakage position according to the theoretical late time, the actual late time, the actual number of late times and the down time of the drilling tool is:

[0018]

[0019] Among them, ΔH is the distance between the drilling tool leakage point and the drill bit (m), ΔT is the time difference between the actual delay time and the theoretical delay time, Q is the displacement of the drilling fluid pump, D is the wellbore diameter; d is the outer diameter of the drill pipe, and d1 is the inner diameter of the drill pipe.

[0020] A system for quickly locating a drilling tool leakage position, comprising:

[0021] Theoretical acquisition module: used to obtain the theoretical delay time of acetylene gas after the wellhead drilling tool is put into calcium carbide;

[0022] Actual acquisition module: used to obtain the actual delay time and actual delay times of acetylene gas when the drilling tool is descending;

[0023] The module for obtaining the puncture leakage position is used to obtain the drilling tool puncture leakage position according to the theoretical late arrival time, the actual late arrival time, the actual number of late arrivals and the drilling tool's down time.

[0024] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of a method for rapidly locating a drilling tool leakage position are implemented.

[0025] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of a method for quickly locating a drilling tool leakage position are implemented.

[0026] Compared with the prior art, the present invention has the following beneficial effects: the present invention provides a method for quickly locating the position of a drill tool leakage, wherein calcium carbide (main component CaC2) is put into the wellhead drill tool, and the calcium carbide reacts with water in the drilling fluid to produce acetylene gas (CaC2+2H2O=Ca(OH)2+C2H2), and as the drilling fluid in the drill tool descends, a part of the acetylene gas pierces out from the drill tool leakage position and enters the wellbore annulus, and another part of the gas descends with the drilling fluid to the drill bit and enters the wellbore annulus, and returns to the ground with the drilling fluid. The two parts of acetylene gas return to the ground at different times, and are respectively detected by the comprehensive logging instrument chromatogram after being degassed by the degasser. When other engineering parameters are insufficient to determine whether a drill tool leakage occurs, the drill tool leakage can be quickly verified; the drill tool leakage position can be obtained by combining the time difference of detecting the acetylene gas with the engineering logging parameters for calculation, and such a detection method has high accuracy and high detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A flow chart of a method for quickly locating a drilling tool leakage position according to the present invention;

[0028] Figure 2 A system block diagram for quickly locating a drilling tool leakage position according to the present invention;

[0029] Figure 3 This is a graph showing the real-time analysis of the chromatography of the mud logging instrument according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figure 1 The present invention provides a method for quickly locating a drilling tool leakage position, comprising:

[0037] S101 obtains the theoretical delayed time of acetylene gas after calcium carbide is put into the wellhead drilling tool;

[0038] S102 obtains the actual delay time and actual delay times of acetylene gas when the drilling tool is descending;

[0039] S103 obtains the drilling tool leakage position according to the theoretical delay time, the actual delay time, the actual delay times and the drilling tool's descending time.

[0040] Calcium carbide (main component CaC2) is put into the wellhead drill bit. Calcium carbide reacts with water in the drilling fluid to produce acetylene gas (CaC2+2H2O=Ca(OH)2+C2H2). As the drilling fluid in the drill bit goes down, part of the acetylene gas pierces out from the drill bit leakage point and enters the wellbore annulus, while the other part of the gas goes down with the drilling fluid to the drill bit and enters the wellbore annulus and returns to the ground with the drilling fluid. The two parts of acetylene gas return to the ground at different times. After being degassed by the degasser, they are detected by the comprehensive logging instrument chromatogram. When other engineering parameters are not sufficient to determine whether the drill bit leakage occurs, the drill bit leakage can be quickly verified.

[0041] The theoretical delay time of acetylene gas is the time it takes for acetylene gas to go down with the drilling fluid, pass through the drill bit, and return to the ground with the drilling fluid.

[0042] The theoretical late arrival time can be directly calculated from the wellbore related data.

[0043] The calculation method of theoretical lateness time is:

[0044]

[0045] Among them, T 理 is the theoretical delay time, V is the volume of the wellbore annular space, Q is the displacement of the drilling fluid pump, D is the wellbore diameter, d is the outer diameter of the drill pipe, and H is the well depth.

[0046] After returning to the ground, the acetylene gas is degassed by the degasser and then enters the comprehensive logging instrument chromatographic detection.

[0047] Degasser and integrated logging instrument chromatograph are necessary equipment for drilling, and no other additional equipment is needed.

[0048] The actual number of acetylene gas delays is used to determine the number of puncture leaks.

[0049] When the actual number of acetylene gas delays is greater than 1, it indicates a leak.

[0050] The actual number of late arrivals and the actual late arrival time correspond one to one.

[0051] The calculation method for obtaining the drilling tool leakage position based on the theoretical delay time, actual delay time, actual delay times and drilling tool down time is:

[0052]

[0053] Among them, ΔH is the distance between the drilling tool leakage point and the drill bit (m), ΔT is the time difference between the actual delay time and the theoretical delay time, Q is the displacement of the drilling fluid pump, D is the wellbore diameter; d is the outer diameter of the drill pipe, and d1 is the inner diameter of the drill pipe.

[0054] Another embodiment of the present invention provides a method for quickly locating a drilling tool leakage position:

[0055] Prior to the development of this patent, there were three main methods for quickly determining the location of a puncture leak based on existing materials, equipment and information: 1) using colored plastic sheets and other indicators to be dropped from the wellhead, and as the drilling fluid in the drill tool descends, it will puncture the leak at the drill tool and return to the ground, and the location of the drill tool puncture leak is calculated by observing the time interval for the colored plastic sheets to return to the ground; 2) using a "brown rope knot" to be dropped from the wellhead, and as the drilling fluid in the drill tool descends to the leak at the drill tool, the location of the drill tool puncture leak is calculated by detecting the time it takes for the pump pressure to rise and the pump stroke to drop; 3) developing special equipment and establishing a hydrodynamic model to locate the drilling leak.

[0056] Aiming at determining the location of drilling tool leakage, a method for quickly determining the drilling tool leakage location information based on gas logging technology and engineering parameter logging technology is proposed.

[0057] (1) Method for judging drilling tool leakage: The principle of calcium carbide measurement of late arrival time is as follows: calcium carbide (main component is CaC2) is put into the wellhead drilling tool. Calcium carbide reacts with water in the drilling fluid to produce acetylene gas (CaC2+2H2O=Ca(OH)2+C2H2), which flows downward with the drilling fluid, passes through the drill bit and returns to the ground with the drilling fluid. After being degassed by the degasser, it enters the comprehensive logging instrument chromatogram, which is manifested as an abnormally high peak value of the gas measurement component C2, while other components remain almost unchanged. This is determined as a cycle time, and the late arrival time at the drill bit is deducted from the downward time.

[0058] If the wellbore is regarded as a cylinder with different diameters, the theoretical delay time is:

[0059]

[0060] Where:

[0061] T 理 —Theoretical late time (min);

[0062] V—wellbore annular space volume (m 3 );

[0063] Q—Drilling fluid pump displacement (m 3 / min);

[0064] D—wellbore diameter (m);

[0065] d—drill pipe outer diameter (m);

[0066] H—well depth (m).

[0067] (2) Method for judging drilling tool leakage: If the drilling tool is leaking, part of the acetylene gas will be discharged from the drilling tool leakage point and returned to the ground along with the drilling fluid, while another part of the gas will go down with the drilling fluid to the drill bit and return to the ground along with the drilling fluid. After degassing by the degasser, the gas will enter the chromatogram of the integrated logging instrument. The chromatogram will detect acetylene gas coming from the drilling tool leakage point and the drill bit twice. This phenomenon can be used to judge the drilling tool leakage.

[0068] (3) Method for quickly locating the position of the drill bit leak: When the drill bit leaks, the acetylene gas generated by the calcium carbide put into the wellhead drill bit will flow down with the drilling fluid to the drill bit leaking place. Part of the acetylene gas will flow out from the drill bit leaking place and enter the wellbore annulus. Another part of the gas will flow down with the drilling fluid to the drill bit and enter the wellbore annulus. It will return to the ground with the drilling fluid, and after being degassed by the degasser, it will enter the comprehensive logging instrument chromatogram. The acetylene gas returned from the drill bit leaking place will be detected by the comprehensive logging instrument chromatogram before the acetylene gas returned from the drill bit. The time difference between the two acetylene gas detections and the engineering logging parameters can be combined to calculate the position of the drill bit leaking place. The calculation formula is:

[0069]

[0070] Where:

[0071] ΔH—the distance between the drilling tool leakage point and the drill bit (m);

[0072] ΔT—the absolute value of the time difference between two detections of acetylene gas (min);

[0073] Q—Drilling fluid pump displacement (m 3 / min);

[0074] D—wellbore diameter (m);

[0075] d—drill pipe outer diameter (m);

[0076] d1—inner diameter of drill pipe (m).

[0077] After the implementation of this technology, the occurrence of drill string leakage is determined by detecting acetylene gas twice after one injection of calcium carbide. The time difference between the two acetylene gas detections is combined with the engineering logging parameters for calculation. Part of the acetylene gas is emitted from the drill string leakage point and returned to the ground along with the drilling fluid, while another part of the gas goes down with the drilling fluid to the drill bit and returns to the ground along with the drilling fluid. After degassing in the degasser, it enters the chromatogram of the integrated logging instrument. The chromatogram detects acetylene gas returning from the drill string leakage point and the drill bit twice. This phenomenon can be used to determine the drill string leakage and obtain the location of the drill string leakage.

[0078] Specific applications:

[0079] A well case

[0080] A well was drilled to a depth of 3868m. The pump pressure slowly dropped from 13.8MPa to 13.3MPa, and the pump stroke slowly dropped from 148str / min to 145str / min. Then the pump pressure and pump stroke slowly stabilized. The logging operator judged that the drill string was leaking. The drilling team conducted a comprehensive analysis and believed that there was a problem with the pump's water supply efficiency. The drilling string leak prediction result proposed by the logging team was not adopted. In order to verify whether the drill string was leaking, the logging team put calcium carbide into the wellhead drill string. Two C2 peaks appeared on the chromatogram real-time analysis chart ( Figure 3 ), verified the prediction result of drilling tool leakage, and found that the C2 peak time difference was 9 minutes between the two detections. The drilling tool leakage position was calculated to be about 298m away from the drill bit based on the calculation formula and the real-time engineering parameters.

[0081] Calculation formula and parameters:

[0082]

[0083] Where:

[0084] ΔT—The time difference between two detections of acetylene gas is 9 minutes;

[0085] Q—Drilling fluid pump displacement 2.75m3 / min;

[0086] D—wellbore diameter 0.3333m, the value is the drill bit diameter 0.3333m;

[0087] d—drill pipe outer diameter 0.1492m;

[0088] d1—drill pipe inner diameter 0.1299m;

[0089] ΔH—The distance between the drilling tool leakage point and the drill bit is 298m.

[0090] The drilling team adopted the judgment and suggestions of the logging team, pulled out the drill to check the drilling tools, and found a 3.5cm×1.0cm crack in the ordinary drill pipe body 307m away from the drill bit. The patented method was used to accurately determine the drilling tool puncture leakage. The located drilling tool puncture leakage position was 9m different from the measured data, and the error was less than the length of one drill pipe (9.60m), with high accuracy. The application of this patented method successfully reduced the risk of major drilling engineering accidents and major losses in the Wulu 1 well.

[0091] The present invention also provides a system for quickly locating a drilling tool leakage position, comprising:

[0092] Theoretical acquisition module: obtains the theoretical delay time of acetylene gas after the wellhead drilling tool is put into calcium carbide;

[0093] Actual acquisition module: obtains the actual delay time and actual delay times of acetylene gas when the drilling tool is descending;

[0094] The module for obtaining the puncture leakage position is used to obtain the drilling tool puncture leakage position according to the theoretical late arrival time, the actual late arrival time, the actual number of late arrivals and the drilling tool's down time.

[0095] A terminal device is provided in one embodiment of the present invention. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0096] The computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to accomplish the present invention.

[0097] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0098] The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0099] The memory may be used to store the computer program and / or module, and the processor implements various functions of the terminal device by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory.

[0100] If the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0101] Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields, and the above-mentioned specific embodiments are only illustrative and instructive, rather than restrictive. Under the guidance of the specification, a person skilled in the art can also make many forms without departing from the scope of protection of the claims of the present invention, all of which belong to the scope of protection of the present invention.

Claims

1. A method for quickly locating a drilling tool leakage position, characterized in that: include: Get the theoretical delay time of acetylene gas after the wellhead drilling tool is put into calcium carbide; Get the actual delay time and actual delay times of acetylene gas when the drilling tool is descending; The drilling tool leakage position is obtained according to the theoretical delay time, actual delay time, actual delay times and the drilling tool down time.

2. A method for quickly locating a drilling tool leakage position according to claim 1, characterized in that: The theoretical delayed time of the acetylene gas is the time it takes for the acetylene gas to go down with the drilling fluid, pass through the drill bit, and return to the ground with the drilling fluid.

3. A method for quickly locating a drilling tool leakage position according to claim 1, characterized in that: The calculation method of the theoretical late time is: Among them, T 理 is the theoretical delay time, V is the volume of the wellbore annular space, Q is the displacement of the drilling fluid pump, D is the wellbore diameter, d is the outer diameter of the drill pipe, and H is the well depth.

4. A method for quickly locating a drilling tool leakage position according to claim 1, characterized in that: After returning to the ground, the acetylene gas is degassed by a degasser and then enters the comprehensive logging instrument chromatographic detection.

5. A method for quickly locating a drilling tool leakage position according to claim 1, characterized in that: The actual number of acetylene gas delays is used to determine the number of puncture leaks.

6. A method for quickly locating a drilling tool leakage position according to claim 1, characterized in that: The actual number of late arrivals and the actual late arrival time correspond one to one.

7. A method for quickly locating a drilling tool leakage position according to claim 1, characterized in that: The calculation method for obtaining the drilling tool leakage position based on the theoretical delay time, actual delay time, actual delay times and drilling tool down time is: Among them, ΔH is the distance between the drilling tool leakage point and the drill bit (m), ΔT is the time difference between the actual delay time and the theoretical delay time, Q is the displacement of the drilling fluid pump, D is the wellbore diameter; d is the outer diameter of the drill pipe, and d1 is the inner diameter of the drill pipe.

8. A system for quickly locating the position of a drilling tool puncture leak, characterized in that: include: Theoretical acquisition module: used to obtain the theoretical delay time of acetylene gas after the wellhead drilling tool is put into calcium carbide; Actual acquisition module: used to obtain the actual delay time and actual delay times of acetylene gas when the drilling tool is descending; The module for obtaining the puncture leakage position is used to obtain the drilling tool puncture leakage position according to the theoretical late arrival time, the actual late arrival time, the actual number of late arrivals and the drilling tool's down time.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for quickly locating a drilling tool leakage position as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of a method for quickly locating a drilling tool leakage position as described in any one of claims 1 to 7 are implemented.

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