A method for quickly locating a leak position of a drilling tool and related equipment

Abstract

The application provides a method for quickly positioning a drill tool puncture position and related equipment, and calcium carbide (main component CaC2) is put into a wellhead drill tool, calcium carbide reacts to produce acetylene gas (CaC2+2H2O=Ca(OH)2+C2H2) in the drilling fluid, the acetylene gas goes down with the drilling fluid in the drill tool, part of the acetylene gas is punctured out from the drill tool puncture position and enters a wellbore annulus, another part of the acetylene gas goes down with the drilling fluid to the drill bit and enters the wellbore annulus, and the acetylene gas returns to the ground with the drilling fluid, the two parts of the acetylene gas return to the ground at different times, are detected by a comprehensive logging instrument chromatogram after degassing, and the drill tool puncture can be quickly verified when other engineering parameters are insufficient to determine whether the drill tool puncture occurs; the drill tool puncture position can be obtained by detecting the time difference of the acetylene gas and combining with engineering logging parameters, and the detection method has high accuracy and high detection efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of mud logging, and particularly relates to a method for quickly positioning a drill tool puncture position and related equipment. BACKGROUND

[0002] In the field of oil and gas drilling, engineering parameter mud logging is an important component of mud logging technical information service, and mainly serves safe drilling and optimized drilling, among which early discovery and prediction of drill tool accidents are particularly important; with the increase of drill tool use time, the engineering risk of drill tool accidents caused by drill tool fatigue in the downhole increases, and drill tool puncture is particularly prone to occur; if the drill tool puncture is not discovered in time or ignored to continue drilling, the risk of drill tool fracture under the action of drill tool torsion will greatly increase; if the drill tool puncture cannot be discovered in time, the high-pressure drilling fluid jet generated at the drill tool puncture position will damage the mud cake formed on the well wall, thereby damaging the well wall stability and increasing the risk of well wall collapse, drill sticking and other engineering complications.

[0003] The prior art generally uses color plastic sheets, diesel and other indicators to observe and uses a “brown rope knot” method; these methods require that the drill tool puncture position has a hole or a gap sufficient to pass the indicators, and there is a high risk of judgment failure; even if the drill tool puncture is discovered, a lot of valuable time is wasted, and the risk of drill tool accidents is indirectly increased. In terms of positioning the drill tool puncture position, the method of observing the indicators often has large human error and is not accurate enough. SUMMARY

[0004] The application provides a method for quickly positioning a drill tool puncture position and related equipment, and solves the problem of large human error and low accuracy in detecting the drill tool puncture in the prior art.

[0005] To achieve the above object, the application provides the following technical scheme.

[0006] A method for quickly positioning a drill tool puncture position, comprising the following steps.

[0007] Obtaining a theoretical late arrival time of an ethylene gas after the drill tool is put into the wellhead.

[0008] Obtaining an actual late arrival time and an actual late arrival frequency of the ethylene gas when the drill tool is descending.

[0009] Obtaining the drill tool puncture position according to the theoretical late arrival time, the actual late arrival time and the actual late arrival frequency.

[0010] Preferably, the theoretical late arrival time of the ethylene gas is the time of the ethylene gas descending with the drilling fluid, passing through the drill bit and then returning to the ground with the drilling fluid.

[0011] Preferably, after the ethylene gas returns to the ground, the ethylene gas is degassed by a degasser and then enters a comprehensive mud logging instrument for chromatographic detection.

[0012] Preferably, the actual number of delays of the acetylene gas is used to determine the number of leaks.

[0013] Preferably, the actual number of delays and the actual delay time are one-to-one.

[0014] Preferably, the drill tool leak location calculation method is obtained according to the theoretical delay time, the actual delay time and the actual number of delays.

[0015]

[0016] wherein, H is the distance (m) from the drill tool leak to the drill bit, T is the time difference between the actual delay time and the theoretical delay time, Q is the drilling fluid pump displacement, D is the borehole diameter; d is the outer diameter of the drill pipe, and d1 is the inner diameter of the drill pipe.

[0017] A system for quickly positioning a drill tool leak location, comprising:

[0018] a theoretical acquisition module: configured to acquire the theoretical delay time of acetylene gas after the drill tool is put into calcium carbide at the wellhead;

[0019] an actual acquisition module: configured to acquire the actual delay time and the actual number of delays of acetylene gas when the drill tool is descending;

[0020] a leak location acquisition module: configured to obtain the drill tool leak location according to the theoretical delay time, the actual delay time and the actual number of delays.

[0021] A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for quickly positioning a drill tool leak location.

[0022] A computer readable storage medium, the computer readable storage medium stores a computer program, the computer program is executed by a processor to implement the steps of the method for quickly positioning a drill tool leak location.

[0023] Compared with the prior art, the present application has the following beneficial effects: the present application provides a method for quickly positioning the position of drill tool puncture, calcium carbide (main component CaC2) is put into the wellhead drill tool, calcium carbide reacts to produce acetylene gas (CaC2+2H2O=Ca(OH)2+C2H2) in the drilling fluid, the acetylene gas goes down with the drilling fluid, part of the acetylene gas is punctured from the drill tool puncture position into the wellbore annulus, another part of the acetylene gas goes down with the drilling fluid to the drill bit and enters the wellbore annulus, and the two parts of acetylene gas return to the ground at different times, and are detected by a comprehensive logging instrument chromatogram after degassing, when other engineering parameters are insufficient to determine whether drill tool puncture occurs, the drill tool puncture can be quickly verified; the position of the drill tool puncture can be obtained by detecting the time difference of the acetylene gas and combining with engineering logging parameters, the detection method has high accuracy and high detection efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A flow chart of the method for quickly positioning the position of drill tool puncture of the present application;

[0025] Figure 2 A system block diagram of the method for quickly positioning the position of drill tool puncture of the present application;

[0026] Figure 3 A real-time analysis curve diagram of the logging instrument chromatogram of the embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0029] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the device or element indicated to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0031] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0032] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] As Figure 1 The present application provides a method for quickly positioning the leaking position of a drilling tool, comprising:

[0034] S101 obtaining the theoretical late time of acetylene gas after the drilling tool at the wellhead is put into calcium carbide;

[0035] S102 obtaining the actual late time and the actual late times of acetylene gas when the drilling tool is descending;

[0036] S103 obtaining the leaking position of the drilling tool according to the theoretical late time, the actual late time and the actual late times.

[0037] Calcium carbide (main component CaC2) is put into the drilling tool at the wellhead, and calcium carbide reacts with water in the drilling fluid to produce acetylene gas (CaC2+2H2O=Ca(OH)2+C2H2), which descends with the drilling fluid in the drilling tool, and a part of the acetylene gas is pierced out from the drilling tool to enter the wellbore annulus, and the other part of the gas descends with the drilling fluid to the drill bit to enter the wellbore annulus, and then returns to the ground with the drilling fluid. The two parts of acetylene gas return to the ground at different times, and are detected by a comprehensive logging instrument after degassing by a degasser, and when other engineering parameters are insufficient to determine whether the drilling tool has pierced, the drilling tool can be quickly verified to have pierced.

[0038] Theoretical delay time of acetylene gas is the time of acetylene gas descending with drilling fluid, passing through the drill bit and returning to the ground with drilling fluid.

[0039] The theoretical delay time can be directly calculated through the borehole related data.

[0040] After the acetylene gas returns to the ground, it is degassed through a degasser and then enters a comprehensive logging instrument chromatograph for detection.

[0041] The degasser and the comprehensive logging instrument chromatograph are necessary equipment during drilling, and no other equipment needs to be additionally used.

[0042] The actual delay time of acetylene gas is used to determine the number of punctures.

[0043] When the actual delay time of acetylene gas is greater than 1, it indicates that there is a puncture.

[0044] The actual delay time and the actual delay time one-to-one correspond.

[0045] According to the theoretical delay time, the actual delay time and the actual delay time, a calculation method for the position of the drill tool puncture is obtained.

[0046]

[0047] Wherein, H is the distance (m) from the drill tool puncture to the drill bit, T is the time difference between the actual delay time and the theoretical delay time, Q is the pump displacement of the drilling fluid, D is the borehole diameter; d is the outer diameter of the drill pipe, and d1 is the inner diameter of the drill pipe.

[0048] Another embodiment of the present application provides a method for quickly positioning the position of a drill tool puncture.

[0049] Before the development of the present patent, there are mainly three methods for quickly determining the position of a puncture based on existing materials, equipment and data, 1) using a color plastic sheet as an indicator and throwing it from the wellhead, descending with the drilling fluid in the drill tool, returning to the ground at the drill tool puncture, and calculating the position of the drill tool puncture by observing the time interval of the color plastic sheet returning to the ground; 2) using a "brown rope knot" thrown from the wellhead, descending with the drilling fluid in the drill tool to the drill tool puncture, and calculating the position of the drill tool puncture by detecting the time of pump pressure rising and pump stroke falling; 3) developing a special device and establishing a hydrodynamic model to position the drilling puncture position.

[0050] For the determination of the position of the drill tool puncture underground, a method for quickly determining the position information of the drill tool puncture based on gas logging technology and engineering parameter logging technology.

[0051] (1) The method for judging the drill string leakage: the principle of measuring the late time of calcium carbide: calcium carbide (main component is CaC2) is put into the drill string at the wellhead, calcium carbide reacts with water in the drilling fluid to produce acetylene gas (CaC2+2H2O=Ca(OH)2+C2H2), which goes down with the drilling fluid, passes through the drill bit, and then returns to the ground with the drilling fluid, and after degassing in the degassing device, enters the chromatogram of the comprehensive logging instrument, showing an abnormally high peak value of gas measurement component C2, while other components remain almost unchanged, so as to determine a cycle time, and the late time at the drill bit is obtained by subtracting the downward time.

[0052] (2) The method for judging the drill string leakage: if the drill string leaks, part of the acetylene gas is injected from the drill string leakage to return to the ground with the drilling fluid, and the other part of the gas goes down to the drill bit with the drilling fluid to return to the ground, and after degassing in the degassing device, the acetylene gas returned from the drill string leakage and the drill bit is detected twice in the chromatogram of the comprehensive logging instrument, so that the drill string leakage can be judged through this phenomenon.

[0053] (3) The method for quickly positioning the position of the drill string leakage: when the drill string leaks, the acetylene gas produced by the calcium carbide put into the drill string at the wellhead goes down to the drill string leakage, part of the acetylene gas is injected from the drill string leakage into the wellbore annulus, and the other part of the gas goes down to the drill bit to enter the wellbore annulus, and then returns to the ground with the drilling fluid, and after degassing in the degassing device, the acetylene gas returned from the drill string leakage is detected by the chromatogram of the comprehensive logging instrument before the acetylene gas returned from the drill bit. Through the time difference of two detections of acetylene gas combined with engineering logging parameters, the position of the drill string leakage from the drill bit can be obtained, and the calculation formula is:

[0054]

[0055] In the formula:

[0056] H - the distance between the drill string leakage and the drill bit (m);

[0057] T - the absolute value of the time difference of two detections of acetylene gas (min);

[0058] Q - the pump displacement of the drilling fluid (m 3 / min);

[0059] D - the borehole diameter (m);

[0060] d - the outer diameter of the drill pipe (m);

[0061] d1 - the inner diameter of the drill pipe (m).

[0062] After the implementation of the technology, the occurrence of drill string leakage is judged by detecting acetylene gas twice by putting calcium carbide once. The time difference of twice detection of acetylene gas is combined with engineering logging parameters to calculate that part of the acetylene gas is injected from the drill string leakage and returned to the ground with the drilling fluid, and the other part of the gas is injected at the drill bit and returned to the ground with the drilling fluid. After degassing in the degasser, the acetylene gas returned from the drill string leakage and the drill bit is detected twice in the chromatogram of the comprehensive logging instrument. Through this phenomenon, the drill string leakage can be judged, and the position of the drill string leakage can be obtained.

[0063] Specific application:

[0064] A well case

[0065] A well is drilled to a depth of 3868m, and the pump pressure slowly decreases from 13.8MPa to 13.3MPa, and the pump stroke slowly decreases from 148str / min to 145str / min, and then the pump pressure and pump stroke slowly tend to be stable. The logging online staff judges that the drill string is leaking, and the drilling team analyzes that the problem is the water efficiency of the pump, and does not accept the drill string leakage prediction result proposed by the logging team. In order to verify whether the drill string is leaking, calcium carbide is put into the drill string at the wellhead, and two C2 peak values appear on the real-time chromatogram analysis graph Figure 3 ), which verifies the drill string leakage prediction result. Through the time difference of 9 minutes of twice detection of C2 peak value, the drill string leakage position is calculated to be about 298m away from the drill bit according to the calculation formula and real-time engineering parameters.

[0066] Calculation formula and parameters:

[0067]

[0068] In the formula:

[0069] ΔT—The time difference of twice detection of acetylene gas is 9min;

[0070] Q—Drilling fluid pump displacement 2.75m3 / min;

[0071] D—Borehole diameter 0.3333m, taking the drill bit diameter 0.3333m;

[0072] d—Drill rod outer diameter 0.1492m;

[0073] d1—Drill rod inner diameter 0.1299m;

[0074] ΔH—The distance between the drill string leakage and the drill bit is 298m.

[0075] The drilling team adopts the judgment and suggestion of the logging team, and checks the drilling tool during tripping out, and finds that there is a 3.5cm*1.0cm slit hole in the body of the ordinary drill pipe at a distance of 307m from the drill bit. The patent method is used to accurately judge that the drilling tool is punctured, and the position of the drilling tool puncture is 9m different from the actual measurement data, with an error less than the length of one drill pipe (9.60m), and has high precision. The patent method is used to successfully reduce the risk of major drilling engineering accidents and major losses of Wulu 1 well.

[0076] The application further provides a system for quickly positioning a puncture position of a drilling tool, and comprises:

[0077] a theoretical acquisition module that acquires a theoretical late time of an acetylene gas after the drilling tool is put into the calcium carbide at the wellhead;

[0078] an actual acquisition module that acquires an actual late time and an actual late time of the acetylene gas when the drilling tool is descending;

[0079] a puncture position acquisition module that acquires the puncture position of the drilling tool according to the theoretical late time, the actual late time and the actual late time.

[0080] An embodiment of the application provides a terminal device. The terminal device of the embodiment comprises a processor, a memory, and a computer program stored in the memory and executable on the processor. The processor implements the steps in each of the method embodiments when executing the computer program. Alternatively, the processor implements the functions of each module / unit in each of the device embodiments when executing the computer program.

[0081] The computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the application.

[0082] The terminal device can be a desktop computer, a notebook computer, a palm computer, a cloud server, and other computing devices. The terminal device can include, but is not limited to, a processor and a memory.

[0083] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.

[0084] The memory can be configured to store the computer programs and / or modules, and the processor realizes various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory, and calling data stored in the memory.

[0085] The modules / units integrated in the terminal device, if realized in the form of software function units and sold or used as independent products, can be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the above-mentioned embodiment methods can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. When the processor executes the computer program, the steps of the above-mentioned various method embodiments can be realized. The computer program includes computer program code, which can be in the form of source code, object code, executable file or some intermediate form. The computer readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier wave signal, telecommunication signal and software distribution medium, etc. It should be noted that the content included 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, the computer readable medium does not include electric carrier wave signal and telecommunication signal.

[0086] Although the embodiments of the present application are described above in combination with the drawings, the present application is not limited to the above-mentioned specific embodiments and application fields, and the above-mentioned specific embodiments are only illustrative and guiding, but not limiting. Those skilled in the art can make many forms without departing from the scope of the claims of the present application under the guidance of the specification, and these all belong to the protection of the present application.

Claims

1. A method for quickly locating the location of drill bit leakage, characterized in that, include: To obtain the theoretical delay time of acetylene gas after calcium carbide is inserted into the wellhead drill string; Obtain the actual delay time and actual number of delays of acetylene gas during the drilling process; The location of drill string leakage is determined based on the theoretical late time, actual late time, and actual number of late arrivals. The theoretical delay time of the acetylene gas is the time it takes for the acetylene gas to travel down with the drilling fluid, pass through the drill bit, and return to the surface with the drilling fluid. The method for calculating the location of drill string leakage based on theoretical lateness time, actual lateness time, and actual number of late arrivals is as follows: in, H is the distance (m) between the drill bit and the point of leakage in the drill string. T is the time difference between the actual late time and the theoretical late time, which is the absolute value of the time difference between the two detections of acetylene gas; Q is the drilling fluid pump displacement; D is the wellbore diameter; d is the drill pipe outer diameter; and d1 is the drill pipe inner diameter.

2. The method for quickly locating the location of drill bit leakage according to claim 1, characterized in that, After the acetylene gas returns to the ground, it is degassed by a degasser and then enters the integrated logging instrument for chromatographic detection.

3. The method for quickly locating the location of drill bit leakage according to claim 1, characterized in that, The actual number of times acetylene gas is delayed is used to determine the amount of leakage.

4. The method for quickly locating the location of drill bit leakage according to claim 1, characterized in that, The actual number of times late and the actual time of lateness correspond one-to-one.

5. A system for quickly locating the location of drill bit leakage, characterized in that, include: Theoretical Acquisition Module: Used to obtain the theoretical delay time of acetylene gas after calcium carbide is inserted into the wellhead drill string; Actual Acquisition Module: Used to acquire the actual delay time and actual number of delays of acetylene gas during the drilling process. Leakage Location Acquisition Module: Used to obtain the location of drill string leakage based on theoretical late time, actual late time, and actual number of late arrivals; The theoretical delay time of the acetylene gas is the time it takes for the acetylene gas to travel down with the drilling fluid, pass through the drill bit, and return to the surface with the drilling fluid. The method for calculating the location of drill string leakage based on theoretical lateness time, actual lateness time, and actual number of late arrivals is as follows: in, H is the distance (m) between the drill bit and the point of leakage in the drill string. T is the time difference between the actual late time and the theoretical late time, which is the absolute value of the time difference between the two detections of acetylene gas; Q is the drilling fluid pump displacement; D is the wellbore diameter; d is the drill pipe outer diameter; and d1 is the drill pipe inner diameter.

6. 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, it implements the steps of the method for quickly locating the location of a drill bit leak as described in any one of claims 1 to 4.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for quickly locating the location of a drill bit leak as described in any one of claims 1 to 4.

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