System for monitoring annulus liquid level in drilling well leakage state

Abstract

The utility model discloses a system for monitoring an annulus liquid level in a drilling well leakage state, which comprises a well mouth temporary plugging device, a drilling well liquid level monitoring device, a drilling well liquid level monitoring device, a drilling well liquid level monitoring device, a drilling well liquid level monitoring device and a drilling well liquid level monitoring device, and is characterized in that the well mouth temporary plugging device is used for temporarily plugging an upper port of a shaft during drilling well leakage; the annulus liquid level monitoring device is arranged on the well killing manifold and is used for measuring a detection signal representing the dynamic change characteristics of the annulus liquid level by adopting a sound wave measurement technology; and the monitoring device is used for obtaining a dynamic environmental control liquid level measurement value according to the detection signal. Under the leakage state, the annular liquid level can be continuously monitored without closing the blowout preventer.

Description

Technical Field

[0001] The utility model relates to the technical field of annulus liquid level monitoring, in particular to a system for monitoring the annulus liquid level under the condition of drilling fluid loss. Background Technique

[0002] Well leakage is a downhole accident with relatively large losses and great hazards frequently occurring during the drilling process. Especially when drilling through ultra-low pressure formations or fractured formations, the phenomenon of drilling fluid loss returns easily occurs. When the well leaks and the fluid returns, the static liquid level cannot be directly observed at the wellhead, and the liquid column pressure in the well continuously decreases. During the treatment process, due to the inability to grasp the leakage situation in the wellbore in real time, it is impossible to predict the position where the formation pressure and the drilling fluid liquid column pressure reach equilibrium and the leakage rate, which easily causes too much or too little drilling fluid to be poured in, resulting in waste of drilling fluid and even well collapse and blowout accidents.

[0003] At present, the annulus perfusion drilling fluid technology is generally used to handle drilling fluid loss, but it has the following disadvantages: 1. It cannot monitor the position of the annulus liquid level in real time, and it is impossible to grasp the position of the leakage balance point and the leakage rate; 2. The real-time continuity of liquid level monitoring is poor, and the blowout preventer must be closed, which cannot meet the requirements of on-site operations; 3. The timing and amount of drilling fluid perfusion are determined by the empirical method, basically in a "blind perfusion" state, and the drilling fluid is poured in according to the displacement volume of the drill string, resulting in waste of drilling fluid.

[0004] Therefore, it is necessary to provide a solution that can continuously and accurately measure the annulus liquid level when drilling fluid loss occurs in the well, so as to solve one or more of the problems that the existing annulus liquid level monitoring technology needs to close the wellhead blowout preventer (closing the blowout preventer delays time), cannot continuously monitor the annulus liquid level during tripping operations, and cannot adapt to the complex production environment on the well. Content of the Utility Model

[0005] The purpose of the utility model is to provide a solution that can continuously and accurately measure the annulus liquid level when drilling fluid loss occurs in the well, so as to solve one or more of the problems that the existing annulus liquid level monitoring technology needs to close the wellhead blowout preventer (closing the blowout preventer delays time), cannot continuously monitor the annulus liquid level during tripping operations, and cannot adapt to the complex production environment on the well.

[0006] To solve the above technical problems, an embodiment of the utility model provides a system for monitoring the annulus liquid level under the condition of drilling fluid loss, including: a wellhead temporary plugging device, which is used to temporarily plug the upper port of the wellbore when drilling fluid loss occurs to block the upward propagation path of sound waves; an annulus liquid level monitoring device, which is arranged on the kill line manifold and is used to measure a detection signal representing the dynamic change characteristics of the annulus liquid level by using acoustic measurement technology; a monitoring device, which is used to obtain a dynamic annulus liquid level measurement value according to the detection signal.

[0007] Preferably, the wellhead temporary plugging device includes at least two rubber plugs installed at the upper port of the wellbore to temporarily plug the upper port of the wellbore.

[0008] Preferably, the annulus liquid level monitoring device includes: an infrasonic wave transceiver for transmitting an infrasonic wave signal to the annulus liquid level and receiving the reflected infrasonic wave signal reflected at the annulus liquid level, so as to characterize the dynamic change characteristics of the annulus liquid level by using the reflected infrasonic wave signal; a communication device for transmitting the reflected infrasonic wave signal to the monitoring device.

[0009] Preferably, the annulus liquid level monitoring device further includes a filter disposed between the infrasonic wave transceiver and the communication device for filtering the reflected infrasonic wave signal, so that the communication device transmits the filtered reflected infrasonic wave signal to the monitoring device.

[0010] Preferably, the at least two rubber plugs are disposed at the upper port of the wellbore through a mounting bracket; the at least two rubber plugs are two rubber plugs.

[0011] Preferably, the two rubber plugs are constructed into a two-piece clamping structure through a hinge, the hinge is connected to the mounting bracket, and the mounting bracket is fixed on the wellbore.

[0012] Preferably, the annulus liquid level monitoring device further includes a power boosting device disposed at the front end of the infrasonic wave transceiver for boosting the power of the infrasonic wave signal to be transmitted by providing specified pressure energy.

[0013] Preferably, the specified pressure energy is achieved by gas boosting.

[0014] Preferably, the power boosting device uses a nitrogen gas booster.

[0015] Preferably, the system further includes an inlet flow sensor disposed on the slurry pipeline of the tank for real-time measurement of the grouting flow rate.

[0016] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects:

[0017] The present invention proposes a system for monitoring the annulus liquid level under the condition of drilling fluid loss. In the case of fluid loss, the system can continuously monitor the annulus liquid level without closing the blowout preventer, achieving the purpose of reducing the waste of drilling fluid loss on the premise of well control safety.

[0018] Other features and advantages of the present utility model will be described in the subsequent specification, and partly will become apparent from the specification, or will be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained by the structures specifically pointed out in the specification, claims and drawings. Description of the Drawings

[0019] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of the system for monitoring the annulus liquid level under the condition of drilling fluid loss in the embodiment of the present application.

[0021] Figure 2 It is a schematic diagram of the specific structure of the system for monitoring the annulus liquid level under the condition of drilling fluid loss in the embodiment of the present application.

[0022] Figure 3 It is a schematic diagram of the application scenario of the wellhead temporary plugging device and the annulus liquid level monitoring device in the system for monitoring the annulus liquid level under the condition of drilling fluid loss in the embodiment of the present application.

[0023] Figure 4 It is a schematic diagram of the installation scenario of the wellhead temporary plugging device in the system for monitoring the annulus liquid level under the condition of drilling fluid loss in the embodiment of the present application. Detailed Embodiments

[0024] The following will combine the drawings and embodiments to describe in detail the embodiments of the present utility model, so as to fully understand how the present utility model uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly. It should be noted that as long as there is no conflict, each embodiment in the present utility model and each feature in each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present utility model.

[0025] In addition, the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0026] The terms used herein are merely for describing specific embodiments and are not intended to limit the exemplary embodiments. Unless the context clearly dictates otherwise, the singular forms "a" and "an" used herein are also intended to include the plural. It should also be understood that the terms "comprises" and / or "comprising" specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not preclude the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0027] To solve one or several technical problems in the technical background, an embodiment of the present application proposes a system for monitoring the annulus liquid level under a drilling loss state. This system can continuously monitor the actual position of the annulus liquid level without closing the original blowout preventer ( Figure 3 No. 38 in).

[0028] Figure 1 FIG. is a schematic diagram of the overall structure of the system for monitoring the annulus liquid level under a drilling loss state according to an embodiment of the present application. As Figure 1 shown, the system for monitoring the annulus liquid level under a drilling loss state described in an embodiment of the present utility model (hereinafter referred to as "liquid level monitoring system") at least includes: an annulus liquid level monitoring device 1, a wellhead temporary plugging device 2, and a monitoring device 8.

[0029] In an embodiment of the present utility model, the annulus in the monitored annulus liquid level height refers to the annular space formed between the wellbore (anti-surge pipe) 6 and the drill pipe 5.

[0030] The wellhead temporary plugging device 2 is arranged on the upper port end face of the wellbore 6. The wellhead temporary plugging device 2 is used to temporarily plug the upper port of the wellbore during a drilling loss to block the upward propagation path of sound waves (i.e., the following infrasonic wave reflection signal).

[0031] The annulus liquid level monitoring device 1 is arranged on the surface kill line manifold. The annulus liquid level monitoring device 1 is used to measure a detection signal characterizing the dynamic change characteristics of the depth of the annulus liquid level 7 by using acoustic measurement technology under the condition of closing the upward propagation path of sound waves.

[0032] The monitoring device 8 is connected to the annulus liquid level monitoring device 1. The monitoring device 8 is used to obtain a dynamic annulus control liquid level measurement value according to the detection signal from the annulus liquid level monitoring device 1. In this way, after a well loss occurs, the accurate and continuous measurement of the annulus liquid level can still be achieved without closing the surface blowout preventer 38 by the short-term plugging effect of the wellhead temporary plugging device 2.

[0033] Figure 2 FIG. is a schematic diagram of the specific structure of the system for monitoring the annulus liquid level under a drilling loss state according to an embodiment of the present application. Figure 3Schematic diagram of the application scenarios of the wellhead temporary plugging device and the annulus liquid level monitoring device in the system for monitoring the annulus liquid level under the condition of drilling fluid loss according to the embodiments of the present application. As Figure 2 shown, the wellhead temporary plugging device 2 includes at least two rubber plugs 33 and a mounting bracket 34.

[0034] As Figure 3 shown, at least two rubber plugs 33 are installed on the end face of the upper port of the wellbore to achieve temporary plugging of the upper port of the wellbore. In one embodiment, at least two rubber plugs 33 are arranged on the end face of the upper port of the wellbore through the mounting bracket 34. Specifically, at least two rubber plugs 33 are preferably two rubber plugs 33a, 33b, see Figure 4 .

[0035] In a specific embodiment, the two rubber plugs 33a, 33b are constructed into a left and right two-lobe clamping structure through a hinge 20. The hinge 20 is connected to the bracket 34 arranged below the two-lobe clamping structure, and the bracket 34 is fixed on the wellbore 36. In this way, after the two wellhead rubber plugs 33 are closed left and right, through the supporting action of the mounting bracket 34 arranged below the two-lobe structure, the closed two-lobe structure can just plug the end face of the upper port of the wellbore 36. Thus, in the embodiment of the present invention, by controlling the opening and closing states of the two rubber plugs 33a, 33b, it is fixed on the upper port of the wellbore through the mounting bracket 34 to achieve temporary plugging of the wellbore port.

[0036] As Figure 2 shown, the annulus liquid level monitoring device 1 includes at least an infrasonic wave generating device 31.

[0037] In one embodiment, the infrasonic wave generating device 31 is equipped with an infrasonic wave transceiver. The infrasonic wave transceiver is used to transmit an infrasonic wave signal to the annulus control liquid level and receive the infrasonic wave reflection signal reflected by the infrasonic wave signal at the annulus control liquid level, so as to use the infrasonic wave reflection signal to characterize the dynamic change characteristics of the annulus liquid level.

[0038] Furthermore, the infrasonic wave generating device 31 is also equipped with a communication device connected to the infrasonic wave transceiver. The communication device is used to transmit the current infrasonic wave reflection signal to the above-mentioned monitoring device 8.

[0039] In addition, the infrasonic wave generating device 31 is also equipped with a filter. The filter is arranged between the infrasonic wave transceiver and the communication device. The filter is used to perform filtering processing on the received infrasonic wave reflection signal to obtain an infrasonic wave audio signal, so that the communication device transmits the filtered infrasonic wave reflection signal to the monitoring device 8.

[0040] In addition, as Figure 2 shown, the annulus liquid level monitoring device 1 further includes: a power lifting device 32. As Figure 3As shown, the power boosting device 32 is arranged at the front end of the infrasonic wave transceiver device in the infrasonic wave generating device 31. The power boosting device 32 is used to boost the power of the infrasonic wave signal to be transmitted by providing specified pressure energy.

[0041] In one embodiment, the specified pressure energy is achieved by gas supercharging. Specifically, the power boosting device 32 uses a nitrogen supercharger.

[0042] For the annulus liquid level monitoring device 1, in addition to having an infrasonic wave generating device, a nitrogen supercharger is also installed, and a wellhead rubber plug is installed at the wellhead. First, by installing a two-piece rubber plug at the upper end position of the wellbore, the loss of infrasonic wave energy is reduced, the interference from the external environment is reduced, and it is ensured that the infrasonic wave propagates downward along the annulus, achieving the same effect as closing the blowout preventer. Further, the liquid level monitoring system of the present utility model also amplifies the infrasonic wave pulse wave signal generated by the infrasonic wave generating device installed on the kill line by supercharging nitrogen to a specified pressure (such as 3 MPa), so as to achieve the purpose of reducing external interference.

[0043] The two rubber plugs 33 are transported above the wellbore 36 through the bracket 34 installed at the upper end position of the wellbore. The rubber plugs 33 are set and moved downward to close the upward propagation path of the sound wave. The nitrogen supercharger 32 amplifies the pulse wave generated by the infrasonic wave generating device 31 installed on the kill line through nitrogen supercharging. The received infrasonic wave reflection signal is processed by a filter to obtain an infrasonic wave audio signal and then transmitted to the acquisition control processing center 8, as Figure 3 shown.

[0044] In this way, through the loading of the wellhead temporary plugging device 1 or the combined loading of the wellhead temporary plugging device 1 and the power boosting device 32, it is possible to accurately and continuously measure the annulus liquid level without closing the surface blowout preventer 38 under the condition of wellbore leakage during drilling.

[0045] In addition, in order to ensure that the annulus liquid level is kept above the lost circulation balance position to achieve the purpose of active grouting, as Figure 1 shown, the liquid level detection system described in the embodiment of the present utility model further includes: an inlet flow sensor 3 and an automatic grouting device 4.

[0046] The inlet flow sensor 3 is arranged on the tank mud pipeline. The inlet flow sensor 3 is used to measure the grouting flow rate (i.e., the displacement of the grouting pump) in real time. The inlet flow sensor 3 installed on the grouting pipeline collects the grouting flow rate data in real time and transmits the grouting flow rate data collected in real time to the monitoring device 8 by using wireless communication technology.

[0047] At this time, the monitoring device 8 can also be used to adjust the real-time grouting volume according to the dynamically monitored value of the annular control liquid level and the grouting flow rate data collected in real time, so as to use the automatic grouting device 4 to make the annular liquid level reach a state above the loss balance position, thereby achieving the purpose of well control safety.

[0048] The utility model discloses a system for monitoring the annular liquid level under the condition of drilling loss. Under the condition of loss, the system can continuously monitor the annular liquid level without closing the blowout preventer, so as to reduce the waste of drilling fluid loss on the premise of well control safety.

[0049] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the utility model should be covered by the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

[0050] In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

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

[0052] It should be understood that the embodiments disclosed by the utility model are not limited to the specific structures, processing steps or materials disclosed herein, but should extend to equivalent substitutions of these features understood by those of ordinary skill in the relevant fields. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and do not mean to limit.

[0053] As used herein, the phrase "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" throughout the specification are not necessarily all referring to the same embodiment.

[0054] Although the embodiments disclosed in the present invention are as described above, the above content is only an embodiment adopted for the convenience of understanding the present invention and is not intended to limit the present invention. Any person skilled in the art within the technical field to which the present invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A system for monitoring the annular fluid level in a drilling loss state, characterized in that: include: A temporary wellhead plugging device is used to temporarily plug the wellbore upper port when drilling leakage occurs, so as to block the upward propagation path of sound waves; An annular space liquid level monitoring device is arranged on the well killing manifold and is used to measure the detection signal representing the dynamic change characteristics of the annular space liquid level by using the acoustic wave measurement technology; A monitoring device is used to obtain a dynamic environmental control liquid level measurement value based on the detection signal.

2. The system according to claim 1, characterized in that The wellhead temporary plugging device comprises: At least two rubber plugs are installed on the upper ports of the wellbore to achieve temporary blocking of the upper ports of the wellbore.

3. The system according to claim 2, characterized in that The annular space liquid level monitoring device comprises: An infrasound transceiver, which is used to transmit an infrasound signal to the environmental control liquid surface, and receive an infrasound reflection signal reflected by the infrasound signal at the environmental control liquid surface, so as to characterize the dynamic change characteristics of the annular space liquid surface by using the infrasound reflection signal; A communication device is used to transmit the infrasound wave reflection signal to the monitoring device.

4. The system according to claim 3, characterized in that The annular space liquid level monitoring device also includes: The filter disposed between the infrasound transceiver and the communication device is used to filter the infrasound reflection signal so that the communication device transmits the filtered infrasound reflection signal to the monitoring device.

5. The system according to claim 2, characterized in that The at least two rubber plugs are arranged on the upper ports of the wellbore by means of a mounting bracket; The at least two rubber plugs are two rubber plugs.

6. The system according to claim 5, characterized in that The two rubber plugs are constructed into a two-flap clamping structure through a hinge, the hinge is connected to the mounting bracket, and the mounting bracket is fixed on the wellbore.

7. The system according to claim 3 or 4, characterized in that: The annular space liquid level monitoring device also includes: The power boosting device arranged at the front end of the infrasonic wave transceiver is used to boost the power of the infrasonic wave signal to be transmitted by providing specified pressure energy.

8. The system according to claim 7, characterized in that The specified pressure energy is achieved by gas pressurization.

9. The system according to claim 8, characterized in that The power boosting equipment adopts a nitrogen booster.

10. The system according to claim 7, characterized in that The system further comprises: an inlet flow sensor arranged on the tank mud pipeline, which is used for measuring the grouting flow in real time.

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