Oil drilling grouting overflow and leakage prevention device

Abstract

The utility model provides a kind of petroleum drilling grouting anti-overflow, anti-bleeding device, solve the problem that manual control introduces outside mud liquid into wellhead, operation is cumbersome;The device includes grouting tank, grouting pump, backflow monitoring device and mud tank, grouting tank is communicated with drilling by mud pipeline, grouting pump is set on mud pipeline, when grouting pump is opened, grout in grouting tank can flow into wellhead by entering mud pipeline;The wellhead of drilling is connected with mud tank by backflow pipeline, flows into mud tank;Backflow monitoring device is set on backflow pipeline, for detecting whether there is overflow mud in backflow pipeline. Mud grouting does not need manual control, by starting and stopping grouting pump, improve operation efficiency. At the same time, by backflow time, whether overflow or well leakage occurs in well can be accurately found, so as to take preventive measures in time.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling technology, and in particular to an oil drilling grouting anti-overflow and anti-leakage device. Background Technology

[0002] During the tripping-out process in oil drilling, as the drill pipe is pulled out of the wellbore one by one, the fluid level inside the wellbore drops accordingly, resulting in a decrease in the static pressure of the fluid column. If this pressure falls below the formation pressure, it may cause formation fluids to invade the wellbore, leading to serious safety accidents such as overflows or even blowouts. Therefore, industry standard operating procedures require that drilling fluid be periodically replenished into the wellbore during the tripping-out process, i.e., grouting, to maintain a stable fluid column pressure inside the well.

[0003] In current technology, grouting is done manually, which makes it very easy for leakage to occur, causing drilling overflow risks. Utility Model Content

[0004] The purpose of this utility model is to provide a device for preventing overflow and leakage in oil drilling grouting, so as to solve the problem that in the prior art, manual grouting is required to balance the bottom pressure of the well and to manually control the grouting, which is cumbersome. The various technical effects of the preferred technical solution among the many technical solutions provided by this utility model are described in detail below.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The oil drilling grouting overflow and well leakage prevention device provided by this utility model includes a grouting tank, a grouting pump, a backflow monitoring device, a mud tank, and a control device, wherein: The grouting tank is connected to the wellhead via a mud pipe, and the grouting pump is installed on the mud pipe. When the grouting pump is turned on, the grout in the grouting tank can flow into the well through the mud pipe. The wellhead is connected to the mud tank via a reflux pipe, and the overflow fluid at the wellhead can flow into the mud tank through the reflux pipe; a reflux monitoring device is installed on the reflux pipe to detect whether there is mud flowing in the reflux pipe.

[0006] Preferably, the backflow monitoring device includes a backflow switch.

[0007] Preferably, the backflow monitoring device includes a flow switch.

[0008] Preferably, the reverse current switch includes a mechanical baffle switch or a non-contact proximity switch.

[0009] Preferably, the automatic grouting and overflow prevention device for oil drilling further includes: The monitoring module is used to monitor the number of drill strings pulled up during the drilling trip process in real time; The control device is electrically connected to the monitoring module, the grouting pump, and the backflow monitoring device. The control device is configured to: When the monitoring module detects that the lifting state of the drill bit meets the preset grouting start conditions, it controls the grouting pump to start and starts the internal timer. When the backflow monitoring device detects mud overflowing from the wellhead, it controls the grouting pump to stop and stops the internal timer to obtain the actual grouting time used for this grouting.

[0010] Preferably, the grouting start condition is at least one of the following: the number of drill bits pulled out reaches a preset value, the cumulative drilling time reaches a preset duration, or an external start command is received.

[0011] Preferably, the monitoring device includes a drum encoder, which is used to monitor the number of drill bits pulled up during the drilling trip process in real time.

[0012] Preferably, the oil drilling grouting overflow and well leakage prevention device further includes an alarm unit, the control device is electrically connected to the alarm unit, and the control unit is further configured to: The actual grouting time is compared with a preset normal time range, and the alarm unit is controlled to output an alarm signal for diagnosing abnormal working conditions based on the comparison result.

[0013] Preferably, the alarm unit includes an audible and visual alarm.

[0014] The oil drilling grouting overflow and well leakage prevention device provided by this utility model has the following advantages compared with the prior art: the grout in the grouting tank can flow into the wellhead through the mud pipe without manual control, which improves the efficiency of operation. At the same time, the backflow monitoring device on the backflow pipe can diagnose whether there is overflow or well leakage, which improves the detection efficiency of abnormal conditions and ensures the safety of operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a device for preventing overflow and leakage in oil drilling grouting. Figure 2 It is a block diagram of the control principle of the control system.

[0017] In the diagram: 1. Grouting tank; 2. Drilling well; 3. Mud tank; 4. Mud pipe; 5. Reverse flow pipe; 6. Grouting pump; 7. Reverse flow switch; 8. Drill pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be understood that the terms "center," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] This utility model provides a device for preventing overflow and well leakage during oil drilling grouting, which enables timely and reliable grouting and provides a predictive alarm function for overflow and well leakage.

[0022] The following is combined with Figure 1 and Figure 2 The technical solution provided by this utility model will be described in more detail.

[0023] See Figure 1The oil drilling grouting overflow and well leakage prevention device provided by this utility model includes a grouting tank 1, a grouting pump 6, a backflow monitoring device, and a mud tank 3. The grouting tank 1 is connected to the well 2 through a mud pipe 4. The grouting pump 6 is installed on the mud pipe 4. When the grouting pump 6 is turned on, the grout in the grouting tank 1 can flow into the well 2 through the mud pipe 4. The wellhead of the well 2 is connected to the mud tank 3 through a backflow pipe 5. The overflow liquid at the wellhead can flow into the mud tank 3 through the backflow pipe 5. A backflow monitoring device is installed on the backflow pipe 5 to detect whether there is mud flow in the backflow pipe 5.

[0024] The mud pipe 4 and the backflow pipe 5 are typically high-pressure hoses or rigid pipes. The end of the mud pipe 4 is connected to the grouting joint at the wellhead of the well 2 to inject the slurry in the grouting tank 1 into the wellbore of the wellhead 2. The mud tank 3 is used to receive and store the slurry overflowing from the wellhead.

[0025] As an optional implementation, see Figure 1 and Figure 2 As shown, the oil drilling grouting overflow and well leakage prevention device also includes: a monitoring module for real-time monitoring of the lifting status of the drill string (specifically, drill pipe 8) during the drilling process of drilling 2; and a control device electrically connected to the monitoring module, the grouting pump 6, and the backflow monitoring device. The control device is configured to: when the monitoring module detects that the lifting status of the drill string (drill pipe 8) meets the preset grouting start conditions, control the grouting pump 6 to start and start the internal timer; when the backflow monitoring device detects mud overflowing from the wellhead, control the grouting pump 6 to stop and stop the internal timer, thereby obtaining the actual grouting time used for this grouting.

[0026] The grouting start conditions are at least one of the following: the number of drill bits (drill rods 8) pulled out reaches a preset value, the cumulative drilling time reaches a preset duration, or an external start command is received.

[0027] In this embodiment, the control device can be a programmable logic controller (such as Siemens' S7-1200 series), equipped with a digital input module, a digital output module, and a central processing unit for timing and logic operations. The monitoring module can be an incremental rotary encoder, i.e., a drum encoder, mounted on the end of the winch drum shaft of drilling 2. It is understood that for each drill pipe 8 lifted or lowered by one column length, the drum rotates a relatively fixed number of revolutions. By accurately measuring the number of revolutions of the drum, the number of drill pipes 8 that have been pulled out can be calculated. The drum encoder sends its output pulse signal to the digital input module of the control device via a signal cable.

[0028] A backflow monitoring device is used to monitor whether slurry overflow occurs at the wellhead of well 2. The backflow monitoring device includes a backflow switch 7 or a flow meter. The backflow switch 7 includes a mechanical float switch or a non-contact proximity switch.

[0029] In this embodiment, the backflow monitoring device is specifically a mechanical baffle switch, which is installed inside the backflow pipe 5. When no slurry flows through, the float is in a low position, and the switch is normally open. Once the wellbore is full, slurry overflows from the wellhead and flows into the backflow pipe 5. The flowing slurry lifts the float, causing the switch to close, thereby outputting a switching signal. This float switch is connected to another digital input terminal of the control device via hardwiring.

[0030] As an optional implementation, the oil drilling grouting overflow prevention and well leakage prevention device also includes an alarm unit. The control device is electrically connected to the alarm unit, and the control unit is also configured to compare the actual grouting time with a preset normal time range, and control the alarm unit to output an alarm signal for diagnosing abnormal working conditions based on the comparison result.

[0031] Specifically, the alarm unit includes an audible and visual alarm, whose power control line is connected to a terminal of the digital output module of the control device to issue a warning to the on-site operator when an abnormal operating condition is detected.

[0032] The following will combine Figure 2 The working process of the device in this embodiment will be described in detail.

[0033] After the drilling operation begins, step S101 is executed: monitor the drilling status. The winch drum rotates, driving the monitoring module (i.e., the drum encoder) at its shaft end to rotate synchronously. The latter continuously generates pulse signals and sends them to the control device. The counter inside the control device counts the received pulses and calculates the number of drill string columns that have been pulled out in real time according to a preset conversion relationship (for example, every 10,000 pulses represent one rotation of the drum, and the drum rotates 2.5 times for each drill string column lifted).

[0034] Subsequently, in step S102, it is determined whether the grouting conditions are met. The control device compares the real-time calculated number of columns with the preset trigger value (3 columns). If the number is less than 3, it is determined as "no", and the process returns to step S101 to continue monitoring.

[0035] When it is determined in step S102 that the cumulative number of columns pulled out has reached 3, the process proceeds to step S103: start grouting and timing. At this time, the control device immediately performs two parallel actions: First, it sets the digital output terminal connected to the control relay of the grouting pump 6 to a high level, causing the relay to engage, thereby connecting the main power supply of the grouting pump 6, starting the grouting pump 6, and beginning to pump the grout in the grouting tank 1 into the wellhead 2 through the mud pipe 4; Second, it starts an internal timer (for example, using the TON instruction in the ladder logic) to start timing the current grouting process.

[0036] After grouting begins, the process proceeds to step S104: monitoring overflow. At this time, the control device begins to continuously scan the status of the digital input terminal connected to the reverse flow switch 7 (i.e., the float switch).

[0037] In step S105, it is determined whether an overflow has occurred. As long as the liquid level in the wellbore has not reached the wellhead, there is no liquid flow in the backflow pipe 5, the float switch remains open, the corresponding input terminal is at a low level, the determination result is "no", and the process returns to step S104 to continue monitoring.

[0038] As grouting pump 6 continuously pumps grout into the well, the wellbore level gradually rises. When the level reaches the wellhead and begins to overflow, the grout flows into the backflow pipe 5, pushing the float switch to close, and the process enters step S106: stopping grouting and timing. The control device then performs two parallel actions: first, it sets the digital output terminal controlling grouting pump 6 to a low level, causing the relay to disconnect and grouting pump 6 to stop working; second, it stops the internal timer and reads its recorded cumulative time value, which is the actual grouting duration of this grouting process, denoted as Ta, and stores it in an internal data register.

[0039] Following this, the process enters the operational condition diagnosis phase, namely step S107: comparing durations to determine anomalies. The control device compares the actual grouting duration Ta stored internally with a preset normal time range (e.g., lower limit Tmin = 90 seconds, upper limit Tmax = 120 seconds). The specific comparison logic is to determine whether Ta is less than Tmin or greater than Tmax.

[0040] If Ta is within the range of [90, 120] seconds, then in step S107, it is determined that the grouting process is normal, the process ends directly, and the process waits for the triggering of the next grouting cycle.

[0041] If Ta is less than 90 seconds or greater than 120 seconds, it is determined in step S107 that the grouting duration is abnormal, potentially indicating a risk to the downhole working conditions. At this point, the process proceeds to step S108: triggering an alarm. The control device 50 sets the digital output terminal connected to the alarm unit to a high level, driving the audible and visual alarm to emit a continuous audible and visual alarm to remind on-site operators to pay attention to and check the downhole situation. The alarm signal can be designed to automatically stop after a certain period or require manual confirmation before resetting. The process then ends.

[0042] In summary, the device in this embodiment not only realizes grouting during the tripping process, avoiding grouting omissions or forgetting to grout due to manual operation, but also provides preliminary early warning of potential abnormal conditions such as well leakage and well kick, thereby significantly improving the safety of drilling operations.

[0043] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A petroleum drilling grouting anti-flowing and anti-leaking device, characterized in that, Includes grouting tank, grouting pump, backflow monitoring device, and mud tank, among which: The grouting tank is connected to the well via a mud pipe, and the grouting pump is installed on the mud pipe. When the grouting pump is turned on, the grout in the grouting tank can flow into the wellhead through the mud pipe. The wellhead of the well is connected to the mud tank via a reflux pipe, and the overflow fluid at the wellhead can flow into the mud tank through the reflux pipe; a reflux monitoring device is installed on the reflux pipe to detect whether there is overflow mud flowing in the reflux pipe.

2. The oil drilling grouting anti-flowing and anti-leaking device according to claim 1, characterized in that, The backflow monitoring device includes a backflow switch.

3. The oil drilling grouting anti-flowing and anti-leaking device according to claim 1, characterized in that, The backflow monitoring device includes a flow switch.

4. The oil drilling grouting anti-flowing and anti-leaking device according to claim 2, characterized in that, The reverse current switch includes a mechanical baffle switch or a non-contact proximity switch.

5. The oil drilling grouting overflow and well leakage prevention device according to claim 1, characterized in that, The oil drilling grouting overflow and well leakage prevention device also includes: The monitoring module is used to monitor the number and status of drill string being pulled up during the drilling trip process in real time. The control device is electrically connected to the monitoring module, the grouting pump, and the backflow monitoring device. The control device is configured to: When the monitoring module detects that the number and status of the drill bit being pulled up meet the preset grouting start conditions, it controls the grouting pump to start and simultaneously starts the internal timer. When the backflow monitoring device detects mud overflowing from the wellhead, it controls the grouting pump to stop and stops the internal timer to obtain the actual grouting time used for this grouting.

6. The oil drilling grouting anti-flowing and anti-leaking device according to claim 5, characterized in that, The grouting start condition is at least one of the following: the number of drill bits pulled out reaches a preset value, or an external start command is received.

7. The oil drilling grouting anti-flowing and anti-leaking device according to claim 5, characterized in that, The monitoring device includes a drum encoder, which is used to monitor the number of drill bits pulled up during the drilling trip process in real time.

8. The oil drilling grouting anti-flowing and anti-leaking device according to claim 5, characterized in that, The automatic grouting and overflow prevention device for oil drilling also includes an alarm unit, and the control device is electrically connected to the alarm unit. The control device is further configured to: The actual grouting time is compared with a preset normal time range, and the alarm unit is controlled to output an alarm signal for diagnosing abnormal working conditions based on the comparison result.

9. The oil drilling grouting anti-flowing and anti-leaking device according to claim 8, characterized in that, The alarm unit includes an audible and visual alarm.

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