81 results about "Lost circulation" patented technology

The invention discloses a well drilling leakage crack width prediction and bridging plugging particle optimization method and system. The method comprises the steps that reservoir leakage points are found through a logging tool, and the type of a leakage crack is recognized; the leakage crack type comprises a horizontal crack or a vertical crack; according to the reservoir leakage point, establishing a working fluid flowing mathematical model from the surface pipeline to the reservoir leakage point; according to the type of the leakage crack, constructing a leakage crack deformation mathematical model based on a displacement discontinuity theory; calculating the fluid pressure at the reservoir leakage point based on the working fluid flow mathematical model; according to the fluid pressure and the leakage data, the leakage crack width distribution is predicted based on the leakage crack deformation mathematical model; and preferably selecting the particle size of the bridging plugging particles according to the width distribution of the leakage crack. The method overcomes the defects that a traditional well drilling plugging material is high in selection subjectivity and lacks theoretical support, and the effects of improving the success rate of well drilling plugging operation, guaranteeing well drilling safety and improving the oil and gas recovery rate are expected to be achieved.

The invention relates to a drilling fluid leakage layer positioning method. The method comprises the steps that monitoring temperature data of a plurality of monitoring points with different depths set in a shaft are collected; the method comprises the following steps: preliminarily determining a potential leakage layer position of a drilling fluid leakage layer according to monitoring temperature data of a plurality of monitoring points with different depths on the basis of gradient change of a temperature value along with the depth of a shaft, setting a search range for further refining the leakage layer position according to the potential leakage layer position, and setting an initial search position of search; the initial search position is used as a search starting point, and at least two dynamic response indexes of temperature changing along with time are calculated; the search starting point is updated in a set mode, and iteration is executed again until iteration reaches a stop condition; and comparing the dynamic response indexes of at least two temperature changes along with time, which are obtained by each iteration, and based on a set strategy, determining a fine leakage layer position assumed by one iteration as a final drilling fluid leakage layer positioning position.

A system includes a drilling sub-system configured to form a wellbore from a terranean surface toward a subterranean formation by rotating a drill bit on a drill string; a drilling fluid circulation sub-system configured to circulate a drilling fluid downhole through the drill string, to and through the drill bit, into the wellbore, and uphole toward the terranean surface while the drilling sub-system drills the portion of the wellbore; and a lost circulation sub-system including a plurality of lost circulation material (LCM) pills configured to circulate, with the drilling fluid, through the drill string and the drill bit and into the wellbore in an inactive state. Each of the LCM pills is set to adjust from the inactive state to an active state to reduce at least a portion of the drilling fluid circulated into the wellbore that is lost to the subterranean formation.

The present invention discloses a lost circulation warning method based on the PCA-XGBOOST algorithm, which includes the following steps: S1. Establish a comprehensive mud logging time series matrix, and mark the comprehensive mud logging time series data according to different working conditions based on the status information of drilling operations. The normal working condition is marked as 0, and the data under the lost circulation accident is marked as 1; S2. Data preprocessing, eliminating the outliers in the comprehensive mud logging time series data through the 3σ criterion, and performing smoothing processing on the comprehensive mud logging time series data after elimination by using the Savitzky-Golay filter. The present invention combs the outliers in the comprehensive mud logging time series by using the 3σ criterion; the present invention uses the principal component analysis algorithm to rank the importance of the parameter features of the comprehensive mud logging time series, and using these strongly correlated features extracted for subsequent prediction can effectively avoid the occurrence of overfitting and the problems of insufficient memory and slow calculation caused by too large data volume, and improve the operation efficiency.

The application discloses a drilling well leakage monitoring method based on a downhole pressure data stream, which comprises the following steps: installing two measuring short sections in a drilling tool assembly, the measuring short sections being used for measuring the pressure or pressure difference of corresponding well depth positions, and one of the measuring short sections being close to the lower end of the drilling tool; recording drilling basic data for standby; calculating the actual well leakage index at the abnormal point of the pressure factor by using real-time drilling parameters in the drilling process, and comparing the actual well leakage index with a manually set well leakage index critical value to determine whether well leakage occurs; if the actual well leakage index is greater than the well leakage index critical value, it is determined that well leakage occurs, and the well leakage parameters are inferred according to the pressure factor change state, wherein the pressure factor delta is the ratio of the real-time pressure consumption coefficient at the time t to the reference pressure consumption coefficient. The application has good well leakage identification precision, is convenient for real-time monitoring of the well leakage condition, can quickly and roughly determine the well leakage parameters, has good accuracy and reliability, is convenient for making construction measure response quickly, and is favorable for guaranteeing downhole safety.

Lost circulation events are mitigated by determining a size and extent of a formation feature causing the loss of circulation. The formation feature may be determined based on surface drilling parameters, and can apply one or more of a mechanical specific energy, hydraulic, or aperture model. Using such model(s), the size of a fracture / void / aperture can be estimated and a treatment plan for a lost circulation vent can be determined. For instance, a mechanical specific energy of zero can indicate the presence of a void, the pressure at the standpipe can an extent of a formation feature, or the size of the formation feature can be estimated using drilling fluid flow rate, volume, pressure, or rheology. Determining a treatment plan can include selecting or designing a lost circulation material, a volume of lost circulation material, or alternative drilling methods.

The invention relates to the technical field of drilling tools, in particular to a strip mine aquifer branch hole while-drilling leaking stoppage and drainage integrated drilling tool which comprises a drill rod mechanism and a drill bit mechanism arranged at the bottom end of the drill rod mechanism, a two-way adjusting mechanism is arranged between the drill rod mechanism and the drill bit mechanism, and double flow channels are formed in the two-way adjusting mechanism. The outer side of the bidirectional adjusting mechanism is fixedly connected with a stabilizing mechanism; through cooperation of the elastic adjusting assembly and the opening and closing adjusting assembly, drilling fluid can be normally conveyed, the plugging agent cannot be discharged, when a leakage layer is detected, the elastic adjusting assembly resets to drive the opening and closing adjusting assembly to move, and the plugging agent can be accurately and directly conveyed to the leakage layer through a discharging groove and an auxiliary chip discharging groove of the stabilizing mechanism; waste of the plugging agent and the drilling fluid is avoided, meanwhile, the plugging agent can be prevented from being in contact with upward-returning mud liquid in the discharging process, and it is ensured that the plugging agent can be concentrated at the leakage position to play a role.

The invention relates to the technical field of return-loss and leakage oil and gas well repair of oil and gas fields, in particular to a wellbore dynamic liquid level wellhead temporary closing detection and risk assessment early warning system and method, and aims to solve the problem of sound wave diffusion caused by normal opening of a wellhead in the well repair process. The liquid level echo information cannot be directly measured; and the safety problem caused by lack of an effective gas detection early warning device is solved. The invention provides a wellbore dynamic liquid level wellhead temporary closing detection and risk assessment early warning system. The wellbore dynamic liquid level wellhead temporary closing detection and risk assessment early warning system comprises a wellhead temporary closing device, a gas detection device and a wellbore dynamic liquid level and pressure detection device. The wellhead temporary closing device is installed at a wellhead to close the wellhead, the gas detection device is used for monitoring and analyzing harmful gas, and the shaft dynamic liquid level and pressure detection device is used for monitoring the dynamic liquid level and wellhead pressure. The wellhead temporary closing device closes the wellhead to prevent sound waves from overflowing, so that effective gas detection is carried out, liquid level echo information is directly measured, and early warning is carried out in time to guarantee operation safety.

The application discloses a method for determining the position of drilling fluid leakage and calculating leakage parameters, which is used for finding the position of well leakage during drilling, calculating the leakage speed and leakage amount of drilling fluid, and estimating the leakage scale. The application describes the principle that the photoelectric absorption cross section Pe value of barite contained in the drilling fluid is abnormally high compared with other rocks, minerals and fluids, and the leakage position is accurately positioned by the characteristics of the high value of the Pe curve measured by the lithology density logging in the leakage well section, and the leakage speed is predicted by the correlation between the Pe logging value and the instantaneous leakage speed, and the leakage amount is calculated by combining the method of multi-mineral analysis with the actual content of barite in the drilling fluid. The method is simple and easy to operate, and the accuracy is reliable. Compared with the data provided by the field, the error of the leakage speed and the leakage amount calculated by the method is small, and the effect is good.

This application provides a multi-parameter fusion-based intelligent interactive method for intelligent drilling operations in explosion-proof environments. The method includes: obtaining a joint feature sequence dataset containing abnormal pump pressure spikes and continuous torque increases by fusing historical drilling multi-parameter time-series data and formation lithology stratification sequences; processing the joint feature sequence dataset using a long short-term memory network to obtain a predictive model capturing the temporal coupling relationship between pump pressure and torque, as well as the formation response delay effect; updating the drilling parameter control baseline using the torque-pump pressure trend envelope curve data to obtain a sequence of rotary table speed, drilling pressure, and displacement control commands targeting the pump pressure and torque coupling relationship; and feeding back the rotary table speed, drilling pressure, and displacement control command sequences to the drilling control system to obtain the actual pump pressure and torque sequences for the next well section after real-time execution. This application can effectively reduce the probability of complex accidents such as stuck pipe and lost circulation.

The invention relates to the field of oil and gas drilling, in particular to super absorbent resin, a self-adaptive elastomer and application of the super absorbent resin and the self-adaptive elastomer as an oil and gas drilling plugging agent. The super absorbent resin is a cross-linked copolymer containing a structural unit as shown in a formula (1), a structural unit as shown in a formula (2), a structural unit as shown in a formula (3) and a structural unit as shown in a formula (4), wherein 100 g of the super absorbent resin is placed in 500 g of water at the temperature of 25 DEG C, and the time for achieving the water absorption rate of 500% is 5 min or below. When the self-adaptive elastomer of the super absorbent resin is used for leaking stoppage of a stratum, the self-adaptive elastomer is not limited by multiple scales of the opening size of an underground leakage crack, and a new crack can be quickly plugged in a self-adaptive manner after the size of the crack changes. # imgabs0 #

The invention relates to a ball basket mechanism and a while-drilling leaking stoppage tool, the ball basket mechanism is located on the lower portion of the while-drilling leaking stoppage tool, a ball valve mechanism is arranged in the ball basket mechanism, and when leaking stoppage operation is not needed, a ball basket center channel is in an unblocked state; when well leakage occurs, a circulating hole of the tool is opened or closed in a ball throwing mode to conduct leaking stoppage operation, and after leaking stoppage operation is finished, thrown balls are intercepted through a ball valve mechanism and then guided into the space between a ball basket and a tool shell through a ball basket mechanism to be stored; a damping mechanism is further arranged in the plugging-while-drilling tool, and the ball valve mechanism intercepts and stores thrown balls under the matching action of the damping mechanism, so that smoothness of a central channel of the ball basket is guaranteed, and further ball throwing or cable descending operation of an underground tool below the plugging-while-drilling tool is not affected.

The invention relates to a leaking stoppage tool for a drilling leakage stratum, and relates to the field of petroleum drilling leaking stoppage, the leaking stoppage tool comprises a deformable plugging assembly, a sealing structure is arranged at the end of the deformable plugging assembly, an expansion assembly is arranged in the deformable plugging assembly, and the expansion assembly is in sliding connection with the deformable plugging assembly; and the expansion assembly is used for performing reaming deformation on the deformable plugging assembly in the self-contraction state to be in the expansion state. The anti-leakage plugging device has the advantages that effective plugging can be achieved under the condition that the diameter of a well hole is not reduced, the reliability is high, the cost is low, the period is short, and the number of used machines and tools is small, different measures can be taken for different degrees of leakage working conditions, the good anti-leakage plugging effect is achieved, and the normal drilling effect of well drilling is guaranteed.

The invention provides a long open hole malignant leakage well non-pulling-out plugging measuring integrated construction method which comprises the following steps: after leakage occurs, firstly, determining the leakage position of a long open hole well section through a leakage layer identification system, preparing a multi-grading plugging working solution according to the leakage speed, secondly, opening a plugging bypass system, interrupting a drilling system, and finally, according to the constructed long open hole well condition, determining the plugging position of the long open hole well section. And a special leaking stoppage construction process is determined, after leaking stoppage operation is completed, the leaking stoppage bypass system is closed, and the drilling system is recovered. The special leaking stoppage construction technology comprises an annular reverse extrusion technology and a direct extrusion sealing technology, the tripping time can be greatly shortened, and the plugging capacity of leaking stoppage slurry can be guaranteed. According to the method, quick and efficient treatment of well leakage is achieved on the premise that drilling is not carried out, and the existing technical problems that a leakage layer is uncertain, multiple times of invalid leakage stoppage are not achieved, large-particle leakage stoppage slurry is difficult to pump in under the condition of a drilling tool combination, the leakage stoppage time is prolonged due to multiple times of drilling, and the leakage stoppage construction technology cannot meet the leakage layer stoppage requirement to the maximum extent are solved.

A method of introducing cavitation downhole includes creating cavitation nuclei, introducing cavitation nuclei to a drilling fluid, delivering the drilling fluid downhole, and activating an acoustic source downhole. A method of preventing lost circulation includes introducing cavitation nuclei downhole, introducing lost circulation materials downhole where the lost circulation materials include a resin and microcapsules of a crosslinking agent, activating an acoustic source which may induce cavitation; and rupturing the microcapsules of the crosslinking agent to prevent lost circulation.

This invention provides a water-based drilling fluid for solidifying the wellbore in deep oil and gas wells at depths of 10,000 meters, along with its preparation method and application, belonging to the field of drilling fluid technology. The water-based drilling fluid for solidifying the wellbore in deep oil and gas wells at 10,000 meters comprises the following raw materials in parts by weight: 100 parts water, 1-5 parts modified clay shearing agent, 2-4 parts hydrophobic associating polymer flow modifier, 3-8 parts plugging agent, 2-5 parts hyperbranched polymer filtration reducer, and 1-3 parts cemented plugging wall-solidifying agent. This invention also provides a method for preparing the above-mentioned drilling fluid. In this invention, the flow modifier, plugging agent, filtration reducer, and wall-solidifying agent work synergistically to enable the drilling fluid to maintain good rheological, filtration, plugging, and inhibition properties for a long time under 240°C and saturated salt conditions, achieving a strong wall-solidifying effect. This effectively maintains the stability of the wellbore in deep oil and gas wells at 10,000 meters, preventing well collapse, lost circulation, blowouts, and other drilling complications, and can be used in drilling deep oil and gas wells at 10,000 meters.

Methods and compositions for carbon dioxide (CO2) sequestration in a wellbore (102). A method includes locating a lost circulation zone in the wellbore (102) during drilling. Methods may further include flushing drilling mud from the wellbore (102) to prepare the lost circulation zone for lost circulation mitigation and injecting a cleaning solution into the wellbore (102). Then, injecting a composition for CO2 sequestration into the wellbore (102), where the composition may include a brine solution, an alkali and / or an alkaline compound, and a catalyst. The method may further include injecting a volume of CO2 into the wellbore (102), mineralizing the alkali and / or the alkaline compound and the volume of CO2 to produce an alkali and / or alkaline carbonate compound, injecting drilling mud into the wellbore (102) and resuming drilling operations.

The invention relates to the technical field of petroleum drilling auxiliaries, and discloses a preparation method of a plugging agent for petroleum drilling, which comprises the following steps: constructing an elastic-rigid gradient composite system, respectively introducing a selective liquid absorption component into an elastic layer and a rigid layer, and preparing an osmotic gradient regulating component to regulate and control liquid phase permeation. The preparation method comprises the following steps: preparing three types of multi-stage slow-release curing components with different release rates, adding a stage-triggered release-promoting auxiliary agent and a curing synergist, and finally preparing the composite plugging agent by adopting a step-by-step mixing process. Stress adaptability is achieved through an elastic-rigid gradient structure, performance dynamic optimization is achieved through selective liquid absorption and permeation regulation and control, time sequence accurate matching is achieved through multi-section type slow-release curing, and the technical problems that a traditional plugging agent is single in hardness and prone to cracking, static performance cannot be dynamically adjusted, and curing time sequences are not matched are solved. And the loading capacity, the sealing performance and the long-term stability of the leaking stoppage layer are obviously improved.

The utility model provides a fracturing tubular column, and belongs to the technical field of methods for promoting yield by forming fractures or cracks in oil well exploitation. The fracturing string comprises an upper oil pipe, a double-pipe section and a lower oil pipe, the double-pipe section comprises an inner pipe and an outer pipe, a double-pipe annulus is formed between the inner pipe and the outer pipe, the lower oil pipe is connected with a fracturing packer set above a fracturing layer, the lower end of the lower oil pipe is open, and the lower oil pipe is communicated with the inner pipe and the upper oil pipe. The outer pipe is connected with an upper packer and a lower packer which are arranged on the upper side and the lower side of a leakage layer in a setting mode, a liquid inlet structure used for enabling equilibrium liquid in an oil sleeve annulus to enter a double-pipe annulus is arranged on the outer pipe and located above the upper packer, and a liquid outlet structure used for enabling the equilibrium liquid to be discharged out of the double-pipe annulus is arranged below the lower packer. According to the utility model, a leakage layer is isolated, so that equilibrium liquid pumped into the oil sleeve annulus can reach the upper part of the fracturing packer, the pressure of the lower part of the fracturing packer is balanced, the upper and lower pressure difference borne by the fracturing packer is reduced, and the fracturing packer is protected.

This invention relates to the field of drilling fluid auxiliary circulation systems, specifically a rotary circulation anti-sticking device comprising a central pipe with an axial flow channel and a rotary casing. The invention features a reasonable and compact structure and is easy to use. In the event of a circulation system failure, it is first connected to the drilling platform pressure manifold via a pipe joint and a high-pressure water hose, and then connected to the wellhead drill string via the rotary casing, allowing the drilling fluid to quickly recirculate. Simultaneous rotation of the drill string at this time effectively prevents sand accumulation and stuck pipe or sticking. When stuck pipe or lost circulation occurs in a horizontal well section, the cable is first passed through this device and then connected to a string of tools such as detection tools, explosive release tools, or retrieval tools before being lowered into the well. It is then connected to the drilling platform pressure manifold via a union joint and a high-pressure water hose, allowing the high-pressure drilling fluid to propel the tool string forward to a predetermined position, completing the detection, deployment, and retrieval procedures.

A system includes a drilling sub-system configured to form a wellbore from a terranean surface toward a subterranean formation by rotating a drill bit on a drill string; a drilling fluid circulation sub-system configured to circulate a drilling fluid downhole through the drill string, to and through the drill bit, into the wellbore, and uphole toward the terranean surface while the drilling sub-system drills the portion of the wellbore; and a lost circulation sub-system including a plurality of lost circulation material (LCM) pills configured to circulate, with the drilling fluid, through the drill string and the drill bit and into the wellbore in an inactive state. Each of the LCM pills is set to adjust from the inactive state to an active state to reduce at least a portion of the drilling fluid circulated into the wellbore that is lost to the subterranean formation.

The invention discloses a recommendation method of a drilling accident disposal scheme and a related device. The method comprises the following steps: acquiring data of well leakage characteristic parameters of a to-be-handled drilling accident in a target block, wherein the well leakage characteristic parameters comprise a leakage layer position, a leakage speed, a drilling fluid density, a logging curve and a drilling tool; according to the data of the well leakage characteristic parameters, a recommended scheme set is determined from a pre-constructed well leakage knowledge graph, the recommended scheme set at least comprises one drilling accident disposal scheme, and the drilling accident disposal scheme comprises sorting parameters; and according to the data of the sorting parameters of each drilling accident disposal scheme, calculating a recommended value of each drilling accident disposal scheme. Based on the recommendation function of the knowledge graph, the scheme of successful disposal of the historical well leakage accident can be quickly and accurately obtained, and the efficiency and the success rate of formulating the well leakage accident scheme are improved.

The invention belongs to the technical field of petroleum drilling, and discloses an offshore carbonate rock buried hill reservoir drilling return loss processing method, which comprises the following steps of: 1, obtaining hole and crack morphological characteristics and spatial distribution of a carbonate rock buried hill reservoir, and establishing a fracture-cavity reservoir geologic model; secondly, formation pressure distribution of the carbonate rock buried hill reservoir is obtained, and a formation pressure model of the fracture-cavity reservoir is established; and 3, correcting the formation pressure model of the fracture-cavity reservoir by using the formation balance pressure. And 4, obtaining a formation pressure coefficient according to the corrected formation pressure model, and comparing the formation pressure coefficient with the drilling fluid density to obtain a well leakage forecast. And 5, when the drilling encounters return loss, the sea water is pumped into the shaft, the height of the liquid level in the shaft is kept to be 3-5% higher than the height of the original liquid level, and continuous drilling is conducted. According to the method, the well control risk can be accurately predicted in advance, the return-loss leakage can be found and processed in time, and the safe operation of the drilling process is ensured.

The problem of lost circulation is pertinent to the oil industry. To prevent fluid loss, a lost circulation material (LCM), or more generally, a plugging material, can be used to effectively plug the fractures in the rock formation. If the fractures are in the production zone, it is also ideal to unplug them when the drilling operation is complete. Therefore, a material engineered to degrade after a desired period would be useful. In examples, a plugging material has been developed by gelling an oil-based fluid using a low molecular weight gelator, dibenzylidene sorbitol (DBS). DBS gels are robust and show plugging behavior. DBS is shown to chemically degrade in presence of an acid. Hence, a self-degrading gel can be synthesized by incorporating an acid into the system. Further, by varying the type and concentration of the acid, the degradation time of the gel can be controlled.

The invention relates to the technical field of oil exploitation, in particular to an indoor evaluation method and device for leakage-stopping drilling fluid passing through a rotary guiding system, and the method comprises the steps that when the leakage-stopping drilling fluid passes through screens at the left end and the right end of a mounting cylinder, the leakage-stopping drilling fluid generates different pressures on the left end and the right end of the screens; respectively acquiring pressure data of corresponding positions through a first acquisition probe and a second acquisition probe of the pressure sensor; calculating the pressure amplification of the collected pressure data by using the following formula; and evaluating the capability of the over-rotation steering drilling tool screen through the pressure amplification. The device is used for simulating the process that the drilling fluid circularly passes through the screen of the rotary steering drilling tool, the function of preferentially screening the drilling-following plugging drilling fluid for the rotary steering drilling tool indoors is achieved, the experiment cost and risk are remarkably reduced, and the problems that the experiment cost of the capability of the drilling-following plugging drilling fluid passing through the rotary steering drilling tool on site is high, and the risk is large are solved. And the blank of the indoor screening and evaluation technology of the plugging-while-drilling drilling fluid for the rotary steering drilling tool is filled.

Techniques for controlling lost circulation while drilling include while drilling a wellbore, encountering a high-loss circulation zone by a bottomhole assembly; responsive to encountering the high-loss circulation zone, releasing a first lost circulation media retained within the bottomhole assembly; and receiving a second lost circulation media, by the bottomhole assembly, from circulation fluid circulated from a topside facility.

A lost circulation detection device includes a first detection member and a second detection member, a first signal transmitter and a first signal receiver are disposed on the first detection member, and the first signal transmitter transmits a signal along an axial direction of a rockshaft so that the first signal receiver acquires data information of drilling fluid in the axial direction of the rockshaft; a fluid channel penetrating through the second detection member is disposed in the second detection member, and the fluid channel is configurable to be in communication with the rockshaft; a second signal transmitter and a second signal receiver are disposed oppositely on two sides of the fluid channel, and the second signal transmitter transmits a signal along a center line of a second accommodating groove, so that the second signal receiver acquires data information of drilling fluid in a circumferential direction of the rockshaft.

The application discloses a kind of overflow leakage monitoring methods, systems and devices of throttling drilling.The method includes the instantaneous outlet flow of mud in the process of throttling drilling is acquired in real time, according to preset time sliding window, the moving average sequence of instantaneous outlet flow of current time is determined, and the moving standard deviation of instantaneous outlet flow of current time is determined based on moving average sequence;According to moving standard deviation, overflow leakage dynamic early warning interval is set;According to preset time sliding window, the difference of moving average of current time instantaneous outlet flow and the moving average of next time instantaneous outlet flow is determined;Difference is judged whether it accords with overflow leakage dynamic early warning interval.Can eliminate the influence of abnormal fluctuation of instantaneous outlet flow on overflow leakage early warning result, dynamically adjust the early warning interval of overflow leakage, and more timely and accurately carry out overflow leakage early warning in the process of throttling drilling.

The invention discloses an annulus liquid level monitoring system and method. The system comprises a nitrogen generation pressure control module, a sound wave control module, a liquid level monitoring module and an actuator control module, the nitrogen generation pressure control module is connected with a drilling gas source, the sound wave control module is arranged on an annular liquid level wellhead rotary blowout preventer four-way joint, and the liquid level monitoring module and the actuator control module are arranged on a pressure control drilling operation table. According to the technical scheme of the embodiment, the annulus liquid level monitoring system is constructed by integrating the nitrogen generation pressure control module, the sound wave control module, the liquid level monitoring module and the actuator control module, and the system is integrated on the pressure control drilling equipment, so that continuous monitoring of the drilling annulus liquid level under the working condition of well leakage and return in the pressure control drilling process is achieved, and the drilling efficiency is improved. Meanwhile, according to the annulus liquid level height and the real-time annulus liquid level bottom hole pressure, actuator control parameters and grouting parameters are guided in real time, so that the problem that the annulus liquid level drops due to return loss in the drilling process is quickly responded, and the well control safety is improved.

A well-killing system for ultra-deep well drilling with co-existence of overflow and lost circulation is provided. An upper part of a wellhead blowout preventer is connected to a first mud pump and a lost circulation material mud tank through a pipeline, a first three-way control valve, and a second three-way control valve. A lower port of the second three-way control valve is connected to a second mud pump and a mud pit. A lower port of the first three-way control valve is connected to a first well-killing fluid tank and a second well-killing fluid tank. A gas-liquid separation tank is connected to a side of a wellhead device. A first pressure sensor and a first flowmeter are provided on a left port of the first three-way control valve. A second pressure sensor and a second flowmeter are provided at a left port of a third three-way control valve.