15 results about "Deepwater drilling" patented technology

The invention discloses a drilling tool for underwater installation and recovery of a top locking assembly and a construction method.The tool comprises a mandrel, an outer body, a release ring and a recovery ring, the outer body is in threaded connection with the mandrel through one corresponding step face, and the other step face of the mandrel is sleeved with the release ring in a threaded mode; a C-shaped recycling ring is arranged in the first containing groove, the recycling ring is bounced off or compressed through vertical movement of the release ring, and the recycling ring is clamped to the top locking assembly to recycle the top locking assembly when bounced off. The mandrel is provided with a first transmission block and a second transmission block which both protrude out of the mandrel, and the first transmission block and the second transmission block are correspondingly arranged in the grooves of the top locking assembly in a matched mode. The top locking assembly can be lowered, installed, adjusted in clearance and locked through one-time drilling, and at least one-time drilling is saved; and the underwater unlocking and recycling function of the top locking assembly is integrated, additional special tool allocation is reduced, tool allocation is optimized, the deepwater drilling operation cost is saved, and the operation efficiency is improved.

The invention belongs to the technical field of deepwater drilling, and discloses a deepwater drilling system and a deepwater drilling method. The deepwater drilling system comprises a drilling ship, a waterproof unit, a regulation and control device, a blowout prevention device and a drilling device. The upper end of the waterproof unit is connected with a drilling ship and provided with a first penetrating channel. The regulation and control device is arranged at the lower end of the waterproof unit and provided with a plurality of connecting channels. The connecting channel has an open state and a closed state, and in the open state, the first penetrating channel communicates with the outside through the connecting channel. And the blowout preventer is arranged at the wellhead and is connected with the waterproof unit. And the first penetrating channel can be communicated with a second penetrating channel of the blowout preventer. The drilling device is arranged on the drilling ship and penetrates through the first penetrating channel, the second penetrating channel and the well mouth. The well drilling device is provided with a conveying channel, and drilling fluid can be conveyed to the lower end of the well drilling device through the conveying channel. When the system is used for drilling operation, the pressure borne by a stratum at a wellhead can be effectively reduced, and stratum fracturing is avoided.

The present application relates to the technical fields of deepwater drilling and workover technology of offshore oil engineering, and particularly relates to a joint for emergency release of a deepwater light drilling and workover underwater riser and an operating method thereof. The emergency release joint comprises an upper joint body and a lower joint body which are mutually butted. A locking assembly composed of a clamp and a support ring is arranged on the periphery of the butt joint, and an electromagnetic drive assembly is correspondingly arranged. Upper and lower blowout preventer modules are arranged on both sides of the butt joint along the fluid passage in axial opposition. The electromagnetic drive assembly is used to drive the support ring to move between two working positions, so as to control the locking or releasing of the clamp on the butt joint. In operation, the upper and lower blowout preventer modules are first controlled to be closed, and then the mechanical locking is released to realize the release of the joint. After reconnection, the mechanical locking is restored and the fluid passage is opened. The scheme is suitable for emergency release and subsequent reconnection of the deepwater riser under abnormal working conditions.

The invention belongs to the technical field of deepwater oil and gas field drilling gas cut monitoring, and particularly relates to a deepwater drilling gas cut monitoring method. According to the monitoring method, nonlinear dynamic characteristics of ultrasonic signals are extracted through multi-scale fuzzy divergence entropy, and a gas content value is obtained based on inversion of a support vector machine model subjected to sample training, so that quantitative monitoring and early warning of tiny changes of the gas content are realized; compared with an existing deepwater drilling gas cut monitoring method, the method has the remarkable advantages in the aspects of monitoring precision, dynamic response characteristics, noise interference resistance and the like, and accurate recognition and real-time quantitative monitoring of early weak gas cut signals can be achieved. A deepwater drilling gas cut monitoring method comprises the following steps that ultrasonic echo signals of gas-liquid two-phase flow are collected; extracting a multi-scale fuzzy divergence entropy value in the ultrasonic echo signal; and inputting a feature vector in the multi-scale fuzzy divergence entropy into the trained support vector machine classification model to obtain a gas content recognition result.

This invention discloses an integrated logging-while-drilling (LOD) and measurement drill string assembly, relating to the field of oil and gas drilling engineering technology. It provides a series connection scheme for core protective drill string components, offering two switchable configurations: one with a mud motor and one without. Both configurations consist of an azimuth density neutron logging sub, a bidirectional communication power supply sub, an acoustic logging sub, a resistivity logging sub, an upper connecting sub, a flexible sub, a lower connecting sub, an azimuth gamma logging sub, and a steering actuator connected in series according to a fixed logic. The configuration with a mud motor only requires adding a mud motor at a designated location to complete the structural switch, without changing the series connection of the remaining subs. This assembly scheme is applicable to various drilling scenarios such as offshore exploration and development, deepwater drilling, complex directional wells, highly deviated wells, and horizontal wells. It enables integrated operations of geological steering, formation evaluation, and wellbore stability analysis during drilling, effectively improving drilling efficiency and reducing operational risks.

The present application belongs to the technical field of gas invasion monitoring of deepwater oil and gas field drilling, and particularly relates to a deepwater drilling gas invasion monitoring method. The monitoring method extracts the nonlinear dynamic characteristics of ultrasonic signals through multi-scale fuzzy divergence entropy, and obtains the gas holdup value based on the support vector machine model trained by samples, thereby realizing quantitative monitoring and early warning of the small change of gas holdup. Compared with the existing deepwater drilling gas invasion monitoring method, the present method has significant advantages in monitoring accuracy, dynamic response characteristics and anti-noise interference performance, and can realize accurate identification and real-time quantitative monitoring of early weak gas invasion signal. A deepwater drilling gas invasion monitoring method comprises the following steps: collecting ultrasonic echo signals of gas-liquid two-phase flow; extracting multi-scale fuzzy divergence entropy values in the ultrasonic echo signals; inputting the feature vectors in the multi-scale fuzzy divergence entropy values into the trained support vector machine classification model to obtain the gas holdup recognition result.

The invention discloses low-C-high-Mn-Ni-Cu corrosion-resistant L555-grade subsea pipeline steel and a preparation method thereof, belongs to the technical field of subsea pipeline steel manufacturing, and aims to solve the technical problem that existing L555-grade pipeline steel is poor in corrosion resistance and low-temperature toughness. The low-C high-Mn-Ni-Cu corrosion-resistant L555-grade subsea pipeline steel provided by the invention is prepared from the following components in percentage by mass: 0.031 to 0.045 percent of C, 2.00 to 2.10 percent of Mn, 0.15 to 0.22 percent of Si, 0.60 to 0.80 percent of Ni, 0.31 to 0.40 percent of Cu, 0.15 to 0.20 percent of Cr, 0.020 to 0.030 percent of Nb, 0.010 to 0.015 percent of Ti, less than or equal to 0.008 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.004 percent of N and the balance of Fe and inevitable impurities. The L555-grade subsea pipeline steel provided by the invention has good corrosion resistance and low-temperature toughness, and is suitable for deepwater drilling riser main pipes and other pressure-bearing service components.

The split type suction pile comprises an upper half part and a lower half part, the top of the upper half part is designed to be sealed, the bottom of the upper half part is designed to be open, a suction pump butt joint opening and an exhaust port are formed in the top of the upper half part, a reserved well opening is formed in the center of the interior of the upper half part, and the top of the lower half part is an open type horn mouth. The bottom of the lower half portion is open, a butt joint step and an anti-rotation structure are arranged in the lower half portion, the bottom of the upper half portion can enter the lower half portion and is clamped through the butt joint step and the anti-rotation structure, and hoisting structures are arranged on the outer wall of the upper half portion and the outer wall of the lower half portion respectively. According to the method, the underwater wellhead with excellent stability can be built on the ultra-deep water soft soil surface layer, and follow-up installation of equipment such as a Christmas tree is facilitated.

This invention relates to a method for preparing and applying a core-shell structured silica plugging agent with a rigid inner structure and a flexible outer structure for marine drilling fluids, belonging to the field of deepwater oil and gas drilling. This invention uses N-vinyl-2-pyrrolidone, dimethyl diallyl ammonium chloride, acrylamide, and 2-acrylamide-2-methylpropanesulfonic acid polymerized and grafted onto the surface of nano-silica to form a core-shell structured silica plugging agent with a rigid inner structure and a flexible outer structure. By utilizing the rigid plugging of nanomaterials and the flexible plugging of polymer deformation, this method effectively seals the micro- and nano-pores of shale and mudstone, thereby maintaining wellbore stability. Simultaneously, it effectively inhibits the secondary formation of hydrates, improving the safety and efficiency of deepwater drilling. Furthermore, the plugging agent of this invention reduces the need for large amounts of thermodynamic inhibitors, saving costs and possessing environmentally friendly properties.

The present application relates to a kind of marine drilling fluid with the preparation method and application of inner rigid outer soft core-shell structure nano zinc oxide blocking agent, the present application is polymerized by acrylamide, 2-acrylamide-2-methylpropane sulfonic acid and grafted on the surface of modified nano zinc oxide, and the micro-morphology is formed for the core-shell structure zinc oxide blocking agent of inner rigid outer soft;With the rigid plugging of nanometer material and the flexible plugging of the deformation filling of high molecular polymer, soft and hard combination, high efficient plugging shale micro-nanopore, further maintain wellbore stability, while effectively inhibit the secondary generation of hydrate, improve the safety and efficiency of deepwater drilling, preparation method is simple, raw material is cheap and easy to obtain, high efficiency and environmental protection;And good compatibility with drilling fluid.Effective plugging of micro-nanopore in deepwater formation can prevent drilling fluid filtrate from invading the formation, reduce reservoir hydration dispersion and improve the safety of deepwater drilling and production process.

The invention discloses a control method and system of a deepwater drilling device, electronic equipment and a storage medium, and belongs to the technical field of drilling technologies. The deepwater drilling device comprises a riser pressure manifold, a drill rod, a marine riser and a rotation control device, the rotation control device is installed on the upper portion of the marine riser, a fluid conveying line between the rotation control device and the circulating pool comprises a first line and a second line which are connected in parallel, and the first line comprises a first return pipeline. The first line comprises a first return pipeline and a riser pressure manifold which are connected in series, the second line comprises a second return pipeline and a choke manifold which are connected in series, a first drilling pump is arranged in the first line, a second drilling pump is arranged in the second line, a third drilling pump is arranged in the riser pressure manifold, and the equivalent circulation density control method in deepwater drilling comprises the steps that the current working condition of the deepwater drilling device is determined; and selecting a corresponding control mode according to the current working condition. According to the method, the wellbore pressure can be effectively controlled, and the safety and efficiency of deepwater drilling are improved.

This invention provides a wellbore gas invasion monitoring device and oil and gas drilling equipment. The tubing string is installed in the middle section of the drill collar near the drill bit and has an internal support component. A first fluid channel on the internal support component allows drilling fluid in the drill string to flow through, enabling the drilling fluid to flow through the drill pipe and tubing string to the drill bit and finally into the wellbore. A circulation pump drives the drilling fluid in the wellbore annulus to flow sequentially through an inlet channel, a second fluid channel, and a outlet channel back into the wellbore. When flowing through the second fluid channel, the dissolved gas in the drilling fluid diffuses through a gas-liquid separator to a gas detection component for pressure and temperature monitoring. The pressure and temperature data are processed by a data transmission component and uploaded to the surface. The surface data processing device can calculate the pressure data of dissolved gas in the drilling fluid in real time using a corresponding calculation model to achieve real-time monitoring of pressure changes of dissolved gas in the drilling fluid, thereby quickly determining the early stage of bottom hole gas invasion and providing early warning for deepwater drilling safety.

This invention discloses a method and apparatus for evaluating the pressure resistance of density-reducing agents in deep-water drilling fluids. The evaluation apparatus includes a pressure-resistant intermediate container, a pressurizing device, an intermediate partition, and a fragment collection tray. The intermediate partition is movably disposed inside the container to press the density-reducing agent below the liquid surface, ensuring complete immersion. The fragment collection tray is detachably disposed at the bottom of the container to collect the broken-up density-reducing agent. This invention also provides an evaluation method in which the density-reducing agent is immersed in the liquid, a set pressure is applied by the pressurizing device, the pressure is released, fragments are collected, and the breakage rate is calculated. This invention can realistically simulate the stress state of density-reducing agents in deep-water drilling fluid environments, achieving stable pressurization and accurate collection, accurate breakage rate calculation, and simple operation. It is suitable for evaluating the pressure resistance of low-density glass microsphere-type density-reducing agents under different water depth conditions.

The invention discloses a quick-connection deepwater expansion type surface conduit, which belongs to the technical field of deepwater conduits, and is characterized in that male joints and female joints at two ends of the surface conduit are in precise threaded connection, so that a plurality of conduits can be quickly assembled and disassembled without complicated tools, and the deepwater drilling operation efficiency is remarkably improved. The shape memory alloy ring triggers the self-expansion outer layer to uniformly expand in a deepwater low-temperature environment, the internal structure of the self-expansion outer layer expands to push the self-expansion outer layer to form concave-convex close contact with a soil body, the contact area is greatly increased, the inner layer metal lining provides rigid support, the hydraulic supporting piece prevents the self-expansion outer layer from excessively deforming under high pressure, and the self-expansion outer layer is protected from being damaged. Meanwhile, vibration is absorbed through hydraulic damping, looseness of the combined part is avoided, the lateral friction force, bending resistance and underwater wellhead bearing capacity of the surface layer guide pipe are remarkably improved, and the stable wellhead structure is guaranteed.

The invention discloses a heat energy utilization system, a using method and a ship. The heat energy utilization system comprises an equipment cooling circulation pipeline and a hot cooling medium output. Cold seawater flows in the seawater pipeline; the temperature difference energy power generation module comprises a first heat exchange area, a second heat exchange area and a working medium circulation loop, the equipment cooling circulation pipeline correspondingly exchanges heat with the first heat exchange area, the seawater pipeline correspondingly exchanges heat with the second heat exchange area, and the first heat exchange area and the second heat exchange area are arranged in the working medium circulation loop in series. The liquid working medium absorbs heat, the gaseous working medium releases heat, and the liquid working medium and the gaseous working medium convert forms in the working medium circulation loop and convert energy into electric energy. The use method comprises a cooling mode, a maximum power generation mode, a frequency modulation mode and an emergency mode, and the ship applicable heat energy utilization system and the use method thereof can be a deepwater drilling ship.