6 results about "Deepwater drilling" patented technology

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.

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.

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.

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.