6 results about "Wellbore instability" patented technology

This invention provides a method for preparing a polyamine that combines inhibition and solid-phase cleaning effects. Compared with existing technologies, the polyamine prepared by this invention exhibits better inhibitory and solid-phase cleaning effects under high-temperature conditions, and also demonstrates better compatibility in drilling fluids. Its application in drilling fluids can effectively solve the wellbore instability problem in highly water-sensitive shale formations, and effectively avoid drilling fluid slurry formation problems caused by drill cuttings hydration, thus ensuring wellbore stability and drilling fluid cleanliness.

This invention belongs to the field of natural gas extraction technology in deep thin coal and rock formations. It discloses a directional anti-sticking drill string assembly and drilling method for horizontal wells in deep thin coal and rock formations. A closed-loop control system is formed between the drill bit trajectory control mechanism and the wellbore dressing and anti-sticking mechanism, encompassing near-bit high-precision sensing, real-time data transmission while drilling, surface analysis feedback control, active downhole directional correction, and synchronous wellbore dressing and protection. Multi-directional gamma sensors positioned near the drill bit provide high-resolution formation information; the bend structure of the downhole power drill string provides the direction of the wellbore trajectory; the non-magnetic bearing section ensures the stability of measurement while drilling and the reliability of communication; the surface control unit enables real-time decision-making and trajectory correction; and the wellbore dressing and anti-sticking mechanism simultaneously improves wellbore stability and cuttings carrying capacity. This significantly enhances the drilling throughput and resistance to coal seam collapse in complex sections of thin coal and rock formations while ensuring trajectory controllability, reducing the risk of sticking due to wellbore instability and cuttings accumulation.

This invention discloses an inhibitory water-based foam drilling fluid system to solve the wellbore instability problem currently existing in foam drilling. The system comprises 0.5%-1.0% fluorocarbon foaming agent, 0.2%-1.0% inhibitor, 0.04%-0.2% foam stabilizer, 0.2%-0.4% thickener, 1.0%-5.0% bentonite, and water as the balance. The fluorocarbon surfactant is a fluorocarbon surfactant containing a quaternary ammonium salt cationic structure, the inhibitor is a small-molecule amine salt structure inhibitor, and the large-molecule foam stabilizer is one or more combinations of starch, cellulose, and polyacrylamide. The foaming agent provided by this invention, when applied in foam drilling, possesses both strong foaming and inhibitory properties.

This invention relates to the field of drilling fluid treatment agents, and discloses a formulation with reduced filtration loss properties, its preparation method, and its application. The method includes: (1) mixing an organic solvent, an oil-phase matrix material, and an organic hydrophilic modifier to carry out a first modification reaction, wherein the oil-phase matrix material is selected from asphalt and / or resin; (2) adding graphene material to the system obtained in step (1) to carry out a second modification reaction. The formulation prepared by this method can not only quickly form an oil film on the wellbore to seal cracks, but can also be widely used in well sections prone to wellbore instability at 60-120℃, while also effectively improving the lubrication performance of drilling fluids.

The present application belongs to the technical field of oil and gas drilling engineering, and particularly relates to a polymer-coated inhibitor for strong inhibition drilling fluid and a preparation method thereof; the inhibitor is prepared by aqueous solution polymerization of acrylamide, acrylamidomethylpropane sulfonic acid, dimethyldiallylammonium chloride, vinyltrimethoxysilane and two novel inorganic modified compounds. The two inorganic modified compounds are a titanate intercalated magnesium aluminum tin silicate nanocomposite and a polyoxometalate grafted rare earth doped cerium dioxide nanorod, respectively. The former is prepared by coprecipitation and intercalation reaction, and the latter is prepared by hydrothermal synthesis and graft modification. The present application significantly improves the hydration inhibition capacity for shale, and can still maintain stable coating effect in high temperature and high salt environment, effectively solving the problem of wellbore instability. The preparation method is simple in process, the raw materials are all commercially available, and is suitable for industrial production, and has a broad application prospect in the field of water-based drilling fluid.

The application provides a thick alluvium controlled drilling trajectory optimization method, system and storage medium, the method comprises the following steps: generating a smooth candidate drilling trajectory by a first derivative continuous spline interpolation function, establishing a three-dimensional geomechanics model coupled with stratum parameters, and setting the wellbore stress meeting the rock strength criterion as a first hard constraint; performing probability modeling on geological risks to delimit boundaries, setting a safety distance as a second hard constraint, constructing a weighted spatial anisotropic drilling comprehensive cost objective function, fusing a trajectory length, a torque drag and a wellbore instability risk index, adopting a global optimization algorithm to minimize the comprehensive cost under the double constraints, solving optimal control point parameters, and interpolating to generate an optimized drilling trajectory.