10 results about "Casing wear" patented technology

The invention belongs to the technical field of special maintenance of reactor bodies, and particularly relates to an electric spark machining head for cutting a sleeve flange in a narrow space. Comprising an expansion mechanism, a fine adjustment jacking mechanism, a rotating mechanism, an electrode and a radial servo feeding mechanism, the rotating mechanism provides rotary motion of the electrode and drives the electrode to conduct rotary machining, the radial servo feeding mechanism provides radial feeding motion of the electrode, and the expansion mechanism plays a role in fixing and positioning. The fine adjustment jacking mechanism drives the rotating mechanism, and the radial servo feeding mechanism drives the electrode to do up-down, rotating and radial feeding movement. The method has the beneficial effects that the damage to the pressure-bearing boundary of the primary loop of the nuclear power unit can be avoided under the condition that the heat sleeve is worn out of limits and needs to be replaced aiming at the common problem of wear settlement of the heat sleeve of the control rod driving mechanism of the nuclear power unit, and the whole dismantling work has relatively high safety, reliability and economical efficiency; and greater benefits can be created for the operation of a power plant.

The utility model belongs to the technical field of casing centralizers, and particularly relates to an integral double-arch casing centralizer which comprises a centralizer body, the centralizer body comprises connecting pipes, a first metal sheet designed in an arch shape is arranged between the upper connecting pipe and the lower connecting pipe, and a second metal sheet is arranged between the upper connecting pipe and the lower connecting pipe. The inner side of the first metal sheet is provided with an arc-shaped second metal sheet, the inner side of the second metal sheet is provided with an adjusting assembly, the outer side of the adjusting assembly is provided with a pulley, and the outer side of the second metal sheet is provided with a protection plate. The centralizer is reasonable in design, simple in structure and convenient to machine, the use functionality of equipment parts can be improved, the overall use strength of the equipment parts can be improved, the use condition of the outer side of the centralizer can be adaptively adjusted according to different pipe fitting conditions so as to adapt to the advancing process, a sleeve can be conveniently and stably fixed, and the service life of the centralizer is prolonged. And normal and stable follow-up work is guaranteed, the possibility of abrasion of the sleeve is reduced, and the use requirement is effectively met.

An anti-splashing type downhole oil casing abrasion experiment platform is characterized in that a linear reciprocating motion driving mechanism and a pressure loading mechanism are arranged on a workbench, an upper sample holder is arranged on one side of the linear reciprocating motion driving mechanism, a lower sample moving frame is arranged in the upper sample holder, and a sensor check block is arranged between the upper sample holder and the linear reciprocating motion driving mechanism; a friction force sensor is arranged between the sensor check block and the upper sample frame, a slurry box is arranged below the lower sample moving frame, and the slurry box is communicated with a slurry circulating system; the friction force sensor is horizontally mounted between the upper sample holder and the baffle, so that the positive pressure loaded by the pressurizing mechanism is perpendicular to the friction force, and the friction force is transmitted through the upper sample holder, and the situation that the measurement precision is reduced due to the fact that the friction force sensor is subjected to an additional bending moment when the positive pressure is loaded by the pressurizing mechanism is prevented; interference of positive pressure on friction force measurement is avoided, and the device has the advantage of being high in measurement precision.

The disclosure presents solutions for determining a casing wear parameter. Image collecting or capturing devices can be used to capture visual frames of a section of drilling pipe during a trip out op

The invention discloses a method for machining the surface of a hard inner hole of a wear-resistant bushing of a bearing type casing. The method comprises the following steps of: 1, controlling the allowance and cylindricity before the wear-resistant bushing is assembled; step 2, assembling the wear-resistant bushing; step 3, grinding, polishing, clamping and aligning the support type casing, firstly roughly aligning a reference circle for the hard inner hole of the wear-resistant bushing, and then finely aligning the reference circle for the hard inner hole of the wear-resistant bushing; fourthly, rough grinding, fine grinding and accurate grinding are sequentially adopted for grinding machining, the grinding mode is spiral grinding and polishing, and the shape tolerance of the hard inner hole of the wear-resisting bush of the bearing type casing is guaranteed; and fifthly, rough polishing, fine polishing and fine polishing are sequentially adopted for polishing machining, the polishing mode is spiral polishing, and the surface covering roughness of the hard inner hole of the wear-resisting bush of the bearing type case is guaranteed. According to the method, the problem that the surface shape tolerance and the surface roughness of the hard inner hole of the wear-resistant bushing of the bearing type casing are difficult to guarantee is solved, the machining efficiency is improved, and the machining cost is reduced.

The utility model belongs to the technical field of oil field downhole tools, and particularly relates to a casing milling anti-rotation type composite material packer which comprises a center flow channel formed by sequentially connecting an upper connector, an upper center pipe, a lower center pipe and a lower connector, a setting mechanism, a sealing locking mechanism and an anti-rotation structure. According to the setting mechanism, a setting piston is hydraulically driven to compress a rubber barrel assembly to achieve sealing, and a locking claw is driven to expand outwards and be anchored to the inner wall of the sleeve. The anti-rotation structure is arranged between the center pipe and the outer sleeve assembly and comprises a flat key and a plurality of anti-rotation screws, the flat key is used for limiting circumferential relative rotation and allowing axial relative sliding, and the anti-rotation screws are screwed into the outer sleeve assembly in the radial direction and matched with the center pipe to form auxiliary anti-rotation points. By means of a composite anti-rotation system formed by the flat key and the anti-rotation screw, torque can be effectively transmitted during casing milling, the packer is prevented from rotating along with the milling shoe, casing milling efficiency is remarkably improved, abrasion of the milling shoe and the casing pipe is reduced, and the technical problem that an existing casing milling packer is prone to rotating along with the milling shoe in the removing process is solved.

The invention discloses a method and device for determining the bearing boundary of a shaft before oil testing. The method comprises the steps that the stress state of a drill column unit is determined, the contact force between the drill column unit and a casing pipe is determined according to the stress state, and the drill column unit comprises a drill column connector and drill column sections located at the two ends of the connector; the sleeve abrasion depth of the sleeve is determined according to the contact force, the sleeve residual strength of the abrasion area of the sleeve is determined according to the sleeve abrasion depth, and the sleeve residual strength comprises residual internal pressure resistance strength, residual external extrusion resistance strength and residual tensile strength; according to the internal pressure, the external pressure, the axial force, the wear depth of the sleeve and the residual strength of the sleeve, a biaxial stress ellipse of the sleeve is drawn under a target coordinate system, and the biaxial stress ellipse is displayed, so that the problems that the wear condition of the sleeve is evaluated depending on manpower and experience and the residual strength of the sleeve is inaccurate in related technologies are solved; and the safety, the reliability and the operation efficiency of drilling operation are improved.

The utility model discloses a kind of anti-casing abrasion milling devices, belong to petroleum and natural gas well drilling engineering technical field, and its technical scheme main points include main body cylinder, the top and bottom of the main body cylinder are provided with drill rod joint, the outside of the main body cylinder is evenly provided with three groups of self-adapting centralizing mechanism along circumference, the application is by being provided with main body cylinder, drill rod joint, self-adapting centralizing mechanism and automatic controller, three groups of self-adapting centralizing mechanism distributed in circumference, can be according to the pressure sensor signal received by automatic controller, drive telescopic cylinder flexible adjustment, face casing diameter change, complex curvature well section, telescopic cylinder drives centralizing wheel frame, tungsten carbide centralizing wheel dynamically changes position and angle, accurately adapts different well conditions, stably restricts drill string centering, solve the problem that traditional fixed size centralizing tool adaptability is poor, cannot stably restrict drill string, effectively avoid drill string eccentric friction casing, guarantee wellbore operation safety.

The present disclosure relates to a kind of H2S and CO2 level well casing residual strength evaluation method containing, based on Newton microelement method, for multiple factors such as real borehole trajectory, drilling fluid viscous friction and drilling parameter, analysis model of accurately describing the contact force of drill pipe and casing is established;Based on four-order Runge-Kutta, the analysis model is solved, and the contact force size and distribution of drill pipe and casing at different well depth are obtained;Using energy transfer theory and White-Fleisher wear theory, the thickness reduction of casing after wear is determined;Based on indoor corrosion test data, the thickness reduction caused by casing corrosion is determined;The total thickness reduction caused by casing wear and corrosion is superimposed, and the residual strength of technical casing after wear and corrosion is calculated;The method of the present application has higher precision and applicability for the residual strength evaluation and full life cycle integrity evaluation of large displacement well and horizontal well casing containing acid gas.

The invention relates to the field of well drilling construction, in particular to a casing screwing-on quality control device and a casing screwing-on method.The casing screwing-on quality control device comprises a hydraulic tong used for fixing a casing, a wellhead elevator used for fixing an upper-stage casing, a limiting part and a detecting part; the limiting part is arranged on one side of the wellhead elevator, and the hydraulic tongs are arranged on the side, close to the wellhead elevator, of the limiting part. The limiting part is arranged in a swinging manner; the limiting part can drive the hydraulic tongs to move by a preset distance in the direction close to or away from the wellhead elevator. The detection part is arranged on one side of the well mouth elevator and used for detecting the screwing-on state of the casing pipe and an upper-stage casing pipe. The horizontal state of the casing pipe can be adjusted through the limiting part, the casing pipe is driven to be aligned with the upper-stage casing pipe, the screwing-on state of the casing pipe and the upper-stage casing pipe can be detected through the detection part, the screwing-on efficiency is improved, meanwhile, the screwing-on precision is guaranteed, the screwing-on quality is improved, and the situations that the casing pipe is abraded and scrapped and falls into a well are avoided.