137 results about "Short radius" patented technology

A coronary access catheter system simplifies the insertion of objects into distal branches of the coronary sinus. The system incorporates a real-time forward-imaging means to view the os and the branches of the coronary sinus. Preferably, the catheter uses near-infrared light as the forward-imaging means, but it could also include ultrasound or electromagnetic transducer. As the image is viewed, the catheter tip can be steered into the coronary sinus os and deflected in a tight radius bend on the distal end to navigate the short radius, right angle turns found in the coronary sinus branches. At that point, a flexible sheath can be placed over the guide catheter or objects such as guidewires can be inserted into channels of the guide catheter. The system consists of a catheter and image acquisition unit, which displays the forward image.

A urological guidewire includes a core formed of a first metallic material and extending toward an end of the guidewire. A coil having a plurality of convolutions is disposed around the core at the end of the guidewire, the coil being formed of a second metallic material different than the first metallic material. A mechanical interlock is formed to inhibit separation of the different materials forming the coil and the core. The mechanical interlock may include an enlargement at the end of the core and a bonding material fixing the enlargement to the coil. The convolutions may include a penultimate convolution with a first radius of curvature and an ultimate convolution having a second, shorter radius of curvature to form a bridge. In this case, portions of the core can be bent back on themselves and directed over or around the bridge to form the mechanical interlock.

A urological guidewire includes a core formed of a first metallic material and extending toward an end of the guidewire. A coil having a plurality of convolutions is disposed around the core at the end of the guidewire, the coil being formed of a second metallic material different than the first metallic material. A mechanical interlock is formed to inhibit separation of the different materials forming the coil and the core. The mechanical interlock may include an enlargement at the end of the core and a bonding material fixing the enlargement to the coil. The convolutions may include a penultimate convolution with a first radius of curvature and an ultimate convolution having a second, shorter radius of curvature to form a bridge. In this case, portions of the core can be bent back on themselves and directed over or around the bridge to form the mechanical interlock.

The invention relates to a method for the sidetrack drilling of radial branch well bores through hydraulic jet and a device thereof. The device comprises a first oil pipe and a second oil pipe, wherein the external diameter of the first oil pipe is smaller than the internal diameter of a sleeve arranged inside an oil well; and the end part of the first oil pipe is connected with a deflector. The external diameter of the second oil pipe is smaller than the internal diameter of the first oil pipe; and the second oil pipe is connected with a sidetrack drilling tool carrying out the sidetrack drilling of the radial branch well bores. The external dimensions of the deflector are smaller than the internal diameter of the sleeve; the deflector has a through passage communicated with the top and the side wall; and the sidetrack drilling tool is deflected to the side wall from the top of the deflector via the through passage. The device overcomes well-known defects, can correctly and conveniently fix the deflector at a set stratum position and have a correct drilling position. The device is particularly suitable for the sidetrack drilling of a well with an ultra short radius, can operate conveniently on a ocean platform, thereby avoiding the downhole accidents caused by a downhole tool, effectively shortening the drilling cycle, saving the drilling cost, reducing the labor intensity ofworkers, improving the construction effects and having great market potential.

A lightweight and durable drill pipe string capable of short radius drilling formed using a composite pipe segment formed to include tapered wall thickness ends that are each defined by opposed frustoconical surfaces conformed for self aligning receipt and intimate bonding contact within an annular space between corresponding surfaces of a coaxially nested set of metal end pieces and a set of nonconductive sleeves. The distal peripheries of the nested end pieces and sleeves are then welded to each other and the sandwiched and bonded portions are radially pinned. The composite segment may include imbedded conductive leads and the axial end portions of the end pieces are shaped to form a threaded joint with the next pipe assembly that includes contact rings in the opposed surfaces of the pipe joint assembly, the contact of which is effected by either piercing with a pointed contact from one end into the other to connect the corresponding leads across the joint or contacting opposed rings in each end.

One or more closed perimeter openings are formed in the compression area of a flange of a member that is to be bent transversely to the flange. The member is bent along a transverse bend line, and the flanges are bent inwardly on themselves. The bending of the member along the transverse bend line is done with a great force, and because portions of the side flanges are supported on their distal and proximal side, the material of the side flanges in the compression area plasticizes and flows into the closed perimeter opening, causing them to deform. Because the closed perimeter opening or openings are present, the side flanges are compressed in a more controlled manner, reducing cracking, wrinkling and thinning during the bending of the member along the transverse bend line.

The invention relates to an ultra-short radius radial well-drilling tool system used for well drilling and completion operations in oil production and comprising a sleeve perforating system and a high-pressure ejection system. The ultra-short radius radial well-drilling tool system comprises a lifting joint, an elbow joint, an upper joint, a rotating joint, a thrust ball bearing, a single-row centripetal ball bearing, a base, a central tube, a sucker rod, an oil pipe, a screw rod, a high-pressure hose, an upper fixed joint, an upper joint of a universal joint, a rail groove, a universal joint, a shaft pin, a cruciform joint, a drill plate, a drilling tool joint, a drilling tool, a lower joint, a high-pressure nozzle and a locating anchor. The high-pressure ejection system comprises a ground high-pressure pump, the sucker rod, the high-pressure hose, the rail groove and the locating anchor. Firstly, the sleeve perforating system is used for drilling a hole with the diameter being not less than 25 mm in the wall of a sleeve at the design depth of an oil well; a pipe post of the sucker rod and a perforating cutter are brought out, connected with the high-pressure ejection system and taken into the well; and the high-pressure hose takes the high-pressure nozzle into the hole through the rail groove for high-pressure ejection. The well drilling system solves the problem that old wells increase oil draining area, and can be widely applied to oil well drilling and completion operations.

The invention belongs to the technical field of precision machining and measurement, and discloses a complex curved surface part point cloud reduction method capable of effectively keeping boundary and local features. The method comprises the following steps: generating a scanned point cloud of a complex curved surface part; obtaining a plurality of neighborhood points for each point in the point cloud and calculating each normal line vector; finding out m points within the shortest radius range with each point being as the centre of sphere, and then, calculating the average value of included angles between the normal line vectors of the points in the point cloud and the normal line vectors of the m points; setting a threshold value based on the average value of included angles, and then, carrying out feature coarse classification; carrying out secondary subdivision to finish selection of a first reduction subset, and then, calculating directional Hausdorff distance to finish selection of a second reduction subset; and finally, merging the two reduction subsets to obtain a reduced scanned point cloud. Compared with the prior art, the method can achieve higher precision and efficiency, and can effectively keep the boundary and local features of the point cloud model.

The present invention relates to well drilling and completing technology and implement, and is one set of horizontal well drilling and completing technique and implement. The implement consists of drift diameter gauge, wrought milling cutter, positioning drilling bit, positioning angle building guide apparatus, drilling rod and other parts; and features the connection of the positioning drilling bit and the flexible drilling rod via toothed claw, flexible rod set inside the guiding and following sieve tube and the positioning angle building guide apparatus set in the front of the flexible rod. After finishing angle building and drilling, the flexible drilling rod is withdrawn to finish the horizontal well drilling and completion. With short well drilling period, low cost and high efficiency, the present invention may be used widely in oil production as well as coal and water supply industry.

Fiber optic sensors commonly require a 180 degree turnaround to form a continuous optical circuit. Methods and apparatus for providing 180 degree turnarounds in a fiber optic system that include a shorter radius turnaround then provided by micro-bending the optic fiber are desired. An embodiment of a turnaround apparatus includes a first optic fiber pigtail, a second optic fiber pigtail, and an optical waveguide forming a U-shaped path having an input end optically connected to a first end of the first pigtail and an output end optically connected to a first end of the second pigtail.

Tile nippers are provided with hardened teeth formed with a short radius curvature extending from substantially flat interior shoulders configured to be substantially parallel when used for gripping and breaking tile. A compound leverage assembly connects the jaws of the tile nippers to the handles of the tile nippers. A retractable cutter or scoring wheel may be provided in a free end of a handle. A nail puller notch may be provided on a jaw of the tile nippers to allow the tile nippers to be used for gripping and pulling nails without damaging the tips of the teeth.

The invention relates to a method for well drilling and cementing of a radial horizontal well with ultra-short radius and equipment thereof. A method of well drilling before well cementing is adopted and the method comprises the steps of: well drilling: universal joints are used to connect a plurality of flexible drill stems, a first-section flexible drill stem and an angle gain drilling head, an angle gain device is installed in a vertical well hole, and the upper surface of the device is a steering curved face inclined downwards; the flexible drill stems are made inclination on the steering curved face of the angle gain device, and the device is taken out of the well after well drilling; well cementing: a plurality of sections of flexible sleeves connected by hinged extension pipes are placed into the well hole for well cementing. Meanwhile, the minimum outside diameter of the angle gain drilling head is not less than that of the flexible drill stem, and the outside diameter of the flexible drill stem is not less than that of the flexible sleeve. The invention has the advantages that: the damage to sleeves is reduced; flexible sleeves are put in position for well cementing after well drilling, and therefore the strength of flexible sleeves is approximate to that of common sleeves; well drilling can not be affected even if small eccentricity occurs in the process of well drilling, and flexible drill stems can arch in reverse direction to avoid barriers when rubbing against well walls.

The invention relates to an ultra-short-radius radial lateral drilling method for a horizontal well. Problems that in the existing horizontal well ultra-short-radius radial lateral drilling method, boreholes are irregular, a horizontal distance is short, cost is high, and safety is poor are solved. The ultra-short-radius radial lateral drilling method for horizontal wells is characterized by comprising the following steps of (1) borehole preparation, (2) whipstock tripping-in, (3) window opening, (4) deflecting flexible drill pipe tripping-in for deflecting, (5) open hole logging, (6) horizontal drilling, and (7) well completion. After a horizontal well is drilled by the method, a radius is small, a borehole is regular, a horizontal distance is long, drilling time is short, construction cost is low, and safety is high.

Method is provided for drilling of formations containing carbonate minerals with flexible tubing capable of being turned in a very short radius. The very flexible tubing may be placed inside a work string in a well with coiled tubing and a micro-jet bit on the tubing be diverted to a selected direction and depth. Acidic drilling fluid pumped through the micro-jet bit allows high rates of drilling with hydrochloric acid. A slip joint between coiled tubing and the flexible tubing may be used to allow jet drilling without movement of the coiled tubing and use of a jet bit with forward-facing jets. Mixing of acid and base solutions downhole may be used to provide hotter acid solutions for drilling.

The invention provides a method for drilling a horizontal well with super-short radius, and the method is implemented by taking supercritical CO2 fluid as drilling fluid, and combining the supercritical CO2 fluid with a continuous oil pipe to carry out well drilling. In the invention, the supercritical CO2 fluid is introduced for assisting the continuous oil pipe in performing an action of drilling the horizontal well with super-short radius, so that the respective advantages of the supercritical CO2 fluid and the continuous oil pipe can be fully played.

The invention discloses a device for drilling minimal borehole on one coiled tubing side with ultra-short radius, which comprises a guider, a flexible transmission shaft, a driving motor and a bit. The flexible transmission shaft is arranged inside the guider, the bit is arranged at the output end of the flexible transmission shaft, and the driving motor is arranged at the input end of the flexible transmission shaft. The flexible transmission shaft includes more than three transmission sections which are connected with each other through ball heads, and the transmission sections are in surface contact with the ball heads. The invention increases the axial area of the flexible transmission shaft by using the ball heads to connect the transmission sections of the flexible transmission shaft and designing the surface contact between the transmission sections and the ball heads, thus prolonging the service time of the flexible transmission shaft and improving the device stability.

The invention relates to secondary productivity development of old wells and shut-down wells in oil fields and provides a window opening and sidetrack drilling short-radius horizontal well and reverse circulation well cementing and water plugging method. The method mainly includes the following six steps that: 1) a window opening point is selected; 2) a well trajectory is designed; 3) a whipstock is positioned and set; 4) casing window cutting operation is performed; 5) well trajectory control is performed; and 6) well completion operation is performed. The method of the invention can be applied to the secondary development of a part of low-yield wells and scrapped shut-down wells, can effectively obtain stored oil and residual oil in dead corners in uncontrolled areas of old wells, and can restore and improve single well production and ultimate recovery efficiency.