46results about How to "Improve drillability" patented technology

The present invention provides a resin composition which can simply provide, with good reproducibility, a laminate, a printed wiring board, and the like that not only have excellent heat dissipation properties but have good moldability, good mechanical drillability and excellent appearance, and a prepreg, a metal foil-clad laminate, and the like using the same. A resin composition having a cyanate ester compound (A), an epoxy resin (B), a first inorganic filler (C), a second inorganic filler (D), and a molybdenum compound (E), wherein an average particle diameter ratio of the first inorganic filler (C) to the second inorganic filler (D) is in a range of 1:0.02 to 1:0.2.

The invention discloses a crown and a steel junction surface of a hierarchical internal cone shaped vortex-type centering pilot diamond impregnated wire line coring geological bit with symmetrical pigeon-toed toes in and a manufacturing method of the bit. The bit comprises a working layer of the diamond bits, a bit steel body, middle isolation scraps and connecting layer materials. The bit has the following beneficial effects: assembly and configuration of the whole set of bit tools of the bit designed in the invention take pairing of each pair of bit tools as the pigeon-toe forming mode; the pairing formula of the bit tools is characterized by female / male layering, symmetry and balance; the bit tools are positioned, arranged and seated to form the internal cone shape; the situation of layered distribution and preset synchronous diminishing of the bit tools forms the preset function of using gentle methods and force; the crown is shaped like vortex-type cone-preserving pigeon-toe (the preset pigeon-toe is transient equilibrium buffer and synchronous compensation in place of dynamic landing of the bit); the vortex-type pilot centering force is continuously obtained and the continuous vortex-type pilot centering force is the concept of the pigeon-toed toes in; the toes in are effective restraints for controlling advance; the toes in need to control the vertical effective latitude of the bore diameter when being applied in the drilling bit; and the mode of cushioning the toes in with pigeon-toes to control centering pilot is taken as the first key point.

The invention discloses a drillable ball injection sliding sleeve for oil-gas well staged fracturing, which comprises an upper main body, a middle main body, a lower main body, a movable sleeve arranged on the inner side of the middle main body, wherein the movable sleeve is connected with the middle main body through a shear pin; a locating clamp spring is mounted in a cavity between the movable sleeve and the middle main body; a guide groove is arranged on the outer side of the movable sleeve; a guide pin is arranged on the middle main body and extends out of the bottom of the guide groove into the guide groove; a drillable ball seat is mounted on a boss formed at the bottom part of the movable sleeve; a low density ball is arranged in the drillable ball seat in a setting manner; guide pipes extending downwards are arranged at the lower ends of the upper main body and the movable sleeve respectively; circulation openings are formed at the upper part of the middle main body; and a plurality of communication openings are formed at corresponding positions on an extension pipe of the upper main body; and the distance between the upper end of the movable sleeve and the lower part of the communication openings is equivalent to that between the lower end of the movable sleeve and the upper end of the lower main body. Through the sliding sleeve, the selective fracturing reformation and commingled production can be realized without moving pipe columns, meanwhile fracturing at each layer is performed in sequence, the operation risk is low, and the fracturing construction time is greatly reduced.

The invention discloses a novel fixed point area control grouting device which comprises an auxiliary pipe, a grouting pipe and an injection hole formed in the grouting pipe. The injection hole is circular or oval or square or rectangular. One end of the grouting pipe is conic. The grouting pipe is directly inserted into the auxiliary pipe and located in the auxiliary pipe expect for the conic end. The gradient between the end of the auxiliary pipe and the horizontal plane is 15 degrees to 30 degrees. The novel fixed point area control grouting device has the advantages that a key point weak area can be directly reinforced, the re-drilling amount is reduced, the frequency of occurrence of drill holding accidents is greatly reduced, a construction period is shortened, the grouting cost is saved, and the grouting effect is improved; the novel fixed point area control grouting device is simple in structure and suitable for being manufactured in a site, the grouting pipe can be recycled, a plastic pipe is low in price, and the cost of the novel fixed point area control grouting pipe is remarkably reduced; the auxiliary pipe remaining in a drill hole is good in drillability, the drill hole can be reused, and following drill hole construction is not influenced.