Abstract: Provided are a molded product for well drilling comprising a reactive metal and a degradable resin composition that promotes a degradation reaction of the reactive metal, preferably a degradable resin composition comprising a degradable resin that generates acid upon degradation or a degradable resin composition containing a degradable resin and an inorganic material or an organic material that promotes degradation of the reactive metal; a molded product for well drilling which is a downhole tool or a downhole tool member; and a method for well drilling that uses said molded product for well drilling.

Abstract: A sheet processing device performs saddle stitching binding a bundle of stacked paper sheets, and includes a stacker section temporarily stacking conveyed paper sheets substantially vertically; a stopper regulating the paper sheets stacked in the stacker section; a first binding section provided in the stacker and saddle-stitching, with a metallic staple, a paper sheet bundle regulated by the stopper at a binding position around a center of the paper sheet bundle in a sheet conveying direction; a second binding section saddle-stitching, without using the metallic staple, the paper sheet bundle being regulated by the stopper at the binding position around the center of the paper sheet bundle in the sheet conveying direction; and a folding section folding in half the paper sheet bundle regulated by the stopper at a folding position at which the paper sheet bundle is bound by the first binding section or second binding section.

Abstract: In light of increasingly severe and diverse excavation conditions for hydrocarbon resource recovery, such as the drilling of very deep wells, provided is a highly impact-resistant polyglycolic acid resin composition that is resistant to damage even from contact or collision with various members during molding, transport, and well drilling; has excellent mechanical properties and heat resistance; can easily be removed as necessary after the completion of well treatment; and contributes to reducing the cost and shortening the process of well drilling. Also, provided is a molded product for well drilling, such as a downhole tool member.

Abstract: Described are a molded product having an effective thickness of 1 mm or more, the molded product being formed from an aliphatic polyester resin composition containing from 1 to 30 parts by mass of a carboxylic acid anhydride and preferably further containing from 1 to 50 parts by mass of at least one type of a short fiber reinforcing material, a thermoplastic elastomer, or an acrylic rubber core-shell polymer per 100 parts by mass of an aliphatic polyester resin containing not less than 50 mass % of a polyglycolic acid resin, the effective thickness being 1 mm or more; a downhole tool for hydrocarbon resource recovery formed from the molded product having an effective thickness of 1 mm or more; an aliphatic polyester resin composition for the downhole tool member for hydrocarbon resource recovery; and a well drilling method.

Abstract: A well treatment method characterized by disintegrating an elastic material by contacting a seal member for downhole tools comprising the elastic material with a well treatment fluid (acids such as hydrochloric acid, formic acid, acetic acid, and hydrofluoric acid, alkalis, hot water, steam, organic solvents, and the like).

Abstract: In light of increasingly severe and diverse excavation conditions for hydrocarbon resource recovery, such as the drilling of very deep wells, provided is a highly impact-resistant polyglycolic acid resin composition that is resistant to damage even from contact or collision with various members during molding, transport, and well drilling; has excellent mechanical properties and heat resistance; can easily be removed as necessary after the completion of well treatment; and contributes to reducing the cost and shortening the process of well drilling. Also, provided is a molded product for well drilling, such as a downhole tool member.

Abstract: Provided are a molded product having an effective thickness of 1 mm or more, the molded product being formed from an aliphatic polyester resin composition containing from 1 to 30 parts by mass of a carboxylic acid anhydride and preferably further containing from 1 to 50 parts by mass of at least one type of a short fiber reinforcing material, a thermoplastic elastomer, or an acrylic rubber core-shell polymer per 100 parts by mass of an aliphatic polyester resin containing not less than 50 mass % of a polyglycolic acid resin, the effective thickness being 1 mm or more; a downhole tool for hydrocarbon resource recovery formed from the molded product having an effective thickness of 1 mm or more; an aliphatic polyester resin composition for the downhole tool member for hydrocarbon resource recovery; and a well drilling method.

Abstract: A polyester resin composition comprising: 100 parts by mass of a polyester resin having at least 50% by mass of a glycolic acid resin; and from 0.5 to 50 parts by mass of a carboxylic acid anhydride.

Abstract: A sheet post-processing device includes a conveying section that conveys a paper sheet; a punch section that punches punch holes in the paper sheet conveyed by the conveying section; a stacker section that stores the paper sheet in which the punch holes are punched by the punch section; a binding section that binds a paper sheet bundle stored in the stacker section with a binding member; and a controller that controls the above sections. The controller selectively performs a ring binding mode and a direct binding mode. The ring binding mode is a mode in which punch holes are punched in the paper sheet by the punch section and then the binding member is made to penetrate the punch holes for binding. The direct binding mode is a mode in which the binding member is directly driven into the paper sheet bundle without punching the punch holes in the sheet.

Abstract: A degradable rubber member for a downhole tool formed from a rubber material containing from 0.1 to 20 parts by mass of a degradation accelerator relative to 100 parts by mass of a degradable rubber (optionally containing other rubber materials and/or reinforcing materials), of which, preferably, the decrease rate of the mass or the 50% strain compressive stress after immersion for 24 hours in 150° C. water is not less than 5%, and/or the mass loss rate after immersion for 72 hours in 150° C. water is from 5 to 100%, and further, as desired, the tensile fracture strain at 66° C. is not less than 50%, the 70% strain compressive stress is not less than 10 MPa, and the compressive fracture strain is not less than 50%; a degradable seal member or a protecting member for downhole tools comprising such a rubber member; and a downhole tool such as a plug for well drilling, and a method for well drilling.

Abstract: A well treatment method characterized by disintegrating an elastic material by contacting a seal member for downhole tools comprising the elastic material with a well treatment fluid (acids such as hydrochloric acid, formic acid, acetic acid, and hydrofluoric acid, alkalis, hot water, steam, organic solvents, and the like).

Abstract: A sheet post-processing device includes a conveying section that conveys the paper sheet, a punch section that punches punch holes in the paper sheet conveyed by the conveying section, a stacker section that stores the paper sheet in which the punch holes are punched by the punch section, a stopper section that regulates a conveying direction leading end of the paper sheet stored in the stacker section; a binding section that binds the paper sheet bundle whose leading end is regulated by the stacker section, and a folding section that folds the paper sheet bundle bound by the binding section at a predetermined folding position. The punch section punches the punch holes at the front and rear of the folding position in the sheet conveying direction, and the binding section binds the paper sheet bundle with a paper-made staple by making the paper-made staple penetrate the punch holes.

Abstract: In an electric vehicle, high-power unit (20) disposed in motor room (2) to supply drive current to motor drive unit (10), and battery pack (30) disposed below vehicle body floor (3) are connected to each other through charging/discharging harness (51). High-power unit 20 includes unit back surface (high-power module back surface) (24) that faces dash panel (4), and harness connection concave portion (25) recessed from unit back surface (24) toward an inside of high-power unit (20), wherein charging/discharging harness connection terminal (26) to which one end (51a) of charging/discharging harness (51) is connected is disposed inside of harness connection concave portion (25).

Abstract: A paper-made staple binds a sheet bundle subjected to folding processing by a folding blade and a folding roller. The paper-made staple includes a pair of leg portions inserted into the sheet bundle and then bent inward; and a connection portion that connects the leg portions in a staple longitudinal direction. The connection portion has, at an edge portion thereof, a cut in a direction crossing the longitudinal direction so as to correspond to a predetermined folding position of the sheet bundle for the purpose of facilitating the folding of the connection portion, and the cut is formed inward from the edge portion so as to have a substantially triangular shape and is provided on both edge portions of the connection portion of the paper-made staple.

Abstract: A temporary plugging agent for well drilling having a plugging function for a period of not greater than 40 days in a high-temperature environment having a temperature range between 93 and 204° C., and preferably, the above temporary plugging agent for well drilling (optionally formed from two or more types of plugging agents for well drilling) wherein a contained synthetic resin has a ratio of mass loss rate in 80° C. deionized water relative to the mass loss rate of polyglycolic acid of not less than 0.001 and less than 1, and/or has a compressive strength after a period of not greater than 40 days has elapsed at a temperature range between 93° C. and 204° C. of not less than 20% lower than the compressive strength before the period began; a well-treatment fluid comprising the temporary plugging agent for well drilling; and a method for well drilling in which a temporary plugging treatment is performed using the temporary plugging agent for well drilling.

Abstract: Provided is a degradable seal member for downhole tools, the member being formed from a degradable polymer material that is preferred to be a thermoplastic polymer material or a polymer material including an ester bond, an amide bond, or a urethane bond, and that is further preferred to be a polymer material that contains an aliphatic polyester. It is preferred that the degradable seal member exhibits a bending elastic modulus of 0.01 to 8 GPa at 23° C., further preferred that a stable state is maintained in a dry environment and that degradation in a fluid of a temperature not less than 66° C. is possible, and also preferred that a molded article has an annular shape. Also provided are a downhole tool such as a plug for well drilling and completion, and a method of well drilling and completion.

Abstract: A sheet post-processing device includes a stacker section that temporarily stores paper sheets as a paper sheet bundle, a stopper that regulates a carrying-in direction leading end of the paper sheet carried into the stacker section, a binding section that binds the paper sheet bundle regulated in position by the stopper, and folding rollers and a folding blade that perform folding processing for the sheet bundle bound by the binding section at a predetermined folding position of the paper sheet bundle. The binding section binds the paper sheet bundle with a paper-made staple. The stopper sets a position of the paper sheet bundle such that a binding position of the paper-made staple straddles the predetermined folding position. With this configuration, there can be provided a sheet-post processing device capable of folding the staple together with the paper sheet bundle.

Abstract: A sheet processing device performs saddle stitching binding a bundle of stacked paper sheets, and includes a stacker section temporarily stacking conveyed paper sheets substantially vertically; a stopper regulating the paper sheets stacked in the stacker section; a first binding section provided in the stacker and saddle-stitching, with a metallic staple, a paper sheet bundle regulated by the stopper at a binding position around a center of the paper sheet bundle in a sheet conveying direction; a second binding section saddle-stitching, without using the metallic staple, the paper sheet bundle being regulated by the stopper at the binding position around the center of the paper sheet bundle in the sheet conveying direction; and a folding section folding in half the paper sheet bundle regulated by the stopper at a folding position at which the paper sheet bundle is bound by the first binding section or second binding section.

Abstract: A sheet processing device performs saddle stitching binding a bundle of stacked paper sheets, and includes a stacker section temporarily stacking conveyed paper sheets substantially vertically; a stopper regulating the paper sheets stacked in the stacker section; a first binding section provided in the stacker and saddle-stitching a paper sheet bundle regulated by the stopper at a binding position around a center of the paper sheet bundle in a sheet conveying direction; a folding section folding in half the paper sheet bundle regulated by the stopper; and a conveying section conveying the paper sheet bundle that has been folded in half by the folding section with a back side of the folded paper sheet bundle as a leading end in the conveying direction. The conveying section includes a second binding section binding the folded paper sheet bundle at the back side thereof.

Abstract: This sheet punching device includes a placement table 53 on which the sheet is placed, a hollow punching member 60 that punches the sheet placed on the placement table 53, a punching moving member 66 that moves the punching member between a punching position where the sheet is punched and a retreat position retreated from the punching position, a punching drive section 70 that drives the punching moving member 66, a waste pushing member 80 that is disposed in the hollow portion of the punching member 60 and pushes punching waste remaining in the hollow portion, a pushing moving member 85 that moves the waste pushing member 80 between a pushing position protruding from the hollow portion of the punching member and a housing position in the hollow portion, and a pushing drive section 70 that drives the pushing moving member 85.