公开(公告)号：US20240052720A1

公开(公告)日：2024-02-15

申请号：US18547246

申请日：2022-02-24

Applicant: Kureha Corporation

Inventor： Shinnosuke YOSHIDA ,  Shinya TAKAHASHI

IPC: E21B33/128

CPC classification number: E21B33/1285

Abstract: A downhole tool securing device and a frac plug which are excellent in setting properties and water pressure resistance and have excellent fracturing properties. A downhole tool securing device (slips) of a frac plug according to one embodiment of the present invention includes a button containing a powder metallurgy material and having a compressive elastic modulus of at least 13.5 GPa and a toughness of 0.23 GJ/m3 or greater and 1.0 GJ/m3 or less.

公开(公告)号：US20230193109A1

公开(公告)日：2023-06-22

申请号：US17997784

申请日：2021-05-07

Applicant: Kureha Corporation

Inventor： Shinnosuke YOSHIDA ,  Shinya TAKAHASHI

IPC: C09K8/46 ,  B21C23/14 ,  E21B33/12 ,  C09K8/42

CPC classification number: C09K8/46 ,  B21C23/14 ,  E21B33/1208 ,  C09K8/426

Abstract: Provided is a frac plug or the like capable of being inserted into a borehole to seal the borehole with high strength, and then quickly disassembled and removed, thereby efficiently producing petroleum. A frac plug according to the present embodiment has a member made of a magnesium (Mg) alloy. The member has a multi-phase structure including a first phase, which is a matrix phase, and a second phase present in the first phase. In the multi-phase structure, the second phase is distributed in a substantially striped pattern in the first phase in a first cross section perpendicular to a second direction of the frac plug, and distributed in a substantially mesh-like pattern in the first phase in a second cross section perpendicular to a first direction of the frac plug.

公开(公告)号：US20210062609A1

公开(公告)日：2021-03-04

申请号：US16960240

申请日：2018-12-26

Applicant: Kureha Corporation

Inventor： Shinya TAKAHASHI ,  Aki SHITSUKAWA

IPC: E21B33/129

Abstract: A downhole plug for well completion is provided, which rapidly degrades after hydraulic fracturing, so that the flow path is recovered in a short time. A downhole plug (10) is provided, which includes: a mandrel (1) made of a degradable material; and a plurality of peripheral members (2, 3, 4, 5, 6a, 6b, 8a, 8b) made of a degradable material and disposed on an outer peripheral surface of the mandrel (1), where at least one of the plurality of peripheral members (6a, 6b) includes: a hollow portion (64) through which a fluid flowing along an axial direction of the mandrel (1) can pass; or a groove in at least a portion of, a surface serving as an outer surface of the downhole plug (10), or a surface in contact with the mandrel (1).

公开(公告)号：US20180187060A1

公开(公告)日：2018-07-05

申请号：US15513529

申请日：2015-09-15

Applicant: Kureha Corporation

Inventor： Masayuki OKURA ,  Takeo TAKAHASHI ,  Shinya TAKAHASHI ,  Takuma KOBAYASHI

IPC: C09K8/035 ,  C09K8/03 ,  C09K8/80 ,  C09K8/42 ,  C08G63/08 ,  C08K3/08

CPC classification number: C09K8/035 ,  C08G63/08 ,  C08G2230/00 ,  C08K3/01 ,  C08K3/013 ,  C08K3/08 ,  C08K3/10 ,  C08K5/0033 ,  C08K2003/0812 ,  C08K2201/018 ,  C09K8/032 ,  C09K8/426 ,  C09K8/50 ,  C09K8/68 ,  C09K8/72 ,  C09K8/80 ,  C09K8/88 ,  E21B33/128 ,  E21B33/1293 ,  E21B43/267 ,  C08L67/04 ,  C08L67/02

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.

公开(公告)号：US20170284167A1

公开(公告)日：2017-10-05

申请号：US15512846

申请日：2015-09-15

Applicant: Kureha Corporation

Inventor： Takeo TAKAHASHI ,  Masayuki OKURA ,  Shinya TAKAHASHI

IPC: E21B33/12 ,  E21B43/26 ,  B32B27/40 ,  B32B27/36 ,  B32B27/20 ,  C09K8/72 ,  C08K3/08

CPC classification number: E21B33/1208 ,  B32B27/20 ,  B32B27/36 ,  B32B27/40 ,  C08K3/08 ,  C08K2003/0812 ,  C08K2003/0818 ,  C08L101/00 ,  C09K8/725 ,  E21B33/10 ,  E21B43/00 ,  E21B43/26

Abstract: A downhole tool, provided with: a downhole-tool member containing a reactive metal; a downhole-tool member containing a degradable resin composition that promotes degradation of the reactive metal, preferably a degradable resin composition containing a degradable resin that generates an acid by degradation or a degradable resin composition containing a degradable resin and an inorganic substance or organic substance that promotes degradation of the reactive metal; and, as desired, a degradable rubber member. Moreover, a well-drilling method using this downhole tool.

公开(公告)号：US20250003310A1

公开(公告)日：2025-01-02

申请号：US18763176

申请日：2024-07-03

Applicant: Kureha Corporation

Inventor： Shinnosuke YOSHIDA ,  Shinya TAKAHASHI

IPC: E21B33/129 ,  B21C23/14 ,  C09K8/42 ,  C09K8/46 ,  C22C23/00 ,  C22C23/04 ,  C22C23/06 ,  E21B33/12

Abstract: Provided is a frac plug or the like capable of being inserted into a borehole to seal the borehole with high strength, and then quickly disassembled and removed, thereby efficiently producing petroleum. A frac plug according to the present embodiment has a member made of a magnesium (Mg) alloy. The member has a multi-phase structure including a first phase, which is a matrix phase, and a second phase present in the first phase. In the multi-phase structure, the second phase is distributed in a substantially striped pattern in the first phase in a first cross section perpendicular to a second direction of the frac plug, and distributed in a substantially mesh-like pattern in the first phase in a second cross section perpendicular to a first direction of the frac plug.

公开(公告)号：US20230212926A1

公开(公告)日：2023-07-06

申请号：US18006986

申请日：2021-07-09

Applicant: Kureha Corporation

Inventor： Shinya TAKAHASHI

IPC: E21B34/14 ,  E21B43/26 ,  E21B43/14

CPC classification number: E21B34/142 ,  E21B43/26 ,  E21B43/14

Abstract: In a dart for a downhole device according to the present invention, a ball is formed of a first degradable material having a first degradation rate, a mandrel is formed of a second degradable material having a second degradation rate lower than the first degradation rate, and a sleeve is formed of the second degradable material or a third degradable material having a third degradation rate lower than the second degradation rate.