Information transmission apparatus for logging while drilling

Patent metadata

Field	Value
Publication number	US-9816327-B2
Application number	US-201314415944-A
Country	US
Kind code	B2
Filing date	Jun 18, 2013
Priority date	Jul 20, 2012
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

An information transmission apparatus for logging while drilling comprises a hollow drilling rod and at least one cable. The drilling rod comprises at least one first drilling rod member and at least one second drilling rod member spliced to each other alternately. The first drilling rod member comprises a through hole, and the second drilling rod member comprises a stepped hole. The cable comprises a fixed end, a connected end, and a folded portion connect the fixed end to the connected end. Each of the cables is fixed in the stepped hole through a fixed end or is connected to a connected end of an adjacent cable. The connected end may be stretched along the stepped hole, and stretched through the through hole to be electrically connected to a logging instrument or a fixed end of the adjacent cable. The apparatus provides protection for a cable through a hollow drilling rod, thereby improving the transmission reliability.

First claim

The invention claimed is:

1. An information transmission apparatus for logging while drilling, comprising a hollow drilling rod electrically connected to a piece of ground equipment and at least one cable, wherein the drilling rod comprises at least one first drilling rod member and at least one second drilling rod member connected to each other alternately; the first drilling rod member comprises a through hole, and the second drilling rod member comprises a stepped hole; each of the cables comprises a fixed end, a connected end, and a folding portion connecting the fixed end to the connected end; each of the cables is fixed in the stepped hole through the fixed end or is connected to a connected end of an adjacent cable; the connected end is stretchable along the stepped hole, and stretched through the through hole to be electrically connected to a logging instrument or a fixed end of the adjacent cable,
wherein the stepped hole comprises a first segment hole in communication with a first end of the second drilling rod member, a receiving portion obliquely connected to the first segment hole, a transition portion connected to the receiving portion, and a second segment hole connected to and in communication with the second end of the second drilling rod member; a diameter of the transition portion is smaller than that of the receiving portion and the second segment hole; a first stepped surface is formed between the transition portion and the receiving portion, and a second stepped surface is formed between the transition portion and the second segment hole; a passage in communication with the first and second stepped surfaces is provided between the first and second stepped surfaces; the folding portion abuts against one of the first and second stepped surfaces; and the connected end extends to the second segment hole after passing through the passage.

2. The information transmission apparatus for logging while drilling according to claim 1 , wherein the folding portion is helical and is formed by winding the corresponding cable.

3. The information transmission apparatus for logging while drilling according to claim 1 , wherein the first segment hole has a flared cross-section, and the fixed end is fixed to an inner wall of the first segment hole.

4. The information transmission apparatus for logging while drilling according to claim 3 , wherein each of the first drilling rod members is extended to be provided with a tenon which is fixed in the first segment hole.

5. The information transmission apparatus for logging while drilling according to claim 3 , wherein the folding portion is accommodated in the receiving portion, and the connected end is electrically connected to the logging instrument or the fixed end of the adjacent cable after extending and passing through the second segment hole.

6. The information transmission apparatus for logging while drilling according to claim 5 , wherein the second end of each of the second drilling rods members extends to form a connected portion, each of the first drilling rod members is provided with a connected port, and the connected portion is fixed in the connected port.

7. The information transmission apparatus for logging while drilling according to claim 6 , wherein the connected portion is provided with external threads and the connected port is provided with internal threads, and the connected portion is in a threaded connection with the connected port.

8. The information transmission apparatus for logging while drilling according to claim 6 , wherein an outer wall surface of the connected portion and an inner wall surface of the connected port are both oblique surfaces.

9. The information transmission apparatus for logging while drilling according to claim 1 , wherein the fixed end and the connected end of each of the cables are both provided with an abutting device, and the cables are abutted with or separated from each other through the abutting device.

Assignees

• China Nat Petroleum Corp
• Cnpc Drilling Res Inst
• Beijing Petroleum Machinery Factory

Inventors

• Liu Guanghua
• Zou Lianyang
• Liu Xinli
• Huang Yanfu
• Tao Shikai
• Yang Wenjing
• Yan Guoxing
• Shi Hongjiang
• Li Tiejun
• Wang Chen
• Shi Qian
• Sun Chengqin
• Zhang Chunhua
• Zhou Zhiyong
• Pan Xingming
• Wu Qingkui
• Li Zhangjian

Classifications

• F16L11/127

  electrically conducting · CPC title

• E21B17/028 Primary

  Electrical or electro-magnetic connections · CPC title

• E21B47/12

  Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling · CPC title

• E21B47/122

  Fixed Constructions · mapped topic

• E21B17/003

  with electrically conducting or insulating means (E21B17/028 and E21B17/023 take precedence) · CPC title