Cable pay-off device and pay-off method for downhole instrument

A technology of downhole instruments and pay-off devices, applied in cable laying equipment, etc., can solve problems such as loss of drilling equipment and inability to continue drilling in formations, and achieve the effects of reducing drilling costs, increasing drilling depth, and ensuring power supply

CN105449592BInactive Publication Date: 2017-07-04BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-07-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a cable pay-off device for a downhole instrument and a pay-off method. The cable pay-off device for the downhole instrument comprises a cable storage cavity, wherein the cable storage cavity is formed in the downhole instrument and comprises a rotating shaft assembly, a clutch and a collector ring assembly; the rotating shaft assembly is arranged in the cable storage cavity and is used for coiling a cable; the clutch is connected with the rotating shaft assembly and is used for controlling the rotating direction of the rotating shaft assembly; the collector ring assembly comprises a rotor and a stator, which are matched with each other; the rotor is connected with the cable coiled on the rotating shaft assembly; and the stator is connected with a wire inlet end of the downhole instrument. Therefore, the cable pay-off device has the advantages that (1) power supply and information transmission of a downhole drilling tool can be effectively ensured by synchronous pay-off of the cable while drilling; (3) enough cable can be stored, so that the drilling depth of a downhole drilling device can be effectively improved and the drilling cost is reduced; and (3) the drilling depth of the downhole tool can be effectively measured by an advanced cable pay-off method.
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Description

technical field

[0001] The invention relates to a cable pay-off device and a pay-off method, belonging to the field of drilling equipment, in particular to a cable pay-off device and a pay-off method for downhole instruments. Background technique

[0002] In the field of petroleum exploration and development, conventional exploration drilling needs to use land drilling rigs or offshore drilling platforms to drive downhole drill bits through mud or air drills circulating in the drill pipe to achieve the purpose of breaking rocks. This exploration method has high drilling costs and high exploration risks. In order to fundamentally reduce exploration costs and exploration risks, Norway, the United States, China, etc. are developing a new type of unconventional drilling equipment, that is, an automatic downhole drilling device without a drilling rig, which can significantly reduce exploration drilling costs and exploration risks.

[0003] The rig-less downhole automatic drillin...

Examples

Embodiment

[0031] like figure 1 As shown, a cable pay-off device for downhole instruments. The device is a part of the downhole drilling device without a drilling rig, and can be connected with the downhole drilling device through a flange or a threaded interface. from figure 1 It can be seen that the cable pay-off device mainly includes: a main shaft 1 , a casing 2 , a slip ring assembly 14 , a clutch 12 , and a rotating shaft assembly 3 . in:

[0032] The main shaft 1 is a hollow structure with a mud or debris channel in the middle, and the main shaft 1 is mainly used to carry the main body of the cable pay-off device.

[0033] The outer shell 2 is set outside the main shaft 1, and is used to bear the underground formation pressure and prevent external cuttings or mud from entering the inner cavity of the device of the present invention. The shell 2 is assembled with the hollow main shaft 1 through the upper end cover 7 and the upper flange 6, the lower end cover 5 and the lower fl...