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Intelligent control casing valve applied to unbalanced drilling/completion

An underbalanced drilling and intelligent control technology, applied in wellbore/well valve devices, wellbore/well components, earthwork drilling, etc., can solve problems such as speeding up power consumption, improve efficiency and safety, and promote popularization Application, the effect of prolonging the service life

Active Publication Date: 2015-08-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the casing valve is installed with the casing, even if the casing valve plate does not need to be closed, it will be closed as long as the drill string passes, thus speeding up the consumption of power

Method used

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  • Intelligent control casing valve applied to unbalanced drilling/completion
  • Intelligent control casing valve applied to unbalanced drilling/completion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] like figure 1 , 2 As shown: the intelligent control casing valve is connected by threads to become a part of the casing string 3, which includes a body 11, a valve plate 16, a battery pack 7, an RFID system, a hydraulic pump 9 controlled by the RFID system, and a hydraulic pump controlled by the hydraulic pump. 9 the inner cylinder liner 12 that controls its up and down movement; wherein, the RFID system includes a tag 17 and a reader 6, the tag 17 is embedded inside the smart sub 5, and its surface is covered with a wear-resistant layer 18, and the smart sub is connected to the drill string 4 Above; the reader 6 is installed on the upper part of the body 11, and the hydraulic pump 9 is connected to the reader 6 through the signal line 8; the lower part of the body 11 forms a cavity 2, and the two hydraulic lines 10 of the hydraulic pump 9 are respectively connected to the cavity 2 The upper and lower ends of the upper and lower ends; the inner cylinder liner 12 and th...

Embodiment 2

[0020] The difference from the structure of the intelligent control casing valve in Embodiment 1 is that the drill string 4 is not connected to the intelligent nipple 5, and the label exists in the form of a signal ball 19. The core of the signal ball 19 is a label 17, and the outside is formed of resin For the protective layer, the resin is preferably phenolic resin.

[0021] When in use, because the drill string 4 is not installed with the smart nipple 5 before going down the well, but during the rock breaking process, the formation pressure suddenly increases, and the casing valve valve plate 16 needs to be closed when the drill string 4 is pulled out. The lowermost end of the drill string 4 is tripped to the position between the valve plate 16 and the signal reader 6, and then the signal ball 19 is dropped from the wellhead 1. When the signal ball 19 falls to the vicinity of the reader 6 along the inner hole of the drill string 4, The reader 6 detects the label 17 to contr...

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Abstract

The invention provides an intelligent control casing valve applied to unbalanced drilling / completion. The intelligent control casing valve comprises a body, a valve plate, a battery pack, an RFID (radio frequency identification) system, a hydraulic pump and an inner cylinder sleeve, wherein the hydraulic pump is controlled by the RFID system, and the inner cylinder sleeve is controlled by the hydraulic pump; the RFID system comprises a tag and a reader; the tag is embedded into a drill stem or is a signal ball, and the reader is arranged at the upper part of the body; a containing cavity is formed in the lower part of the body; hydraulic lines of the hydraulic pump are respectively connected with two ends of the containing cavity; the inner cylinder sleeve and the containing cavity form a sealing cavity; the side wall of the sealing cavity is provided with a boss; the boss is inserted into the containing cavity; the lower end of the inner cylinder sleeve is contacted with the valve plate; the valve plate is fixedly arranged on the body through a hinge pin and a torsional spring sheathing the hinge pin; when the inner cylinder sleeve is downward, the valve plate can be opened; the battery pack is arranged on the body, and is respectively connected with the hydraulic pump and the reader. The intelligent control casing valve is simple to install; whether the valve plate is opened or closed can be selected according to down-hole working condition, so the service life of the casing valve is effectively prolonged, and the efficiency and the safety of the unbalanced drilling are improved.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering underbalanced drilling, in particular to an intelligent control casing valve applied to underbalanced drilling / well completion. Background technique [0002] With the increasing demand for oil and gas resources and the continuous improvement of drilling technology, underbalanced drilling technology has been in-depth research and continuous development. Underbalanced drilling technology has many advantages. It can effectively solve the problem of polluting oil and gas layers caused by traditional drilling, greatly reduce the damage to the formation caused by drilling, reduce lost circulation, increase the rate of penetration, and shorten the well construction period. Effectively discover concealed oil and gas layers, etc. However, most of the current underbalanced drilling only achieves underbalance during the drilling process, and in the completion of well operations, they all use t...

Claims

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Application Information

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IPC IPC(8): E21B34/06
Inventor 范永涛周俊然王益山吴欣袁杨晓勇张耕培李萍
Owner BC P INC CHINA NAT PETROLEUM CORP
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