A complex formation pretreatment process

A complex formation and pretreatment technology, applied in wellbore/well components, drilling equipment and methods, and production fluids, etc., can solve the problems of easy slippage of the expansion pipe, unsatisfactory sealing effect, and limited expansion force, etc. To achieve the effect of reducing construction risk and construction difficulty, reducing construction cost and good expansion effect

Active Publication Date: 2019-03-15
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

It overcomes the shortcomings of the existing expansion tube sealing formation method, such as limited expansion force, easy slippage of the expansion tube, serious wear of the rubber tube, and unsatisfactory plugging effect

Method used

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  • A complex formation pretreatment process
  • A complex formation pretreatment process
  • A complex formation pretreatment process

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Embodiment Construction

[0020] Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, a complex formation pretreatment process, the process steps are as follows:

[0021] 1. After drilling into complex formations, first start the reaming tool while drilling to perform sizing and reaming of complex formations and within the range of 3 to 5 meters above and below;

[0022] 2. The first expansion process: the solid expansion pipe 8 is lowered so that the two ends of the solid expansion pipe 8 are located at a position of 3 to 5 meters above and below the complex formation, and the expansion system is lowered at the position of the complex formation; the expansion system includes the central pipe 7, The upper end of the central pipe 7 is connected with the drilling tool 10, the lower end of the central pipe 7 is connected with the piston tension rod 13, the upper end of the piston tension rod 13 is connected with the upper thrust piston 6, and...

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Abstract

The invention relates to the technical field of stratum blocking through expansion pipes, in particular to a pretreatment process for a complex stratum. The process comprises the steps that firstly, when drilling is conducted and meets the complex stratum, a reaming-while-drilling tool is started firstly to conduct sizing reaming on the complex stratum and within the range 3-5 m away from the complex stratum in the vertical direction; secondly, the first expansion process is carried out, specifically, a solid expansion pipe is put, the two ends of the solid expansion pipe are located in the position 3-5 m away from the complex stratum in the vertical direction, and an expansion system is put into the position of the complex stratum. The expansion pipe can be anchored on the well wall. The expansion pipe body and threads do not need to bear high pressure. A locating mechanism is arranged between an expansion tool and the expansion pipe, so that sliding of the expansion pipe is avoided; the expansion force is strong; the expansion effect is good; effective blocking can be conducted on the complex stratum; follow-up operation is not influenced; bottom plug drilling and milling of are not needed; the construction risk and construction difficulty are reduced; and the construction cost is reduced.

Description

Technical field: [0001] The invention relates to the technical field of formation plugging by expansion pipes, in particular to a complex formation pretreatment process. Background technique: [0002] With the continuous development of oil exploration and development to deep, ultra-deep and complex formations, more and more lost zones, collapsed zones and high-pressure zones are encountered during drilling. During the drilling process, the situation of vicious lost circulation and well wall collapse cannot be effectively dealt with, which brings serious consequences to the drilling team, such as prolonging the drilling cycle, increasing the cost, and even failing to reach the target layer. Therefore, it is of great significance to study new technologies to pretreat complex formations, reduce drilling costs, and promote exploration and development progress. [0003] The pretreatment technology of complex formations with equal diameter is a new technology developed rapidly un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/10E21B7/28
CPCE21B7/28E21B43/103E21B43/105
Inventor 钟勇王春杰吴兴国丁文正朱太辉陈思路薛志永杨行夏方杰王磊崔志强霍爱莉
Owner BC P INC CHINA NAT PETROLEUM CORP
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