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Local underbalanced drilling recycling device

An underbalanced drilling and recirculation device technology, applied in drilling equipment, drill pipes, drill pipes, etc., can solve the problems of increasing surface blowout out of control and high formation pressure, so as to reduce sand settling and sticking, protect oil and gas reservoirs, and reduce drilling cost effect

Active Publication Date: 2018-04-20
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In underbalanced drilling, the rotary control head is used to control the fluid flow for drilling operations. In addition, the formation pressure is relatively high, which increases the risk of out-of-control surface blowout caused by equipment failure.

Method used

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Embodiment Construction

[0041] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art Modifications to various equivalent forms of the present invention fall within the scope defined by the appended claims of the present application.

[0042] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar exp...

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Abstract

The invention discloses a local underbalanced drilling recycling device. The local underbalanced drilling recycling device comprises coiled oil tubing, a coiled oil tubing connector, a coiled tubing connector, a top joint of a drill bit, the drill bit, and backflow pup joints; the coiled oil tubing connector is connected to the lower end of the coiled oil tubing; the coiled oil tubing connector issleeved with the coiled tubing connector, and the coiled tubing connector is connected with the coiled oil tubing connector in a clamping mode; the coiled tubing connector is sleeved with the top joint of the drill bit, a ring cavity is formed between the top joint of the drill bit and the coiled tubing connector, and bearings are disposed inside the ring cavity; the drill bit is connected to thelower end of the top joint of the drill bit, and a spray nozzle is formed in the drill bit; the backflow pup joints are connected to the upper end of the top joint of the drill bit; reflowing valvesare formed in the side walls of the backflow pup joints; drilling rods are connected to the upper end of the backflow pup joints; and a penetrating internal flow passage is formed between the coiled oil tubing and the drill bit. When drilling with the local underbalanced drilling recycling device, under the premise of local underbalanced drilling in the well bottom, microannular high-efficient solid-carrying is realized, the stability of the wellbore in the upper well section can be ensured, the well control is better achieved, and the drilling speed is improved.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a return flow device for local underbalanced drilling. Background technique [0002] With the large-scale exploitation of fossil energy such as oil and gas, people are mainly concerned about how to reduce formation damage in the process of exploitation. Underbalanced drilling has been widely used in the above background. Specifically, underbalanced drilling is a drilling technique that can increase the rate of penetration and reduce lost circulation in depleted reservoirs. Compared with drilling horizontal wells by conventional methods, the use of underbalanced drilling technology can not only increase the production of horizontal wells by about 10 times, but also the underbalanced coiled tubing drilling technology has unique advantages, suitable for shallow oil and gas reservoirs, slim hole drilling, and old well deepening And sidetracking, especially sidetracking h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00E21B17/046
CPCE21B17/046E21B21/00
Inventor 史怀忠陈振良赵贺谦侯新旭王朝辉周士杰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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