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Well cementing and leaking stoppage method

A plugging method and cementing technology, which are used in earth-moving drilling, wellbore/well components, sealing/isolation, etc. The effect of improving quality and reducing complexity of use

Pending Publication Date: 2022-05-20
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in related technologies, the swabbing phenomenon that occurs when the drilling tool is pulled out causes the cement slurry to mix with the drilling fluid (such as mud), which affects the quality of cementing plugging. Phenomenon"

Method used

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  • Well cementing and leaking stoppage method
  • Well cementing and leaking stoppage method
  • Well cementing and leaking stoppage method

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Embodiment Construction

[0049] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of approaches consistent with aspects of the application as recited in the appended claims.

[0050] Please refer to figure 1 , which shows a flowchart of a cementing and plugging method provided by an embodiment of the present application. The method may include the following steps (steps 110-140):

[0051] Step 110, control the lower end of the conduit to reach a preset depth in the formation; wherein, the upper end of the conduit communicates with the lower end of the first part of the release device, and the upper end of the first part of the release device communicates with the second part of the release device. The lower end is connected, and the upper end of the...

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Abstract

The invention discloses a well cementation and leakage stoppage method, and belongs to the technical field of well cementation and leakage stoppage. The method comprises the steps that the lower end of the guide pipe is controlled to reach the preset depth in the stratum; wherein the upper end of the guide pipe is communicated with the lower end of the first part in the disengaging device, the upper end of the first part in the disengaging device is communicated with the lower end of the second part in the disengaging device, and the upper end of the second part in the disengaging device is communicated with the drill rod; cement paste is pumped into the drill rod, so that the cement paste blocks well leakage occurring in the stratum; under the condition that the pumping amount of the cement paste reaches the preset pumping amount, the upper end of a first part in the disengaging device is controlled to be disengaged from the lower end of a second part in the disengaging device; and pulling out the drill rod and releasing the second part in the device. According to the embodiment of the invention, drilling fluid can be prevented from flowing out of the drill rod when the drill rod is pulled out, cement paste is prevented from being polluted, and the well cementation and leaking stoppage quality is improved.

Description

technical field [0001] The embodiments of the present application belong to the technical field of well cementing and plugging, and in particular relate to a method for cementing and plugging. Background technique [0002] Lost circulation often occurs during oilfield drilling. Lost circulation refers to the phenomenon that mud, cement slurry or other working fluids are lost into the formation during the drilling process. [0003] In order to achieve a better oilfield drilling effect, operations such as well cementing and plugging are required to solve the negative effects of lost circulation. Usually, the cementing plugging process is realized by drilling tools. First, the drilling tool is sent into the lost zone where lost circulation occurs; then, the cementing slurry is injected; then, the drilling tool is pulled out quickly. After the cement slurry solidifies, the purpose of plugging lost circulation and well cementing can be achieved. [0004] However, in related t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 曾艳春靳树忠戴运才任海阳柳进吕楠王佳露杨慧娟张铁铭张昕冉李苗孙永明李迪洋路晓峰
Owner BC P INC CHINA NAT PETROLEUM CORP
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