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Method, equipment and system for drilling

A technology of drilling and injection equipment, which is applied in the cementing and abandonment fields of oil and natural gas drilling, which can solve the problems of polluting shallow water, endangering the ground environment and personal safety, leakage, etc., and achieve the effect of minimizing expansion/contraction

Inactive Publication Date: 2018-11-23
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the above and other situations where cement needs to be injected into the drilling space, cracks may be formed inside the cement or on the interface between the cement and the casing, and the cement and the well wall after the cement solidifies, making the well cemented and abandoned. There are potential safety hazards. For example, underground gas and liquid may leak to the shallow layer or even the ground through cracks under the action of pressure, polluting shallow water, and endangering the ground environment and personal safety.

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  • Method, equipment and system for drilling
  • Method, equipment and system for drilling
  • Method, equipment and system for drilling

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Embodiment Construction

[0030] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0031] Figure 1a is a schematic diagram of filling the filling space of the well with cement, Figure 1b for Figure 1a The cross-sectional view of the structure in section AA'. The three sleeves are respectively: a first (outer) sleeve 102 located on the outermost side, a second sleeve 104 located in the middle, and a third sleeve 106 located inside. The annulus between the first casing 102 and the second casing 104 forms a filling space 101, and the annulus between the second casing 104 and the third casing 105 forms another filling space 103, as shown in the figure As shown by the linear and dotted shaded areas of , both filled spaces are filled with a primary fill material, such as cement.

[0032] Injecting the first filling material such as cement between the casings or between the casing and the well wall is known in the art for well cementing ...

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Abstract

The invention discloses a method, system and filling material injection equipment for the integrity repairing of drilling, the method comprises the following steps: filling a first filling material into the filling space of the drilling; injecting a second filling material into the crack in the first filling material, in the process, the injection pressure of the second filling material is increased and / or decreased, thus, the fissures formed by the first filling material will be filled up by the second filling material in a well cementing and an abandoned well. The filling process designed can overcome the problem of casing expansion, and repair the complete isolation of the formation pressure by an annular cement.

Description

technical field [0001] The invention relates to the treatment of well drilling, in particular to the cementing and well abandonment of oil and natural gas drilling. Background technique [0002] After the oil and natural gas drilling construction is completed, in order to ensure the safety of subsequent drilling, reinforce the well wall, or ensure the safe drilling of the lower wellbore, to achieve the purpose of later drilling to seal off oil, gas and aquifers, it is necessary to carry out the next step. Cementing construction of casing and grouting. [0003] Cement injection may also be required upon well abandonment. An example of the need to abandon a well (wellabandonment) is that when mining underground fossil fuels such as oil or natural gas, water is often produced. In order to increase the ratio of fossil fuels to water, people have developed many technologies to Change the permeability of the formation. These techniques are not always effective, and eventually, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor P·拉塔纳侬江伟军纪鹏赵磊唐川高毅董琳王万林封皓胡紫薇胡雷雷罗庆陆亚慧G·J·M·范艾登J·M·M·肖恩梅克斯
Owner SHELL INT RES MAATSCHAPPIJ BV
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