Plugging technology for highly-deviated well with big casing pipe

A highly deviated well technology technology, applied in sealing/isolation, wellbore/well components, earthwork drilling and production, etc., can solve problems such as imperfect plugging technology and ineffective displacement of high-viscosity and high-specific-gravity mud , to achieve the effect of convenient redevelopment

Inactive Publication Date: 2013-07-03
陈美玲
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Problems solved by technology

Sealing the target layer with suspended ash plugs is a very common operation in petroleum development, and ash injection in small casings of 51 / 2″ and below has been mature, but large casings (7″ and above casings), large-slope The plugging technology for high-degree wells (well inclination greater than 30°) is not yet perfect
In view of the special flow of cement slurry in the wellbore with large diameter, it mainly manifests as laminar flow of cement slurry in inclined wells and horizontal wells, which cannot effectively displace high-viscosity and high-specific-gravity mud, so that the conventional ash injection method cannot be used well. achieve the blocking effect

Method used

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Embodiment Construction

[0023] (1) Suspended cement plug. Effects of gravitational differentiation. When the cement slurry is solidified in the highly inclined well section, due to the action of gravity, it becomes thin at the top and thick at the bottom. The cement stone on the upper side has low strength and high permeability, which easily causes oil, gas and water to channel.

[0024] Cement shrinks as it solidifies. For raw cement, the shrinkage rate is as high as 2.5%, so the shrinkage of cement solidification is likely to produce micro-pores between the cement plug and the inner wall of the casing in the inclined well section, thereby affecting the plugging effect of the cement plug.

[0025] replacement efficiency issues. In a deviated well, due to the influence of gravity, the heavy cement slurry (usually the cement slurry is heavier than the well killing fluid or mud) always sinks to the low side, and the cement slurry forms a fingering phenomenon on the low side, while the light fluid (su...

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Abstract

The invention relates to a plugging technology for a highly-deviated well with a big casing pipe. In consideration of the flow particularity of cement paste in a wellhole with large radius, the cement paste flows in a similar laminar flow way in a deviated well and a horizontal well, and mud with high viscosity and high specific gravity cannot be effectively driven and displaced, so that a conventional ash filling way cannot reach a better plugging effect. The plugging technology forming a suspended ash plug for the highly-deviated well with the big casing pipe is an economic and most effective plugging mode, and later redevelopment can be convenient and safe.

Description

Technical field: [0001] The invention relates to a large casing and high-inclination well plugging technology, which belongs to the technical field of petroleum exploitation. Background technique: [0002] At home and abroad, there are not many studies on plugging technology of suspended ash plugging in large casing and high-inclination wells using high specific gravity mud as the killing fluid, and the related model research in the laboratory is basically blank. Sealing the target layer with suspended ash plugs is a very common operation in petroleum development, and ash injection in small casings of 51 / 2″ and below has been mature, but large casings (7″ and above casings), large-slope The plugging technology for high-degree wells (well inclination greater than 30°) is still not perfect. In view of the special flow of cement slurry in the wellbore with large diameter, it mainly manifests as laminar flow of cement slurry in inclined wells and horizontal wells, which cannot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/134E21B33/13
Inventor 戈宝富庄欢乐吕序荣乔建刘加东梅满春王国平
Owner 陈美玲
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