Loess formation conduit plugging and annulus external fill balance anti-leakage process

A technology of loess layer and conduit, which is applied in the field of oil drilling, can solve the problems of large water loss in the polymer leakage prevention system, unsatisfactory plugging process effect, and difficult secondary sealing, so as to avoid the risk of wellhead operations by personnel, The effect of saving production time and preventing the loss of loess layer

Active Publication Date: 2014-06-04
中国石油集团川庆钻探工程有限公司长庆钻井总公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to aim at the conventional leakage prevention of the Quaternary loess layer in the Jingnan area of ​​the Jingbian gas field in Changqing. The secondary sealing is difficult, the polymer leak-proof system loses a lot of water, which induces the loss of loess layer, and the effect of conventional plugging technology is not ideal. We provide a balanced leak-proof technology for loess layer conduit seat plug and annular space external irrigation, which is effective prevent the loss of shallow loess layer

Method used

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  • Loess formation conduit plugging and annulus external fill balance anti-leakage process
  • Loess formation conduit plugging and annulus external fill balance anti-leakage process
  • Loess formation conduit plugging and annulus external fill balance anti-leakage process

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Embodiment 1

[0038] A loess layer conduit seat plugging, annulus external irrigation balance leak prevention process, including conduit seat plugging, drilling fluid preparation, annulus external grouting plugging slurry, and surface layer drilling. The preparation of the drilling fluid includes: plugging The preparation of mud leakage 6 and the preparation of drilling fluid,

[0039] ① Preparation of plugging slurry

[0040] Isolate the upper water tank connected to the No. 2 pump from other circulation tanks, inject 50 tons of clean water, turn on the agitator, and prepare the plugging slurry with the low-pressure return water of the No. 2 pump. 2.5 tons of bentonite, 5 tons of HD-1 bridge plugging agent, 15 tons of limestone (CaCO 3 ), 15 tons of barite (BaSO 4 ), 0.08 tons of GD-1 high viscoelastic plugging agent, according to the above order of feeding. Mix well and set aside.

[0041] ②Preparation of first drilling fluid (low solid clay slurry)

[0042] Inject 100 tons of clear...

Embodiment 2

[0044]A loess layer conduit seat plugging, annulus external irrigation balance leak prevention process, including conduit seat plugging, drilling fluid preparation, annulus external grouting plugging slurry, and surface layer drilling. The preparation of the drilling fluid includes: plugging The preparation of mud leakage 6 and the preparation of drilling fluid,

[0045] ① Preparation of plugging slurry

[0046] Isolate the upper water tank connected to the No. 2 pump from other circulation tanks, inject 50 tons of clean water, turn on the agitator, and prepare the plugging slurry with the low-pressure return water of the No. 2 pump. 2.5 tons of bentonite, 5 tons of HD-1 bridge plugging agent, 15 tons of limestone (CaCO 3 ), 15 tons of barite (BaSO 4 ), 0.05 tons of GD-1 high viscoelasticity plugging agent, according to the above order of feeding. Mix well and set aside.

[0047] ②Preparation of first drilling fluid (low solid clay slurry)

[0048] Inject 100 tons of ...

Embodiment 3

[0050] A loess layer conduit seat plugging, annulus external irrigation balance leak prevention process, including conduit seat plugging, drilling fluid preparation, annulus external grouting plugging slurry, and surface layer drilling. The preparation of the drilling fluid includes: plugging The preparation of mud leakage 6 and the preparation of drilling fluid,

[0051] ① Preparation of plugging slurry

[0052] Isolate the upper water tank connected to the No. 2 pump from other circulation tanks, inject 50 tons of clean water, turn on the agitator, and prepare the plugging slurry with the low-pressure return water of the No. 2 pump. 2.5 tons of bentonite, 5 tons of HD-1 bridge plugging agent, 15 tons of limestone (CaCO 3 ), 15 tons of barite (BaSO 4 ), 0.1 tons of GD-1 high viscoelasticity plugging agent, according to the above order of feeding. Mix well and set aside.

[0053] ②Preparation of first drilling fluid (low solid clay slurry)

[0054] Inject 100 tons of c...

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Abstract

The invention discloses a loess formation conduit plugging and annulus external fill balance anti-leakage process, and which relates to the field of petroleum drilling, and loess formation anti-leakage drilling, and is particularly suitable for preventing non-return type leakage occurring in a quaternary system loess formation at the Jingnan area of the Jingbian gas field. Before spud-in, a plugging conduit is manufactured, and annulus external fill leak stopping slurry and low-solid argil slurry for surface-section drilling are prepared. Conduit plugging and annulus external fill of the leak stopping slurry are performed according to a construction sequence of a plugging process, so that a shallow surface layer is closed and isolated, and a conduit pin is compacted and sealed. The low-solid argil slurry is selected by a surface-section drilling fluid system, and rational drilling parameters are matched. By implementing an entire set of process scheme, no return of the shallow surface layer and leakage of the loess formation are effectively prevented.

Description

technical field [0001] The invention relates to a leak-proof technology, in particular to a leak-proof technology for loess layer conduit seat plugging and annulus external irrigation balance, which is suitable for leakage occurring in the Quaternary superficial layer of the Jingnan Block of Changqing Gas Field. It belongs to the field of oil drilling. Background technique [0002] The burial depth of the Quaternary loess layer in the Jingnan area of ​​the Jingbian gas field in Changqing is about 0m to 550m. The shallow surface layer of the loess layer in this block has the characteristics of loose structure, undercompaction, low pressure bearing capacity, and strong permeability. In the process of drilling, lost circulation occurs frequently in the shallow surface layer from 0m to 40m. After a leakage occurs during drilling, the leakage velocity will increase rapidly, resulting in loss of return. Once a leakage channel is formed, it will be difficult to plug the leakage a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13C09K8/48C09K8/24
Inventor 兰正升曹小艺
Owner 中国石油集团川庆钻探工程有限公司长庆钻井总公司
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