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A method for drilling open holes in shale formations

A mud shale and stratum technology, applied in the field of drilling, can solve complex and changeable drilling bit sticking, well wall collapse accidents cannot be effectively resolved, etc., to achieve the effect of improving the success rate and avoiding drilling accidents

Active Publication Date: 2021-06-25
XINJIANG ZHENGTONG OIL & GAS CO LTD
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Problems solved by technology

[0004] However, after the well collapse incident, due to the complex and changeable actual situation on the site, it is easy to have the drill bit sticking phenomenon, or draw a new wellbore, and the well wall collapse accident cannot be effectively solved, which will cause great trouble to the later construction

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  • A method for drilling open holes in shale formations
  • A method for drilling open holes in shale formations
  • A method for drilling open holes in shale formations

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Embodiment 1

[0064] 1. Basic overview:

[0065] Well J10021_H, the design well depth is 4939.51m, the actual well depth is 4937m, the third well section is 215.9mm drill bit + 139.7mm reservoir casing. It was opened at 8:00 on April 2, 2019 and completed at 14:30 on September 2, 2019.

[0066] After the drilling was completed on August 5, 2019, the well was drilled in two trips. The first trip through the well adopts the roller cone single-supported drilling tool assembly, which includes successively connected roller cone bits, double female joints, 212mm centralizers, 2 strings of heavy drill pipes, 60 strings of drill pipes, and heavy drills 18 strings of rods and drill pipes were blocked when they were drilled through the well to 3840m. During the reaming process, the drill stuck twice. The second trip through the well adopts the roller-cone double-supported drilling tool assembly. The roller-cone double-supported drilling tool assembly includes successively connected roller cone bits...

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Abstract

The invention relates to an open-hole well drilling method for drilling a shale formation, which comprises the following steps: in the drilling process, if the well wall collapses, it is judged whether the well wall collapse occurs in the shale formation; if the well wall collapse occurs in the shale formation; For muddy shale formations, a milling cone drilling tool assembly is used for well drilling, wherein the drill bit of the milling cone drilling tool assembly is a tapered milling shoe. The beneficial effect is that, in view of the well wall collapse phenomenon in the mud shale formation, the milling cone drilling tool assembly is used for open-hole drilling, which reduces the well collapse and sticking caused by the drill bit, and the problem of delineating a new wellbore is not easy to occur.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to a well drilling method. Background technique [0002] When water-based drilling fluid is used to drill shale wells, downhole complex accidents such as well wall instability and collapse are prone to occur. This is due to the pressure difference, temperature difference, chemical potential difference and formation capillary Driven by pressure, etc., entering the formation near the borehole wall increases the formation collapse pressure and reduces the formation rock strength. For strong water-sensitive shale formations, hydration will occur after the formation rocks contact with water, resulting in hydration dispersion and hydration expansion, resulting in the instability and collapse of the wellbore. For hard and brittle shale formations, the content of water-sensitive minerals in formation rocks is very low, and hydration is not easy to occur, but the inva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/28
CPCE21B7/28
Inventor 牟善波李靖李会民王晓宏韩秀玲沈卫平李先林
Owner XINJIANG ZHENGTONG OIL & GAS CO LTD
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