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Drilling acceleration method in shale formation

A technology for shale reservoirs in the formation, applied in drilling equipment and methods, drill bits, drilling equipment, etc., can solve the problems of slow drilling time and low drilling speed

Active Publication Date: 2019-03-08
胜利油田博友泥浆技术有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for accelerating drilling in shale formations, to solve the problems of slow drilling and low drilling speed in shale reservoirs in the prior art, and to improve drilling speed in shale formations. The purpose of drilling speed and improving engineering efficiency

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  • Drilling acceleration method in shale formation

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Effect test

Embodiment 1

[0027] Such as figure 1 A method for accelerating drilling in a shale formation is shown, comprising the following steps:

[0028] (a) Use the PDC bit to drill to a vertical depth of 5-10m from the top of the shale reservoir according to the designed wellbore trajectory. During the drilling process, the viscosity of the drilling fluid is A, in centipoise; the density is B, in g / cm 3 ;Statistics The average drilling speed in the last 24 hours during the drilling process is X, the unit is m / h; the average speed of the drill pipe is Y, the unit is rpm; the average drilling pressure is Z, the unit is ton; the average displacement is Q, the unit is L / min ; Cycle, trip out, replace the bit with a tricone bit equal in diameter to the PDC bit, and use a new screw drilling tool in the BHA;

[0029] (b) Drill down to the bottom of the well, explore sand, drill into the shale reservoir, continue drilling with the speed Y, weight on bit Z, and displacement Q, and monitor the average dr...

Embodiment 2

[0035] Such as figure 1 A kind of drilling acceleration method in the shale formation shown, on the basis of embodiment 1, the displacement when displacing heavy slurry and thick slurry in step (d) is Q', described Q' / Q= 0.6; after the thick slurry is completely returned from the wellhead, increase the displacement to Q again. The displacement when replacing the slurry in step (e) is Q", said Q" / Q=1.4; after the slurry is completely returned from the wellhead, reduce the displacement to Q again. The slurry returns from the wellhead, and after the cuttings are screened out by the vibrating screen, it no longer enters the drilling fluid circulation pool. After the slurry is screened out of cuttings by a vibrating sieve, it enters a waste oil tank for recovery.

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Abstract

The invention discloses a drilling acceleration method in a shale formation. For a well of which a drilling speed is not significantly decreased after a shale reservoir is entered, regularly substituted low viscosity drilling fluid can improve the erosion ability to the shale formation, and sticky shale cementing agents on a bottom hole assembly are regularly cleaned, so that the possibility of occurrence of a bit balling phenomenon is greatly reduced, and in turn, effective application of drilling pressure to the formation is ensured; and for a well of which the drilling speed is significantly decreased after the shale reservoir is entered, the combination of sweeping heavy slurry and sweeping thick slurry is adopted and has an extremely high cleaning ability on hard-to-carry rock debrisattached to a well wall, the cleanliness in a wellbore is greatly improved, the increased drilling pressure can be effectively applied to the bottom of the well through a drill bit, the problems of slow drilling and low drilling speed in the shale reservoir in the prior art are solved, and the purposes of increasing the drilling speed in shale reservoir and improving the engineering efficiency through engineering means and the cooperation of the replacement effect of different drilling fluid are realized.

Description

technical field [0001] The invention relates to the field of drilling engineering, in particular to a method for accelerating drilling in shale formations. Background technique [0002] Shale gas refers to unconventional natural gas that occurs in organic-rich shale-dominated reservoir rock series. It is continuously generated biochemical gas, thermogenic gas or a mixture of both, and can exist in natural fractures in a free state. It exists in the surface of kerogen and clay particles in an adsorbed state, and a very small amount is stored in kerogen and asphaltene in a dissolved state. The proportion of free gas is generally 20% to 85%. Shale gas is natural gas extracted from shale formations. The main body is located in dark mud shale or high-carbon mud shale. Shale gas mainly exists in mudstone, high-carbon mudstone, shale and silt in an adsorbed or free state. Natural gas in sandy rock interlayers, which can be generated in various stages of organic origin, exists in f...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B7/04E21B10/08E21B21/00
CPCE21B7/00E21B7/04E21B10/08E21B21/00
Inventor 张远香
Owner 胜利油田博友泥浆技术有限责任公司
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