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Drilling method for improving low rate of penetration in shale reservoirs

A shale reservoir and drilling speed technology, which is applied in the field of improving the low drilling speed of shale reservoirs, can solve the problems of slow drilling time and low drilling speed, and achieve the elimination of debris accumulation, friction reduction, The effect of increasing drilling speed

Active Publication Date: 2020-04-24
北京中海沃邦能源投资有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Drilling method for improving low rate of penetration in shale reservoirs

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 The shown drilling method for improving the low drilling speed of shale reservoirs is characterized in that it comprises 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, an...

Embodiment 2

[0035] Such as figure 1 The shown drilling method for improving the low rate of penetration of shale reservoirs, on the basis of Example 1, the displacement when replacing heavy slurry and thick slurry in step (d) is Q', and the 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 method for improving the low drilling speed of a shale reservoir. A drilling parameter mode of large drilling pressure in matching with the low speed is utilized, the large drilling pressure is fully applied to the interior of the formation, a tri-cone bit is made to fully peform the rock breaking mechanism, the lower formation is gradually broken and broken, sothe drilling parameters are optimized, and the drilling capability inside the shale reservoir is improved. The use of low-viscosity drilling fluids that are regularly replaced can improve the erosioncapacity of the shale formation, the sticky shale cement on a bottom hole assembly is regularly cleaned, the possibility of mud bagging is greatly reduced, that the drilling pressure is effectively applied to the formation is guaranteed, the drilling rate can be stabilized at a relatively high level during drilling of the shale reservoir, problems of slow drilling speed and low drilling speed in the shale reservoir in the prior art are solved, through the engineering means in combination with the replacement effect of different drilling fluids, the purpose of improving the drilling speed in the shale reservoir and improving engineering efficiency is achieved.

Description

technical field [0001] The invention relates to the field of drilling engineering, in particular to a drilling method for increasing the low drilling speed of shale reservoirs. 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 organi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/08E21B21/00E21B37/00E21B7/00
CPCE21B7/00E21B10/08E21B21/00E21B37/00
Inventor 张远香
Owner 北京中海沃邦能源投资有限公司
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