Incipient flow rate of cuttings in horizontal well annulus considering random distribution characteristics of particles

被引：0
|
作者：
Chen Y. [1 ,2 ]
Zheng Y. [2 ]
Zeng B. [1 ,2 ]
Fan Y. [3 ]
Wu P. [1 ,2 ]
Wang X. [1 ,2 ]
机构：
[1] Shale Gas Research Institute, PetroChina Southwest Oil & Gasfield Company, Sichuan, Chengdu
[2] PetroChina Southwest Oil & Gasfield Company, Sichuan, Chengdu
[3] Engineering Technology Research Institute, PetroChina Southwest Oil & Gasfield Company, Sichuan, Chengdu
来源：
Natural Gas Industry | 2022年 / 42卷 / 10期
关键词：
Critical flow rate; Horizontal well; Incipient particle motion; Random distribution of cuttings; Shale gas; Solid–liquid two-phase flow;
D O I：
10.3787/j.issn.1000-0976.2022.10.010
中图分类号：
学科分类号：
摘要：
Horizontal well drilling has been widely used for the development of shale gas. In the process of horizontal well drilling, however, cuttings in the annulus tend to settle in the low side of the wellbore to form a cuttings bed, which leads to high drag and torque and frequent pipe sticking and burying. At present, the influences of the random distribution characteristics of cuttings particles in the annulus on the incipient flow rate are less researched, and their force and action laws are not analyzed completely. In order to understand the incipient flow rate and laws of cuttings bed particles and ensure the safety of wellbore flow, this paper introduces the random particle distribution function to determine the percentage of incipient particle motion, and establishes the starting mechanical models of cuttings rolling and lifting by considering net gravity, drag force, lift force, additional mass force, adhesive force of solid particle, fluid pressure loss, static pressure of drilling fluid and Van der Waals force. Based on this, the action laws of each influential factor are analyzed, and the model is validated using existing experimental data. And the following research results are obtained. First, an incipient flow rate is higher in the lifting mode than that in the rolling mode. When the bed is thin enough, the corresponding flow rate is the minimum flow rate of drilling fluid with no cutting bed generated. Second, the incipient flow rate of cuttings particle increases first and then decreases with the increase of its size, and the critical particle size is about 1.1 mm. Third, the required incipient flow rate of cuttings particle increases with the increase of relative hidden degree of cuttings particle, density of cuttings, effective viscosity of drilling fluid, eccentricity of drill string and percentage of incipient particle motion, but decreases with the increase of hole deviation angle. In conclusion, these research results can provide technical support for hydraulic parameter design of shale-gas horizontal wells and cuttings migration understanding and ensure the safe and fast drilling of shale-gas horizontal wells. © 2022 Natural Gas Industry Journal Agency. All rights reserved.
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页码：107 / 114
页数：7
相关论文
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