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A Method of Determining Wellbore Cleaning Effectiveness in Contoured Wellbores
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A technology of cleaning effect, special-shaped well, applied in wellbore/well components, flushing wellbore, earth-moving drilling, etc., can solve problems such as poor accuracy, and achieve the effect of overcoming insufficient accuracy and safe and efficient drilling
Active Publication Date: 2021-01-29
CHINA PETROLEUM & CHEM CORP +1
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[0006] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, provide a method for determining the wellbore cleaning effect in special-shaped wellbore, and solve the accuracy of the drilling field experience method or the annulus hydraulic method based on regular wellbore For poorer problems, aiming at the abnormal shape of the borehole, based on the principle of solid-liquid two-phase flow, the numerical calculation method is used to more accurately judge the possible accumulation position of cuttings, and the cleaning effect of the borehole is obtained by analysis
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Embodiment 1
[0082] (1) Based on the basic drilling parameters, the geometric model of the special-shaped wellbore is established, and the calculation area is determined.
[0083] The basic drilling parameters obtained are shown in Table 1:
2800 Cuttings equivalent diameter Dd,m 0.005 Diameterexpansion rate of special-shaped wellbore 100％ Initial cuttings concentration at borehole enlargement 10％
[0085] Table 1
[0086] Irregular wellbore shapes such as figure 2 shown.
[0087] (2) Divide the grid according to the geometric model of the special-shaped wellbore, and refine the grid at the place where the shape of the wellbore changes, such as image 3 shown.
[0088] (3) Take the drilling fluid sample from the elevated tank in front of the v...
Embodiment 2
[0101] (1) Based on the basic drilling parameters, the geometric model of the special-shaped wellbore is established, and the calculation area is determined.
[0102] The basic drilling parameters obtained are shown in Table 4:
2600 Cuttings equivalent diameter Dd,m 0.005 Diameterexpansion rate of special-shaped wellbore 100％ Initial cuttings concentration at borehole enlargement 10％
[0104] Table 4
[0105] (2) Divide the grid according to the geometric model of the special-shaped wellbore, and refine the grid at the place where the shape of the wellbore changes, such as Figure 9 shown.
[0106] (3) Take the drilling fluid sample from the elevated tank in front of the vibrating screen, and measure the reading θ of the drilling fluid at different rotational speeds...
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Abstract
The invention provides a method for calculating the wellbore cleaning effect in special-shaped wellbore based on computational fluid dynamics, and belongs to the field of oil and gas exploration and development drilling. In this method, the geometric model of the special-shaped wellbore is first established based on the basic drilling parameters, and then the cuttings concentration distribution at each position of the wellbore in a steady state is obtained through numerical calculation, and finally the cleaning effect of the wellbore is determined through the cuttings concentration distribution. The method of the invention can accurately calculate the flow state of the drilling fluid and the cuttings concentration distribution in the special-shaped wellbore, judge the position where the cuttings may accumulate, guide the reasonable measures for the cleaning of the wellbore, and realize safe and efficient drilling.
Description
technical field [0001] The invention belongs to the field of petroleum and natural gas exploration, development and drilling, and in particular relates to a method for determining the cleaning effect of a wellbore in a special-shaped wellbore. Background technique [0002] Drilling fluid, as the circulating flushing medium in the drilling process, is one of the important factors affecting the success or failure of drilling and the speed of mechanical drilling, and plays a very important role. The wellbore cleaning effect refers to the condition of cuttings carried by the drilling fluid circulation process. Wellbore cleaning effect is directly related to many aspects such as wellbore purification, drilling speed and downhole safety, and is a very important drilling parameter. [0003] Under ideal conditions, the shape of the wellbore is a regular cylinder. However, in the actual drilling process, the shape of the wellbore often has an abnormal phenomenon of diameter expansi...
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