A Drilling Fluid Density Determination Method for Special-shaped Hole Cleaning

A technology of drilling fluid density and determination method, applied in the direction of design optimization/simulation, etc., to achieve the effect of safe and efficient drilling and reasonable control

Active Publication Date: 2021-08-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, provide a method for determining the density of drilling fluid that meets the requirements of special-shaped wellbore cleaning, and solve the problem of adjusting the density of drilling fluid on the drilling site only based on experience or based on regular wellbores

Method used

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  • A Drilling Fluid Density Determination Method for Special-shaped Hole Cleaning
  • A Drilling Fluid Density Determination Method for Special-shaped Hole Cleaning
  • A Drilling Fluid Density Determination Method for Special-shaped Hole Cleaning

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Effect test

Embodiment 1

[0076] (1) Obtain the basic drilling parameters as shown in Table 1.

[0077] Drill diameter D b , m

0.216 Drill pipe outer diameter Dp,m 0.127 cuttings density ρ d ,kg / m 3

2900 Cuttings equivalent diameter Dd,m 0.005 Well diameter enlargement rate 100％ Initial cuttings concentration at borehole enlargement 10％

[0078] Table 1

[0079] (2) Establish the geometric model of the special-shaped wellbore, divide the grid, and intensify the grid at the special-shaped wellbore, such as figure 2 shown;

[0080] (3) Drilling fluid samples were taken at the elevated trough, and a set of shear rate and shear force were measured with a rotational viscometer, as shown in Table 2:

[0081] Rotational viscometer speed, r / min 600 300 200 100 6 3 Shear rate, / s 1022 511 340.7 170.3 10.2 5.11 Rotational viscometer reading θ 172 128 99 71 36 27 Shear force τ, Pa 87.9 65.4 50.6 36.3 18.4 13.8...

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Abstract

The invention provides a method for determining the density of drilling fluid that satisfies the need for cleaning special-shaped well holes, and belongs to the field of oil and gas exploration and development drilling. This method first establishes the geometric model of the special-shaped wellbore based on the basic drilling parameters, sets the initial drilling fluid density, and then obtains the cuttings concentration distribution at each position of the wellbore in a stable state through numerical calculation, and judges whether the wellbore cleanliness is satisfied by the cuttings concentration distribution. effect, and judge whether the drilling fluid density is within the density range that can be configured on the construction site. Within the configured density range, the drilling fluid density at this time is the final drilling fluid density. The present invention can overcome the shortcomings of the existing experience method or annular space fluid mechanics method, and solve the problem of insufficient accuracy of adjusting the density of drilling fluid based on experience or based on regular boreholes at the drilling site.

Description

technical field [0001] The invention belongs to the field of drilling for oil and gas exploration and development, and in particular relates to a method for determining the density of drilling fluid that meets the requirement of cleaning special-shaped well holes. Background technique [0002] Drilling fluid is a fluid medium that circulates and carries cuttings during drilling. Wellbore cleanliness refers to the state of cuttings carried in the wellbore during drilling. The state of cuttings carrying in drilling is directly related to drilling speed and downhole safety, and is a very important drilling parameter. During the drilling process, if the cuttings cannot be carried out of the wellbore in time, it may cause downhole complex situations such as difficulty in running in, incomplete running in, and sticking. Therefore, wellbore cleaning has become the primary issue of safe and fast drilling. [0003] Practice has shown that parameters such as the shape of the wellbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
Inventor 路保平陈曾伟林永学刘四海张凤英
Owner CHINA PETROLEUM & CHEM CORP
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