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Special-shaped pipe drilling fluid rheological property measurement method

A measurement method and drilling fluid technology, applied in the direction of DC flow characteristic measurement, etc., can solve the problem that cannot meet the needs of automatic measurement of drilling fluid rheology in the field, and achieve the effect of being conducive to automatic measurement, solving sensitivity reduction, and reducing particle blockage.

Active Publication Date: 2013-05-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The current conventional drilling fluid rheology test methods, whether it is the rotary method or the pipe flow method, cannot meet the needs of automatic measurement of drilling fluid rheology on site.

Method used

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  • Special-shaped pipe drilling fluid rheological property measurement method
  • Special-shaped pipe drilling fluid rheological property measurement method
  • Special-shaped pipe drilling fluid rheological property measurement method

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Embodiment Construction

[0034] The present invention will be described in detail below with reference to the drawings and embodiments.

[0035] Reference to the overall implementation plan figure 1 with figure 2 .

[0036] Step S1 to construct a special-shaped tube: the process starts at step S1, which constructs a structure composed of figure 2 The special-shaped tube shown is composed of a flat elliptic tube 1 and a flat elliptic cylinder. A flat elliptic annulus is formed between the flat elliptic tube and the flat elliptic cylinder; two flush membrane pressure sensors are installed on the flat elliptic tube wall, The distance between the flush membrane pressure sensor and the two ends of the flat oval tube is more than 10 times the hydraulic diameter.

[0037] Step S2: Measure the geometric parameters of the special-shaped tube: first measure the two semicircular radii r of the flat oval section formed by the inner wall of the flat oval tube 1 1 And the common tangent length b; secondly, determine the...

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Abstract

The invention discloses a special-shaped pipe drilling fluid rheological property measurement method with the advantages of simple operation and accurate measurement. The method can be used in in-situ drilling fluid rheological property automated on-line measurement. A technical scheme provided by the invention comprises the steps of: special-shaped pipe construction; special-shaped pipe geometric parameter measurement; drilling fluid flow rate preliminary determination; actual flow rate and pressure loss measurement, n value calculation; velocity gradient correction; shear stress calculation; flow pattern determination; rheological parameter calculation; and test result recording. With the special-shaped pipe drilling fluid rheological property measurement method provided by the invention, problems during drilling fluid measurement by using conventional pipe flow method are solved; measurement precision is improved; and operation is simple. The method can be used in automated in-situ drilling fluid rheological property on-line measurement.

Description

Technical field [0001] The invention belongs to the field of drilling fluid rheology measurement, in particular to a special-shaped tubular drilling fluid rheology measurement method. Background technique [0002] The rheology of drilling fluid generally includes fluid viscosity, static shear force, dynamic shear force and shear dilution characteristics. The mastery and adjustment of these rheological properties have a very important relationship with improving drilling speed and downhole safety. The rheology of the drilling fluid is related to (1) the ability of the drilling fluid to carry drill cuttings and clean the wellbore; (2) the suspension capacity; (3) the stabilizing effect on the borehole wall; (4) the optimal design of drilling parameters-bit water horsepower Design and calculation of cycle pressure loss, etc. Therefore, the measurement and research of drilling fluid rheology and rheology have been paid much attention. [0003] There are many methods for measuring rh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/08
Inventor 刘保双王中杰李公让乔军
Owner CHINA PETROLEUM & CHEM CORP
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