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Control method of Casson model drilling fluid rheological parameters

A rheological parameter and control method technology, which is applied in earthwork drilling, wellbore flushing, wellbore/well components, etc., can solve problems such as complicated methods, unsuitable on-site real-time operation, and large amount of calculation

Inactive Publication Date: 2014-03-12
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide a control method for rheological parameters of drilling fluid in Cason mode, so as to solve the problems in the existing control method that the calculation amount is large, the method is complicated, and it is not suitable for real-time operation on site

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  • Control method of Casson model drilling fluid rheological parameters
  • Control method of Casson model drilling fluid rheological parameters
  • Control method of Casson model drilling fluid rheological parameters

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Embodiment Construction

[0036] The control method of rheological parameters of drilling fluid in Carson mode, the specific steps are as follows:

[0037] Step 1: Determine the drilling fluid Casson yield value τ according to the borehole size, borehole expansion ratio, annular space, solid particles and mud pump displacement c and Carson viscosity η ∞ reasonable range of values;

[0038] Step 2: Collect drilling fluid samples in the mud tank in front of the vibrating screen, measure the readings θ at N different speeds Φ with a rotational viscometer, and record the N different speeds Φ and the corresponding readings θ;

[0039] Step 3: Convert the different rotational speeds Φ and corresponding readings θ obtained in step 2 into corresponding shear rate γ and shear stress τ according to the instrument constant of the rotational viscometer;

[0040] Step 4: Based on the data in Step 3, estimate the Carson yield value τ c and Carson viscosity number η ∞ , to get the Carson yield estimate and the ...

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Abstract

The invention relates to a control method of Casson model drilling fluid rheological parameters, which comprises the following steps: firstly determining a reasonable value range of the rheological parameters, measuring read values of drilling fluid at different rotational speeds through a rotational viscometer, converting to corresponding shearing rates and shearing stresses, estimating the rheological parameters, performing a field small-scale test according to the result of judging whether the estimated value is in the set value range or not and determining the adjustment treatment measures of the drilling fluid, wherein the estimation of the rheological parameters is based on a least square method, a unitary target function P (a) about a is established through mathematical manipulation, and a one-dimensional search method is utilized for solving the value of a so as to enable the P (a) to take the minimum value and further determine a Casson yield value and a Casson viscosity estimated value. The method considers various factors to set the reasonable value range of the rheological parameters, the reasonable judgment is made against adjustment of the drilling fluid by improving the estimation precision of the rheological parameters, and the field small-scale test is utilized for determining the maintenance treatment measures of the drilling fluid, thereby saving the using quantity of a treating agent and reducing the well drilling cost.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, and relates to a method for controlling the rheological parameters of drilling fluid conforming to the Cason model. Background technique [0002] In the field of oil and gas drilling, drilling fluid is likened to the blood of drilling. It is closely related to drilling speed, drilling cost and drilling parameters. The performance of drilling fluid is one of the important factors for the success of drilling. In general, drilling fluids are non-Newtonian fluids, and those that conform to the Casson rheological model are called Casson fluids. The Casson model was proposed by Carson in 1959 and is one of the commonly used rheological models. For various types of drilling fluids (see page 76 of the literature "Drilling Fluid Technology", edited by Yan Jienian, China University of Petroleum Press, 2000), the rheological equation is Its rheological parameter τ c Called Carson's dynamic shear force...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/08
Inventor 闫吉曾郑锋辉狄伟邓红琳
Owner CHINA PETROLEUM & CHEM CORP
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