![]() ![]() The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". ![]() This cookie is set by GDPR Cookie Consent plugin. ![]() ![]() The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is used to store the user consent for the cookies in the category "Other. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. The ability to transmit hydraulic horsepower to the bit.īy properly controlling the flow characteristics, these functions can be achieved without detrimental effects to the stability of the wellbore.Īlthough many factors, in the drilling operation, influence the stability of the wellbore, we will address the annular flow characteristics of the drilling fluid in this paper.Necessary cookies are absolutely essential for the website to function properly. The insurance of information about the formations penetrated and, The minimization of adverse effects to the formations adjacent to thehole The suspension of cuttings and weight material when circulation is interrupted Annular pressure is comprised of friction loss and hydrostatic pressure, and during borehole excavation, it is determined based on the total pump output rate, annular area within the borehole, and drilling a) b) c) 5 fluid rheological properties (Ariaratnam et al., 2007). The transportation of cuttings to surface The drilling fluid functions, which can be related to a fluid's flow, are: By maintaining these properties within a given range, the primary functions of the mud system will be performed. One of the most important aspects of a drilling operation is the proper control of the drilling fluid's flow properties. Using this technique, as a guideline, has greatly reduced our shale related problems. A Reynolds number range of 3100 to 4000 was identified and wells which e x per i en c e d severe crossover had a greater occurrence of shale problems. Once these points are identified, a minimum Reynolds number value can be obtained and used as a guideline for the area.įor this paper, the flow patterns on twenty wells in the Texas Panhandle area were analyzed. By plotting the Reynolds number and the critical velocity of the drilling fluid verses depth, crossover points should occur on the wells which experienced shale problems. This comparison should be conducted on wells where shale problems occurred and on wells where no problems where encountered. Therefore, by altering the pertinent variables, we can control the Reynolds number of a fluid.įinding the maximum Reynolds number to use as a guideline in a certain area requires a comparison to be done. Keeping the fluid flow in a laminar condition, tends to aid hole cleaning and can minimize shale associated problems. As the fluid properties increase and the fluid becomes more viscous, the critical velocity increases and the Reynolds number decreases which causes the fluid to flow in a more laminar state. By observing the relationship between Reynolds number and the critical velocity of a fluid, it is noticed that they respond inversely as the flow properties of a fluid are changed. ![]()
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