Drilling hydraulics program12/21/2023 ![]() The concept is suited for drilling with a liner, which optionally can be expanded in place in the same run. A sliding piston in the annular downhole section of the well, is used for force and pressure control. The patented concept is based on the use of a dual channel drill string, where one of the channels is used for the return flow from the well. Therefore, this method can afford an effective approach to improve ROP in deep well.Ībstract The feasibility of a new concept for drilling and lining of a well has been investigated. Through the application of the proposed method, the results show that the ROP in deep and ultra-deep well has been improved obviously, and which have decreased the cost of drilling operation greatly. The results show that the ROP of these wells were improved about 10.5%~80%. Based on the novel and systematic method, the optimal drill assembly, flow rate, pump pressure, nozzle combination and others drilling parameters were all obtained. ![]() The technology has been applied in several wells in Tarim basin of China and the test formations are about 3535m-6935m depth. Moreover, for maximizing the ROP, the size of drill pipe size was considered during the process of hydraulics optimization. For improving the design precision, the flow channel both in pipe and annuli was divided into several sections and the flow regime change of each section was considered. Second, according to the problem that no single rheology model can describe exactly the rheological properties of all types drilling fluids, a systemic hydraulic optimization approach was established, which is applicable for all common rheological models. In order to eliminate the influence caused by the difference of the other drilling data, all of them were normalized in this process. It can conduct the integrated hydraulics design to improve ROP not only during making the drilling design, but also can generate recommendations of hydraulic optimization for improving ROP in the process of drilling based on the real-time drilling situation.įirst, this paper presents a mathematical analysis of the hydraulics (Bit pressure drop, bit specific hydraulic horsepower, et al.) influence on the ROP based on the drilling engineering data of several wells of Tarim basin in west China. A comprehensive procedure of optimization hydraulic design for improving ROP was formulated. Guidelines for the identification, prevention, and remediation of hole cleaning problems are also included.Abstract With the oil and gas exploration and development in deep formation and the number of deep wells grow continually, the ROP decreases greatly and the cost of drilling operation increases rapidly. Included are the design equations for weighting material transport, and cuttings transport in both high and low angle wells. The hydraulics program is named HYDRAUL and the hole cleaning program is called the Solids Transport Efficiency Program, or STEP.ĭocumentation on HYDRAUL is given in the Appendix A as the "Hydraulics Technical Reference Manual" and includes sections on YPL rheology, fundamental equations for laminar and turbulent flow in arbitrary wellbore geometries, hydraulic calculations of downhole tools, system pressure losses, jet nozzle selection, and vertical cuttings transport.ĭocumentation for the design equations in STEP are also given in Appendix B. A PC having a 80386 or higher processor with at least 4 Meg RAM is required. These design programs have been written as EXCEL spreadsheet programs and can be run under windows using EXCEL Version 4. Extrapolation of (t = ty) to g = 1 sec-1 gives K.Īmoco presently formulates its hydraulics and hole cleaning design programs based on the YPL model. Ty may be estimated by extrapolating the 6-rpm and 3-rpm Fann readings to zero or, if these are not available, using the 10-sec gel strength. Amoco Research has determined that the yield- power law model is the preferred way to characterize drilling- fluid rheology because it is a more general model that includes both Bingham Plastic and Power Law behaviors.
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