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Underbalance drilling equipment

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• UBD is defined as drilling operations where the drilling fluid pressure in the borehole is less than the pore pressure in the formation rocks.

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Underbalance drilling equipment

  1. 1. Hawler Petroleum Institute Drilling Department Drilling Services Underbalanced Drilling Equipment Prepared by : Shivan A.Sabir Second Stage Group : D
  2. 2. Underbalanced Drilling Services Definition :- • UBD is defined as drilling operations where the drilling fluid pressure in the borehole is less than the pore pressure in the formation rocks. • During underbalanced operations,specific techniques and equipmentare used for handling and controlling the formation fluids influx to the wellbore and lifting up to the surface. AIM OF UBD :-  To minimize drilling problems.  To optimize hydrocarbons recovery
  3. 3. Advantages of UBD :- 1. Reduce formation damage / increase productivity. 2. Minimize loss of circulation. 3. Increase ROP. 4. Eliminate pipe differential sticking. 5. Improve formation evaluation. 6. Reduce stimulation requirements. 7. Prolong bit life. Disadvantages of UBD :- 1. Expense. 2. Safety Concern. 3. Wellbore Instability. 4. Sever Formation Damage.
  4. 4. Underbalanced Drilling Equipment: Have Two Typeof UBD Equipment:- 1. Key Tools . 2. Other Tools. 1. Key Tools :- 1.Rotating Control Head . 2.Chokes . 3.Non Return Valve. 2.Other Tools:- 1. Downhole Deployment Valve. 2. ECD Reduction Tool. 3. Coriolis Flow Meter . 4. Downhole Air Diverter. 5. Nitrogen Generation Unit . 6. Multiphase Separation System. 7. Real-time Pressure and Flowrate Monitoring . 8. Continuous Circulation Valve.
  5. 5. Rotating Control Head :- Rotating control head technology has become an important tool for lowering drilling costs and increasing well productivity, especially in many hard-rock areas and mature oil and gas fields. Lower drilling costs are achieved primarily by the faster penetration rates, reduced nondrilling time, and reduced mud volume requirements associated with underbalanced drilling. Greater well productivity can sometimes be obtained because of reduced formation damage from mud. Recent advances in rotating head technology have increased the range of well conditions to which this technology can be applied. In addition, rotating control heads are being used for enhanced safety and environmental protection in areas where underbalanced drilling is not currently feasible. Approximately one-fourth of the rigs working in the U.S. and Canada today use a rotating control head at some point during the drilling program. Chokes :- A device incorporating an orifice that is used to control fluid flow rate or downstream system pressure. Chokes are available in several configurations for both fixed and adjustable modes of operation. Adjustable chokes enable the fluid flow and pressure parameters to be changed to suit process or production requirements. Fixed chokes do not provide this flexibility, although they are more resistant to erosion under prolonged operation or production of abrasive fluids
  6. 6. Non Return Valve:- A non-return valve allows a medium to flow in only one direction. A non-return valve is fitted to ensure that a medium flows through a pipe in the right direction, where pressure conditions may otherwise cause reversed flow. A non-return valve can be fitted to ensure that a medium flows through a pipe in the right direction, where pressure conditions may otherwise cause reversed flow. A non-return valve allows a medium to flow in only one direction. The flow through the non-return valve causes a relatively large pressure drop, which has to be taken into account when designing the system. There are different types of non-return valves, such as spring-loaded, swing type, and clapper type valves. Non-return valves are e.g. used with mixing loops in heating and cooling systems to ensure proper operation, and with domestic water systems to prevent backflow. Downhole Deployment Valve:- Underbalanced drilling is a specialized drilling technique in which the bottom hole pressure exerted by the hydrostatic head of the wellbore fluid column is less than the pressure of the formation being drilled. The downhole deployment valve (DDV) allowed rig personnel to trip the drillstring out of the well twice, during and following underbalanced drilling operations for the horizontal laterals, without pumping kill fluids to control 3,400-psi reservoir pressure.
  7. 7. ECD Reduction Tool:- High equivalent circulation density (ECD) is responsible for many wellbore pressure-related problems during drilling. Proper wellbore pressure management is a critical part of normal drilling practices, where static and dynamic fluid pressures are used to contain formation pressures and assure wellbore stability. Excessive fluid pressure while circulating can create problems including reduced operating margins between fracture and pore pressures and, in the extreme, lost circulation. To address these problems, an ECD Reduction Tool (ECD RT) is being developed. The ECD RT is designed to counter downhole pressure increase due to friction in the annulus by reducing the hydrostatic head. The tool is expected to have a broad range of drilling applications including the narrow pore/fracture pressure margin in the deepwater environment, wellbores prone to instability, pressure depleted reservoirs and extended reach wells. The ECD RT will also potentially reduce the impact of uncertainty when selecting casing setting depth by widening the usable margin between pore pressure and fracture gradient. Downhole Air Diverter:- A down hole air diverter having a first opening in communication with the central passageway of a drillstring; a second opening in communication with the well bore annulus; and a means to control the flow of pneumatic fluid between the first opening and the second opening. The means to control the flow further includes a first sealing means and a first biasing means to control the first sealing means. The first sealing means allows communication with the well bore annulus when the well bore annulus pressure exceeds the first biasing means pressure and prevents communication when the bias pressure exceeds the bore annulus pressure. A second sealing means prevents communication with the drillstring when the pressure from the second sealing means chamber exceeds the first opening pressure and allowing communication when the first opening pressure exceeds the chamber pressure.
  8. 8. Nitrogen Generation Units:- Maximize protection and production of mature reservoirs M-I SWACO nitrogen generation units offer nitrogen gas generation and injection at selectable flow rates to assure purity for multiphase managed pressure and underbalanced drilling applications. Mobile nitrogen generation unit Mobile nitrogen generation units (MNGUs) are mounted on a single trailer, with full interconnection and calibration, complete with inlet and outlet metering. They are specifically designed for rapid deployment to remote locations. MNGUs minimize transport, rig-up and removal time, and environmental footprint, while maximizing efficiency and maintenance. The MNGU is the optimal, cost-effective choice for remote locations because it facilitates nitrogen logistics, provides continuous mobility, and produces nitrogen at high purities. Skid nitrogen generation unit Skid nitrogen generation units (SNGUs) are mounted in protective ISO containers for easy, reliable handling and stacking. The SNGU includes diesel or electrically powered motors, a membrane nitrogen generation system, three compressors, and a booster. The electrically driven SNGU is efficiently quiet, using a generator driven by one engine that requires less maintenance and has a smaller carbon footprint in terms of exhaust, engine oil, and coolant. It can be modified for use on offshore applications. Multiphase separation system The current disclosure relates to multiphase fluid separation via a multiphase separation system. The multiphase separation system is configured to feed a multiphase fluid into feed lines within the multiphase separation system, wherein the feed lines consist of an upper line, a middle line, and a lower line. The upper line is configured to flow a first stream substantially including oil into an oil section of a control volume. The middle line is configured to flow a second stream substantially including an oil/water emulsion into an oil/water emulsion section of the control volume. The lower line is configured to flow a third stream substantially including water into a water section of the control volume. The control volume is configured to adjust fluid flow rate at an outlet, wherein the oil section, the water section, and the oil/water emulsion section each commingle at different heights of the control volume.
  • YoussefShabaan1

    Oct. 24, 2020
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    Feb. 10, 2020
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    Jan. 23, 2018

• UBD is defined as drilling operations where the drilling fluid pressure in the borehole is less than the pore pressure in the formation rocks.

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