E-CD Device Diverts Mud Flow During Drill Rod Changes
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Solution Overview
Problem
The interruption of fluid circulation in wells during the insertion or removal of drill rods leads to critical issues such as loss of dynamic pressure, potential influx of formation fluids, mechanical blockages, and increased risk of circulation losses, which hinder efficient drilling and can result in unproductive time and safety risks, especially in high-pressure and high-temperature wells or underbalance drilling operations.
Innovation Solution
The E-CD device and E-C Manifold equipment maintain continuous fluid circulation by using a system of radial and axial valves that allow for uninterrupted flow, intercepting and diverting the mud flow during rod changes without affecting the Rig Pump Manifold, ensuring constant pressure and preventing interruptions in drilling operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fluid circulation is interrupted during drill rod insertion or removal, then the drilling operation can be maintained and rod changes can be performed, but dynamic pressure is lost, formation fluids may influx, mechanical blockages can occur, and circulation losses increase
Solution Approach 1:
The system is divided into multiple flow paths: a primary flow path through the drill battery and a secondary flow path through the E-CD device. This segmentation allows independent control of each path, enabling rod changes through the E-CD device while maintaining circulation through the primary path, thus resolving the contradiction between ease of operation and reliability
Solution Approach 2:
The E-CD device acts as an intermediary element that provides an alternative flow path for the drilling fluid. By introducing this mediator, the system can perform rod changes without interrupting the main circulation, maintaining well pressure stability while facilitating operational tasks
2Productivity
If conventional interruption of fluid circulation is used during rod changes, then the rod insertion/removal process can be completed, but ECD diminishes and dynamic pressure is annulled
Solution Approach 1:
The invention ensures continuous fluid circulation through the well by providing an alternative flow path via the E-CD device during rod changes. This maintains the useful action of dynamic pressure generation throughout the process, eliminating the pressure loss that would normally occur during circulation interruption
3Productivity
If circulation is restarted after rod addition using conventional method, then drilling can resume, but troublesome overloads are created on receptive formations or circulation losses in weaker formations
Solution Approach 1:
The system performs preliminary equalization of pressure and flow conditions through the E-CD device before resuming normal circulation. This preliminary action prepares the wellbore for the upcoming high-flow condition, preventing sudden overloads on formations when circulation is restarted
4Speed
If unobstructed rapid falling of drill cuttings occurs in high verticality wells, then cuttings can be transported upward, but mechanical blockage conditions of the drill battery can occur
Solution Approach 1:
The E-CD device serves as an intermediary flow path that accommodates rapid cuttings transport during rod changes. By providing this alternative pathway, the system maintains reliable flow continuity through the drill battery while still enabling fast cuttings removal, resolving the contradiction between speed and reliability
Data Source
AI summary
Equipment for intercepting and diverting liquid circulation flow includes three chambers and a series of valves. The chambers are equipped with a connection device with arrival or supply lines, communicating with each other, of which only a first chamber communicates with second and third chambers. Communication between the first and second chambers and between the first and third chambers each is obtained by at least two valves, one is a flow-rate valve and at least one is an equalizer valve. An upstream or downstream of each equalizer valve is coupled with a fixed or adjustable flow-blocking device. The second and third chambers do not communicate and include a three-way valve in common with each other, or include two one-way valves in counterposition. One one-way valve is open when the other is closed and vice versa, and the three-way valve or the two one-way valves are coupled with a discharge valve.