CN206600155U - A kind of Continuous Circulation Drilling System - Google Patents

Abstract

The utility model relates to a continuous circulation drilling system, which is mainly composed of a drill pipe hoisting device, a wellhead device, a drilling fluid flow control device, a drilling tool make-up and breakout device, a hydraulic remote control device, a gate valve and a throttle valve. Including rotating blowout preventer, normal circulation outlet pipe, fully sealed blowout preventer, upper cross, caliper hanger, blowout preventer for well control blowout prevention, lower cross and casing head connected sequentially from top to bottom; The make-up and breakout device of the drilling tool is used in conjunction with the lifting device of the drill pipe; the drilling fluid flow control device is composed of a riser manifold and a high-pressure pipeline interface; the gate valve and the throttle valve are respectively arranged at each nozzle of the wellhead device; The hydraulic remote control device forms a corresponding connection control with hydraulic switches of various blowout preventers, hangers and throttle valves on the wellhead device through hydraulic pipelines. This system realizes the continuous circulation of drilling fluid, which improves the success rate and safety of drilling operations in complex formations.

Description

A continuous circulation drilling system

technical field

The utility model relates to a continuous cycle drilling system for wells with complex structures in the technical fields of petroleum and natural gas drilling, geological exploration, mine drilling and water well drilling.

Background technique

Oil drilling occupies an important position in the oil industry. With the development of oil and gas well technology, the application of new drilling technology has enabled the drilling of complex structural wells such as ultra-deep wells, extended-reach wells, and long horizontal sections. However, during conventional drilling operations, when connecting a single pipe, it is necessary to stop the drilling fluid circulation in the well first, and then start the pump to resume circulation after connecting a new single pipe. In this way, due to the stop and recovery of the drilling fluid circulation before and after the single connection, the pressure in the annular space fluctuates greatly, which often leads to a series of downhole problems such as cuttings sinking, well wall collapse, stuck pump, overflow and lost circulation. In unstable formations, narrow density windows, long horizontal sections, large displacement, and deep well drilling, such downhole complex situations and accidents caused by downhole pressure fluctuations caused by starting and stopping pumps are particularly prominent.

At present, continuous circulation drilling at home and abroad adopts two methods: continuous circulation system (CCS) and continuous circulation valve. The former has a large structure and combination volume and stands on the drilling floor; the development cost is high, and the research and use are limited. The latter has a large number of continuous circulation valves, a large number of connecting threads, and a large number of sealing parts, which increases the risk of unsafety; when the pressure of the circulation valve increases, the confining pressure acting on the valve seat will increase, resulting in the circulation valve not being able to rotate. Therefore, a new continuous circulation drilling system is needed, which can better ensure the continuous circulation of drilling fluid during drilling.

Utility model content

In view of the above problems, the utility model proposes a continuous circulation drilling system. The system uses triple blowout preventers and bypass pipelines to form a wellhead device and a drilling fluid flow control device. The hydraulic remote control device controls the switch of the blowout preventer in the wellhead device and the channel conversion in the drilling fluid flow control device to realize the drilling fluid in the wellhead. The pump can be kept in a continuous circulation state during the connection of a single root.

The technical scheme of the utility model is:

A continuous circulation drilling system is mainly composed of a drill pipe hoisting device, a wellhead device, a drilling fluid flow control device, a drilling tool make-up and breakout device, a hydraulic remote control device, a gate valve, and a throttle valve, wherein: the wellhead device includes an automatic Rotary blowout preventer, normal circulation outlet pipe, fully sealed blowout preventer, upper cross, caliper hanger, well control blowout preventer, lower cross and casing head, lower cross connected sequentially from top to bottom A choke manifold is provided; the breakout device of the drilling tool is used in conjunction with the lifting device of the drill pipe; the drilling fluid flow control device is composed of a riser manifold and a high-pressure pipeline interface, and circulates with the high-pressure side of the upper cross Manifold connection; the gate valves and choke valves are respectively arranged at the nozzles of the wellhead device; The switch constitutes a corresponding connection control.

The above programs further include:

An inverted semi-seal blowout preventer is also provided between the caliper hanger and the blowout preventer for well control blowout preventer.

The make-up and break-out device of the drilling tool adopts a set of single-acting hydraulic tongs.

Based on the characteristics of strong practical feasibility, this utility model adopts triple blowout preventers and bypass pipelines to form a wellhead device and a drilling fluid flow control device, and controls the switch of the blowout preventer in the wellhead device and the drilling fluid flow direction control through a hydraulic remote control device The flow direction in the device is switched to realize the continuous circulation of drilling fluid. It can ensure the continuous circulation of drilling fluid during the process of connecting a single root, effectively solving many downhole safety problems caused by the interruption of drilling fluid circulation. This provides a strong technical support for drilling complex wells such as unstable wells, narrow density window wells, long horizontal section wells, extended reach wells and deep wells. It can effectively overcome downhole pressure fluctuations caused by stopping and starting pumps, and reduce downhole complex situations and accidents caused by pressure fluctuations.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a continuous circulation drilling system.

Fig. 2 is a combined schematic diagram of a wellhead device and a drilling fluid flow direction control device in another continuous circulation drilling system.

1. Wellhead device, 2. Drilling fluid flow control device, 3. Drilling tool make-up and breakout device, 4. Hydraulic remote control device, 5. Drill string, 6. Rotary blowout preventer, 7. Full seal blowout preventer, 8 .Upper cross, 9. Caliper hanger, 10. Semi-sealed blowout preventer, 11. Blowout preventer for well control blowout prevention, 12. Lower cross, 13. Normal circulation outlet pipe, 14. Standpipe manifold, 15. High pressure side circulation manifold, 16. High pressure pipeline, 17. Throttle manifold, 18. Casing head.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described.

Embodiment 1: Referring to accompanying drawing 1, a continuous circulation drilling system mainly consists of a drill pipe hoisting device (not shown in the figure), a wellhead device 1, a drilling fluid flow control device 2, a drilling tool make-up and breakout device 3, a hydraulic The remote control device 4 is composed of a gate valve and a throttle valve. Wherein: the wellhead device 1 includes a rotating blowout preventer 6 connected sequentially from top to bottom, a normal circulation outlet pipe 13, a fully sealed blowout preventer 7, an upper cross 8, a caliper hanger 9, and a blowout preventer for well control. Injector 11, lower cross 12 and casing head 18, lower cross 12 is provided with throttling manifold 17. The make-up and breakout device 3 of the drilling tool is used in conjunction with the drilling pipe lifting device. The drilling fluid flow direction control device 2 is composed of a standpipe manifold 14 and a high-pressure pipeline 16 interface, and is connected to the high-pressure side circulation manifold 15 of the upper cross 8 . The gate valve and the throttle valve are respectively arranged at each nozzle of the wellhead device. The hydraulic remote control device forms a corresponding connection control with hydraulic switches of various blowout preventers, hangers and throttle valves on the wellhead device through hydraulic pipelines.

Embodiment 2: Referring to accompanying drawings 1 and 2, on the basis of the above embodiment 1, an inverted semi-sealed blowout preventer 10 is also provided between the caliper hanger 9 and the blowout preventer 11 for well control blowout prevention.

Further, the breakout device of the drilling tool adopts a set of single-acting hydraulic tongs.

Normal positive circulation during normal drilling, when a single root needs to be connected after drilling, at this time

(1) Lift the drilling tool 5 above the caliper hanger 9 and reduce the circulation displacement;

(2) Then open the throttling circulation manifold 17;

(3) Close the suspension ram in the caliper hanger 9 and hang the drilling tool;

(4) Close the inverted semi-sealed blowout preventer 10;

(5) Close the rotary blowout preventer 6;

(6) Close the normal circulation outlet 13;

(7) Open the circulation manifold 15 on the high pressure side;

(8) Close the caliper in the caliper hanger 9;

(9) Use the screw-on and break-out device 3 to remove the drill tool 5 (connect the screw thread between the caliper hanger 9 and the fully sealed blowout preventer 7) and lift it up about 0.20m;

(10) Close the positive circulation path of riser manifold 14;

(11) Lift the drilling tool 5 until its joints are all above the fully sealed blowout preventer 7 (under the rotating blowout preventer 6);

(12) Close the fully sealed blowout preventer 7;

(13) Open the normal circulation outlet pipe 13;

(14) Open the rotary blowout preventer 6;

(15) Pull out the drilling tool 5 and connect the new single piece of drill pipe;

(16) Put the newly connected single root into the wellhead until its joint passes through the rotating blowout preventer 6 and is located on the fully sealed blowout preventer 7;

(17) Close the rotary blowout preventer 6;

(18) Open the positive circulation path of riser manifold 14;

(19) Open the fully sealed blowout preventer 7;

(20) The lowering drilling tool is hooked up with the drilling tool in the well and connected and fastened with the make-up and breakout device 3 or the top drive device;

(21) Close the circulation manifold 15 on the high pressure side;

(22) Open the inverted semi-sealed blowout preventer 10;

(23) Loosen the caliper, lift up the drilling tool and open the hanger 9;

(24) Open the normal circulation outlet pipe 13;

(25) Open the rotary blowout preventer 6;

(26) Close the choke manifold 17, increase the displacement and resume drilling.

The advantages of using the above continuous circulation drilling system for drilling are:

1. It eliminates the pressure fluctuation caused by stopping and starting the pump in conventional drilling operations, and can effectively avoid downhole accidents caused by well wall instability and cuttings settlement.

2. The application of the continuous circulation drilling system can establish a stable annular pressure gradient in the entire open hole section, avoiding the occurrence of lost circulation and well kick accidents.

3. The continuous circulation drilling system adopts the ground blowout preventer group, which is simple in structure, easy to install, does not occupy the space of the drill floor, and is controlled remotely, which is safe, reliable, efficient and convenient for operators to operate.

4. The continuous circulation drilling system mostly utilizes existing blowout preventers, spools, pipelines, gate valves and remote control devices, which reduces the research and development of new devices.

Claims (3)

1. a kind of Continuous Circulation Drilling System, mainly by drilling rod hanging apparatus, wellhead assembly, drilling fluid flow control apparatus, brill Shackle device, hydraulic lohg-rang control device and gate valve, choke valve composition on tool, it is characterised in that：The wellhead assembly is included certainly It is upper and under be sequentially connected rotating blowout preventer, normal circulation outlet, envelope preventer, upper four-way, clamp hanger, well control are prevented entirely Spray preventer, lower four-way and casing head, lower four-way are provided with choke manifold；Shackle device and drilling rod hanging apparatus on the drilling tool Support the use；The drilling fluid flow control apparatus is made up of standpipe manifold and high pressure line interface, and with the high pressure of upper four-way Side circulation manifold connection；The gate valve and choke valve are separately positioned on each mouth of pipe of wellhead assembly；The hydraulic remote control Device connects by the way that fluid pressure line is corresponding with the hydraulic selector composition of various preventers, hanger and choke valve on wellhead assembly respectively Connect control.

2. a kind of Continuous Circulation Drilling System as claimed in claim 1, it is characterised in that：In clamp hanger and well-control blowout prevention Half envelope preventer is inverted with being additionally provided between preventer.

3. a kind of Continuous Circulation Drilling System as claimed in claim 1 or 2, it is characterised in that：Spiral-lock is unloaded on described drilling tool It is a set of single-acting hydraulic tong to put.