What are the advantages of T-type drilling?
Advantage 1: Super-short deviation radius
Advantage 2: Layer can be developed by multi branch
Advantage 3: The trajectory of branch can be controlled
We controll the T-shaped hole trajectory in the below three stages.
Window opening stage: the deflector determines the azimuth and angle.
Deviation building stage: the mechanical single bending structure of drilling tools increases rapidly.
Drilling process: interference diameter maintaining bit + stabilizer + pendulum free drilling tool (maxium error 1.5%)
The curvature radius is r, m; the sidehole diameter is D, mm; the length of the flexible unit is l, mm. the geometric relationship between the curvature radius R and the length of the flexible unit L, the bending angle (drilling trend angle) α, and the number of flexible units required in the detecting section is determined by the geometric fixed circle method.
Advantage 4: The trajectory of branch can be measured
The multi-point inclinometer is used to accurately measure the trajectory of the drilling hole.
In each stage of construction, the borehole trajectory parameters should be strictly controlled.
In addition, we judge the hole trajectory through geological logging and cuttings sampling.
Advantage 5: Selectivity of well completion
(1) Bore-hole completion:
(2) Flexible screen completion: sand control and anti-water expansion
(3) Branch and subsection fracturing: flexible tools are put into the open hole and reform the reservoir.
(4) Circulation filling sand control completion:
Advantage 6: Lower working power-workover rig
Land power（workover rig） | Mud pump | ||
Lifting load (t) | Torque (KNm） | Rotation （r/min) | Pump rate （L/min） |
≥80 | ≥30 | 0-120 | ≥900 |
What are the advantages of T-type drilling?
Advantage 1: Super-short deviation radius
Advantage 2: Layer can be developed by multi branch
Advantage 3: The trajectory of branch can be controlled
We controll the T-shaped hole trajectory in the below three stages.
Window opening stage: the deflector determines the azimuth and angle.
Deviation building stage: the mechanical single bending structure of drilling tools increases rapidly.
Drilling process: interference diameter maintaining bit + stabilizer + pendulum free drilling tool (maxium error 1.5%)
The curvature radius is r, m; the sidehole diameter is D, mm; the length of the flexible unit is l, mm. the geometric relationship between the curvature radius R and the length of the flexible unit L, the bending angle (drilling trend angle) α, and the number of flexible units required in the detecting section is determined by the geometric fixed circle method.
Advantage 4: The trajectory of branch can be measured
The multi-point inclinometer is used to accurately measure the trajectory of the drilling hole.
In each stage of construction, the borehole trajectory parameters should be strictly controlled.
In addition, we judge the hole trajectory through geological logging and cuttings sampling.
Advantage 5: Selectivity of well completion
(1) Bore-hole completion:
(2) Flexible screen completion: sand control and anti-water expansion
(3) Branch and subsection fracturing: flexible tools are put into the open hole and reform the reservoir.
(4) Circulation filling sand control completion:
Advantage 6: Lower working power-workover rig
Land power（workover rig） | Mud pump | ||
Lifting load (t) | Torque (KNm） | Rotation （r/min) | Pump rate （L/min） |
≥80 | ≥30 | 0-120 | ≥900 |