Controllable downhole directional drilling tool and method
First Claim
1. A tool for controllable, directional drilling in a deep bore well comprising:
- a. an elongate, outer, orientable casing member, aligned in said bore;
b. an inner, bendable, torque passing member adapted for rotation of a drill bit, journaled within said outer casing member;
c. means for deflecting, with respect to the orientation of the outer casing member, the inner bendable torque passing member; and
d. means having a first coupled position, coupling the outer casing member and said inner bendable member, and a second uncoupled position disconnecting the outer casing member and the inner bendable member.
2 Assignments
0 Petitions
Accused Products
Abstract
An improved directional drilling tool permits the control of the angle of drilling of a drill bit through the repeated placement or removal of a ball within the mudstream. The ball activates, clutch mechanism within the directional drilling tool. The clutch mechanism, controlled by the activated valve, locks the exterior of the directional drilling sub to a fixed angular orientation and activates a deflection cam to deflect a drive shaft so as to angle the bit, causing the bit and sub to drill at a controlled angle offset from the vertical. The unit is aligned and located using wire line measuring equipment of known design. Since the sub may be controllably set in a straight line drilling or an angle drilling position, it may be left permanently in position in a drill string significantly reducing the requirement to trip out the well bore during directional drilling and significantly increasing the flexibility available to the driller to deflect the direction of drilling while drilling is in progress.
61 Citations
9 Claims
-
1. A tool for controllable, directional drilling in a deep bore well comprising:
-
a. an elongate, outer, orientable casing member, aligned in said bore; b. an inner, bendable, torque passing member adapted for rotation of a drill bit, journaled within said outer casing member; c. means for deflecting, with respect to the orientation of the outer casing member, the inner bendable torque passing member; and d. means having a first coupled position, coupling the outer casing member and said inner bendable member, and a second uncoupled position disconnecting the outer casing member and the inner bendable member. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus for removably coupling an outer casing member in an inner rotating member within a drilling tool, retaining relative alignment for engaged use, comprising:
-
a. clutch means, engaging and disengaging the outer casing member and the inner rotating member; b. controllable means for actuating the clutch means, the controllable means further comprising; i. first bypass passages connecting a first mud flow path and a second mud flow path; b. actuatable mud flow restriction means, forcing, upon actuation, mud through the first bypass passages into the second mud flow path; c. a surface component position in the second mud flow path movable in response to the mud flow within the second mud flow path; and e. means for biasing the movable surface member to a first position and second bypass passages for returning mud to the first mud flow path upon movement of the surface component to a second position.
-
-
9. A method for directional drilling comprising:
-
a. providing an outer, rotationally alignable, bore contacting alignment means; b. providing an inner deflectable drive means having a first straight line and a second curve driving position; c. providing means for rotationally coupling and uncoupling the outer, rotationally alignable bore contacting alignment means and inner deflectable drive means; d. rotatably connecting a drill bit to said deflectable drive means, angularly responsive to said deflection; e. aligning said outer means to establish an azmuth of said drilling direction; and f. deflecting said drive means to establish an offset drill arc angle along said azmuth.
-
Specification