Wellbore pipe protection device for protecting, in a condition mounted to a wellbore pipe end (7; 107), the screw thread (8; 108) of the pipe end, wherein the protection device (1; 101) in the mounted condition is manually operable to interchange its condition between: - a locked condition in which the protection device is fixed to the pipe in a manner so as to prevent the protection device from becoming detached from the pipe due to certain accidental external impacts, and - an unlocked condition in which the protection device is fixed to the pipe less firmly than in the locked condition and in which the protection device is manually removable from the pipe; and wherein the protection device comprises: - a covering sleeve (2; 102) comprising a peripheral sleeve wall (21; 121), wherein one side of the sleeve wall is a covering side (22; 122) for covering, in the mounted condition, the screw thread of the pipe end, and wherein the covering sleeve is provided on the covering side of the sleeve wall with elastic material (4; 104), and wherein at least part of the sleeve wall is flexible while the sleeve wall is interrupted by slits (23; 123) whose length directions extend at least in axial direction (5; 105) of the sleeve, such that the sleeve wall is deformable in such way that at least the diameter of the sleeve wall is, in at least a subrange in axial direction of the sleeve, adjustable, which adjustability enables the said interchangeability between the locked condition and the unlocked condition in that the elastic material in the locked condition is being pressed by the sleeve wall into the screw thread, while in the unlocked condition it is not, or less firmly than in the locked condition, being pressed into the screw thread; and - an actuating element (3; 103) being slidable, relative to the covering sleeve, at least with a component in the axial direction (5; 105) of the covering sleeve for realizing changes in the deformation state of the sleeve wall in order to realise the said interchangeability between the locked condition and the unlocked condition; characterized in that the actuating element (3; 103) comprises a handgrip (9; 109) which, relative to the covering sleeve (2; 102), is manually slidable at least with a component in said axial direction (5; 105) for realizing said slidability of the actuating element, and which, in the locked condition, relative to the covering sleeve, is manually rotatable about said axial direction into a rotation position in which said slidability of the actuating element is blocked at least in a direction towards the unlocked condition. - a locked condition in which the protection device is fixed to the pipe in a manner so as to prevent the protection device from becoming detached from the pipe due to certain accidental external impacts, and - an unlocked condition in which the protection device is fixed to the pipe less firmly than in the locked condition and in which the protection device is manually removable from the pipe; - a covering sleeve (2; 102) comprising a peripheral sleeve wall (21; 121), wherein one side of the sleeve wall is a covering side (22; 122) for covering, in the mounted condition, the screw thread of the pipe end, and wherein the covering sleeve is provided on the covering side of the sleeve wall with elastic material (4; 104), and wherein at least part of the sleeve wall is flexible while the sleeve wall is interrupted by slits (23; 123) whose length directions extend at least in axial direction (5; 105) of the sleeve, such that the sleeve wall is deformable in such way that at least the diameter of the sleeve wall is, in at least a subrange in axial direction of the sleeve, adjustable, which adjustability enables the said interchangeability between the locked condition and the unlocked condition in that the elastic material in the locked condition is being pressed by the sleeve wall into the screw thread, while in the unlocked condition it is not, or less firmly than in the locked condition, being pressed into the screw thread; and - an actuating element (3; 103) being slidable, relative to the covering sleeve, at least with a component in the axial direction (5; 105) of the covering sleeve for realizing changes in the deformation state of the sleeve wall in order to realise the said interchangeability between the locked condition and the unlocked condition;