Seal for a wellbore having a wall, wherein a fluid rises in the wellbore, having: a) a pipe, which can be introduced into the wellbore; b) at least one apron composed of a fluid-tight material, b1) wherein the at least one apron is fixed to the pipe in a fluid-tight manner; b2) wherein the at least one apron is able to assume a state in which it is folded towards the pipe and a state in which it is unfolded away from the pipe towards the wall; b3) wherein the pipe and the at least one apron are implemented in such a way that, when the at least one apron is in the state in which it is folded towards the pipe, there is a gap between the at least one apron and the wall when the pipe is introduced into the wellbore; b4) wherein the at least one apron comprises at least one fixing element; b5) wherein the hardness of the at least one fixing element exceeds the hardness of the wall; b6) such that the at least one fixing element can penetrate the wall when the at least one apron is pressed against the wall; b7) such that a positive-locking connection can be achieved between the at least one apron and the wall; and having c) means that can be activated, c1) wherein an activation of the means that can be activated results in the at least one apron being able to assume the state in which it is unfolded away from the pipe and towards the wall. a) a pipe, which can be introduced into the wellbore; b) at least one apron composed of a fluid-tight material, b1) wherein the at least one apron is fixed to the pipe in a fluid-tight manner; b2) wherein the at least one apron is able to assume a state in which it is folded towards the pipe and a state in which it is unfolded away from the pipe towards the wall; b3) wherein the pipe and the at least one apron are implemented in such a way that, when the at least one apron is in the state in which it is folded towards the pipe, there is a gap between the at least one apron and the wall when the pipe is introduced into the wellbore; b4) wherein the at least one apron comprises at least one fixing element; b5) wherein the hardness of the at least one fixing element exceeds the hardness of the wall; b6) such that the at least one fixing element can penetrate the wall when the at least one apron is pressed against the wall; b7) such that a positive-locking connection can be achieved between the at least one apron and the wall; and having b1) wherein the at least one apron is fixed to the pipe in a fluid-tight manner; b2) wherein the at least one apron is able to assume a state in which it is folded towards the pipe and a state in which it is unfolded away from the pipe towards the wall; b3) wherein the pipe and the at least one apron are implemented in such a way that, when the at least one apron is in the state in which it is folded towards the pipe, there is a gap between the at least one apron and the wall when the pipe is introduced into the wellbore; b4) wherein the at least one apron comprises at least one fixing element; b5) wherein the hardness of the at least one fixing element exceeds the hardness of the wall; b6) such that the at least one fixing element can penetrate the wall when the at least one apron is pressed against the wall; b7) such that a positive-locking connection can be achieved between the at least one apron and the wall; and having c) means that can be activated, c1) wherein an activation of the means that can be activated results in the at least one apron being able to assume the state in which it is unfolded away from the pipe and towards the wall. c1) wherein an activation of the means that can be activated results in the at least one apron being able to assume the state in which it is unfolded away from the pipe and towards the wall.