Wellbore primary barrier and related systems

A wellbore apparatus comprising

• anchor apparatus for anchoring the wellbore apparatus in a bore, the anchor apparatus actuated by fluid under pressure supplied thereto, and
• sealing apparatus selectively inflatable to close off the bore to fluid flow therethrough,
• orienting apparatus for orienting the anchor apparatus to a desired orientation within the bore, and
• wherein the orienting apparatus includes a measurement while drilling device.

A wellbore apparatus comprising

• anchor apparatus for anchoring the wellbore apparatus in a bore, the anchor apparatus actuated by fluid under pressure supplied thereto,
• sealing apparatus selectively inflatable to close off the bore to fluid flow therethrough,
• temperature compensating apparatus for maintaining a desired fluid pressure in the sealing apparatus, and
• orienting apparatus for orienting the anchor apparatus to a desired orientation within the bore, wherein the orienting apparatus includes a measurement while drilling device.

A wellbore apparatus comprising

• anchor apparatus for anchoring the wellbore apparatus in a bore, the anchor apparatus actuated by fluid under pressure supplied thereto,
• sealing apparatus selectively inflatable to close off the bore to fluid flow therethrough,
• temperature compensating apparatus for maintaining a desired fluid pressure in the sealing apparatus, and
• whipstock apparatus connected to the anchor apparatus.

A multi-bore wellbore system comprising

• a main wellbore cased with casing,
• at least one lined lateral wellbore extending from and in fluid communication with the main wellbore,
• at least one of the casing of the main wellbore and the at least one lined lateral wellbore closed off by a primary barrier comprising a wellbore apparatus comprising anchor apparatus for anchoring the wellbore apparatus in a bore, the anchor apparatus actuated by fluid under pressure supplied thereto, and sealing apparatus selectively inflatable to close off the bore to fluid flow therethrough, temperature compensating apparatus for maintaining a desired fluid pressure in the anchor apparatus and in the sealing apparatus, and whipstock apparatus connected to the anchor apparatus, and
• wherein the temperature compensating apparatus comprises a cylinder in which is displaceably positioned a reciprocatingly slidable piston which is movable in response to fluid pressure variations and which has a cavity in fluid communication with a cavity of said cylinder, the piston having a first piston surface which is influenced by the fluid pressure inside the sealing apparatus, and a second piston surface facing a direction opposite the first piston surface which second piston surface is influenced by fluid pressure in the bore, the two piston surfaces having mutually different areas, the temperature compensator arranged to regulate, on the basis of said difference in piston surface area, internal fluid pressure in the sealing apparatus in relating to ambient fluid pressure effective downstream of the sealing apparatus and thus constituting a reference pressure for the internal pressure of the sealing apparatus.