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A tool string for use in a well includes a filter sub (or trapped pressure regulator sub) that is used with other components to reduce trapped pressure. The filter sub filters out debris that may occur from various types of downhole operations, such as perforating operations. By filtering out larger

A tool string for use in a well includes a filter sub (or trapped pressure regulator sub) that is used with other components to reduce trapped pressure. The filter sub filters out debris that may occur from various types of downhole operations, such as perforating operations. By filtering out larger debris, only gases, liquids, and smaller particles are allowed to enter various components of the tool string. Without the presence of larger solid debris inside certain components of the tool string, the likelihood of plugs being formed is reduced so that gases and liquids can more readily pass out of the tool string as the tool string is retrieved to the surface of the well and the well hydrostatic pressure decreases.

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A tool string for use in a well includes a filter sub (or trapped pressure regulator sub) that is used with other components to reduce trapped pressure. The filter sub filters out debris that may occur from various types of downhole operations, such as perforating operations. By filtering out larger

A tool string for use in a well includes a filter sub (or trapped pressure regulator sub) that is used with other components to reduce trapped pressure. The filter sub filters out debris that may occur from various types of downhole operations, such as perforating operations. By filtering out larger debris, only gases, liquids, and smaller particles are allowed to enter various components of the tool string. Without the presence of larger solid debris inside certain components of the tool string, the likelihood of plugs being formed is reduced so that gases and liquids can more readily pass out of the tool string as the tool string is retrieved to the surface of the well and the well hydrostatic pressure decreases. fficiently exceeds said ambient pressure side thereby compressing said pack off rubber between said piston and said pack off bushing such that compression of said pack off rubber compresses said pack off rubber axial passage around the data transmitting wireline to provide a pressure seal between said pack off rubber axial passage and the data transmitting wireline passing therethrough. 3. The pressure pack off head of claim 1 further comprising a rubber compressor axially disposed in said pressure pack off head between said piston and said pack off rubber for translating axial force from said piston to said pack off rubber. 4. A well pressure activated pack off head for use in conjunction with a wellhead situated on a hydrocarbon producing wellbore comprising: a hollow body formed for coaxial connection to the wellhead and for providing unobstructed passage of a data transmitting wireline therethrough; a pack off rubber having an axial passage therein formed for passage of a data transmitting wireline therethrough, said pack off rubber is coaxially situated within said hollow body; a pack off bushing having an axial passage therein formed for passage of a data transmitting wireline therethrough, said pack off bushing is coaxially situated within said hollow body; a piston coaxially situated within said hollow body and having an axial passage therein formed for passage of a data transmitting wireline therethrough, said piston having a wellbore pressure side and an ambient pressure side, said wellbore pressure side in pressure communication with said wellbore, said ambient pressure side is in pressure communication with the ambient space surrounding said pressure pack off head; wherein said pack off rubber is located between said pack off bushing and said piston; and a dampening system comprising a pressure port that controls the rate of force applied to said pack off rubber by said piston.