Method of pressure testing a plugged well
A method of plugging a well extending into a hydrocarbon bearing formation facilitates temporary or permanent abandonment of the well. The method includes forming two or more plugs within the well, the plugs being formed at longitudinally spaced apart locations whilst providing a fluid communication path from a region above the topmost plug to the or each space between adjacent plugs. This configuration facilitates pressure testing of one or more of the plugs by conducting fluid through said path.
1. A method of plugging a well extending into a hydrocarbon bearing formation to facilitate temporary or permanent abandonment of the well, the method comprising the step of:
pumping a sealant into the well to form two or more plugs within the well, the plugs being formed at longitudinally spaced apart locations while providing a fluid communication path from a region above a topmost plug of said two or more plugs to at least one space between adjacent plugs of said two or more plugs; and
pressure testing of one or more of said two or more plugs by conducting fluid through said fluid communication path.
2. The method according to claim 1 , wherein each plug has a length of at least 0.2 meters.
3. The method according to claim 1 , further comprising the step of partially or completely filling said at least one space with a permeable material or void making material or device.
4. The method according to claim 3 , wherein said permeable material is a particulate material.
5. The method according to claim 4 , wherein said particulate material is one of sand or proppant.
6. The method according to claim 1 , wherein said step of providing the fluid communication path comprises positioning one or more pressure testing tubes within plugs of said two or more plugs located directly above said at least one space.
7. The method according to claim 1 , further comprising the step of pressure testing of one or more of the plugs by conducting fluid through said fluid communication path.
8. The method according to claim 7 , further comprising the step of plugging the fluid communication path subsequent to said pressure testing.
9. A method of pressure testing a plug formed during plugging of a well using the method of claim 1 , the method comprising the steps of:
passing a fluid through said fluid communication path in order to establish an elevated or reduced pressure within said at least one space; and
monitoring the pressure or leakage at at least one of the following locations to determine the integrity of at least one of said two or more plugs: between said adjacent plugs and above or below one or more of the plugs.