Formation testing and sampling tool for stimulation of tight and ultra-tight formations
A fluid sampling tool and method for fluid sampling in an ultra-tight or tight formation. The tool may include a packer assembly that includes one or more inflatable packers and one or more exhaust ports, a multi-chamber section that includes one or more sample chambers, and at least two storage sections that each contain a storage tank, wherein each storage tank holds a stimulation fluid. A method for performing a stimulation operation that includes disposing a fluid sampling tool into a well, moving the fluid sampling tool to a zone of interest, and isolating the zone of interest with a packer assembly on the fluid sampling tool. The method may further include performing a first pressure draw down and a first pressure build up, performing an injectivity test, and performing a sampling process.
1. A method for collecting a fluid sample comprising:
disposing a fluid sampling tool into a well;
moving the fluid sampling tool to a zone of interest;
isolating the zone of interest with a packer assembly on the fluid sampling tool;
injecting a first stimulation fluid through a first exhaust port to contact a face of a formation;
removing a mud disposed between the fluid sampling tool and the face of the formation with a second exhaust port, wherein the first stimulation fluid replaces the mud;
exposing the face of the formation to the first stimulation fluid for a soaking period;
injecting a second stimulation fluid into the formation; and
performing a sampling process.
2. The method of claim 1 , further comprising performing a clean up period in which a fluid from a formation is captured by the fluid sampling tool.
3. The method of claim 2 , further comprising measuring a hydrocarbon contamination level in the fluid.
4. The method of claim 1 , further comprising performing a first pressure draw down, a first pressure build up, a second pressure draw down, and a second pressure build up.
5. The method of claim 4 , further comprising comparing the first pressure draw down and the first pressure build up to the second pressure draw down and the second pressure build up to determine a reservoir enhancement from the stimulation fluid in the zone of interest.
6. The method of claim 1 , wherein the first stimulation fluid etches the face of the formation.
7. The method of claim 1 , wherein the zone of interest is a tight formation or an ultra-tight formation.
8. The method of claim 1 , further comprising monitoring a pressure fall-off response during the soaking time.
9. The method of claim 1 , wherein the stimulation fluid comprises HCL, H2SO4, Alkaline Surfactant Polymers, or viscosity reducers.
10. The method of claim 1 , wherein the stimulation fluid comprises an inhibitor.
11. The method of claim 1 , wherein the packer assembly comprises an inflatable packer.
12. A method for collecting a fluid sample comprising:
disposing a fluid sampling tool into a well;
moving the fluid sampling tool to a zone of interest;
isolating the zone of interest with a packer assembly on the fluid sampling tool;
injecting a first stimulation fluid through a first exhaust port to contact a face of a formation;
removing a mud disposed between the fluid sampling tool and the face of the formation with a second exhaust port, wherein the first stimulation fluid replaces the mud, and wherein an exact volume of mud replaced by stimulation fluid is measured;
exposing the face of the formation to the first stimulation fluid for a soaking period;
injecting a second stimulation fluid into the formation; and
performing a sampling process.
13. The method of claim 12 , further comprising performing a first pressure draw down, a first pressure build up, a second pressure draw down, and a second pressure build up.
14. The method of claim 13 , further comprising comparing the first pressure draw down and the first pressure build up to the second pressure draw down and the second pressure build up to determine a reservoir enhancement from the stimulation fluid in the zone of interest.
15. The method of claim 12 , further comprising performing a clean up period in which a fluid from a formation is captured by the fluid sampling tool.
16. The method of claim 15 , further comprising measuring a hydrocarbon contamination level in the fluid.
17. The method of claim 12 , wherein the first stimulation fluid etches the face of the formation.
18. The method of claim 12 , wherein the stimulation fluid comprises HCL, H2SO4, Alkaline Surfactant Polymers, or viscosity reducers.
19. The method of claim 12 , wherein the stimulation fluid comprises an inhibitor.
20. The method of claim 12 , wherein the packer assembly comprises an inflatable packer.