Methods for freeing differentially stuck pipes
Methods for freeing differentially stuck pipes may comprise introducing a spotting fluid composition in the vicinity of a portion of a differentially stuck pipe in a well, such that the spotting fluid contacts a material surrounding the portion of the differentially stuck pipe. The spotting fluid may comprise about 0.01 M to about 5 M of an oxidative agent comprising a metal ferrate(VI) and an aqueous solution.
1 . A method comprising:
introducing a spotting fluid composition in the vicinity of a portion of a differentially stuck pipe in a well, such that the spotting fluid contacts a material surrounding the portion of the differentially stuck pipe, the spotting fluid composition comprising:
about 0.01 M to about 5 M of an oxidative agent comprising a metal ferrate(VI); and
an aqueous alkaline solution.
2 . The method of claim 1 , wherein the metal ferrate(VI) comprises potassium ferrate, sodium ferrate, or a combination thereof.
3 . The method of claim 1 , wherein a pH of the spotting fluid composition is about 4 to about 11.
4 . The method of claim 1 , wherein the aqueous alkaline solution comprises potassium hydroxide.
5 . The method of claim 1 , wherein the spotting fluid composition is able to withstand a temperature of about 70° F. to about 250° F.
6 . The method of claim 1 , wherein a downhole pressure of the well is about 50 psi to about 1,500 psi.
7 . The method of claim 1 , further comprising allowing the spotting fluid composition to interact with the material surrounding the portion of the differentially stuck pipe over a period of time.
8 . The method of claim 7 , wherein after the period of time, the spotting fluid composition contributes to a degradation of the material surrounding the portion of differentially stuck pipe.
9 . The method of claim 1 , wherein the material comprises a filter cake, the filter cake comprising a drilling mud.
10 . The method of claim 9 , wherein the drilling mud comprises a water-based mud, a brine-based mud, or a combination thereof.
11 . The method of claim 9 , wherein the drilling mud comprises a swellable clay, a polymer viscosifier, a weighting material, a chemical additive, a pH modifier, or any combination thereof.
12 . The method of claim 11 , wherein the polymer viscosifier comprises a natural polymer, a synthetic polymer, or a combination thereof.
13 . The method of claim 12 , wherein the polymer viscosifier comprises a natural polymer, and the natural polymer comprises xanthan gum, starch, or a combination thereof.
14 . The method of claim 12 , wherein the polymer viscosifier comprises a synthetic polymer, and the synthetic polymer comprises an acrylamide-based polymer.
15 . A method comprising:
introducing a spotting fluid composition in the vicinity of a portion of a differentially stuck pipe in a well having a downhole pressure of about 50 psi to about 1,500 psi, such that the spotting fluid contacts a filter cake surrounding the portion of the differentially stuck pipe, the spotting fluid composition comprising:
about 0.01 M to about 5 M of an oxidative agent comprising potassium ferrate, sodium ferrate, or a combination thereof; and
an aqueous alkaline solution comprising potassium hydroxide;
wherein the spotting fluid has a pH of about 4 to about 11 and is able to withstand a temperature of about 70° F. to about 250° F.; and
allowing the spotting fluid composition to interact with the filter cake surrounding the portion of the differentially stuck pipe over a period of time, wherein after the period of time, the spotting fluid composition contributes to a degradation of the filter cake surrounding the portion of differentially stuck pipe.
16 . The method of claim 15 , wherein the filter cake comprises a drilling mud, the drilling mud comprising a water-based mud, a brine-based mud, or a combination thereof.
17 . The method of claim 16 , wherein the drilling mud comprises a swellable clay, a polymer viscosifier, a weighting material, a chemical additive, a pH modifier, or any combination thereof.
18 . The method of claim 17 , wherein the polymer viscosifier comprises a natural polymer, a synthetic polymer, or a combination thereof.
19 . The method of claim 18 , wherein the polymer viscosifier comprises a natural polymer, and the natural polymer comprises xanthan gum, starch, or a combination thereof.
20 . The method of claim 18 , wherein the polymer viscosifier comprises a synthetic polymer, and the synthetic polymer comprises an acrylamide-based polymer.