Filter cake removal fluid
a filter cake and fluid technology, applied in the direction of transistors, radiation controlled devices, well accessories, etc., can solve the problems of reducing the effectiveness of filter cake breaking, premature flow of production fluids or leakage of clean up fluids into formations, and affecting the speed of reaction
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example 1
[0044] A filter cake as described above was prepared using formulation #1. The cake was prepared over 24 hrs using a 1.16 g / ml NaCl brine and 700 KPa differential pressure. After 4 hours, less than 4 ml of filtrate had been produced and the injection permeability was essentially zero.
[0045] A breaker fluid (32 lb / bbl ammonium persulfate) was applied at 67° F. and 700 KPa. The treating fluid broke through in 24 hours flowing at about 3 ml / hr. After about 2 hours additional time, the flow rate had increased to about 5 ml / min, and the test was terminated after 120 ml of the breaker fluid had been passed through the cell. The cell was allowed to cool and pressure was released. The filter cake was visually inspected and found to be composed of discrete carbonate particles with no evidence of starch or polymer. A recovered permeability test was run in the injection direction, with 3% recovered permeability. Recovered permeability testing in the production direction gave 64% of the origin...
example 2
[0047] A test similar to that in Example 1 was run, except formulation #2 with an anionic starch rather than a cationic one was used. The total fluid loss was about 30 ml in 24 hrs. After 24 hrs the cell was opened and emptied of the drill-in fluid. Breaker solution (120 ml), same as that used in Example 1 (32 lb / bbl persulfate salt), was added to the cell. The breaker fluid started to break through in 24 hours with a flow rate of ˜3.0 g. / hr. The breaker treatment was terminated after 34 hrs, during which time 64% of the breaker fluid had passed through the cell. The cell was allowed to cool and pressure was released. The filter cake was visually inspected and found to be composed of discrete carbonate particles with no evidence of any remaining starch or polymer. A recovered permeability examination run in the injection direction gave only 3% recovered permeability. In the production direction, however, 66% of the original permeability was recovered.
[0048] The remaining filter cak...
example 3
[0049] Using formulation #3, with a nonionic starch, filter cake build-up and treatment soaks were performed in the same manner as for Examples 1 and 2. Treatment with the breaker fluid (32 lb / bbl persulfate salt) used in Examples 1 and 2 at ˜68° F. gave 5% recovered permeability in the injection direction and 62% in the production direction without acid treatment.
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