Styrenic block copolymers as thermally activated tackifiers for oilfield applications
A technology of block copolymers and blends, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as formation damage
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Embodiment 1
[0063] Caking performance
[0064] The extent of product expected caking and aggregation during storage was measured as described. Said polymer is packed in the cylinder mold, and design weight, to simulate by the product in 6 feet high (100lb / ft 2 ), place the weight on top of the cylinder and keep the cylinder at 110°F for 7 days. The mold was removed and the force required to break the resulting "bump" was measured. By convention, at ≤150lbs / ft 2 Samples that ruptured were rated "1" (very favorable) at 150-300lbs / ft 2 Samples that ruptured were rated "2" at 300-1,000lbs / ft 2 Class "3" for samples that rupture when required, and require >1,000lbs / ft 2 The grade of the sample is "4" (not desired). Comparative non-pulverizing diblock AB1 requires 790 lbs / ft 2 of breaking force.
[0065] Table 2
[0066] sample
Caking force (lbs / ft 2 )
caking grade
CAB1
330
3
CAB2
258
2
CAB3
248
2
CAB4
248
2
...
Embodiment 2
[0070] Thixotropic Fluids of C-A-B Block Copolymers in Mineral Oil
[0071] Unless otherwise specified, at room temperature by adding the polymer to the specified base fluid and using Silverson TM The starting samples were prepared by high shear mixer mixing at 2,000-4,000 RPM for just the time to disperse the polymer (taking care to avoid heating the solution). originally in mineral oil 110) to prepare a solution with 4 wt% polymer. Under these conditions, the polymer CAB1 with the shortest C block was found to dissolve in a viscous solution, exhibiting a cloudy blue hue. Polymer CAB4 with the longest isoprene block also dissolved, giving a very viscous solution, while polymers CAB2 and CAB3 formed dispersions showing some viscosity and a blue tinge, but stood at room temperature for weeks Remains pourable afterwards. To complete dissolution of the polymer, the fluid was transferred to a pressure chamber; with nitrogen, the headspace was purged by filling to 50 psi and v...
Embodiment 3
[0081] Thixotropic Fluids Containing C-A-B Block Copolymers in Alkyl Paraffin Fluids
[0082] exist 1416 (a linear alkyl paraffin fluid) prepared a dispersion containing 4 wt% CAB3 and CAB4. Both CAB3 and CAB4 formed stable dispersions in this low polarity fluid. There was little evidence of polymer dissolution as evidenced by an insignificant increase in fluid viscosity and no development of a blue tinge. This state is maintained for several days when stored at room temperature. Note, however, that the block copolymer particles tend to settle on standing; noticeable settling occurs within hours. Both suspensions converted to thixotropic fluids when aged overnight in a tumble oven at 200°F. exist figure 2 The viscosity profile as a function of temperature is shown in . The temperature at which the rapid viscosity loss begins for fluids containing CAB3 is about 120°C (248°F), and for CAB4 at least about 150°C (302°F); the slope of the curve remains fairly constant up to...
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