Squeeze cementing in carbonate reservoirs
Carbonate oil reservoirs are often fractured, either by nature or by design. They are completed with long perforated intervals, have low BHT gradients, and have low fluid levels. These characteristics must be considered as well as the types of cement slurries to be used, the pump-in pressure, and the type of packer, in a satisfactory squeeze cementing job. Slurry selection is as follows: (1) highly accelerated cement slurries pumped ahead of moderate fluid loss cement slurries, (2) moderate fluid-loss cement slurries pumped ahead of slurries containing bridging materials, or (3) combinations of the two. Jobs used between 200 and 400 sacks. Squeezing pressure limitations are subject to controversy;however, squeeze pressures in the range of 4,000 to 8,000 psi are not necessarily detrimental. Standing pressure of 500 to 1,000 psi over initial pump-in levels is used to check bleed-off. Bleed-off indicates fractures are not full and more slurry is needed. The basic squeeze cementing tools are the drillable and the retrievable packers. Packer selection and packer setting are dependent upon the details of the job involved.
- Research Organization:
- Halliburton Co
- OSTI ID:
- 5071060
- Report Number(s):
- CONF-700466-
- Journal Information:
- Proc. Annu. Southwest. Pet. Short Course; (United States), Conference: 17. annual southwest petroleum short course associational meeting, Lubbock, TX, USA, 16 Apr 1970
- Country of Publication:
- United States
- Language:
- English
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