Drilling fluid system name

Plugging and returning type workover fluid system

Matching core finishing agent

Viscosity increasing suspension concentrate HPV    Oil soluble temporary plugging agent PFA

System characteristics

1、The plugging agent has good oil solubility and its oil solubility can reach 99.9%.

2、A plugging agent is a small molecule compound, which does not increase viscosity in crude oil;

3、he viscosity-increasing suspending agent is easy to degrade, which can be degraded after workover operation, so it will not affect the production of oil wells;

4、Under various permeable leakage conditions, when the dosage of PFA is 3.0-5.0%, the plugging fluid system can withstand the pressure of 7.0 MPa, which has a good plugging effect on permeable leakage;

5、The plugging agent can be recovered by removing plugging, while the recovery value of core permeability after plugging is greater than 90%;

6、There is no "plugging cannot be solved" worry in the process of using leak plugging agent, also it do not need to carry out complex plugging process.

Application situation

The system has been successfully applied in Bohai oilfield.

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