The issuance of $500 million in senior notes will provide Schlumberger with additional capital, which could be used for various corporate purposes. However, it also increases the company's debt load, which may affect its credit profile. The interest rate of 5.000% is relatively moderate, suggesting manageable interest expenses. Overall, the impact on the stock price is likely to be neutral in the short term as the market digests the implications of the new debt issuance.