The convertible bond market continued to hum Monday with word of one blockbuster offering and several smaller ones. Meanwhile the recently renascent IPO market suffered a setback when one of the bigger deals of the year was withdrawn. In Monday's biggest convertible filing, oilfield giant Halliburton ( HAL) announced plans to sell $1 billion of 20-year bonds to qualified institutional investors. News of the sale comes three days after the company disclosed bigger-than-expected losses on a Brazil project, a disclosure that sent its stock down about 8%. Meanwhile IMC Global ( IGL) filed a $125 million convertible deal, while McMorAn Exporation ( MMR) said it plans a $100 million offering. Elsewhere, Schlumberger ( SLB) unit NPTest Inc. withrdrew a proposed $575 million initial offering, citing "the condition of the securities markets." The company sells engineering services to semiconductor makers. Goldman Sachs, Salomon Smith Barney, Lehman Brothers and Morgan Stanley had been listed as underwriters.