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As a plant which produces palm oil and kernels, the oil palm is a very popular plant, and has become a major source of non-oil and gas foreign exchange for Indonesia. On one hand, this results in the rapid growth of the oil palm industry, however, it also increases disposal of waste such as lignocellulosic material like oil palm shells, stems, etc. all of which pollute the environment. Oil palm shell waste can be used as an extender for cementing in the petroleum industries, because oil palm shells are a pozzolanic material which contain silica. Cost efficiency is another reason: this material can reduce cementing costs, because it is cheaper than other lightweight materials. The purpose of this paper is to demonstrate that oil palm shell charcoal can be used to replace part of the cement, to reduce the weight of conventional cement slurry (15.8 ppg for class G Portlandcement) while increasing compressive strength. Compressive strength tests in conformity with API Specifications 10A were carried out in this research. The ratio of shell material to cement in cement slurry was varied between 15:85, 25:75, 35:65, 40:60, 45:55, 50:50, at a temperature of 140°F and pressure of 14.7 psi, all testing was performed within 8 hours. The progress of compressive strength applied to every shell charcoal added in the test can be used to determine the correct composition in using this material in mixing cement. The results of this research demonstrated that the maximum composition of shell charcoal to cement is 50:50 and that the material can reduce the weight of cement slurry. Oil palm shell charcoal has added value, can be used in the petroleum industry to replace ingredients of basic cement and reduces environmental pollution, because it recycles the waste disposal from oil palm industries, turning them into useful material with economic value.