NEW YORK — PLH Group Inc. has acquired three companies involved in the horizontal drilling, pipeline maintenance and environmental restoration markets.

Casa Grande, Ariz.-based Southeast Directional Drilling LLC specializes in underground horizontal drilling services for the oil and gas, municipal water, and telecom industries, while Eupora, Miss.-based M&M Pipeline Services LLC provides site preparation, project closing, environmental and maintenance services to pipeline construction general contractors, according to Chicago-based investment bank Lincoln International LLC.

PLH also bought Livingston, Ala.-based Energy Services South LLC, the subterranean division of M&M, which offers pipeline maintenance, gathering-system installation, repair, overhaul and niche midstream services for pipeline owners and operators, according to the statement.

Terms of the deals were not disclosed.

PLH Group is owned by Short Hills, N.J.-based private equity firm Energy Capital Partners.