The problem book consists of two parts and 14 chapters. The first part contains tasks on hydraulics, the second - on gas dynamics. Each chapter refers to a specific section of oil and gas hydromechanics. All chapters contain a theoretical reference part, questions for self-control of the degree of assimilation of the material and examples of solving typical problems. The main part of each chapter is the tasks proposed for self-solution. This edition of the problem book is supplemented with new interesting tasks, including increased complexity. The subject of the problems under consideration is typical for the oil and gas industry.