Technology And Research Tools Changqing Oilfield Deep Water Segment

With the development of the oil industry and oil and gas field development, there are more low-permeability oil field, and the condition of the development is getting more harsh.Due to the reservoir buried deeper and deeper and the penetration rate getting lower and lower, the conventional layered water injection craft can no longer meet the current needs of the development.In the layered water injection development of low permeability oilfield and deep well, due to the high temperature and pressure, the injection string obviously suffers from pressure, temperature and a variety of other effects.Under the combined action of these effects, the injection string will produce a large deformation in the axial direction and the packers on the string will also suffer from a large force.The long distance movement of water injection string and the high force the packers suffered from will lead to the failure of the layered water injection craft.In order to ensure the efficient and safe of the layered water injection craft, it is necessary to accurately grasp the force and deformation of the injection string and the packers.This paper researches five basic effect the injection string suffered from, builds up the force and deformation of mathematics and mechanics model when the composite string is in different conditions and compiles relational calculation software.Calculating the deformation of the string and the force of the two packers suffered from with the calculation, combining the true situation of Ansai block of Changqing oilfield and analyzing the influencing factors of the deformation of the string and the force of the packers, including pressure, the inner diameter of casing and the distance between the packer.According to the result, the structure of the layered water injection string is designed and improvedo The matching tools are also researched and improved in this paper, increasing long-distance Compensator. This paper evaluates the effect of the non-metallic hydraulic anchor in laboratory and field, preferably the packer rubber tube material, and optimizes the material of the rubber tube.The analysis result of this paper can provide scientific foundation for the layered water injection in deep well, improving the effect of injection craft and the Economic benefits.