Research And Application Of The Deep Well Cement Slurry In Liaohe Oil Field

According to the technology characteristic of the long cementing section of well cementing in Liaohe oilfield, this paper survey a large number of literature, analysis of the current main solution to the large temperature difference well cementing and the difficulties in the development of the large temperature difference cement slurry system, compared the temperature resistance and thickening time and temperature sensibility of the oil well cement additive in the current market, evaluate the suitable oil well cement additive for the large temperature difference cement slurry. From the perspective of materials science, this paper combine the theory of close packing of the mathematical model to research and design the large temperature difference cement system which can improve the well cementing quality.The cement slurry has high strength at low temperature after high temperature, through screen large amounts of reinforced material, and reasonable design the proportion of each material; Using the pressurized consistometer to inspect the thickening time adjustable of the cement slurry; Through the filtration experiment to inspect the compatibility between retarder and fluid loss agent; Through the high temperature and high pressure thinking time experiment to inspect whether there is the sensitive area between temperature and dosage of retarder; Using the BP tube to do the sedimentation stability experiment and evaluate the stability of the large temperature difference cement slurry system.In this paper, the cement slurry has good stability, the API fluid loss is less than 50 ml, the free fluid is 0, the thickening time can adjust, the compressive strength is greater than 20 MPa at bottomhole static temperature, and the static gel strength transition time is short. The cement slurry applied in two Wells in Liaohe oil field, the cementing quality is eligible by the sonic amplitude logging inspection.