3results about How to "Guarantee cementing quality" patented technology

The application provides a one-way sealing ring, a sealing mechanism, a tail pipe top packer and a tail pipe cementing process, wherein the one-way sealing mechanism comprises a center pipe, an upper deformed sleeve arranged on the outer wall of the center pipe, a lower deformed sleeve arranged on the outer wall of the center pipe, the upper deformed sleeve and the lower deformed sleeve being spaced apart in the axial direction, a sealing element arranged on the outer wall of the center pipe, the lower end of the sealing element being in abutment with the upper end of the lower deformed sleeve, an expansion cone arranged between the upper deformed sleeve and the sealing element, a sealing groove being arranged on the inner wall of the expansion cone in the circumferential direction, a sealing ring being arranged in the sealing groove, a flow-off groove being arranged on the inner wall of the expansion cone in the axial direction, the flow-off groove penetrating through the upper end and the lower end of the expansion cone, and fluid being allowed to flow only in one direction from the upper end of the expansion cone to the lower end of the expansion cone along the flow-off groove, while the fluid under the packer is allowed to flow upward, the wellhead annulus is allowed to be pressurized for cement setting, the pressure reduction caused by volume shrinkage is prevented to prevent the stratum fluid from flowing out, and the cementing quality is ensured.

The utility model belongs to the casing cement float collar float shoe technical field, and disclose a kind of casing cement float collar float shoe, including the upper end surface of casing float collar body is equipped with the float shoe device fixedly, the upper end surface of float shoe device is equipped with nickel-titanium alloy column framework fixedly, the inside of nickel-titanium alloy column framework is equipped with honeycomb deformable framework fixedly, the inside of honeycomb deformable framework is equipped with memory polymer fixedly, by nickel-titanium alloy column framework, honeycomb deformable framework and memory polymer, utilize nickel-titanium alloy telescopic characteristic and make float shoe adapt to different working conditions, honeycomb deformable framework enhances structural stability and adaptability, memory polymer outer layer accurate recovery shape plays the protection and sealing effect, guarantee well cementing quality.

The application provides application of a modified starch-based material in retarding of a high-temperature oil well cement system, and belongs to the technical field of oil well cementing cement. Octenyl succinic anhydride modified starch is added to the oil well cement slurry system, wherein the addition amount of the octenyl succinic anhydride modified starch is 0.1% to 2.0% of the cement mass. The modified starch is added to the oil well cement slurry system in an amount of 0.1% to 2.0% of the cement mass, can effectively delay the cement slurry thickening process under the high-temperature cementing condition of 90 to 150 DEG C, keep the thickening curve stable, reduce the risk of abnormal gelation, and has little adverse effect on the rheological property of the cement slurry and the mechanical property of the cement stone in the later period. The modified starch material is derived from renewable natural polymer resources, has the characteristics of environmental friendliness and stable retarding effect, and is suitable for cementing operation of deep and ultra-deep oil and gas wells.