RU2016119189A - The design of the tubing, casing and method of assembling them in the casing for production wells - Google Patents

Claims (24)

1. The design of the tubing and casing pipe, including a pipe with calibrated ends and attached pipes, characterized in that the calibrated pipe ends and the associated inner surfaces of the pipes are made with a cylindrical and conical surfaces, while the conical surfaces are stepped with the formation of grooves in which solder or adhesive sealant is placed. 2. The design of the pipe according to claim 1, characterized in that the pipes are made of a tube stock with a length necessary for threading, key engagement and landing with an interference fit of at least 1.5 times the outer diameter of the pipe made of more durable metal than the pipe material. 3. The design of the pipe under item 1, characterized in that the geometry of the mating surfaces of the pipe and nozzles provides a guaranteed fit with an interference fit, forming an integral, tight connection. 4. The design of the pipe under item 1, characterized in that the inner diameter of the pipe and the inner diameter of the pipe are equal. 5. The design of the pipe according to claim 1, characterized in that the connection of the pipe and nozzles is made with an internal sealing assembly formed by contacting thrust conical surfaces made on the nozzles. 6. The design of the pipe under item 1, characterized in that the nozzles are made with a tapered thrust thread. 7. The pipe construction according to claim 6, characterized in that the conical thrust thread at the nozzles is made with a taper of 1:16, the angle of inclination of the support face of the coil profile from -2 ° to + 4 ° to the normal of the axial line of the thread and the angle of inclination of the embedded face of the profile turn 10 ° -30 ° to the normal to the center line of the thread. 8. The design of the pipe according to claim 6, characterized in that the conical thrust thread at the nozzles is equipped with a sealing ring made of elastomeric material with reinforcement. 9. The pipe construction according to claim 6, characterized in that the conical thrust thread is made in increments (P) depending on the diameter (d) of the pipe in the ratio range P = d / 50-100, at d≈50 ÷ 300 mm, profile thread turns are made with angular ratios of the supporting and auxiliary sides as -2 ° / 30 °, the nominal ratio of thread sizes: - the height of the thread profile in the working area is not more than h≈0.57Р, - the width of the blunting of the top of the turns f≈0,29Р, - the average diameter of the thread at the work site

; - the internal nominal diameter of the thread on the working section d ₁ ≈d-1,13P, - the width of the thread depression f _to ≈0.22P, - the radii R ₁ and R _{2 of the} conjugation in the depression with the sides of the profile of the thread are connected by the ratio R ₂ ≈2R ₁ , where R ₁ is the radius of mating with the supporting surface of the thread profile (-2 °) and R ₁ ≈0,06Р, R ₂ is the radius of the interface with the auxiliary surface of the thread profile (+ 30 °), r ₁ and r ₂ are the radii of blunting the top of the threads, r ₁ ≈r ₂ ≈0.1Р. 10. A method of connecting a tubing and a casing pipe, including calibrating the ends of the pipes, connecting the ends of the pipes to the nozzles and connecting them to each other using a thread, characterized in that the angle of inclination of the conical mating surfaces of the connection is selected so that the total cutting thickness of all The protrusions at the base were more than the wall thickness of the pipe. 11. The method according to p. 10, characterized in that the pipes and pipe before connection are subjected to heat treatment separately. 12. The method according to p. 10, characterized in that the preparation and calibration of the pipe ends for alignment and geometry is carried out by a press at both ends simultaneously. 13. The method according to p. 10, characterized in that the connection of the nozzles with the pipe is carried out on a horizontal press while heating the nozzles to a temperature of from 100 ° to 600 ° C. 14. The method according to p. 10, characterized in that after checking the geometric dimensions, hydraulic tests, protective coatings are applied to the inner and outer surfaces of the pipes. 15. The method according to p. 10, characterized in that the sealing mating surfaces have a taper that causes a wedging effect when a torque is applied.