Method for designing salt rock stratum irregular-shaped sleeve

• Main Authors: ZHANG JIE, LI CUINAN, QIAO KAICONG, ZHOU WEI, YANG LANTIAN
• Format: Patent
• Language: Chinese; English
• Published: 10.07.2013
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention relates to a method for designing a salt rock stratum irregular-shaped sleeve. According to different salt rock stratum creep stress states, by changing the inner diameter or outer diameter of the irregular-shaped sleeve, the sleeve cross section shape suitable for a crustal stress level condition is determined. The irregular-shaped sleeve has the following two forms: an inner wall of the sleeve is circular, and an outer wall of the sleeve is oval; and an inner wall of the sleeve is oval, and an outer wall of the sleeve is circular. When the irregular-shaped sleeve is put into a shaft, the position with the maximum wall thickness and the direction of the maximum horizontal crustal stress are uniform. By means of the method, effective stress of a sleeve body under an uneven horizontal crustal stress state can be effectively reduced, the sleeve can be prevented from being damaged, and the technical problem that the strength of the sleeve with the existing wall thickness under the uneven horizontal