Abstract: This invention relates to an improved method of cementing a casing string in a wellbore where the casing string will subsequently be heated by the injection of steam or by flowing of other hot fluids through the casing. The annulus between the wellbore and casing is at least partially filled with cement. A J-slot is positioned on the lower portion of the casing string. The lower end of a tubing string is provided with a stressing tool and lug, the lug being engageable with the J-slot and the tubing string is lowered into the casing and the lug is engaged with the J-slot. The tubing string is stressed until the cement in the annulus sets, thereby allowing the casing to be set under stress.

Abstract: This invention relates to improved methods for cementing a casing in a wellbore to prevent poor cement jobs by twisting the casing string under tension or compression while circulating the cement in the annulus between the casing and wellbore in a conventional manner. A J-slot is positioned on the lower portion of the casing. The lower end of the tubing string is provided with a turning and stressing tool and a lug, the lug being engagable with the J-slot. The lug and J-slot are engaged and the lower portion of the casing is caused to twist and stress while cement is being circulated in the wellbore/casing annulus.

Abstract: This invention relates to an improved method of cementing casing in a well where the casing string will subsequently be heated by the injection of steam or the flowing of other hot fluids through the casing. Long vertical anchor bars are positioned about the lower portion of the casing string. Lower holding means retains the lower ends against the casing string. Likewise, upper holding means holds the upper end against the casing. Means are provided for releasing the upper holding means and for forcing the upper ends of the anchor bars outwardly so that they engage and anchor against the borehole wall. Prior to the anchoring of the anchor bars, cement is circulated down through the casing string and up the annulus between the casing and the borehole wall, and during this time the casing can be rotated or moved up and down in accordance with good casing cementing practice.