套管地锚

在井眼内将套管底端与地层锚在一起的装置。套管柱中安装套管地锚之后，在固井作业可以人为地给套管施加一定的向上的预应力。该预应力待水泥浆凝固后仍然存在，从而减少高温热采作业中对套管的损坏。在普通井中放置套管地锚时，可确保固井时套管伸直聚中，水泥环完整，防止出现套管裸露在外被生锈腐蚀。

技术参数及规格：1.安全系数大于2时，地锚**允许拉力为1000KN

               2.地锚撑爪张开时**外径为500-590毫米，适用于208-300毫米不同岩性地层的井眼。

               3.地锚不打开时**外径Φ200毫米。

               4.最小流道截面积3317mm。

               5.悬挂销钉剪断压力为6MPa。

               6.提预应力之前须憋压15-20MPa打开撑爪。

               7.使用套管工程直径Φ177.8毫米。

Casing Anchor

Fixed casing anchor inside Casing string, duringcement job the casing can be artificially given a certain upwardprestressed power and this power can be still exist after cementpaste hardened, thus can reduce the damage during the hightemperature thermal work. When setting the casing anchor into thecommon well it can insure the casing in cementing extending andcentralizing, prevent the rust and the eroding of thecasing.

The technological parameter andspecifications:

1: When the safety factor is greater than 2 thetolerance pulling power of the anchor is 1000KN.

2: The max.O.D. is 500-590mm when the anchor isopen, it can be adaptable to the holes in different lithologicgeology.

3: The max.O.D. is Φ200mm when the anchor isclosed.

4: The min. of the channel section is3317mm.

5: The shearing pressure of the suspended pin is 6Mpa.

6: The staying claw should be opened and it isneed to hold pressure 15-20Mpa before the prestressedis lifted.

7: The ratablediameter of the useable casing is Φ177.8mm.