(Instruction to Casing head Installation)

1. Generals

T10 3/4 × 7 （ 5 1/2 ） -35 casing head is a product designed in accordance with the user’s demand, which is mainly used to fix the well mouth of drilling well, to connect the casing column in the bottom of well and to reliably seal and control the circular space between casings, and it’s a important component for oil (gas) extraction device of oilfields. The basic parameters are as follows:

Casing program: 10 3/4 × 7 （ 5 1/2 ）

Surface casing: technical casing

2. Installation of Main Body of Casing head

2.1 Take out and store up the upper cap, slip and other components after opening the box for use while hanging oil casing.

2.2 Take out the main body of casing head after the surface casing is being fixed, clean the surface casing and the main body of casing head, directly connect the main body of casing head with the screw thread of surface casing with 7 inch drilling slip and fasten according to the torque of casings.

2.3 Cautions:

Do not knock the ring groove and inner screw threads on casing head body so as to prevent from effecting the installation and sealing performance of upper cap.

3. Installation of casing head and BOP before second spud-in:

3.1 Scrub away each connection part between the main body of casing head and BOP, coat lubricating grease at steel ring groove.

3.2 Install the ring φ 388 into the ring groove on the main body of casing head for hoisting and nipple up of BOP.

3.3 When the BOP is aligned with ring groove and seated after hoisting and nipple it up, fasten it evenly with 16 stud bolts M42 × 3.

4. Installation of groupware inside the casing head before completion:

4.1 Run the oil casing in a way that the last casing connects with upper well-tie joint after second artesian.

4.2 Uninstall the screw in slip groupware, buckle two slips and slip seats on the bottom part of well-tie joint and oil casing coupling, and then fasten them with two inside hexagonal bolts. Install orderly lower gaskets, rubber packing and upper gaskets, then install and fasten 12 slip bolts, and complete the installation the slip groupware.

4.3 Calculate correctly the distance between the working plane of well-tie joint and the taking-place position of slip (see Diagram 1) , low down the slip to the well head, then lift up well-tie joint 300 mm when it taking place, and waiting for cementing and slurry. Reposition the slip after cementing.

4.4 When BOP is lift up, check the slip if it have been in the proper position. If the upper part of slip groupware is at the bottom part of casing head’s screw threads, it is showed that the slip groupware has been in the right place.

4.5 Installation of upper cap

4.6 Uninstall the lower well-tie joint and BOP; rinse the screw threads of upper cap and screw threads inside the main body of casing head; coat lubricating grease, pay attention not to scuff O seal ring; screw tightly 2 technological bolts on the upper cap; when the upper cap and screw threads are tightened by screwing subject to the torsion moment standard, install the protection cap and uninstall flange, installation of casing head is completed fully.