How to set a casing pipe?

Steel casing pipe is a type of piping equipment used in the oil and gas industry for drilling, production, transportation and control of well fluids. It is usually a long steel pipe installed in oil or natural gas wells to maintain the wellbore structure. The integrity of the well, control of fluid transport, and isolation of fluids in different formations in the well. Petroleum casing has the functions of protecting the wellbore, controlling fluids in the well, and isolating formations.

The industrial chain of the casing industry includes multiple links, covering all stages from raw material procurement to final product manufacturing and services. The synergy of the entire industry chain enables oil casing to meet the needs of the oil and gas industry, from exploration to production and Transportation, providing important support for the construction and maintenance of oil and natural gas wells.

Casing is lowered section by section in the wellbore by a drilling machine. The process of lowering oil casing is usually divided into the following steps:

1. Prepare the casing

1) Check the total number of casings at the well site, as well as the number of casings that should be run into the well, the number of short casings, the number of casing centralizers, and the number of spare casings. Spare casings are placed separately and clearly marked.

2) Check the inner diameter of each casing with a standard diameter gauge. When the diameter gauge is thrown in from the direction of the coupling, damage to the internal thread by the diameter gauge should be avoided. In principle, the casing should be passed manually. If a special pneumatic device is used for diameter adjustment, a plan must be made and safety should be paid attention to.

3) Use cleaning agent to carefully clean the internal and external threads. When cleaning, use a qualified brush. It is prohibited to use a wire brush; the wire guard should be cleaned and re-tightened.

4) Visual inspection: Check the casing steel grade and pipe body surface. If there are dents or scars, do not enter the well.

5) Check the couplings: Check the number of exposed buckles of the manufacturer's original couplings. The standard remaining buckles should not exceed 2 buckles, otherwise the well cannot be entered.

6) Thread inspection: Check whether the internal and external threads are intact. Those with unqualified threads are not allowed to enter the well and are marked and placed separately.

7) Casing length measurement: Length measurement is accurate to centimeters using rounding method. The length of a single casing is its total length minus the length of the external thread. The requirements for various threads are: API round threads are at the "vanishing point" or final graduation line mark of the thread; trapezoidal threads are based on the bottom edge of the triangular symbol printed on the pipe body; other special threads are based on the manufacturer's manufacturing standards. measuring point. When measuring casing, the engineering and well logging personnel shall measure it more than twice and calibrate it. Write the length and well entry number on the casing body with white paint and keep records.

8) Prepare the casing substructure as designed.

2.Drilling

First, you need to use a drilling machine to drill a well hole in the ground.

3.Install casing

After drilling to a certain depth, you need to install casing in the wellbore. Casing is generally composed of sections of steel pipe. The length and diameter of the steel pipe are determined according to the depth of the wellbore and geological conditions. The process of installing casing requires the use of casing pliers to place the casing section by section into the wellbore until a predetermined depth is reached.

4. Cementing

After installing the casing, cementing is required. The purpose of cementing is to prevent well wall collapse and to control wellhead pressure. The process of cementing usually involves injecting cement slurry into the gap between the casing and the well wall, allowing it to solidify into a solid wall.

5.Connector

During the installation of casing, joints need to be used to connect each section of casing. The joint is usually composed of two threaded parts, which are connected by rotation to form a complete oil casing.

In short, oil well casing is lowered section by section in the wellbore by a drilling machine, and steps such as casing installation, cementing, and joints are required. This process requires professional personnel and equipment to operate and monitor to ensure underground safety and stability.

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