I. Overview:

In view of the new well production substitute slurry construction mud along the tubing string overflow spatter pollution to the wellhead construction personnel brought a lot of inconvenience at the same time bring a lot of safety risks. The application of anti-fouling device in the new well can make the pressure balance of the oil sleeve of the slurry pipe string in the downhole, and can wash the well directly and backwards, and finish the sizing work. The tool is advanced in design. The structure is reasonable. The movements are flexible. Reliable use. The features of convenient operation are the necessary products for the new well to be put into production.

II. Structural characteristics:

The assembly diagram is as follows:

III. Physical photographs:

IV.Technical parameters:

Outer diameter: φ 110mm

Length: 575mm

V. Scope of application:

It is suitable for all new wells.

VI. Usage instructions:

1. Check tools:

Tools must be carefully checked before going down to make sure the tools are in good condition. The check reads as follows:

(1) whether the two ends of the connection thread are intact or not.

(2) there shall be no permanent deformation on the outer surface of the tool after collision.

(3) all anti-release pins shall be tightened and shall not be exposed to the surface of the matrix.

2. The well under the tool must be sand-washed to the bottom of the artificial well: it must be open to the well to ensure that it is not obstructed and the out-of-gauge passage of the well must be greater than the maximum external diameter of the tool.

3. Downhole tubing and tools must be kept clean. The tubing is made up of standard tubing gauges, accurate measurement of tubing dimensions, thread coating and fastening of oil to ensure that 20MPA does not leak.

4. The down-hole operation rules and safety regulations should be strictly carried out in the tool downhole. The operation is stable and the speed is moderate (30 / H), should not be raised sharply) in the process of downhole. Brake. Let go. The wellhead must be fitted with an indicator.

5. The tool is installed at the lower end of the substitute string and has a middle-pass structure. In the process of lowering the string, due to the action of the single-flow valve at the bottom end of the sand, the mud will not enter the substitute string. When the mud in the casing produces a certain pressure on the pipe string, the bypass mechanism of the anti-fouling device in the new well will be opened, and the mud will enter the pipe string from the bypass mechanism to maintain the pressure balance of the pipe sleeve.

1. Tools out of the factory for the whole factory, use units must not be disassembled, lest after assembly can not reach the original technical performance.

2. The used tools are delivered to the original shipping unit for maintenance to ensure its performance.

3. This product should be transported and stored to avoid collision and rain, both ends of the buckle with wire protection.

4. This product shall be placed on the shelf and shall not overlap. The sun is in the sun. Rain, do not touch acid. Alkali. Salt and other corrosive substances, tools require more than 1 meter away from the heat source.