Self-developed new scraper improves descaling efficiency

Recently, a new type of oil pipe descaling scraper developed by Zhang Xiaojian Innovation Studio of China Crude Oil Field Oil Production Engineering Service Center was put into use, which solved the problem that the dirt and skin on the inner wall of the well pipe were not clean, resulting in a low number of finished products and the high cost of replacing the scraper, and improved the qualification rate
of water well pipe descaling and repair.

Pucheng Oilfield repairs an average of 28,000 well pipes into the workshop assembly line every year
.
Mechanical dynamic descaling is the key process of well pipe repair, which is to remove the dirt attached to the inner wall of the well pipe recovered by the operation, and then carry out the water well pipe quality inspection
.
At present, the descaling scraper in the tubing repair workshop uses two sets of switchblade blocks
.
Through on-site investigation, Zhang Xiaojian Innovation Studio of the center found that the blade of the scraper is out of sync when it is stretched, and it is easy to break the knife; In the same scraping scale, the thickness or hardness of the dirt skin is different, and the expansion and expansion of the switchblade is biased, resulting in descaling into flake residue, resulting in incomplete
descaling.
And the descaling equipment is replaced every 4 days, the cost is high, and the descaling qualification rate is only 84.
3%.

In order to solve the above problems, the team used the principle of auger drilling to change the A group knife block into a fixed knife block, and changed the straight cutting edge of the knife block to a blade with inclination, so that the minimum cutting diameter of the knife block is 56 mm, the maximum cutting diameter is 62 mm, and the overall conical state is formed from low to high, and the dirt skin in the tube is gradually removed from shallow to deep spiral to avoid hard cutting damage to the knife block
.
Group B knife blocks still use switchblade blocks, and the overall cutting diameter is 62 mm, which guarantees maximum descaling effect
.

After using the new tubing descaling scraper, the descaling qualification rate increased to 94.
6%.

The service life of the scraper is extended by 5 days, saving 40 scrapers and saving 58,000 yuan per year; Calculated according to 340 working days per year, 6,997 more descaling oil pipes can be repaired, creating economic benefits of nearly 210,000 yuan
.