Zhongyuan Cementing successfully built a model project for Wei 11 gas storage

China Petroleum & Chemical News.
com recently, the Cementing Company of Zhongyuan Petroleum Engineering Company received a letter of commendation from the Zhongyuan Oilfield Gas Storage Capacity Building Project Team, in which the company's Zhongyuan Project Department completed 10 wells of Wei 11 gas storage with high quality and efficiency.
Praise for cementing construction tasks
.

A total of 10 wells were drilled in the Wei 11 gas storage.
In order to ensure the safety and standardization of the gas storage and the completion of high-quality and high-efficiency construction, the company firmly established the concept of "a century-old plan, quality first", paid close attention to technical research, and refined the cementing plan.
In the end, the cementing quality of 8 wells of Wei 11 gas storage was achieved, and the construction performance of 2 wells was excellent, and the cementing model project of gas storage was created
.

The new system drives away the "blockers" of salt solution

Wei 11 gas storage is located in the salt interval of 200 to 500 meters, which is the best cap layer for gas storage, but it is a difficult problem for cementing construction
.

The company quickly carried out technical research on how to improve the cementing strength of the interface, optimize the structure of the annular slurry column, and reduce the risk of leakage.
After multiple demonstrations and hundreds of tests, the company developed a salt-resistant tough cement slurry system and supporting facilities.
The salt-bed cementing technology successfully solved the technical problem that the salt-bed cementing is easy to pollute the cement slurry and improved the cementing quality of the salt-gypsum layer
.

　　New technology to block gas stumbling block

　　Wei 11 gas storage is a typical depleted sandstone gas field with low formation pressure coefficient.
How to solve the "stumbling block" of formation cracks that are easy to pass through with old wells and "ventilation" channels has become an important part of the cementing construction of Wei 11 gas storage.
Big problem
.

　　While absorbing the plugging technology of old wells at home and abroad, the company has continuously improved and innovated the cementing process in accordance with the needs of depleted sandstone gas reservoirs for gas storage construction and combined with the geological characteristics of the Weicheng block.
The idea of ​​"outside" well plugging is to squeeze the producing interval, continuously inject ash plugs into the wellbore, and inject anticorrosive heavy mud on the overlying, and implement secondary sealing for locations outside the pipe that may cause gas leakage.
Completely cut off the fluid leakage channel to achieve the plugging effect
.

　　Fine management to curb cement "pouring sausage"

　　During the cementing operation of Wei 11 gas storage, the annulus gap is small, and the cement slurry channel between the wellbore and the outer wall of the casing is easily blocked by cuttings and the pump is blocked, causing a "sausage filling" accident
.

　　Unblocking the circulation channel and preventing the failure of the cement plug is the top priority to ensure the completion of the gas storage
.