Small Casing Layered Injection Hydrolysis Thin Oil Development Challenge

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China Drying News Co., Ltd. thin oil development can not be separated from the water injection, but the small wellbore problem has stuck the neck of the fine water injection, Liaohe Oilfield successfully developed a small wellbore fine layered water injection technology for them to open the network. As of December 5, the technology tested 15 wells in small casing water injection wells, the success rate was 100%, the effective rate was 93.3%, and 2 patents were filed.

Zhang Xiaowen, a senior engineer at the Liaohe Oilfield Drilling and Production Institute, said that the successful development of small water jackets for fine water injection and supporting technologies is a major breakthrough in the development of waterflooding reservoirs, enabling effective displacement and utilization of all dilute wells corresponding to this type of wells. .

Due to the small borehole size of small casing wells, domestic oilfields generally use the general water injection or oil jacket dispensing method, which can realize two-layer water injection and can not wash wells and test. In 2012, researchers from Liaohe Oilfield successfully developed a small casing washable stratified water injection pipe string and related testing technologies to meet the requirements for three-tiered injection and testing of small casing water injection wells.

Drilling technicians said that they have successfully developed a 4-inch K344 washable water packer, a small-diameter concentric water distributor, a small-diameter concentric measuring instrument and its associated equipment, which is used to wash the column. After the well can be repeatedly set up, intelligent test, test data, direct reading on the ground, to achieve a 4-inch casing more than three layers of note and test. This technology has reached the leading domestic level.

At the same time, they redesigned and optimized the size and internal structural material of the original bridge-type eccentric water distributor. They also developed a small-diameter bridge-type eccentric water distributor and used the existing bridge-type eccentric adjustment and adjustment linkage technology to carry out test adjustment to achieve a 5-inch set. Three levels of dispensing and testing. The technology can also be applied to the 5-inch half-reduced diameter bushings with a diameter of 110 mm or more to realize the subdivision water injection of casing deformation wells. At present, the technology is applied 6 times, and the on-site test passing rate is 100%.

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