The Measures To Improve High Anti-Collapse Casing Life
The problem of casing damage seriously restricts oil and gas production, reduces the production life of oil and gas wells, and leads to a decline in oil field production and great economic losses. Reasons for deformation and damage of high anti-extrusion casing:
Geological and technological factors
Geological factors: large sections of salt rock layers and salt-gypsum layers exist. There are many salt rock layers, mud and gypsum coexist with high salt purity; faults are developed; formations are severely sanded; ancient geostress and modern geostress are abnormal. Process factors: high-pressure water injection; repeated perforation and other offensive stimulation measures; ultra-high-pressure large-scale fracturing; well completion and cementing quality, etc.
High quality of anti-extrusion casing
Low material strength, poor impact toughness, excessive wall thickness unevenness and ovality, excessive residual stress, etc., will reduce the anti-extrusion performance of the casing. The surface quality of the pipe during the rolling process and the uniformity and consistency of the material heat treatment process are also factors that affect the anti-extrusion performance.
The casing design and selection are unreasonable
The design redundancy of casing collapse strength is insufficient, and the matching of parameters such as steel grade and wall thickness is unreasonable. According to the conventional anti-extrusion design of the overburden pressure, the safety redundancy cannot fully meet the abnormal requirements of the salt rock layer and the salt-gypsum layer, resulting in the failure of the anti-extrusion casing early deformation. Insufficient understanding of formation stress and errors in formation pressure prediction have brought difficulties to casing selection and design.
Measures to improve the service life of high anti-extrusion casing:
1. Material selection and processing and manufacturing process characteristics of high anti-extrusion casing
Adjust the composition of steel alloys, appropriately increase the content of chromium and molybdenum alloys, improve the structure, and strictly control the content of harmful elements such as S and P. Improve the strength and toughness, improve the impact performance, the full-scale impact performance of the complex salt rock layer high collapse resistance casing at 0 ℃ reaches 80J or more, which meets the requirements of ultra-high collapse resistance.
2. Improved design of high anti-extrusion casing combination
For high-stress formations such as salt-gypsum layers, high-stress casing design and selection should take into account the reasonable matching of steel grade and wall thickness, and determine the minimum wellbore size according to the requirements of oilfield development and production. The wall thickness grade is preferred, and then the high-steel anti-extrusion casing is selected according to the design requirements of ground stress. Consider the special wellbore structure of deep wells, as well as the direct connection type thread or the special thread connection structure of small couplings. The use of higher-grade steel-grade conventional wall thickness and high anti-extrusion casing can not only meet the requirements of well completion and cementing, but also achieve high Crush strength requirements.
3. Other
Optimize the wellbore structure and wellbore trajectory design; improve the quality of completion and cementing; optimize the main technological measures such as perforation, fracturing, and drainage.
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