Study The Repairing Force And Damage Mechanism For The Cement Loop During Repairing Destroyed Casing

Casing damage hasbecame the hot one of problems that petromleum engineering pay attention to. year by year the rise of caing damage speed affects the production of the oil-field seriously. For saving the high expenses of drilling the renewal well, the repair for the casing damage well have became one of the important mission of the oil-field engineerings.For avoiding the repaired well channeling caingdamage for repairing craft taking place, guaranteeing the casing damage welll repaired can canwork noemal and longevous, developing the cement loop damage mechanism in the caing damage repairing process and studying the structure of casing damage area , to increase to fix the well quantity, have the important theories meaning and the engineering meaning.Conforming the repainging force and the cement loop damage in the repairing progress is a complicated problem for the mechanics of elastic and plastic geology mechanics repairing material mechanics and material strength theory etc. several courses and realm, the test datas and covariance datas of the field and Stat express:pats of caing damage well repaired appears damage again in a short time, investigating its reason, one is cement loop for a long-term damage, two is excess damage of caing pipe. The repairing process of casing damage well is the process of casing taking place character distortion and afresh replacement.while the complicated elasticity and character distortion taking place at casing damage part and neighboring casing,To minishing the damage from repairing man's damnification to casing and cement loop It is must to direction the technics process of repairing well in the theory, surrounding this problem,aim at the grind press and plastic technics process which oil field often use.The text develop the following work:l.By analyzing and studying,take cognizance of the repairing process of casting damage well having connection with the form of casing damage,So We entirely analyse that the shape of casing pipe checking technology and the infection to repairing well technics process.2.According to grind press plastic skill characteristic, using Hertz elasticity contiguity theory to solude contiguity stress of casing pipe and put forward the basic theories to certain the least drilling press.3. according to the theories of Slip to move the line in the plastic extreme limit analysis method, structure the stress field of casing damage area and casing undamage area, to compute to the stressand the length of cement loop damage.4. Establish the integral fiber model that is casing pipe as fiber and is cement loop and stratum as complex base body. Theoretical instruction is provided for the elevating quality of repairing the well by analyzing the mechanism of cement loop' damnification.5. It is very important that the decrease of repairing the casing damage well process by using of the shaping tools of reasonable strcucture and reasonable drilling stress. At the same time, it is the key technical measure for decreasing the damnification of cement sloop by elevating the cement slurry capability.According to the redamage of the casing damage well repaired lead to enormous economic loss, therefore, the text provides important theoretical basis for elevating the quality of repairing well and the utilization rate of renovation well.