The Well Of Casing Damage In No 3 Fault Block Of Pubei Area Prevent Synthesisly And The Field Test Research

As the oil field development, distortion and the harm of the oil and water well casing has affected regular production of the crude oil seriously, has posed the very big threat to the stable production of oil field, simultaneously has also created the huge economic loss to the oil field, Putaohua oil field began to develop since 1978, had 169 oil and water wells to discard because of the damage of the casing, in spite of the damage of casings,there are also 270 wells to produce , moreover the well of casing damage still increase in the speed of 20-30 every year, the north of the Putaohua oil field (as follow refers to as"the north of Putaohua oil field") was the most serious area of wrap damages, at present the wells of casing damage accumulate to 335. They occupie 75.11% to the number of total casing damage wells of No 7 oil extracting factory. No 3 fault block is the main area of casings damage in Pubei oil field, the rate of casing damage is higher, in which casing damage rate of foundation well pattern has reached 44.3%, the damage of oil and water well are the important fact which restricts to enhance the benefit of oil-field development.This article classified analysis wells of casing damages of No 3 fault block in Pubei oil field, has studied the distributed rule of drive pipe damage well in longitudinal, crosswise and the type of wrap damages, lothological characteristic of the spot of the wrap damages, and discovered in the longitudinal wrap damages the well mainly to distribute the perforated interval and he mud shale stratum above the perforated interval . The well of wrap damaged in the plane still mainly to distribute in the fault both sides, Large expanse of wrap damage in the partial region. The lithological character of spot of wrap damage mainly is the mudstone. Damages. According to the distributed rule of the wells of wrap damage and the characteristic, by generalized analysising different type, the primary cause of disfigurement in different spot, discussed the oil water well drive casing damage to form the mechanism, which find the oil water well casing damage and distorted to be very many, mainly was by the geologic agent, the engineering factor and the corrosion factor and so on, but in its essence was by unbalanced the pressure to cause. The stratum pore pressure forecasting technology is the key or reasonable control lamination pressure, by the screening analysis, had determined to use three curve law to forecast the stratum pore pressure, and by the result of forecast the foundation, the union oil-field development actual condition, the comprehensive utilization of irrigation structure adjustment, the government of decompression measure, plane pressure setting and so on to adjust the pressure distribution condition, enable the plane, the longitudinal pressure texture to tend to the balance, thus eliminated the hidden danger of the wrap damage, the government effect of the wrap damages to be obvious, and make the protection of damage work for the next wrap to provide the theory basis.