Short-lived Well Cause Analysis And Governance Measures

ShengLi production second district of ShengTuo NingHai oilfield 40 years of exploration and development, second district of ShengTuo oilfield enters into high water cut,NingHai later, restricted by developing high water, high contain arenaceous, high salinity medium, the pump and poor hang deep, well conditions, resulting in the comprehensive influence factors are expounded, part of short-term oil Wells, frequent homework, constrain the comprehensive economic benefit of oilfield development enhancement. In recent years, through detailed technical management, strengthening technical improvement, expounded the downward trend in oil Wells (got better control, holder has extended period of oil, but still no big change. Therefore, we must take comprehensive measures to prevent "well", in order to achieve short-lived improve the economic efficiency.This article through to sucker rod, so biased wear governance from oil stem tube caused biased wear reason:string structure, production parameters, pump hang depth, produced fluid properties, well conditions on five aspects of a detailed analysis. String structure:when assembly anchoring easily causes string bending, lead to stem tube partial ground; String on the series packer, the more serious the more eccentric wear. Production parameters aspects:the same pump hang the production parameters, sucker rod column inertial load and vibration load of sucker rod, the greater the effect of stability, the greater the biased wear occurred stem tube, the higher the frequency. Pump hang depth aspects:when the production parameters must, pump the deeper, hang the sucker rod column is also more easily occur bending eccentric wear instability. Output fluid properties aspects:output, the greater the liquid through liquid viscosity of all frictional resistance, swimming, the more it is apt to cause the rod string eccentric wear bending happen; Sand content of produced fluid, the greater the plunger pump cylinder with the friction between the rod string, the greater the resulting downstream resistance is larger, the occurrence of intensifying the eccentric wear. Well conditions aspects:azimuth and coordinates change big Wells, easy to cause the stem tube eccentric wear contact occurred; Pump deeper than shafts inflection point that hang the deeper, slant pump hang grinding the more serious. Then, through the base material and field data analysis by stem tube judge the eccentric wear lay Wells, caused mainly alignment causes combine existing technology, give specific technological measures to management. The high degree of corrosion caused by eccentric wear, implement regular gal corrosion inhibitor, at the tubing surface and sucker rod surface forming thicker of lubricant, both reduce corrosion function, and a slowing lubrication, eccentric wear stem tube. According to well conditions cause partial grinding technology:use two-way protection sucker rod are setting up, anti-wear vice sucker rod, sucker rod automatically rotating device etc advanced technology, slow stem tube eccentric wear well, give slant grinding pointed out the governance of short-lived thinking.The sand is oilfield exploitation process in oil layer with fluid from sand, is the phenomenon of migration out of oil well production, one of the difficulties faced by oil from sand will lead not only to cut production and ground and underground or equipment wear and tear, but exacerbate the casing damage, serious when may result in oil Wells are out, so scrap sand prediction and management scheme researches are particularly important. Through the introduction of sand control type on choosing 41.9% this method for the evaluation, sand control effect cappability work development provides theoretical basis.Pump failure is "well" frequent short-lived, according to one of the main form of containing the decency, high salinity, hydrogen sulfide-bearing corrosion, water sensitivity, energy is bad, the paraffin to block, pump improvement based on material, through a material improvement, strength and corrosion resistance greatly improved, effectively reduce the number of well" "short-lived.The frontier top application of blasting technology, on the one hand, casing deformation serious cause the oil Wells casing shrink diameter well, the casing string of leakage current multiplied, thus returns Wells to seal technology can not oil card containing Wells, high-pressure difference high oil Wells sealing shrink diameter well casing and scaling oil Wells, corrosion large difference between layers in separate injection Wells, portion of seal leakage of oil Wells well sealed achieve long-term effective card, on the other hand solved string complex, the subsequent measures to implement bring hazard.