存储式井温测井在高温高压储层人工裂缝高度评价中的应用

通过压前、压后井温曲线对比,能够较准确计算水力压裂高度,为判断压裂效果提供依据。青海油田油气藏勘探开发从中低渗透砂岩储层向致密的变质灰岩基岩储层发展,水力压裂储层改造技术呈现出高温、高破裂压力的施工特点。为解决高压高温的井温测井,仪器优选高性能存储式井温仪,工艺采用高压防喷装置、电缆测井方式。通过现场2口井测试,检测了压裂裂缝高度,达到了纵向上认识压裂效果的目的,进一步验证了工艺的科学性和实用性,解决了高温高压压裂缝高评价的难题,完善了高温高压压裂效果评价手段。

Application of Memory Well Temperature Logging to Evaluation of Hydraulic Fracture Height in High Temperature & High Pressure Reservoir

There are three main methods to evaluate the effect of hydraulic fracturing at present in the detection of the fracture height , the temperature well logging is most convenient and practical .By comparing the temperature curve of the well before and after the hydraulic fracturing ,the fracturing height can be calculated accurately ,which provides a basis for judging the effect of fracturing . With the development of Qinghai oilfield exploration , oil and gas reservoirs are found to develop from medium low permeability sandstone reservoirs to tight reservoir rocks (gneiss ) , hydraulic fracturing reservoir reconstruction technology shows high temperature ,high rupture pressure construction characteristics ,and the corresponding fracturing effect evaluation technology is faces a series of problems :One is whether the performance of logging equipment can meet the downhole high temperature & high pressure test ;The other is whether the well logging technology can overcome the well of the wellhead high pressure for test . In order to solve the well logging technique in high pressure and high temperature ,we elaborate on the logging scheme ,optimize high performance storage well temperature instrument ,use the high pressure blowout prevention device ,and the cable logging method .Through the field test of two wells ,the fracturing height is detected ,the purpose of understanding the fracturing effect is achieved in the vertical direction ,the scientific and practical technology of the process is further verified ,the problem of high temperature & high pressure fracturing effect evaluation is solved , so improving the high temperature and high pressure fracturing effect evaluation means .