【摘要】：鉆開油氣層時,在正壓差、毛管力的作用下,鉆井液中的固相進入油氣層造成孔喉堵塞,其液相進入油氣層與油氣層巖石和流體作用,破壞油氣層原有的平衡,從而誘發(fā)油氣層潛在損害因素,造成滲透率下降。由于水平井開發(fā)具有其特殊性(鉆井工藝難度大、與油層接觸面積大、接觸時間長、完井方式大多采用篩管完成、需要通過長的生產(chǎn)井段和大的泄油面積來提高單井產(chǎn)量),這種情況在水平井中則更為嚴重。學(xué)位論文以大港油田近年來使用的水平井鉆井液為主要研究對象,實驗研究了原鉆井液濾餅解除技術(shù)的各項技術(shù)指標(biāo),并分析了原鉆井液體系的不足,在此基礎(chǔ)上進行了GC系列水平井鉆井液濾餅解除技術(shù)的研發(fā)與評價。研發(fā)了三套具有強針對性的水平井鉆井液濾餅解除處理液體系。經(jīng)過體系處理過的巖心滲透率恢復(fù)率達到91%以上,體系中采用多種功用組分相互有機結(jié)合組成復(fù)合作用的工作液的方式,提高作用效果的同時,減少了工作液的種類,為體系現(xiàn)場應(yīng)用降低成本奠定了基礎(chǔ)。其主要性能指標(biāo)遠超過了現(xiàn)用體系(清洗、溶蝕、破膠),輔助性能指標(biāo)(防膨、穩(wěn)鐵、助排、緩蝕)也位居前列,達到了預(yù)期目的；并且還具有反應(yīng)速度快,施工工藝簡單,施工時間短的特點。完成現(xiàn)場先導(dǎo)性試驗14口井,試驗井施工成功率100%,無一井發(fā)生漏失等事故。施工中泵壓逐漸下降,排量逐漸上升,表明隨著施工的進行,井筒內(nèi)和近井壁處的鉆井液和鉆井液濾餅堵塞物被解除返出,液流通道被疏通；投產(chǎn)后液量充足,動液面高,產(chǎn)量基本達到或超過了配產(chǎn)水平；可對比井的米采液指數(shù)平均提高提高94.2%,試驗井米采液指數(shù)平均提高提高53.8%。
[Abstract]:When drilling oil and gas reservoir, under the action of positive pressure difference and capillary force, the solid phase of drilling fluid entering oil and gas reservoir causes pore throat blockage, and its liquid phase enters oil and gas reservoir with rock and fluid, thus destroying the original equilibrium of oil and gas reservoir. Therefore, the potential damage factors of oil and gas reservoir are induced, resulting in the decrease of permeability. Because horizontal well development has its particularity (drilling process is difficult, contact area with oil layer is large, contact time is long, completion mode is mostly completed by sieve pipe), It is necessary to increase single well production by long production section and large oil discharge area, which is more serious in horizontal wells. Taking the horizontal well drilling fluid used in Dagang Oilfield in recent years as the main research object, the technical indexes of the original drilling fluid filter cake removal technology are studied experimentally, and the deficiencies of the original drilling fluid system are analyzed. On this basis, the development and evaluation of filter cake removal technology for GC series horizontal well drilling fluid are carried out. Three sets of filter cake for horizontal well drilling fluid were developed. The recovery rate of core permeability treated by the system is more than 91%. In the system, the multiple functional components are combined with each other organically to form a compound working fluid, which improves the effect of the operation and reduces the type of the working fluid. It lays a foundation for the field application and cost reduction of the system. The main performance index is far more than the current system (cleaning, dissolution, gel breaking), auxiliary performance index (anti-expansion, iron stabilization, drainage, corrosion inhibition) is also in the forefront, achieving the desired purpose, and also has a fast reaction, simple construction technology, The characteristic of short construction time. There are 14 pilot test wells in the field, and the success rate of the test wells is 100. No leakage accident occurred in one well. The pump pressure decreases gradually and the displacement increases gradually during the construction, which indicates that the drilling fluid and filter cake clogging in and near the well wall are removed and returned with the construction, the fluid flow channel is dredged, the liquid quantity is sufficient and the moving liquid level is high after putting into production, The yield can basically reach or exceed the level of mixed production, and the average rice fluid recovery index of the test well can be increased by 94.2 and 53.8 percent on average, compared with that of the well and the test well respectively.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE254

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