本文選題：低密度 + 粉煤灰��； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：為縮短鉆井周期和節(jié)約成本,塔河油田普遍采用簡(jiǎn)化井身結(jié)構(gòu),但隨之出現(xiàn)了長(zhǎng)封固段、長(zhǎng)裸眼段固井的難題。雖然為了解決長(zhǎng)封固段固井漏失的問題,采用了尾管固井、雙級(jí)固井等工藝技術(shù),但未能取得很好的效果,沒有從根本解決固井漏失的問題。由于地層承壓能力低,常規(guī)密度水泥漿容易在施工中發(fā)生漏失,并且封固段較長(zhǎng),上下溫差大,水泥漿強(qiáng)度發(fā)展極不均勻,導(dǎo)致固井質(zhì)量較差,給后期作業(yè)帶來系列問題,縮短了油井開采時(shí)間,造成巨大的經(jīng)濟(jì)損失。因此,為了提高固井質(zhì)量,降低固井漏失風(fēng)險(xiǎn),根本上要從水泥漿體系入手,降低水泥漿的密度。 通過分析塔河油田十二、躍進(jìn)等區(qū)塊的固井現(xiàn)狀,了解了區(qū)域固井的難點(diǎn)并提出了相應(yīng)的提高固井質(zhì)量的措施。針對(duì)塔河油田地層承壓能力低、封固段長(zhǎng)的特點(diǎn),研究了適合該地區(qū)的密度為1.50g/cm3的粉煤灰低密度水泥漿體系,其流動(dòng)度、失水、稠化時(shí)間、抗壓強(qiáng)度、流變性等性能均能滿足施工要求。 粉煤灰低密度水泥漿體系密度易于調(diào)節(jié),便于現(xiàn)場(chǎng)施工,在溫度較低的情況下能有較高的早期強(qiáng)度,適合用于低溫、低壓、易漏地層的固井。該水泥漿體系不僅可以解決塔河油田固井質(zhì)量差的問題,而且對(duì)其他類似區(qū)塊復(fù)雜深井固井水泥漿體系的研究也有重要的指導(dǎo)意義。
[Abstract]:In order to shorten the drilling cycle and save the cost, the simplified well structure is widely used in Tahe Oilfield, but the problems of long sealing section and long open hole section are appeared. In order to solve the problem of cementing leakage in long cementing section, the technology of tail-pipe cementing and two-stage cementing has been adopted, but it has not achieved good results and has not solved the problem of cementing leakage fundamentally. Due to the low bearing capacity of formation, the conventional density cement slurry is easy to leak in construction, and the sealing section is longer, the temperature difference between upper and lower is large, the strength of cement slurry develops very unevenly, which leads to poor cementing quality and brings a series of problems to the later operation. The oil well production time is shortened, resulting in huge economic losses. Therefore, in order to improve cementing quality and reduce the risk of cementing loss, it is essential to start with cement slurry system and reduce the density of cement slurry. Based on the analysis of cementing status in areas 12 and Yuejin of Tahe Oilfield, the difficulties of regional cementing are understood and the corresponding measures to improve cementing quality are put forward. In view of the characteristics of low pressure bearing capacity and long sealing section in Tahe Oilfield, the fly ash low density cement slurry system with density of 1.50g/cm3, which is suitable for this area, is studied. Its fluidity, water loss, thickening time and compressive strength are studied. Rheology and other properties can meet the construction requirements. The density of fly ash low density cement slurry system is easy to adjust and field operation. It can have high early strength under low temperature and is suitable for cementing formation with low temperature, low pressure and easy leakage. The cement slurry system can not only solve the problem of poor cementing quality in Tahe Oilfield, but also have important guiding significance for the study of complex deep well cementing slurry system in other similar blocks.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE256

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