本文選題：小井眼 + 成膜鉆井液��； 參考：《東北石油大學(xué)》2015年碩士論文

【摘要】：小井眼鉆進(jìn)與常規(guī)井眼相比可以大大節(jié)約鉆井費用,因此已經(jīng)越來越多地應(yīng)用于深井復(fù)雜井以及老井開窗側(cè)鉆等鉆井作業(yè)當(dāng)中。但鑒于小井眼的環(huán)空間隙小、壓耗大、易塌、易漏的難題,對鉆進(jìn)過程中的小井眼鉆井液技術(shù)也提出了新的挑戰(zhàn),如小井眼鉆井要求鉆井液具有良好的剪切稀釋性、流動性、潤滑性和良好的抑制造壁、防塌、懸浮攜帶能力。本文調(diào)研了國內(nèi)外現(xiàn)有的小井眼鉆井液技術(shù),系統(tǒng)分析了小井眼鉆井液存在的技術(shù)難點,從而確定出本文需要解決的鉆井液難題:攜巖懸?guī)r問題、高密度下的問題,潤滑防卡問題和儲層保護(hù)問題。在常用的體系中選擇出抑制性和儲層保護(hù)效果好的成膜聚合物鉆井液體系作為研究的基礎(chǔ)漿,使其性能進(jìn)一步優(yōu)化和提高,從而滿足小井眼鉆進(jìn)的需求。通過實驗添加高溫提黏劑提高體系的攜巖懸?guī)r能力、優(yōu)選封堵劑提高體系的封堵能力,優(yōu)選配伍性好的潤滑劑和表面活性劑復(fù)配使用,降低油水界面張力,提升體系潤滑效果,同時結(jié)合理想充填暫堵技術(shù)進(jìn)一步提高體系的儲層保護(hù)效果,最終確定出抗高溫成膜乳化鉆井液體系的配方為:5.00%~6.00%膨潤土+4.50%~5.00%純堿Na OH+0.10%~0.15%KPA+0.2%~0.4%高溫提黏劑GZN+2.00%~3.00%磺化酚醛樹脂+2%~3%高效封堵降濾失劑DYFT-1+2.00%~3.00%抗高溫抗鹽防塌降濾失劑KFT+2.00%~3.00%高溫封堵劑GFD-1+2%~3%隔離膜CMJ-2+2%~3%理想填充劑+1%~2%白油+1%乳化劑(LHR-1)+1%~3%防卡降阻劑+3.00%極壓潤滑劑ORH-030+3.00%液體潤滑劑YDRH-1。室內(nèi)評價表明抗高溫水基成膜乳化鉆井液高溫條件下性能更穩(wěn)定,防塌、攜巖、潤滑能力更強。濾失量低,巖心動態(tài)滲透率恢復(fù)達(dá)90%以上,有效降低界面張力,且反排壓差較低,減少水鎖損害,達(dá)到很好的儲層保護(hù)效果。抗污染能力強,用Fe SO4處理HCO3-污染有效。最后該體系在黃沙坨小井眼長水平段進(jìn)行了先導(dǎo)實驗。現(xiàn)場應(yīng)用沒有因鉆井液而發(fā)生起下鉆遇阻、遇卡等故障復(fù)雜,中完、完井電測一次成功率100%,油層段平均井徑擴大率≤10%,下套管、固井順利,現(xiàn)場測試的表皮系數(shù)較低,試氣產(chǎn)量較高,取得良好的經(jīng)濟效益和社會效益。
[Abstract]:Compared with conventional borehole drilling, slim hole drilling can save drilling cost greatly, so it has been used more and more in drilling operations such as complex wells in deep wells and sidetracking in old wells. However, in view of the problems of small annulus clearance, large pressure consumption, easy collapse and easy leakage, new challenges have been put forward to the drilling fluid technology in the process of drilling, such as the good shear dilution and fluidity of the drilling fluid required by slim hole drilling. Lubricity and good inhibition of wall building, anti-collapse, suspension carrying capacity. In this paper, the existing small hole drilling fluid technology at home and abroad has been investigated, and the technical difficulties existing in the small hole drilling fluid have been systematically analyzed, so as to determine the problem of drilling fluid which needs to be solved in this paper: the rock carrying problem, the high density problem. Lubrication prevention and reservoir protection. The film-forming polymer drilling fluid system, which has good inhibition and reservoir protection effect, is selected as the basic slurry for further optimization and improvement of its performance in order to meet the needs of small hole drilling. By adding high temperature viscosifier to improve the rock carrying capacity of the system, the plugging agent can improve the plugging ability of the system, the lubricant and surfactant with good compatibility can be used to reduce the interfacial tension between oil and water, and the lubricating effect of the system can be improved. At the same time, combined with ideal filling temporary plugging technology, the reservoir protection effect of the system can be further improved. Finally, the formula of high temperature film forming emulsification drilling fluid system was determined as follows:% 5.00% bentonite 4.50% NaOH 0.10%~0.15%KPA 0.2wt% sodium hydroxide 0.2wt% high temperature tackifying agent GZN 2.003.00% sulfonated phenolic resin 2o 3% high efficiency plugging and reducing fluid loss agent DYFT-1 2.003.00% high temperature salt resistance, resistance to sloughing and draining control agent KFT 2. 00% high temperature plugging agent GFD-1 2 and 3% isolation membrane CMJ-2 2 and 3% ideal filler 1 and 2% white oil 1% emulsifier LHR-1) 3% anti-blocking agent 3% extreme pressure lubricant ORH-030 3. 00% liquid lubricant YDRH-1. The laboratory evaluation shows that the high temperature water-based emulsion drilling fluid is more stable, anti-collapse, rock-carrying and more lubricating under high temperature conditions. The dynamic permeability of core is over 90% which can effectively reduce the interfacial tension and reverse pressure difference reduce the damage of water lock and achieve a good reservoir protection effect. It is effective to treat HCO 3-pollution with Fe SO4. Finally, the pilot experiment was carried out in the long horizontal section of Huangshatuo well. The field application did not occur because of drilling fluid and the drilldown was blocked, the faults such as jam were complicated, the completion rate of electric logging was 100, the average diameter expansion rate of reservoir was 鈮，

本文編號：1847362