本文選題：涇河油田 + 水平井�。� 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：涇河油田在油氣勘探開(kāi)發(fā)過(guò)程中第四系、志丹群、延長(zhǎng)組等地層出現(xiàn)了滲漏和較為嚴(yán)重的井漏,揭開(kāi)油層過(guò)程中缺乏有效的儲(chǔ)層保護(hù)措施。為了有效預(yù)防井漏,提高堵漏的成功率,實(shí)現(xiàn)提速目標(biāo),確保評(píng)估油層的準(zhǔn)確性和及時(shí)性,提高油產(chǎn)量,開(kāi)展本研究。本研究主要是用彈性斷裂力學(xué)有限元法來(lái)確定隨井筒鉆井液柱壓力變化裂縫寬度變化情況,目的是通過(guò)計(jì)算機(jī)模擬,找出裂縫寬度變化與井筒壓差的關(guān)系,最終建立裂縫寬度與井筒壓力、地層巖石力學(xué)特性參數(shù)及裂縫長(zhǎng)度的預(yù)測(cè)模型。研究結(jié)合上部漏失的主要層位Q4、志丹群的具體情況,研究形成了防漏、循環(huán)段塞堵漏、1-6mm縫寬橋接堵漏配方及施工工藝,堵漏承壓達(dá)到6MPa。針對(duì)目的層延長(zhǎng)組的井漏,研究形成了保護(hù)儲(chǔ)層的酸溶性防漏堵漏體系配方及其施工工藝,防漏體系對(duì)縫寬200-300 1um裂縫具有較好的防漏效果,封堵率可達(dá)100%,承壓可以達(dá)到8MPa；酸溶性堵漏配方對(duì)1-5mm縫寬具有較好的堵漏效果,承壓達(dá)到6MPa。對(duì)于漏層不好判斷、漏失空間大、水層等情況,橋接堵漏措施不能解決時(shí),形成了高失水漿等惡性漏失堵漏配方及工藝。由于儲(chǔ)層的吼道半徑1μm以下,常規(guī)的處理劑粒徑很難達(dá)到封堵的要求,通過(guò)加入納米乳液形成的體系在低孔低滲儲(chǔ)層近井壁處快速形成致密的封堵帶,封堵率達(dá)到99%以上,巖心滲透率恢復(fù)率平均達(dá)到87%,可阻止外來(lái)固相、液相侵入儲(chǔ)層深部傷害地層。相關(guān)技術(shù)在JH17P11井、JH2-1井和JH69P25井得到了成功應(yīng)用,有效防止了滲漏,堵漏成功率100%,儲(chǔ)層保護(hù)取得明顯效果。
[Abstract]:In the process of exploration and development of oil and gas in Jinghe Oilfield, the formation of Quaternary, Zhidan Group and Yanchang formation appeared leakage and serious well leakage, and the effective reservoir protection measures were lacking in the process of uncovering the reservoir. In order to effectively prevent well leakage, improve the success rate of plugging leakage, achieve the goal of increasing speed, ensure the accuracy and timeliness of reservoir evaluation, and increase oil production, this study is carried out. In this paper, the finite element method of elastic fracture mechanics is used to determine the variation of fracture width with the pressure of wellbore drilling fluid string. The purpose of this study is to find out the relationship between the change of fracture width and the pressure difference of wellbore through computer simulation. Finally, the prediction models of fracture width, wellbore pressure, formation rock mechanics parameters and fracture length are established. Combined with the specific situation of Q4 and Zhidan group of upper layer leakage, the leakage prevention formula and construction technology were formed. The leakage plugging formula and construction technology of 1 ~ 6 mm wide bridge joint in circulating slug were obtained, and the plugging pressure was up to 6 MPA. According to the well leakage in the Yanchang formation of the target layer, the formula of acid soluble leakage and plugging system and its construction technology for protecting reservoir are studied. The leakage prevention system has good leakage prevention effect on the fracture width of 200-300 1um, the plugging rate can reach 100 and the pressure can reach 8MPa. The acid-soluble plugging formula has a good effect on the gap width of 1-5mm, and the pressure can reach 6 MPA. When the leakage layer is difficult to judge, the leakage space is large, the water layer and so on, the bridge plugging measures can not be solved, the formulation and process of the malignant leakage plugging such as high water loss pulp are formed. Because the radius of the reservoir is less than 1 渭 m, it is difficult to meet the requirement of sealing by the conventional particle size of the treating agent. By adding the system formed by nano-emulsion, the tight sealing zone is formed rapidly near the well wall of the low porosity and low permeability reservoir, and the plugging rate is over 99%. The average recovery rate of core permeability is 87, which can prevent the external solid and liquid phase from invading the deep formation of the reservoir. The related techniques have been successfully applied in well JH17P11, well JH2-1 and well JH69P25, effectively preventing leakage, plugging success rate of 100, and achieving obvious results in reservoir protection.
【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)】：TE243;TE358

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本文編號(hào)：2100161