【摘要】：長慶油田所處的鄂爾多斯盆地油氣藏屬于“三低”(低壓、低滲、低豐度)油氣藏,并有相當一部分屬于致密油氣藏,開發(fā)難度大,開發(fā)成本高,嚴重制約了油田增產(chǎn)目標,增大了油氣開采成本。為此,長慶油田在勘探開發(fā)中進行了長慶特色的體積壓裂“工廠化”大偏移距叢式三維水平井組作業(yè)模式的先導(dǎo)試驗。研究三維水平井關(guān)鍵鉆井技術(shù)對控制鉆井成本,縮短鄂爾多斯盆地油氣藏的開發(fā)周期具有重要實踐意義。本文采用空間圓弧設(shè)計方法推導(dǎo)了三維水平井軌跡設(shè)計理論模型,以G0-7井組靖60-22H2井為例進行了井身剖面參數(shù)；在軌跡設(shè)計的基礎(chǔ)上,推導(dǎo)了三維叢式水平井鉆柱摩阻扭矩預(yù)測模型,結(jié)合靖60-22H2井設(shè)計軌跡、鉆井參數(shù)和鉆柱結(jié)構(gòu)對靖60-22H2井二開和三開的鉆柱摩阻扭矩進行了計算,根據(jù)摩阻扭矩計算結(jié)果校核了鉆柱強度,以鉆柱模擬扭矩最小為目標,優(yōu)化了三維水平井鉆柱結(jié)構(gòu),提出了降摩減阻工藝技術(shù)措施。本文采用彈性穩(wěn)定理論,研究了彎外殼螺桿鉆具在彎曲井眼內(nèi)的受力和變形特性,推導(dǎo)了同一跨內(nèi)有兩種不同剛度的梁柱在不同外載作用下端部轉(zhuǎn)角的變剛度計算模型,預(yù)測了彎外殼結(jié)構(gòu)參數(shù)、鉆井參數(shù)、井眼幾何形狀等對彎外殼螺桿鉆具造斜率的影響,并采用現(xiàn)場實鉆數(shù)據(jù)對理論預(yù)測結(jié)果進行了對比分析。研究結(jié)果表明,G0-7井組三維叢式水平井的造斜點500m,造斜率在0-6。/30m范圍內(nèi)變化,水平段長度1000m,扭方位254。,滿足鄂爾多斯盆地“三低”油氣藏高效開發(fā)的需要；通過鉆柱摩阻扭矩分析,優(yōu)選出水平井段的鉆柱結(jié)構(gòu)為；彎外殼螺桿鉆具的結(jié)構(gòu)彎角、井斜角、鉆壓對螺桿鉆具的影響較大,隨著構(gòu)彎角、井斜角、鉆壓的增加,螺桿鉆具造斜率增加；井眼擴大會降低螺桿鉆具的造斜造斜能力。本文提出的三維水平井軌跡設(shè)計與軌跡控制、摩阻計算與降摩減阻措施等關(guān)鍵性鉆井技術(shù),除在G0-7井組鉆井施工過程中成果應(yīng)用外,還在蘇東南致密氣、寧定安83、西233和林鎮(zhèn)區(qū)塊等長慶油田多個三維水平井井組施工區(qū)域得到推廣應(yīng)用,現(xiàn)場施工效果良好。經(jīng)過油田實踐的檢驗和驗證,表明所提出的三維水平井鉆井工藝技術(shù)對氣田的鉆井技術(shù)有重要的指導(dǎo)意義。
[Abstract]:The Ordos Basin oil and gas reservoirs in Changqing Oilfield belong to "three low" (low pressure, low permeability, low abundance) oil and gas reservoirs, and a considerable part of them belong to tight oil and gas reservoirs, which is difficult to develop and has high development cost, which seriously restricts the goal of increasing oil production. The cost of oil and gas exploitation is increased. Therefore, the pilot test of large offset cluster three-dimensional horizontal well group operation mode with Changqing characteristics has been carried out in Changqing Oilfield. It is of great practical significance to study the key drilling technology of three-dimensional horizontal well to control drilling cost and shorten the development cycle of oil and gas reservoirs in Ordos Basin. In this paper, the theoretical model of 3D horizontal well trajectory design is derived by using spatial circular arc design method, and the wellbore profile parameters are carried out by taking Jing60-22H2 well group of G0X7 well group as an example. On the basis of trajectory design, the prediction model of friction torque of drill string in three-dimensional cluster horizontal well is deduced. Combined with the design trajectory of Jing60-22H2 well, drilling parameters and drill string structure, the friction torque of drill string in Jing60-22H2 well is calculated. According to the calculation results of friction torque, the strength of drill string is checked, and the drill string structure of three-dimensional horizontal well is optimized with the goal of minimizing the simulated torque of drill string, and the technical measures of reducing friction and drag are put forward. In this paper, the stress and deformation characteristics of curved shell screw drilling tool in curved wellbore are studied by using elastic stability theory, and the variable stiffness calculation model of end rotation angle of Liang Zhu with two different stiffness in the same span under different external loads is derived. The effects of curved shell structure parameters, drilling parameters and wellbore geometry on the slope of curved shell screw drilling tool are predicted, and the theoretical prediction results are compared and analyzed by using the field drilling data. The results show that the inclination point of the three-dimensional cluster horizontal well group is 500m, the slope is changed in the range of 0 鈮，

本文編號：2479815