【摘要】：面臨著我國(guó)老油田的開發(fā)已經(jīng)進(jìn)入中后期的嚴(yán)峻形勢(shì),油井產(chǎn)油量嚴(yán)重下跌,如何研究應(yīng)用新方法挖潛剩余油藏,提高油井產(chǎn)油量,已經(jīng)成為各大油田迫切需要解決的任務(wù)。面對(duì)著國(guó)內(nèi)各油田產(chǎn)油量日益下滑的趨勢(shì),在老井中采用超短半徑開窗側(cè)鉆水平井工藝技術(shù)開發(fā)剩余油技術(shù)越來(lái)越受到各大油田的青睞,而超短半徑開窗側(cè)鉆水平井工藝技術(shù)的核心就是是否有一套科學(xué)合理的柔性鉆具設(shè)計(jì)。柔性鉆具的主要部件是導(dǎo)向篩管和柔性鉆桿,故導(dǎo)向篩管和柔性鉆桿結(jié)構(gòu)設(shè)計(jì)以及力學(xué)分析是否合理直接影響柔性鉆具在鉆井過程中能否成功進(jìn)行造斜鉆進(jìn)和水平鉆進(jìn)。為此,本文根據(jù)超短半徑水平井技術(shù)特點(diǎn),對(duì)超短半徑水平井柔性鉆具進(jìn)行了結(jié)構(gòu)設(shè)計(jì),并進(jìn)行了力學(xué)分析。采用理論分析方法,考慮導(dǎo)向篩管開槽結(jié)構(gòu),對(duì)導(dǎo)向篩管每節(jié)長(zhǎng)度、豎縫的夾角、豎縫的長(zhǎng)度、豎縫寬度和橫縫寬五個(gè)主要參數(shù)進(jìn)行設(shè)計(jì),建立導(dǎo)向篩管強(qiáng)度評(píng)價(jià)準(zhǔn)則,提出最優(yōu)結(jié)構(gòu)�？紤]導(dǎo)向篩管與井壁的接觸,以導(dǎo)向篩管和井壁為研究對(duì)象,采用梁?jiǎn)卧?建立導(dǎo)向篩管和井壁接觸非線性有限元模型,并對(duì)其進(jìn)行力學(xué)分析,得到導(dǎo)向篩管危險(xiǎn)截面載荷;為評(píng)價(jià)導(dǎo)向篩管強(qiáng)度,取單節(jié)導(dǎo)向篩管為研究對(duì)象,采用實(shí)體單元,建立單節(jié)導(dǎo)向篩管局部有限元模型,將整體模型得到的危險(xiǎn)截面載荷加到局部模型上,對(duì)其進(jìn)行強(qiáng)度評(píng)價(jià),得到開窗點(diǎn)軸向力為40kN,鉆進(jìn)90°導(dǎo)向篩管滿足強(qiáng)度要求�？紤]柔性鉆桿能夠通過一定曲率半徑的井眼,根據(jù)幾何關(guān)系和強(qiáng)度條件,對(duì)單節(jié)柔性鉆桿的長(zhǎng)度、球頭柱鍵的直徑、球頭連桿和上球座的內(nèi)徑等主要參數(shù)進(jìn)行結(jié)構(gòu)設(shè)計(jì)�？紤]球頭柱鍵與球頭連桿凹槽、上球座與球頭連桿球頭的接觸,取單節(jié)柔性鉆桿為研究對(duì)象,采用實(shí)體單元建立單節(jié)柔性鉆桿接觸非線性有限元模型,對(duì)其進(jìn)行強(qiáng)度評(píng)價(jià),得到造斜段柔性鉆桿能承受小于2kN?m的扭矩,水平段柔性鉆桿能承受小于40kN的鉆壓和小于2kN?m的扭矩。
[Abstract]:Facing the severe situation that the development of the old oil fields in China has entered the middle and late stage, the oil production of oil wells has seriously fallen. How to study the application of new methods to tap the remaining oil reservoirs and improve the oil production of oil wells has become an urgent task to be solved in each major oil field. In the face of the declining trend of oil production in domestic oil fields, the development of remaining oil technology by using ultra-short radius windowed sidetracking horizontal well technology in old wells is more and more favored by major oil fields. The core of ultra-short radius sidetracking horizontal well technology is whether there is a set of scientific and reasonable flexible drilling tool design. The main components of flexible drilling tool are guide screen pipe and flexible drill pipe, so whether the structural design and mechanical analysis of guide screen pipe and flexible drill pipe can directly affect whether the flexible drilling tool can successfully carry out oblique drilling and horizontal drilling in the drilling process. Therefore, according to the technical characteristics of ultra-short radius horizontal wells, the structure design and mechanical analysis of flexible drilling tools for ultra-short radius horizontal wells are carried out in this paper. By using the theoretical analysis method and considering the slotted structure of the guide screen tube, five main parameters, namely, the length of each section of the guide screen tube, the angle between the vertical joints, the length of the vertical joints, the width of the vertical joints and the width of the transverse joints, are designed, and the evaluation criteria of the strength of the guide screen tubes are established. The optimal structure is put forward. Considering the contact between the guide screen tube and the shaft wall, the nonlinear finite element model of the guide screen tube and the shaft wall contact is established by using the beam element, and the dangerous section load of the guide screen tube is obtained by mechanical analysis. In order to evaluate the strength of the guide screen tube, taking the single section guide screen tube as the research object, the local finite element model of the single section guide screen tube is established by using the solid element, and the dangerous section load obtained by the whole model is added to the local model, and the strength is evaluated. The axial force of the window opening point is 40kN, and the 90 擄guide screen tube is drilled to meet the strength requirements. Considering that the flexible drill pipe can pass through a hole with a certain curvature radius, according to the geometric relationship and strength conditions, the main parameters such as the length of the single flexible drill pipe, the diameter of the ball head column key, the inner diameter of the ball head connecting rod and the upper ball seat are designed. Considering the contact between the ball head column key and the ball head connecting rod groove, and the contact between the upper ball seat and the ball head connecting rod ball head, the single flexible drill pipe is taken as the research object, and the nonlinear finite element model of the single section flexible drill pipe contact is established by using the solid element, and its strength is evaluated. It is found that the flexible drill pipe in the inclined section can bear the torque less than 2kN?m, and the flexible drill pipe in the horizontal section can bear the drilling pressure less than 40kN and the torque less than 2kN?m.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TE92

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