本文關(guān)鍵詞：耐壓減輕材料及低密度水泥漿體系研究　出處：《西南石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 耐壓 低密度 減輕劑 水泥漿 顆粒級(jí)配

【摘要】：隨著勘探開發(fā)速度的加快,高溫、低壓易漏井越來(lái)越多,低密度水泥漿體系是解決低壓易漏地層固井的主要方法。而常規(guī)低密度水泥漿減輕材料:粉煤灰、微硅、膨潤(rùn)土、礦渣等對(duì)水泥漿密度降低能力有限;氮?dú)狻⑵胀ㄆ榈兔芏人酀{體系耐壓性能較差;空心玻璃微珠水泥漿體系成本較高,不能推廣使用。針對(duì)以上問(wèn)題,本文研制出承壓能力達(dá)到60MPa的低成本復(fù)合減輕劑,開展了抗180℃高溫,密度在1.20g/cm3～1.60g/cm3之間的低密度水泥漿體系研究�；陬w粒實(shí)際堆積形態(tài),建立三級(jí)顆粒緊密堆積模型和四級(jí)不確定粒徑顆粒緊密堆積模型。由三級(jí)顆粒級(jí)配模型得到三級(jí)級(jí)配顆粒粒徑比為1:0.464:0.268;研制出堆積體系空隙度測(cè)試裝置,并對(duì)堆積體系空隙度進(jìn)行測(cè)試。研究結(jié)果表明,一級(jí)大顆粒、二級(jí)中顆粒、三級(jí)小顆粒體積比為6:1:3時(shí)三級(jí)顆粒緊密堆積體堆積最為緊密系空隙度最小,為34.01%。對(duì)顆粒緊密堆積體系內(nèi)三級(jí)顆粒體積比進(jìn)行微調(diào),得出大、中、小三級(jí)顆粒體積比在[7～10]:[1～2]:[2～2.5]之間時(shí)堆積體系空隙度差別較小,顆粒堆積較為緊密。將理論模型與實(shí)驗(yàn)驗(yàn)證相結(jié)合,研制出密度范圍分別為0.87g/cm3～1.04g/cm3、1.01g/cm3～1.23g/cm3,承壓能力分別為40MPa、60MPa,適用水泥漿密度范圍在1.20g/cm3～1.60g/cm3之間的復(fù)合減輕劑JQ-1和JQ-2,其成本低于1.69萬(wàn)元/噸。通過(guò)大量實(shí)驗(yàn)證明該種復(fù)合減輕劑與常規(guī)油井水泥漿添加劑配伍性良好,具有較強(qiáng)的抗高溫性能。本文還利用研制的復(fù)合減輕劑開展了密度為1.20g/cm3、1.40g/cm3、1.60g/cm3的低密度水泥漿體系承壓能力、高溫穩(wěn)定性、流變性、水泥石滲透率、水泥石在高溫下的強(qiáng)度發(fā)展情況等性能研究。研究結(jié)果表明,該類低密度水泥漿體系具有較好的抗高溫穩(wěn)定性,漿體上下密度差小于0.02g/cm3;流變性能較好,流動(dòng)度大于19cm;API失水量小,低于60ml;在循環(huán)溫度140℃～180℃條件下,稠化時(shí)間在154min～527min之間可調(diào),稠化曲線良好,基本為直角稠化;水泥石抗壓強(qiáng)度高,密度為1.20g/cm2、1.40g/cm、1.60g/cm3三種低密度水泥漿體系75℃水浴箱常壓養(yǎng)護(hù)2d后抗壓強(qiáng)度分別為16.28MPa、26.46MPa、30.25MPa;論文還對(duì)三種低密度水泥漿抗高溫性能、水泥石抗壓強(qiáng)度及膠結(jié)強(qiáng)度受溫度影響性能、水泥石滲透率等性能進(jìn)行研究。結(jié)果表明,復(fù)合減輕劑低密度水泥漿體系常規(guī)性能與常規(guī)密度水泥漿體系常規(guī)性能差別不大,可以提高低密度水泥漿體系固井質(zhì)量,降低固井成本,提高水泥石抗腐蝕能力,延長(zhǎng)油氣井壽命。
[Abstract]:With the exploration and development speed, high temperature, low pressure and leakage wells increasing, low density cement slurry system is the main method to solve the formations. While the conventional low density cement slurry to reduce material: fly ash, micro silica, bentonite, slag on cement slurry density reduction ability is limited; nitrogen, ordinary pressure resistance microsphere low density cement slurry system is poor; hollow glass bead cement slurry system with high cost, can not promote the use of. To solve the above problems, a low cost compound reducing agent with pressure capacity of 60MPa has been developed, and a low density cement slurry system, which is resistant to 180 degree high temperature and 1.20g/cm3 to 1.60g/cm3 density, has been developed. Based on the actual accumulation of particles, a compact accumulation model of three grade particles and a compact accumulation model of four level uncertain particle size particles are established. From the three level particle size distribution model, the three gradation particle size ratio is 1:0.464:0.268, and the porosity measurement device of the packing system is developed, and the void fraction of the stacking system is tested. The research results show that when the first particle size, the two stage middle particle size and the three stage small particle volume ratio are 6:1:3, the three grade particle compact accumulation body is the most compact and the porosity is the smallest, 34.01%. Fine grain volume ratio of three stage particles in dense packing system is fine tuned. It is concluded that the particle size ratio of large, middle and small particles is between [7 to 10]: [1 to 2]: [2 ~ 2.5], and the void fraction of packing system is relatively small, and particles are closely packed. The theoretical model combined with experiment, developed the density range was 0.87g/cm3 ~ 1.04g/cm3, 1.01g/cm3 ~ 1.23g/cm3, the bearing capacity were 40MPa, 60MPa, application of cement slurry density in the range of 1.20g/cm3 ~ 1.60g/cm3 between JQ-1 and JQ-2 composite reducing agent, which cost less than 16 thousand and 900 yuan / ton. Through a large number of experiments, it has been proved that the compound reducing agent has good compatibility with the conventional oil well cement slurry additive and has strong resistance to high temperature. In this paper, the performance of low density cement slurry with density of 1.20g/cm3, 1.40g/cm3 and 1.60g/cm3 was studied by using the developed compound reducing agent, including pressure capacity, high temperature stability, rheology, permeability of cement paste and strength development of cement paste at high temperature. The research results show that the low density cement slurry system has good stability at high temperature, slurry on the density of less than 0.02g/cm3; good rheological properties, fluidity is greater than 19cm; API loss is small, less than 60ml; in the circulating temperature 140 to 180 DEG C conditions, adjustable thickening time is 154min ~ 527min well, the thickening curve, as a basic right angle thickening; the compressive strength of cement stone is high, the density of 1.20g/cm2, 1.40g/cm, 1.60g/cm3 three kinds of low density cement slurry system of 75 DEG C water bath pressure maintenance 2D compressive strength were 16.28MPa, 26.46MPa, 30.25MPa; study the three kinds of low density cement slurry at high temperature the performance, the compressive strength of cement stone and cement properties and temperature affected the strength of cement stone permeability performance. The results show that the conventional performance of compound reducing agent low density cement slurry system is not much different from that of conventional density cement slurry system. It can improve cementing quality of low density cement slurry system, reduce cementing cost, improve the corrosion resistance of cement paste and extend the life of oil and gas well.
【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】：2017
【分類號(hào)】：TE256

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