川西地区油基钻井液井壁强化技术

王星媛, 陆灯云, 袁志平

王星媛, 陆灯云, 袁志平. 川西地区油基钻井液井壁强化技术[J]. 石油钻探技术, 2021, 49(1): 34-40. DOI: 10.11911/syztjs.2020116
引用本文: 王星媛, 陆灯云, 袁志平. 川西地区油基钻井液井壁强化技术[J]. 石油钻探技术, 2021, 49(1): 34-40. DOI: 10.11911/syztjs.2020116
WANG Xingyuan, LU Dengyun, YUAN Zhiping. Borehole Strengthening Technology with Oil-Based Drilling Fluid in the Western Sichuan Basin[J]. Petroleum Drilling Techniques, 2021, 49(1): 34-40. DOI: 10.11911/syztjs.2020116
Citation: WANG Xingyuan, LU Dengyun, YUAN Zhiping. Borehole Strengthening Technology with Oil-Based Drilling Fluid in the Western Sichuan Basin[J]. Petroleum Drilling Techniques, 2021, 49(1): 34-40. DOI: 10.11911/syztjs.2020116

川西地区油基钻井液井壁强化技术

基金项目: 国家科技重大专项“四川盆地大型碳酸盐岩气田开发示范工程”(编号:2016ZX05052)、川庆钻探工程有限公司钻采工程技术研究院科技项目“220 ℃抗高温高密度油基钻井液技术研究与应用”(编号:ZCY-19-01)联合资助
详细信息
    作者简介:

    王星媛(1989—),女,四川南充人,2011年毕业于西南石油大学应用化学专业,2014年获西南石油大学化学工程专业硕士学位,工程师,主要从事钻井液与完井液方面的技术研究工作。E-mail:wangxy_zcy@cnpc.com.cn

  • 中图分类号: TE254+.4

Borehole Strengthening Technology with Oil-Based Drilling Fluid in the Western Sichuan Basin

  • 摘要: 钻进川西地区深部地层时,井漏、井眼垮塌和卡钻问题频发,如采用油基钻井液钻进,则不易形成厚滤饼且滤饼致密性差,井筒压力穿透能力强。针对该问题,根据钻井液成膜机理,采用核壳结构设计,以苯乙烯、丙烯酸酯类等为原料,合成了一种适用于该地区深井钻井中地层温度≤150 ℃中部层位的致密膜护壁剂CQ-NFF;根据风险地层的地质特性、工程特性分析结果和d90规则,选用超细碳酸钙、弹性石墨、高强度树脂和高分散纤维复配形成了内充填封堵剂。采用扫描电镜分析了钻井液的成膜机理及形貌,通过高温高压滤失、高温渗透失水、高温渗透失油试验评价了钻井液的成膜效应,通过高温高压砂床滤失试验评价了充填材料的承压封堵能力。结果表明,CQ-NFF可在油包水乳状液和油基钻井液中形成致密薄膜,并有效吸附在滤饼表面,薄膜承压封堵能力达到2.0 MPa;将内填充封堵剂加入油基钻井液后,内滤饼的承压能力可提高至3.5 MPa以上。以上述处理剂为核心的川西地区油基钻井液井壁强化技术,在双探6井和中江2井进行了现场试验,深层井漏、井眼垮塌、卡钻等井下故障时间大幅缩短,试验效果显著。
    Abstract: Wellbore collapse, lost circulation and sticking frequently happen in deep formations when drilling in the western Sichuan Basin. When drilling with oil-based drilling fluids, it is difficult for a thick filter cake to form. Plus, the low density of the filter cake leads to high pressure penetration ability at the wellbore. To solve this problem, based on the mechanism of drilling fluid film forming, a wellbore protection agent with the compact film, CQ-NFF, was synthesized from styrene, acrylate and other raw materials using the core-shell structural design, which is suitable for the middle layer with a temperature no more than 150 °C in deep well drilling in the area. According to the analysis results of the geological characteristics and engineering characteristics of high-risk formations and the d90 rule, an inner-filling plugging agent was formed from ultra-fine grains of calcium carbonate, elastic graphite, high strength resin and highly dispersed fiber. The film-forming mechanism and morphology of drilling fluid were analyzed by scanning electron microscope (SEM). Film forming effects were evaluated in filtration tests under high temperature and high pressure along with water and oil loss tests during drilling penetration at high temperature. By means of the sand bed filtration experiments under high temperature and high pressure, the plugging capacity of the filling material was evaluated. Experimental results show that CQ-NFF can form a compact film in water-in-oil emulsion and oil-based drilling fluid, and the film can be adsorbed on the surface of the filter cake effectively. The pressure resisting and plugging capacity of the film can reach 2.0 MPa. After the inner-filling plugging agent was added to the oil-based drilling fluid, the pressure bearing capacity of the inner filter cake was increased to over 3.5 MPa. The borehole strengthening technology with oil-based drilling fluid, treating chemicals as the core, was applied in Well Shuangtan 6 and Well Zhongjiang 2. The results show a remarkable application effect that the downhole downtime due to lost circulation in deep formations, wellbore collapse or drill pipe sticking were greatly reduced.
  • 顺北油气田属于超深超高温断控型储集体,储层沿多条断裂带分布[1]。目前勘探开发的1号、4号、5号和8号断裂带二叠系发育大段火成岩,二叠系长裸眼井段固井漏失率接近100%,导致环空水泥填充率严重不足,套损问题频发[2-4],修井损失达千万元。为防止固井漏失,前期采取了多种固井浆体防漏和固井防漏技术措施,如采用Sealbond堵漏隔离液、温敏型堵漏隔离液等进行隔离液防漏,采用温敏防漏堵漏水泥浆、纤维堵漏水泥浆等进行防漏[5-7],采用密度1.20~1.40 kg/L的高强度低密度水泥浆进行双级固井防漏[8-12],采用密度1.18 kg/L的泡沫水泥浆进行单级固井防漏[13-14],以及采用正注反挤固井等防漏技术措施[15-16],但以上技术措施均无法完全解决漏失难题。

    根据上述分析,决定采用工具防漏。经过技术攻关,研制了具有环空封隔能力的封隔式分级箍,其在实现双级固井的同时还可以封隔漏层,在顺北油气田9口井进行了应用,防漏效果显著。

    顺北油气田储层埋深7 200~8 800 m,各断裂带地质条件差异大,二叠系埋深3 300~5 500 m,多为杂乱相,并含有厚度达350~500 m的大段火山岩,漏失风险极高。

    1)二叠系承压不明确。钻井期间漏失严重[17-18],固井前无法建立循环或持续漏失,难以明确地层承压能力。

    2)长裸眼固井防漏难度大。为满足完井要求,顺北油气田超深井多采用长裸眼井身结构,裸眼段长度超过4 000 m,环空摩阻高,而且,同时封隔多个压力体系,防漏难度大。

    3)常规固井防漏技术措施效果差。前期从前置液、水泥浆体系和固井工艺等多方面进行固井防漏,但固井时漏失量仍达300~900 m3;井口挤水泥进行补救后,环空水泥缺失长度仍超过2 000 m。

    常规双级固井时,由于一级固井大量漏失或失返性漏失导致漏层无法封固,会造成二级固井时继续漏失。因此,在分级箍底部设计封隔器,不仅可以实现双级固井,还可以在一级固井结束后胀封封隔器,彻底封隔漏层,防止二级固井时继续漏失,提高水泥环完整性。同时,封隔器胀封后具有一定的环空封隔能力,并在分级箍循环孔关闭后能够保证管内密封能力不低于套管抗内压强度,提高套管柱完整性(见图1)。

    图  1  固井防漏示意
    Figure  1.  Anti-leakage in cementing

    通过对比国外相关产品的特点[19-22],研制了封隔式分级箍[23],其主要包括分级箍单元、连接阀单元和水力扩张封隔器单元(见图2)。

    图  2  封隔式分级箍结构
    1.关闭塞座;2.分级箍本体;3.关闭套;4.循环孔;5.打开塞座;6.注液通道;7.开启阀;8.单向阀;9.关闭阀;10.基管;11.胶筒;12.封隔器单元;13.连接阀单元;14.分级箍单元
    Figure  2.  Stage cementing collar with packer

    封隔式分级箍主要具有以下技术特点:

    1)分级箍单元下部添加封隔器的注液通道,注液通道采用机械方式开启和关闭。一级固井结束后投入重力塞,重力塞到达打开塞座后加压开启封隔器注液通道;小排量阶梯式加压,稳压2~3次,直至封隔器完全胀封后关闭注液通道;再继续加压,可以打开分级箍循环孔。为防止循环孔提前打开和关闭,设计分级箍循环孔打开压力大于封隔器开启和关闭压力。

    2)连接阀单元设置3个控制阀。开启阀设计为压力触发,是封隔器注液通道的第二道保险;单向阀可保证注液单向流动,不回流;关闭阀设计为压力触发,当封隔器内部压力达到设定值时关闭注液通道,永久密封内部液体,保证继续加压可打开分级箍循环孔。

    3)封隔器单元由基管和胶筒组成。为保证胶筒胀封后拥有足够的环空封隔能力和更有效地贴合井眼,胶筒内部设计采用非连续式金属片进行支撑;胶筒两端固定,保证下入安全。

    根据顺北油气田生产的需要,研制了ϕ177.8~ϕ273.1 mm多种规格的封隔式分级箍,主要性能参数见表1

    表  1  不同规格封隔式分级箍主要性能参数
    Table  1.  Main performance parameters for stage cementing collar with packer of different specifications
    套管直径/
    mm
    整机密封
    能力/MPa
    封隔器注液
    打开压力/MPa
    封隔器注液
    关闭压力/MPa
    循环孔打开
    压力/MPa
    循环孔关闭
    压力/MPa
    环空封隔
    能力/MPa
    管内密封
    能力/MPa
    胶筒长度/
    mm
    本体最大
    外径/mm
    本体内径/
    mm
    177.8357.0±0.513.0±0.515.0±0.55.0±0.520801200210156
    193.7357.0±0.513.0±0.515.0±0.55.0±0.520751200230168
    244.5357.0±0.511.0±0.514.0±0.55.0±0.535651200290220
    273.1357.0±0.511.0±0.514.0±0.55.0±0.535501200312244
    下载: 导出CSV 
    | 显示表格

    下面以ϕ193.7 mm封隔式分级箍为例,进行整机组装后的室内性能评价试验。

    封隔式分级箍整机组装后上部连接ϕ193.7 mm短套管,短套管顶部连接上试压封头,封隔式分级箍下部连接下试压封头,使用4DSY-22/63型电动试压泵对其进行试压,验证封隔式分级箍的整机密封能力。整机加压至35.5 MPa(设计35.0 MPa),稳压15 min后压力稳定无下降(见图3),表明其密封性能良好。

    图  3  整机密封压力试验结果
    Figure  3.  Results of sealing pressure test for the whole machine

    整机密封试验结束后,拆卸下试压封头,将封隔式分级箍放入试验井眼内,并连接限位接头;拆卸上试压封头,投入重力塞,重新连接上试压封头;使用电动试压泵进行加压,将重力塞泵送至打开塞座后,加压至6.2 MPa(设计7.0 MPa),此时压力瞬间下降,表明封隔器注液通道已开启;继续加压至6.9 MPa时封隔器开启阀打开,开始注液;注液期间稳压3~4 min后,压力继续阶梯式缓慢上升,当压力升至16.0 MPa(设计15.0 MPa)时触发封隔器关闭阀,注液通道关闭(见图4),封隔器胀封完毕。

    图  4  封隔器胀封压力试验结果
    Figure  4.  Pressure test results of packer expansion

    封隔器胀封完毕后,连接封隔式分级箍与模拟井眼环空试压口,进行封隔器环空封隔能力试验。模拟井眼设置为ϕ250.8 mm井眼,井径扩大率10%。使用电动试压泵对环空进行多次加压、稳压,最高加压至43.8 MPa(设计20.0 MPa),环空封隔效果仍良好,无渗漏(见图5)。

    图  5  封隔器环空封隔压力试验结果
    Figure  5.  Annular sealing pressure test results of packer

    封隔器环空封隔能力试验结束后,重新连接ϕ193.7 mm短套管的上试压封头,使用电动试压泵对封隔式分级箍内部加压,加压至18.2 MPa(设计15.0 MPa)时压力瞬间下降,表明分级箍循环孔打开(见图6)。拆卸上试压封头,投入关闭塞,重新连接上试压封头;继续加压,将关闭塞泵送至关闭塞座后,加压至6.2 MPa(设计5.0 MPa)时,分级箍循环孔关闭。

    图  6  分级箍循环孔打开压力试验结果
    Figure  6.  Opening pressure test results of circulation holes of stage cementing collar

    分级箍循环孔关闭后,连接下部盲板,加压至75.1 MPa(ϕ193.7 mm套管抗内压74.9 MPa),稳压15 min,无压降、无渗漏,表明封隔式分级箍的循环孔关闭后管内密封良好(见图7)。

    图  7  分级箍管内密封压力试验结果
    Figure  7.  Internal sealing pressure test results of stage cementing collar

    顺北油气田9口井应用封隔式分级箍进行了固井施工,井下操作安全可靠,二级固井的平均漏失量由105.1 m3降至3.4 m3,环空水泥平均缺失长度由2 048 m缩短至约350 m,节省漏失和挤水泥补救费用约1 100万元,具体应用情况见表2。下面以SHBF-O9H井为例分析其应用效果。

    表  2  封隔式分级箍在顺北油气田的应用情况统计
    Table  2.  Application of stage cementing collar with packer in the Shunbei Oil & Gas Field
    年份井号二叠系井段/m套管直径/mm封隔式分级箍位置/m一级固井漏失量/m3二级固井漏失量/m3水泥环缺失长度/m
    2021SHBX-2YH3 702~4 261273.13 644.90366.50265
    2021顺北Z4X3 886~4 384193.73 651.40 00710
    2021SHBX-8H4 370~5 034273.14 356.10474.00305
    2021顺北EY2X3 458~4 030193.73 400.00374.5 23.3700
    2022SHBF-O9H4 592~5 154244.53 685.70280.00390
    2022SHBZ-O2H3 644~4 162273.13 381.20437.90370
    2022SHBE-X3H3 415~3 983273.13 008.70399.20100
    2022顺北E10X3 264~3 812273.13 013.30395.00 0
    2022顺北T1X4 104~4 711273.14 078.80265.1 6.9140
    下载: 导出CSV 
    | 显示表格

    SHBF-O9H井是一口四级井身结构井,钻进二叠系(4 592~5 154 m井段)期间漏失密度1.25 kg/L的钻井液305.7 m3,中完井深5 210.00 m,采用ϕ244.5 mm套管进行双级固井。根据井径情况,将封隔式分级箍安装在二叠系以浅且井径较规则的井深3 685.70 m处;下套管期间漏失钻井液98.0 m3,固井前持续漏失。

    一级固井领浆采用密度1.25 kg/L的低密度水泥浆,尾浆采用密度1.88 kg/L的常规水泥浆,固井漏失量280.0 m3。替浆结束后投入重力塞,重力塞下行到预定位置后,加压胀封封隔器,加压至6.8 MPa时开始注液,继续阶梯式加压,压力由6.8 MPa逐步提高至8.0,10.0和11.4 MPa,每次稳压3~5 min,压降0~0.1 MPa;加压至12.0 MPa时触发封隔器关闭阀,胀封作业结束;继续加压至14.3 MPa时压力瞬间下降,顺利打开循环孔,成功建立循环。候凝24 h,期间每隔1 h顶通一次,无漏失,初步验证封隔式分级箍已封隔漏层。

    二级固井领浆采用密度1.90 kg/L的常规水泥浆,尾浆采用密度1.60 kg/L的低密度水泥浆,替浆到量碰压,压力由7.0 MPa瞬间升至14.8 MPa,循环孔关闭,稳压5 min无回流;水泥浆返出地面,二级固井无漏失。该井环空水泥环充填率约为93.0%,封隔式分级箍两侧的固井声幅质量差异较大,分级箍以上井段胶结质量优质,分级箍以下井段存在215 m长的环空自由段,表明封隔式分级箍成功封隔下部漏层,降低了二级固井漏失风险。

    1)根据顺北油气田生产需求,研制了不同规格的封隔式分级箍,室内试验表明,该分级箍能够实现封隔式胀封和分级箍循环孔的打开与关闭,环空封隔能力和管内密封能力满足防漏固井要求。

    2)封隔式分级箍已在顺北油气田应用9口井,井下操作安全,可靠性高,降低了二级固井漏失量,提高了环空水泥环充填率,完全满足顺北油气田长裸眼防漏固井需求。

    3)封隔式分级箍可在固井时封隔漏层,降低固井漏失风险,保证二级固井水泥浆返高,对长裸眼易漏失地层固井有较强的适用性。

  • 图  1   CQ-NFF的分子结构式

    Figure  1.   Molecular structure of CQ-NFF

    图  2   CQ-NFF颗粒粒径分布

    Figure  2.   Particle size distribution of CQ-NFF

    图  3   CQ-NFF在油包水乳状液中所形成膜的微观结构

    Figure  3.   Microstructure of the film formed by CQ-NFF in water-in-oil emulsion

    图  4   CQ-NFF在油基钻井液滤饼上的成膜效应

    Figure  4.   Film-forming effect of CQ-NFF on oil-based drilling fluid filter cake

    图  5   内充填封堵剂颗粒粒径分布

    Figure  5.   Particle size distribution of inner-filling plugging agent

    图  6   双探6井ϕ241.3和ϕ149.2 mm井段与邻井钻井数据对比

    Figure  6.   Comparison of drilling data of ϕ 241.3 mm and ϕ 149.2 mm sections in Well Shuangtan 6 and adjacent wells

    表  1   CQ-NFF在油包水乳状液中的成膜封堵效应评价结果

    Table  1   Evaluation results of the film-forming plugging effect of CQ-NFF in water-in-oil emulsion

    CQ-NFF加量,%高温高压
    滤失量/mL
    高温渗透
    失油量/mL
    高温渗透
    失水量/mL
    高温渗透失油最大
    承压能力/MPa
    高温渗透失水最大
    承压能力/MPa
    0 击穿击穿击穿0.5 MPa击穿0.5 MPa击穿
    1.05.5击穿击穿0.50.5 MPa击穿
    2.02.028.4击穿1.50.5
    3.02.413.627.01.50.5
    4.00.5 8.219.22.01.0
    下载: 导出CSV

    表  2   CQ-NFF对油基钻井液基本性能的影响

    Table  2   The effect of CQ-NFF on basic properties of oil-based drilling fluid

    CQ-NFF加量,%表观黏度/
    (mPa·s)
    塑性黏度/
    (mPa·s)
    动切力/
    Pa
    静切力/Pa破乳电压/
    V
    高温高压
    滤失量/ mL
    滤饼厚度/
    mm
    高温渗透
    失水量/mL
    高温渗透
    失油量/mL
    初切终切
    0 706553.0 8.01 4187.01.5击穿击穿
    1.0756693.510.51 4670.21.537.44.6
    2.0938211 5.515.51 4170.21.528.23.4
    下载: 导出CSV

    表  3   内充填封堵剂对油基钻井液流变性的影响

    Table  3   Effect of inner-filling plugging agent on rheological properties of oil-based drilling fluid

    内充填封堵剂表观黏度/
    (mPa·s)
    塑性黏度/
    (mPa·s)
    动切力/Pa六速黏度计读数静切力/Pa破乳电压/V
    Φ6Φ3初切终切
    未加入60.054 6.0 5 43.5 7.0918
    加入95.58015.511107.016.5987
     注:内充填封堵剂的具体配方为3.0%400目超细碳酸钙+2.0%弹性石墨+1.0%高强度树脂+0.1%高分散纤维。下同。
    下载: 导出CSV

    表  4   内充填封堵剂承压封堵能力评价结果

    Table  4   Evaluation results of the pressure resisting and plugging capacity of the inner-filling plugging agent

    内充填封堵剂砂床滤失量/mL砂床强化后清水承压能力/MPa砂床强化后白油承压能力/MPa
    未加入14.8 0.5 0.5
    加入0 ≥3.5 ≥3.5
    下载: 导出CSV

    表  5   中江2井与川西火山岩层钻井故障情况对比

    Table  5   Comparison of the drilling failures of Well Zhongjiang 2 and volcanic layers in western Sichuan Basin

    井名火山岩岩性井下故障类型井下故障时间/h井下故障时间占比(同开次),%
    大深001-X1井凝灰岩、杏仁状玄武岩垮塌、卡钻导致侧钻1 034.9923.25
    大深001-X3井凝灰岩、杏仁状玄武岩垮塌、卡钻导致侧钻1 077.2538.69
    大深001-X4井凝灰岩、杏仁状玄武岩垮塌 239.5915.03
    莲探1井凝灰岩、杏仁状玄武岩垮塌、卡钻导致侧钻6 044.8590.93
    永探1井凝灰岩、灰绿岩、杏仁状玄武岩井漏、垮塌 80.48 2.73
    中江2井凝灰岩、杏仁状玄武岩 00
    下载: 导出CSV
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  • 收稿日期:  2020-04-06
  • 修回日期:  2020-08-15
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  • 刊出日期:  2021-01-29

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