共查询到18条相似文献，搜索用时 203 毫秒
1.
绥中36-1-G43M井是我国海上油田首次自主实施四级完井的多底分支井,采用的是特殊设计的斜向器侧钻系统,即在主井眼中下入空心斜向器进行上分支侧钻作业,利用定向射孔技术勾通上下两个分支,生产管柱可实现分采.此项技术不仅有效解决了海上平台槽口不足的问题,同时对一些低效井的再利用提供了有效的解决措施,对提高油田采收率、降低开采成本有重要意义,在渤海油田中后期的大规模调整开发中有广阔的应用前景. 相似文献
2.
根据对涠洲11-1-A1井的油层物性、储层特征及敏感性分析，采用醇基酸作为酸化施工主处理液，这样既减少了对开发层位的损害，又保证了处理液对地层有适宜的、较高的溶蚀率，对解除钻井液和固井水泥浆造成的污染堵塞具有明显效果。经过酸液类型及浓度的确定、添加剂的筛选、流动模拟及残酸分析等室内试验研究，确定了适用于该井海上酸化的酸液配方。 相似文献
3.
南海西部油田的涠洲11-1N-A12井是一口探边注水井,该井采用威德福公司最新型的液压磨铣套管开窗工具在9-5/8＂套管内进行开窗侧钻,仅用一趟钻就实现了定向、座挂、开窗、修窗和钻进新地层14.12 m,大大节约了钻井时间。介绍了威德福公司的Hydraulic套管开窗系统的组成部件及工具的优点,分析了如何在开窗作业过程中进行钻井参数控制,总结了关于工具的送入、脱手、定向和窗口质量控制等方面的一些经验,可以为以后类似井的套管开窗作业提供技术参考。 相似文献
4.
2011年12月25日,上海海洋石油局勘探六号平台进行NB14-2-1井压裂作业,也是该平台首次压裂作业获得圆满成功。其中最重要的主压裂作业,始终将环空压力保持在2 900-3 050 psi之间,以确保LPR-N阀打开。与此同时,在分别向两个缓冲罐供液的同时,及时将泥浆池剩余胶液进行汇总, 相似文献
5.
针对渤海油田在大修井过程中出现的地层漏失严重、井下工具打捞困难、套铣进尺缓慢等问题,根据泡沫钻井的理论知识及其应用特点,研究开发了一种新型的环保型的套铣冲砂液,与传统的暂堵液相比,其黏度低、切力小、携砂能力好,润滑系数低、循环摩阻小,易于溶解,不会结块憋泵,后期不需要破胶等等.其主要配比为：0.5％BH-VIS＋3％FPJ-12＋3％XJW-1 ＋2％YS-A.它主要以微泡作为分散相,低黏胶液作为连续相,依靠泡沫承托能力强以及泡沫和生物聚合物的双层封堵的特点,达到一种良好的冲砂、降漏失效果.该技术在渤海油田得到了成功的应用,保证了大修作业的顺利进行. 相似文献
6.
海洋钻修井装置作业前检验,是海上钻修井作业过程中的重要环节。做好作业前检验工作,使作业装置满足作业和安全的要求,是后续作业顺利、安全、高效进行的重要保障。文章根据南海西部近5年来海洋钻修井装置作业前检验工作的现状,从管理、技术层面对作业前检验存在的问题进行剖析,并给出了相关建议。如：作业前检验全生命周期管理的流程及强化措施;保持验船人员的公用机制;引进、培养一支固定的验船队伍;制定验船标准化手册;增加验船技术手段等。为进一步提高海洋钻修井装置检验质量及海上钻修井作业保驾护航。 相似文献
7.
本文在假定堤前波浪不发生破碎和空间上均匀稳定条件下,讨论了直立堤前入、反射波谱的分离.给出了波浪正向和斜向入射都适用的分离公式,由堤前海浪记录计算入、反射波谱及反射系数,并讨论了该方法的有效分离范围,文中还计算分析了几组实测资料,计算结果与实测结果吻合良好,验证了本文方法的正确性。 相似文献
8.
老168-斜18井是胜利油田在桩西滩海地区钻成的一口井斜达到63．70°的大位移海油陆采井。由于造斜点浅、造斜井眼较大、造斜地层软、水平位移大、大斜度稳斜段长等，该井施工困难极大。为保证施工的顺利进行，针对钻遇地层的特点，通过制定有效轨迹控制方案，选取合理的造斜工具及钻具组合，实施合理的钻井参数及技术措施，同时进行简化钻具结构和安全管理技术措施等，顺利完成了钻井任务。从井眼轨迹精确控制、优质钻井液技术、安全钻进措施、大井斜长稳斜井段套管下入等方面介绍了该大位移井实施过程中采取的技术或措施。这些技术及措施的应用不仅避免和降低了并下事故的发生，而且施工井满足开发要求，对该区域滩海大位移海油陆采井的施工具有较高的借鉴意义。 相似文献
9.
随钻扩眼器可有效扩大下部井眼直径,对于优化井身结构、提高完井质量、提高钻进效率、降低后续作业风险具有重要意义。随钻扩眼时该工具相当于一个满眼扶正器,在直井段工作时扩眼器具有防斜作用,但在定向段随钻扩眼时该工具将改变常规造斜钻具的造斜特性,因此该工具在定向造斜段应用的可行性需要研究。以一套常用造斜钻具为例,计算了其初始造斜率以及直接扩眼工况和随钻扩眼工况的造斜率,发现使用扩眼器后对原有钻具组合的造斜特性影响很大。为达到原有造斜要求,通过单独和组合调整BHA参数（主要有螺杆钻具弯角、上稳定器外径、上稳定器距离钻头距离等）获得与原有BHA造斜特性基本相当的多种方案,这说明扩眼器可在既定的造斜要求下完成定向随钻扩眼钻进施工。 相似文献
10.
为了解南四湖支流东鱼河水质的时空分布特征,本文在2017年7月 自上游至入湖河口设定6个采样点采集上覆水,测定营养盐和重金属的浓度,并对东鱼河2008-2017年入湖河口上覆水进行水质评价.结果表明,2017年东鱼河上覆水中重金属及NO2-浓度符合目标水质标准,CODMn、TP、F-和TN均存在不同程度地污染,其中TN... 相似文献
11.
Twelve washover deposits were cored on the west-central Gulf Coast of Florida to provide data to permit development of a model to help identify washover facies in the stratigraphic record. Typical modern washover stratigraphy displays landward-dipping plane beds comprised of well-sorted sand with distinct laminae of shells and heavy minerals. Five subfacies are delineated which show variations in composition, texture, and bioturbation throughout the washover facies. These subfacies represent differences in flow conditions during overwash, position relative to sea level, and variable degrees of reworking after deposition. Three shell assemblages aid in identification of washover deposits. Backbarrier sediments composed of shoreface/open water species or mixed shoreface/backbarrier species may potentially be washover in origin. Sediments with purely backbarrier/quiet water shell species are likely to have been deposited independently of washover activity. Examination of washover deposits of differing ages reveals that preservation of washover stratigraphy is not exclusively a function of time. Reworking of small-scale stratification can occur in as short as a decade; however, this same stratification was found to be preserved in deposits several hundred years old. Destruction of original washover signatures is related to the position of the deposits relative to sea level, and the rate and depth of burial. Even after the destruction of small-scale stratigraphic features, washover deposits may still be identified as such due to their texture, composition, and shell assemblages. Key features in recognizing the facies after bioturbation and reworking are: (1) the presence of clean sand in otherwise muddy backbarrier sediments, (2) the landward thinning of the facies, and (3) the presence of shoreface shells or mixed shoreface/backbarrier shells on landward portions of the barrier island system. If reworking is severe and/or there are limited subsurface data, distinguishing washovers from genetically similar deposits (e.g. flood tidal deltas and spillover deposits) in the stratigraphic record is difficult and when considered out of stratigraphic context may not be recognizable. 相似文献
12.
Although the morphology of the barrier-inlet system along the west-central Florida coast is quite complicated, the stratigraphy of these barriers is rather simple. The basal Holocene unit in most cores is an organic-rich, muddy sand that represents a vegetated, paralic marine, coastal environment similar to that which is north and south of the present barrier system. Above that unit is a muddy, bioturbated sand that displays a marine fauna at most locations but also contains Crassostrea virginica in a few places. These sediments accumulated in a low-energy marine setting that may or may not have been protected by a barrier island. Much of this facies also represents sediment that was delivered as washover deposits in an intertidal or subtidal setting and was subsequently bioturbated. The facies that can be attributed to a barrier island with some certainty are no more than 3000 years old, and on most islands, are much younger. These are the shelly sand and sorted sand facies. The shelly strata represent deposition in nearshore, beach, supratidal washover or intertidal spillover environments, and tidal inlet and tidal delta channels, whereas the sorted sand is typical of eolian deposition in dunes or the backbeach and some tidal delta elements. The presence of Holocene oyster beds offshore of a present barrier suggests that some of these islands formed significantly offshore and moved to their present position through washover. It is likely that most of these barriers initially formed through upward shoaling by waves. Although there is significant morphologic difference between the wave-dominated and mixed-energy, drumstick barrier islands, their stratigraphy is quite similar. The only significant difference is the presence of extensive progradation on at least part of the drumstick islands and a relatively high amount of former washover deposits on the wave-dominated type. 相似文献
13.
由于海洋石油开发的特殊性,每个采油平台的槽口数量有限,而新建平台或者外挂槽口成本太高,因此利用低效井和关停井的槽口进行套管内开窗侧钻成为一种很好的选择。QHD32—6F平台部分生产井为中177．8mm生产套管,利用修井机在Ф177．8mm生产套管内开窗侧钻Ф152．4mm小井眼,直接着陆钻水平段,裸眼段最长达1120m,平均长1032m。该工艺技术可操作性较强,工期短,成本低,为延长老油田寿命,维持老油田经济开发指明了方向。 相似文献
14.
Clay balls deposited as a washover fan at Stone Harbor, New Jersey, are probably fragments of a bed of Pleistocene continental shelf clay, based on physical characteristics, clay mineralogy, and radiocarbon ages of 20,135–24,630 yr BP. They may not all originate in the same area and are probably undergoing mixing with modern organic material. 相似文献
15.
为满足恩平24-2油田水平井钻井工程和储层保护需要,通过实验研制出一种无固相快速弱凝胶钻井液体系.室内评价试验表明：该钻井液具有较高的动塑比和较高低剪切速率黏度（LSRV）,能有效克服水平井段携岩难、易形成岩屑床的问题.具有优异的抑制性和润滑性,且滤失量较小,具有较强的抗温、抗污染能力、井眼净化能力和储层保护能力.针对恩平24-2油田水平井采用裸眼完井工艺,研究了破胶剂JPC对钻井液及其滤饼的破胶性能,破胶剂JPC能有效解除聚合物对储层造成的污染.研究结果表明,该钻井液具有独特的流变性,维护简单,优异的储层保护性能和较好的可降解性,适用于恩平24-2油田水平井水平段的钻进. 相似文献
16.
A simple hand-operated device for cutting longitudinal sections of core liners has been developed at a very low cost. The liner is placed on a stand and secured properly by circular plates and tightening levers. Two high-speed steel blades situated in diametrically opposite direction are pressed tightly on the liner. By rotating a handle these blades move to cut both sides of the liner simultaneously. For cross-sectioning the core liner another simple hand-operated instrument has been illustrated. The liner is fixed in a stationary ring by tightening screws. An adjustable lever with a high-speed steel blade is fixed on a tool holder and welded to an outer ring which is rotated 180° by a handle to cut the liner. The cut portions are smooth, perfect and straight and the operation is very simple and safe. 相似文献
17.
The sedimentary record of 130 km of microtidal (0.9 m tidal range) high wave energy (1.5 m average wave height) barrier island shoreline of the Cape Lookout cuspate foreland has been evaluated through examination of 3136 m of subsurface samples from closely spaced drill holes. Holocene sedimentation and coastal evolution has been a function of five major depositional processes: (1) eustatic sea-level rise and barrier-shoreline transgression; (2) lateral tidal inlet migration and reworking of barrier island deposits; (3) shoreface sedimentation and local barrier progradation; (4) storm washover deposition with infilling of shallow lagoons; and (5) flood-tidal delta sedimentation in back-barrier environments. Twenty-five radiocarbon dates of subsurface peat and shell material from the Cape Lookout area are the basis for a late Holocene sea-level curve. From 9000 to 4000 B.P. eustatic sea level rose rapidly, resulting in landward migration of both barrier limbs of the cuspate foreland. A decline in the rate of sea-level rise since 4000 B.P. resulted in relative shoreline stabilization and deposition of contrasting coastal sedimentary sequences. The higher energy, storm-dominated northeast barrier limb (Core and Portsmouth Banks) has migrated landward producing a transgressive sequence of coarse-grained, horizontally bedded washover sands overlying burrowed to laminated back-barrier and lagoonal silty sands. Locally, ephemeral tidal inlets have reworked the transgressive barrier sequence depositing fining-upward spit platform and channel-fill sequences of cross-bedded, pebble gravel to fine sand and shell. Shoreface sedimentation along a portion of the lower energy, northwest barrier limb (Bogue Banks) has resulted in shoreline progradation and deposition of a coarsening-up sequence of burrowed to cross-bedded and laminated, fine-grained shoreface and foreshore sands. In contrast, the adjacent barrier island (Shackleford Banks) consists almost totally of inlet-fill sediments deposited by lateral tidal inlet migration. Holocene sediments in the shallow lagoons behind the barriers are 5–8 m thick fining-up sequences of interbedded burrowed, rooted and laminated flood-tidal delta, salt marsh, and washover sands, silts and clays. While barrier island sequences are generally 10 m in thickness, inlet-fill sequences may be as much as 25 m thick and comprise an average of 35% of the Holocene sedimentary deposits. Tidal inlet-fill, back-barrier (including flood-tidal delta) and shoreface deposits are the most highly preservable facies in the wave-dominated barrier-shoreline setting. In the Cape Lookout cuspate foreland, these three facies account for over 80% of the sedimentary deposits preserved beneath the barriers. Foreshore, spit platform and overwash facies account for the remaining 20%. 相似文献
18.
Coarse clastic barriers are common on mid- and high-latitude coasts. They possess a morphosedimentary and dynamic distinctiveness which sets them apart from sandy fineclastic barrier forms. The reflective nature of the seaward barrier favors the development of zero mode, sub-harmonic edge waves particularly during long period swells (10–20 s), manifest in the formation of high level cusps. In some circumstances the pattern of recent overwashing of the barrier is related to cusps. Lack of distinct tidal passes, due partly to the high seepage potential of coarse barriers, means that very little sediment is transported seaward. Thus the barriers roll steadily onshore, and sections show a variety of washover facies, related to the volume of overwash surges. 相似文献
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