井塌

该体系在该区3口井中应用，表现出极强的抑制效果，密度低、钻速快，有效地防止了井塌，保护了气层，实现了钻井液与完井液的统一。

The application of this system in 3 wells shows its good inhibiting effect , low density and high drilling rate . And this is helpful for the unity of well completion fluid with drilling fluid to prevent well slough and protect gas zone .

地层不稳定，井塌严重。

The formation is unstable and the well caving are serve .

对大港油田钻井过程中井塌问题的探讨

On Cave - in problems in the Dagang oil field

辽河断陷泥页岩水敏性井塌问题研究

A Study of Well Collapse Caused by Water Sensitivity of Mud and Shale Faulted Depression

现场使用的硅胺聚合物钻井液体系，可满足上部地层钻井施工要求，但在下部施工过程中井壁不稳定现象较严重，常发生井壁掉块、起下钻遇阻、甚至井塌等井下复杂事故。

Silicon amine polymer drilling fluid system presently used in field can satisfy generally drilling requirements of shallow formation but often causes the above serious accidents in deep formation .

新疆塔河油田三叠系、石炭系地层长期以来存在着严重井塌问题，为此，用实验方法优选出高效防塌钻井液配方，并对其性能进行了研究。

The formulations of a kind of high-performance collapse-preventing drilling fluid for preventing the instability of well bore in the Triassic and Carbonic formations of Tahe Oilfield in Xinjiang area were experimentally optimized .

它不仅会延误钻井作业时间，延长钻井周期，耗费大量堵漏材料，还会引起卡钻、井喷、井塌等一系列复杂情况。

It not only delay the time of drilling 、 extend drilling period 、 spend a lot of lost circulation material , but also cause a series of accident such as sticking 、 well spout 、 collapse .

河流相地层测井声阻抗受钻井泥浆的影响较大，在水基泥浆条件下，由于含泥质地层的蚀变以及井眼跨塌，往往导致测井波阻抗反演时的不匹配或假象。

Logging acoustic impedances of fluvial strata are largely influenced by drilling mud . Under the condition of using water-base mud , alteration of argillaceous strata and borehole collapse can often lead to mismatch or pseudomorph in inversion of logging acoustic impedance .

为解释直径很大的塌井，提出组合塌井概念。

For explanation of the col-lapse well with large calibre , a concept of combined collapse well is presented .

该气田地层裂缝发育，钻井过程中井漏和井塌问题非常严重，钻井作业十分困难。

Very severe problems during drilling were circulation loss and borehole collapse because of formation fracture growing , and drilling operation was very difficult .

二连油田阿南区块，由于长期注水，油气层出现明显的异常高压，地层原始压力遭到破坏，造成了井涌、井塌、井漏等复杂事故。

Abnormal high pressure systems have formed in Anan Block of Erlian oilfield due to long time of water flooding , kicks , lost circulation and hole collapse are frequently encountered .

在φ215.9mm井眼采用物理封堵为主、化学抑制为辅的措施，防止井塌和井径扩大，取得了良好的效果。

And in the φ 215.9 mm hole , " physical plugging " aided with " chemical inhibition " measures was taken to stop hole collapse and hole enlargement . All measures were verified to be successful .

玉门青2-7井一开井段砾石层成岩性差，胶结疏松，易引起井漏、井塌、沉砂；

In well Yumen Qing 2-7 , due to the poor diagenetic grade and weak bonding , circulation lost , hole sloughing and sand setting are frequently encountered in gravel bed in the surface section ( 444 . 5 mm );

6口井应用结果表明，有机硅钻井液具有很强的抑制能力和携岩能力，能有效地防止井塌和缩径，完全满足该地区钻井工程和测井作业要求。

Applications in 6 wells show the organic sillicon drilling fluid had good inhibition and solid carrying capacity , can prevent hole sloughing and hole diameter reduction effectively . The fluid system can meet the requirements of drilling and logging in this area .

管柱在充有钻井液的井内运动时会引起波动压力，将使井内压力系统失去平衡而引起井喷、井漏、井塌或卡钻等井下复杂情况和事故。

The motion of drill string in a well filled with drilling fluid will cause undulating pressure , which will make the pressure system in the well loss balance , causing downhole complication and accident such as blowout , lost circulation , borehole wall sloughing and sticking etc.