双6区块定向水平井防漏堵漏钻井液研究

发布时间：2018-04-20 21:06

  本文选题：双6区块 + 承压堵漏　； 参考：《东北石油大学》2017年硕士论文

【摘要】：井漏是一个困扰钻井速度提升的重要问题,不但会造成损失大量钻井液,造成成本增加,而且会造成卡钻、井喷等一系列严重的井下事故。井漏对钻井危害极大,如何处理井漏是国内外钻井行业重视的问题。导致井漏的原因很多,制约井漏处理的原因也很多,如何针对不同的井漏发生因素采用合理的办法就成为了石油技术需要解决的技术难题。双6区块位于辽河断陷西部凹陷双台子断裂背斜带,双台子油田中部。该区块东部断陷盆地形成复杂破碎的断块构造,加上储层复杂多变的陆相河流相沉积,地质条件复杂,在钻井施工中易出现井漏。本文针对双6区块井漏发生的原因进行分析,改善现有的钻井液体系并寻找合适的配比随钻堵漏剂来进行钻进过程中的防漏工作。经过实验发现在现有的钻井液中加入4%膨润土+1%单项封堵剂+2%复合堵漏剂+1%的超细碳酸钙组成的随钻堵漏剂就能够有效封堵渗漏及微裂缝地层,保证钻井顺利施工。针对双6区块储气库技术套管固井过程中出现井漏导致固井质量不合格的问题,提出适合双6区块的承压堵漏配方:原浆+5%的随钻堵漏配方+2%低渗透封堵剂BST-Ⅱ+2%棉籽壳+3%细颗粒核桃壳,采用桥接堵漏填充地层,提高地层周向诱导应力及在井壁形成致密泥饼的方法来提高地层承压能力,该承压堵漏技术在双6区块已经得到应用,将以往的10天承压工艺缩短到5天以内,提高了堵漏效率,满足固井施工对地层承压能力的要求。
[Abstract]:Well leakage is an important problem to improve drilling speed. It will not only cause loss of a large amount of drilling fluid and increase the cost, but also lead to a series of serious downhole accidents such as drilling jam, blowout and so on. Well leakage is very harmful to drilling. How to deal with well leakage is an important problem in drilling industry at home and abroad. There are many reasons leading to well leakage and many reasons restricting the treatment of well leakage. How to adopt reasonable methods to deal with different factors of well leakage has become a technical problem that needs to be solved by petroleum technology. Block Shuang 6 is located in the Shuangtaizi fault anticline zone in the western depression of Liaohe fault depression and in the middle of Shuangtaizi Oilfield. In the eastern fault basin of this block, complicated fault-block structure is formed, coupled with the complicated continental fluvial facies deposition of reservoir, the geological conditions are complicated, and well leakage is easy to occur in drilling construction. In this paper, the causes of well leakage in Shuang 6 Block are analyzed, the existing drilling fluid system is improved and the appropriate proportion of plugging agent while drilling is found to prevent leakage during drilling. It is found by experiments that adding 4% bentonite 1% single plugging agent 2% compound plugging agent 1% superfine calcium carbonate plugging agent to the existing drilling fluid can effectively seal the leakage and microfracture formation and ensure the smooth drilling operation. In view of the failure of casing during casing cementing in Shuang6 Block, the cementing quality is not up to standard. The pressure plugging formula suitable for Shuang 6 block is put forward. The 2% low permeability plugging agent BST- 鈪，

本文编号：1779436