现场用两种地面交联酸性能的室内评价

Properties Evaluation of Two Surface Crosslinked Acids Used in Oilfield

室内评价了两种地面交联酸在不同交联比、120℃和170 s-1的耐温耐剪切性,常温和90℃时的携砂性以及90℃下的破胶特性。配方的一基酸由20%HCl+0.8%～1.2%稠化剂DMJ-130A+2.5%缓蚀剂DJ-04+0.5%助排剂DJ-02+1.2%铁离子稳定剂DJ-07+0.5%破乳剂DJ-10组成,交联剂为有机金属化合物DMJ-130B;配方二的基酸由20%HCl+0.6%～1.0%高分子聚合物FA-214+2.5%DJ-04+0.5%DJ-02+1.2%DJ-07+0.5%DJ-10组成,交联剂为有机金属化合物AC-14。配方一在交联比为100∶0.8时的黏度基本在100～250 mPa·s之间,剪切50 min后大于200 mPa·s;交联比为100∶1.0时,黏度基本在80～170 mPa·s之间,剪切37 min后的黏度约100 mPa·s。配方二在交联比为100∶1.0时,剪切20 min后的黏度为40～57 mPa·s;在交联比为100∶1.3时的初期黏度变化较大,剪切15 min后,从600 mPa·s急剧下降并维持在60 mPa·s左右。陶粒在两种地面交联酸和常规瓜尔胶交联液中的沉降速率接近,为2.4×10-3～3.8×10-3mm/s。两种地面交联酸与碳酸盐岩岩心在90℃反应4 h后,地面交联酸均可完全破胶,配方二稍快一些。配方一较配方二具有更好的携砂能力和减缓H+传递、增大活性酸有效穿透距离及裂缝扫油面积的性能。

The anti-temperature and anti-shear properties of two surface cross-linked acids under different crosslink ratios, 120℃ and 170 s-1, the slurring sand capacities at room temperature and 90℃, and the gel-breaking features at 90℃ were studied in laboratory. There were two formula of acids, one （formula Ⅰ ） was： 20% HCl＋0.8%-1.2% DMJ-130A （thickener）＋2.5% DJ-04 （corrosion inhibitor）＋ 0.5% D J-02 （cleanup additive）＋ 1.2% D J-07 （ferric ion stabilizer）＋0.5% DJ-10 （demulsifier） , with DMJ-130B crosslinking agent made from organometallic compounds, the other （formula lI ） was： 20% HCl＋0.6%--1.0% FA-214（polymer） ＋2.5% DJ-04＋0.5% DJ-02 ＋ 1.2% DJ-07 ＋0.5% DJ-10, with AC-14 crosslinking agent made from organometallic compounds. The viscosity of formula I was within 100--250 mPa. s, and kept 200 mPa. s above after shearing 50 min when the crosslink ratio was 100： 0.8. And that was within 80--170 mPa. s, and kept about 100 mPa. s after shearing 37 min when the crosslink ratio was 100：1.0. The viscosity of formula Ⅱ was within 40--57 mPa. s after shearing 20 min when the crosslink ratio was 100：1.0. And that changed in the period of beginning, and decreased sharply from 600 mPa. s to 60 mPa. s after sheafing 15 min when the crosslink ratio was 100： 1.3. The sedimentation rate of proppant haycite in two surface cross-linked acids and a regular guar cross-linked fluid was similar, the value was in the range of 2.4× 10^-3--3.8 × 10^-3 mm/s. Gel-breaking for the two surface cross-linked acids fulfilled completely under 90℃ after reaction 4 hrs with carbonate rock core, and formula Ⅱ was earlier than formula Ⅰ. Formula Ⅰ had better slurring sand capacity, retarding H＋ transport capacity, improving distance of active acid flow, and enlarging swept area of fracture than formula Ⅱ.