聚丙烯酰胺类交联酸已广泛应用于高温深井地层酸压改造中，提高其破胶效率有利于降低地层伤害和提高增产效果。通过室内试验分析了交联酸中酸的加量、温度以及破胶剂加量对交联酸破胶效果的影响，利用螯合剂络合金属离子方法，对交联酸破胶效果进行了优化。结果表明，当温度小于60℃、酸的加量大于15％时，交联酸的黏度大于400mPa·s，不发生破胶；当交联酸中酸的加量为20％时，过硫酸铵加量由0.1％增至0.6％对破胶效果影响不大；温度为90℃时，交联酸的黏度在10min后降至5mPa·s，残渣含量1470mg/L，破胶不均匀。对比不同破胶方式下的破胶效果可知，交联酸中加入0.1％EDTA和0.1％胶囊破胶剂，60min后其黏度降至8mPa·s，残渣含量387mg/L，破胶效果好。这表明，应用胶囊破胶剂和EDTA（螯合剂）的组合破胶方式，可延缓破胶剂有效成分的释放速度和降低交联酸的黏度，达到改善交联酸破胶效果的目的。

Polyacrylamide crosslinked acid has been widely used in the acid fracturing in deep high tem-perture wells .The gel-breaking is to reduce the strata damage and to improve the effects of stimulation . Through laboratory tests ,acid amount ,temperature and gel breaker amount were analyzed for their effects on crosslinked acid gel breaking .Using the method of complexing metal ion in chelating agent ,the crosslinked acid gel breaking effect was optimized .The results showed that no gel breaking occurred when temperature was less than 60 ℃ ,the acid amount was greater than 15% ,and crosslinked acid viscosity was higher than 400 mPa · s ;gel-breaking performance was not affected significantly when the acid amount was 20% and the mass fraction of ammonium persulfate increased from 0.1% to 0.6% ,gel-breaking was une-ven when the temperature was 90 ℃ ,crosslinked acid viscosity dropped to 5 mPa · s after 10 min ,and the resi-due content was 1 ,470 mg/L .It indicated that the visc

针对70,℃储层，采用水溶性较好、残渣含量较少的超级胍胶作为胍胶压裂液的稠化剂，选用交联效果较好的有机硼交联剂以及其他添加剂作为压裂用压裂液体系。压裂液除具备携砂等基本性能外，还具备快速破胶易返排的特点。通过对破胶剂破胶机理的分析，和对压裂液破胶、携砂性能的综合评价，得到最佳破胶剂加量范围，实现压裂作业完成后压裂液快速破胶返排，减少对地层伤害的目的。

Aiming at the 70,℃reservoir,a super guanidine gum with excellent water-solubility and less residue con-tent was taken as the fracturing fluid viscosifier. An organic boron crosslinking agent with good cross-linking effect and other additives were taken as the fracturing fluid system. Fracturing fluid should have the characteristics of fast gel breaking and high flowback except the basic performance of sand carrying. Through the analysis of the gel breaking mechanism of the gel breaker,and a comprehensive assessment of the fracturing fluid’s gel breaking and sand carry-ing performances,this study obtained the best added amount range for the gel breaker. Accordingly,the fracturing process will be achieved by accelerating the fracturing fluid’s gel breaking flowback and reducing the formation dam-age.

采用电解质Na3PO4溶液诱导阴离子表面活性剂油酸钠（NaOA）形成蠕虫状胶束体系。利用冷冻断裂蚀刻透射电子显微镜技术（FF-TEM）和流变学方法，研究了Na3PO4在不同质量分数条件下诱导NaOA形成胶束体系的微观结构、流变特性、破胶行为以及重复利用等性能。通过对体系动态模量、剪切黏度、复合黏度等物理量的测量分析，发现该胶束体系在较宽的频率范围内呈现蠕虫状网状结构和优良的黏弹性能。通过内相破胶剂研究了该体系的破胶行为，并结合流变特性测试，证实了该胶束体系具有重复利用的可行性。与目前已成熟应用的羟丙基瓜胶（HPG）压裂液冻胶及其破胶液微观 FF-TEM对比分析显示， NaOA/Na3PO4黏弹性胶束体系具有清晰的网状结构，在温和条件下能够实现和 HPG经强氧化破胶后相当的破胶效果。上述结果表明NaOA/Na3PO4黏弹性胶束体系能够作为可重复利用清洁压裂液体系，应用前景广阔。

The electrolyte Na3PO4 solution is used to induce anionic surfactant NaOA to form wormlike micelle system. By using freeze-fracture transmission electron microscopy (FF-TEM) technology and rheology method, the research about Na3PO4 which induces NaOA to form micelle system under different mass fractions, was conducted on the functions like microstructure, rheological proper-ties, gel breaking behavior and recycling. By measuring and analysis of physical quantities about dynamic modulus, shear viscosity, compound viscosity, etc. of the system, it was found that this micelle system shows wormlike net structure and good viscoelastic per-formance in a broad frequency. Using gel breakers, the gel breaking behavior of the system was studied, and combined with the test on rheological properties, it is proved that this micelle system is good for repeated use. Through comparison with the now maturely used hydroxypropyl guanidine gum (HPG) fracturing lfuid and microcosmic FF-TEM of its

针对氧化类的破胶剂引起的腐蚀问题,研究开发了一种复合型缓蚀剂BHH-DRH1,通过室内评价认为其很好地抑制了破胶剂JPC的腐蚀,推荐现场加注量为1.0%。该技术在南海某油田进行试用,取得了预期效果。

An compound corrosion inhibitor BHH-DRH1 was developed in order to solve corrosion problem of oxidative gel breaker. It can be show that the inhibitor can decrease effectively corrosion of gel breaker JPC in laboratory test. It was suggested that the content of inhibitor was 1%. The technology was trialed in offshore oilfield, and the trial result reached expected effect.

选出一种由长链烷基季铵盐与烷基磺酸盐复配的黏弹性表面活性剂作为清洁压裂液的稠化剂,并以此表面活性剂为主剂;向其中添加黏土稳定剂等其它添加剂,并通过单因素分析和正交实验方法,优选出新型清洁压裂液体系的配方;对其抗温性能、耐剪切性能、悬砂性能、破胶性能及黏弹性进行了室内分析。结果表明,该清洁压裂液体系具有良好的抗温稳定性,耐剪切能力强,悬砂性能好,破胶完全,破胶后残渣量较少,并且配制简单。

A viscoelastic surfactant which contained a long chain alkyl quaternary ammonium compound with a kind of alkyl sulfosalt as the thickening agent of clean fracturing fluid was selected.Then this surface active agent was used as main agent, clay stabilizer and others additives were added.The formulation of new clean fracturing fluid was obtained through single factor analysis and orthogonal test method.The temperature resistance,shear resistance,sand-suspend,gel breaking and viscoelastic performance were analyzed in the laboratory.The results showed that the clean fracturing fluid system had good temperature stability,strong shear resistance,good sand-suspend performance,and the residue and viscosity of the system after gel breaking were at a low level,which can be easy prepared.