【摘要】：針對(duì)目前壓裂作業(yè)向著高溫油氣藏措施改造、節(jié)約用水,利用海水、地層高礦化度水配液等非常規(guī)領(lǐng)域的拓展,通過對(duì)疏水締合聚合物壓裂液增黏機(jī)理研究,基于陰陽離子電吸引原理,開發(fā)研制了自締合高抗鹽壓裂液體系,并對(duì)其進(jìn)行了性能評(píng)價(jià)和現(xiàn)場(chǎng)應(yīng)用。研究表明,在陽離子聚合物溶液中加入陰離子表面活性劑十二烷基苯磺酸鈉,可以使聚合物分子通過靜電吸引作用進(jìn)行自締合交聯(lián),并通過在分子中引入球狀膠束及鈣鎂離子穩(wěn)定劑,大幅度增強(qiáng)壓裂液的抗溫抗鹽性能。該壓裂液體系黏度可以達(dá)到331 m Pa·s,耐鹽達(dá)60 000 mg·L-1,有良好的抗鈣鎂性能,巖心傷害性低,在130℃、170 s-1剪切1 h后黏度保持在50 m Pa·s以上,可以滿足60~130℃水溫配液和壓裂施工的要求;并且該壓裂液在剪切速率上升時(shí)黏度降低,剪切速率下降時(shí)黏度又會(huì)恢復(fù),可以有效降低摩阻。該體系在華北油田二連地區(qū)阿爾3-26井現(xiàn)場(chǎng)應(yīng)用,采用礦化度達(dá)到9 104 mg·L-1的鄰井地層水直接進(jìn)行配液,提高了施工效率,增油效果顯著。體系原料易得、成本價(jià)格低,抗鹽性明顯優(yōu)于其他壓裂液體系,具有良好的應(yīng)用前景。
[Abstract]:In view of the unconventional fields of fracturing operation, such as reforming high temperature oil and gas reservoir, saving water, using seawater, high salinity water in formation and other unconventional fields, the viscosity increasing mechanism of hydrophobically associating polymer fracturing fluid is studied by means of hydrophobic association polymer fracturing fluid. Based on the principle of anion electric attraction, the self-associating high salt resistant fracturing fluid system was developed, and its performance evaluation and field application were carried out. The results show that the addition of anionic surfactant sodium dodecylbenzene sulfonate in cationic polymer solution can make polymer molecules self-associate and crosslink by electrostatic attraction. By introducing spherical micelles and calcium and magnesium ion stabilizers into the molecule, the temperature and salt resistance of fracturing fluid was greatly enhanced. The viscosity of the fracturing fluid system can reach to 60 000 mg L ~ (-1) of salt tolerance for 331 m Pa s, and has good resistance to calcium and magnesium, and low core damage. The viscosity of the fracturing fluid system remains above 50 m Pa s after being shearing at 130 鈩，

本文編號(hào)：2361242