高压低渗油气藏GSB-1型压裂支撑剂研究与应用

在深井高压低渗透油气藏的开发中,压裂的成败、有效期的长短取决于支撑剂的技术性能.根据深井高压低渗透油气藏压裂改造的要求,研究了支撑剂体相形成的基本原理,开发研制了以富含铝的铝矾土为主要原料的GSB-1型低密度、高强度压裂支撑剂.介绍了压裂支撑剂的生产工艺.由于铝矾土的成分含量不同,经过高温烧结形成物相不同,采取了加入部分添加剂和相转化剂等技术措施,以促使支撑剂能形成更多的刚玉相和莫来石相,以提高支撑剂强度.性能评价结果表明:GSB-1型高强度支撑剂具有粒径分布集中,密度适中,高闭合压力下破碎率低等特点,适用于深井压裂;在60 MPa闭合压力下有较高的导流能力,同美国CARBOPROP产品相比提高了30.1%,体积密度低12.9%,视密度一致.该支撑剂在现场试验6井次,平均砂比33%,压后平均单井增加产油量1649 t,累计增加产油量9895 t.

Study on GSB-1 fracturing proppant and its application in high pressure low permeability reservoir

During the exploration of high pressure low permeability reservoir, the success of fracturing and its longevity depend on the technical properties of fracturing proppant. The basic forming principle of fracturing proppant bluk phase was studied and low density high strength fracturing proppant GSB 1 which takes bauxite as its main material was developed based on the requirements of reconstructing high pressure low permeability reservoir. Also, the production run of the proppant was presented. Because different content of bauxite leads to different bluk phase formed by high temperature sintering, the technology method of adding some additives and inversion agent into fracturing proppant to push the proppant forming more emery phase and mullite phase was employed to increase the proppant's strength. Properties testing showed that GSB 1 has such performances as centralized particle diameter, reasonable density and low disintegration rate in highly close pressure, so it can be used in deep well fracturing. It has better flow conductivity in close pressure of 60 MPa, which means comparing with America's CARBOPROP production, the conductivity was increased by 30.1% and volume density was reduced by 12.9% when observant density was identical. The proppant has been used in six wells with average proppant concentration of 33% and average increment of 1649 t per wells and accumulative total of 9895 t have been obtained.