油藏目标优势菌群微生物场提高采收率技术

EOR technology of microbial field with target dominant microflora in oil reservoir

宋社民 任付平 游靖 余吉良 谷溢 巩红雨

SONG Shemin REN Fuping YOU Jing YU Jiliang GU Yi GONG Hongyu

中国石油华北油田分公司勘探开发研究院 中国石油华北油田分公司工程技术研究院 中国石油华北油田分公司第三采油厂

Exploration and Development Research Institute, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China Engineering Technology Research Institute, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China No.3 Oil Production Plant, PetroChina Huabei Oilfield Company, Hejian 062450, Hebei, China

为了提高微生物采油效果，在微生物驱过程中引入化学驱和水驱调整工艺，并通过在油藏建立目标优势菌群微生物场提高原油采收率。以宝力格油田为例，通过目标优势菌群筛选及建立高效地面发酵工艺等技术措施，使注入液菌浓由10⁶个/mL提高到10⁸个/mL，注入液表面张力降低18.6%。同时研究了铬体系可动凝胶材料、胶体与微生物的相互影响，配套开展深部调驱、分注和分层改造等扩大波及体积措施。宝力格油田巴19和巴38断块试验区通过3年实施，油藏内部已经建立了目标菌群微生物场，采收率在2012年的基础上分别提高6.77和6.1个百分点，综合含水较水驱下降3.46个百分点到6.91个百分点，采出液菌浓由10⁵个/mL增加到10⁶个/mL，表面张力降低10.7%。通过油藏目标优势菌群微生物场提高采收率技术研究，为微生物采油技术的规模化实施提供可借鉴的技术理论。

In order to improve the effects of microbial enhanced oil recovery (EOR), chemical flooding and water flooding are introduced in the process of microbial flooding. And in order to enhance the oil recovery factor, a microbial field of target predominant microflora is built up in oil reservoirs. Baolige Oilfield was taken as the example. By taking the technical measures (e.g. screening the target predominant microflora and establishing the efficient ground fermentation process), the bacterial concentration of its injected fluid was increased from 10/mL to 10/mL and the surface tension of its injected fluid was decreased by 18.6%. Furthermore, the mutual effects between chromium movable gel, colloid and microorganisms were investigated and the measures for enlarging the swept volume were taken correspondingly, including profile control, separate injection and separate layer reconstruction. It is shown that 3 years after its implementation in the test areas of fault block Ba 19 and Ba 38 of Baolige Oilfield, the microbial field of target microflora is built up inside the oil reservoirs. Compared with the values in 2012, the recovery factor is 6.77% and 6.1% higher, respectively. The composite water cut is 3.46%−6.91% lower than that of water flooding, the bacterial concentration of the produced fluid increases from 10/mL to 10/mL and the surface tension decreases by 10.7%. The studies on the EOR technology by building up microbial field of target predominant microflora in oil reservoirs provide the valuable technology and theory for the large-scale implementation of microbial EOR technology.

10.13639/j.odpt.2019.02.022