Research And Application Of Clastic Rock Plugging Agent In Tahe Oilfield

High water cut oil Wells has become one of the main contradiction oilfield efficient development, seriously restrict the improvement of oil recovery, how to effectively stabilizing oil water control become an urgent task in oilfield development. Although in water plugging in tahe oilfield has done a lot of positive exploration and practice, formed with independent development of ultrafine particles and emulsion plugging agent system of plugging agent is given priority to, also conducted a silicate, chemical plugging agent such as organic gel of pilot test, has obtained certain achievements, there are also shortcomings.Based on the evaluation system has been used plugging agent, on the basis of adaptability, the ultrafine particles and emulsion of the injection pressure is high, the construction difficulties of plugging agent, into the shallow stratum, the ultrafine particles and emulsion plugging agent distribution optimization. At the same time, according to the introduction of organic gel plugging agent water plugging effect is good, but the problem of high cost, through the screening of polymer and crosslinking agent, optimization, and the optimization of polymer and crosslinking agent to optimize formula evaluation and finally developed a high temperature resistant, resistant to high salt gel plugging agent.Through this article research, explore a set of suitable for clastic rock plugging agent system in tahe oilfield. Main completed the following work and the corresponding results.(1) In the evaluation of the ultrafine particles, the silicate, emulsion, organic gel, organic silicon, such as polymer microspheres based on the applicability of the plugging agent, the independent research and development of ultrafine particles and emulsion plugging agent for selection and distribution of raw materials, compound formed a new type of ultrafine particles and emulsion plugging agent.(2) Screening of high performance polymer and crosslinking agent, and through the indoor experiment of polymer and crosslinking agent selection, optimization, optimal DM polymer and DM-2-A crosslinking agent, the DM-B as gel developed raw materials, and through the different ratio of polymer and crosslinking agent and performance evaluation, development has formed A high temperature resistant, resistant to high salt gel plugging agent.(3) Combined with the research results, this paper carried out a distribution optimization of plugging agent and resistance to high temperature, high salt gel plugging agent of field application. The optimized ultrafine particles and emulsion plugging water plugging is efficient to optimize front increased by 5.7%; Resistance to high temperature, high salt gel plugging agent single-well cost down an average of 200000 yuan of above, obtain good water plugging effect and economic benefits.