Inorganic gel profile control technology

Abstract

The invention discloses an inorganic gel profile control technology. Various profile control water shutoff agents are used and comprise a weak gel profile control agent, an inorganic gel profile control agent, a pre-crosslinking particle profile control agent and an oil-displacing agent, wherein the weak gel profile control agent comprises cross-linked polymers HPMA (hydroxypropyl methacrylate), a cross-linking agent, a stabilizing agent and a delay agent; the cross-linked polymers HPMA are partially hydrolyzed polyacrylamides; the cross-linking agent is a composite system of formaldehyde and resorcinol; the inorganic gel profile control agent is an inorganic mixing body using metasilicic acids as main ingredients and is matched with the pre-crosslinking particle profile control agent to be used in the profile control process; the pre-crosslinking particle profile control agent is a synthetic flexible macromolecule material containing a great number of hydrophilic groups; and the oil-displacing agent is a surfactant with amphiphiles. The inorganic gel profile control technology has the advantages that various profile control water shutoff agents using the inorganic gel as a main body extend to the inside of an oil reservoir to block a high-permeability zone, so that the direction of fluid is converted; injected water affects medium-low-permeability zones which are not affected in the prior art; the displacement effect is improved; and the recovery ratio is improved.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to an inorganic gel profile control technology. Background technique [0002] In the process of oil field development, as the energy of the formation declines, it is necessary to manually replenish energy to the formation. At present, the method of injecting water into the formation is generally used to replenish energy to the formation. However, as the water injection time prolongs, due to the heterogeneity of the formation, water injection Advance rapidly along the large pores or fractures, so when the oil field enters the middle and late stage, it will encounter the problem of oil well water production, which will seriously affect the production of the oil well; , in the late stage of oilfield development, measures must be taken to treat oil well water production, reduce oil well water production, and increase the ultimate recovery of oil reservoirs; in order to prevent oil ...

AI Technical Summary

Problems solved by technology

[0002] In the process of oil field development, as the energy of the formation declines, it is necessary to manually replenish energy to the formation. At present, the method of injecting water into the formation is generally used to replenish energy to the formation. However, as the water injection time prolongs, due to the heterogeneity of the formation, water injection Advance rapidly along the large pores or fractures, so when the oil field enters the middle and late stage, it will encounter the problem of oil well water production, which will seriously affect the production of the oil well; , in the late stage of oilfield development, measures must be taken to treat oil well water production, reduce oil well water production, and increase the ultimate recovery of oil reservoirs; in order to prevent oil well water production, people have adopted various methods, done a lot of research work, and adopted In terms of development plan, a reasonable well arrangement method was adopted; in terms of production measures, layered water injection technology and profile control and water shutoff technology were adopted. However, due to the heterogeneity of the formation, water injection along the uneven advancement It is still unavoidable; although the water cut of the oil well can be reduced after measures are taken for the water-producing oil well, the effective period is short and the success rate is low, especially in the stratum with severe heterogeneity; as the water injection development oilfield gradually enters the high water cut development period, in order to improve Water injection profile and injection well profile control technology have been widely used and achieved good results. Profile control and water plugging have always been an effective means for oilfields to improve water injection development effects and achieve stable production of oil reservoirs. The difficulty and requirements of oil technology are getting higher and higher, and progress has been made in the research and application of multi-component compound profile control flooding fluid diversion technology in deep