Summary of the invention:
The objective of the invention is: for energy shutoff crack property, the pernicious leakage of hole stratum, increase the intensity and the stability of gel, increase the intensity and the stopping property of sealing layer, the spy provides a kind of controllable cross linked gel water blockage plugging material.
In order to achieve the above object, the present invention by the following technical solutions: a kind of controllable cross linked gel water blockage plugging material is characterized in that: it is as follows to prepare this water blockoff patching materials raw materials used each component and content, wherein mass unit for the gram,
Linking agent: chromium trichloride 3, deionized water 97;
Particulated gel: acrylamide 20~30, N,N methylene bis acrylamide 0.005~0.02, initiator 0.01~0.02, deionized water 70~80, the particulated gel size is between 0.01~1mm;
The HPAM aqueous solution: partially hydrolyzed polyacrylamide is called for short HPAM, is a kind of linear macromolecule polymkeric substance, partially hydrolyzed polyacrylamide 0.1~2, molecular weight 1,000 ten thousand, 1,500 ten thousand, 1,700 ten thousand all can, degree of hydrolysis 15~25%; Stablizer 0.01~0.1; Fresh water or stratum sewage 98.0~99.9, HPAM solution viscosity are 100~500mpa.s;
Parcel liquid: polyvinyl alcohol 5 models 1799; Deionized water 95, viscosity are 10~20mpa.s.
Its preparation method is:
Acrylamide with 20~30 grams joins in the beaker that fills 70~80 gram deionized waters earlier, treat that acrylamide dissolving back adds the N of 0.005~0.02 gram, the N-methylene-bisacrylamide, the initiator that adds 0.01~0.02 gram, behind the gelation 0.5h, room temperature promptly gets the gel bulk product after leaving standstill 1h, after granulation, oven dry below 100 ℃, pulverize, screening is prepared into gel particle; Again the gel particle 30 of preparation gram being soaked in mass percentage concentration is in 3% the chromium trichloride solution, fully absorbs linking agent in gel particle inside, and chemical reaction does not take place for linking agent and water-absorption particle gel, and physical adsorption, dry for standby only take place; Be that to add mass percentage concentration be in 5% the polyvinyl alcohol solution for the particulated gel that contains the linking agent chromium trichloride of 0.01~1mm again with size, after carrying out wrapping up for 1~3 time, oven dry obtains wrapping up gel particle, and the particle diameter of the gel particle that contains linking agent behind the parcel is between 0.1~1mm; It is in 0.1~2% the water-soluble polymers HPAM solution, to carry out crosslinking reaction that the gel particle that will contain linking agent after will wrapping up at last adds mass percentage concentration, and molecule plays skeleton function, obtains motionless gel.
Preparing the used initiator of this water blockoff patching materials, is to use water miscible redox initiator, uses a kind of of ceric ammonium nitrate or hydrogen peroxide-ferrous sulfate or persulphate-sodium bisulfite or persulphate-S-WAT.Used stablizer is with the material with reductibility, uses a kind of of S-WAT or Sulfothiorine.The compound N .N-methylene-bisacrylamide of the unconjugated double bond that the present invention adopts makes and takes place crosslinkedly between the acrylamide molecular chain, forms cross-linking compounds.Adopt polyvinyl alcohol as coating agent, its effect is the release that slows down linking agent, and good with the consistency of HPAM, can form half interpenetrating network structure with HPAM under the effect of linking agent, also can further increase the intensity and the stability of gel.Skeleton particle has certain expansion characteristics, thereby improves conventional water blockoff plugging agent and rock weak bonding, the easy situation of leakage, has increased the intensity and the stopping property of sealing layer, and adding this agent can shutoff crack property, the pernicious leakage of hole stratum.
Water blockoff patching materials provided by the invention has following beneficial effect compared with prior art: (1) adds this agent energy shutoff crack property, the pernicious leakage of hole stratum.(2) linking agent that discharges in the particle and HPAM are cross-linked to form strong gel, and particle plays skeleton function, increase the intensity and the globality of gel, form stable motionless gel.(3) adopt polyvinyl alcohol as coating agent, good with the consistency of HPAM, under the effect of linking agent, can form half interpenetrating network structure with HPAM, can further increase the intensity and the stability of gel.(4) skeleton particle has certain expansion characteristics, thereby improves conventional water blockoff plugging agent and rock weak bonding, and the easy situation of leakage has increased the intensity and the stopping property of sealing layer.(5) production technique of this material is simple, and cost is lower, has that filter loss is little, characteristics of good airproof performance, good stability.