CN101353569A - Controllable cross linked gel water blockage plugging material - Google Patents
Controllable cross linked gel water blockage plugging material Download PDFInfo
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- CN101353569A CN101353569A CNA2008100461159A CN200810046115A CN101353569A CN 101353569 A CN101353569 A CN 101353569A CN A2008100461159 A CNA2008100461159 A CN A2008100461159A CN 200810046115 A CN200810046115 A CN 200810046115A CN 101353569 A CN101353569 A CN 101353569A
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Abstract
The invention relates to a controllable cross linking gel water shutoff and lost circulation material used for oil-gas fields, which can block off a fractured, vuggy or malignant leaking formation and increase the strength and stability of gel. The technical proposal is as follows: acrylamide of certain amount is added into a breaker containing deionized water, after the acrylamide dissolved, N, N-methylene-bisacrylamide and initiating agent are added, the mixture stands still for 1h at room temperature after 0.5h of gelation, therefore, lump gel product is obtained and finally becomes gel particles after granulation, parching and sieving; the gel particles are then soaked in the solution of chromium trichloride, cross linker is fully absorbed in the gel particles, and the obtained material is dried for spare; the product is then added into the solution of polyvinyl alcohol and the packaged gel particles are obtained after packaging 1-3 times and drying; finally the packaged gel particles containing the cross linker are added into the solution of the water soluble polymer HPAM for slow cross linking reaction, thus obtaining quiescent strong gel. The material is characterized by simple manufacturing process, low cost, little filtration loss and good leak tightness and stability.
Description
Technical field:
The present invention relates to a kind of may command cross linked gel water blockoff patching materials that is used for oil-gas field, particularly relate to and adopt technique for packing slowly to discharge high volence metal ion, with the water blockoff patching materials of cross-linked polymer HPAM.
Background technology:
Handling leakage is the important factor that improves drilling cost, the time of its cost accounts for about 10% of drilling well total time, and crack property, the solution cavity Slot Handling time accounts for more than 70% of Slot Handling time again, at crack property, the solution cavity severe leakage, traditional patching materials and blocking method are (as the bridging plug leak stopping, the grout leak stopping) etc. handling crack property, the weakness that himself is arranged during the pernicious leakage of hole, being difficult in pit shaft drop ply on every side stops, easily mix mutually with resident fluid, flow away after diluted, thereby the leak stopping slurry is difficult in the tight shutoff that pit shaft forms sufficient intensity on every side.Well borer author has developed some polymkeric substance patching materialss and supporting leak-stopping technique, but has tackled the still progress of achieving no breakthrough property of crack property, cave leakage from chemical terms both at home and abroad.Water blockoff leakage stopping technology based on the polymkeric substance patching materials also need carry out number of research projects.
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 content 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 model 1799; Deionized water 95, viscosity are 10～20mpa.s.
Its preparation method is:
Elder generation joins 20～30 acrylamide in the beaker that fills 70～80 deionized waters, treat that acrylamide dissolving back adds 0.005～0.02 N, the N-methylene-bisacrylamide, the initiator of adding 0.01～0.02, 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 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 the retarded 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 strong 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.
Embodiment:
Example 1～5
The gelation time and the intensity of the leak stopping of table 1 parcel one deck
Example 6～10
The gelation time and the intensity of the two-layer leak stopping of table 2 parcel
Example 11～15
The gelation time and the intensity of three layers of leak stopping of table 3 parcel
Skeleton particle 2g/100ml, the linking agent of release is few, and cross-linking set is little, and skeleton particle is few, and intensity is low, and the time is long, and skeleton particle concentration shortens greater than the 2g/100ml gelation time, intensity increases with concentration.Can adjust this water blockoff patching materials prescription according to different well depth leakage situations, to satisfy arts demand.
Claims (3)
1. controllable cross linked gel water blockage plugging material, it is characterized in that: it is as follows to prepare this water blockoff patching materials raw materials used each component and content, and wherein content unit is 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 model 1799; Deionized water 95, viscosity are 10～20mpa.s;
Its preparation method is: elder generation joins 20～30 acrylamide in the beaker that fills 70～80 deionized waters, treat that acrylamide dissolving back adds 0.005～0.02 N, the N-methylene-bisacrylamide, the initiator of adding 0.01～0.02, 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 of preparation 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 within 0.1～1mm; It is in 0.1～2% the water-soluble polymers HPAM solution, to carry out the retarded crosslinking reaction that the gel particle that will contain linking agent after will wrapping up at last adds mass percentage concentration, obtains motionless strong gel.
2. according to the described cross linked gel water blockoff of claim 1 patching materials, it is characterized in that: 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.
3. according to the described cross linked gel water blockoff of claim 1 patching materials, it is characterized in that: preparing the used stablizer of this water blockoff patching materials is with the material with reductibility, uses a kind of of S-WAT or Sulfothiorine.
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Assignee: CHENGDU DEDAO INDUSTRIAL CO., LTD. Assignor: Southwest Petroleum University Contract record no.: 2011510000117 Denomination of invention: Controllable cross linked gel water blockage plugging material Granted publication date: 20110629 License type: Exclusive License Open date: 20090128 Record date: 20110729 |
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