CN102443383A - High-dehydration hardenable plugging sealing agent - Google Patents
High-dehydration hardenable plugging sealing agent Download PDFInfo
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- CN102443383A CN102443383A CN2011102612899A CN201110261289A CN102443383A CN 102443383 A CN102443383 A CN 102443383A CN 2011102612899 A CN2011102612899 A CN 2011102612899A CN 201110261289 A CN201110261289 A CN 201110261289A CN 102443383 A CN102443383 A CN 102443383A
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Abstract
The invention relates to a high-dehydration hardenable plugging sealing agent which comprises the following components by mass percent: 35-50% of solidifying material, 25-35% of composite sealing agent, 5-15% of high-dehydration material, 5-10% of elastic expending material and 10-15% of fiber material, wherein the composite sealing agent is formed by mixing granular husk, mica and cotton seed hull in a mass ratio of 5:2:1; the solidifying material is formed by mixing gypsum, cement, blast furnace slag and sodium phosphate in a mass ratio of 1:1:0.5:0.1; the high-dehydration material is kieselguhr or coal ash; the elastic expending material is formed by mixing coated water-sucking rubber and coated water-sucking resin in a mass ratio of 1:1; and the fiber material is polyacrylonitrile fiber of 9-11mm. The sealing agent integrates with high dehydration, delay expanding, plugging solidification and physical overlap joint; and the formed sealing layer is not easy to destroy in the subsequent drilling process, thereby effectively improving the sealing efficiency.
Description
Technical field
The present invention relates to the used a kind of auxiliary agent in oil drilling field, particularly a kind of high dehydration, can harden, become the plug plugging agent.
Background technology
Leakage be a kind of in drilling process drilling fluid, grout or other working fluids miss the phenomenon in the stratum.The generation of leakage not only can expend rig time, the loss drilling fluid, and possibly cause a series of complexcase such as bit freezing, blowout, well slough, and can cause well to be scrapped when serious, cause great financial loss.
Patching materials commonly used at present mainly is divided into physics patching materials and chemical plugging material: the physics patching materials mainly contains bridge joint patching materials and high dehydration patching materials.The bridge joint patching materials is mainly according to the grain composition principle, and use the nut-shell, sheet mica, rice husk, cotton seed hulls, sawdust etc. of varying particle sizes to carry out to different cracks size composite, thus the shutoff drop ply.Its main drawback be when underground crack openings size be difficult to judge or bore hole leakage section longer, and when having various ways crack or hole, the plugging agent grain diameter is difficult to rational Match with leakage stratum pore throat diameter, does not have effective leak stopping effect.High dehydration patching materials mainly is formulated by paper scrap, zeyssatite, lime etc., rapid dehydration under differential pressure action, and the solid components in the slurries is assembled, retrogradation forms filter cake, compacting then, filling leakage channel; If leakage channel is bigger, a certain proportion of particulate inert material that then in plugging agent, is mixed utilizes bridging action that the leakage channel cross-sectional area is diminished relatively, helps setting up pressure reduction, forms shutoff.Its shortcoming is when being applied to be similar to Lu Maila and burying more shallow carbonate formation, because such carbonatite is connective better, porous, property are crisp, frangible, the plugged zone of formation very easily is destroyed in follow-up drilling process and causes missing once more.The chemical plugging material mainly contains the chemical gel plugging agent, chance water is met oily expandable plugging additives, curable mortar architecture.The chemical gel plugging agent mainly is to utilize macromolecular material and linking agent generation chemical reaction to form to have certain elasticity; With rock the gelinite of strong adhesive attraction is arranged and reach the purpose of shutoff drop ply; Its main drawback is that bearing capacity is relatively poor, the bad control of gelation time.Meet water and meet oily expandable plugging additives and have certain swelling property, can not be strict with its particle and leakage channel and mate, and can be used with the bridge joint plugging agent and reach better plugging effect.But its be applied in connective better, there is ruined problem in the follow-up drilling process equally in porous, crisp, the frangible carbonatite of property.Curable cement slurry ties up in the leak stopping process, and grout is not easy to be detained at leakage channel, and Chang Yin bleeds the depths, stratum and causes leak stopping to be failed, and since the coagulating property of grout, the necessary strict control of its injection length, and difficulty of construction is big.
Summary of the invention
In order to solve the deficiency that exists in the background technology; The purpose of this invention is to provide a kind of high dehydration, can harden, become the plug plugging agent; The high dehydration of this plugging agent collection, time-delay expand, become plug curing, physics to be overlapped in one; The plugged zone that forms is difficult for being destroyed in follow-up drilling process, effectively improves leak stopping efficient.
The technical scheme that the present invention adopts is: this high dehydration, can harden, become and fill in plugging agent; Comprise following component, each component by mass percentage: solidify material 35～50%, compound leakage stop agent 25～35%, high dehydration material 5～15%, elastic expansion material 5～10%, filamentary material 10～15%; Wherein: compound leakage stop agent is the particle shell: mica: cotton seed hulls mixes by mass ratio 5:2:1; Solidify material is a gypsum: cement: blast-furnace slag: sodium phosphate mixes by mass ratio 1:1:0.5:0.1; High dehydration material is zeyssatite or flyash; The elastic expansion material is the overlay film water sucting rubber: the overlay film water-absorbing resin mixes by mass ratio 1:1; Filamentary material is the polyacrylonitrile fibre (molecular weight 10-15 ten thousand) of 9～11mm.
Overlay film water sucting rubber XJ-II and overlay film water-absorbing resin CSS evenly wrap up clay water sucting rubber and water-absorbing resin on its surface with spraying method; When pump to bit port, after hydrophthalmia shear fracture, discharge water sucting rubber and water-absorbing resin, overlay film water sucting rubber XJ-II and overlay film water-absorbing resin CSS are all available from Shandong Yiteng Chemical Co. Ltd..
The present invention has following beneficial effect: 1) shutoff speed is fast, and the leak stopping success ratio is high.Bridge formation particle in this plugging agent can produce shutoff fast through the bridge formation filling effect in hole, crack and solution cavity; Thereby the quick dehydration under differential pressure action of high dehydration material makes solid components assemble retrogradation, forms filter cake compacting then; Modified polypropylene fiber secondary on the skeleton that bridging agent forms is built bridge, and makes plugged zone fine and close more, in plugged zone, forms reticulated structure then, and plugged zone intensity is increased, and further improves the leak stopping success ratio.2) the plugged zone bearing capacity is strong, becomes plug effective, is difficult for duplicating leakage.Elastic expansion type material in this plugging agent; Adopt clay to do protective membrane, water-swelling speed is slower in configuration and injection process, and injection is passed through bit port shear fracture protective membrane behind the down-hole; The beginning water-swelling; And have the water of chance time-delay expansion characteristics, and in the plugged zone that forms, under the effect of leak-off water, continue water-swelling, further reinforce plugged zone; Solidify material in this plugging agent is filled in the leakage channel, solidifies in 6～10 hours through the adjustment dosage, thereby reinforces connective better, porous, crisp, the frangible carbonatite borehole wall of property and leakage channel.This plugging agent behind the shutoff drop ply in drop ply bore hole section further Cheng Sai, fill space and crack that the borehole wall is not communicated with, reinforce the borehole wall through solidification.Be difficult for occurring once more leakage phenomena in the back follow-up hole.3) can simplify the serious thief zone drilling program.This plugging agent compound method is simple, and available clear water is directly prepared, and does not need specific equipment, finishes only to need 8-12 hour from disposing to leak stopping.
Embodiment:
Below in conjunction with specific embodiment the present invention is further specified:
Embodiment 1, solidify material 35Kg, compound leakage stop agent 25 Kg, high dehydration material 15 Kg, elastic expansion material 10 Kg, filamentary material 15 Kg.
Embodiment 2, solidify material 40 Kg, compound leakage stop agent 30 Kg, high dehydration material 10 Kg, elastic expansion material 5 Kg, filamentary material 15 Kg.
Embodiment 3, solidify material 45 Kg, compound leakage stop agent 35 Kg, high dehydration material 5 Kg, elastic expansion material 5 Kg, filamentary material 10 Kg.
Embodiment 4, solidify material 50 Kg, compound leakage stop agent 30 Kg, high dehydration material 5 Kg, elastic expansion material 5 Kg, filamentary material 10 Kg.
Compound leakage stop agent is the particle shell in the foregoing description: mica: cotton seed hulls mixes by mass ratio 5:2:1; Solidify material is a gypsum: cement: blast-furnace slag: sodium phosphate mixes by mass ratio 1:1:0.5:0.1; High dehydration material is zeyssatite or flyash; The elastic expansion material is the overlay film water sucting rubber: the overlay film water-absorbing resin mixes by mass ratio 1:1; Filamentary material is the polyacrylonitrile fibre of 9～11mm.
More than each example be conventional preparation, after patching materials is mixed, add 40 parts of (weight) water back test each item performance that stirs according to per 60 portions of (weight) plugging agents and see table 1-3.
1, the mensuration of set time:
The plugging agent for preparing is stirred, pour in the beaker, put into the every separated 30min of water bath with thermostatic control (50 ℃) and measure once, every separated 15min measures once when closing on initial set, obtains time of coagulation.Table 1 is different embodiment determination datas set time:
Different embodiment measures table 1 set time
| Variable | Set time (h) |
| 50% embodiment, one leak stopping slurry | 10.2 |
| 50% embodiment, two leak stopping slurry | 8.4 |
| 50% embodiment, three leak stopping slurry | 7.3 |
| 50% embodiment, four leak stopping slurry | 6.1 |
Can find out from table 1, short set time according to the plugging agent that embodiment prepared, can satisfy the site operation requirement.
2, the mensuration of ultimate compression strength:
Plugging agent is placed 50 ℃ of water-bath maintenances under the temperature 48 hours, and the intensity when measuring the plugging agent generation deformation of curing back with strength tester is ultimate compression strength.50 ℃ of following each embodiment prepare plugging agent ultimate compression strength and see table 2:
Different embodiment compressive strength determination tables 2
| Variable | Ultimate compression strength (MPa) |
| Embodiment one | 20 |
| Embodiment two | 20 |
| Embodiment three | 20 |
| Embodiment four | 20 |
Can find out that from table 2 curable plugging agent has high compression strength after solidifying, can satisfy resistance to compression requirement after the shutoff.
3, the mensuration of sealing ratiod:
With the gluing silica sand of epoxy resin, prepare artificial core and carry out the shutoff experiment.Core diameter is 2.5cm, and length is 8.0cm, injects clear water earlier, surveys drill core permeability rate, injects curable plugging agent then, and maintenance is 48 hours under 50 ℃ of temperature, surveys drill core permeability rate with clear water again.Each embodiment prepares the plugging agent sealing ratiod and sees table 3:
Sealing ratiod=(rate of permeation one stifled back rate of permeation before stifled)/rate of permeation before blocking up
Different embodiment prepare plugging agent shutoff counting rate meter 3
Visible by table 3, HS plugging agent sealing ratiod of the present invention is all more than 96%, and plugging effect is good.
Field experiment:
Table 4
| Well is other | Pound sign | Applicable cases |
| Experiment well | R378 | Be drilled into Dammam layer (severe leakage layer) 627m place the property returned leakage takes place to lose, the blind 684m of being drilled into of clear water injects the compound leak stopping slurry of high density 38m3 after drilling drop ply, and loss of return goes out.According to embodiment 4 prescriptions, the preparation leak stopping is starched when 45 m3 are injected into 28 m3 has discontinuity to return out, after all injecting, pulls out of hole static 6 hours, and following probing is filled in, and bores from 636m and fills in to 684m, does not have leakage.12 hours consuming time. |
| Experiment well | R380 | Be drilled into Dammam layer (severe leakage layer) 618m place the property returned leakage takes place to lose, the blind 698m of being drilled into of clear water fills a prescription according to embodiment 4 after drilling drop ply, and 60 m3 are starched in the preparation leak stopping; Be injected into, have discontinuity to return out during 42m3, after all injecting; Pulled out of hole static 6 hours; Following probing plug is filled in to 698m from the 641m brill, does not have leakage.11 hours consuming time. |
| The contrast well | R375 | Be drilled into Dammam layer 581m the property returned leakage takes place to lose; The blind 670m of being drilled into of clear water uses high density compound leakage stop agent combination water mud mode leak stopping 5 times (adjusting used compound leakage stop agent dosage of next leak stopping and concentration according to the practical situation after each leak stopping) after drilling drop ply; Use high density compound leakage stop agent 170m3 altogether; Grout 79m3,109 hours consuming time. |
Comprehensive above-mentioned instance and relevant data, plugging agent of the present invention have advantages such as cost is low, shutoff efficient height, weak point consuming time, are particularly useful for bore hole leakage segment length, and have the serious thief zone of various ways crack or hole.
Claims (3)
1. high dehydration, can harden, become the plug plugging agent, comprise following component, each component by mass percentage: solidify material 35～50%, compound leakage stop agent 25～35%, high dehydration material 5～15%, elastic expansion material 5～10%, filamentary material 10～15%; Wherein: compound leakage stop agent is the particle shell: mica: cotton seed hulls mixes by mass ratio 5:2:1; Solidify material is a gypsum: cement: blast-furnace slag: sodium phosphate mixes by mass ratio 1:1:0.5:0.1; High dehydration material is zeyssatite or flyash; The elastic expansion material is the overlay film water sucting rubber: the overlay film water-absorbing resin mixes by mass ratio 1:1; Filamentary material is the polyacrylonitrile fibre of 9～11mm.
2. high dehydration according to claim 1, can harden, become the plug plugging agent; It is characterized in that: the zeyssatite particle diameter is the 600-800 order; The flyash particle diameter is the 600-800 order, and the blast-furnace slag particle diameter is the 200-400 order, and particle shell particle diameter is a 6-40 purpose nut-shell; Mica 6-40 purpose white mica, the cotton seed hulls particle diameter is the 2-6 order.
3. high dehydration according to claim 1, can harden, become the plug plugging agent, it is characterized in that: solidify material 50%, compound leakage stop agent 30%, high dehydration material 5%, elastic expansion material 5%, filamentary material 10%.
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