CN1171969C - Temporary leakage-stopping agent for well drilling shielding and its application - Google Patents
Temporary leakage-stopping agent for well drilling shielding and its application Download PDFInfo
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- CN1171969C CN1171969C CNB021000557A CN02100055A CN1171969C CN 1171969 C CN1171969 C CN 1171969C CN B021000557 A CNB021000557 A CN B021000557A CN 02100055 A CN02100055 A CN 02100055A CN 1171969 C CN1171969 C CN 1171969C
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Abstract
The present invention relates to a shielding temporary blocking agent which is designed according to the characteristics of seepage loss to overcome the defects of general material blocking leakage with drillers and is temporary blocking material with the functions of preventing and blocking leakage as well as reducing reservoir stratum damage. The present invention is composed of swelling material, bridging material, filling material, inhibiting material, etc., wherein the swelling material comprises all materials, such as powders of nanmu roots, cotton bolls, etc. which can swell and form fibrous gel when dissolved in water, and the grain sizes are from 0 to 838 micrometers; the bridging material is flaky mica, and the grain sizes are from 97 to 381 micrometers; the filling material is common calcium carbonate and can also be light calcium carbonate, and the grain sizes are from 0 to 117 micrometer; the inhibiting material can be one of sodium polyacrylonitrile sodium salt, potassium polyacrylonitrile salt, ammonium polyacrylonitrile salt, potassium humate, etc. or a mixture of several kinds of the materials.
Description
Technical field
The present invention relates to the additive that uses in a kind of drilling process, particularly relate to a kind of leakproof, leak stopping and container horizon protective agent and in the application of drilling process.
Background technology
In drilling process, leakage is to want recurrent a kind of phenomenon unavoidably.Wherein especially common with permeability loss.And after in case leakage takes place, except the waste drilling fluid, increase the drilling cost, also can be when leakage is serious owing to well in fluid column pressure can not balance formation pore pressure and formation collapsed pressure, cause more serious consequence such as well kick, well slough to occur.Simultaneously, occur in the leakage of reservoir well section, except meeting causes formation damage, also may lose the chance of finding hydrocarbon zone,, then may reduce the rate of oil and gas recovery exploitation well for prospect pit.
At present, though developed much and blocked up material temporarily with boring, form according to its material, can be divided into two kinds basically, a kind of for DF-1 uniaxial pressure encapsulant (claiming the liquid sleeve pipe again) being the temporarily stifled material of representative, another kind is to be the temporarily stifled material of representative with 801 (or 891).But all there is certain problem in both, and as DF-1, plugging effect is all right; but protection hydrocarbon zone effect is relatively poor; recover test by the infiltration of reservoir core and know, reservoir core infiltration recovery rate increased value generally about 10%, is difficult to reach the purpose of protection oil and gas reservoir.And 891 temporary plugging agents, not only plugging effect is poor, and also has stronger tackified phenomenon, this brings inconvenience to rig-site utilization, as needs add again thinner dilution etc. (document sees reference: Yang Zhenjie, adjust well uniaxial pressure encapsulant leak-proof leak-stopping technology, Central Plains drilling technology, 1988 (4); He Jing, the combination patching materials is in the river geographic application in east, oil drilling technology, 1994 (4); Yellow flower bud Zhang Jianhua, the application of unidirectional pressure temporary plugging additive in the protection hydrocarbon zone, drilling fluid and well finishing liquid, 1992 (4); The thick swallow Wang Qiu of king chrysanthemum Zhang Yun, the lost circulation additive technology is in the application of Zhongyuan Oil Field, and 1995 (2); Petroleum office of Ministry of Geology and Mineral Resources scientific research project achievement Report: human relations slope, Tibet draws the exploratory area to prevent formation damage Completion Fluid applied research P13～18, P30～35).In general, as a kind of good, except possessing good plugging effect, also should have both the protection oil and gas reservoir and to characteristics such as the mud viscosity influence are little with boring temporarily stifled material.
Therefore, at the seepage loss stratum characteristic, but the temporarily stifled material of developing a kind of not only leak-proof leak-stopping but also can reducing formation damage is very necessary.The applicant answers this requirement just and has developed shielding diverting agent of the present invention, and it has also possessed the filter loss that reduces formation damage, reduces drilling fluid except the leak-proof leak-stopping characteristics that possess the lost circulation additive material, do not influence the advantage of drilling fluid rheology again.
Summary of the invention
Purpose of the present invention is exactly in order to overcome a little shortcomings of prior art, and, develop and a kind ofly get final product leakproof, leak stopping, can reduce the shield-temporary plugging material that is applicable to drilling engineering of formation damage and the application method in drilling process thereof again at the characteristics of seepage loss.
One of the present invention's shielding diverting agent is made up of following four kinds of materials:
A. swelling property material promptly can expand and form the material of fibrous gel under water-soluble situation, its particle size range is 5～381 microns;
B. bridging materials promptly has the inert solid material of certain intensity and corner angle, and its particle size range is 11～541 microns;
C. packing material, promptly with bridging materials similarly, the inert solid material of certain intensity and corner angle is arranged, its particle size range is 5～117 microns;
D. the inhibition material promptly has the organic polymer that suppresses shale and hydration and expansion of clay, and its performance satisfies People's Republic of China's oil and gas industry standard, SY/T;
Above-mentioned four kinds of materials A: B: C: D by weight are (1～5): (1～5): (0.5～5): (0.5～4).
Above-mentioned swelling property material comprises a kind of or wherein several mixture in the following material: Cortex ulmi pumilae, cotton peach, nanmu root powder, cotton, numb skin, sawdust, attapulgite, paper scrap, corn cob; Its particle size range is 5～381 microns.Wherein preferred swelling property material is Cortex ulmi pumilae, cotton peach, nanmu root powder, and preferred particle size range is 11～200 microns.
Above-mentioned bridging materials comprises a kind of or wherein several mixture in the following material: mica, lime carbonate, nut-shell, shell, oil-soluble resin, pitch, soft or hard rubber, vermiculite, quartz, its particle size range are 11～541 microns.Wherein preferred bridging materials is mica, lime carbonate, oil-soluble resin, and preferred particle size range is 97～381 microns.
Above-mentioned packing material comprises a kind of or wherein several mixture in the following material: mica, lime carbonate, nut-shell, shell, oil-soluble resin, pitch, soft or hard rubber, vermiculite, quartz, its particle size range are 5～140 microns.Wherein preferred packing material is mica, lime carbonate, nut-shell, and preferred particle size range is 5～117 microns.
Above-mentioned inhibition material comprises a kind of or wherein several mixture in the following material: polyacrylonitrile sodium salt, polyacrylonitrile sylvite, polyacrylonitrile ammonium salt, potassium humate.
The present invention's two is exactly the application as leakproof, leak stopping and container horizon protective agent in drilling process of described shielding diverting agent.
The mechanism and methods for using them of its leak-proof leak-stopping and protection oil and gas reservoir is as follows:
Bore when meeting weak zone, in drilling fluid, add a certain amount of shielding diverting agent of the present invention, under the positive pressure differential effect, bridging materials wherein and swelling property material are at nearly borehole wall formation pore or build bridge in the microfracture place and coating, the packing material filling is in its hole or microfracture, add the swelling action of swollen material, make it form the screen layer of one deck densification at the nearly borehole wall place of well, this layer screen layer perviousness is very poor, stoped drilling fluid in the stratum, to be missed, thereby reached the purpose of leak-proof leak-stopping, and improved the bearing capacity of the borehole wall.
Simultaneously, it has stoped solid phase and liquid phase in the drill in fluid to invade the reservoir pore space depths, and this layer screen layer come off from the borehole wall when pressure counter-rotating (be that reservoir pore space pressure is greater than drilling fluid column pressure), thus the original blocked hole of mediation.In addition, even when having drilling fluid filtrate to invade reservoir, because the inhibition material in the shielding diverting agent of the present invention has increased the inhibition ability of drill in fluid, reduced by filtrate and invaded clay mineral hydration swelling and the dispersion that reservoir causes, thereby reduced formation damage.
The effect of invention
Show that according to the lab and field tracking results shielding diverting agent that the present invention develops has reached requirements such as the leak-proof leak-stopping of design and protection hydrocarbon zone fully, is in particular in the following aspects:
1. the present invention is to oozing property of high hole and microfracture leakage stratum, and the leakproof success ratio reaches 100%, and is bigger to the crack, and misses serious stratum, cooperates certain carse, medium and small bridging materials, and one time the leak stopping success ratio reaches 90%.
And the leakproof success ratio of prior art DF-1 only is about 70%, and the leak stopping success ratio is lower less than 40%, 891 temporary plugging agent.Document sees reference: yellow flower bud Zhang Jianhua, the application of unidirectional pressure temporary plugging additive in the protection hydrocarbon zone, drilling fluid and well finishing liquid, 1992 (4); Petroleum office of Ministry of Geology and Mineral Resources scientific research project achievement Report: human relations slope, Tibet draws the exploratory area to prevent formation damage Completion Fluid applied research P13～18 and P30～35, and its leak-proof leak-stopping experimental data is selected and recorded in table 1.
2. the multi-functional shielding diverting agent of PB-1 of adding about 2% can make stratum infiltration recovery rate improve about 20% in drill in fluid
And the infiltration recovery rate increased value of prior art DF-1 and 891 temporary plugging agents is about 10%, sees Table 2 (this experimental data is selected from petroleum office of Ministry of Geology and Mineral Resources scientific research project achievement Report: human relations slope, Tibet draws the exploratory area to prevent the applied research of formation damage Completion Fluid).
Table 1 leak-proof leak-stopping experimental result
| Sequence number | Slurry formula | Shutoff casting bed or crack size | Plugging effect | |
| 0.7MPa | 3.5MPa | |||
| 1 | The base slurry | 80 orders are with carefully | Press total loss a little | |
| 2 | Base slurry+1%PB-1 | The 40-80 order | 5 " leakage stops, leakage 30ml | 2 " leakage 15ml blocks |
| Base slurry+1%DF-1 | 5 " leakage stops, leakage 40ml | Total loss | ||
| Base slurry+1%891 | 58 " total loss of giving vent to anger | |||
| 3 | Base slurry+2%PB-1 | The 20-40 order | 3 " leakage stops, leakage 20ml | Leakage 45ml blocks |
| Base slurry+2%DF-1 | 8 " leakage stops, leakage 50ml | Leakage 80ml blocks | ||
| Base slurry+2%891 | 67 " leakage stops, leakage 100ml | 3 minutes total loss of giving vent to anger | ||
| 4 | Base slurry+4%PB-1 | The 10-20 order | 3 " leakage stops, leakage 25ml | Leakage 20ml blocks |
| Base slurry+4%DF-1 | 3 " leakage stops, leakage 80ml | Total loss | ||
| Base slurry+4%891 | Total loss | |||
| 5 | Base slurry+2%PB-1+2%H (in) | 1mm | Normal pressure leakage 50ml, 0.7MPa misses 340ml | Leakage 50ml blocks |
| Base slurry+2%DF-1+2%H (in) | Normal pressure leakage 50ml, 0.7MPa misses 470ml | Leakage 120ml blocks | ||
| Base slurry+2%891+2%H (in) | Normal pressure leakage 50ml, 0.7MPa misses 800ml | Leakage 740ml blocks | ||
| 6 | Base slurry+2%PB-1+2%H (in) | 1mm | Normal pressure leakage 50ml, 0.7MPa misses 340ml | Leakage 50ml blocks |
| Base slurry+2%DF-1+2%H (in) | Normal pressure leakage 50ml, 0.7MPa misses 470ml | Leakage 120ml blocks | ||
| Base slurry+2%891+2%H (in) | Normal pressure leakage 50ml, 0.7MPa misses 800ml | Leakage 740ml blocks |
Annotate: the base slurry is 7% peace Qiu soil+8% Na
2CO
3(soil amount); H (in) expression medium grain nut-shell
Table 2 reservoir core infringement infiltration recovery rate evaluation experimental result
| Prescription | Infiltration recovery rate (%) | Remarks | ||
| β 1 | β 2 | β | ||
| The base slurry | 43 | The base slurry formula is: 7% peace Qiu soil+8% Na 2CO 3(soil amount); Used core is area, pine south five tame family reservoir cores. | ||
| Base slurry+2%PB-1 | 66 | 68 | 67 | |
| Base slurry+2%DF-1 | 55 | 47 | 51 | |
| Base slurry+2%891 | 50 | 54 | 52 | |
Embodiment
Embodiment 1:
The silica flour of 30 grams, 11～200 μ m Cortex ulmi pumilaes+30 grams, 97～381 μ m untreated rubbers+20 grams, 5～117 μ m+20 gram polyacrylonitrile sylvite mix the shielding diverting agent of the present invention that can obtain 100 grams.
Embodiment 2:
The light calcium carbonate of the biotite of the cotton peach powder of 25 grams, 11～200 μ m+30 grams, 97～381 μ m+20 grams, 5～117 μ m+10 gram NH
4But the PAN+15 potassium humate mixes the shielding diverting agent of the present invention that can obtain 100 grams.
The production method of this product is: swelling property material, bridging materials and packing material are become desired separately particle size range with ball mill or Raymond machine powder, press (1～5) with the inhibition material: (1～5): (0.5～5): mix (0.5～4) can obtain shielding diverting agent of the present invention.
Claims (5)
1. temporary leakage-stopping agent for well drilling shielding, it is made up of following four kinds of materials:
A. swelling property material, it is the material that can under water-soluble situation, expand and form fibrous gel, described swelling property material comprises a kind of or wherein several mixture in the following material: Cortex ulmi pumilae, cotton peach, nanmu root powder, cotton, numb skin, sawdust, paper scrap, corn cob, and its particle size range is 5～381 microns;
B. bridging materials, it is the inert solid material that certain intensity and corner angle are arranged, described bridging materials comprises a kind of or wherein several mixture in the following material: mica, lime carbonate, nut-shell, shell, oil-soluble resin, pitch, soft or hard rubber, vermiculite, quartz, its particle size range are 11～541 microns;
C. packing material, approaching with the bridging materials characteristic, it is the inert solid material that certain intensity and corner angle are arranged, described packing material comprises a kind of or wherein several mixture in the following material: mica, lime carbonate, nut-shell, shell, oil-soluble resin, pitch, soft or hard rubber, vermiculite, quartz, its particle size range are 5～140 microns;
D. the inhibition material is to have the organic polymer that suppresses shale and hydration and expansion of clay, and its performance satisfies People's Republic of China's oil and gas industry standard; Described inhibition material comprises a kind of or wherein several mixture in the following material: polyacrylonitrile sodium salt, polyacrylonitrile sylvite, polyacrylonitrile ammonium salt, potassium humate;
Above-mentioned four kinds of materials A: B: C: D by weight are (1～5): (1～5): (0.5～5): (0.5～4).
2. shielding diverting agent as claimed in claim 1 is characterized in that, described swelling property material comprises a kind of or wherein several mixture in the following material: Cortex ulmi pumilae, cotton peach, nanmu root powder.
3. shielding diverting agent as claimed in claim 1 is characterized in that, described bridging materials comprises a kind of or wherein several mixture in the following material: mica, lime carbonate, nut-shell.
4. shielding diverting agent as claimed in claim 1 is characterized in that, described packing material comprises a kind of or wherein several mixture in the following material: mica, lime carbonate, nut-shell.
5. as the application as leakproof, leak stopping and container horizon protective agent in drilling process of the described shielding diverting agent of one of claim 1～4.
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| CNB021000557A CN1171969C (en) | 2002-01-14 | 2002-01-14 | Temporary leakage-stopping agent for well drilling shielding and its application |
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-
2002
- 2002-01-14 CN CNB021000557A patent/CN1171969C/en not_active Expired - Lifetime
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| CN101613596B (en) * | 2009-08-04 | 2011-12-07 | 董殿武 | Sidewall stabilizer |
| CN103320106A (en) * | 2013-07-08 | 2013-09-25 | 饶帮玉 | Leakage-sealing temporary plugging agent for petroleum drilling fluid and preparation method of leakage-sealing temporary plugging agent |
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