CN105400501A - Drilling fluid with strong wall protecting property for narrow-density windows - Google Patents
Drilling fluid with strong wall protecting property for narrow-density windows Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
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Abstract
The invention provides drilling fluid with strong wall protecting property for narrow-density windows. The drilling fluid comprises the following components in percentage by weight: 1.5%-2.0% of a wall protecting agent, 1.0%-1.5% of an organic inhibitor, 1.5%-2% of a filtrate reducer, 1.5%-3.0% of a temporary shielding agent, 0.1%-0.3% of a tackifier, 0.1%-0.3% of an alkali controlling agent, 1.0%-2.0% of a lubricant, 6.0%-25.0% of double salt and the balance of water. The drilling fluid is simple in preparation process, environmentally friendly, stable in system performance, good in rheological property, strong in wall protecting property, relatively good in temperature resistance and dehydration resistance and capable of effectively protecting reservoirs and stabilizing the wall of a well; the disadvantages that blocks of gas fields in east of Gansu are collapsed and leaked and poor in reservoir protection property are overcome; the drilling fluid is very applicable to the construction requirements of horizontal wells of dense oil and gas reservoirs in Changqing oilfields and has wide application prospect.
Description
Technical field
The present invention relates to the drilling fluid research field in oilfield drilling operation, be specifically related to a kind of applicable tight gas reservoir and easily cave in the strong retaining wall drilling fluid of narrow Density Window of well section.
Background technology
Regional gas field, east, Gansu Province reservoir depth of burial reaches more than 4200m, belong to the region that Ordos Basin exploitation is the darkest, at present, area, east, Gansu Province progressively expands exploitation gas field scale, some bottleneck problems are exposed, the gas well drilling speed of application of restriction this area at gas well construction process.The subject matter that drilling well aspect runs into has:
(1) reservoir buries and deeply reaches 4200-5000m, and belong to the region that Ordos Basin exploitation is the darkest, bottomhole wellbore pressure is large, and bottom temperature is high, is up to 130 DEG C;
(2) in, the straight sieve group of system is mingled with glutenite, and uniformity is poor, easily caves in, and safety drilling risk is high;
(3) be drilled into prolongation group, density is at 1.2g/cm
3afterwards, easily miss, collapse and leak with depositing, outstanding problem;
(4) poor performance such as on-the-spot drilling fluid system inhibition, temperature resistance, reservoir protection.
Summary of the invention
The object of the invention is to overcome in the regional gas well construction process in east, Gansu Province to collapse leaks with depositing, the problem of reservoir protection performance difference.
For this reason, the invention provides the strong retaining wall drilling fluid of a kind of narrow Density Window, comprise following component: by mass percentage, retaining wall agent 1.5-2.0%, organic inhibitor 1.0-1.5%, fluid loss agent 1.5-2%, shielding diverting agent 1.5-3.0%, carry stick 0.1-0.3%, alkalinity control agent 0.1-0.3%, lubricant 1.0-2.0%, geavy salt 6.0-25.0%, surplus is water.
Above-mentioned retaining wall agent is modified paraffin.
Above-mentioned organic inhibitor is organic amine multipolymer or polyethers primary amine.
Above-mentioned carries the high adhesive aggregation anionic cellulose that stick is xanthan gum or 1% solution viscosity >=2000mPas.
Above-mentioned fluid loss agent is the low adhesive aggregation anionic cellulose of 1% solution viscosity >=100mPas, the low sticky carboxylic sodium base Mierocrystalline cellulose of 1% solution viscosity >=100mPas, Natvosol, one or both in starch.
Above-mentioned shielding diverting agent is soluble cellulose or 1250 order calcium carbonate or 325 order calcium carbonate.
Above-mentioned alkalinity control agent is magnesium oxide, sodium hydroxide, potassium hydroxide, the one in calcium oxide;
Above-mentioned lubricant is water base lubricant.
The preparation method of above-mentioned drilling fluid comprises the steps:
1) following component is prepared: by mass percentage, retaining wall agent 1.5-2.0%, organic inhibitor 1.0-1.5%, fluid loss agent 1.5-2%, shielding diverting agent 1.5-3.0%, carry stick 0.1-0.3%, alkalinity control agent 0.1-0.3%, lubricant 1.0-2.0%, geavy salt 6.0-25.0%, surplus is water;
2) load the water of said ratio at the scene in slurry commanding tank, add 1.5-2% fluid loss agent, 0.1-0.3% carries stick, is fully uniformly mixed;
3) add 1.0-1.5% organic inhibitor again, stir and make it fully dissolve;
4) add 1.5-3.0% shielding diverting agent again, stir and fully mix;
5) add the agent of 1.5-2.0% retaining wall again, stir and make it fully dissolve;
6) with alkalinity control agent conditioning agent, system pH is adjusted to 9 ~ 10, in actual use, adds 1.0-2.0% lubricant according to actual needs, namely complete the preparation of this drilling fluid.
Beneficial effect of the present invention:
(1) this narrow Density Window of the present invention strong retaining wall drilling fluid preparation technology is simple; environmental friendliness; by adding retaining wall agent; layer protecting film is formed on mud shale surface; reduce pore pressure transmission, prevent borehole well instability, reduce the risk of leakage; solve Long Dong gas field block collapse leak with depositing, the feature such as reservoir protection performance difference, be applicable to very much the requirement of the fine and close oil and gas reservoir horizontal well construction of Changqing oilfields.
(2) the strong retaining wall drilling fluid of this narrow Density Window of the present invention is by retaining wall agent and shielding diverting agent acting in conjunction, improves drilling fluid shut-off capacity and excellent building capacity, is beneficial to protection reservoir.
(3) each component of this narrow Density Window of the present invention strong retaining wall drilling fluid is nontoxic, environmental acceptability good, the requirement of on-the-spot drilling fluid rheology performance can be met, can be applicable to hyposmosis and ultra-low penetration oil-gas field development drilling fluid construction in, be particularly suitable for fine and close oil and gas reservoir and environmental requirement higher construction area.
(4) the strong retaining wall drilling fluid of this narrow Density Window of the present invention recommends the inspection of drilling fluid testing standard according to API, continuously measured 6 days, system stable performance, good rheological property, indoor rejection evaluation result retaining wall is strong, and system temperature resistance 150 DEG C, has good temperature resistance and filtrate-loss control.
Accompanying drawing explanation
Fig. 1 is landwaste rate of recovery test result of the present invention;
Fig. 2 is that system temperature resistance of the present invention and filtrate-loss control can be evaluated.
Embodiment
Leak with depositing to overcome in the regional gas well construction process in east, Gansu Province to collapse, the problem of reservoir protection performance difference, the invention provides the strong retaining wall drilling fluid of a kind of narrow Density Window; comprise following component: by mass percentage; retaining wall agent 1.5-2.0%, organic inhibitor 1.0-1.5%, fluid loss agent 1.5-2%; shielding diverting agent 1.5-3.0%; carry stick 0.1-0.3%, alkalinity control agent 0.1-0.3%, lubricant 1.0-2.0%; geavy salt 6.0-25.0%, surplus is water.
The preparation method of this narrow Density Window of the present invention strong retaining wall drilling fluid is as follows:
1) following component is prepared: by mass percentage, retaining wall agent 1.5-2.0%, organic inhibitor 1.0-1.5%, fluid loss agent 1.5-2%, shielding diverting agent 1.5-3.0%, carry stick 0.1-0.3%, alkalinity control agent 0.1-0.3%, lubricant 1.0-2.0%, geavy salt 6.0-25.0%, surplus is water;
2) load the water of said ratio at the scene in slurry commanding tank, add 1.5-2% fluid loss agent, 0.1-0.3% carries stick, is fully uniformly mixed;
3) add 1.0-1.5% organic inhibitor again, stir and make it fully dissolve;
4) add 1.5-3.0% shielding diverting agent again, stir and fully mix;
5) add the agent of 1.5-2.0% retaining wall again, stir and make it fully dissolve;
6) with alkalinity control agent conditioning agent, system pH is adjusted to 9 ~ 10, in actual use, adds 1.0-2.0% lubricant according to actual needs, namely complete the preparation of this drilling fluid.
The strong retaining wall drilling fluid of this narrow Density Window of the present invention, by the agent of interpolation retaining wall, forms layer protecting film on mud shale surface, reduces pore pressure transmission, prevent borehole well instability, reduce the risk of leakage, and solving collapses leaks same contradiction of depositing; By retaining wall agent and shielding diverting agent acting in conjunction, improve drilling fluid shut-off capacity and excellent building capacity, be beneficial to protection reservoir; Each component used is nontoxic, environmental acceptability good, can meet the requirement of on-the-spot drilling fluid rheology performance, can be applicable to hyposmosis and ultra-low penetration oil-gas field development drilling fluid construction in, be particularly suitable for fine and close oil and gas reservoir and environmental requirement higher construction area.
Embodiment 1:
Present embodiments provide the strong retaining wall drilling fluid of a kind of narrow Density Window, by 1.5% fluid loss agent, 0.1% carries stick adds in clear water successively, is fully uniformly mixed; Add 1.0% organic amine inhibitors again, stir and fully dissolve, then add 1.5% shielding diverting agent, be fully uniformly mixed; Add 1.5% retaining wall agent again, stir, with alkalinity control agent regulation system pH value to 9 ~ 10, then add 6% geavy salt regulating density, finally add 1.0% lubricant, stir, abundant prehydration, is mixed with drilling fluid.
Embodiment 2:
Present embodiments provide the strong retaining wall drilling fluid of a kind of narrow Density Window, by 2.0% fluid loss agent, 0.3% carries stick adds in clear water successively, is fully uniformly mixed; Add 1.5% organic amine inhibitors again, stir and fully dissolve, then add 3.0% shielding diverting agent, be fully uniformly mixed; Add 2.0% retaining wall agent again, stir, with alkalinity control agent regulation system pH value to 9 ~ 10, then add 25% geavy salt regulating density, finally add 2.0% lubricant, stir, abundant prehydration, is mixed with drilling fluid.
Embodiment 3:
Present embodiments provide the strong retaining wall drilling fluid of a kind of narrow Density Window, by 1.8% fluid loss agent, 0.2% carries stick adds in clear water successively, is fully uniformly mixed; Add 1.3% organic amine inhibitors again, stir and fully dissolve, then add 2.2% detailed catalogue calcium carbonate, be fully uniformly mixed; Add 1.8% retaining wall agent again, stir, with alkalinity control agent regulation system pH value to 9 ~ 10, then add 16% geavy salt regulating density, finally add 1.5% lubricant, stir, abundant prehydration, is mixed with drilling fluid.
Embodiment 4:
Present embodiments provide the strong retaining wall drilling fluid of a kind of narrow Density Window, by 1.5% fluid loss agent, 0.1% carries stick adds in clear water successively, is fully uniformly mixed; Add 1.0% organic amine inhibitors again, stir and fully dissolve, then add 1.5% shielding diverting agent, be fully uniformly mixed; Add 1.5% retaining wall agent again, stir, with alkalinity control agent regulation system pH value to 9 ~ 10, then add 6% geavy salt regulating density, finally add 1.0% lubricant, stir, abundant prehydration, is mixed with drilling fluid.
Preferably, described fluid loss agent is the mixture of low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch, and low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch quality are than being 1:4, described stick of carrying is high adhesive aggregation anionic cellulose (1% solution viscosity >=2000mPas), described organic amine inhibitors is organic amine multipolymer, described shielding diverting agent is the mixture of any mass ratio of 1250 object calcium carbonate and 325 object calcium carbonate, described retaining wall agent is modified paraffin, described alkalinity control agent is sodium hydroxide, described lubricant is water base lubricant.Wherein, above-mentioned raw materials reagent all can directly be buied from market.
The performance evaluation of this drilling fluid of the present embodiment:
(1) test performance experiment
Recommend the inspection of drilling fluid testing standard according to API, the fundamental property of the present embodiment drilling fluid is as shown in table 1:
Table 1 drilling fluid fundamental property
(2) indoor rejection evaluation
Rock core of appearing is pulverized, and gets the landwaste of 6 eye mesh screens only 10 eye mesh screens, and takes 50g and put into aging tank, add 400ml clear water or drilling fluid, high temp roller furnace 90 DEG C of ageings 16 hours, after taking out, cross 40 eye mesh screens, landwaste more than cleaning screen, drying and weigh, is the landwaste rate of recovery with the ratio of initial mass.Result as shown in Figure 1, as can be seen from Figure 1, adds this drilling fluid, and primary recovery and the secondary returning yield of landwaste improve greatly, show that the rejection of this drilling fluid is strong.
(3) system temperature resistance and filtrate-loss control can be evaluated
The high temp roller furnace interior heat put into respectively by the drilling fluid system configured at different temperature rolls 16h, surveys mud property afterwards, system temperature resistance 150 DEG C.Result as shown in Figure 2, as can be seen from Figure 2, this drilling fluid is when temperature is less than 150 DEG C, system annual loss leads less, and API filtration is stablized, when temperature is greater than 150 DEG C, system annual loss leads and sharply increases, API filtration also rises gradually, system temperature resistance 150 DEG C, and temperature resistance and filtrate-loss control can be all better.
(4) system stability evaluation
Put by the mud ambient temperatare configured, survey its performance every day, continuously measured is after 6 days, the stability of appraisement system.
Table 2 drilling fluid fundamental property
| Sequence number | Performance title | Index | Index after 6 days |
| 1 | Density, g/cm 3 | 1.05 | 1.05 |
| 2 | Funnel viscosity, FV, sec. | 65 | 63 |
| 3 | API filtration, FL, mL | 4.0 | 4.2 |
| 4 | Potential of hydrogen, pH | 9 | 9 |
| 5 | Plastic viscosity, PV, mPas | 45 | 32 |
| 6 | Yield value, YP, Pa | 18.5 | 18 |
| 7 | Apparent viscosity, AV, mPa.s | 63.5 | 60 |
| 8 | Gel strength, Pa | 2/5 | 2/5 |
| 9 | Core damage recovery rate, % | 88.21 | 86.81 |
As can be seen from Table 2, this drilling fluid system has good stability.
Embodiment 5:
Present embodiments provide the strong retaining wall drilling fluid of a kind of narrow Density Window, by 2.0% fluid loss agent, 0.3% carries stick adds in clear water successively, is fully uniformly mixed; Add 1.5% organic amine inhibitors again, stir and fully dissolve, then add 3.0% shielding diverting agent, be fully uniformly mixed; Add 2.0% retaining wall agent again, stir, with alkalinity control agent regulation system pH value to 9 ~ 10, then add 25% geavy salt regulating density, finally add 2.0% lubricant, stir, abundant prehydration, is mixed with drilling fluid.
Preferably, described fluid loss agent is the mixture of low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch, and low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch quality are than being 1:6, described stick of carrying is xanthan gum, described organic amine inhibitors is organic amine multipolymer, described shielding diverting agent is the mixture of any mass ratio of 1250 object calcium carbonate and 325 object calcium carbonate, described retaining wall agent is modified paraffin, described alkalinity control agent is sodium hydroxide, and described lubricant is water base lubricant.Wherein, above-mentioned raw materials reagent all can directly be buied from market.
The performance of this drilling fluid is as shown in table 3:
Table 3 testing performance of drilling fluid result
| Sequence number | Performance title | Index |
| 1 | Density, g/cm 3 | 1.10～1.15 |
| 2 | Funnel viscosity, FV, sec. | 60～75 |
| 3 | API filtration, FL, mL | 3.5～5.0 |
| 4 | Potential of hydrogen, pH | 9～10 |
| 5 | Plastic viscosity, PV, mPas | 40～50 |
| 6 | Yield value, YP, Pa | 12～28 |
| 7 | Apparent viscosity, AV, mPa.s | 55～70 |
| 8 | Gel strength, Pa | 2/5 |
| 9 | Core damage recovery rate, % | 85～89 |
| 10 | The landwaste rate of recovery, % | 96.78/90.57 |
| 11 | System temperature resistance, DEG C | 150 |
| 12 | System stability, >= | 6 days |
Embodiment 6:
Present embodiments provide the strong retaining wall drilling fluid of a kind of narrow Density Window, by 1.8% fluid loss agent, 0.2% carries stick adds in clear water successively, is fully uniformly mixed; Add 1.3% organic amine inhibitors again, stir and fully dissolve, then add 2.2% detailed catalogue calcium carbonate, be fully uniformly mixed; Add 1.8% retaining wall agent again, stir, with alkalinity control agent regulation system pH value to 9 ~ 10, then add 16% geavy salt regulating density, finally add 1.5% lubricant, stir, abundant prehydration, is mixed with drilling fluid.
Preferably, described fluid loss agent is the mixture of low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch, and low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch quality are than being 1:5, describedly carry the mixture that stick is xanthan gum and high adhesive aggregation anionic cellulose (1% solution viscosity >=2000mPas), and xanthan gum and high adhesive aggregation anionic cellulose (1% solution viscosity >=2000mPas) mass ratio are 1:1, described organic amine inhibitors is organic amine multipolymer, described shielding diverting agent is the mixture of any mass ratio of 1250 object calcium carbonate and 325 object calcium carbonate, described retaining wall agent is modified paraffin, described alkalinity control agent is sodium hydroxide, described lubricant is water base lubricant.Wherein, above-mentioned raw materials reagent all can directly be buied from market.
The performance of this drilling fluid is as shown in table 4:
Table 4 testing performance of drilling fluid result
| Sequence number | Performance title | Index |
| 1 | Density, g/cm 3 | 1.15～1.20 |
| 2 | Funnel viscosity, FV, sec. | 60～75 |
| 3 | API filtration, FL, mL | 3.5～5.0 |
| 4 | Potential of hydrogen, pH | 9～10 |
| 5 | Plastic viscosity, PV, mPas | 40～50 |
| 6 | Yield value, YP, Pa | 12～28 |
| 7 | Apparent viscosity, AV, mPa.s | 55～70 |
| 8 | Gel strength, Pa | 2/5 |
| 9 | Core damage recovery rate, % | 85～89 |
| 10 | The landwaste rate of recovery, % | 97.12/91.86 |
| 11 | System temperature resistance, DEG C | 150 |
| 12 | System stability, >= | 6 days |
Embodiment 7:
Present embodiments provide the strong retaining wall drilling fluid of a kind of narrow Density Window, by 1.5% fluid loss agent, 0.1% carries stick adds in clear water successively, is fully uniformly mixed; Add 1.0% organic amine inhibitors again, stir and fully dissolve, then add 1.5% shielding diverting agent, be fully uniformly mixed; Add 1.5% retaining wall agent again, stir, with alkalinity control agent regulation system pH value to 9 ~ 10, then add 6% geavy salt regulating density, finally add 1.0% lubricant, stir, abundant prehydration, is mixed with drilling fluid.
Preferably, described fluid loss agent is the mixture of low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch, and low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch quality are than being 1:4, described stick of carrying is high adhesive aggregation anionic cellulose (1% solution viscosity >=2000mPas), described organic amine inhibitors is organic amine multipolymer G319, described shielding diverting agent is the mixture of any mass ratio of 1250 object calcium carbonate and 325 object calcium carbonate, described retaining wall agent is modified paraffin G325, described alkalinity control agent is sodium hydroxide, described lubricant is water base lubricant DFL-1.Wherein, above-mentioned raw materials reagent all can directly be buied from market, organic amine inhibitors is model: organic amine multipolymer G319 and retaining wall agent are model: modified paraffin G325, can from manufacturer: engineering and technological research institute of Chuan Qing drilling project company limited directly buys.
The performance of this drilling fluid is as shown in table 5:
Table 5 testing performance of drilling fluid result
| Sequence number | Performance title | Index |
| 1 | Density, g/cm 3 | 1.10～1.15 |
| 2 | Funnel viscosity, FV, sec. | 60～75 |
| 3 | API filtration, FL, mL | 3.5～5.0 |
| 4 | Potential of hydrogen, pH | 9～10 |
| 5 | Plastic viscosity, PV, mPas | 40～50 |
| 6 | Yield value, YP, Pa | 12～28 |
| 7 | Apparent viscosity, AV, mPa.s | 55～70 |
| 8 | Gel strength, Pa | 2/5 |
| 9 | Core damage recovery rate, % | 85～89 |
| 10 | The landwaste rate of recovery, % | 95.78/90.27 |
| 11 | System temperature resistance, DEG C | 150 |
| 12 | System stability, >= | 6 days |
Embodiment 8:
Present embodiments provide the strong retaining wall drilling fluid of a kind of narrow Density Window, by 2.0% fluid loss agent, 0.3% carries stick adds in clear water successively, is fully uniformly mixed; Add 1.5% organic amine inhibitors again, stir and fully dissolve, then add 3.0% shielding diverting agent, be fully uniformly mixed; Add 2.0% retaining wall agent again, stir, with alkalinity control agent regulation system pH value to 9 ~ 10, then add 25% geavy salt regulating density, finally add 2.0% lubricant, stir, abundant prehydration, is mixed with drilling fluid.
Preferably, described fluid loss agent is the mixture of low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch, and low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch quality are than being 1:6, described stick of carrying is xanthan gum, described organic amine inhibitors is organic amine multipolymer G319, described shielding diverting agent is the mixture of any mass ratio of 1250 object calcium carbonate and 325 object calcium carbonate, described retaining wall agent is modified paraffin G325, described alkalinity control agent is sodium hydroxide, described lubricant is water base lubricant DFL-1.Wherein, above-mentioned raw materials reagent all can directly be buied from market.
The performance of this drilling fluid is as shown in table 6:
Table 6 testing performance of drilling fluid result
| Sequence number | Performance title | Index |
| 1 | Density, g/cm 3 | 1.10～1.15 |
| 2 | Funnel viscosity, FV, sec. | 60～75 |
| 3 | API filtration, FL, mL | 3.5～5.0 |
| 4 | Potential of hydrogen, pH | 9～10 |
| 5 | Plastic viscosity, PV, mPas | 40～50 |
| 6 | Yield value, YP, Pa | 12～28 |
| 7 | Apparent viscosity, AV, mPa.s | 55～70 |
| 8 | Gel strength, Pa | 2/5 |
| 9 | Core damage recovery rate, % | 85～89 |
| 10 | The landwaste rate of recovery, % | 96.78/90.57 |
| 11 | System temperature resistance, DEG C | 150 |
| 12 | System stability, >= | 6 days |
Embodiment 9:
Present embodiments provide the strong retaining wall drilling fluid of a kind of narrow Density Window, by 1.8% fluid loss agent, 0.2% carries stick adds in clear water successively, is fully uniformly mixed; Add 1.3% organic amine inhibitors again, stir and fully dissolve, then add 2.2% detailed catalogue calcium carbonate, be fully uniformly mixed; Add 1.8% retaining wall agent again, stir, with alkalinity control agent regulation system pH value to 9 ~ 10, then add 16% geavy salt regulating density, finally add 1.5% lubricant, stir, abundant prehydration, is mixed with drilling fluid.
Preferably, described fluid loss agent is the mixture of low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch, and low adhesive aggregation anionic cellulose (1% solution viscosity >=100mPas) and starch quality are than being 1:5, describedly carry the mixture that stick is xanthan gum and high adhesive aggregation anionic cellulose (1% solution viscosity >=2000mPas), and xanthan gum and high adhesive aggregation anionic cellulose (1% solution viscosity >=2000mPas) mass ratio are 1:1, described organic amine inhibitors is organic amine multipolymer G319, described shielding diverting agent is the mixture of any mass ratio of 1250 object calcium carbonate and 325 object calcium carbonate, described retaining wall agent is modified paraffin G325, described alkalinity control agent is sodium hydroxide, described lubricant is water base lubricant DFL-1.Wherein, above-mentioned raw materials reagent all can directly be buied from market.
The performance of this drilling fluid is as shown in table 7:
Table 7 testing performance of drilling fluid result
| Sequence number | Performance title | Index |
| 1 | Density, g/cm 3 | 1.15～1.20 |
| 2 | Funnel viscosity, FV, sec. | 60～75 |
| 3 | API filtration, FL, mL | 3.5～5.0 |
| 4 | Potential of hydrogen, pH | 9～10 |
| 5 | Plastic viscosity, PV, mPas | 40～50 |
| 6 | Yield value, YP, Pa | 12～28 |
| 7 | Apparent viscosity, AV, mPa.s | 55～70 |
| 8 | Gel strength, Pa | 2/5 |
| 9 | Core damage recovery rate, % | 85～89 |
| 10 | The landwaste rate of recovery, % | 97.12/91.86 |
| 11 | System temperature resistance, DEG C | 150 |
| 12 | System stability, >= | 6 days |
In sum, this narrow Density Window strong retaining wall drilling fluid preparation technology of the present embodiment 1-9 is simple, environmental friendliness, the inspection of drilling fluid testing standard is recommended according to API, continuously measured 6 days, system stable performance, good rheological property, indoor rejection evaluation result retaining wall is strong, system temperature resistance 150 DEG C, there are good temperature resistance and filtrate-loss control, energy available protecting reservoir, keep wellbore stability, its retaining wall effect and the feature such as density is low, overcome Long Dong gas field block and collapse leakage with depositing, the features such as reservoir protection performance difference, be applicable to very much the requirement of the fine and close oil and gas reservoir horizontal well construction of Changqing oilfields, have broad application prospects.
More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (9)
1. the strong retaining wall drilling fluid of narrow Density Window, it is characterized in that: comprise following component: by mass percentage, retaining wall agent 1.5-2.0%, organic inhibitor 1.0-1.5%, fluid loss agent 1.5-2.0%, shielding diverting agent 1.5-3.0%, carry stick 0.1-0.3%, alkalinity control agent 0.1-0.3%, lubricant 1.0-2.0%, geavy salt 6.0-25.0%, surplus is water.
2. the strong retaining wall drilling fluid of a kind of narrow Density Window as claimed in claim 1, is characterized in that: described retaining wall agent is modified paraffin.
3. the strong retaining wall drilling fluid of a kind of narrow Density Window as claimed in claim 1, is characterized in that: described organic inhibitor is organic amine multipolymer or polyethers primary amine.
4. the strong retaining wall drilling fluid of a kind of narrow Density Window as claimed in claim 1, is characterized in that: described carries the high adhesive aggregation anionic cellulose that stick is xanthan gum or 1% solution viscosity >=2000mPas.
5. the strong retaining wall drilling fluid of a kind of narrow Density Window as claimed in claim 1, it is characterized in that: described fluid loss agent is the low adhesive aggregation anionic cellulose of 1% solution viscosity >=100mPas, the low sticky carboxylic sodium base Mierocrystalline cellulose of 1% solution viscosity >=100mPas, Natvosol, one or both in starch.
6. the strong retaining wall drilling fluid of a kind of narrow Density Window as claimed in claim 1, is characterized in that: described shielding diverting agent is soluble cellulose or 1250 order calcium carbonate or 325 order calcium carbonate.
7. the strong retaining wall drilling fluid of a kind of narrow Density Window as claimed in claim 1, is characterized in that: described alkalinity control agent is magnesium oxide, sodium hydroxide, potassium hydroxide, the one in calcium oxide.
8. the strong retaining wall drilling fluid of a kind of narrow Density Window as claimed in claim 1, is characterized in that: described lubricant is water base lubricant.
9. a preparation method for the strong retaining wall drilling fluid of narrow Density Window, is characterized in that:
Comprise the steps:
1) following component is prepared: by mass percentage, retaining wall agent 1.5-2.0%, organic inhibitor 1.0-1.5%, fluid loss agent 1.5-2%, shielding diverting agent 1.5-3.0%, carry stick 0.1-0.3%, alkalinity control agent 0.1-0.3%, lubricant 1.0-2.0%, geavy salt 6.0-25.0%, surplus is water;
2) load the water of said ratio at the scene in slurry commanding tank, add 1.5-2% fluid loss agent, 0.1-0.3% carries stick, is fully uniformly mixed;
3) add 1.0-1.5% organic inhibitor again, stir and make it fully dissolve;
4) add 1.5-3.0% shielding diverting agent again, stir and fully mix;
5) add the agent of 1.5-2.0% retaining wall again, stir and make it fully dissolve;
6) with alkalinity control agent conditioning agent, system pH is adjusted to 9 ~ 10, in actual use, adds 1.0-2.0% lubricant according to actual needs, namely complete the preparation of this drilling fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510761722.3A CN105400501A (en) | 2015-11-10 | 2015-11-10 | Drilling fluid with strong wall protecting property for narrow-density windows |
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Cited By (4)
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| CN105969323A (en) * | 2016-06-03 | 2016-09-28 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | High-density water-based drilling fluid for shale gas horizontal well |
| CN106221684A (en) * | 2016-07-28 | 2016-12-14 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Closure drilling fluid and the preparation method by force that a kind of carbonaceous mudstone is anti-collapse |
| CN108003852A (en) * | 2017-12-27 | 2018-05-08 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of low density annulus protection drilling fluid repeatedly used |
| CN108949126A (en) * | 2017-05-19 | 2018-12-07 | 中国石油化工股份有限公司 | A kind of Junggar Basin clastic reservoir rock protection drilling fluid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105969323A (en) * | 2016-06-03 | 2016-09-28 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | High-density water-based drilling fluid for shale gas horizontal well |
| CN105969323B (en) * | 2016-06-03 | 2019-01-18 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of shale gas horizontal well high-density water-based drilling fluid |
| CN106221684A (en) * | 2016-07-28 | 2016-12-14 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Closure drilling fluid and the preparation method by force that a kind of carbonaceous mudstone is anti-collapse |
| CN108949126A (en) * | 2017-05-19 | 2018-12-07 | 中国石油化工股份有限公司 | A kind of Junggar Basin clastic reservoir rock protection drilling fluid |
| CN108003852A (en) * | 2017-12-27 | 2018-05-08 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of low density annulus protection drilling fluid repeatedly used |
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Application publication date: 20160316 |