CN101851492B - High-temperature high-pressure salt-resistant high-density drilling fluid - Google Patents
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Abstract
The invention provides a high-temperature high-pressure salt-resistant high-density drilling fluid which is prepared through the following steps: taking the following components in parts by weight: 0.03 to 0.05 part of PAC-LV, 0.6 to 1.2 parts of basic slurry, 3.0 to 4.5 parts of compound potassium salt, 2.7 to 4.0 parts of compound sulfonated phenolic resin, 0.2 to 0.4 part of temperature-resistant viscosity-reducing filtrate loss reducer, 0.3 to 0.5 part of stabilizer, 4.5 to 7.0 parts of water and 80 to 90 parts of weighting agent, wherein the optimal components are 0.04 part of PAC-LV, 0.8 part of basic slurry, 3.8 parts of compound potassium salt, 3.5 parts of compound sulfonated phenolic resin, 0.3 part of temperature-resistant viscosity-reducing filtrate loss reducer, 0.4 part of stabilizer, 6.0 parts of water and 85 parts of weighting agent; through system configuration, taking 10 to 15% PAC-LV solution, adding into the basic slurry, stirring for 5 to 8 minutes at the speed of12000 revolutions/minute, sequentially adding other medicaments, stirring for 8 to 14 minutes at a high speed, adding the weighting agent, and stirring for 8 to 12 minutes at the high speed to obtain a product. The product of the invention can resist 180 DEG C of high temperature, 4.1Mpa of high pressure, 100000mg/L of sodium salt and 10000mg/L of calcium salt, has the density of 2.5g/cm<3> and is not influenced by high-valence metal ions; the density is 2.0 to 2.5g/cm<3>, and the filtrate loss at the temperature of 180 DEG C and under the pressure of 4.1MPa is smaller than 15ml/30min.
Description
Technical field
The present invention relates to drilling fluid, the performance with anti-salt resistance to compression high temperature resistance is produced in the especially maintenance of drilling fluid system, and the protection oil reservoir is not subjected to the drilling fluid of the high-temperature high-pressure salt-resistant high-density of the pollution of mud and good rheological property.
Background technology
The high temperature high density drilling fluid is that the important technology that deep-well, ultra deep well are successfully drilled guarantees.Because high density drilling fluid treatment agent under ultrahigh-temperature is selected difficulty, the processing performances such as at high temperature rheological of high density drilling fluid, dehydration building capacity are difficult to reach requirement, and the technical problem that high density drilling fluid at high temperature may exist does not have reliable experimental data and rig-site utilization experience.Therefore in the urgent need to Effect of Anti high-temperature high-density drilling fluid system.Literature search discloses: the Xiao De of Sichuan Petroleum Administration wins " deep-well high density drilling fluid operation technique " article of delivering at the 9th volume March in 1992 the 2nd phase " Drilling and completion fluids " publication, announcement selects wilkinite to prevent high density drilling fluid pressure bit freezing, and achieving success drills through the deep-well of 4000-7000 rice.The Wang Zhi of Jianghan Petroleum College dragon waits the people to deliver " high-temperature high-density drilling fluid at " Jianghan Petroleum College's journal " the 18th volume supplementary issue, test fluid " article disclosed, in system, use WL-1, WL-2 and WL-3 are that high temperature modified polymer materials is planted in Special Resin material and the corruption of heatproof, add PH conditioning agent, density adjuster, bad soil etc., produced the possibility of practical.The people such as Southwest Petrol University beam great river the 1st phase of the 30th volume " Southwest Petrol University's journal (natural science edition) " February in 2008 deliver the article of " Drilling architectural study " by preferred sulfonation class temperature resistance treatment agent, add that the shortcut such as high-temperature stabiliser has been set up 200 ℃ of temperature resistances, density reaches 2.30g/cm
3Bromine water wellbore fluid system and chloride containing potassium system, stable system, rheological are reasonable, have certain inhibition.The people such as other Zhongyuan Petroleum Exploration Bureau drilling engineering Institute for Research and Technology Wang Zhonghua are at " China and foreign countries' energy " 48 pages of articles of delivering " inorganic-organic monomer polymer drilling fluid architectural study and application " of the 13rd volume in 2008, and the 1:6% bentonite slurry of definite design+0.5%Siop-A+0.3%CPS-2000B+0.1%Siop-E+0.2%ZSC-201 fills a prescription and 2:6% bentonite slurry+0.8%Siop-A+0.3%CPS-2000B+0.2%Siop-D+0.2%ZSC-201 fills a prescription etc.The present invention is on the basis of above research, high for the deep-well bottom temperature, pressure is high and pollute, inquire into maintenance service be absorbed in " increase the weight of a thickening one viscosity reduction process a weighting agent precipitate a density descend one again increase the weight of " vicious cycle among the very crux, realized the maintenance of anti-drill body system and the purpose of new product development.
Summary of the invention
The object of the invention provides a kind of high-temperature high-pressure salt-resistant high-density drilling fluid; be used for the deep ﹠ ultra-deep well drilling fluid, have stronger property of anti-calcium and anti-salt, have the performance of high temperature resistance; can protect oil reservoir not to be subjected to the pollution of mud, play a part to carry drilling cuttings and make the mud cake densification.
The object of the present invention is achieved like this: a kind of high-temperature high-pressure salt-resistant high-density drilling fluid, get PAC-LV0.03-0.05 part, base slurry 0.6-1.2 part, compound sylvite 3.0-4.5 part, composite sulfonated resol 2.7-4.0 part, temperature resistance viscosity reduction fluid loss agent 0.2-0.4 part, stablizer 0.3-0.5 part, water 4.5-7.0 part, weighting agent 80-90 part with parts by weight; Its good component is PAC-LV0.04 part, 0.8 part in base slurry, 3.8 parts of compound sylvite, 3.5 parts in composite sulfonated resol, 0.3 part of temperature resistance viscosity reduction fluid loss agent, 0.4 part of stablizer, 6.0 parts in water, 85 parts of weighting agents; Through system configurations, get the PAC-LV solution of 10%-15%, add in the base slurry, 12000 rev/mins of lower stirrings 5-8 minute, add successively other medicament, height stirred 8-14 minute, added weighting agent, and height stirs and namely got product in 8-12 minute.
Described high density drilling fluid, the base slurry is sodium bentonite to be made into 8% solution, adds 0.4% soda ash, safeguards to get final product in 24-26 hour.
Described high density drilling fluid, temperature resistance viscosity reduction fluid loss agent is synthetic, get the mixing of resol 5-6 part and unsaturated quaternary ammonium salt 2-3 part, under pH value 9-10 alkaline condition, be heated to 90-100 ℃, constant temperature stirred 4 hours, added 2-3 part vinyl cyanide powder again, was warming up to 120 ℃, continued constant temperature 6-7 hour, oven dry powder process and get final product; Its solid content 〉=95%.
Described high density drilling fluid, stablizer is synthetic, get p-Xylol carboxylate salt 4-5 part, organic silicon surfactant 3-4 part and phenol 1-2 part Hybrid Heating, when stirring is warmed up to 45 ℃, regulate pH value 10-11, heat to 100-110 ℃, constant temperature stirred 6-7 hour, and oven dry powder process gets the organosilicon carboxylate stabilizer; Its solid content 〉=15%.
Described high density drilling fluid, the Repone K of compound sylvite, potassium formiate, potassium humate are 4: 5: 1 in mass ratio.
Described high density drilling fluid, the barite of weighting agent, ilmenite powder are 1: 2 in mass ratio.
Described high density drilling fluid, the sulfonated phenol formaldehyde resin of composite sulfonated resol, sulfonated lignite, sulfonated gilsonite are 5: 3: 3 in mass ratio.
Described high density drilling fluid, sodium bentonite, soda ash, Repone K, potassium formiate, potassium humate, sulfonated phenol formaldehyde resin, sulfonated lignite, sulfonated gilsonite, PAC-LV are low viscosity polyanionic cellulose in the component, and barite, ilmenite powder and synthesis material are the commercially available prod.
Described high density drilling fluid, product can resist 180 ℃ of high temperature, the high pressure of 4.1Mpa, and the sodium salt of 100000mg/L and the calcium salt of 10000mg/L, density is 2.5g/cm
3,Be not subjected to the impact of high volence metal ion.。
Described high density drilling fluid, product have the very high leak-off effect of falling, and are 2.0-2.5g/cm in density
3Situation under, the filter loss under 180 ℃, 4.1Mpa is less than 15ml/30min.
The present invention selects the mechanism of action of medicament:
(1) selects sodium bentonite, soda ash configuration base slurry, play the sodium effect.
(2) Repone K, potassium formiate and potassium humate are composite, and solvability is good, high-density, low solid phase, low viscosity, reduces filter loss, promote compatiblely, suppress the expansion of stratum clay.
(3) sulfonated phenol formaldehyde resin, sulfonated lignite, sulfonated gilsonite three medicaments are used in conjunction with and are desirable fluid loss agent, and high temperature resistance ability is arranged.
(4) PAC-LV plays flocculation and falls leak-off.
(5) synthetic temperature resistance viscosity reduction fluid loss agent, high temperature resistance has good fall filtration effect and viscosity reduction effect.
(6) add the synthesizing stable agent in the high salt, play the froth breaking lubrication, prevent the dehydration phenomenon of system.
(7) barite and ilmenite powder play and increase the weight of effect.
The present invention is with national GB/T16783.1-2006 standard, i.e. the testing standard of water-base drilling fluid, and (drilling fluid is joined by indoor institute, and the control density index is 2.50g/cm to estimate the performance of its product
3).
1, test base slurry traditional performance.
Table 1
| ρ(g/cm 3) | FV(s) | PV(mP·s) | YP(Pa) | G(Pa/Pa) | API(ml) | HTHP(ml) |
| 2.50 | 76 | 78 | 12 | 3/10 | 1.8 | 12 |
| The control index | 50-80 | 40-80 | 6-15 | 1-5/7-12 | ≤15ml | ≤30ml) |
2, test high temperature resistant property.
Table 2
| T(℃) | FV(s) | PV(mP·s) | YP(Pa) | G(Pa/Pa) | API(ml) | HTHP(ml) |
| 150 | 68 | 67 | 9 | 4.5/12 | 1.8 | 9 |
| 180 | 65 | 63 | 8.5 | 4/11 | 2.0 | 11 |
| The control index | 50-80 | 40-80 | 6-15 | 1-5/7-12 | ≤15ml | ≤30ml) |
Table 2 is the result show, after heat was rolled 16h under 150 ℃, the 180 ℃ conditions, this drilling fluid system still had preferably dehydration and rheological property, illustrated that this system has preferably high-temperature resistance.
3, the performance of the anti-salt pollution of test.
Measure under 180 ℃, 4.1MPa at FLHTHP, the heat condition of rolling is 180 ℃, 16h, and viscosity is 50 ℃ of lower mensuration.
Table 3
| NaCl(％) | PV(mPa·s) | YP(Pa) | G(Pa/Pa) | FL/ mud cake (ml/mm) | FLHTHP mud cake (ml/mm) |
| 0 | 35 | 17 | 2.5/8.5 | 3.2/1.0 | 9.6/3.0 |
| 5 | 32 | 18 | 2.0/3.0 | 5.8/1.0 | 12.8/3.5 |
| 10 | 29 | 18 | 1.5/2.0 | 6.8/2.0 | 17.6/5.0 |
| 15 | 25 | 20 | 4.0/5.0 | 7.4/1.5 | 21.0/5.0 |
Table 3 is the result show, the apparent viscosity of drilling fluid and plastic viscosity be with the adding of NaCl, the rear increase that diminishes first, and yield value and filter loss increase always; This is that ζ-potential descends because along with the increasing of Na+, the diffusion double layer of clay particle is squeezed, and causes the hydration shell attenuation, and a large amount of clay particles have formed space grid structure together, and viscosity, yield value and filter loss are increased; All in all, not too large change of property of drilling fluid, the saline-alkaline tolerance of system is strong.
4, the test anticalcium is invaded dirty performance.
Add respectively cement, lime and CaCl in well liquid, heat is rolled 16h and is namely tested under 180 ℃ of conditions.
Table 4
| Pollutent and dosage | ρ(g/cm 3) | PV(mP·s) | YP(Pa) | G(Pa/Pa) | FL(API)(ml) | Δρ(g/cm 3) |
| The base slurry | 2.50 | 99 | 9 | 4.5/12 | 1.8 | 0.02 |
| 3% cement | 2.50 | 96 | 8.5 | 4/12 | 1.9 | 0.02 |
| 3% lime | 2.51 | 95 | 8 | 4/11 | 1.7 | 0.03 |
| 2％CaCl | 2.51 | 91 | 7 | 3.5/12 | 2.1 | 0.03 |
Table 4 is the result show, this product high temperature resistance high salt tolerance calcium fouling resistance ability is strong, is not subjected to the impact of calcium particle, and the suspension stability of system is (Δ p refer to the static 24h of drilling fluid after difference of densities) better.
5, test lubricity.
Pressure differential sticking easily occurs when there is High Pressure Difference in stratum permeability well section, and the lubricate and sticking control of drilling fluid under the high-density is had higher requirement.Indoor NZ filter cake stuck factor determinator has been measured indoor lubricity of joining drilling fluid.
Table 5
| ρ(g/cm 3) | Filter cake stuck factor | The extreme boundary lubrication coefficient |
| 2.50 | 0.0699 | 0.202 |
Table 5 is the result show: density is 2.50g/cm
3High temperature resistance high salt tolerance high density drilling fluid still have good oilness, be conducive to the carrying out of safety drilling, can avoid the generation of the complex accident such as pressure differential sticking.
6, the test density scope of application.
System density can be adjusted according to the add-on of weighting agent, and other basic medicament is constant.
Table 6
| ρ(g/cm 3) | T(℃) | FV(s) | PV(mP·s) | YP(Pa) | G(Pa/Pa) | FL(API)(m) | HTHP(ml) |
| 2.0 | 180 | 74 | 70 | 9 | 4/9.5 | 1.4 | 6 |
| 2.3 | 180 | 77 | 71 | 12 | 7/13 | 1.7 | 9 |
| 2.5 | 180 | 81 | 73 | 16 | 7/15.5 | 1.8 | 11 |
Table 7 different densities drilling fluid allocation
| 2.5g/ml | 2.3g/ml | 2.0g/ml | |
| Medicament | Contained ratio % (mass ratio) | Contained ratio % (mass ratio) | Contained ratio % (mass ratio) |
| 8% has safeguarded sodium bentonite | 0.64 | 0.87 | 1.1 |
| Compound sylvite | 3.13 | 3.83 | 4.53 |
| PAC-LV | 0.03 | 0.04 | 0.05 |
| Composite sulfonated resol | 2.75 | 3.37 | 3.99 |
| Temperature resistance viscosity reduction fluid loss agent | 0.23 | 0.31 | 0.38 |
| Stablizer | 0.35 | 0.4 | 0.46 |
| Weighting agent | 88.29 | 85.42 | 82.55 |
| Water | 4.58 | 5.76 | 6.94 |
Table 6,7 results show: drilling fluid system density is 2.0-2.5g/cm
3The time, effect is very remarkable.
The present invention is used for the deep ﹠ ultra-deep well drilling fluid, can resist 180 ℃ of high temperature, the high pressure of 4.1Mpa, and the sodium salt of 100000mg/L and the calcium salt of 10000mg/L, density is 2.5g/cm
3, be not subjected to the impact of high metal ion; And have the very high leak-off effect of falling, be 2.0-2.5g/cm in density
3Situation under, the filter loss under 180 ℃, 4.1Mpa is less than 15ml/30min; And protect oil reservoir not to be subjected to the pollution of mud, and play a part to carry drilling cuttings and make the mud cake densification, show technical progress.
Control Example of the present invention is described further.
Embodiment
Embodiment
Prescription 1: get PAC-LV0.05 part, 1.2 parts in base slurry, 4.5 parts of compound sylvite, 4.0 parts in composite sulfonated resol, 0.4 part of temperature resistance viscosity reduction fluid loss agent, 0.5 part of stablizer, 7.0 parts in water, 90 parts of weighting agents with parts by weight;
Prescription 2: get PAC-LV0.04 part, 0.8 part in base slurry, 3.8 parts of compound sylvite, 3.5 parts in composite sulfonated resol, 0.3 part of temperature resistance viscosity reduction fluid loss agent, 0.4 part of stablizer, 6.0 parts in water, 85 parts of weighting agents with parts by weight;
Above prescription prepares through system configurations: get 15% PAC-LV solution, add in the base slurry, 12000 rev/mins of lower stirrings 8 minutes, add successively other medicament, height stirred 14 minutes, added weighting agent, and height stirs the product that namely got high-temperature high-pressure salt-resistant high-density drilling fluid in 12 minutes.
Wherein:
(a) temperature resistance viscosity reduction fluid loss agent is synthetic:
Resol+unsaturated quaternary ammonium salt → quaternary ammonium salt resol
Vinyl cyanide powder+quaternary ammonium salt resol → anti-salt viscosity reduction fluid loss agent
Method: with 5 parts in resol and 2 parts of mixing of unsaturated quaternary ammonium salt, be heated to 100 ℃ under PH 10 conditions first, constant temperature stirred after 4 hours, added 3 parts of vinyl cyanide powder again, was warming up to 120 ℃, continued constant temperature 6 hours, and oven dry powder process gets product.
(b) stablizer is synthetic:
Organic silicon surfactant+p-Xylol carboxylate salt+phenol → organosilicon carboxylate stabilizer
Method: get first 5 parts of p-Xylol carboxylate salts, 4 parts of organic silicon surfactants and 1 part of Hybrid Heating of phenol, stir when being warmed up to 45 ℃, regulating PH is 11, heats to 100 ℃, and constant temperature stirred 6 hours, and oven dry powder process gets product.
(c) preparation of compound sylvite
With Repone K, potassium formiate, potassium humate be in mass ratio 4: 5: 1 composite.
(d) 8% preparation of having safeguarded sodium bentonite
Stir down at 12000 rev/mins height, sodium bentonite is made into 8% solution, add 0.4% soda ash, safeguarded 24 hours to get basic slurry.
(e) preparation of composite sulfonated resol
With sulfonated phenol formaldehyde resin, sulfonated lignite, sulfonated gilsonite be in mass ratio 5: 3: 3 composite.
(f) preparation of weighting agent
With barite and ilmenite powder be in mass ratio 1: 2 composite.
Embodiment
System density is configured to 2.0-2.5g/cm
3The time, result of use is very remarkable.
With this Xinjiang well of giving an example: 7118 meters of design well depths, when this well is drilled into 5569 meters, use conventional mud, density is 2.21-2.24g/cm
3, viscosity 80-90 second, dehydration 16-18ml.Trip-out is hampered, and activity connects square kelly after tripping out 2 thribbles, and drilling tool can't be movable, and sticking card occurs.The bubble oil treatment is invalid, breakouting pack of dynamite, and sidetracking uses drilling fluid of the present invention to adjust mud density and is 2.49-2.50g/cm
3, recover normal, viscosity 75-85 second, dehydration 8-9ml continues to creep into to 7116 meters, and any complexcase do not occur in the down-hole, think and no longer bore the layer that achieves the goal and open following stratum.Well-flushing, lower protector string; Sand string pressure testing 55Mpa, pressure did not fall in 30 minutes, and bobbin seal is good, completion.
Claims (6)
1. a high-temperature high-pressure salt-resistant high-density drilling fluid is characterized in that: get PAC-LV0.03-0.05 part, base slurry 0.6-1.2 part, compound sylvite 3.0-4.5 part, composite sulfonated resol 2.7-4.0 part, temperature resistance viscosity reduction fluid loss agent 0.2-0.4 part, stablizer 0.3-0.5 part, water 4.5-7.0 part, weighting agent 80-90 part with parts by weight; Through system configurations, get the PAC-LV solution of 10%-15%, add in the base slurry, 12000 rev/mins of lower stirrings 5-8 minute, add successively other medicament, height stirred 8-14 minute, added weighting agent, and height stirs and namely got product in 8-12 minute;
Wherein the Repone K of compound sylvite, potassium formiate, potassium humate are 4: 5: 1 in mass ratio;
Wherein the barite of weighting agent, ilmenite powder are 1: 2 in mass ratio;
Wherein the sulfonated phenol formaldehyde resin of composite sulfonated resol, sulfonated lignite, sulfonated gilsonite are 5: 3: 3 in mass ratio.
2. high density drilling fluid according to claim 1 is characterized in that: the base slurry is sodium bentonite to be made into 8% solution, adds 0.4% soda ash, safeguards to get final product in 24-26 hour.
3. high density drilling fluid according to claim 1, it is characterized in that: temperature resistance viscosity reduction fluid loss agent is synthetic, get the mixing of resol 5-6 part and unsaturated quaternary ammonium salt 2-3 part, under pH value 9-10 alkaline condition, be heated to 90-100 ℃, constant temperature stirred 4 hours, added 2-3 part vinyl cyanide powder again, was warming up to 120 ℃, continued constant temperature 6-7 hour, oven dry powder process and get final product; Its solid content 〉=95%.
4. high density drilling fluid according to claim 1, it is characterized in that: stablizer is synthetic, get p-Xylol carboxylate salt 4-5 part, organic silicon surfactant 3-4 part and phenol 1-2 part Hybrid Heating, when stirring is warmed up to 45 ℃, regulate pH value 10-11, heat to 100-110 ℃, constant temperature stirred 6-7 hour, and oven dry powder process gets the organosilicon carboxylate stabilizer; Its solid content 〉=15%.
5. high density drilling fluid according to claim 1, it is characterized in that: product can resist 180 ℃ of high temperature, the high pressure of 4.1MPa, the sodium salt of 100000mg/L and the calcium salt of 10000mg/L, density is 2.5g/cm
3, be not subjected to the impact of high volence metal ion.
6. high density drilling fluid according to claim 1, it is characterized in that: product has the very high leak-off effect of falling, and is 2.0-2.5g/cm in density
3Situation under, the filter loss under 180 ℃, 4.1MPa is less than 15ml/30min.
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| CN101148579A (en) * | 2007-10-27 | 2008-03-26 | 东营泰尔石油技术有限公司 | High temperature resistant circulating micro-foam drilling fluid or completion fluid |
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Address after: 830013 Urumqi high tech Zone (new city) North Industrial Park, blue sky road, No. 216, No. Patentee after: DELAND WATER TECHNOLOGY Co.,Ltd. Address before: 830011 No. 682 South Tianjin Road, the Xinjiang Uygur Autonomous Region, Urumqi Patentee before: XINJIANG DELAND Co.,Ltd. |