CN103589407A - Low-surface-tension solid-free reservoir protection drilling fluid - Google Patents
Low-surface-tension solid-free reservoir protection drilling fluid Download PDFInfo
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- 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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Abstract
The invention relates to a low-surface-tension solid-free reservoir protection drilling fluid, and belongs to the technical field of petrochemical engineering. The low-surface-tension solid-free reservoir protection drilling fluid comprises, by mass, 0.2-0.3 gram of sodium carbonate, 0.2-0.4 gram of PH-value conditioning agent, 0.8-1 gram of polymer emulsion powerful coat agent, 1.5-2.5 grams of fluid loss additive, 0.3-1 gram of shearing potentiator, 2-3 grams of polymeric alcohol, 0.5-1.5 grams of surfactant, 0.05-0.1 gram of antioxidant and 0-300 grams of soluble salt in every 100ml of water in an evenly-mixed mode. The low-surface-tension solid-free reservoir protection drilling fluid does not have the solid content, the surface tension is lower than 30mN/m, and the low-surface-tension solid-free reservoir protection drilling fluid has the good reservoir protection effect and is particularly suitable for horizontal well reservoir section drilling.
Description
Technical field
The present invention relates to petrochemical technology field, relate in particular to a kind of low surface tension without solid phase reservoir protection drilling fluid.
Background technology
Along with deepening continuously of exploratory development, people more and more pay attention to for the importance of reservoir protection.Drilling fluid is requisite working fluid in drilling process, has the multiple injury that may cause, and wherein with regard to drilling fluid system itself, it is the most serious that solid invasion and liquid phase are invaded the injury causing.Clay in drilling fluid and inert particle enter after reservoir with filtrate; when particle diameter reaches hole or pore throat 1/3rd when above; just may cause reservoir possible permanent damage, therefore, clay-free drilling fluid architectural study becomes an important directions of reservoir protection.
But clay-free drilling fluid system still exists liquid phase to invade reservoir damage, liquid phase is infiltrated in oil reservoir duct, during production of hydrocarbons, the drilling fluid liquid phase being trapped in reservoir pore (produces water lock effect by produce additional capillary resistance in reservoir in hydrophilic rock, in oil-wet rock, produce Jamin effect), cause permeability to oil to reduce, reservoir is caused damage.The result of study that oneself has shows, reduces the surface tension of drilling fluid, and the row of returning that can reduce capillary resistance and raising working fluid leads, thereby reaches the object of protection reservoir.
Prior art has: the Chinese patent literature that 1, publication number is 201010172378.1 discloses a kind of clay-free drilling fluid, and described clay-free drilling fluid is by water, xanthan gum, carboxymethyl cellulose, lubrication inhibitor, sulfonated gilsonite, calcium carbonate superfine powder and form without Invasive Drilling Fluid treatment agent ST-II; With add-on in every 100 ml waters, calculate: xanthan gum 0.1-0.5 gram, carboxymethyl cellulose 0.3-0.7 gram, lubrication inhibitor 3-10 gram, sulfonated gilsonite 1-5 gram, calcium carbonate superfine powder 1-5 gram, without Invasive Drilling Fluid treatment agent BST-II1-3 gram.Good, the anti-salt of clay-free drilling fluid temperature resistance, anticalcium and the good clay-free drilling fluid of antifouling property of this invention, and hole cleaning is good in actual applications, can keep wellbore stability, well lubricity is good, control leak-off and leakage, reduce formation damage to greatest extent.But in this invention, still added the inert solid particles such as calcium carbonate superfine powder, and do not solved the Formation damage that in drilling fluid, liquid phase intrusion may cause.2, the Chinese patent literature that publication number is 201110100310.7 discloses a kind of formula without solid phase Strong Inhibitive Drilling Fluids and preparation method, has mainly solved the technical barriers such as formation contaminant, sand shale hole instability and oilness.Drilling fluid composition of the present invention is clear water+carry stick+inhibitor+fluid loss agent+mud cake activator+soluble salt; Wherein carrying stick is modification xanthan gum, inhibitor is organic amine, fluid loss agent is selected treated starch etc., mud cake activator is sulfonated gilsonite SAS, soluble salt can be selected KCL, K2SO4, HCOONa, HCOOK, in clear water, first add macromolecular host, then add micromolecular other auxiliary treatment agent, finally add soluble salt to obtain the drilling fluid of this invention.The dehydration of the drilling fluid of this invention is less than 10ml, can guarantee long horizontal traverse well wellbore stability, keeps original physical property on stratum, prevents formation contaminant, in addition, also has high-temperature stability, and permeability resume figure reaches more than 85%.It is obviously bigger than normal that this invention filter loss is less than 5ml compared with API standard-required reservoir filter loss, and also do not solve the injury that liquid phase intrusion reservoir may cause.
Summary of the invention
The object of this invention is to provide a kind of low surface tension without solid phase reservoir protection drilling fluid; in additive for drilling fluid, do not add solid insoluble particles; utilize the cloud point of polymeric alcohol and the effect of decreasing by surfactant Surface and interface tension force to realize reservoir protection; Improving Mud Carrying Capacity of the present invention is good, oilness is good, filter loss is low, strong inhibition capability, is particularly useful for horizontal well or the drilling well of extended reach well Reservoir Section.
Technical scheme of the present invention is achieved like this:
A kind of low surface tension is without solid phase reservoir protection drilling fluid; obtain as follows: according to adding Mass Calculation in every 100 ml waters: 0.2 gram to 0.3 gram of soda ash, 0.2 gram to 0.4 gram of pH value conditioning agent, 0.8 gram to 1 gram of the strong coating agent of polymer emulsion, 1.5 grams to 2.5 grams of fluid loss agents, carry and cut 0.3 gram to 1 gram of agent, 2 grams to 3 grams of polymeric alcohols, 0.5 gram to 1.5 grams, tensio-active agent; 0.05 gram to 0.1 gram of antioxidant; 0 gram to 300 grams of soluble salt, and mix and obtain low surface tension without solid phase reservoir protection drilling fluid.
Above-mentioned pH value conditioning agent is potassium hydroxide or sodium hydroxide.
The strong coating agent of above-mentioned polymer emulsion is acrylamide, potassium acrylate, 2-acrylamido-2-methyl propane sulfonic acid, epoxypropyltrimethylchloride chloride tetrapolymer and the small cation quaternary ammonium salt composite emulsion polymer coating agent obtaining of 4:1 in mass ratio.
Above-mentioned fluid loss agent is that 1:1 is composite in mass ratio obtains for cationic modified starch or carboxymethyl cellulose and polymer filtrate reducer; Polymer filtrate reducer is MAN101 or SP-8 or JT88 or polymer polyurethane.
Above-mentionedly carry that to cut agent be xanthan gum or biological polymer, its average relative molecular mass is 5 * 10
6to 1.5 * 10
7.
Above-mentioned polymeric alcohol general formula is CnH
2n+2-X (OH)
x, X gets 2 or 3; Polymeric alcohol is one or more mixtures in polyethers ethylene glycol, propylene glycol, polyoxyethylene glycol.
Above-mentioned tensio-active agent is fluorocarbon surfactant N, and 1:9 is composite in mass ratio for N-dihydroxy ethyl perfluoroalkyl acid amides or Sodium perfluorooctanoate and sodium laurylsulfonate or octadecyl trimethylammonium amine bromide.
Above-mentioned antioxidant is one or more mixtures in S-WAT, sodium bisulfite, potassium sulfite.
Above-mentioned soluble salt is one or more mixtures in potassium formiate, sodium formiate, cesium formate.
The present invention selects acrylic acid copolymer derivative thing and the composite strong coating agent of polymer emulsion of small cation quaternary ammonium salt, the anti-salt such as sulfonic group, temperature resistance group in group, had both been contained, after hydrolysis, also contain ammonium ion, there is good inhibition, tackify and coated effect, in emulsion, contain oil in water emulsion, also there is the effect that reduces filter loss and frictional resistance, for clay-free drilling fluid, realized potion multiple-effect.Polymeric alcohol is a kind of macromolecular compound with certain non-ionic surface active, due to the cloud point of himself, makes drilling fluid have excellent inhibition and oilness, can solve the stable problem of water-sensitive and strong stress shale.Thus, matching surface promoting agent can reduce the surface and interface tension force of drilling fluid system, and drilling fluid has good inhibition, anti-collapse, lubricity simultaneously.
Embodiment
The present invention is not subject to the restriction of following embodiment, can determine concrete embodiment according to the technical scheme of the invention described above and practical situation.Below in conjunction with specific embodiment, the present invention is described further.
Embodiment 1: low surface tension is without the fundamental property of solid phase reservoir protection drilling fluid
(1) fill a prescription 1: according to adding Mass Calculation in every 100 ml waters: 0.2 gram of soda ash, 0.2 gram of pH value conditioning agent, 0.8 gram of the strong coating agent of polymer emulsion, 1.5 grams of fluid loss agents, carry and cut 0.3 gram of agent, 2 grams of polymeric alcohols, 0.5 gram, tensio-active agent, 0.05 gram of antioxidant, 0 gram of soluble salt.(2) fill a prescription 2: according to adding Mass Calculation in every 100 ml waters: 0.3 gram of soda ash, 0.4 gram of pH value conditioning agent, 1 gram of the strong coating agent of polymer emulsion, 2.5 grams of fluid loss agents, carry and cut 1 gram of agent, 3 grams of polymeric alcohols, 1.5 grams, tensio-active agent, 0.1 gram of antioxidant, 300 grams of soluble salts.
(3) fill a prescription 3: according to adding Mass Calculation in every 100 ml waters: 0.25 gram of soda ash, 0.3 gram of pH value conditioning agent, 0.9 gram of the strong coating agent of polymer emulsion, 2 grams of fluid loss agents, carry and cut 0.6 gram of agent, 2.5 grams of polymeric alcohols, 1 gram, tensio-active agent, 0.1 gram of antioxidant, 150 grams of soluble salts.
(4) press apparent viscosity, plastic viscosity, yield value and the filter loss of GB/T16783.1-2006 standard testing drilling fluid, fundamental property is in Table 1:
Table 1: property of drilling fluid table of the present invention
Note: AV: apparent viscosity, PV: plastic viscosity, YP: yield value, 6: six fast rotational viscosimeters 6 of Φ turn reading, 3: six fast rotational viscosimeters 3 of Φ turn reading, GEL: gel strength, in FLAPI:API, press fluid loss, before rolling: measure after preparing, after rolling: sample is ageing 16 hours at 80 ℃ in roller furnace.Also identical with this explanation in following case study on implementation.
Embodiment 2: the present embodiment is mainly evaluated the temperature resistance of drilling fluid of the present invention
(1) formula: choose in embodiment 1 and fill a prescription 3.
(2) press apparent viscosity, plastic viscosity, yield value and the filter loss of GB/T16783.1-2006 standard testing drilling fluid, test result is in Table 2:
Table 2: the rheological of drilling fluid of the present invention and dehydration data sheet under differing temps
From table 2, drilling fluid of the present invention has good heat-resisting property, at wide temperature range performance kept stable, the oil well that can be applicable to different depths, Different Strata temperature is described.
Embodiment 3: the present embodiment is mainly evaluated the anti-salt pollution capacity of drilling fluid of the present invention
(1) formula: choose in embodiment 1 and fill a prescription 3, add again on this basis NaCl, CaCl
2and MgCl
2, to investigate salt resistance.
(2) press apparent viscosity, plastic viscosity, the yield value of GB/T16783.1-2006 standard testing drilling fluid, test result is in Table 3-table 4:
Table 3: the saline-alkaline tolerance evaluating data 1 of drilling fluid of the present invention
Table 3: the saline-alkaline tolerance evaluating data 2 of drilling fluid of the present invention
Table 3 and table 4 are visible, and the saline-alkaline tolerance of drilling fluid of the present invention is strong, can resist high-content Na
+, Ca
2+, Mg
2+the erosion of salt, anticalcium salt, magnesium salts reach more than 10%, and anti-sodium salt can reach more than 30%.This will demonstrate good performance in high salt oil reservoir, is different from the rheological of traditional polymer mud completely with the rapid phenomenon declining of salt adding amount.
Embodiment 4: the present embodiment is mainly evaluated the anti-shear ability of drilling fluid of the present invention
(1) formula: choose in embodiment 1 and fill a prescription 3.
(2) press apparent viscosity, plastic viscosity, the yield value of GB/T16783.1-2006 standard testing drilling fluid, test result is in Table 5:
Table 5: drilling fluid anti-shear ability test data of the present invention
Note: the high speed of stirring is 10000 revs/min.
Table 5 is visible, and height stirs rear drilling fluid rheology of the present invention and changes minimumly, and ratio of dynamic shear force/yield value to plastic viscosity has increased slightly on the contrary, thus can side light, and anti-shearing mechano-degradation ability is strong.
Embodiment 5: the present embodiment is mainly evaluated the inhibition of drilling fluid of the present invention
(1) formula: choose in embodiment 1 and fill a prescription 3.
(2) cuttings recovery test adopts Xinjiang Anjihaihe Stratum landwaste 6～10 orders, adds in required appraisement system, and heat is rolled by 40 order sub-sieves and reclaimed, and bake drying 2h under 90 ℃ of conditions weighs after cooling, and then calculate recovery rate.Test result is in Table 6:
Table 6: landwaste rolling rate of recovery take off data
| System | The rolling rate of recovery (%) | Ageing condition |
| Clear water | 16 | 80℃×16h |
| Drilling fluid of the present invention | 98.2 | 80℃×16h |
(3) shale expansion rate test takes 10g Xinjiang Oilfield Anjihaihe Stratum drilling cuttings powder (crossing 100 orders) and at 105 ℃, dries 2 hours, compacting 5mm rock core and drilling fluid filtrate 50ml of the present invention, with contactless High Temperature High Pressure shale expansion instrument, survey its linear expansion amount of 6 hours, press SY/T6335-1997 standard testing shale expansion rate, test result is in Table 7:
Table 7: shale expansion rate take off data
| Drilling fluid types | Rock core elemental height mm | Swell increment, mm | Rate of expansion, % |
| Clear water | 5.256 | 1.676 | 31.9 |
| Drilling fluid of the present invention | 5.321 | 0.430 | 8.1 |
From table 6, table 7, can find out, drilling fluid system of the present invention has stronger inhibition.
Embodiment 6: the present embodiment is mainly evaluated the oilness of drilling fluid of the present invention
(1) formula: choose in embodiment 1 and fill a prescription 3.
(2) press the oilness of GB/T16783.1-2006 standard testing drilling fluid, test result is in Table 8:
Table 8: oilness take off data
| System | Filter cake stuck factor | E-P extreme pressure value |
| Drilling fluid of the present invention | 0.0524 | 6-8 |
As can be seen from Table 8, drilling liquid system of the present invention has good lubricity.
Embodiment 7: the present embodiment is mainly evaluated the impact of tensio-active agent dosage on performance in drilling fluid of the present invention
(1) formula: choose in embodiment 1 and fill a prescription 3, difference is that tensio-active agent dosage is respectively 0g, 1g, 1.5g, 2g, 2.5g.
(2) press apparent viscosity, plastic viscosity, the yield value of GB/T16783.1-2006 standard testing drilling fluid; Use surface tension instrument and interfacial tensimeter test drilling fluid surface tension and interfacial tension, test result is in Table 9:
Table 9: the impact of the different dosages of tensio-active agent on system performance
Note: heat is rolled condition: 140 ℃ * 16h surface tension and interfacial tension probe temperature: 60 ℃
It is rear less on drilling fluid system rheological and filter loss impact that above data show that tensio-active agent adds, the surface tension and the interfacial tension that along with the dosage of tensio-active agent, increase drilling fluid filtrate reduce gradually, when dosage surface tension 2% time can be down to 30 mN/m, interfacial tension can be down to 3.2 mN/m and be had higher interfacial activity, thereby reduces the generation of water lock effect.
Embodiment 8: the test that low surface tension of the present invention is evaluated at reservoir protection without solid phase reservoir protection drilling fluid: according to Darcy's law; under the condition of setting in experiment, inject the various fluids relevant with formation damage; or change seepage flow condition (flow velocity, clean confined pressure etc.); measure rate of permeation and the variation thereof of rock sample, thereby evaluate the degree of damage of reservoir permeability.With reference to China National Petroleum industry standard SY/T6540-2002 < < damage of drilling fluid and completion fluid oil reservoir indoor evaluation method > >, evaluate its reservoir protection performance.Experiment condition: confined pressure is 3.5MPa, pressure reduction is 3.0MPa, and velocity slope is 300 s-1, and the infringement time is 125 min.Adopt synthetic core to record its permeability resume figure and can reach 95% to 99%.
Claims (9)
1. a low surface tension is without solid phase reservoir protection drilling fluid; it is characterized in that obtaining as follows: according to adding Mass Calculation in every 100 ml waters: 0.2 gram to 0.3 gram of soda ash, 0.2 gram to 0.4 gram of pH value conditioning agent, 0.8 gram to 1 gram of the strong coating agent of polymer emulsion, 1.5 grams to 2.5 grams of fluid loss agents, carry and cut 0.3 gram to 1 gram of agent, 2 grams to 3 grams of polymeric alcohols, 0.5 gram to 1.5 grams, tensio-active agent; 0.05 gram to 0.1 gram of antioxidant; 0 gram to 300 grams of soluble salt, and mix and obtain low surface tension without solid phase reservoir protection drilling fluid.
2. a kind of low surface tension according to claim 1, without solid phase reservoir protection drilling fluid, is characterized in that described pH value conditioning agent is potassium hydroxide or sodium hydroxide.
3. a kind of low surface tension according to claim 1, without solid phase reservoir protection drilling fluid, is characterized in that the strong coating agent of described polymer emulsion is acrylamide, potassium acrylate, 2-acrylamido-2-methyl propane sulfonic acid, epoxypropyltrimethylchloride chloride tetrapolymer and the small cation quaternary ammonium salt composite emulsion polymer coating agent obtaining of 4:1 in mass ratio.
4. a kind of low surface tension according to claim 1 is without solid phase reservoir protection drilling fluid, it is characterized in that described fluid loss agent is that 1:1 is composite in mass ratio obtains for cationic modified starch or carboxymethyl cellulose and polymer filtrate reducer; Polymer filtrate reducer is MAN101 or SP-8 or JT88 or polymer polyurethane.
5. a kind of low surface tension according to claim 1 is without solid phase reservoir protection drilling fluid, and described in it is characterized in that, carrying and cutting agent is xanthan gum or biological polymer, and its average relative molecular mass is 5 * 10
6to 1.5 * 10
7.
6. a kind of low surface tension according to claim 1, without solid phase reservoir protection drilling fluid, is characterized in that described polymeric alcohol general formula is CnH
2n+2-X (OH)
x, X gets 2 or 3; Polymeric alcohol is one or more mixtures in polyethers ethylene glycol, propylene glycol, polyoxyethylene glycol.
7. a kind of low surface tension according to claim 1 is without solid phase reservoir protection drilling fluid; it is characterized in that described tensio-active agent is fluorocarbon surfactant N, 1:9 is composite in mass ratio for N-dihydroxy ethyl perfluoroalkyl acid amides or Sodium perfluorooctanoate and sodium laurylsulfonate or octadecyl trimethylammonium amine bromide.
8. a kind of low surface tension according to claim 1, without solid phase reservoir protection drilling fluid, is characterized in that described antioxidant is one or more mixtures in S-WAT, sodium bisulfite, potassium sulfite.
9. a kind of low surface tension according to claim 1, without solid phase reservoir protection drilling fluid, is characterized in that described soluble salt is one or more mixtures in potassium formiate, sodium formiate, cesium formate.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104893689A (en) * | 2014-03-04 | 2015-09-09 | 中国石油化工股份有限公司 | Clay-free drilling fluid |
| CN104974722A (en) * | 2014-04-01 | 2015-10-14 | 中国石油天然气股份有限公司 | Solid-free drilling fluid and preparation method and application thereof |
| CN105295865A (en) * | 2015-09-15 | 2016-02-03 | 西南石油大学 | Soilless potassium formate water-based drilling fluid for drilling shale |
| CN105295866A (en) * | 2015-11-05 | 2016-02-03 | 中石化石油工程技术服务有限公司 | Composite inorganic salt drilling fluid |
| CN108084976A (en) * | 2017-12-01 | 2018-05-29 | 中国石油集团渤海钻探工程有限公司 | A kind of loose sand reservoir protection drilling fluid and preparation method thereof |
| CN108239527A (en) * | 2016-12-23 | 2018-07-03 | 中石化石油工程技术服务有限公司 | A kind of environment-friendly type gas hydrates inhibited drilling fluid and preparation method |
| CN109135694A (en) * | 2018-10-23 | 2019-01-04 | 四川泓华油气田工程科技有限公司 | A kind of drilling fluid sealing agent and preparation method thereof |
| CN109575888A (en) * | 2017-09-28 | 2019-04-05 | 中国石油化工股份有限公司 | It is a kind of without native phase cationic water base drilling fluid and preparation method thereof |
| CN109575887A (en) * | 2017-09-28 | 2019-04-05 | 中国石油化工股份有限公司 | A kind of water base low solid phase drilling fluids and preparation method thereof |
| CN111291898A (en) * | 2020-02-17 | 2020-06-16 | 哈尔滨工业大学 | Multi-task sparse Bayesian extreme learning machine regression method |
| CN115785919A (en) * | 2022-11-14 | 2023-03-14 | 延安大学 | Application of nonionic surfactant as plugging agent in drilling fluid |
| CN116042193A (en) * | 2021-10-28 | 2023-05-02 | 中国石油天然气集团有限公司 | Inverse-emulsion solid-free completion fluid and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104893689A (en) * | 2014-03-04 | 2015-09-09 | 中国石油化工股份有限公司 | Clay-free drilling fluid |
| CN104974722A (en) * | 2014-04-01 | 2015-10-14 | 中国石油天然气股份有限公司 | Solid-free drilling fluid and preparation method and application thereof |
| CN104974722B (en) * | 2014-04-01 | 2018-01-05 | 中国石油天然气股份有限公司 | Solid-free drilling fluid and preparation method and application thereof |
| CN105295865A (en) * | 2015-09-15 | 2016-02-03 | 西南石油大学 | Soilless potassium formate water-based drilling fluid for drilling shale |
| CN105295866A (en) * | 2015-11-05 | 2016-02-03 | 中石化石油工程技术服务有限公司 | Composite inorganic salt drilling fluid |
| CN108239527A (en) * | 2016-12-23 | 2018-07-03 | 中石化石油工程技术服务有限公司 | A kind of environment-friendly type gas hydrates inhibited drilling fluid and preparation method |
| CN108239527B (en) * | 2016-12-23 | 2020-03-31 | 中石化石油工程技术服务有限公司 | Environment-friendly natural gas hydrate inhibition drilling fluid and preparation method thereof |
| CN109575888A (en) * | 2017-09-28 | 2019-04-05 | 中国石油化工股份有限公司 | It is a kind of without native phase cationic water base drilling fluid and preparation method thereof |
| CN109575887A (en) * | 2017-09-28 | 2019-04-05 | 中国石油化工股份有限公司 | A kind of water base low solid phase drilling fluids and preparation method thereof |
| CN108084976A (en) * | 2017-12-01 | 2018-05-29 | 中国石油集团渤海钻探工程有限公司 | A kind of loose sand reservoir protection drilling fluid and preparation method thereof |
| CN109135694A (en) * | 2018-10-23 | 2019-01-04 | 四川泓华油气田工程科技有限公司 | A kind of drilling fluid sealing agent and preparation method thereof |
| CN111291898A (en) * | 2020-02-17 | 2020-06-16 | 哈尔滨工业大学 | Multi-task sparse Bayesian extreme learning machine regression method |
| CN116042193A (en) * | 2021-10-28 | 2023-05-02 | 中国石油天然气集团有限公司 | Inverse-emulsion solid-free completion fluid and preparation method and application thereof |
| CN116042193B (en) * | 2021-10-28 | 2024-04-30 | 中国石油天然气集团有限公司 | Inverse-emulsion solid-free completion fluid and preparation method and application thereof |
| CN115785919A (en) * | 2022-11-14 | 2023-03-14 | 延安大学 | Application of nonionic surfactant as plugging agent in drilling fluid |
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Application publication date: 20140219 |