CN102234501B - Ocean deepwater water-based constant-rheology drilling fluid - Google Patents
Ocean deepwater water-based constant-rheology drilling fluid Download PDFInfo
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Abstract
The invention relates to an ocean deepwater water-based constant-rheology drilling fluid and belongs to the technical field of petroleum drilling engineering chemical agents. The drilling fluid is characterized by comprising the following components in percentage by weight: 2-4% of clay, 3-8% of flow control agent, 2-5% of inhibitor, 1-3% of fluid loss additive, 2-6% of lubricant, 0.1-0.6% of pH regulator, 0-40% of weighting agent and the balance of water. The drilling fluid provided by the invention can be used for solving the problems that the viscosity of the conventional drilling fluid increases at low temperature and decreases at high temperature and reducing the sensitivity of viscosity change along with the temperature of the whole drilling fluid system, thus realizing a constant-rheology state; and the drilling fluid has strong inhibition and lubrication properties and is an effective deepwater low-temperature water-based constant-rheology drilling fluid system.
Description
Technical field:
The present invention relates to a kind of ocean deepwater water-based constant-rheology drilling fluid, belong to petroleum drilling engineering chemical agent technical field.
Background technology:
Drilling fluid refers to satisfy with its several functions the general name of the various circulating fluid of drilling well need of work in the oil/gas drilling process; its Main Function is carry and suspend landwaste, stabilizing borehole and equilibrium strata pressure, Cooling and Lubricator drilling tool, transmission water power, protection hydrocarbon zone etc., is the important component part of drilling engineering technology.
Marine field is being contained a large amount of virgin oils, and especially the prospective oil at ocean deepwater place is surprising especially, and the deepwater drilling operation is the important step of ocean deepwater Exploration of Oil And Gas and exploitation.Deep water often is accompanied by high pressure and low temperature, in the temperature at seabed mud line place near 0 ℃.And the difficult control of the rheological characteristics that conventional drilling liquid shows at low temperatures, owing to have low fracture pressure gradient and fragile shale condition, in the time of near circulation of drilling fluid is passed through mud line, larger variation can occur in its rheological, be in particular in that viscosity, shear force significantly increase, also the fast gelation effect might occur, thereby cause the circulation of drilling fluid difficulty and press leaking the stratum.
Test by the rheological that wellbore fluid is tied up to 4--65 ℃ of temperature range, in this scope, investigate the rheological of drilling fluid, guarantee that its variation in the total temperature section is less, especially the variation at high temperature and low temperature place is less, just can prevent the appearance of the problems such as circulation of drilling fluid difficulty.But, in present existing water-base drilling fluid, all drilling fluid systems all show as in low temperature place viscosity and increase, in the characteristics of high temperature place reduced viscosity, therefore, existing water-based drilling liquid system can't satisfy the demand of ocean deepwater oil-gas exploration and Development Engineering.
Summary of the invention:
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of ocean deepwater water-based constant-rheology drilling fluid, its rheological when low temperature and high temperature is all comparatively stable, changes littlely, has that the susceptibility that viscosity with temperature changes is low, inhibition and oilness characteristics preferably.
The present invention realizes above-mentioned purpose by following technical solution.
A kind of ocean deepwater water-based constant-rheology drilling fluid provided by the present invention, it consists of clay, flow pattern control agent, inhibitor, fluid loss agent, lubricant, PH conditioning agent, weighting agent, seawater; Wherein the weight percent of each component is:
Clay: 2--4%;
Flow pattern control agent: 3--8%;
Inhibitor: 2--5%;
Fluid loss agent: 1--3%;
Lubricant: 2--6%;
PH conditioning agent: 0.1--0.6%;
Weighting agent: 0--40%;
Seawater: surplus.
Described clay can use separately for wilkinite commonly used, attapulgite, sepiolite, saponite etc., also can compositely use;
Described flow pattern control agent is a kind of water-soluble polymers of modification, and it is caused by water soluble starter by monomers such as AM, AA, AMPS, MAA, MA, N-N-dimethacrylate, vinylbenzene acetic esters, through in twos or multiple being polymerized; It has the characteristics such as flow pattern adjusting, leak-off control and raising oilness, it is except the characteristics with general polymer, also have good thermal adaptability, i.e. its viscosity with temperature variation is insensitive, can all have preferably viscosity controller effect under high temperature and low temperature; Can use separately, also can composite a certain amount of xanthan gum, Rhizoma amorphophalli powder, CMC, polyacrylamide, HEC etc.;
Described inhibitor is potassium acetate, potassium formiate, Repone K, calcium chloride etc., can use separately, also can compositely use;
Described fluid loss agent is sulfonated phenol formaldehyde resin, humic acid multi-element multipolymer, treated starch etc., can use separately, also can compositely use;
Described lubricant is polyoxyethylene stearic acid ester, polyvalent alcohol, polynary ether etc., can use separately, also can compositely use;
Described PH conditioning agent is sodium hydroxide, potassium hydroxide, sodium bicarbonate, yellow soda ash etc., can use separately, also can compositely use;
Described weighting agent is barite or Wingdale, can decide according to the density requirements of drilling fluid the dosage of weighting agent.
A kind of ocean deepwater water-based constant-rheology drilling fluid provided by the present invention adopts conventional compound method preparation to get final product.
The present invention has following beneficial effect compared with prior art:
1, drilling fluid of the present invention has solved conventional drilling liquid and has increased and in the problem that high temperature viscosity reduces in low temperature viscosity, and the Reduced susceptibility that the viscosity with temperature of whole drilling fluid system is changed has reached a kind of constant current and become state.
2, drilling fluid of the present invention has stronger inhibition and oilness, and the inhibition of soft mud shale is better during for the shallow surface hole drilling of deep water.
The problems such as 3, drilling fluid of the present invention can solve low temperature tackify when deepwater drilling, causes pump pressure to raise, and running pulp is serious are that the effective water base constant current of deep-water low-temperature of a cover becomes drilling fluid system.
Embodiment:
The invention will be further described below in conjunction with specific embodiment:
Embodiment 1:
A kind of ocean deepwater water-based constant-rheology drilling fluid provided by the present invention, wherein the weight percent of each component is:
Wilkinite: 3%; Flow pattern control agent: 6%; Inhibitor: 4%; Fluid loss agent: 2%; Lubricant: 4%; Yellow soda ash: 0.25%; Sodium hydroxide: 0.1%; Seawater: surplus.
Embodiment 2:
A kind of ocean deepwater water-based constant-rheology drilling fluid provided by the present invention, wherein the weight percent of each component is:
Wilkinite: 3%; Flow pattern control agent: 4%; Inhibitor: 3%; Fluid loss agent: 2%; Lubricant: 3%; Sodium hydroxide: 0.2%; Sodium bicarbonate: 0.3%; Barite: 20%; Seawater: surplus.
Embodiment 3:
A kind of ocean deepwater water-based constant-rheology drilling fluid provided by the present invention, wherein the weight percent of each component is:
Wilkinite: 2.5%; Flow pattern control agent: 5%; Inhibitor: 3.5%; Fluid loss agent: 2%; Lubricant: 3%; Yellow soda ash: 0.3%; Sodium hydroxide: 0.1%; Wingdale: 15%; Seawater: surplus.
Comparative Examples:
Test the Comparative Examples of contrast with the present invention, wherein the weight percent of each component is:
Wilkinite: 3%; Fluid loss agent: 2%; XC:0.8%; Polymeric alcohol: 3%; KCL:17%; Yellow soda ash: 0.15%; Sodium hydroxide: 0.1%; Seawater: surplus.
Ocean deepwater water-based constant-rheology drilling fluid system performance table
Annotate:
T: the drilling fluid rheology probe temperature, ℃
AV: drilling fluid apparent viscosity, mPas
PV: drilling fluid plastic viscosity, mPas
YP: drilling fluid yield value, Pa
3: six fast rotational viscosimeters 3 of Φ turn reading, zero dimension
API: press in the drilling fluid dehydration (0.7MPa, room temperature, 30min), ml
Claims (4)
1. ocean deepwater water-based constant-rheology drilling fluid is characterized in that it consists of clay, flow pattern control agent, inhibitor, fluid loss agent, lubricant, pH adjusting agent, weighting agent, seawater; Wherein the weight percent of each component is:
Clay: 2--4%;
Flow pattern control agent: 3--8%;
Inhibitor: 2--5%;
Fluid loss agent: 1--3%;
Lubricant: 2--6%;
PH adjusting agent: 0.1--0.6%;
Weighting agent: 0--40%;
Seawater: surplus;
Described flow pattern control agent is a kind of water-soluble polymers of modification, and it is by AM, AA, AMPS, MAA, MA, N, and N-dimethacrylate, vinylbenzene acetate monomers cause by water soluble starter, are polymerized through multiple; Can use separately, also can composite a certain amount of xanthan gum, Rhizoma amorphophalli powder, CMC, polyacrylamide, HEC;
Described inhibitor is potassium acetate, potassium formiate, Repone K, calcium chloride, can use separately, also can compositely use;
Described fluid loss agent is sulfonated phenol formaldehyde resin, humic acid multi-element multipolymer, treated starch, can use separately, also can compositely use;
Described lubricant is polyoxyethylene stearic acid ester, polyvalent alcohol, polynary ether, can use separately, also can compositely use.
2. ocean deepwater water-based constant-rheology drilling fluid according to claim 1 is characterized in that described clay for wilkinite, attapulgite, sepiolite, saponite commonly used, can use separately, also can compositely use.
3. ocean deepwater water-based constant-rheology drilling fluid according to claim 1 is characterized in that described pH adjusting agent is sodium hydroxide, potassium hydroxide, sodium bicarbonate, yellow soda ash, can use separately, also can compositely use.
4. ocean deepwater water-based constant-rheology drilling fluid according to claim 1 is characterized in that described weighting agent is barite or Wingdale, can decide according to the density requirements of drilling fluid the dosage of weighting agent.
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| CN 201010161656 CN102234501B (en) | 2010-04-27 | 2010-04-27 | Ocean deepwater water-based constant-rheology drilling fluid |
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| CN 201010161656 CN102234501B (en) | 2010-04-27 | 2010-04-27 | Ocean deepwater water-based constant-rheology drilling fluid |
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| CN102234501A CN102234501A (en) | 2011-11-09 |
| CN102234501B true CN102234501B (en) | 2013-04-24 |
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| CN108009757B (en) * | 2017-12-28 | 2021-02-26 | 长江大学 | Method for predicting production of mud balls of drilling fluid |
| CN108165244B (en) * | 2018-02-07 | 2018-11-20 | 西南石油大学 | A kind of drilling fluid and preparation method thereof inhibiting surface of clay aquation |
| CN108276974B (en) * | 2018-02-10 | 2020-09-11 | 长江大学 | Deepwater constant-current transformation synthetic base drilling fluid |
| CN109054782B (en) * | 2018-08-03 | 2021-03-09 | 长江大学 | Thermo-sensitive polymer rheological regulator suitable for ocean and constant-current modified water-based drilling fluid |
| CN111423858A (en) * | 2019-01-09 | 2020-07-17 | 谢丽君 | High-temperature high-density seawater-based drilling fluid |
| CN111849435B (en) | 2020-07-15 | 2021-03-16 | 中国石油大学(北京) | Biodiesel-based constant-current-variable drilling fluid containing intelligent temperature response type polymer |
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Owner name: HUBEI JIANGHAN PETROLEUM TECHNIC CO., LTD. Free format text: FORMER OWNER: CHANGJING UNIVERSITY Effective date: 20130830 |
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Effective date of registration: 20130830 Address after: 434000 Jiangjin East Road, Hubei, Jingzhou Patentee after: Hubei Jianghan Petroleum Technic Co., Ltd. Address before: 434023 Jingzhou South Road, Hubei, No. 1 Patentee before: Yangtze University |