CN107014746A - A kind of evaluation method of broken formation drilling fluid Reinforcing Shaft ability - Google Patents
A kind of evaluation method of broken formation drilling fluid Reinforcing Shaft ability Download PDFInfo
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- CN107014746A CN107014746A CN201710199762.2A CN201710199762A CN107014746A CN 107014746 A CN107014746 A CN 107014746A CN 201710199762 A CN201710199762 A CN 201710199762A CN 107014746 A CN107014746 A CN 107014746A
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- sillar
- drilling fluid
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- rock sample
- reinforcing shaft
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- General Health & Medical Sciences (AREA)
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
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Abstract
The invention discloses a kind of evaluation method of broken formation drilling fluid Reinforcing Shaft ability, the sillar of certain size is cut from the sillar of broken formation, it is polished pretreatment, it is fixed after two certain thickness steel discs by being added between two pieces of sillar burnishing surface edges, coefficient of friction under last test drilling fluid wetting conditions between sillar, according to coefficient of maximum static friction come the ability of appraisal drilling liquid Reinforcing Shaft；The present invention considers formation temperature, drilling well pressure difference, actual well drilled liquid soak time and formation fracture width conditions, more truly simulates friction behavior between the sillar fracture surface containing drilling fluid filter cake；The present invention, come the ability of appraisal drilling liquid Reinforcing Shaft, more scientifically reflects the catastrophe characteristicses of broken formation borehole well instability according to the coefficient of maximum static friction between the sillar of broken formation two；It is the development of caving-preventing sloughing drilling fluid system with preferably offering reference the invention provides a kind of new approaches of drilling fluid Reinforcing Shaft merit rating.
Description
Technical field
The present invention relates to oil and gas well drilling technical field, and in particular to the drilling well of broken formation stabilizing borehole ability
Liquid evaluation method.
Background technology
Broken formation refers under external force, the rock mass with Crushing Mechanics behavior and physical mechanism, comprising tomography,
A variety of plane of weakness structures such as cleavage, crack.Most common broken formation is low intensive brittle rock such as coal seam, rammell, stone
Limestone, some dolomites etc..When boring this kind of stratum of chance, hole collapse situation is often extremely serious, when not only wasting a large amount of drilling wells
Between and material, cause drilling cost to rise rapidly, and influence later stage operation quality.
Rupture is the exclusive mechanism destroyed in intact rock, if rock has Weak face, such as already present tomography, layer
The plane of weakness structure such as reason face, the main mechanism that rock is destroyed then is turned into along the Frictional Slipping of Weak face.Slided along the friction of plane of weakness
Dynamic is the major way that broken formation rock is further moved.Coefficient of friction is smaller between the plane of disruption, easier between sillar to occur
Frictional Slipping, the easier unstability of the borehole wall.
Because the bearing capacity of broken formation is low, the lower filtrate of drilling well liquid columnpressure fluctuation is easily invaded along catalase face
Enter stratum, the liquid phase of intrusion can infiltrate the plane of disruption, coefficient of friction is reduced between causing the plane of disruption, induces borehole well instability.Between the plane of fracture
Coefficient of friction, especially confficient of static friction between the lower plane of disruption of drilling fluid infiltration is to influence the pass of broken formation wellbore stability
Key factor, but currently for the existing method of drilling fluid Reinforcing Shaft performance evaluation, mainly pressed down by the aquation of appraisal drilling liquid
Property processed, is not directed to by testing the coefficient of friction between catalase face come preferred drilling fluid.Therefore, by testing drilling well immersion
Coefficient of friction between mild laxation broken formation catalase face, is a kind of new method of appraisal drilling liquid Reinforcing Shaft ability,
It is also a kind of effective ways for possessing live operability.
The content of the invention
It is an object of the invention to provide a kind of evaluation method of broken formation drilling fluid Reinforcing Shaft ability, this method
By testing the friction coefficient curve between the lower broken formation catalase face of drilling fluid infiltration, according to the catalase face measured
Between coefficient of maximum static friction carry out the Reinforcing Shaft performance of appraisal drilling liquid.
This method can be used in evaluating the size of broken formation drilling fluid Reinforcing Shaft ability, the aquation suppression of collaboration drilling fluid
Property evaluation method processed, can be the foundation for being preferably provided with effect of caving-preventing sloughing drilling fluid system.
To achieve the above objectives, the present invention provides following technical scheme.
A kind of evaluation method of broken formation drilling fluid Reinforcing Shaft ability, it is characterised in that comprise the following steps：
(1) sillar of certain size is cut from the sillar of broken formation, with certain mesh number sand paper or emery wheel to sillar
Surface, which is polished after pretreatment, is dried, weighs, and edge between two pieces of sillar burnishing surfaces is added after two certain thickness steel discs
It is fixed, it is used as experiment rock sample；
(2) to drilling fluid to be evaluated, heat is rolled at the formation temperature；
(3) it will test that rock sample is placed in the vessel, the drilling fluid in step (2) is injected in container, drilling liquid is flooded
The contact interface between sillar is not tested；
(4) drilling well pressure difference is simulated, applies certain pressure in container, rock sample soaks the regular hour in drilling fluid
Afterwards, steel disc between the experiment sillar burnishing surface of rock sample two is taken out, and tests two sillar weight；
(5) the relatively upper and lower placement of the sillar burnishing surface of rock sample two will be tested, in friction coefficient instrument, friction system is utilized
Number instrument tests frictional force versus time curve between two sillar burnishing surfaces；
(6) the rock sample frictional force measured according to step (5) changes over time the weight data of curve and top sillar, root
Carry out the ability of appraisal drilling liquid Reinforcing Shaft according to the coefficient of maximum static friction measured.
Described rock sample soaked in drilling fluid the regular hour be according to during actual well drilled drilling time determine.
Compared with prior art, this method has the advantages that：
(1) simulated formation temperature, drilling well pressure difference, actual well drilled liquid soak time and formation fracture width conditions, more
Truly simulate friction behavior between the sillar fracture surface containing drilling fluid filter cake；
(2) according to the coefficient of maximum static friction between two sillars come the ability of appraisal drilling liquid Reinforcing Shaft, more science
Ground reflects the catastrophe characteristicses of broken formation borehole well instability；
(3) a kind of thinking of new drilling fluid Reinforcing Shaft merit rating is provided, is the development of caving-preventing sloughing drilling fluid system
With preferably offering reference；
(4) operating procedure is simple, and financial cost is low.
Brief description of the drawings
Fig. 1 is present invention experiment rock sample；
Fig. 2 is time and friction under shale rock sample of the present invention is infiltrated with oil base with water base two kinds of drilling fluid systems at the scene
Relationship of Coefficients curve；
Fig. 3 is the chip off-falling occurred and the detritus sample that collapses in onsite application oil base drilling fluid drilling process.
Embodiment
In order to which technical characteristic, purpose and beneficial effect to the present invention are more clearly understood from, with reference to accompanying drawing to this hair
Bright one embodiment is further described.Embodiment is served only for that the present invention is further detailed, it is impossible to be interpreted as pair
The limitation of the scope of the present invention, those skilled in the art made according to present disclosure some it is nonessential improvement and
Adjustment falls within the scope of protection of the invention.
Embodiment 1
It is experiment rock sample, drilling well using typical broken formation-richness organic shale for the reliability of the checking present invention
Liquid is the oil base and water-base drilling fluid at Sichuan Basin shale block scene, has carried out the lower shale plane of disruption of drilling fluid infiltration and has rubbed
Coefficient test experiments are wiped, the ability that live drilling fluid reinforces the shale borehole wall is have rated.Concrete operation step is as follows：
A, selection Chongqing City Peng River county magistrate beach township Longma small stream group appear shale to test rock sample, drill through a diameter of 25.4mm's
Rock core plunger, is cut rock core using wire cutting lathe in the axial direction, and then will cut face using 1000 mesh abrasive paper for metallograph beats
Grinding and polishing light.Edge of the narrow steel disc pad of glue between two burnishing surfaces will be scribbled, and the rock core cut is closed up, compress with
The crack rock sample with fixed slit width degree is made, accompanying drawing 1 is seen；
B, oil base and water-base drilling fluid from Sichuan Basin shale block scene, carry out the heat under the conditions of 70 DEG C
Rolling；
C, will to test rock sample placed in the vessel, and drilling fluid is injected in container, make drilling liquid flood experiment sillar it
Between contact interface；
D, simulation drilling well pressure difference, apply 3.5MPa pressure, rock sample is soaked after 7d in drilling fluid, will test rock in container
Steel disc takes out between the sillar burnishing surface of sample two, and tests two sillar weight；
E, will experiment rock sample two sillar burnishing surface is relatively upper and lower places, in friction coefficient instrument, utilize coefficient of friction
Instrument tests frictional force versus time curve between two sillar burnishing surfaces
The rock sample frictional force that f, basis are measured changes over time the weight data of curve and top sillar, according to what is measured
Coefficient of maximum static friction (Fig. 2), carrys out the ability of appraisal drilling liquid Reinforcing Shaft.
Experimental result is shown：The coefficient of maximum static friction average out to 0.69 of rock sample is dried, compared with drying regime, fluid leaching
Profit reduces the coefficient of friction of the rich organic shale plane of disruption, and rock sample is maximum quiet under water-base drilling fluid, oil base drilling fluid infiltration
Coefficient of friction is respectively 0.59,0.51, and the coefficient of maximum static friction fall of the lower rock sample of oil base drilling fluid infiltration is bigger.With water
Base drilling fluid is compared, and is more easy to generation Frictional Slipping after the intrusion of oil base drilling fluid between the shale plane of disruption.Live drilling well is shown, is used
The chip off-falling scene of collapsing is extremely serious during oil base drilling fluid drilling well, further demonstrate the reliability of the present invention.See accompanying drawing 3.
To sum up, the present invention can have synergy with drilling fluid sealing characteristics evaluation method, be commented in drilling fluid sealing characteristics
The lower broken formation rock frictional test coefficient test of drilling fluid infiltration is carried out on the basis of valency, can the preferred of more science anti-collapse bore
Well liquid system.
Claims (2)
1. a kind of evaluation method of broken formation drilling fluid Reinforcing Shaft ability, it is characterised in that comprise the following steps：
(1) sillar of certain size is cut from the sillar of broken formation, with certain mesh number sand paper or emery wheel to sillar surface
It is polished after pretreatment and dries, weighs, edge between two pieces of sillar burnishing surfaces is added after two certain thickness steel discs and fixed,
It is used as experiment rock sample；
(2) to drilling fluid to be evaluated, heat is rolled at the formation temperature；
(3) it will test that rock sample is placed in the vessel, the drilling fluid in step (2) is injected in container, drilling liquid is flooded reality
The contact interface tested between sillar；
(4) drilling well pressure difference is simulated, applies certain pressure in container, rock sample is soaked after the regular hour in drilling fluid, will
Steel disc takes out between testing the sillar burnishing surface of rock sample two, and tests two sillar weight；
(5) the relatively upper and lower placement of the sillar burnishing surface of rock sample two will be tested, in friction coefficient instrument, friction coefficient instrument is utilized
Test frictional force versus time curve between two sillar burnishing surfaces；
(6) the rock sample frictional force measured according to step (5) changes over time the weight data of curve and top sillar, according to survey
The coefficient of maximum static friction obtained carrys out the ability of appraisal drilling liquid Reinforcing Shaft.
2. the evaluation method of broken formation drilling fluid Reinforcing Shaft ability according to claim 1, it is characterised in that：Institute
The rock sample stated soaked in drilling fluid the regular hour be according to during actual well drilled drilling time determine.
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| CN201710199762.2A CN107014746A (en) | 2017-03-30 | 2017-03-30 | A kind of evaluation method of broken formation drilling fluid Reinforcing Shaft ability |
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| CN201710199762.2A CN107014746A (en) | 2017-03-30 | 2017-03-30 | A kind of evaluation method of broken formation drilling fluid Reinforcing Shaft ability |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653736A (en) * | 2017-10-11 | 2019-04-19 | 中国石油化工股份有限公司 | A kind of experimental provision and method for appraisal drilling liquid caving-preventing characteristic |
| WO2021077938A1 (en) * | 2019-10-26 | 2021-04-29 | 西南石油大学 | Method of evaluating capability of drilling fluid to consolidate well wall and break surrounding rock |
| CN113034001A (en) * | 2021-03-24 | 2021-06-25 | 西南石油大学 | Evaluation data processing method and system based on underground engineering parameters |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198377A (en) * | 2016-07-07 | 2016-12-07 | 中国石油集团川庆钻探工程有限公司 | Method for evaluating lubricity of water-based drilling fluid |
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2017
- 2017-03-30 CN CN201710199762.2A patent/CN107014746A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198377A (en) * | 2016-07-07 | 2016-12-07 | 中国石油集团川庆钻探工程有限公司 | Method for evaluating lubricity of water-based drilling fluid |
Non-Patent Citations (3)
| Title |
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| J.L.吉德利: "《水力压裂技术新发展》", 31 December 1995, 石油工业出版社 * |
| 康毅力 等: "油基钻井完井液对页岩储层保护能力评价", 《钻井工程》 * |
| 康毅力 等: "钻井完井液浸泡弱化页岩脆性机制", 《力学学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653736A (en) * | 2017-10-11 | 2019-04-19 | 中国石油化工股份有限公司 | A kind of experimental provision and method for appraisal drilling liquid caving-preventing characteristic |
| WO2021077938A1 (en) * | 2019-10-26 | 2021-04-29 | 西南石油大学 | Method of evaluating capability of drilling fluid to consolidate well wall and break surrounding rock |
| CN113034001A (en) * | 2021-03-24 | 2021-06-25 | 西南石油大学 | Evaluation data processing method and system based on underground engineering parameters |
| CN113034001B (en) * | 2021-03-24 | 2022-03-22 | 西南石油大学 | Evaluation data processing method and system based on underground engineering parameters |
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Application publication date: 20170804 |