CN105445365A - Drilling fluid plugging performance evaluation method - Google Patents
Drilling fluid plugging performance evaluation method Download PDFInfo
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- CN105445365A CN105445365A CN201410501704.7A CN201410501704A CN105445365A CN 105445365 A CN105445365 A CN 105445365A CN 201410501704 A CN201410501704 A CN 201410501704A CN 105445365 A CN105445365 A CN 105445365A
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Abstract
The invention provides a drilling fluid plugging performance evaluation method. Rock core slices are soaked in drilling fluid under high temperature and high pressure conditions to simulate the plugging condition of the drilling fluid to stratum rock, then a CWT-200 sonic wave tachymeter is employed to determine the relative rock strength of the rock core slices, thereby reflecting the plugging performance of the drilling fluid. The method provided by the invention has the advantages of short experimental period, strong operability, simple experimental procedure and portable equipment, can be used for experimental study indoors, and also can be used for evaluation of the drilling fluid performance at a drilling site. The method provided by the invention can well simulate the plugging condition of the drilling fluid to stratum rock, has more real evaluation effect, and has stronger guidance on drilling construction.
Description
Technical field
The present invention relates to drilling liquid performance evaluating method in petroleum prospecting, be specifically related to a kind of drilling fluid sealing characteristics evaluation method.
Background technology
Mud shale microfracture is one of major reason causing slump in.After mud shale meets water, due to capillarity, water invades rock along microfracture, produces hydration, mud shale is disperseed, thus causes the unstability of the borehole wall.Therefore, when mud shale stratum drilling well, be necessary the shut-off capacity strengthening drilling fluid, improve microfracture plugging effect.
In indoor, the shut-off capacity of drilling fluid is evaluated, specific aim and the result of use of rig-site utilization can be improved.At present, the method for domestic appraisal drilling liquid sealing characteristics has a variety of.As used FA type non-infiltration drilling fluid filtration device comparatively widely, this experiment instrument as experiment cylinder at the organic clear glass of use, is intuitively measured mud filtrate by nitrogen pressurization and is invaded the simulation sill degree of depth.Experiment condition is normal temperature, middle pressure 0.69MPa.The manual measurement mud filtrate intrusive sheet degree of depth, experiment is directly perceived, simple, function singleness.Propose in " oilfield chemistry " the 4th phase in 1999 " broken formation anti-caving agent for drilling fluid evaluation method and application " to use the dynamic filter press of a kind of High Temperature High Pressure, use the artificial cores of certain pore throat, determine the shut-off capacity of mud cake by surveying filter loss, experiment core can not be reused.And for example Xu Tongtai etc. propose to adopt high temperature and high pre ssure filtration analyzer in " evaluation method of drilling fluid blocking agent and influence factor ", measure drilling fluid HTHP filter loss, HTHP infiltration dehydration, HTHP Sand bed filtration and HTHP casting bed dehydration four indexs and carry out the plugging effect of appraisal drilling liquid (see " Drilling and completion fluids ", 2009,26(2)).Yue Qiansheng etc. propose to use hypotonic synthetic core shutoff experiment in " the sealing characteristics research and apply of oil base drilling fluid ", calculate sealing ratiod and evaluate plugging effect (see " Drilling and completion fluids ", 2006,23(5)).Publication number 101109739 patent discloses a kind of bearing strength experiment instrument of high-temperature high-pressure mud cake plugging.Publication number 103048090A patent discloses a kind of core permeability instrument that uses to evaluate the evaluation method of sealing ratiod.
Shortcoming or the deficiency of these technology are: 1. most is more complicated relatively large instrument, and experimental implementation is more loaded down with trivial details, and experimental period is long, is suitable for desk research, can not carry out experimental evaluation at situ of drilling well; 2. most evaluation appts for crack plugging effect, do not specialize in microfracture (crack of fracture width below 100 microns or 150 microns) plugging effect, evaluation effect has certain limitation.3. drilling fluid HTHP filter loss, HTHP permeate the shutoff situation that the indexs such as dehydration all can not simulate drilling fluid really, and evaluation effect is limited.
Summary of the invention
The object of the invention is the deficiency overcoming above-mentioned technology, there is provided one can carry out evaluating (as rock fracture shutoff, hole shutoff) for general drilling fluid sealing characteristics, can evaluate for mud shale stratum microfracture plugging effect again, improve the applicability of evaluation method and the drilling fluid sealing characteristics evaluation method of simplicity.
Technical scheme of the present invention is achieved in that
A kind of drilling fluid seal-off effect evaluation method, is characterized in that the sound wave transfer rate of the slabbed core after utilizing acoustic speedometer mensuration mud soak, thus investigates the sealing characteristics of drilling fluid.
Concrete implementation step according to such scheme comprises:
1. same rock core is cut into slices, numbered, measure rock core height and length, the air of emptying rock core.
2. under the rock core handled well being put into the fluid strainer of the high temperature and high pre ssure filtration analyzer filling drilling fluid, be warming up to 150 DEG C, being forced into 4.1MPa, static 6-10h.
3., after removal of core, cleaning core surface sediment, then acoustic speedometer is measured sound wave transfer rate;
4. by the sound wave transfer rate result of several different drilling fluid, the height of drilling fluid to reservoir core plugging effect is compared.
Such scheme also comprises:
Step (1) puts rock core the air finding time in aqueous to remove in rock sample; The amount of the drilling fluid filled in step (2) fluid strainer must can envelope rock core, forms mud soak.
Described high temperature and high pre ssure filtration analyzer is 42 type high temperature and high pre ssure filtration analyzers; Described acoustic speedometer is CWT-200 acoustic speedometer.
Heat up by the requirement of standard industry standard SY/T5621-93 in step (2), pressurize.
The mechanism of the method is as follows: by the immersion of slabbed core in drilling fluid under high-temperature and high-pressure conditions, simulate the shutoff situation of drilling fluid formation rock, then utilize CWT-200 acoustic speedometer to measure the relative rock strength of slabbed core, thus reflect the sealing characteristics of drilling fluid.
Tool of the present invention has the following advantages:
1. experimental period of the present invention is short, workable, and experimentation is simple, and device is convenient for carrying, and indoorly can be used for experimental study, also can be used for appraisal drilling fluidity energy at situ of drilling well, applicability is strong.
2. the present invention can simulate the shutoff situation of drilling fluid formation rock preferably, and evaluation effect is more true, stronger to the directiveness of wellbore construction.
3. the present invention has considered rock microfracture, shutoff situation compared with large fracture and hole, and usable range is wider.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Integrated embodiment 1
Drilling fluid sealing characteristics evaluation method mainly utilizes a sound wave transfer rate for the slabbed core after CWT-200 acoustic speedometer mensuration mud soak, thus investigates the sealing characteristics of drilling fluid.
The implementation step of the method is as follows:
1. same rock core is cut into slices, numbered, measure rock core height and length, rock core is placed in formation water the air finding time to remove in rock sample.
2. the rock core handled well is put into the high temperature and high pre ssure filtration analyzer fluid strainer filling drilling fluid, heats up by standard program, pressurization, at 150 DEG C, static 8h under 4.1MPa.
3., after removal of core, cleaning core surface sediment, then measures sound wave transfer rate on CWT-200 acoustic speedometer.
4. by the sound wave transfer rate result of several different drilling fluid, the height of drilling fluid to reservoir core plugging effect can be compared.
Specific embodiment 2:
1. same rock core is cut into slices, numbered, measure rock core height and length, rock core is placed in formation water the air finding time to remove in rock sample.
2. the rock core handled well is put into respectively the 42 type high temperature and high pre ssure filtration analyzer fluid strainers filling drilling fluid A and drilling fluid B, heat up by standard program, pressurize (see industry standard SY/T5621-93), at 150 DEG C, static 8h(experimental session under 4.1MPa, analyzer lower valve rod is closed always).
3., after removal of core, cleaning core surface sediment, then measures sound wave transfer rate on CWT-200 acoustic speedometer.
Experimental result is as follows:
The sound wave transfer rate of drilling fluid A is 15389m/s, and the sound wave transfer rate of drilling fluid B is 13406m/s.As can be seen from the results, drilling fluid B is to strong than drilling fluid A of the seal-off effect of rock.
Specific embodiment 3:
1. same rock core is cut into slices, numbered, measure rock core height and length, rock core is placed in formation water the air finding time to remove in rock sample.
2. the rock core handled well is put into respectively the 42 type high temperature and high pre ssure filtration analyzer fluid strainers filling drilling fluid C and drilling fluid D, heat up by standard program, pressurize (see industry standard SY/T5621-93), 150 DEG C, static 8h(experimental session under 4.1MPa, analyzer lower valve rod is closed always).
3., after removal of core, cleaning core surface sediment, then measures sound wave transfer rate on CWT-200 acoustic speedometer.
Experimental result is as follows:
The sound wave transfer rate of drilling fluid C is 9030m/s, and the sound wave transfer rate of drilling fluid D is 12627m/s.As can be seen from the results, drilling fluid C is to strong than drilling fluid D of the seal-off effect of rock.
Wherein, CWT-200 acoustic speedometer device, primarily of main frame and core holding unit, computing machine composition, is the instrument using continuous wave technology small samples to be carried out to ultrasonic velocity measurement, can according to the speed recorded, the mechanical characteristic of assessment well drilling detritus.Be positioned in core holding unit by smooth for rock core sample, transmit wave of compression or polarization shearing wave by sonac parts, data acquisition system (DAS) is carried out Data Collection arrangement and is calculated sound wave transfer rate.
Claims (5)
1. a drilling fluid seal-off effect evaluation method, is characterized in that the sound wave transfer rate of the slabbed core after utilizing acoustic speedometer mensuration mud soak, thus investigates the sealing characteristics of drilling fluid.
2. drilling fluid seal-off effect evaluation method according to claim 1, is characterized in that comprising:
1. same rock core is cut into slices, is numbered, measure rock core height and length, the air of emptying rock core,
2. under the rock core handled well being put into the fluid strainer of the high temperature and high pre ssure filtration analyzer filling drilling fluid, be warming up to 150 DEG C, being forced into 4.1MPa, static 6-10h,
3., after removal of core, cleaning core surface sediment, then acoustic speedometer is measured sound wave transfer rate,
4. by the sound wave transfer rate result of several different drilling fluid, the height of drilling fluid to reservoir core plugging effect is compared.
3. drilling fluid seal-off effect evaluation method according to claim 2, is characterized in that, step (1) puts rock core the air finding time in aqueous to remove in rock sample; The amount of the drilling fluid filled in step (2) fluid strainer must can envelope rock core, forms mud soak.
4. drilling fluid seal-off effect evaluation method according to claim 3, is characterized in that, described high temperature and high pre ssure filtration analyzer is 42 type high temperature and high pre ssure filtration analyzers; Described acoustic speedometer is CWT-200 acoustic speedometer.
5. the drilling fluid seal-off effect evaluation method according to Claims 2 or 3,4, is characterized in that, heats up, pressurizes in step (2) by the requirement of standard industry standard SY/T5621-93.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198871A (en) * | 2016-07-07 | 2016-12-07 | 中国石油集团川庆钻探工程有限公司 | A kind of evaluation methodology of water-base drilling fluid seal-off effect |
| CN108240950A (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 method for the evaluation of drilling fluid sealing characteristics |
| CN108362860A (en) * | 2018-02-08 | 2018-08-03 | 中国石油天然气股份有限公司 | A kind of tight sand turnaround fracture feasibility indoor test method |
| CN110082271A (en) * | 2018-01-26 | 2019-08-02 | 中石化石油工程技术服务有限公司 | A kind of drilling fluid nano particle closure effect evaluation method |
| CN111855484A (en) * | 2020-07-30 | 2020-10-30 | 西南石油大学 | Method for evaluating well wall capability of drilling fluid for stabilizing shale formation based on acoustoelectric response |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198871A (en) * | 2016-07-07 | 2016-12-07 | 中国石油集团川庆钻探工程有限公司 | A kind of evaluation methodology of water-base drilling fluid seal-off effect |
| CN108240950A (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 method for the evaluation of drilling fluid sealing characteristics |
| CN110082271A (en) * | 2018-01-26 | 2019-08-02 | 中石化石油工程技术服务有限公司 | A kind of drilling fluid nano particle closure effect evaluation method |
| CN108362860A (en) * | 2018-02-08 | 2018-08-03 | 中国石油天然气股份有限公司 | A kind of tight sand turnaround fracture feasibility indoor test method |
| CN108362860B (en) * | 2018-02-08 | 2021-04-30 | 中国石油天然气股份有限公司 | Indoor testing method for tight sandstone steering fracturing feasibility |
| CN111855484A (en) * | 2020-07-30 | 2020-10-30 | 西南石油大学 | Method for evaluating well wall capability of drilling fluid for stabilizing shale formation based on acoustoelectric response |
| CN111855484B (en) * | 2020-07-30 | 2022-05-20 | 西南石油大学 | Method for evaluating drilling fluid stable shale stratum well wall capability based on acoustoelectric response |
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Application publication date: 20160330 |