CN109944588A - High porosity reservoir containing soluble salt protects drilling fluid composition optimization method - Google Patents
High porosity reservoir containing soluble salt protects drilling fluid composition optimization method Download PDFInfo
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- CN109944588A CN109944588A CN201910210542.4A CN201910210542A CN109944588A CN 109944588 A CN109944588 A CN 109944588A CN 201910210542 A CN201910210542 A CN 201910210542A CN 109944588 A CN109944588 A CN 109944588A
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Abstract
It is rich in soluble salt porosity reservoir, drilling fluid leakage and formation damage problem serious phenomenon for boring to meet, the present invention provides a kind of drilling fluid reservoir protection performance optimization methods of consideration soluble salt dissolution.Method measures reservoir core throat distribution first, and carries out reduction salinity fluid displacement experiment step by step, specifies core permeability with the variation of fluid salinity, designs drilling fluid salinity on this basis.Secondly, rock core throat distribution after measurement salt is molten, is based on this, OPTIMIZATION OF DRILLING FLUID solid particle size distributes cloth, and guarantees solid phase maximum particle diameter slightly larger than reservoir maximum pore throat size.Drilling fluid is prepared, OPTIMIZATION OF DRILLING FLUID reservoir protection performance is evaluated by laboratory experiment.The present invention fully considers influence of the drilling fluid to the dissolution of reservoir soluble salt and its to RESERVOIR PORE STRUCTURE, optimization design drilling fluid salinity and solid phase material size distribution, protects work to provide foundation rich in soluble salt porosity reservoir to bore to meet.
Description
Technical field
The present invention relates to working solutions during oil and gas industry drilling completion to miss control and reservoir protection field,
This method uses the molten influence to pore type RESERVOIR PORE STRUCTURE of salt, optimize for live drilling fluid reservoir protection performance provide according to
According to.
Background technique
Global about 91% petroleum resource cities and nearly 80% natural gas resources derive from cream salt distribution basin or
Area.China's gypsum and salt rock formation is distributed mainly on Bohai Sea Gulf, Jiang-Han Area, the basins such as Tarim Basin and Qaidam.Under Yanyuan sufficiency,
The long-term dry cold ambient deposition process of experience, the reservoir positioned at such basin are generally rich in saline minerals, such as halite, feldspar, gypsum
Deng, low mineralization fluid erosion and impregnate under, saline minerals will dissolve.When boring chance gypsum-salt bed section, formation fluid overflows
Stream frequently occurs with drilling fluid leakage phenomenon, and formation damage problem is significant.Organic salt drilling fluid system is obtained when boring and meeting saline bed
To be widely used.
However, using organic salt/water base drilling fluid system brill open it is such rich in soluble salt reservoir when, if drilling fluid system mine
Change degree is lower, and filtrate causes soluble salt in reservoir to dissolve after contacting for a long time with reservoir.On the one hand, soluble salt dissolution improves
Reservoir properties have also been further exacerbated by drilling fluid leakage risk and leakage degree while increasing pore throat size and seepage flow space,
And drilling fluid leakage causes more low mineralization filtrate intrusion reservoirs, then promotes soluble salt dissolution, so as to form " drilling fluid
The vicious circle of leakage → saline minerals dissolution → drilling fluid leakage ".Also, under reservoir conditions, usually there are a large amount of indissoluble mines
Object is closely cementing by soluble salt and reservoir skeleton, after soluble salt dissolution, will lead to indissoluble mineral and falls off and migrate, plugging hole
Larynx reduces reservoir permeability, causes formation damage.Therefore, the dissolution characteristics of soluble salt are specified and to RESERVOIR PORE STRUCTURE
It influences, on this basis, OPTIMIZATION OF DRILLING FLUID reservoir protection performance is of great significance.
Summary of the invention
It is an object of that present invention to provide a kind of high porosity reservoirs containing soluble salt to protect drilling fluid composition optimization method, method
From the dissolution of soluble salt, the variation of reservoir core pore structure, the sides such as the design of drilling fluid salinity and solid particle size distribution are determining
Face has formulated dissolve OPTIMIZATION OF DRILLING FLUID reservoir protection performance method based on soluble salt in detail, to reservoir protection and drilling fluid leakage
Control has great importance.
To achieve the above objectives, the present invention is achieved through the following technical solutions:
(1) underground rock core is drilled through, obtains reservoir core with micro-analysis means such as Mercury-injection test, low-pressure nitrogen absorption methods
Pore throat size distribution；
(2) with Instrument measurings scene mud solid phase size distributions such as laser particle analyzers；
(3) carry out the positive differential pressure fluid displacement experiment that salinity reduces, measure rock core outlet end fluid stream with flowmeter
Amount calculates core permeability, and measures outlet end fluid conductivity with conductivity meter；
(4) measurement permeability relative deviation is greater than used displacement fluid salinity when 5% twice for record front and back, and straight
Stop experiment when not changing to rock core outlet end fluid conductivity；
(5) rock core takes out, dries after testing, and carries out Mercury-injection test, obtains rock core pore throat size point after soluble salt dissolves
Cloth；
(6) the rock core pore throat size that comparison step (1) and step (5) obtain is distributed, and specifies rock core pore throat character to solvable
The response of salt dissolution；
(7) rock core after the soluble salt dissolution of the mud solid phase size distribution of comparison step (2) measurement and step (5) measurement
Pore throat size distribution, clear scene drilling fluid reservoir protection ability；
(8) D is used90Rule chooses live reservoir protection material, guarantees that solid phase material granularity maximum gauge is about 1.2 times
Rock core maximum pore diameter after salt is molten；
(9) the fluid salinity according to step (4) record adjusts drilling fluid salinity, and reduction drilling process as far as possible bores
Solvability of the well liquid to reservoir soluble salt；
(10) by step (8), step (9), OPTIMIZATION OF DRILLING FLUID reservoir protection formula chooses reservoir core, carries out indoor
The experiment of rock core the dynamic damage, assesses rock core damage degree and permeability returns row's recovery situation.
The present invention and conventional drilling liquid reservoir protection optimization method project, have a characteristic that
(1) method considers drilling process reservoir soluble salt dissolution characteristics, and designs drilling fluid salinity with this, artificial to control
The dissolution degree of soluble salt processed can improve reservoir properties to a certain extent, and be unlikely to that more serious drilling fluid leakage occurs
It loses；
(2) influence to RESERVOIR PORE STRUCTURE, OPTIMIZATION OF DRILLING FLUID solid particle size distribution are dissolved based on soluble salt, and guaranteed
The matching relationship of reservoir maximum diameter of hole after material maximum particle diameter and salt are molten has more directive significance for site operation；
Detailed description of the invention
The molten front and back pore throat distribution curve of Fig. 1 reservoir core salt
Fig. 2 mud solid phase size distribution curve
Fig. 3 fluid displacement experiment flow figure
Specific embodiment
Content, feature and the effect that present invention be described in more detail with reference to the accompanying drawing, high reservoir protection containing soluble salt
Drilling fluid composition optimization method specific implementation step is as follows:
(1) underground rock core is drilled through, obtains reservoir core with micro-analysis means such as Mercury-injection test, low-pressure nitrogen absorption methods
Pore throat size is distributed (Fig. 1)；
(2) with Instrument measurings scene mud solid phase size distributions (Fig. 2) such as laser particle analyzers；
(3) carry out the positive differential pressure fluid displacement experiment that salinity reduces, measure rock core outlet end fluid stream with flowmeter
Amount calculates core permeability, and with conductivity meter measurement outlet end fluid conductivity (Fig. 3)；
(4) measurement permeability relative deviation is greater than used displacement fluid salinity when 5% twice for record front and back, and straight
Stop experiment when not changing to rock core outlet end fluid conductivity；
(5) rock core takes out, dries after testing, and carries out Mercury-injection test, obtains rock core pore throat size point after soluble salt dissolves
Cloth (Fig. 1)；
(6) the rock core pore throat size that comparison step (1) and step (5) obtain is distributed, and specifies rock core pore throat character to solvable
The response of salt dissolution；
(7) rock core after the soluble salt dissolution of the mud solid phase size distribution of comparison step (2) measurement and step (5) measurement
Pore throat size distribution, clear scene drilling fluid reservoir protection ability；
(8) D is used90Rule chooses live reservoir protection material, guarantees that solid phase material granularity maximum gauge is about 1.2 times
Rock core maximum pore diameter after salt is molten；
(9) the fluid salinity according to step (4) record adjusts drilling fluid salinity, and reduction drilling process as far as possible bores
Solvability of the well liquid to reservoir soluble salt；
(10) by step (8), step (9), OPTIMIZATION OF DRILLING FLUID reservoir protection formula chooses reservoir core, carries out indoor
The experiment of rock core the dynamic damage, assesses rock core damage degree and permeability returns row's recovery situation.
The present invention has fully considered that drilling process drilling fluid filtrate is molten to the dissolution of reservoir soluble salt and salt to reservoir hole
The influence of gap structure is based on the molten characteristic of reservoir salt, designs drilling fluid salinity, and combine the variation of RESERVOIR PORE STRUCTURE, optimization
Mud solid phase size distribution can provide directive significance for high reservoir protection containing soluble salt and leakage control.
Above-mentioned specific embodiment is described in detail method of the invention in conjunction with attached drawing, but the present invention is not
It is confined to above-mentioned specific embodiment, the above mentioned embodiment is only schematical, is not restrictive, ability
The those of ordinary skill in domain under the inspiration of the present invention, if in without departing from main scope of the invention, can be to experiment condition
It is flexibly changed with analysis method and object, within these are all belonged to the scope of protection of the present invention.
Claims (1)
1. high porosity reservoir containing soluble salt protects drilling fluid composition optimization method, it is characterised in that:
(1) underground rock core is drilled through, obtains reservoir core pore throat with micro-analysis means such as Mercury-injection test, low-pressure nitrogen absorption methods
Size distribution；
(2) with Instrument measurings scene mud solid phase size distributions such as laser particle analyzers；
(3) carry out the positive differential pressure fluid displacement experiment that salinity reduces, measure rock core outlet end fluid flow, meter with flowmeter
Core permeability is calculated, and measures outlet end fluid conductivity with conductivity meter；
(4) measurement permeability relative deviation is greater than used displacement fluid salinity when 5%, and until rock twice for record front and back
Stop experiment when heart outlet end fluid conductivity does not change；
(5) rock core takes out, dries after testing, and carries out Mercury-injection test, obtains rock core pore throat size after soluble salt dissolves and is distributed；
(6) the rock core pore throat size that comparison step (1) and step (5) obtain is distributed, and it is molten to soluble salt to specify rock core pore throat character
The response of solution；
(7) rock core pore throat after the soluble salt dissolution of the mud solid phase size distribution of comparison step (2) measurement and step (5) measurement
Size distribution, clear scene drilling fluid reservoir protection ability；
(8) D is used90Rule chooses live reservoir protection material, guarantees that solid phase material granularity maximum gauge is after 1.2 times of salt are molten
Rock core maximum pore diameter；
(9) the fluid salinity according to step (4) record adjusts drilling fluid salinity, as far as possible reduction drilling process drilling fluid
To the solvability of reservoir soluble salt；
(10) by step (8), step (9), OPTIMIZATION OF DRILLING FLUID reservoir protection formula chooses reservoir core, carries out laboratory core
The dynamic damage experiment, assesses rock core damage degree and permeability returns row's recovery situation.
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Cited By (3)
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| CN113504171A (en) * | 2021-07-13 | 2021-10-15 | 西南石油大学 | Device and method for measuring reservoir salt deposition damage and evaluating salt dissolving agent effect |
| CN113655082A (en) * | 2021-10-15 | 2021-11-16 | 西南石油大学 | Optimization method for evaluating well-entering fluid of tight shale reservoir |
| CN116378644A (en) * | 2022-12-14 | 2023-07-04 | 常州大学 | Method for optimizing reservoir protection formula of salty lake-phase carbonate drilling fluid |
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| CN113504171B (en) * | 2021-07-13 | 2024-04-16 | 西南石油大学 | Device and method for measuring reservoir salt precipitation injury and evaluating salt dissolving agent effect |
| CN113655082A (en) * | 2021-10-15 | 2021-11-16 | 西南石油大学 | Optimization method for evaluating well-entering fluid of tight shale reservoir |
| CN116378644A (en) * | 2022-12-14 | 2023-07-04 | 常州大学 | Method for optimizing reservoir protection formula of salty lake-phase carbonate drilling fluid |
| CN116378644B (en) * | 2022-12-14 | 2024-04-05 | 常州大学 | Method for optimizing reservoir protection formula of salty lake-phase carbonate drilling fluid |
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Application publication date: 20190628 |