CN205263050U

CN205263050U - Experimental device for simulation drilling fluid is missed in crack of stratum

Info

Publication number: CN205263050U
Application number: CN201520912813.8U
Authority: CN
Inventors: 何冠韬; 贾永禄; 聂仁仕; 彭立帆
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2015-11-17
Filing date: 2015-11-17
Publication date: 2016-05-25
Anticipated expiration: 2025-11-17

Abstract

The utility model relates to an experimental device for simulation drilling fluid is missed in crack of stratum mainly comprises confined pressure bottle, nitrogen cylinder, manometer, seal baffle, stock solution room, drilling fluid import, confined pressure table, crack control thin slice, rock core holder, fixation nut, flowmeter, graduated flask. The nitrogen gas of the certain pressure of nitrogen cylinder output promotes seal baffle and removes right to the indoor drilling fluid of extrusion stock solution gets into the rock core holder, and the rock core of confined pressure bottle in to the rock core holder provides the confined pressure of a sizing simultaneously, the drilling fluid under the drive of pressure, rock core crack along the rock core holder in, outflow rock core holder flows into the graduated flask at last. Through adjusting confined pressure bottle and nitrogen cylinder delivery pressure size and crack control thin slice thickness, can simulate the leakage of drilling fluid in different pit shaft pressure, different formation pressure, different fracture width. The utility model discloses an advantage: simple structure, convenient operation can effectively simulate the leakage of drilling fluid in the crack of stratum.

Description

A kind ofly simulate the experimental provision that drilling fluid is missed in formation fracture

Technical field

The utility model relates to conventional drilling liquid drilling technology field, relates more specifically to a kind of experimental provision that drilling fluid is missed in formation fracture of simulating.

Background technology

Generally grow in a lot of oil gas field tomographies of China and crack, and leakage phenomena often occurs in this area thus, brings severe challenge to drillng operation, and how effectively simulation fracture formation leakage is a generality difficult problem. Statistics shows, in oil drilling process, the expense of fractured reservoir leakproof, leak stopping accounts for the more than 90% of various stratum total cost, thereby it is great to solve the leakage question meaning of fractured reservoir. Research discovery, if know size and the character of original place fracture width, the selection meeting of leakage stopping technology and leakage-stop liquid formula is more targeted, can increase substantially leak stopping one-time success rate. Therefore,, if can invent a kind of experimental provision that drilling fluid is missed in formation fracture of simulating, be conducive to study the impact of Fractured confrontation drilling fluid leakage.

Summary of the invention

The utility model object is: a kind of experimental provision that drilling fluid is missed in formation fracture of simulating is provided.

The technical scheme that the utility model adopts is:

The utility model is a kind of simulates the experimental provision that drilling fluid is missed in formation fracture, is mainly made up of nitrogen cylinder A, nitrogen cylinder B, Pressure gauge A, sealing baffle, fluid reservoir, drilling fluid import, Pressure gauge B, Crack Control thin slice, core holding unit, hold-down nut, flowmeter, graduated cylinder. Nitrogen cylinder A is connected with core holding unit, Pressure gauge B is arranged between nitrogen cylinder A and core holding unit, nitrogen cylinder A is connected with fluid reservoir, there is a sealing baffle fluid reservoir inside, fluid reservoir upper end connects drilling fluid import, fluid reservoir is connected with core holding unit left end, core holding unit is the two parts up and down that have inner chamber, Crack Control thin slice is installed in the middle of core holding unit, core holding unit is fixed by hold-down nut, core holding unit right-hand member connects drilling fluid outlet, and drilling fluid exit is provided with flowmeter. Drilling fluid enters fluid reservoir by drilling fluid import, the nitrogen of nitrogen cylinder B output certain pressure promotes sealing baffle and moves, thereby the drilling fluid in extruding fluid reservoir enters core holding unit, nitrogen cylinder A provides a certain size confined pressure to the rock core in core holding unit simultaneously, drilling fluid is under the driving of pressure, along the rock core crack in core holding unit, flow out core holding unit, finally flow into graduated cylinder. Pressure gauge A and Pressure gauge B show respectively the pressure of nitrogen cylinder B and nitrogen cylinder A output, and Crack Control thin slice is used for regulating fracture width, and the mud flow rate of core holding unit is flowed out in flowmeter monitoring. By regulating nitrogen cylinder A and nitrogen cylinder B output pressure size and Crack Control sheet thickness, can simulate the leakage of drilling fluid in different wellbore pressures, Different Strata pressure, different crack.

Advantage of the present utility model: simple in structure, easy to operate, can effectively simulate the leakage of drilling fluid in formation fracture.

Brief description of the drawings

Fig. 1 is a kind of structural representation of simulating the experimental provision that drilling fluid misses in formation fracture of the utility model.

In figure: 1. nitrogen cylinder A, 2. nitrogen cylinder B, 3. Pressure gauge A, 4. sealing baffle, 5. fluid reservoir, 6. drilling fluid import, 7. Pressure gauge B, 8. Crack Control thin slice, 9. core holding unit, 10. hold-down nut, 11. flowmeters, 12. graduated cylinders.

Detailed description of the invention

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 1, the utility model is a kind of simulates the experimental provision that drilling fluid is missed in formation fracture, is mainly made up of nitrogen cylinder A1, nitrogen cylinder B2, Pressure gauge A3, sealing baffle 4, fluid reservoir 5, drilling fluid import 6, Pressure gauge B7, Crack Control thin slice 8, core holding unit 9, hold-down nut 10, flowmeter 11, graduated cylinder 12. Described nitrogen cylinder A1 is for providing the confined pressure of core holding unit 9 interior rock cores. Nitrogen cylinder B2 provides pressure and promotes sealing baffle 4 for sealing baffle 4, and sealing baffle 4 pushes by drilling fluid import 6 and enters into the drilling fluid in fluid reservoir 5, and drilling fluid enters core holding unit 9. Core holding unit 9 is for clamping post-fracturing rock core, Crack Control thin slice 8 is for regulating the Size of Crack between rock core, hold-down nut 10 seals fixing to core holding unit 9, Pressure gauge B7 and Pressure gauge A3 show respectively the pressure of nitrogen cylinder A1 and nitrogen cylinder B2 output, Crack Control thin slice 8 is for regulating fracture width, and the mud flow rate of core holding unit 9 is flowed out in flowmeter 11 monitorings. Drilling fluid enters fluid reservoir 5 by drilling fluid import 6, under the pressure-acting providing at nitrogen cylinder B2, sealed baffle plate 4 extruding enter core holding unit 9, nitrogen cylinder A1 provides a certain size confined pressure to the rock core in core holding unit 9 simultaneously, drilling fluid is along the rock core crack in core holding unit 9, flow out core holding unit 9, flow into graduated cylinder 12. By regulating nitrogen cylinder A1 and nitrogen cylinder B2 output pressure size and Crack Control thin slice 8 thickness, can simulate the leakage of drilling fluid in different wellbore pressures, Different Strata pressure, different crack.

Claims

1. the utility model is a kind of simulates the experimental provision that drilling fluid is missed in formation fracture, mainly by nitrogen cylinder A (1), nitrogen cylinder B (2), Pressure gauge A (3), sealing baffle (4), fluid reservoir (5), drilling fluid import (6), Pressure gauge B (7), Crack Control thin slice (8), core holding unit (9), hold-down nut (10), flowmeter (11), graduated cylinder (12) composition, it is characterized in that: described nitrogen cylinder A (1) is connected with core holding unit (9), Pressure gauge B (7) is arranged between nitrogen cylinder A (1) and core holding unit (9), nitrogen cylinder B (2) is connected with fluid reservoir (5), there is a sealing baffle (4) fluid reservoir (5) inside, fluid reservoir (5) upper end connects drilling fluid import (6), fluid reservoir (5) is connected with core holding unit (9) left end, core holding unit (9) is made up of the two parts up and down with inner chamber, Crack Control thin slice (8) is installed in the middle of core holding unit (9), core holding unit (9) is fixing by hold-down nut (10), core holding unit (9) right-hand member connects drilling fluid outlet, drilling fluid exit is provided with flowmeter (11), graduated cylinder (12) is positioned at drilling fluid exit.

2. a kind of experimental provision that drilling fluid is missed in formation fracture of simulating according to claim 1, it is characterized in that: there is a sealing baffle (4) fluid reservoir (5) inside, sealing baffle (4) is high pressure resistant quality of rubber materials, and can be inner along fluid reservoir (5) axis relative sliding at fluid reservoir (5).

3. a kind of experimental provision that drilling fluid is missed in formation fracture of simulating according to claim 1, it is characterized in that: Crack Control thin slice (8) is installed in the middle of core holding unit (9), Crack Control thin slice (8) thickness is unfixing, changes corresponding Crack Control thin slice (8) according to simulation fracture width.