CN104076125B - The iron and steel rock core on reusable simulation fracture leakage stratum and application process - Google Patents
The iron and steel rock core on reusable simulation fracture leakage stratum and application process Download PDFInfo
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- CN104076125B CN104076125B CN201410286990.XA CN201410286990A CN104076125B CN 104076125 B CN104076125 B CN 104076125B CN 201410286990 A CN201410286990 A CN 201410286990A CN 104076125 B CN104076125 B CN 104076125B
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Abstract
The invention discloses the iron and steel rock core on reusable simulation fracture leakage stratum, wherein rock core top contiguous block, rock core bottom contiguous block, on the left of rock core, on the right side of the fixing splicing block of fracture width and rock core, the fixing splicing block of fracture width can be bolted together composition cylinder, the one side of rock core top contiguous block and the one side of rock core bottom contiguous block are wave-like and are oppositely arranged, and the corrugated jog of opposing sides can be corresponding fit together, in the composition that is bolted together cylinder, on the left of rock core, fracture width is fixed the fixing splicing block of fracture width on the right side of splicing block and rock core and is stuck in rock core top contiguous block and contiguous block both sides, rock core bottom, make to leave spacing between the opposite face of rock core top contiguous block and rock core bottom contiguous block.After the invention has the beneficial effects as follows that can be effectively ensured rock core adds confined pressure, fracture width size constancy, can be repeated test.
Description
Technical field
The invention belongs to formation fracture blocking technology field, relate to iron and steel rock core and the application process on reusable simulation fracture leakage stratum.
Background technology
When utilizing intrinsic fracture rock core or man-made fracture rock core to carry out leak stopping slurry plugging effect evaluation in indoor, when certain confined pressure exists, the size in crack is it is difficult to ensure that constant, it is impossible to accurately carry out different plugging fluid and same fracture width stratum plugging effect is evaluated relative analysis.Meanwhile, when the conventional chiltern rock core of application carries out leaking stoppage experiment, rock core is subject to the pollution of plugging fluid, causes the repeatable variation of test core.
Summary of the invention
It is an object of the invention to provide the reusable simulation fracture leakage iron and steel rock core on stratum and application, solve existing utilize intrinsic fracture rock core or man-made fracture rock core to carry out in indoor rock core gap in leak stopping slurry closure is yielding, vulnerable to pollution can not the problem of repeated trials.
It is a further object to provide iron and steel rock core and carry out the application process of leak stopping slurry closure experiment.
The iron and steel rock core on the present invention reusable simulation fracture leakage stratum be employed technical scheme comprise that to include the fixing splicing block of fracture width on the right side of the fixing splicing block of fracture width on the left of rock core top contiguous block, rock core bottom contiguous block, rock core and rock core；Wherein rock core top contiguous block, rock core bottom contiguous block, on the left of rock core, on the right side of the fixing splicing block of fracture width and rock core, the fixing splicing block of fracture width can be bolted together composition cylinder, the one side of rock core top contiguous block and the one side of rock core bottom contiguous block are wave-like and are oppositely arranged, and the corrugated jog of opposing sides can be corresponding fit together, in the composition that is bolted together cylinder, on the left of rock core, fracture width is fixed the fixing splicing block of fracture width on the right side of splicing block and rock core and is stuck in rock core top contiguous block and contiguous block both sides, rock core bottom, make to leave spacing between the opposite face of rock core top contiguous block and rock core bottom contiguous block.
Further, on the left of described rock core top contiguous block, rock core bottom contiguous block, rock core, on the right side of the fixing splicing block of fracture width and rock core, the length of the fixing splicing block of fracture width is 70mm, and these the four pieces cylinder section diameters being spliced into are 25mm；On the left of described rock core, fracture width fixes the width of the fixing splicing block of fracture width on the right side of splicing block and rock core is 16mm.
Further, between the opposite face of described rock core top contiguous block and rock core bottom contiguous block, spacing is 1-5mm.
The iron and steel rock core on the another kind reusable simulation fracture leakage stratum of the present invention, including rock core top contiguous block and rock core bottom contiguous block；Wherein rock core top contiguous block and rock core bottom contiguous block are the cylinders of cross section semicircular in shape, rock core top contiguous block and rock core bottom contiguous block are spliced to form cylinder, the Mosaic face edge of rock core top contiguous block and rock core bottom contiguous block is provided with projection, making there is distance between two Mosaic faces, the Mosaic face between projection is provided with the shallow slot of grid-shaped.
Further, described rock core top contiguous block and rock core bottom contiguous block length are 70mm.
Further, described grid-shaped is square or prismatic.
Further, described cylindrical diameter of section is 25mm, and the mesh width between described bossing is 20mm.
Further, the spacing of said two Mosaic face is 1-5mm.
According to the method that both above iron and steel rock core carries out leak stopping slurry closure experiment, carry out according to following steps:
Step 1: after rock core assembly is carried out before experiment assembling fastening, being wrapped in outside rock core with cellophane adhesive tape with fixing rock core is cylinder, ensure that each chunk will not scatter in the process put into core holding unit, put in the core holding unit of the dynamic filtration device of High Temperature High Pressure and add certain confined pressure
Step 2: closure bridge liquid is injected in the circulation vessel of high pressure high temperature filter tester, inject in the circulation vessel of high pressure high temperature filter tester；
Step 3: close leak stopping bridge slurry blood circulation, opening circulation instrument replacement leak stopping bridge slurry is conventional drilling liquid, is circulated breakthrough from the drilling fluid started with having configured by one end of the iron and steel crack rock core after closure liquid circulation；
Step 4: close closed loop system after the record maximum breakthrough pressure of drilling fluid and the wastage of certain time and let out confined pressure and complete once to test.
After the invention has the beneficial effects as follows that can be effectively ensured rock core adds confined pressure, fracture width size constancy, can be repeated test.
Accompanying drawing explanation
Fig. 1 is wave of the present invention seam shape iron and steel rock core axial cross-sectional views；
Fig. 2 is wave of the present invention seam shape iron and steel rock core radial section schematic diagram；
Fig. 3 is straight seam shape iron and steel rock core axial cross-sectional views of the present invention；
Fig. 4 is straight seam shape iron and steel rock core radial section schematic diagram of the present invention；
Fig. 5 is the shallow slot schematic diagram of straight seam shape iron and steel rock core Mosaic face grid-shaped of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As Figure 1-Figure 4, the waveform seam shape iron and steel rock core of the present invention includes the fixing splicing block 4 of fracture width on the right side of the fixing splicing block 3 of fracture width on the left of rock core top contiguous block 1, rock core bottom contiguous block 2, rock core and rock core；Wherein rock core top contiguous block 1, rock core bottom contiguous block 2, on the left of rock core, on the right side of the fixing splicing block 3 of fracture width and rock core, the fixing splicing block 4 of fracture width can be bolted together composition cylinder, the one side of rock core top contiguous block 1 and the one side of rock core bottom contiguous block 2 are wave-like and are oppositely arranged, and the corrugated jog of opposing sides can be corresponding fit together, in the composition that is bolted together cylinder, on the left of rock core, fracture width is fixed the fixing splicing block 4 of fracture width on the right side of splicing block 3 and rock core and is stuck in rock core top contiguous block 1 and contiguous block 2 both sides, rock core bottom, make to leave spacing between the opposite face of rock core top contiguous block 1 and rock core bottom contiguous block 2.
Further, on the left of described rock core top contiguous block 1, rock core bottom contiguous block 2, rock core, on the right side of the fixing splicing block 3 of fracture width and rock core, the length of the fixing splicing block 4 of fracture width is 70mm, and these the four pieces cylinder section diameters being spliced into are 25mm；On the left of described rock core, fracture width fixes the width of the fixing splicing block 4 of fracture width on the right side of splicing block 3 and rock core is 16mm.
Further, between described rock core top contiguous block 1 and the opposite face of rock core bottom contiguous block 2, spacing is 1-5mm.
The another kind of straight seam shape iron and steel rock core of the present invention, including rock core top contiguous block 1 and rock core bottom contiguous block 2；Wherein rock core top contiguous block 1 and rock core bottom contiguous block 2 are the cylinders of cross section semicircular in shape, rock core top contiguous block 1 and rock core bottom contiguous block 2 are spliced to form cylinder, the Mosaic face edge of rock core top contiguous block 1 and rock core bottom contiguous block 2 is provided with projection, making there is distance between two Mosaic faces, the Mosaic face between projection is provided with the shallow slot of grid-shaped.
Further, described rock core top contiguous block 1 and rock core bottom contiguous block 2 length are 70mm.
Further, described grid-shaped is square or prismatic.
Further, described cylindrical diameter of section is 25mm, and the mesh width between described bossing is 20mm.
Further, the spacing of said two Mosaic face is 1-5mm.
Iron and steel rock core carries out the method for leak stopping slurry closure experiment, carries out according to following steps:
Step 1: after rock core assembly is carried out before experiment assembling fastening, being wrapped in outside rock core with cellophane adhesive tape with fixing rock core is cylinder, ensure that each chunk will not scatter in the process put into core holding unit, put in the core holding unit of the dynamic filtration device of High Temperature High Pressure and add certain confined pressure
Step 2: closure bridge liquid is injected in the circulation vessel of high pressure high temperature filter tester, inject in the circulation vessel of high pressure high temperature filter tester；
Step 3: close leak stopping bridge slurry blood circulation, opening circulation instrument replacement leak stopping bridge slurry is conventional drilling liquid, is circulated breakthrough from the drilling fluid started with having configured by one end of the iron and steel crack rock core after closure liquid circulation；
Step 4: close closed loop system after the record maximum breakthrough pressure of drilling fluid and the wastage of certain time and let out confined pressure and complete once to test.
The present invention relates to a kind of simulation fracture situation iron and steel crack rock core, fracture width will not change because of confined pressure change, and can repeatedly use, miss the shut-off capacity on stratum with auxiliary evaluation leak stopping liquid fracture, be applied to the oilfield drilling field of petroleum exploration and development.The present invention relates to a kind of novel analog formation fracture and there is iron and steel rock core and the application thereof of situation, by designing the seam width of 1～5mm on iron and steel cylinder, simulate the fracture width of actual formation, utilize iron and steel self-strength, can being effectively ensured in experimentation, the width dimensions in crack is constant.And after being undertaken assembling by assembling sequence by four assemblies of rock core before the plugging effect of different leak stopping slurries is analyzed experiment and fastening, being wrapped in outside rock core with cellophane adhesive tape with fixing rock core is cylinder, it is ensured that each chunk will not scatter in the process put into core holding unit.By the width of the self-strength supporting crack of the fixing splicing block of rock core arranged on left and right sides steel fracture width, without worrying that rock core seam width reduces because added confined pressure is excessive.This rock core can carry out test of many times, and can improve plugging effect evaluation accuracy and reliability.The present invention efficiently solve because of intrinsic fracture rock core and man-made fracture rock core due to different confined pressures exist time, crack developed width changes, and causes experimental data poor repeatability or to Different Strata width fracture formation, the difficult problem that plugging effect evaluation analysis accuracy is low.Also the difficult problem that different leak stopping slurry plugging effect comparative evaluation's accuracy is low is solved.
Specific embodiment is set forth below, and the present invention will be described:
Embodiment 1:
Utilize High Temperature High Pressure to move filtration device, by iron and steel rock core, Simulation evaluation leak stopping liquid 1, No. 2 shut-off capacitys to 3mm fracture width iron and steel rock core, and carry out comparative evaluation.
1., after four assemblies of 3mm width iron and steel crack rock core being combined on request, put into and the core holding unit of the dynamic filtration device of High Temperature High Pressure adds certain confined pressure (due to the high intensity of of iron and steel rock core itself, therefore confined pressure controlled range is bigger).
2. No. 1 closure bridge liquid configured is injected in the circulation vessel of high pressure high temperature filter tester, start to carry out with leak stopping liquid fracture rock core the circulation closure of certain time, simulation reality leakage property formation shut-off flow process.
3. closing leak stopping bridge slurry blood circulation, opening circulation instrument replacement leak stopping bridge slurry is conventional drilling liquid, is circulated breakthrough from the drilling fluid started with having configured by one end of the iron and steel crack rock core after closure liquid circulation.
4. the maximum breakthrough pressure P of drilling fluid is recorded1And the wastage L of certain time1。
5. close closed loop system and let out confined pressure, cleaning iron and steel crack rock core.Application leak stopping liquid 2, repeat step 1.～4., measure leak stopping liquid closure iron and steel rock core after, the maximum breakthrough pressure P of drilling fluid2And the wastage L of certain time2。
Contrast leak stopping slurry 1, the breakthrough pressure P of No. 21、P2And wastage L1、L2, breakthrough pressure is more big, the plugging effect of wastage this leak stopping slurry of more little explanation is more good.
Embodiment 2:
Utilizing High Temperature High Pressure to move filtration device, by iron and steel rock core, 3mm and 5mm crack is blocked by the frozen glue A at Simulation evaluation 150 DEG C, evaluates its shut-off capacity to different in width crack.
1. by blender preparation leak stopping frozen glue A, colloid A is poured in high temperature ageing tank.
2. put in ageing can slurry after 3mm width crack iron and steel rock core being combined on request, utilize roller heating stove that aging filling is heated to 150 DEG C；
3. room temperature is after 5 hours, takes out aging filling and is cooled to room temperature, is now filled with leak stopping colloid in the crack of iron and steel rock core；
4. the iron and steel crack rock core blocked by colloid completely is put into and the core holding unit of the dynamic filtration device of High Temperature High Pressure adds certain confined pressure (owing to the intensity of iron and steel rock core own is high, therefore confined pressure controlled range is big), the state after loss circulation material is injected on simulation leakage property stratum.
5. in the one end of the iron and steel crack rock core blocked by colloid completely, it is circulated breakthrough with the drilling fluid configured, and observes leak-off situation and pressure change.
6. when the liquid outlet of the iron and steel crack rock core blocked by loss circulation material completely has drilling fluid to start to miss, illustrate that the loss circulation material in closure iron and steel rock core crack is broken, the breakthrough pressure P of record 3mm iron and steel crack rock core1。
7. by instrument closedown, pressure release, 5mm iron and steel rock core is changed.Repeat 2.～6. step, record the breakthrough pressure P that the 5mm crack of leak stopping frozen glue A closure is2。
8. P is compared1And P2Size, the more big explanation frozen glue of breakthrough pressure is more good to the plugging effect of this fracture width.
Claims (10)
1. the iron and steel rock core on reusable simulation fracture leakage stratum, it is characterised in that: include the fixing splicing block (4) of fracture width on the right side of the fixing splicing block (3) of fracture width on the left of rock core top contiguous block (1), rock core bottom contiguous block (2), rock core and rock core；Wherein rock core top contiguous block (1), rock core bottom contiguous block (2), on the right side of the fixing splicing block (3) of fracture width and rock core, fracture width is fixed splicing block (4) and can be bolted together composition cylinder on the left of rock core；The one side on rock core top contiguous block (1) and the one side of rock core bottom contiguous block (2) are wave-like and are oppositely arranged, and the corrugated jog of opposing sides can be corresponding fit together, two faces being provided with jog are arranged in cylinder；On the left of rock core, fracture width is fixed the fixing splicing block (4) of fracture width on the right side of splicing block (3) and rock core and is stuck in rock core top contiguous block (1) and contiguous block (2) both sides, rock core bottom, makes to leave spacing between the opposite face of rock core top contiguous block (1) and rock core bottom contiguous block (2).
2. the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 1, it is characterized in that: on the left of described rock core top contiguous block (1), rock core bottom contiguous block (2), rock core, on the right side of the fixing splicing block (3) of fracture width and rock core, fracture width is fixed the length of splicing block (4) and is 70mm, and these the four pieces cylinder section diameters being spliced into are 25mm；On the left of described rock core, on the right side of the fixing splicing block (3) of fracture width and rock core, fracture width is fixed the width of splicing block (4) and is 16mm.
3. the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 1, it is characterised in that: between described rock core top contiguous block (1) and the opposite face of rock core bottom contiguous block (2), spacing is 1-5mm.
4. apply the method that the iron and steel rock core of claim 1 carries out leak stopping slurry closure experiment, it is characterised in that carry out according to following steps:
Step 1: after rock core assembly is carried out before experiment assembling fastening, being wrapped in outside rock core with cellophane adhesive tape with fixing rock core is cylinder, ensure that each chunk will not scatter in the process put into core holding unit, put in the core holding unit of the dynamic filtration device of High Temperature High Pressure, add certain confined pressure；
Step 2: closure bridge liquid is injected in the circulation vessel of the dynamic filtration device of High Temperature High Pressure；
Step 3: close leak stopping bridge slurry blood circulation, opening circulation instrument replacement leak stopping bridge slurry is conventional drilling liquid, is circulated breakthrough from the drilling fluid started with having configured by one end of the iron and steel crack rock core after closure liquid circulation；
Step 4: close closed loop system after the record maximum breakthrough pressure of drilling fluid and the wastage of certain time and let out confined pressure and complete once to test.
5. the iron and steel rock core on reusable simulation fracture leakage stratum, it is characterised in that: include rock core top contiguous block (1) and rock core bottom contiguous block (2)；Wherein rock core top contiguous block (1) and rock core bottom contiguous block (2) are that the cylinder of cross section semicircular in shape, rock core top contiguous block (1) and rock core bottom contiguous block (2) are spliced to form cylinder；The Mosaic face edge of rock core top contiguous block (1) and rock core bottom contiguous block (2) is provided with projection, makes there is distance between two Mosaic faces, and the Mosaic face between projection is provided with the shallow slot of grid-shaped.
6. the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 5, it is characterised in that: the length of described rock core top contiguous block (1) and rock core bottom contiguous block (2) is 70mm.
7. the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 5, it is characterised in that: described grid-shaped is square or prismatic.
8. the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 5, it is characterised in that: described cylindrical diameter of section is 25mm, and the mesh width between described bossing is 20mm.
9. the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 5, it is characterised in that: the distance between said two Mosaic face is 1-5mm.
10. the method that application iron and steel rock core described in claim 5 carries out leak stopping slurry closure experiment, it is characterised in that carry out according to following steps:
Step 1: after rock core assembly is carried out before experiment assembling fastening, being wrapped in outside rock core with cellophane adhesive tape with fixing rock core is cylinder, ensure that each chunk will not scatter in the process put into core holding unit, put in the core holding unit of the dynamic filtration device of High Temperature High Pressure, add certain confined pressure；
Step 2: closure bridge liquid is injected in the circulation vessel of the dynamic filtration device of High Temperature High Pressure；
Step 3: close leak stopping bridge slurry blood circulation, opening circulation instrument replacement leak stopping bridge slurry is conventional drilling liquid, is circulated breakthrough from the drilling fluid started with having configured by one end of the iron and steel crack rock core after closure liquid circulation；
Step 4: close closed loop system after the record maximum breakthrough pressure of drilling fluid and the wastage of certain time and let out confined pressure and complete once to test.
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| CN106526076B (en) * | 2016-11-02 | 2019-02-19 | 中国石油化工股份有限公司 | A kind of adjustable slit width leak stopping instrument |
| CN108535161B (en) * | 2018-03-10 | 2020-09-22 | 东北石油大学 | Method for carrying out displacement experiment after fully saturated oil is carried out on matrix-high permeability strip rock core |
| CN109374826B (en) * | 2018-09-18 | 2020-12-22 | 东北石油大学 | Reusable steel core for multistage pre-shearing of chromium gel system |
| CN111561281B (en) * | 2020-05-08 | 2022-04-29 | 中国海洋石油集团有限公司 | Drilling fluid leak protection leaking stoppage effect evaluation experiment system |
| CN114414739A (en) * | 2022-01-21 | 2022-04-29 | 西南石油大学 | Evaluation method for plugging effect of combined width crack |
| CN115792189B (en) * | 2022-11-11 | 2024-05-14 | 常州大学 | Method for evaluating plugging effect of fracture expansion type leakage reservoir drilling fluid |
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