CN104076125A - Steel rock core capable of repeatedly simulating crack-type fractured formation and application method thereof - Google Patents
Steel rock core capable of repeatedly simulating crack-type fractured formation and application method thereof Download PDFInfo
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- CN104076125A CN104076125A CN201410286990.XA CN201410286990A CN104076125A CN 104076125 A CN104076125 A CN 104076125A CN 201410286990 A CN201410286990 A CN 201410286990A CN 104076125 A CN104076125 A CN 104076125A
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Abstract
The invention discloses a steel rock core capable of repeatedly simulating crack-type fractured formation. An upper rock center connecting block, a lower rock center connecting block, a left rock center crack width fixing splicing block and a right rock center crack width fixing splicing block can be spliced together to form a cylinder; one surface of the upper rock center connecting block and one surface of the lower rock center connecting block are both of wave shapes and are opposite to each other, and wavy convex and concave parts of the two opposite surfaces of the upper and lower rock center connecting blocks can be correspondingly fit together to form the interior of the cylinder; the left rock center crack width fixing splicing block and the right rock center crack width fixing splicing block are clamped at two sides of the upper and lower rock center connecting blocks, respectively, so that an interval is formed between the opposite surfaces of the upper rock center connecting block and the lower rock center connecting block. The steel rock core provided by the invention has the beneficial effects that the width size of a crack is unchanged and repeated experiments can be carried out after confining pressure is applied to the rock center.
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
Indoor while utilizing natural fracture rock core or man-made fracture rock core to carry out leak stopping slurry plugging effect evaluation, when certain confined pressure exists, the size in crack is difficult to guarantee constant, can not accurately carry out different leak stopping fluids same fracture width stratum plugging effect is evaluated to comparative analysis.Meanwhile, when applying conventional chiltern rock core and carrying out leaking stoppage experiment, rock core is subject to the pollution of leak stopping fluid, causes the repeatable variation of test core.
Summary of the invention
The object of this invention is to provide iron and steel rock core and the application on reusable simulation fracture leakage stratum, solved existing indoor utilize natural fracture rock core or man-made fracture rock core carry out the shutoff of leak stopping slurry in yielding, the vulnerable to pollution in rock core gap can not revision test problem.
Another object of the present invention is to provide the application process that iron and steel rock core carries out leak stopping slurry shutoff experiment.
The technical scheme that the iron and steel rock core on the reusable simulation fracture of the present invention leakage stratum adopts is to comprise the fixedly fixing splicing block of splicing block and rock core right side fracture width of rock core top contiguous block, rock core bottom contiguous block, rock core left side fracture width, rock core top contiguous block wherein, rock core bottom contiguous block, rock core left side fracture width is the fixing splicing block formation right cylinder that can be bolted together of splicing block and rock core right side fracture width fixedly, the one side of the one side of rock core top contiguous block and rock core bottom contiguous block is wave-like and is oppositely arranged, and what the corrugated jog on two sides can be corresponding relatively fits together, be bolted together and form in right cylinder, rock core left side fracture width fixedly splicing block and rock core right side fracture width fixedly splicing block be stuck in rock core top contiguous block and contiguous block both sides, rock core bottom, make to leave spacing between rock core top contiguous block and the opposite face of rock core bottom contiguous block.
Further, described rock core top contiguous block, rock core bottom contiguous block, rock core left side fracture width fixedly splicing block and rock core right side fracture width fixedly the length of splicing block be 70mm, these the four right cylinder diameter of sections that are spliced into are 25mm; Described rock core left side fracture width fixedly splicing block and rock core right side fracture width fixedly the width of splicing block be 16mm.
Further, between described rock core top contiguous block and the opposite face of rock core bottom contiguous block, spacing is 1-5mm.
The iron and steel rock core on the reusable simulation fracture leakage of another kind of the present invention stratum, comprises 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 xsect semicircular in shape, rock core top contiguous block and rock core bottom contiguous block are spliced to form right cylinder, the Mosaic face edge of rock core top contiguous block and rock core bottom contiguous block is provided with projection, making has distance between two Mosaic faces, and 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, between described two Mosaic faces, distance is 1-5mm.
According to the methods that two kinds of iron and steel rock cores carry out leak stopping slurry shutoff experiment above, according to following steps, carry out:
Step 1: rock core assembly is assembled after fastening before experiment, with cellophane adhesive tape, be wrapped in rock core outside and be right cylinder with fixing rock core, guarantee that each chunk can not scatter in putting the process of core holding unit into, the core holding unit of putting into the moving filtration device of High Temperature High Pressure adds certain confined pressure
Step 2: shutoff bridge liquid is injected to the circulation vessel of high pressure high temperature filter tester, inject the circulation vessel of high pressure high temperature filter tester;
Step 3: close the leak stopping bridge slurry circulation system, opening circulation replacement of instrument leak stopping bridge slurry is conventional drilling liquid, starts from the one end of the iron and steel crack rock core by shutoff liquid-circulating with the drilling fluid the configuring breakthrough that circulates;
Step 4: record to close closed loop system and let out confined pressure after the maximum breakthrough pressure of drilling fluid and the wastage of certain hour and complete once experiment.
The invention has the beneficial effects as follows and can effectively guarantee that rock core adds after confined pressure, fracture width size constancy, can carry out revision test.
Accompanying drawing explanation
Fig. 1 is that wave seam shape iron and steel core axis of the present invention is to diagrammatic cross-section;
Fig. 2 is wave seam shape iron and steel rock core radial section schematic diagram of the present invention;
Fig. 3 is that straight seam shape iron and steel core axis of the present invention is to diagrammatic cross-section;
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.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As Figure 1-Figure 4, waveform of the present invention seam shape iron and steel rock core comprises the fixedly fixing splicing block 4 of splicing block 3 and rock core right side fracture width of rock core top contiguous block 1, rock core bottom contiguous block 2, rock core left side fracture width, rock core top contiguous block 1 wherein, rock core bottom contiguous block 2, rock core left side fracture width is the fixing splicing block 4 formation right cylinder that can be bolted together of splicing block 3 and rock core right side fracture width fixedly, the one side of the one side of rock core top contiguous block 1 and rock core bottom contiguous block 2 is wave-like and is oppositely arranged, and what the corrugated jog on two sides can be corresponding relatively fits together, be bolted together and form in right cylinder, rock core left side fracture width fixedly splicing block 3 and rock core right side fracture width fixedly splicing block 4 be stuck in rock core top contiguous block 1 and contiguous block 2 both sides, rock core bottom, make to leave spacing between rock core top contiguous block 1 and the opposite face of rock core bottom contiguous block 2.
Further, described rock core top contiguous block 1, rock core bottom contiguous block 2, rock core left side fracture width fixedly splicing block 3 and rock core right side fracture width fixedly the length of splicing block 4 be 70mm, these the four right cylinder diameter of sections that are spliced into are 25mm; Described rock core left side fracture width fixedly splicing block 3 and rock core right side fracture width fixedly the width of splicing block 4 be 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.
Another kind of straight seam shape iron and steel rock core of the present invention, comprises 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 cylinders of xsect semicircular in shape, rock core top contiguous block 1 and rock core bottom contiguous block 2 are spliced to form right cylinder, the Mosaic face edge of rock core top contiguous block 1 and rock core bottom contiguous block 2 is provided with projection, making has distance between two Mosaic faces, and 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, between described two Mosaic faces, distance is 1-5mm.
Iron and steel rock core carries out the method for leak stopping slurry shutoff experiment, according to following steps, carries out:
Step 1: rock core assembly is assembled after fastening before experiment, with cellophane adhesive tape, be wrapped in rock core outside and be right cylinder with fixing rock core, guarantee that each chunk can not scatter in putting the process of core holding unit into, the core holding unit of putting into the moving filtration device of High Temperature High Pressure adds certain confined pressure
Step 2: shutoff bridge liquid is injected to the circulation vessel of high pressure high temperature filter tester, inject the circulation vessel of high pressure high temperature filter tester;
Step 3: close the leak stopping bridge slurry circulation system, opening circulation replacement of instrument leak stopping bridge slurry is conventional drilling liquid, starts from the one end of the iron and steel crack rock core by shutoff liquid-circulating with the drilling fluid the configuring breakthrough that circulates;
Step 4: record to close closed loop system and let out confined pressure after the maximum breakthrough pressure of drilling fluid and the wastage of certain hour and complete once experiment.
The present invention relates to a kind of simulation fracture situation iron and steel crack rock core, fracture width can not change because confined pressure changes, and can be repeatedly used, with the shut-off capacity on auxiliary evaluation leak stopping liquid fracture leakage stratum, be applied to the oilfield drilling field of petroleum exploration and development.The present invention relates to iron and steel rock core and application thereof that a kind of novel analog formation fracture exists situation, wide by design the seam of 1～5mm on iron and steel right cylinder, simulate the fracture width of actual formation, utilize iron and steel self intensity, can effectively guarantee in experimentation, the width dimensions in crack is constant.And before the plugging effect of different leak stopping slurries is analyzed to experiment, four assemblies of rock core are assembled after fastening by assembling sequence, with cellophane adhesive tape, be wrapped in rock core outside and be right cylinder with fixing rock core, guarantee that each chunk can not scatter in putting the process of core holding unit into.By the fixing width in self strength support crack of splicing block of rock core arranged on left and right sides steel fracture width, and do not need to worry that rock core seam is wide because added confined pressure is excessive, reduces.This rock core can carry out test of many times, and can improve plugging effect evaluation accuracy and reliability.The present invention efficiently solves while existing due to different confined pressures because of natural fracture rock core and man-made fracture rock core, crack developed width changes, cause experimental data poor repeatability or to Different Strata width fracture formation, the difficult problem that plugging effect evaluation analysis accuracy is low.Also solved the low difficult problem of different leak stopping slurry plugging effect comparative evaluation's accuracy.
The present invention will be described to enumerate specific embodiment below:
Embodiment 1:
Utilize High Temperature High Pressure to move filtration device, by iron and steel rock core, Simulation evaluation leak stopping liquid No. 1, No. 2 shut-off capacity 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, the core holding unit of putting into the moving filtration device of High Temperature High Pressure adds certain confined pressure (due to the high strength of iron and steel rock core own, therefore confined pressure controlled range is larger).
2. No. 1 shutoff bridge liquid configuring is injected to the circulation vessel of high pressure high temperature filter tester, start to carry out the circulation shutoff of certain hour with leak stopping liquid fracture rock core, the actual leakage property of simulation formation shut-off flow process.
3. close the leak stopping bridge slurry circulation system, opening circulation replacement of instrument leak stopping bridge slurry is conventional drilling liquid, starts with the drilling fluid the configuring breakthrough that circulates from the one end of the iron and steel crack rock core by shutoff liquid-circulating.
4. record the maximum breakthrough pressure P of drilling fluid
1and the wastage L of certain hour
1.
5. close closed loop system and let out confined pressure, cleaning iron and steel crack rock core.No. 2, application leak stopping liquid, repeating step 1.～4., measure after the shutoff iron and steel rock core of leak stopping liquid the maximum breakthrough pressure P of drilling fluid
2and the wastage L of certain hour
2.
The breakthrough pressure P that contrast leak stopping slurry is No. 1, No. 2
1, P
2and wastage L
1, L
2, breakthrough pressure is larger, the plugging effect of this leak stopping slurry of the less explanation of wastage is better.
Embodiment 2:
Utilize High Temperature High Pressure to move filtration device, by iron and steel rock core, Simulation evaluation frozen glue A at 150 ℃ 3mm and 5mm crack are carried out to shutoff, evaluate its shut-off capacity to different in width crack.
1. by stirring machine, prepare leak stopping frozen glue A, colloid A is poured in high temperature ageing tank.
2. after 3mm width crack iron and steel rock core being combined on request, put into ageing can slurry, utilize roller heating stove that aging filling is heated to 150 ℃;
3. slurry heating, after 5 hours, is taken out aging filling and is cooled to room temperature, now in the crack of iron and steel rock core, has been full of leak stopping colloid;
4. the core holding unit of being put into the moving filtration device of High Temperature High Pressure by the iron and steel crack rock core of colloid shutoff is completely added to certain confined pressure (because the intensity of iron and steel rock core own is high, therefore confined pressure controlled range is large), the state after lost circulation material is injected on simulation leakage property stratum.
5. completely by one end of the iron and steel crack rock core of colloid shutoff, with the breakthrough that circulate of the drilling fluid that configures, and observe leak-off situation and pressure variation.
6. when being had drilling fluid to start to miss by the outlet end of the iron and steel crack rock core of lost circulation material shutoff completely, illustrate that the lost circulation material in shutoff iron and steel rock core crack is broken, record the breakthrough pressure P of 3mm iron and steel crack rock core
1.
7. instrument cuts out, pressure release, change 5mm iron and steel rock core.Repeat 2.～6. step the breakthrough pressure P that the 5mm crack of recording leak stopping frozen glue A shutoff is
2.
8. compare P
1and P
2size, the larger explanation frozen glue of breakthrough pressure is better to the plugging effect of this fracture width.
Claims (10)
1. the iron and steel rock core on reusable simulation fracture leakage stratum, is characterized in that: comprise the fixedly fixing splicing block (4) of splicing block (3) and rock core right side fracture width of rock core top contiguous block (1), rock core bottom contiguous block (2), rock core left side fracture width, rock core top contiguous block (1) wherein, rock core bottom contiguous block (2), rock core left side fracture width is fixing splicing block (4) the formation right cylinder that can be bolted together of splicing block (3) and rock core right side fracture width fixedly, the one side of the one side of rock core top contiguous block (1) and rock core bottom contiguous block (2) is wave-like and is oppositely arranged, and what the corrugated jog on two sides can be corresponding relatively fits together, be bolted together and form in right cylinder, rock core left side fracture width fixedly splicing block (3) and rock core right side fracture width fixedly splicing block (4) be stuck in rock core top contiguous block (1) and rock core bottom contiguous block (2) both sides, make to leave spacing between rock core top contiguous block (1) and the opposite face of rock core bottom contiguous block (2).
2. according to the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 1, it is characterized in that: described rock core top contiguous block (1), rock core bottom contiguous block (2), rock core left side fracture width fixedly splicing block (3) and rock core right side fracture width fixedly the length of splicing block (4) be 70mm, these the four right cylinder diameter of sections that are spliced into are 25mm; Described rock core left side fracture width fixedly splicing block (3) and rock core right side fracture width fixedly the width of splicing block (4) be 16mm.
3. according to the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 1, it is characterized 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. the iron and steel rock core of application rights requirement 1 carries out the method for leak stopping slurry shutoff experiment, it is characterized in that carrying out according to following steps:
Step 1: rock core assembly is assembled after fastening before experiment, with cellophane adhesive tape, be wrapped in rock core outside and be right cylinder with fixing rock core, guarantee that each chunk can not scatter in putting the process of core holding unit into, the core holding unit of putting into the moving filtration device of High Temperature High Pressure adds certain confined pressure;
Step 2: shutoff bridge liquid is injected to the circulation vessel of high pressure high temperature filter tester, inject the circulation vessel of high pressure high temperature filter tester;
Step 3: close the leak stopping bridge slurry circulation system, opening circulation replacement of instrument leak stopping bridge slurry is conventional drilling liquid, starts from the one end of the iron and steel crack rock core by shutoff liquid-circulating with the drilling fluid the configuring breakthrough that circulates;
Step 4: record to close closed loop system and let out confined pressure after the maximum breakthrough pressure of drilling fluid and the wastage of certain hour and complete once experiment.
5. the iron and steel rock core on reusable simulation fracture leakage stratum, is characterized in that: comprise 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 xsect semicircular in shape, rock core top contiguous block (1) and rock core bottom contiguous block (2) are spliced to form right cylinder, the Mosaic face edge of rock core top contiguous block (1) and rock core bottom contiguous block (2) is provided with projection, making has distance between two Mosaic faces, and the Mosaic face between projection is provided with the shallow slot of grid-shaped.
6. according to the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 5, it is characterized in that: described rock core top contiguous block (1) and rock core bottom contiguous block (2) length are 70mm.
7. according to the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 5, it is characterized in that: described grid-shaped is square or prismatic.
8. according to the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 5, it is characterized in that: described cylindrical diameter of section is 25mm, the mesh width between described bossing is 20mm.
9. according to the iron and steel rock core on reusable simulation fracture leakage stratum described in claim 5, it is characterized in that: between described two Mosaic faces, distance is 1-5mm.
10. application rights requires the method that the iron and steel rock core described in 5 carries out leak stopping slurry shutoff experiment, it is characterized in that carrying out according to following steps:
Step 1: rock core assembly is assembled after fastening before experiment, with cellophane adhesive tape, be wrapped in rock core outside and be right cylinder with fixing rock core, guarantee that each chunk can not scatter in putting the process of core holding unit into, the core holding unit of putting into the moving filtration device of High Temperature High Pressure adds certain confined pressure;
Step 2: shutoff bridge liquid is injected to the circulation vessel of high pressure high temperature filter tester, inject the circulation vessel of high pressure high temperature filter tester;
Step 3: close the leak stopping bridge slurry circulation system, opening circulation replacement of instrument leak stopping bridge slurry is conventional drilling liquid, starts from the one end of the iron and steel crack rock core by shutoff liquid-circulating with the drilling fluid the configuring breakthrough that circulates;
Step 4: record to close closed loop system and let out confined pressure after the maximum breakthrough pressure of drilling fluid and the wastage of certain hour and complete once experiment.
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Cited By (6)
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| CN106526076A (en) * | 2016-11-02 | 2017-03-22 | 中国石油化工股份有限公司 | Leak stopping instrument capable of adjusting slit width |
| CN108535161A (en) * | 2018-03-10 | 2018-09-14 | 东北石油大学 | The method that progress displacement test after abundant saturated oils is carried out to matrix-high infiltration strip rock core |
| CN109374826A (en) * | 2018-09-18 | 2019-02-22 | 东北石油大学 | A kind of reusable steel rock core sheared in advance for chromium gel rubber system multistage |
| CN111561281A (en) * | 2020-05-08 | 2020-08-21 | 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 |
| CN115792189A (en) * | 2022-11-11 | 2023-03-14 | 常州大学 | Method for evaluating leakage stopping effect of drilling fluid in fracture extension type leakage reservoir |
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| CN108535161A (en) * | 2018-03-10 | 2018-09-14 | 东北石油大学 | The method that progress displacement test after abundant saturated oils is carried out to matrix-high infiltration strip rock core |
| 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 |
| CN109374826A (en) * | 2018-09-18 | 2019-02-22 | 东北石油大学 | A kind of reusable steel rock core sheared in advance for chromium gel rubber system multistage |
| CN111561281A (en) * | 2020-05-08 | 2020-08-21 | 中国海洋石油集团有限公司 | Drilling fluid leak protection leaking stoppage effect evaluation experiment 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 |
| CN115792189A (en) * | 2022-11-11 | 2023-03-14 | 常州大学 | Method for evaluating leakage stopping effect of drilling fluid in fracture extension type leakage reservoir |
| 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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