CN201902206U - Leakage stopping simulation evaluation device for well drilling in stress-sensitive formation - Google Patents

Leakage stopping simulation evaluation device for well drilling in stress-sensitive formation Download PDF

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Publication number
CN201902206U
CN201902206U CN2010206260230U CN201020626023U CN201902206U CN 201902206 U CN201902206 U CN 201902206U CN 2010206260230 U CN2010206260230 U CN 2010206260230U CN 201020626023 U CN201020626023 U CN 201020626023U CN 201902206 U CN201902206 U CN 201902206U
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CN
China
Prior art keywords
simulation
core sample
hole
confined pressure
wellbore hole
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CN2010206260230U
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Chinese (zh)
Inventor
侯冰
陈勉
金衍
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中国石油大学(北京)
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Priority to CN2010206260230U priority Critical patent/CN201902206U/en
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Publication of CN201902206U publication Critical patent/CN201902206U/en

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Abstract

The utility model discloses a leakage stopping simulation evaluation device for well drilling in stress-sensitive formation, which comprises a simulated well hole. A plurality of simulated leaking layer devices which are communicated with the simulated well hole are fixedly arranged on the lateral wall of the simulated well hole, each simulated leaking layer device consists of a sample container and a real drill core sample arranged in the sample container, one end of each sample container is communicated with a penetrating hole of the lateral wall of the simulated well hole, a through hole is disposed at the other end of each sample container, two ends of each true drill core sample respectively correspond to the corresponding penetrating hole and the corresponding through hole, and a sealed confining pressure cavity is formed between the peripheral surface of each true drill core sample and the inner wall of the corresponding sample container and communicated with a hydraulic stabilized pressure source via a pipeline. One end of the simulated well hole is a leakage stopping slurry inlet, the other end of the simulated well hole is a leakage stopping slurry outlet, the leakage stopping slurry inlet is communicated with a slurry pump, and the leakage stopping slurry outlet is communicated with the slurry pump via a pipeline, thereby forming circular flowing of leakage stopping slurry. The leakage stopping simulation evaluation device provides a theoretical basis for research on leakage stopping process of the stress-sensitive formation and evaluation of leakage stopping effects of different leakage stopping materials.

Description

Stress sensitivity strata drilling leakage blockage simulation assessment device
Technical field
The utility model is about a kind of drilling leakage blockage simulation assessment experimental system, relates in particular to a kind of stress sensitivity strata drilling leakage blockage simulation assessment device.
Background technology
The big-and-middle-sized oil gas field of the many piedmont tectonic belts of western China, because crack, hole are very grown, the existence of high steep structure in addition, show as typical stress sensitivity stratigraphical drilling feature, cause that leakage frequently takes place in the actual well drilled process, cause accidents such as bit freezing and overflow and other complex situations after the leakage again, pressure balance is extremely difficult to be adjusted, and is seriously restricting the development in oil field.
Present applied well-drilling leakage-plugging evaluation device, the steel ball that the rigidity of main employing different in width is cut shrouding and different sizes comes simulation fracture type and pore type leakage stratum, leakage-stop liquid is added on top on the leakage stratum, use the air pressure driving arrangement that leakage-stop liquid is pressed into the leakage stratum then, to estimate the performance of loss circulation material.But there is following defective in existing well-drilling leakage-plugging evaluation device:
(1) existing leak stopping evaluation device can't be realized the circulation of leak stopping slurry (liquid), can cause loss circulation material to be deposited on the simulation wellbore hole bottom, reduces the effect of leak stopping evaluation.
(2) existing leak stopping evaluation device can only be simulated the crack of even width, and is bigger with the crack gap of true form; Even some experimental facilities adopts artificial core to simulate drop ply, but also can't satisfy the parameter attribute of true core fully.
(3) existing device for plugging is not studied the influence of stress sensitivity to plugging effect by rock core is loaded confined pressure, because the actual leakage stratum in west area is all at the deep formation of several kms, therefore, the evaluation result to loss circulation material can be bigger with scene actual leak stopping situation difference.
(4) all at present leak stopping evaluation devices all are to adopt single leakage channel research experiment, and actual leakage stratum all is made up of a plurality of leakage channels, and therefore, existing structure can not be used for simultaneously a plurality of leakage channels being carried out leak stopping research and estimating.
In view of this, the inventor proposes a kind of stress sensitivity strata drilling leakage blockage simulation assessment device, to overcome the defective of prior art.
The utility model content
The purpose of this utility model is to provide a kind of stress sensitivity strata drilling leakage blockage simulation assessment device, this leakage blockage simulation assessment device utilizes the true core sample that the loss circulation material in crack property and the porosity stratum leak stopping process is estimated simulated experiment, the true core sample is being loaded under the condition of confined pressure, in the process that the leak stopping slurry is circulated the simulation drop ply is carried out effective shutoff in simulation wellbore hole, the stress of real simulation drop ply place rock and the actual leak stopping process of down-hole provide theoretical foundation with the evaluation of the plugging effect of the research of counter stress sensitiveness stratum leak-stopping technique and different loss circulation materials.
The purpose of this utility model is to realize like this, a kind of stress sensitivity strata drilling leakage blockage simulation assessment device, this leakage blockage simulation assessment device comprises a simulation wellbore hole, be fixed with a plurality of simulation drop ply devices that are communicated with simulation wellbore hole on this simulation wellbore hole sidewall, this simulation drop ply device is made of sample container and the true core sample that is arranged in the sample container, described sample container one end conducting is in the open-work of simulation wellbore hole sidewall, the sample container other end is provided with a through hole, described true core sample two ends are corresponding open-work and through hole setting respectively, constitute the confined pressure chamber of sealing between the side face of true core sample and the sample container inwall, this confined pressure chamber is communicated with the stabilizing hydraulic pressure source by pipeline; Described simulation wellbore hole one end is the leak stopping slurry inlet, and the other end is the outlet of leak stopping slurry, and this leak stopping slurry inlet is communicated with a slush pump, and this leak stopping slurry outlet is provided with an overflow valve, and this overflow valve in described slush pump, forms circulating of leak stopping slurry by pipeline connection.
In a better embodiment of the present utility model, described true core sample is a cylindrical structural; Described sample container comprises a confined pressure tube, the open-work of the corresponding simulation wellbore hole sidewall of confined pressure tube one end, and the confined pressure tube other end is provided with a confined pressure tube gland, and this confined pressure tube gland is fixedlyed connected with the simulation wellbore hole sidewall, thus, the confined pressure tube is fixed on the simulation wellbore hole sidewall; Also be fixed with a plug on this confined pressure tube gland, the described through hole corresponding with true core sample end is arranged on this plug.
In a better embodiment of the present utility model, described confined pressure tube gland is provided with flange, passes flange by a plurality of bolts and is connected in the simulation wellbore hole sidewall.
In a better embodiment of the present utility model, described true core sample is cracking rock core sample or porosity core sample; Have crack or random pore at random in the core sample.
In a better embodiment of the present utility model, the side face of described true core sample is arranged with a cylindrical shape thermal shrinkable sleeve.
In a better embodiment of the present utility model, described confined pressure tube gland inboard is provided with the first stairstepping annular groove, be provided with the second stairstepping annular groove around the open-work of described simulation wellbore hole sidewall, described true core sample one end is fastened in this first stairstepping annular groove, and the described true core sample other end is fastened in this second stairstepping annular groove; Be respectively equipped with an O-ring seals between the sidewall of the described first stairstepping annular groove and the second stairstepping annular groove and the true core sample.
In a better embodiment of the present utility model, described true core sample is of a size of φ 25 * 50mm or φ 38 * 76mm.
In a better embodiment of the present utility model, described through hole is connected with an electronic flowmeter; The inwall of described simulation wellbore hole is provided with pressure sensor.
In a better embodiment of the present utility model, described simulation wellbore hole cross section is a square, and its inner barrel dliameter is 5 inches.
Stress sensitivity strata drilling leakage blockage simulation assessment device of the present utility model, be applied to the leakage blockage simulation experiment of fractured reservoir and porosity leakage stratum, at indoor employing true core, both can simulate the circumferential pressure of rock core, can also allow the leak stopping slurry in simulation wellbore hole, realize circulating, make loss circulation material in the leak stopping slurry, evenly distribute; Also can carry out leak stopping research, change by the control circumferential pressure and estimate different loss circulation material plugging effects one or more leakage channels; The evaluation of the research of this leakage blockage simulation assessment device counter stress sensitiveness stratum leak-stopping technique and the plugging effect of different loss circulation materials provides theoretical foundation, and the leak stopping of piedmont tectonic belts research is had significance.
Description of drawings
The following drawings only is intended to the utility model done and schematically illustrates and explain, does not limit scope of the present utility model.Wherein,
Fig. 1: be the structured flowchart of the utility model stress sensitivity strata drilling leakage blockage simulation assessment device.
Fig. 2: be the structural representation of the utility model stress sensitivity strata drilling leakage blockage simulation assessment device.
Fig. 3: be the schematic top plan view of Fig. 2.
Fig. 4: be the schematic side view of Fig. 2.
Fig. 5: be the partial structurtes enlarged diagram among Fig. 2.
The specific embodiment
Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast the description of drawings specific embodiment of the present utility model.
As Fig. 1~shown in Figure 5, the utility model provides a kind of stress sensitivity strata drilling leakage blockage simulation assessment device 100, this leakage blockage simulation assessment device 100 comprises a simulation wellbore hole 1, be fixed with a plurality of simulation drop ply devices 2 that are communicated with simulation wellbore hole 1 on this simulation wellbore hole 1 sidewall, this simulation drop ply device 2 is made of sample container 21 and the true core sample 22 that is arranged in the sample container 21, described true core sample 22 is the true cores from the actual formation taking-up in situ of drilling well shaft bottom, this true core sample 22 is cracking rock core sample or porosity core sample, have crack at random in the cracking rock core sample, have random pore in the porosity core sample; This core sample 22 is cylindrical, and its physical dimension is φ 25 * 50mm or φ 38 * 76mm (two sizes all are state's dimensionings of carrying out rock core test); In the present embodiment, described a plurality of simulation drop ply device 2 is fixedly installed on the left and right sides of simulation wellbore hole 1, simulation wellbore hole one side is provided with three groups of simulation drop ply devices 2 that are simulation φ 25 * 50mm core sample, and the simulation wellbore hole opposite side is provided with three groups of simulation drop ply devices 2 that are simulation φ 38 * 76mm core sample; Sample container 21 structures of left and right sides simulation drop ply device 2 are identical, but the size difference can be used wherein one or more groups simulation drop ply device 2 according to requirement of experiment; Described sample container 21 1 end conductings are in the open-work 13 of simulation wellbore hole 1 sidewall, sample container 21 other ends are provided with a through hole 211, described true core sample 22 two ends are corresponding open-work 13 and through hole 211 settings respectively, constitute the confined pressure chamber 23 of sealing between the side face of true core sample 22 and sample container 21 inwalls, this confined pressure chamber 23 is communicated with a stabilizing hydraulic pressure source 3 by pipeline, stabilizing hydraulic pressure source 3 can be injected hydraulic oil in the confined pressure chamber 23 and apply circumferential pressure to core sample 22 outer peripheral faces, the side face of described true core sample 22 is arranged with a cylindrical shape thermal shrinkable sleeve 221, after being heated, can shrink thermal shrinkable sleeve 221, thermal shrinkable sleeve 221 tightly encases the lateral circle surface of core sample 22, two end faces of core sample 22 are not encased by thermal shrinkable sleeve, thermal shrinkable sleeve 221 can prevent that the hydraulic oil in the confined pressure chamber 23 from invading core sample 22 inside, influences the mechanical property and the plugging effect of core sample; Described simulation wellbore hole 1 one ends are leak stopping slurry inlet 11, and the other end is leak stopping slurry outlet 12; This leak stopping slurry inlet 11 is communicated with a slush pump 4, the slurry of the leak stopping in the mud pit can be injected simulation wellbore hole 1; This leak stopping slurry outlet 12 is provided with an overflow valve 5, and this overflow valve 5 exports by pipeline connection in described slush pump 4, to form circulating of leak stopping slurry; Described through hole 211 is connected with an electronic flowmeter (not shown), and with the discharge rate of monitoring leak stopping slurry, the inwall of described simulation wellbore hole 1 is provided with the pressure sensor (not shown), the bearing capacity of record loss circulation material.
(one group of simulation drop ply device 2 is example to stress sensitivity strata drilling leakage blockage simulation assessment device 100 of the present utility model to use wherein in use, as shown in Figure 2, other obsolete simulation drop ply device 2 can get final product by the open-work that shutoff plate 6 blocks corresponding simulating pit shaft sidewall), true core sample 22 is fixedly mounted in the sample container 21, at first start hydraulic pressure source of stable pressure 3, in confined pressure chamber 23, inject hydraulic oil by stabilizing hydraulic pressure source 3, sample container 21 internal pressures raise gradually, at this moment true core sample 22 circumferentially can produce constant pressure, set the discharge capacity of slush pump 4 then, and order about the leak stopping slurry and in simulation wellbore hole 1, inject gradually, leak stopping this moment slurry can flow back into the slush pump 4 from overflow valve 5 outlets, closing outflow valve 5 gradually in the experimentation, at this moment the leak stopping slurry can flow in the crack of true core sample 22 and flow out from the through hole 211 of sample container 21 gradually, rising gradually along with simulation wellbore hole 1 internal pressure, the leak stopping slurry can form shutoff to the crack of true lithology sample 22 in the simulation drop ply device 2, when through hole 211 does not have the leak stopping slurry to flow out, expression shutoff success; When pressure surpassed plugging strength, the leak stopping slurry can break through the crack of true lithology sample 22, flowed out from through hole 211 once more; When the leak stopping slurry was formed with the effect shutoff to the crack, when just through hole 211 did not have the leak stopping slurry to flow out, opening entry simulation wellbore hole 1 interior pressure changed, and starched to break through up to leak stopping and finished when the crack is flowed out by through hole 211 once more, write down the maximum bearing capacity of this moment.Bearing capacity by contrasting different loss circulation materials can the effective evaluation loss circulation material plugging effect.
From the above mentioned, stress sensitivity strata drilling leakage blockage simulation assessment device of the present utility model, be applied to the leakage blockage simulation experiment of fractured reservoir and porosity leakage stratum, both can simulate the circumferential pressure of rock core, can also allow the leak stopping slurry in simulation wellbore hole, realize circulating, make loss circulation material in the leak stopping slurry, evenly distribute; Change and estimate different loss circulation material plugging effects by the control circumferential pressure; The evaluation of the research of this leakage blockage simulation assessment device counter stress sensitiveness stratum leak-stopping technique and the plugging effect of different loss circulation materials provides theoretical foundation.
Further, in the present embodiment, as Fig. 1, shown in Figure 5, described sample container 21 comprises a confined pressure tube 212, the open-work 13 of corresponding simulation wellbore hole 1 sidewall of confined pressure tube 212 1 ends, confined pressure tube 212 other ends are provided with a confined pressure tube gland 213, and this confined pressure tube gland 213 is fixedlyed connected with the simulation wellbore hole sidewall, thus, so that confined pressure tube 212 is fixed on the simulation wellbore hole sidewall; Also be fixed with a plug 214 on this confined pressure tube gland 213, this plug 214 can be arranged in the screw on the confined pressure tube gland 213; The described through hole 211 corresponding with true core sample 22 ends is set on this plug 214.Described confined pressure tube gland 213 is provided with flange 2131, passes flange 2131 by a plurality of bolts 215 confined pressure tube gland 213 is fixedly connected on simulation wellbore hole 1 sidewall.
In the present embodiment, as shown in Figure 1, described confined pressure tube gland 213 inboards are provided with the first stairstepping annular groove 2132, be provided with the second stairstepping annular groove 131 around the open-work 13 of described simulation wellbore hole 1 sidewall, described true core sample 22 1 ends are fastened in this first stairstepping annular groove 2132, and described true core sample 22 other ends are fastened in this second stairstepping annular groove 131; As shown in Figure 5, in order to prevent that hydraulic oil from invading two end faces of core sample 22, be respectively equipped with an O-ring seals 222 between the sidewall of the described first stairstepping annular groove 2132 and the second stairstepping annular groove 131 and the true core sample 22, sealing ring 222 can guarantee that hydraulic oil only applies confined pressure to the circumferential direction of core sample.In order to prevent that hydraulic oil from leaking from confined pressure tube 212 two ends, can be provided with O-ring seals 2121 with simulation wellbore hole 1 sidewall and confined pressure tube gland 213 contact positions respectively at confined pressure tube 212 two ends.
As shown in Figure 3, Figure 4, in the present embodiment, the profile of described simulation wellbore hole 1 cross section is a square, and simulation wellbore hole 1 inner barrel dliameter is 5 inches, conforms to the size of actual pit shaft internal diameter.
Owing in the actual well drilled process, have a lot of cracks around the borehole wall, therefore, the utility model stress sensitivity strata drilling leakage blockage simulation assessment device each side is provided with three simulation drop ply devices at simulation wellbore hole, not only can simulate single drop ply (using a simulation drop ply device) and can also carry out the simulation of a plurality of drop plies (using a plurality of simulation drop ply devices) when carrying out plugging test, simulation is more near truth like this.So, this device can be estimated single seam or multiple cracking stratum, perhaps crack property and porosity stratum are carried out overall merit, when experimentation, can carry out overall merit to a plurality of cracking rock core samples, a plurality of porosity core sample or a plurality of crack property and porosity core sample simultaneously at the characteristics on dissimilar stratum.
In the present embodiment, described cracking rock core sample both can adopt intrinsic fracture rock core sample, also can shift to an earlier date and earlier the true core post is placed in the vertical press, it is applied in rock core, form at random the crack after the axial compression and carry out the leakage blockage simulation experiment again, more near near the crack state the borehole wall in the real well process.
Stress sensitivity strata drilling leakage blockage simulation assessment device of the present utility model, be applied to the leakage blockage simulation experiment of fractured reservoir and porosity leakage stratum, at indoor employing true core, both can simulate the circumferential pressure of rock core, can also allow the leak stopping slurry in simulation wellbore hole, realize circulating, make loss circulation material in the leak stopping slurry, evenly distribute; Also can carry out leak stopping research, change by the control circumferential pressure and estimate different loss circulation material plugging effects one or more leakage channels; The evaluation of the research of this leakage blockage simulation assessment device counter stress sensitiveness stratum leak-stopping technique and the plugging effect of different loss circulation materials provides theoretical foundation, and the leak stopping of piedmont tectonic belts research is had significance.
The above only is the schematic specific embodiment of the utility model, is not in order to limit scope of the present utility model.Any those skilled in the art, equivalent variations of having done under the prerequisite that does not break away from design of the present utility model and principle and modification all should belong to the scope that the utility model is protected.

Claims (9)

1. stress sensitivity strata drilling leakage blockage simulation assessment device, it is characterized in that: this leakage blockage simulation assessment device comprises a simulation wellbore hole, be fixed with a plurality of simulation drop ply devices that are communicated with simulation wellbore hole on this simulation wellbore hole sidewall, this simulation drop ply device is made of sample container and the true core sample that is arranged in the sample container, described sample container one end conducting is in the open-work of simulation wellbore hole sidewall, the sample container other end is provided with a through hole, described true core sample two ends are corresponding open-work and through hole setting respectively, constitute the confined pressure chamber of sealing between the side face of true core sample and the sample container inwall, this confined pressure chamber is communicated with the stabilizing hydraulic pressure source by pipeline; Described simulation wellbore hole one end is the leak stopping slurry inlet, and the other end is the outlet of leak stopping slurry, and this leak stopping slurry inlet is communicated with a slush pump, and this leak stopping slurry outlet is provided with an overflow valve, and this overflow valve in described slush pump, forms circulating of leak stopping slurry by pipeline connection.
2. stress sensitivity strata drilling leakage blockage simulation assessment device as claimed in claim 1 is characterized in that: described true core sample is a cylindrical structural; Described sample container comprises a confined pressure tube, the open-work of the corresponding simulation wellbore hole sidewall of confined pressure tube one end, and the confined pressure tube other end is provided with a confined pressure tube gland, and this confined pressure tube gland is fixedlyed connected with the simulation wellbore hole sidewall, thus, the confined pressure tube is fixed on the simulation wellbore hole sidewall; Also be fixed with a plug on this confined pressure tube gland, the described through hole corresponding with true core sample end is arranged on this plug.
3. stress sensitivity strata drilling leakage blockage simulation assessment device as claimed in claim 2 is characterized in that: described confined pressure tube gland is provided with flange, passes flange by a plurality of bolts and is connected in the simulation wellbore hole sidewall.
4. stress sensitivity strata drilling leakage blockage simulation assessment device as claimed in claim 2 is characterized in that: described true core sample is cracking rock core sample or porosity core sample; Have crack or random pore at random in the core sample.
5. stress sensitivity strata drilling leakage blockage simulation assessment device as claimed in claim 2 is characterized in that: the side face of described true core sample is arranged with a cylindrical shape thermal shrinkable sleeve.
6. stress sensitivity strata drilling leakage blockage simulation assessment device as claimed in claim 2, it is characterized in that: described confined pressure tube gland inboard is provided with the first stairstepping annular groove, be provided with the second stairstepping annular groove around the open-work of described simulation wellbore hole sidewall, described true core sample one end is fastened in this first stairstepping annular groove, and the described true core sample other end is fastened in this second stairstepping annular groove; Be respectively equipped with an O-ring seals between the sidewall of the described first stairstepping annular groove and the second stairstepping annular groove and the true core sample.
7. stress sensitivity strata drilling leakage blockage simulation assessment device as claimed in claim 2 is characterized in that: described true core sample is of a size of φ 25 * 50mm or φ 38 * 76mm.
8. stress sensitivity strata drilling leakage blockage simulation assessment device as claimed in claim 1, it is characterized in that: described through hole is connected with an electronic flowmeter; The inwall of described simulation wellbore hole is provided with pressure sensor.
9. stress sensitivity strata drilling leakage blockage simulation assessment device as claimed in claim 1 is characterized in that: described simulation wellbore hole cross section is square, and its inner barrel dliameter is 5 inches.
CN2010206260230U 2010-11-24 2010-11-24 Leakage stopping simulation evaluation device for well drilling in stress-sensitive formation CN201902206U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102011581A (en) * 2010-11-24 2011-04-13 中国石油大学(北京) Simulated evaluation device for well-drilling plugging of stress sensitivity stratum
CN102305045A (en) * 2011-08-05 2012-01-04 中联煤层气国家工程研究中心有限责任公司 Shaft crack simulator
CN102900431A (en) * 2012-09-06 2013-01-30 中国石油化工股份有限公司 Plugging simulation experiment device for horizontal well
CN103926267A (en) * 2014-04-28 2014-07-16 西安石油大学 Method for quantitatively evaluating pore throat change degree in stress sensitive process
CN106383221A (en) * 2016-11-02 2017-02-08 中国石油大学(北京) Stratum stress sensitive experiment testing method and device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102011581A (en) * 2010-11-24 2011-04-13 中国石油大学(北京) Simulated evaluation device for well-drilling plugging of stress sensitivity stratum
CN102011581B (en) * 2010-11-24 2013-02-06 中国石油大学(北京) Simulated evaluation device for well-drilling plugging of stress sensitivity stratum
CN102305045A (en) * 2011-08-05 2012-01-04 中联煤层气国家工程研究中心有限责任公司 Shaft crack simulator
CN102900431A (en) * 2012-09-06 2013-01-30 中国石油化工股份有限公司 Plugging simulation experiment device for horizontal well
CN102900431B (en) * 2012-09-06 2015-11-25 中国石油化工股份有限公司 Horizontal well shutoff analogue experiment installation
CN103926267A (en) * 2014-04-28 2014-07-16 西安石油大学 Method for quantitatively evaluating pore throat change degree in stress sensitive process
CN103926267B (en) * 2014-04-28 2016-05-04 西安石油大学 A kind of method of pore throat intensity of variation in quantitative assessment stress sensitive process
CN106383221A (en) * 2016-11-02 2017-02-08 中国石油大学(北京) Stratum stress sensitive experiment testing method and device

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