CN109403936A - For carrying out the process and device that sealing envelope is altered to high temperature and pressure absorption well - Google Patents
For carrying out the process and device that sealing envelope is altered to high temperature and pressure absorption well Download PDFInfo
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- CN109403936A CN109403936A CN201811357523.6A CN201811357523A CN109403936A CN 109403936 A CN109403936 A CN 109403936A CN 201811357523 A CN201811357523 A CN 201811357523A CN 109403936 A CN109403936 A CN 109403936A
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- Prior art keywords
- high temperature
- absorption well
- pressure absorption
- pressure
- oil pipe
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The present invention provides a kind of for carrying out the process and device that sealing envelope is altered to high temperature and pressure absorption well, this method comprises: inserting quartz sand into high temperature and pressure absorption well, the upper bound of quartz sand, which is formed, newly makes shaft bottom；The first coolant liquid is injected into high temperature and pressure absorption well；Surface line is connected, pressure testing is carried out to oil pipe and casing by surface line；When the temperature for newly making shaft bottom is down to the first preset temperature, and oil pipe and casing pressure test keep not piercing leakage to scheduled pressure value, the pre- blocking agent of high temperature is injected into high temperature and pressure absorption well by oil pipe；The second coolant liquid is injected in high temperature and pressure absorption well to stating；When the temperature for newly making shaft bottom is down to the second preset temperature, and when high temperature pre- blocking agent initial set, high temperature sealing agent is injected into high temperature and pressure absorption well.The process and device for altering to high temperature and pressure absorption well progress sealing envelope of the embodiment of the present invention can satisfy high temperature and pressure absorption well and seal the process requirements altered to sealing.
Description
Technical field
The present invention relates to absorption well disposing technique technical fields, more particularly to one kind is for carrying out high temperature and pressure absorption well
The process and device that sealing envelope is altered.
Background technique
The description of this part, which is only provided, discloses relevant background information to the present invention, without constituting the prior art.
Using steam soak and steam flooding technology heavy crude producing middle and later periods, due to more rounds steam soak and it is long when
Between steam drive, stratum steam be likely to form fingering and ground interlayer has channeling.In addition, the casing of oil well due to running for a long time
It may damage and miss afterwards.Alternatively, the outer cementing concrete ring of casing fail to be formed and manages because prolonged high temperature and pressure corrodes
It alters outside.Above-mentioned is the situation for the high temperature and pressure leakage that thickened oil recovery is likely to occur in the process.In this way, the high temperature being subsequently implanted into is high
Pressure steam may carry natural gas and H in oil well2S gas loses leak source and scurries out ground by altering channel and/or casing outside pipe
Face generates explosion or makes one to be poisoned.If foring ground large area gas leakage, would have to shut down some producing wells, even
It is possible that shutting down Partial Block, this causes thickened oil recovery production and seriously affects, and also causes to personal safety and environmental pollution
It seriously endangers.Therefore, it is necessary to implement sealing envelope to these high temperature and pressure absorption wells to alter measure.
However, the temperature in above-mentioned leakage well shaft is generally all higher, and well head is often accompanied by oil jacket pressure.Conventional sealing
Envelope alters technique and is usually applicable only to that well temperature is lower, and oil reservoir is not missed, and the well that the oil jacket pressure of well head is zero.Therefore, conventional
Sealing envelope alter technique and be unable to satisfy high temperature and pressure absorption well the process requirements altered are sealed to sealing.
It should be noted that the above description of the technical background be intended merely to it is convenient to technical solution of the present invention carry out it is clear,
Complete explanation, and facilitate the understanding of those skilled in the art and illustrate.Cannot merely because these schemes of the invention
Background technology part is expounded and thinks that above-mentioned technical proposal is known to those skilled in the art.
Summary of the invention
Based on prior art defect above-mentioned, the embodiment of the present invention provides a kind of for sealing to high temperature and pressure absorption well
The process and device that layer envelope is altered, can satisfy high temperature and pressure absorption well and seal the process requirements altered to sealing.
To achieve the goals above, the present invention provides the following technical solutions.
It is a kind of to seal the process altered for carrying out sealing to high temperature and pressure absorption well, comprising:
Quartz sand is inserted into the high temperature and pressure absorption well by oil pipe, the quartz sand fills and occupies the oil pipe
Positioned at the artificial bottom of a well of the high temperature and pressure absorption well to the first volume space between the leakage oil reservoir upper bound, the part quartz
Sand is squeezed into the leakage oil reservoir；At this point, the upper bound of the quartz sand, which is formed, newly makes shaft bottom；
The first coolant liquid is injected into the high temperature and pressure absorption well by the oil pipe；
Surface line is connected, pressure testing is carried out to the oil pipe and casing by the surface line；
When the temperature for newly making shaft bottom is down to the first preset temperature, and the oil pipe and described sleeve pipe pressure testing are to pre- level pressure
Force value and when keeping not piercing leakage, the pre- blocking agent of high temperature, the high temperature are injected into the high temperature and pressure absorption well by the oil pipe
Pre- blocking agent is squeezed into the leakage oil reservoir；
The second coolant liquid is injected into the high temperature and pressure absorption well by the oil pipe；
It newly makes the temperature in shaft bottom when described and is down to the second preset temperature, and when the high temperature pre- blocking agent initial set, pass through institute
It states oil pipe and injects high temperature sealing agent into the high temperature and pressure absorption well, the high temperature sealing agent is squeezed into the leakage oil reservoir.
Preferably, in the step of inserting quartz sand into the high temperature and pressure absorption well by oil pipe, the quartz sand
Filling amount obtained according to following formula:
W=V*1.6*1000；
Wherein, W is the individual well dosage of the quartz sand, kg；V is the volume of first volume space, m3。
Preferably, the first coolant liquid or the second coolant liquid are being injected into the high temperature and pressure absorption well by the oil pipe
The step of in, the dosage V of first coolant liquid or second coolant liquidIt is cold=V1+V2, V1To enter in the leakage oil reservoir
The first coolant liquid or the second coolant liquid volume, V2It is located at the well head of the high temperature and pressure absorption well to described for the oil pipe
Miss the volume of the second volume space between the upper bound of oil reservoir；
When it is described newly make the temperature in shaft bottom in first threshold range when, V1=π r2ΦH；
When it is described newly make the temperature in shaft bottom within the scope of second threshold when, V1=1.5 π r2ΦH；
Wherein, the minimum value of the second threshold range is greater than or equal to the maximum value of the first threshold range, and r is institute
State the radius of leakage oil reservoir, m；Φ is the porosity of the leakage oil reservoir, %；H is the effective thickness of the leakage oil reservoir, m.
Preferably, it in the step of injecting the pre- blocking agent of high temperature into the high temperature and pressure absorption well by the oil pipe, adopts
The pre- blocking agent of the high temperature is replaced with the first displacement fluid, the dosage of first displacement fluid is less than the first outage, institute
State the first outage be the oil pipe be located at the well head of the high temperature and pressure absorption well to the pre- blocking agent of the high temperature first in advance
Stay the spatial volume between depth.
Preferably, in the step of injecting the pre- blocking agent of high temperature into the high temperature and pressure absorption well by the oil pipe, institute
The dosage for stating the pre- blocking agent of high temperature is equal to described sleeve pipe and is located at the lower bound to the upper bound of the leakage oil reservoir of the leakage oil reservoir or more
Volume between preset distance.
Preferably, it in the step of injecting the pre- blocking agent of high temperature into the high temperature and pressure absorption well by the oil pipe, adopts
The first pre- blocking agent and the second pre- blocking agent are used as the mode of the first slug and the second slug to be sealed in advance to the leakage oil reservoir
It is stifled.
Preferably, the described first pre- blocking agent is phenolic resin, and the second pre- blocking agent is G grades of superfine cements.
Preferably, it in the step of injecting high temperature sealing agent into the high temperature and pressure absorption well by the oil pipe, adopts
The high temperature sealing agent is replaced with the second displacement fluid, the dosage of second displacement fluid is less than the second outage, institute
State the second outage be the oil pipe be located at the well head of the high temperature and pressure absorption well to the high temperature sealing agent second in advance
Stay the spatial volume between depth.
Preferably, in the step of injecting high temperature sealing agent into the high temperature and pressure absorption well by the oil pipe, institute
The dosage for stating high temperature sealing agent is obtained according to following formula:
VIt is stifled=π r2ΦH；
Wherein, r is the radius of the leakage oil reservoir, m；Φ is the porosity of the leakage oil reservoir, %；H is the leakage
The effective thickness of oil reservoir, m.
Preferably, it after the first scheduled duration of the high temperature sealing agent Hou Ning, is suppressed in Xiang Suoshu oil pipe, it is pre- by second
Timing is long, detects the pressure drop in the oil pipe, judges whether sealing envelope alters technique qualified according to the pressure drop.
Preferably, when the pressure drop is less than or equal to preset threshold, judge that sealing seals and alter technique qualification, described in completion
The sealing envelope of high temperature and pressure absorption well alters technological operation.
Preferably, when the pressure drop is greater than preset threshold, it is unqualified to judge that sealing envelope alters technique；At this point, repeating to hold
The step of row injects high temperature sealing agent by the oil pipe into the high temperature and pressure absorption well, until the pressure drop is less than or waits
Until the preset threshold.
It is a kind of to seal the process unit altered for carrying out sealing to high temperature and pressure absorption well, comprising:
Quartz sand inserts module, for inserting quartz sand, the quartz into the high temperature and pressure absorption well by oil pipe
Sand fills and occupies the oil pipe is located between the artificial bottom of a well extremely leakage oil reservoir upper bound of the high temperature and pressure absorption well first
Volume space, the part quartz sand are squeezed into the leakage oil reservoir；At this point, the upper bound of the quartz sand, which is formed, newly makes shaft bottom；
First coolant liquid injection module, it is cooling for injecting first into the high temperature and pressure absorption well by the oil pipe
Liquid；
Pressure testing module carries out pressure testing to the oil pipe and casing by the surface line for connecting surface line；
The pre- blocking agent injection module of high temperature, for being down to the first preset temperature, and the oil when the temperature for newly making shaft bottom
Pipe and described sleeve pipe pressure testing are to scheduled pressure value and when keeping not piercing leakage, through the oil pipe into the high temperature and pressure absorption well
The pre- blocking agent of high temperature is injected, the pre- blocking agent of high temperature is squeezed into the leakage oil reservoir；
Second coolant liquid injection module, it is cooling for injecting second into the high temperature and pressure absorption well by the oil pipe
Liquid；
High temperature sealing agent injection module, for being down to the second preset temperature when the temperature for newly making shaft bottom, and to described
When the pre- blocking agent initial set of high temperature, high temperature sealing agent, the high temperature envelope are injected into the high temperature and pressure absorption well by the oil pipe
Blocking agent is squeezed into the leakage oil reservoir.
Preferably, further includes: detection module is suppressed, is used for after the first scheduled duration of the high temperature sealing agent Hou Ning, to
It is suppressed in the oil pipe, by the second scheduled duration, detects the pressure drop in the oil pipe, sealing is judged according to the pressure drop
Whether envelope alters technique qualified.
Preferably, further includes: first judgment module, for judging when the pressure drop is less than or equal to preset threshold
Sealing envelope alters technique qualification, and the sealing envelope for completing the high temperature and pressure absorption well alters technological operation.
Preferably, further includes: the second judgment module, for judging that sealing is sealed when the pressure drop is greater than preset threshold
It is unqualified to alter technique；High temperature sealing agent is injected into the high temperature and pressure absorption well by the oil pipe at this point, repeating
Step, until the pressure drop is less than or equal to the preset threshold.
The embodiment of the present invention seals the process altered for carrying out sealing to high temperature and pressure absorption well, first by height
Quartz sand is inserted in warm high pressure absorption well as skeleton, and preliminary closure is formed to leakage oil reservoir, is subsequently implanted into so as to reduce
The pre- blocking agent of high temperature wastage, then to the pre- blocking agent of high temperature injected in high temperature and pressure absorption well formed it is primary pre- block, can
Effectively to block shaft bottom macropore, so as to effectively reduce the wastage on stratum, in this way, subsequent to high temperature and pressure
The high temperature sealing agent injected in absorption well can preferably realize the final closure to leakage oil reservoir.Due to the embodiment of the present invention
For carrying out material used by the process that sealing envelope is altered to high temperature and pressure absorption well, the resistance to height of preferable high temperature resistant is all had
Performance is pressed, so that the embodiment of the present invention can satisfy height for carrying out the process that sealing envelope is altered to high temperature and pressure absorption well
Warm high pressure absorption well seals the process requirements altered to sealing.
The embodiment of the present invention seals the process altered and device for carrying out sealing to high temperature and pressure absorption well, can obtain
Following advantageous effects:
(1) it is beneficial to reduce the wastage in the shaft bottom when high temperature is pre- stifled as skeleton by filling quartz sand.
(2) it uses the pre- blocking agent of high temperature to carry out in a manner of the first slug and the second slug pre- stifled, is beneficial to shaft bottom macropore
Blocking, can effectively reduce the wastage on stratum, lay a good foundation for the closure of subsequent implementation high temperature.
(3) before the pre- stifled and high temperature of high temperature blocks process, coolant liquid is injected into high temperature and pressure absorption well, thus in height
Formation temperature gradient distribution in warm high pressure absorption well, leakage oil can be can smoothly enter by being beneficial to the pre- blocking agent of high temperature and high temperature sealing agent
Layer is that the pre- blocking agent of high temperature and high temperature sealing agent create enough injection lengths, is conducive to control the pre- blocking agent of high temperature and high temperature blocks
It the time that agent pumps in pit shaft, avoids solidifying in advance and bowel lavage.Meanwhile being also advantageous for the pre- blocking agent of high temperature and high temperature sealing agent exists
Undergauge and solidification in oil pipe, casing.
(4) when the pre- stifled and high temperature of progress high temperature blocks, the pre- blocking agent of high temperature and high temperature sealing agent are used reserve one respectively
Quantitative wastage is beneficial to work progress and needs the reserved accuracy for blocking interface location, guarantees the pre- stifled and high temperature envelope of high temperature
Stifled validity.
Referring to following description and accompanying drawings, the particular embodiment of the present invention is disclosed in detail, specifies the principle of the present invention
It can be in a manner of adopted.It should be understood that the embodiment of the present invention is not so limited in range.It is wanted in appended right
In the range of the spirit and terms asked, the embodiment of the present invention includes many changes, modifications and is equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
It uses in other embodiments, is combined with the feature in other embodiments, or the feature in substitution other embodiments.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when using herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, one integral piece, step or component.
Detailed description of the invention
Attached drawing described here is only used for task of explanation, and is not intended to limit model disclosed by the invention in any way
It encloses.In addition, shape and proportional sizes of each component in figure etc. are only schematical, it is used to help the understanding of the present invention, and
It is not the specific shape and proportional sizes for limiting each component of the present invention.Those skilled in the art under the teachings of the present invention, can
Implement the present invention to select various possible shapes and proportional sizes as the case may be.In the accompanying drawings:
Fig. 1 is the embodiment of the present invention for carrying out the process for the process that sealing envelope is altered to high temperature and pressure absorption well
Figure；
Fig. 2 is the embodiment of the present invention for carrying out the module for the process unit that sealing envelope is altered to high temperature and pressure absorption well
Figure.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to guarantor of the present invention
The range of shield.
It should be noted that it can directly on the other element when element is referred to as " being set to " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not offered as being unique embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more phases
Any and all combinations of the listed item of pass.
Fig. 1 is that a kind of of one embodiment of the invention seals the process altered for carrying out sealing to high temperature and pressure absorption well
Flow chart.Although the present invention provides as the following examples or method operating procedure described in flow chart, based on conventional
It perhaps in the method may include more or less operating procedure without creative labor.In addition, the method
In the step of there is no necessary causalities in logicality, the execution sequence of these steps is not limited to institute in the embodiment of the present invention
Offer executes sequence.Specifically, the present embodiment seals the process packet altered for carrying out sealing to high temperature and pressure absorption well
Include following steps:
Step S10: quartz sand is inserted into the high temperature and pressure absorption well by oil pipe, the quartz sand is filled and occupied
The oil pipe is located at artificial bottom of a well to the first volume space between the leakage oil reservoir upper bound, the part of the high temperature and pressure absorption well
The quartz sand is squeezed into the leakage oil reservoir；At this point, the upper bound of the quartz sand, which is formed, newly makes shaft bottom；
Step S20: the first coolant liquid is injected into the high temperature and pressure absorption well by the oil pipe；
Step S30: connection surface line carries out pressure testing to the oil pipe and casing by the surface line；
Step S40: when the temperature for newly making shaft bottom is down to the first preset temperature, and the oil pipe and described sleeve pipe pressure testing
When keeping not piercing leakage to scheduled pressure value, the pre- blocking agent of high temperature is injected into the high temperature and pressure absorption well by the oil pipe,
The pre- blocking agent of high temperature is squeezed into the leakage oil reservoir；
Step S50: the second coolant liquid is injected into the high temperature and pressure absorption well by the oil pipe；
Step S60: when the temperature for newly making shaft bottom is down to the second preset temperature, and to the pre- blocking agent initial set of the high temperature
When, high temperature sealing agent is injected into the high temperature and pressure absorption well by the oil pipe, the high temperature sealing agent squeezes into the leakage
It loses in oil reservoir.
It is altered in technical field carrying out sealing envelope to viscous crude absorption well, general downhole temperature is greater than 100 DEG C and is considered high
Temperature, pressure reach 3MPa or more and are considered high pressure.
In the present embodiment, quartz sand is inserted into high temperature and pressure absorption well by oil pipe as skeleton, to leakage oil reservoir
Formed it is preliminary block, implement the wastage of high temperature pre- blocking agent when high temperature pre- stifled process in subsequent step S40 to reduce.Due to stone
The heat resisting and pressure resisting performance of sand is preferable, therefore, although before the filling process for implementing quartz sand, in high temperature and pressure absorption well
Temperature and pressure are higher, the Intensity attribute that quartz sand still can keep its intrinsic.
The filling amount of quartz sand, after should meeting completion filling, the upper bound of quartz sand reaches the upper bound of leakage oil reservoir, thus stone
The upper bound of sand, which is formed, newly makes shaft bottom.Specifically, the filling amount of quartz sand can be obtained according to W=V*1.6*1000.Wherein, W is
The individual well dosage (kg) of quartz sand, V are the volume (m of the first volume space3).The volume V=π r of first volume spaceOil 2h1,
In, rOilFor the internal diameter (m) of oil pipe, h1The height (m) between the oil reservoir upper bound is extremely missed for the artificial bottom of a well of high temperature and pressure absorption well.
In the implementation process of entire process, the temperature in shaft bottom is newly made using the measurement of elementary errors tester.Due to high temperature
High pressure absorption well newly makes shaft bottom and rises again fast speed, and borehole pressure is generally higher.Therefore, in the high temperature of implementation steps S40
Before pre- stifled process, need to pit shaft implementation steps S20 to absorption well cooling process, solidified in advance to avoid the pre- blocking agent of high temperature.
Since the specific heat capacity of water is larger, the first coolant liquid preferably uses water, dosage VIt is cold=V1+V2.Wherein, V1For
Into the volume of the first coolant liquid in leakage oil reservoir, V2It is located at the well head extremely leakage oil reservoir of high temperature and pressure absorption well for oil pipe
The volume of the second volume space between the upper bound.
When the measurement of elementary errors tester is newly made the temperature in shaft bottom in first threshold range, V1=π r2ΦH.And when micro-
When poor tester measurement is newly made the temperature in shaft bottom within the scope of second threshold, V1=1.5 π r2ΦH.Wherein, second threshold model
The minimum value enclosed is greater than or equal to the maximum value of first threshold range, for example, first threshold range is [100,200], the first threshold
Being worth range is [200,240].R is the radius (m) for missing oil reservoir, and Φ is the porosity (%) for missing oil reservoir, and H is leakage oil reservoir
Effective thickness (m).The volume V=π r of second volume spaceOil 2h2, wherein rOilFor the internal diameter (m) of oil pipe, h2For high temperature and pressure leakage
Lose the height (m) between the well head extremely upper bound of leakage oil reservoir of well.
When the temperature for newly being made shaft bottom using the measurement of elementary errors tester is down to the first preset temperature of suitable subsequent operation
When, that is, think that the first coolant liquid injection process of step S20 has reached scheduled cooling effect, the high temperature for meeting step S40 is pre-
The temperature condition of stifled process.
In the present embodiment, the first preset temperature is lower than the minimum value of first threshold range, to mention for the pre- blocking agent of high temperature
For enough injection lengths, the pre- blocking agent of high temperature is avoided to solidify in injection process.Therefore, the first preset temperature should be according to practical feelings
Condition carries out free setting, such as can be 70-80 DEG C, and this is not limited by the present invention.
In addition, before the pre- stifled process of high temperature of implementation steps S40, it is also necessary to oil pipe and casing implementation steps S30
Pressure testing process.The purpose for implementing pressure testing to oil pipe and casing is the quartz sand filling process for understanding implementation steps S10, if reach
To scheduled preliminary plugging effect.
Specifically, for example, thinking that the quartz sand filling process of step S10 reaches when oil pipe and casing pressure test are to 20MPa
Scheduled preliminary plugging effect has been arrived, the pressure condition of the pre- stifled process of high temperature of step S40 is met.
After the temperature and pressure condition needed for the pre- blocking agent process of the high temperature of implementation steps S40 obtains satisfaction, Ji Kexiang
The pre- blocking agent of high temperature is injected in high temperature and pressure absorption well.
In the present embodiment, the mode that the pre- blocking agent of high temperature is injected into high temperature and pressure absorption well is, using the first displacement fluid
The pre- blocking agent of high temperature is replaced.First displacement fluid is specifically as follows water.Also, the dosage of first displacement fluid is less than first
Outage, first outage are pre- stifled to the high temperature for the well head that the oil pipe is located at the high temperature and pressure absorption well
Spatial volume between the reserved depth of the first of agent.In this way, the pre- stifled process of high temperature is reserved with certain wastage, it is ensured that envelope
The accuracy of stifled interface location.
In the present embodiment, the first reserved depth of the pre- blocking agent of high temperature, after implantation is completed for the pre- blocking agent of high temperature, the upper end
The theoretical distance value blocked between interface and the well head of high temperature and pressure absorption well.In general, it is wanted for closure quality
It asks, the pre- blocking agent of high temperature is completed to inject, and the closure interface of the upper end will be higher by the upper bound predetermined altitude of leakage oil reservoir, for example,
30m。
But it after being entered in leakage oil reservoir due to the pre- blocking agent of high temperature, can also miss.So as to cause according to above-mentioned reason
When demarcating the dosage of the first displacement fluid by distance value, the pre- blocking agent of high temperature complete the upper end after injection closure interface may under
Drop.Such as the closure interface of the pre- blocking agent upper end of high temperature is only higher by the upper bound 10m of leakage oil reservoir, even, blocks interface and is reduced to leakage
The upper bound of oil reservoir is lost hereinafter, losing plugging action so as to cause pre- blocking agent.
And the embodiment of the present invention by the dosage of the first displacement fluid design less than the first outage, in this way, completing to infuse
After entering, the upper end of the pre- blocking agent of high temperature blocks the distance between interface and the well head of high temperature and pressure absorption well and is able to maintain larger
Value, such as the closure interface of the pre- blocking agent upper end of high temperature are higher by the upper bound 50m for missing oil reservoir.In this way, even the pre- blocking agent of high temperature into
A certain amount of leakage can be occurred by entering after missing in oil reservoir, also can guarantee that the final closure upper bound of the pre- blocking agent of high temperature is higher by leakage oil reservoir
The upper bound, it is ensured that pre- stifled success.
And the dosage of the pre- blocking agent of high temperature, it can be by leakage oil reservoir lower bound between the leakage above preset distance in the oil reservoir upper bound
Casing volume calculates, i.e., the dosage of the pre- blocking agent of high temperature be equal to casing be located at the lower bound of leakage oil reservoir to the upper bound of leakage oil reservoir with
Volume between upper preset distance.The preset distance can carry out free setting according to the actual situation, such as can be 10m, this hair
It is bright that this is not construed as limiting.
In addition, the injection length of the pre- blocking agent of high temperature is most important.When rising again due to newly making shaft bottom, different time points are corresponding
Temperature is different, and the corresponding high temperature of the different temperatures pre- blocking agent presetting period is also different.Therefore, it is being measured based on elementary errors tester
The different temperatures corresponding to speed and different time points of rising again for newly making shaft bottom, determines the injection length of the pre- blocking agent of high temperature, but
It need to guarantee that the injection length of the pre- blocking agent of high temperature controlled within the corresponding high temperature pre- blocking agent presetting period.
In the pre- stifled process of the high temperature of implementation steps S40, it is preferred to use the first pre- blocking agent and the second pre- blocking agent are as first
The mode of slug and the second slug come to leakage oil reservoir blocked in advance.Wherein, the first pre- blocking agent and the second pre- blocking agent difference are excellent
It is selected as phenolic resin and G grades of superfine cements, to meet the environment construction requirement of underground high temperature and pressure.
In addition, being beneficial to well in such a way that the first pre- blocking agent and the second pre- blocking agent are as the first slug and the second slug
The blocking of bottom macropore can effectively reduce the wastage on stratum, lay for the high temperature closure process of subsequent implementation step S60
Good basis.Meanwhile phenolic resin and G grades of superfine cements, the characteristic with high temperature resistant and high pressure can satisfy absorption well
The operational requirements of temperature and pressure in pit shaft.
Likewise, to avoid the generation of high temperature sealing agent from solidifying in advance, before the high temperature of implementation steps S60 blocks process,
Need to pit shaft implementation steps S50 to absorption well cooling process.The property and dosage of second coolant liquid can refer to above-mentioned to first
The description of coolant liquid, therefore not to repeat here.
When the second preset temperature of the near suitable subsequent operation of temperature for newly being made shaft bottom using the measurement of elementary errors tester
When, that is, think that the second coolant liquid injection process of step S50 has reached scheduled cooling effect, meets the high temperature envelope of step S60
The temperature condition of stifled process.Likewise, the second preset temperature can refer to the above-mentioned description to the first preset temperature, do not go to live in the household of one's in-laws on getting married herein
It states.
Moreover the high temperature of implementation steps S60 blocks another condition of process, it is the high temperature in step S40
Pre- blocking agent is in pre-hardening state, is specially in pre-hardening state as the G grade superfine cement of the second slug.It is above-mentioned when meeting simultaneously
After temperature and pre-hardening condition, high temperature sealing agent can be injected into high temperature and pressure absorption well.
In the present embodiment, the mode that high temperature sealing agent is injected into high temperature and pressure absorption well is, using the second displacement fluid
High temperature sealing agent is replaced.Second displacement fluid is specifically as follows water.Also, the dosage of second displacement fluid is less than second
Outage, second outage block for well head to the high temperature that the oil pipe is located at the high temperature and pressure absorption well
Spatial volume between the reserved depth of the second of agent.In this way, high temperature, which blocks process, is reserved with certain wastage, guarantee to block boundary
The accuracy of face position.Likewise, the second outage can refer to the description to the first outage above, the present invention is herein not
It repeats.
In the present embodiment, the dosage of high temperature sealing agent can be according to VIt is stifled=π r2Φ H is obtained.Wherein, r is leakage oil reservoir
Radius (m), Φ are the porosity (%) for missing oil reservoir, and H is the effective thickness (m) for missing oil reservoir.
Likewise, the injection length of high temperature sealing agent is most important.Its specific injection length can refer to above-mentioned to high temperature
The description of the injection length of pre- blocking agent, therefore not to repeat here.
After the process for completing above-mentioned steps S10 to step S60, that is, complete to seal the sealing of one round of high temperature and pressure absorption well
Alter operation.At this point it is possible to which the effect for altering operation to the sealing envelope of a round is tested.As shown in Figure 1, specific checked operation
Mode is as follows:
Step S70: it after the first scheduled duration of the high temperature sealing agent Hou Ning, is suppressed in Xiang Suoshu oil pipe, by second
Scheduled duration detects the pressure drop in the oil pipe, judges whether sealing envelope alters technique qualified according to the pressure drop.
In the present embodiment, the first scheduled duration of high temperature sealing agent Hou Ning and after suppressing by the second duration can basis
Actual conditions are set, such as can be respectively for 24 hours and 30min, and this is not limited by the present invention.It suppresses and reaches into oil pipe
Scheduled pressure value is, for example, 15MPa, after the second predetermined time, using the pressure drop Δ in pressure-detecting device detection oil pipe
P, and judge whether sealing envelope alters technique qualified according to pressure drop Δ P.Specific judgment mode is as follows:
Step S701: when the pressure drop is less than or equal to preset threshold, judges that sealing envelope alters technique qualification, complete institute
The sealing envelope for stating high temperature and pressure absorption well alters technological operation.
Step S702: when the pressure drop is greater than preset threshold, it is unqualified to judge that sealing envelope alters technique；At this point, repeating to hold
The step of row injects high temperature sealing agent by the oil pipe into the high temperature and pressure absorption well, until the pressure drop is less than or waits
Until the preset threshold.
In the present embodiment, preset threshold can be set according to the actual situation, such as can be 0.5MPa, the present invention couple
This is not construed as limiting.When pressure drop Δ P is less than or equal to 0.5MPa, that is, after the process for thinking implementation steps S10 to step S60,
The leakage oil reservoir of high temperature and pressure absorption well is effectively blocked.At this point, can be completed and terminate entire high temperature and pressure absorption well
Sealing envelope alter technological operation.
And if pressure drop Δ P be greater than 0.5MPa when, that is, implement a round sealing envelope alter operation after, high temperature and pressure leakage
The leakage oil reservoir of well may not blocked effectively.At this point, the high temperature of repeatable step S60 blocks process, then again
The pressure testing and detection operation for executing step S70, to be examined again to plugging effect, until pressure drop Δ P is decreased below
Or until being equal to preset threshold.
The embodiment of the present invention seals the process altered for carrying out sealing to high temperature and pressure absorption well, first by height
Quartz sand is inserted in warm high pressure absorption well as skeleton, and preliminary closure is formed to leakage oil reservoir, is subsequently implanted into so as to reduce
The pre- blocking agent of high temperature wastage, then to the pre- blocking agent of high temperature injected in high temperature and pressure absorption well formed it is primary pre- block, can
Effectively to block shaft bottom macropore, so as to effectively reduce the wastage on stratum, in this way, subsequent to high temperature and pressure
The high temperature sealing agent injected in absorption well can preferably realize the final closure to leakage oil reservoir.Due to the embodiment of the present invention
For carrying out material used by the process that sealing envelope is altered to high temperature and pressure absorption well, the resistance to height of preferable high temperature resistant is all had
Performance is pressed, so that the embodiment of the present invention can satisfy height for carrying out the process that sealing envelope is altered to high temperature and pressure absorption well
Warm high pressure absorption well seals the process requirements altered to sealing.
The embodiment of the present invention seals the process altered for carrying out sealing to high temperature and pressure absorption well, can obtain following
Advantageous effects:
(1) it is beneficial to reduce the wastage in the shaft bottom when high temperature is pre- stifled as skeleton by filling quartz sand.
(2) it uses the pre- blocking agent of high temperature to carry out in a manner of the first slug and the second slug pre- stifled, is beneficial to shaft bottom macropore
Blocking, can effectively reduce the wastage on stratum, lay a good foundation for the closure of subsequent implementation high temperature.
(3) before the pre- stifled and high temperature of high temperature blocks process, coolant liquid is injected into high temperature and pressure absorption well, thus in height
Formation temperature gradient distribution in warm high pressure absorption well, leakage oil can be can smoothly enter by being beneficial to the pre- blocking agent of high temperature and high temperature sealing agent
Layer is that the pre- blocking agent of high temperature and high temperature sealing agent create enough injection lengths, is conducive to control the pre- blocking agent of high temperature and high temperature blocks
It the time that agent pumps in pit shaft, avoids solidifying in advance and bowel lavage.Meanwhile being also advantageous for the pre- blocking agent of high temperature and high temperature sealing agent exists
Undergauge and solidification in oil pipe, casing.
(4) when the pre- stifled and high temperature of progress high temperature blocks, the pre- blocking agent of high temperature and high temperature sealing agent are used reserve one respectively
Quantitative wastage is beneficial to work progress and needs the reserved accuracy for blocking interface location, guarantees the pre- stifled and high temperature envelope of high temperature
Stifled validity.
Based on same design, one embodiment of the invention additionally provides a kind of for carrying out sealing to high temperature and pressure absorption well
The process unit altered is sealed, as described in the following examples.Due to sealing the technique altered for carrying out sealing to high temperature and pressure absorption well
The principle that device solves the problems, such as, and the technical effect that can obtain with for carrying out what sealing envelope was altered to high temperature and pressure absorption well
Process is similar, is accordingly used in may refer to the implementation that high temperature and pressure absorption well progress sealing seals the process unit altered above-mentioned
For carrying out the implementation for the process that sealing envelope is altered to high temperature and pressure absorption well, overlaps will not be repeated.It is following to be used
Term " module ", can be based on software realization, be also possible to can also be the side with software and hardware combining based on hardware realization
Formula is realized.
Referring to Fig. 2, the embodiment of the present invention seals the process unit packet altered for carrying out sealing to high temperature and pressure absorption well
Include: quartz sand inserts module 10, the first coolant liquid injection module 20, pressure testing module 30, the pre- blocking agent injection module 40, second of high temperature
Coolant liquid injection module 50 and high temperature sealing agent injection module 60.Wherein,
Quartz sand filling module 10 can be used for inserting quartz sand into the high temperature and pressure absorption well by oil pipe, described
Quartz sand, which fills and occupies the oil pipe, is located at the artificial bottom of a well of the high temperature and pressure absorption well between the leakage oil reservoir upper bound
First volume space, the part quartz sand are squeezed into the leakage oil reservoir；At this point, the upper bound of the quartz sand, which is formed, newly makes well
Bottom.
First coolant liquid injection module 20 is cold for injecting first into the high temperature and pressure absorption well by the oil pipe
But liquid.
Pressure testing module 30 carries out pressure testing to the oil pipe and casing for connecting surface line, by the surface line.
The pre- blocking agent injection module 40 of high temperature is used to be down to the first preset temperature, and the oil when the temperature for newly making shaft bottom
Pipe and described sleeve pipe pressure testing are to scheduled pressure value and when keeping not piercing leakage, through the oil pipe into the high temperature and pressure absorption well
The pre- blocking agent of high temperature is injected, the pre- blocking agent of high temperature is squeezed into the leakage oil reservoir.
Second coolant liquid injection module 50 is cold for injecting second into the high temperature and pressure absorption well by the oil pipe
But liquid.
High temperature sealing agent injection module 60 is used to be down to the second preset temperature when the temperature for newly making shaft bottom, and to described
When the pre- blocking agent initial set of high temperature, high temperature sealing agent, the high temperature envelope are injected into the high temperature and pressure absorption well by the oil pipe
Blocking agent is squeezed into the leakage oil reservoir.
Further, in a preferred embodiment, the technique altered is sealed for carrying out sealing to high temperature and pressure absorption well
Device further include: suppress detection module 70, first judgment module 701, the second judgment module 702.Wherein,
Detection module 70 is suppressed for being beaten after the first scheduled duration of the high temperature sealing agent Hou Ning in Xiang Suoshu oil pipe
Pressure, by the second scheduled duration, detects the pressure drop in the oil pipe, judges whether sealing envelope alters technique according to the pressure drop
It is qualified.
First judgment module 701 is used for when the pressure drop is less than or equal to preset threshold, judges that sealing envelope alters technique
Qualification, the sealing envelope for completing the high temperature and pressure absorption well alter technological operation.
Second judgment module 702 is used for when the pressure drop is greater than preset threshold, and it is unqualified to judge that sealing envelope alters technique；
At this point, the step of injecting high temperature sealing agent into the high temperature and pressure absorption well by the oil pipe is repeated, until the pressure
Until power drop is less than or equal to the preset threshold.
It should be noted that in the description of the present invention, term " first ", " second " etc. are used for description purposes only and distinguish
Similar object between the two and is not present sequencing, can not be interpreted as indication or suggestion relative importance.In addition,
In description of the invention, unless otherwise indicated, the meaning of " plurality " is two or more.
Herein cited any digital value all include between lower limit value to upper limit value with the lower value of an incremented and
The all values of upper value, there are the intervals of at least two units between any lower value and any much higher value.For example, such as
Fruit elaborates that the quantity an of component or the value of process variable (such as temperature, pressure, time etc.) are from 1 to 90, preferably from 21
To 80, more preferably from 30 to 70, then purpose is arrived in order to illustrate also clearly listing such as 15 to 85,22 in the specification
68,43 to 51,30 to 32 is equivalent.For the value less than 1, suitably think that a unit is 0.0001,0.001,0.01,0.1.
These are only intended to the example clearly expressed, it is believed that all possibility for the numerical value enumerated between minimum and peak
Combination is all expressly set forth in the specification in a similar manner.
Unless otherwise indicated, all ranges all include all numbers between endpoint and endpoint.It is used together with range
" about " or " approximation " be suitable for two endpoints of the range.Thus, " about 20 to 30 " are intended to cover that " about 20 to about
30 ", including at least the endpoint indicated.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch
It states, many embodiments and many applications except provided example all will be aobvious and easy for a person skilled in the art
See.Therefore, the range of this introduction should not be determined referring to foregoing description, but should referring to preceding claims and this
The full scope of the equivalent that a little claims are possessed determines.Theme disclosed herein is omitted in preceding claims
Any aspect is not intended to abandon the body matter, also should not be considered as applicant the theme is not thought of as it is disclosed
Apply for a part of theme.
Claims (16)
1. a kind of seal the process altered for carrying out sealing to high temperature and pressure absorption well characterized by comprising
Quartz sand is inserted into the high temperature and pressure absorption well by oil pipe, the quartz sand, which fills and occupies the oil pipe, to be located at
The artificial bottom of a well of the high temperature and pressure absorption well to the first volume space between the leakage oil reservoir upper bound, the part quartz sand squeezes
Enter in the leakage oil reservoir；At this point, the upper bound of the quartz sand, which is formed, newly makes shaft bottom；
The first coolant liquid is injected into the high temperature and pressure absorption well by the oil pipe；
Surface line is connected, pressure testing is carried out to the oil pipe and casing by the surface line；
When the temperature for newly making shaft bottom is down to the first preset temperature, and the oil pipe and described sleeve pipe pressure testing are to scheduled pressure value
And when keeping not piercing leakage, the pre- blocking agent of high temperature is injected into the high temperature and pressure absorption well by the oil pipe, the high temperature is pre- stifled
Agent is squeezed into the leakage oil reservoir；
The second coolant liquid is injected into the high temperature and pressure absorption well by the oil pipe；
It newly makes the temperature in shaft bottom when described and is down to the second preset temperature, and when the high temperature pre- blocking agent initial set, pass through the oil
Pipe injects high temperature sealing agent into the high temperature and pressure absorption well, and the high temperature sealing agent is squeezed into the leakage oil reservoir.
2. as described in claim 1 seal the process altered for carrying out sealing to high temperature and pressure absorption well, which is characterized in that
In the step of inserting quartz sand into the high temperature and pressure absorption well by oil pipe, the filling amount of the quartz sand is according to following formula
It obtains:
W=V*1.6*1000；
Wherein, W is the individual well dosage of the quartz sand, kg；V is the volume of first volume space, m3。
3. as described in claim 1 seal the process altered for carrying out sealing to high temperature and pressure absorption well, which is characterized in that
In the step of injecting the first coolant liquid or the second coolant liquid into the high temperature and pressure absorption well by the oil pipe, described
The dosage V of one coolant liquid or second coolant liquidIt is cold=V1+V2, V1For the first coolant liquid or the entered in the leakage oil reservoir
The volume of two coolant liquids, V2For the oil pipe be located at the well head of the high temperature and pressure absorption well to the upper bound of the leakage oil reservoir it
Between the second volume space volume；
When it is described newly make the temperature in shaft bottom in first threshold range when, V1=π r2ΦH；
When it is described newly make the temperature in shaft bottom within the scope of second threshold when, V1=1.5 π r2ΦH；
Wherein, the minimum value of the second threshold range is greater than or equal to the maximum value of the first threshold range, and r is the leakage
Lose the radius of oil reservoir, m；Φ is the porosity of the leakage oil reservoir, %；H is the effective thickness of the leakage oil reservoir, m.
4. as described in claim 1 seal the process altered for carrying out sealing to high temperature and pressure absorption well, which is characterized in that
In the step of injecting the pre- blocking agent of high temperature into the high temperature and pressure absorption well by the oil pipe, using the first displacement fluid to institute
It states the pre- blocking agent of high temperature to be replaced, less than the first outage, first outage is the dosage of first displacement fluid
The oil pipe is located at the well head of the high temperature and pressure absorption well to the space between the first reserved depth of the pre- blocking agent of the high temperature
Volume.
5. as described in claim 1 seal the process altered for carrying out sealing to high temperature and pressure absorption well, which is characterized in that
In the step of injecting the pre- blocking agent of high temperature into the high temperature and pressure absorption well by the oil pipe, the use of the pre- blocking agent of high temperature
Amount is equal to described sleeve pipe and is located at the lower bound for missing oil reservoir to the appearance between the above preset distance in the upper bound of the leakage oil reservoir
Product.
6. as described in claim 1 seal the process altered for carrying out sealing to high temperature and pressure absorption well, which is characterized in that
In the step of injecting the pre- blocking agent of high temperature into the high temperature and pressure absorption well by the oil pipe, using the first pre- blocking agent and
Two pre- blocking agents block the leakage oil reservoir as the mode of the first slug and the second slug in advance.
7. as claimed in claim 6 seal the process altered for carrying out sealing to high temperature and pressure absorption well, which is characterized in that
The first pre- blocking agent is phenolic resin, and the second pre- blocking agent is G grades of superfine cements.
8. as described in claim 1 seal the process altered for carrying out sealing to high temperature and pressure absorption well, which is characterized in that
In the step of injecting high temperature sealing agent into the high temperature and pressure absorption well by the oil pipe, using the second displacement fluid to institute
It states high temperature sealing agent to be replaced, less than the second outage, second outage is the dosage of second displacement fluid
The oil pipe is located at the well head of the high temperature and pressure absorption well to the space between the second reserved depth of the high temperature sealing agent
Volume.
9. as described in claim 1 seal the process altered for carrying out sealing to high temperature and pressure absorption well, which is characterized in that
In the step of injecting high temperature sealing agent into the high temperature and pressure absorption well by the oil pipe, the use of the high temperature sealing agent
Amount is obtained according to following formula:
VIt is stifled=π r2ΦH；
Wherein, r is the radius of the leakage oil reservoir, m；Φ is the porosity of the leakage oil reservoir, %；H is the leakage oil reservoir
Effective thickness, m.
10. as described in claim 1 seal the process altered for carrying out sealing to high temperature and pressure absorption well, feature exists
In, after the first scheduled duration of the high temperature sealing agent Hou Ning, suppressed in Xiang Suoshu oil pipe, by the second scheduled duration, detection
Pressure drop in the oil pipe judges whether sealing envelope alters technique qualified according to the pressure drop.
11. as claimed in claim 10 seal the process altered for carrying out sealing to high temperature and pressure absorption well, feature exists
In judging that sealing envelope alters technique qualification, complete high temperature and pressure leakage when the pressure drop is less than or equal to preset threshold
The sealing envelope of well alters technological operation.
12. as claimed in claim 10 seal the process altered for carrying out sealing to high temperature and pressure absorption well, feature exists
In judging that alter technique unqualified for sealing envelope when the pressure drop is greater than preset threshold；At this point, repeating through the oil
Pipe injects the step of high temperature sealing agent into the high temperature and pressure absorption well, until the pressure drop is less than or equal to the default threshold
Until value.
13. a kind of seal the process unit altered for carrying out sealing to high temperature and pressure absorption well characterized by comprising
Quartz sand inserts module, and for inserting quartz sand into the high temperature and pressure absorption well by oil pipe, the quartz sand is filled out
Fill and occupy the first volume that the oil pipe is located between the artificial bottom of a well extremely leakage oil reservoir upper bound of the high temperature and pressure absorption well
Space, the part quartz sand are squeezed into the leakage oil reservoir；At this point, the upper bound of the quartz sand, which is formed, newly makes shaft bottom；
First coolant liquid injection module, for injecting the first coolant liquid into the high temperature and pressure absorption well by the oil pipe；
Pressure testing module carries out pressure testing to the oil pipe and casing by the surface line for connecting surface line；
The pre- blocking agent injection module of high temperature, for being down to the first preset temperature when the temperature for newly making shaft bottom, and the oil pipe and
When described sleeve pipe pressure testing keeps not piercing leakage to scheduled pressure value, injected by the oil pipe into the high temperature and pressure absorption well
The pre- blocking agent of high temperature, the pre- blocking agent of high temperature are squeezed into the leakage oil reservoir；
Second coolant liquid injection module, for injecting the second coolant liquid into the high temperature and pressure absorption well by the oil pipe；
High temperature sealing agent injection module, for being down to the second preset temperature when the temperature for newly making shaft bottom, and to the high temperature
When pre- blocking agent initial set, high temperature sealing agent, the high temperature sealing agent are injected into the high temperature and pressure absorption well by the oil pipe
It squeezes into the leakage oil reservoir.
14. as claimed in claim 13 seal the process unit altered for carrying out sealing to high temperature and pressure absorption well, feature exists
In, further includes: detection module is suppressed, for being beaten after the first scheduled duration of the high temperature sealing agent Hou Ning in Xiang Suoshu oil pipe
Pressure, by the second scheduled duration, detects the pressure drop in the oil pipe, judges whether sealing envelope alters technique according to the pressure drop
It is qualified.
15. as claimed in claim 14 seal the process unit altered for carrying out sealing to high temperature and pressure absorption well, feature exists
In, further includes: first judgment module, for when the pressure drop is less than or equal to preset threshold, judging that sealing envelope alters technique
Qualification, the sealing envelope for completing the high temperature and pressure absorption well alter technological operation.
16. as claimed in claim 14 seal the process unit altered for carrying out sealing to high temperature and pressure absorption well, feature exists
In, further includes: the second judgment module, it is unqualified for when the pressure drop is greater than preset threshold, judging that sealing envelope alters technique；
At this point, the step of injecting high temperature sealing agent into the high temperature and pressure absorption well by the oil pipe is repeated, until the pressure
Until power drop is less than or equal to the preset threshold.
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| CN201811357523.6A CN109403936B (en) | 2018-11-15 | 2018-11-15 | Process method and device for sealing high-temperature and high-pressure leakage well |
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