CN105626018A - Method for determining well killing start time and well killing method - Google Patents
Method for determining well killing start time and well killing method Download PDFInfo
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- CN105626018A CN105626018A CN201410596756.7A CN201410596756A CN105626018A CN 105626018 A CN105626018 A CN 105626018A CN 201410596756 A CN201410596756 A CN 201410596756A CN 105626018 A CN105626018 A CN 105626018A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000003129 oil well Substances 0.000 claims abstract description 80
- 208000028659 discharge Diseases 0.000 claims description 49
- 239000012530 fluid Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 238000011282 treatment Methods 0.000 claims description 11
- 239000010865 sewage Substances 0.000 claims description 10
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 7
- 230000001186 cumulative effect Effects 0.000 claims description 7
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 27
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 23
- 238000010793 Steam injection (oil industry) Methods 0.000 description 10
- 239000003208 petroleum Substances 0.000 description 8
- 238000013022 venting Methods 0.000 description 7
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004836 empirical method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 229910052601 baryte Inorganic materials 0.000 description 2
- 239000010428 baryte Substances 0.000 description 2
- 230000036772 blood pressure Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000002595 cold damage Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a well killing start time determining method and a well killing method. The method for determining the well killing start time comprises the following steps: step S1: acquiring oil well data, wherein the oil well data comprises a steam cavity volume V, a steam cavity pressure P and an oil reservoir depth h, and calculating the time T for discharging and releasing the liquid once according to the oil well data; step S2: carrying out primary liquid drainage and pressure relief on the oil well, wherein the time for the primary liquid drainage and pressure relief is T; step S3: and carrying out pre-killing well test on the oil well, and judging the well killing start time according to the result of the pre-killing well test. By applying the technical scheme of the invention, workers can accurately determine the well killing start time of the oil well needing well killing, so that the determination of the well killing start time among different oil wells can be scientifically judged according to theoretical calculation results instead of estimating the well killing start time only according to experience.
Description
Technical field
The present invention relates to field of petroleum exploitation, in particular to defining method and the well killing method of a kind of kill-job time started.
Background technology
SAGD is the Technology for super-viscous oil is exploited. In this Technology, generally adopt the hole pattern of parallel double horizontal well: upper horizontal well is steam injection well, and lower horizontal well is producing well. In the production process of exploitation, upper horizontal well continuous steam injection, lower horizontal well recover the oil continuously.
Utilizing SAGD Technology to carry out in the process of exploitation oil, steam injection well continues steam injection, and along with the time lengthening of recovery process, vapor chamber is generally divided into ascent stage, stage extending transversely, decline stage three phases. Ascent stage and the stage extending transversely in vapor chamber, the scale of vapor chamber expands gradually, correspondingly, the energy having in vapor chamber is more and more higher, this is by the reason at difficulty place of SAGD well workover treatment, and this is also and the conventional thermal production well workover treatment maximum difference in potential safety hazard.
In SAGD well production process, staff typically requires the work carrying out the workover treatments such as rotating shaft operation, inspection pump, replacing down-hole string. But, the downhole temperature of SAGD well high (generally more than 200 DEG C), staff can not be made directly workover treatment work. Staff is before carrying out operation, it is necessary in advance SAGD well is lowered the temperature, the work of blood pressure lowering fully kill-job, to ensure the safety of operation.
Staff carries out SAGD kill-job work, before kill-job, generally adopt steam injection well stop note, producing well discharge opeing mode to reduce the temperature and pressure of down-hole, in order to provide condition for effective kill-job. Along with the difference of the factors such as the development phase of SAGD well, development degree, operating condition, reservoir condition, the time phase difference of SAGD single well voltage leakage is very big. In the oil well of same batch of exploitation, the same batch of SAGD well gone into operation, required for the well of venting duration length for up to 100 120 days, and the time required for the short well of venting duration only needs 10 20 days, there is very big difference between this. And, whether the determination of kill-job time started can effectively kill-job and whether vapor chamber can be injured, reservoir damage, well killing fluid consumption size is all had have a great impact for.
In prior art, the defining method of the kill-job time started of SAGD horizontal well adopts well head parameter as basis for estimation, and in the process of discharge opeing pressure release, the temperature and pressure of SAGD well progressively declines. Staff, by analyzing steam injection well casing pressure, lines of producing wells liquid temp, pressure and Liquid output, can tentatively judge whether possess effective kill-job condition. Staff is analyzed according to the case of the effective kill-job of SAGD well before, obtains some experiences determining the kill-job time started, and experience is thought, wellhead temperature is lower than 100 DEG C, discharge opeing pressure is lower than 0.5MPa, and Liquid output, lower than 50 ton day, meets conditions above and can carry out kill-job.
In order to ensure the safety of the workover treatment of SAGD well, staff is before carrying out kill-job operation, it usually needs in advance SAGD steam injection well is stopped steam injection, meanwhile, utilizes producing well to carry out discharge opeing, to reach the purpose needing to carry out the cooling of the well of operation, blood pressure lowering. The length of SAGD well array liquid venting duration, success rate and vapor chamber extent of injury to kill-job directly affect. Under normal circumstances, the kill-job time started is too early, and kill-job success rate is low, and well killing fluid consumption is big, and this will expend a large amount of manpower and materials; The kill-job time started, vapor chamber temperature, pressure reduced too much, causes vapor chamber to shrink, affects the recovery of the post-job Petroleum Production of kill-job too late, even resulted in communicating passage Guan Bi good between injection-production well, thus affecting follow-up Petroleum Production effect.
In the prior art, big for kill-job difficulty or the well of comparatively significantly overflow phenomena still occurs in follow-up petroleum production operation process, the materials such as staff generally adopts barite, barium sulfate strengthen well killing fluid density, to improve kill-job success rate.
Prior art adopts standard empirical method to determine the kill-job time started, there is following several respects shortcoming:
1, the kill-job time started judgement of SAGD well and the influence factor of kill-job job success ratio are many, the determination of kill-job time started is based on experience to through carrying out kill-job by prior art, this defining method empirically determining the kill-job time started does not have versatility, and on-the-spot kill-job situation shows, SAGD well adopts empirical method to determine the poor effect of kill-job time started.
2, due to the kill-job time started judge inaccurate, the well that the kill-job time started is too early, need the temperature adopting substantial amounts of well killing fluid can be effectively reduced shaft bottom, connection between vapor chamber and SAGD injection-production well is easily caused cold damage by this kill-job operation, the recovery difficulty carrying out Petroleum Production after kill-job operation is complete is big, simultaneously need to bigger well killing fluid consumption, thus add the cost of kill-job operation.
3, in order to ensure the success rate of kill-job, the heavy material such as the well big for kill-job difficulty adopts barite, barium sulfate, this operation process easily causes reservoir damage, thus affecting the effect of Petroleum Production, or the problem etc. of blocking screen casing occurs.
4, kill-job time started well too late, downhole temperature excessively reduces, and wastes the heat in vapor chamber, causes vapor chamber to shrink, even result in the effective connected ratio between injection-production well to reduce, thus have impact on the recovery of follow-up Petroleum Production and have impact on the effect of Petroleum Production.
Many owing to SAGD horizontal well to be carried out the influence factor that the kill-job time started determines, and interactional relation is complex, therefore, not yet forms relative theory analysis and method that the kill-job time started about SAGD horizontal well is determined at present.
Summary of the invention
It is desirable to provide the defining method of a kind of kill-job time started and well killing method, with the problem solving not have versatility according to kill-job experience to the empirical method carrying out kill-job in prior art.
To achieve these goals, according to an aspect of the invention, it is provided the defining method of a kind of kill-job time started, it is characterised in that: comprise the following steps:
Step S1: obtain well data, well data includes vapour cavity volume V, vapour cavity pressure P and oil reservoir degree of depth h, and calculates the time T of a discharge opeing pressure release according to well data;
Step S2: oil well is carried out a discharge opeing pressure release, the time of a discharge opeing pressure release is T;
Step S3: oil well is carried out precompressed well surveying examination, and the result according to the examination of precompressed well surveying judges the kill-job time started.
Further, in step sl, the formula of the time T calculating a discharge opeing pressure release is: T=a ��+b, wherein, a=1.9133, b=30.051,
Further, in step sl, vapour cavity volume V is calculated by the cumulative oil production of oil well.
Further, the result according to the examination of precompressed well surveying judges that the kill-job time started includes:
As a result 1: the well head of oil well does not have excessive fluid, then judge that any time in the stipulated time range lambda after the examination of precompressed well surveying is as the kill-job time started, wherein, 0�ܦˡ�60min;
As a result 2: the well head of oil well has excessive fluid, then oil well carries out secondary discharge opeing pressure release, and the time of secondary discharge opeing pressure release is t, then repeat step S3, until the kill-job time started is determined.
Further, time t calculates according to �� (t+T)=�� T, and wherein, �� is actual discharge opeing flow velocity, and �� is normal drainage flow velocity.
According to a further aspect in the invention, it is provided that a kind of well killing method, comprise the following steps:
Step S10: when carrying out discharge opeing pressure release with normal drainage flow velocity ��, carries out the discharge opeing pressure release of time T to oil well, and wherein, time T is the time T of a discharge opeing pressure release of claim 1 or 2;
Step S20: determine the kill-job time started;
Step S30: start kill-job within the scope of the stipulated time after the kill-job time started, wherein, it is stipulated that time range is ��, 0�ܦˡ�60min.
Further, in step s 30, utilizing the hot sewage of removing oil to carry out kill-job as well killing fluid, wherein, the temperature of the hot sewage of removing oil is in default temperature range.
Further, the temperature of the hot sewage of removing oil is Q, 60 DEG C��Q��70 DEG C.
Further, after well killing fluid returns producing well well head, closing the shaft collar of oil well, shaft collar opened by the stewing well through the scheduled time after standing, and the overflow result according to well mouth of oil well judges that whether kill-job is successful.
Further, the scheduled time is �� T, �� T >=30min.
Further, after judging kill-job success, and before carrying out follow-up workover treatment, the hydrogen sulfide in alkali liquor and in oil well is adopted.
Further, in and hydrogen sulfide after, and before carrying out follow-up workover treatment, adopt cooling water pressure well to cool down tubing string in well.
Application technical scheme, before the kill-job carrying out oil well operates, first the time started of kill-job is determined, this is wherein, staff first has to obtain the relevant well data of this oil well, namely staff needs acquisition well data to include vapour cavity volume V, vapour cavity pressure P and oil reservoir degree of depth h, then the time started of kill-job is calculated by staff according to measuring the relevant well data obtained, to determine the theoretical time started T of kill-job, the personnel that proceed with one's work carry out the discharge opeing pressure release before formal kill-job according to the time T calculated, after this oil well be have passed through the discharge opeing pressure release of time T (when namely having reached the time started of predetermined kill-job), whether staff is now time started of correct kill-job to determine better, also this oil well is carried out the test of pre-kill-job, then staff judges to be whether now correct kill-job time started according to the result of pre-kill-job. application technical scheme, staff can to the work needing the oil well carrying out kill-job to accurately determine the kill-job time started, the kill-job time started between for different oil wells is made really to establish a capital and can carry out science judgment according to the calculated results, and be no longer to surmise the time that kill-job starts only according to experience, therefore, the defining method of kill-job time started provided by the invention has the scope of application widely, improves staff and oil well carries out the success rate of kill-job.
Accompanying drawing explanation
The accompanying drawing constituting the part of the present invention is used for providing a further understanding of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention. In the accompanying drawings:
The workflow diagram of Fig. 1 illustrates embodiments of the invention level pressure well time started really;
Fig. 2 illustrates the kill-job flow chart of embodiments of the invention;
Fig. 3 illustrates the horizontal well distribution schematic diagram of embodiments of the invention;
Fig. 4 illustrates the horizontal elevational schematic of embodiments of the invention;
Fig. 5 illustrates the linear relationship schematic diagram of embodiments of the invention.
Description of reference numerals:
10, upper horizontal well; 20, lower horizontal well.
Detailed description of the invention
Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments. It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.
As shown in Figures 1 to 4, according to embodiments of the invention, one aspect of the present invention provides the defining method of a kind of kill-job time started. The defining method of this kill-job time started comprises the following steps:
Step S1: obtain well data, well data includes vapour cavity volume V, vapour cavity pressure P and oil reservoir degree of depth h, and calculates the time T of a discharge opeing pressure release according to well data;
Step S2: oil well is carried out a discharge opeing pressure release, the time of a discharge opeing pressure release is T;
Step S3: oil well carries out precompressed well surveying examination, judges the kill-job time started according to the result of precompressed well surveying examination.
Before the kill-job carrying out oil well operates, first the time started of kill-job is determined, this is wherein, staff first has to obtain the relevant well data of this oil well, namely staff needs acquisition well data to include vapour cavity volume V, vapour cavity pressure P and oil reservoir degree of depth h, then the time started of kill-job is calculated by staff according to measuring the relevant well data obtained, to determine the theoretical time started T of kill-job, the personnel that proceed with one's work carry out the discharge opeing pressure release before formal kill-job according to the time T calculated, after this oil well be have passed through the discharge opeing pressure release of time T (when namely having reached the time started of predetermined kill-job), whether staff is now time started of correct kill-job to determine better, also this oil well is carried out the test of pre-kill-job, then staff judges to be whether now correct kill-job time started according to the result of pre-kill-job. application technical scheme, staff can to the work needing the oil well carrying out kill-job to accurately determine the kill-job time started, the kill-job time started between for different oil wells is made really to establish a capital and can carry out science judgment according to the calculated results, and be no longer to surmise the time that kill-job starts only according to experience, therefore, the defining method of kill-job time started provided by the invention has the scope of application widely, improves staff and oil well carries out the success rate of kill-job.
In step sl, the formula of the time T calculating a discharge opeing pressure release is: T=a ��+b, wherein, a=1.9133, b=30.051,
Before SAGD oil well is carried out kill-job, it is necessary to oil well is carried out discharge opeing pressure release effectively, to reduce downhole temperature and the pressure of oil well, so provide favourable condition for effective kill-job. In order to accurately determine the kill-job time started, staff summarizes the calculating of the time started that oil well carries out kill-job from the result of substantial amounts of experiment measuring, thus summarizes the relevant computing formula T=a ��+b calculating the kill-job time, wherein, a=1.9133, b=30.051
Wherein, in step sl, vapour cavity volume V is calculated by the cumulative oil production of oil well.
In conjunction with referring to as shown in Figure 3 and Figure 4, in the recovery process of SAGD oil well, staff constantly injects, to the upper horizontal well 10 (can also be called steam injection well) of oil well, the steam that exploitation is required, thus defining vapor chamber, while continually entering steam, the super-viscous oil in oil well being exploited, the crude oil that exploitation obtains is drained earth's surface from lower horizontal well 20 (can also be called producing well). Therefore, the volume that the cumulative oil production of oil well is obtained with the ratio of the density of this super-viscous oil, it is vapour cavity volume V. At computing formula T=a ��+b, wherein, a=1.9133, b=30.051,In, the data value of vapour cavity pressure P and oil reservoir degree of depth h is all the valid data that staff measures in the process that oil well carries out effectively exploration.
In order to more accurately determine the correctness of above computing formula, 15 oil wells have been carried out the collection in data by staff, and these 15 oil wells are carried out cumulative oil production, vapour cavity pressure, vertical depth and actual venting duration respectively made data statistic, shown in table specific as follows.
Cumulative oil production, vapour cavity pressure, vertical depth and actual venting duration data statistic
| Sequence number | Accumulative oil mass/ton | Vapour cavity pressure/MPa | Vertical depth/m | (v*p)/h | Venting duration/hour |
| 1 | 2930 | 3.3 | 180 | 53.71667 | 130 |
| 2 | 3326 | 3 | 185 | 53.93514 | 125 |
| 3 | 4892 | 3.5 | 250 | 68.488 | 144 |
| 4 | 6517 | 3.7 | 250 | 96.4516 | 238 |
| 5 | 6812 | 4 | 250 | 108.992 | 240 |
| 6 | 7218 | 3.8 | 250 | 109.7136 | 240 |
| 7 | 8346 | 3.6 | 220 | 136.5709 | 260 |
| 8 | 9133 | 3.3 | 235 | 128.2506 | 255 |
| 9 | 12510 | 3 | 200 | 187.65 | 365 |
| 10 | 13713 | 3.6 | 250 | 197.4672 | 388 |
| 11 | 15664 | 3.7 | 250 | 231.8272 | 456 |
| 12 | 17221 | 3.5 | 250 | 241.094 | 460 |
| 13 | 18215 | 3.4 | 240 | 258.0458 | 538 |
| 14 | 19574 | 3.1 | 200 | 303.397 | 600 |
| 15 | 18836 | 3.4 | 200 | 320.212 | 621 |
In conjunction with referring to as shown in Figure 5, Fig. 5 is " cumulative oil production, vapour cavity pressure, vertical depth and actual venting duration data statistic " expression in linear coordinate diagram, so, staff is according to this linear coordinate figure, it is possible to correctly draw the computing formula T=a ��+b of the time T calculating a discharge opeing pressure release.
After the examination of precompressed well surveying terminates, staff to judge the kill-job time started according to the result of precompressed well surveying examination, wherein, result according to the examination of precompressed well surveying judges the kill-job time started: result 1: the well head of oil well does not have excessive fluid, then judge that any time in the stipulated time range lambda after the examination of precompressed well surveying is as the kill-job time started, wherein, 0�ܦˡ�60min; As a result 2: the well head of oil well has excessive fluid, then oil well carries out secondary discharge opeing pressure release, and the time of secondary discharge opeing pressure release is t, then repeat step S3, until the kill-job time started is determined.
After result according to pre-kill-job has judged the kill-job time started, within the regular hour, oil well must be carried out effective kill-job operation, otherwise As time goes on the temperature in oil well and pressure can have greatly changed, thus it is unfavorable for the carrying out that kill-job operates, causes that staff misses the preferably kill-job time. Therefore, after staff judges pre-kill-job success, staff just should start kill-job operation any time in stipulated time range lambda (0�ܦˡ�60min), to ensure the success rate of kill-job. If after pre-kill-job terminates, still excessive fluid is had to flow out at the well head place of oil well, then illustrate that the down-hole pressure of oil well is higher than the down-hole pressure carried out required by kill-job, and, staff is also necessary to measure the temperature of this excessive fluid, if the temperature of excessive fluid is more than 100 degrees Celsius, then downhole temperature now has exceeded the downhole temperature required by kill-job, this just requires that staff needs oil well is proceeded the work of discharge opeing pressure release. Therefore, after the result judgement generation result 2 that staff tries according to precompressed well surveying, staff needs oil well is carried out secondary discharge opeing pressure release, and oil well again carries out precompressed well surveying examination after secondary discharge opeing pressure release, until the kill-job time started is determined.
Further, time t calculates according to �� (t+T)=�� T, and wherein, �� is actual discharge opeing flow velocity, and �� is normal drainage flow velocity (2.5��3.0m3/ h). Staff is in the process carrying out a discharge opeing pressure release, usually, staff by the normal discharge opeing flow speed control suitable scope of steam injection flow velocity when with exploitation oil reservoir, i.e. normal drainage flow velocity 2.5m3/h�ܦ̡�3.0m3/ h, in the work process of actual discharge opeing pressure release, staff needs the exploitation situation according to different oil wells that the discharge opeing flow velocity of discharge opeing pressure release is done suitable adjustment.
According to another aspect of the present invention, present invention also offers a kind of well killing method. This well killing method comprises the following steps:
Step S10: when carrying out discharge opeing pressure release with normal drainage flow velocity, carries out the discharge opeing pressure release of time T to oil well, and wherein, time T is the time T of a discharge opeing pressure release of claim 1 or 2;
Step S20: determine the kill-job time started;
Step S30: start kill-job within the scope of the stipulated time after the kill-job time started, wherein, it is stipulated that time range is ��, 0�ܦˡ�60min.
Well killing method provided by the present invention can accurately calculate wanted elapsed time T theoretical value oil well carrying out discharge opeing pressure release to reduce oil well temperature and pressure according to the defining method of the kill-job time started of aforementioned offer, and through the test operation of feasible pre-kill-job, the kill-job time started of oil well is judged exactly, then staff starts kill-job again, the operation of well workover, so can put forward the success rate of high-pressure well operations largely, avoid kill-job time that staff determines by empirical method and kill-job time started problem too late too early or the kill-job time occurs, thus putting forward the success rate of high-pressure well operations.
Preferably, in step s 30, utilizing the hot sewage of removing oil to carry out kill-job as well killing fluid, wherein, the temperature of the hot sewage of removing oil is in default temperature range. Wherein, the temperature of the hot sewage of removing oil is Q, 60 DEG C��Q��70 DEG C. This has the sewage after can effectively utilizing removing oil, saving water resource. It also is able to effectively recycle resource in oil field simultaneously.
Further, after well killing fluid returns producing well well head, closing the shaft collar of oil well, shaft collar opened by the stewing well through the scheduled time after standing, and the overflow result according to well mouth of oil well judges that whether kill-job is successful. Wherein, fix time as �� T, �� T >=30min.
After judging kill-job success, and before carrying out follow-up workover treatment, adopt the hydrogen sulfide in alkali liquor and in oil well. This can reduce the hydrogen sulfide injury to staff, the safety of the life and health of protection staff.
In and hydrogen sulfide after, and before carrying out follow-up workover treatment, adopt cooling water pressure well to cool down tubing string in well. After kill-job completes, staff carries tubing string and carries out the work of follow-up oil pumping, with cooling water composite cooling pipe post, it is prevented that staff is scalded by the tubing string of heat when carrying tubing string.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
Application technical scheme, staff can to the work needing the oil well carrying out kill-job to accurately determine the kill-job time started, the kill-job time started between for different oil wells is made really to establish a capital and can carry out science judgment according to the calculated results, and be no longer to surmise the time that kill-job starts only according to experience, therefore, the defining method of kill-job time started provided by the invention has the scope of application widely, improves staff and oil well carries out the success rate of kill-job.
Application technical scheme, staff can to the work needing the oil well carrying out kill-job to accurately determine the kill-job time started, the kill-job time started between for different oil wells is made really to establish a capital and can carry out science judgment according to the calculated results, and be no longer to surmise the time that kill-job starts only according to experience, therefore, the defining method of kill-job time started provided by the invention has the scope of application widely, improves staff and oil well carries out the success rate of kill-job.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (12)
1. the defining method of a kill-job time started, it is characterised in that: comprise the following steps:
Step S1: obtain well data, described well data includes vapour cavity volume V, vapour cavity pressure P and oil reservoir degree of depth h, and calculates the time T of a discharge opeing pressure release according to described well data;
Step S2: oil well carries out a discharge opeing pressure release, and the time of a described discharge opeing pressure release is T;
Step S3: described oil well is carried out precompressed well surveying examination, and the result according to the examination of precompressed well surveying judges the kill-job time started.
2. the defining method of kill-job time started according to claim 1, it is characterised in that:
In step sl, the formula of the time T calculating a described discharge opeing pressure release is: T=a ��+b, wherein, a=1.9133, b=30.051,
3. the defining method of kill-job time started according to claim 1, it is characterised in that:
In described step S1, described vapour cavity volume V is calculated by the cumulative oil production of described oil well.
4. the defining method of kill-job time started according to claim 1, it is characterised in that: judge that the kill-job time started includes according to the result of precompressed well surveying examination:
As a result 1: the well head of described oil well does not have excessive fluid, then judge that any time in the stipulated time range lambda after the examination of precompressed well surveying is as the kill-job time started, wherein, 0�ܦˡ�60min;
As a result 2: the well head of described oil well has excessive fluid, then described oil well carries out secondary discharge opeing pressure release, and the time of described secondary discharge opeing pressure release is t, then repeating said steps S3, until the described kill-job time started is determined.
5. the defining method of kill-job time started according to claim 4, it is characterised in that:
Described time t calculates according to �� (t+T)=�� T, and wherein, �� is actual discharge opeing flow velocity, and �� is normal drainage flow velocity.
6. a well killing method, it is characterised in that: comprise the following steps:
Step S10: when carrying out discharge opeing pressure release with normal drainage flow velocity ��, carries out the discharge opeing pressure release of time T to oil well, and wherein, described time T is the time T of a discharge opeing pressure release described in claim 1 or 2;
Step S20: determine the kill-job time started;
Step S30: starting kill-job within the scope of the stipulated time after the described kill-job time started, wherein, the described stipulated time ranges for ��, 0�ܦˡ�60min.
7. well killing method according to claim 6, it is characterised in that:
In described step S30, utilizing the hot sewage of removing oil to carry out kill-job as well killing fluid, wherein, the temperature of the hot sewage of described removing oil is in default temperature range.
8. well killing method according to claim 7, it is characterised in that:
The temperature of the hot sewage of described removing oil is Q, 60 DEG C��Q��70 DEG C.
9. the well killing method according to any one of claim 6 to 7, it is characterised in that:
After described well killing fluid returns producing well well head, closing the shaft collar of oil well, described shaft collar opened by the stewing well through the scheduled time after standing, and the overflow result according to described well mouth of oil well judges that whether kill-job is successful.
10. well killing method according to claim 9, it is characterised in that:
The described scheduled time is �� T, �� T >=30min.
11. well killing method according to claim 8, it is characterised in that:
After judging kill-job success, and before carrying out follow-up workover treatment, adopt the hydrogen sulfide in alkali liquor and in described oil well.
12. well killing method according to claim 11, it is characterised in that:
In and described hydrogen sulfide after, and before carrying out follow-up workover treatment, adopt cooling water pressure well to cool down tubing string in well.
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