CN104481527A - Horizontal well underground sectional sampling control method - Google Patents
Horizontal well underground sectional sampling control method Download PDFInfo
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- CN104481527A CN104481527A CN201410736311.4A CN201410736311A CN104481527A CN 104481527 A CN104481527 A CN 104481527A CN 201410736311 A CN201410736311 A CN 201410736311A CN 104481527 A CN104481527 A CN 104481527A
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- sampling
- sampler
- test
- test zone
- horizontal well
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- 238000005070 sampling Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 98
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 230000011218 segmentation Effects 0.000 claims description 17
- 239000011229 interlayer Substances 0.000 claims description 8
- 230000003203 everyday effect Effects 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 11
- 238000007789 sealing Methods 0.000 description 6
- 239000003129 oil well Substances 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003556 assay Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention particularly provides a horizontal well underground sectional sampling control method, which comprises the following steps: 1) calculating the drainage period of the fluid in the shaft and determining the sampling time; 2) determining a sampling mode; 3) a downhole sampling test pipe column is put into the test interval; 4) completing underground sampling through the sampler according to the sampling mode determined in the step 2); 5) after the sampling of the sampler is finished, the testing pipe column is lifted out, and the fluid of each sampler is collected; 6) and (6) analyzing the sample. The underground sampler is brought into a target layer by using the oil pipe, the packer seals a test layer section, and the multi-section sampling is completed by one time of pipe column, so that compared with the ground sampling, the underground sampler has the advantages of strong sample representativeness, low test cost and high test efficiency; in addition, the method can be applied to taking out the actual fluid of the stratum when the water outlet position of the horizontal well with high and medium water content can not be judged, finding out the water outlet layer section through ground test analysis, and further adopting the measures of water control and oil stabilization.
Description
Technical field
The invention belongs to oil extraction in oil field development technique field, be specifically related to sectional sampling control method under a kind of Horizontal Well, be mainly used in horizontal well water exploration and formation fluid property analysis etc.
Background technology
Along with horizontal well development scale constantly expands, face in raising oil recovery rate simultaneously and see water problem with development time prolongation oil well, after water breakthrough, oil well productivity declines rapidly, needs badly and carries out water detection measure, could implement water blockoff targetedly.
Traditional horizontal well machinery water detection technology adopts packer sealing test zone, by derailing switch production control, finds water exit position.
To give up searching pipe column as Chinese patent CN202788638U discloses a kind of cased hole completion multistage pressure break horizontal well multistage subsection, comprise: multistage searching pipe column assembly, be located in the horizontal segment sleeve pipe of horizontal well, comprise the plug set gradually from the bottom to top, spaced multiple Y441 type packer, back-off sub, the sealing area between two adjacent Y441 type packers forms a linkage section; Safety joint and derailing switch is connected with in turn in each linkage section; Flow string assembly comprises oil well pump, oil pump plunger piston, sucker rod, and oil well pump top connected pipes is to horizontal well well head place, and oil pump plunger piston connecting with pumping rod, the upper end of sucker rod is connected with described ground oil pumper.This invention achieves the water detection test that one-trip string completes each interval of horizontal well, water detection testing efficiency is high, and test zone is unrestricted, can meet the segmentation water detection function of water under high pressure horizontal well, avoid flow string to wriggle, improve accuracy and the tubing string sealing reliability of water detection test.
And for example Chinese patent CN202596684U discloses a kind of casing tube well-completion horizontal well multistage subsection and asks product, water detection test technology tubing string, it includes the multistage intelligent derailing switch set gradually, a safety joint and a packer is being provided with successively respectively by oil pipe between intelligent switch device described in each adjacent two, wherein, described packer is Y341 or Y441 type packer; Wherein, on the free end of intelligent switch device described in the first order, be connected with a taper plug by oil pipe.This pressure-bearing difference intensity kept a grip on is high, and functional reliability is good, and product, water detection test jobs are asked in the integrated segmentation being adapted to many pay intervals horizontal well.
But the method in above-mentioned patent all must be discharged after pit shaft and can sample until formation fluid, and for the horizontal well that transformation hop count is more, measure period is long.
In addition, downhole sampler major part conventional is at present by entering sampler under cable or steel wire, and mainly adopt the closed forms such as clock, wall built-up and hammering, this type of sampler enters well control method and mainly has the following disadvantages:
(1) horizontal well in segments cannot be carried out and control sampling;
(2) sampling control method is complicated, long construction period, and testing cost is higher;
(3) during sampling and testing, oil well is not normally produced, and sampling accuracy is lower.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, sectional sampling control method under a kind of Horizontal Well is provided, realizes the quick water detection technique of down-hole sectional sampling when horizontal well is normally produced, and then chemically examined by ground moisture, find water exit position.
For this reason, the invention provides sectional sampling control method under a kind of Horizontal Well, comprise the steps:
1) calculate the wellbore fluids discharge opeing phase, determine sample time; Wellbore fluids discharge opeing phase=horizontal well length × horizontal well pit shaft sectional area/pit shaft lifting rate every day;
2) sampling mode is determined, if each test zone spacing is less than 100m or each test interlayer pressure difference is greater than 2MPa, then adopt segmentation sampling mode successively, otherwise, if each test zone spacing is more than or equal to 100m or each test interlayer pressure difference is less than or equal to 2MPa, then adopt segmentation sampling mode simultaneously;
3) to sampling and testing tubing string under lower going-into-well in test zone; Enter test zone by oil pipe by under downhole sampler, packer serial connection, and by packer, test zone card is opened, under each test zone, enter multiple downhole sampler;
4) according to step 2) in the sampling mode determined, complete well sampling by sampler;
5) after sampler completes sampling in all test zones, trip out test string, collect the fluid of each sampler;
6) sample analysis; Its moisture content of chemical examination passed through to the fluid of each sampler collected and analyzes water type, finding water exit position.
Above-mentioned segmentation successively sampling mode is only sample a test zone every day, and the sampler of this test zone divides and do not sample successively in the same time.
Above-mentioned segmentation simultaneously sampling mode is sample in the same time the jack per line sampler of each test zone for one day, within one day, completes the sampling of all test zones.
Above-mentioned steps 3) in each test zone under enter sampler number be 3.
Above-mentioned steps 4) carry out well sampling before by drained for the fluid be stored in pit shaft.
Beneficial effect of the present invention: sectional sampling control method under this Horizontal Well provided by the invention, utilizes oil pipe to bring downhole sampler into target zone, packer sealing test zone, one-trip string completes multistage sampling; Compared with ground sample, the sample representativeness that the present invention obtains is strong, testing cost is low, testing efficiency is high; In addition, the present invention can be applicable to middle High water cut horizontal well when cannot judge water exit position, is taken out by stratum real fluid, by ground assay, finds water exit interval, and then take water and oil control measure.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is sectional sampling control method flow chart under Horizontal Well of the present invention.
Fig. 2 is segmentation sampling mode schematic diagram successively under Horizontal Well in the present invention.
Fig. 3 is segmentation simultaneously sampling mode schematic diagram under Horizontal Well in the present invention.
Detailed description of the invention
Embodiment 1:
In order to overcome the deficiencies in the prior art, realizing the quick water detection of down-hole sectional sampling when horizontal well is normally produced, present embodiments providing sectional sampling control method under a kind of Horizontal Well as shown in Figure 1, Figure 2 and Figure 3, comprising the steps:
1) calculate the wellbore fluids discharge opeing phase, determine sample time; Wellbore fluids discharge opeing phase=horizontal well length × horizontal well pit shaft sectional area/pit shaft lifting rate every day;
2) sampling mode is determined, if each test zone spacing is less than 100m or each test interlayer pressure difference is greater than 2MPa, then adopt segmentation sampling mode successively, otherwise, if each test zone spacing is more than or equal to 100m or each test interlayer pressure difference is less than or equal to 2MPa, then adopt segmentation sampling mode simultaneously;
3) to sampling and testing tubing string under lower going-into-well in test zone; Enter test zone by oil pipe by under downhole sampler, packer serial connection, and by packer, test zone card is opened, under each test zone, enter multiple downhole sampler;
4) according to step 2) in the sampling mode determined, complete well sampling by sampler;
5) after sampler completes sampling in all test zones, trip out test string, collect the fluid of each sampler;
6) sample analysis; Its moisture content of chemical examination passed through to the fluid of each sampler collected and analyzes water type, finding water exit position.
This invention utilizes oil pipe to bring downhole sampler into target zone, packer sealing test zone, and one-trip string completes multistage sampling, and sample representativeness is strong compared with ground sample, testing cost is low, testing efficiency is high; In addition, the present invention can be applicable to middle High water cut horizontal well when cannot judge water exit position, is taken out by stratum real fluid, by ground assay, finds water exit interval, and then take water and oil control measure.
Embodiment 2:
On the basis of embodiment 1, for guarantee sampling accurately, downhole sampler is reliable, described step 3) in each test zone under enter sampler number be 3, take sky as chronomere on ground, set the time that each downhole sampler opens and closes.
And described segmentation successively sampling mode be only a test zone is sampled every day, and the sampler of this test zone divides and does not sample successively in the same time; Described segmentation simultaneously sampling mode is sample in the same time the jack per line sampler of each test zone for one day, within one day, completes the sampling of all test zones.
Enter 3 samplers under in each test zone, be numbered 1. number sampler, 2. number sampler and 3. number sampler; As shown in Figure 2, be less than for test zone spacing the well that 100m or interlayer pressure difference be greater than 2MPa, first to the sampling of first floor test zone, during the 1. number sampler sampling of first floor test zone, other sampler is all in closed condition; In 3 samplers 1 day of each test zone, point 3 moment samplings, after first floor test zone completes sampling, are daily sampled to n-th layer test zone successively by first floor test zone.
As shown in Figure 3, be more than or equal to for test zone spacing the well that 100m or interlayer pressure difference be less than or equal to 2MPa, an each test zone 1. number sampler samples simultaneously, and all the other samplers are all in closed condition; After 1. a number sampler completes, an each interval 2. number sampler samples simultaneously again; After 2. a number sampler completes, an each interval 3. number sampler samples simultaneously again, completes the sampling of all test zones in 1 day.
In addition, in order to ensure sampling accurately, can also in described step 4) carry out well sampling before by drained for the fluids such as the flushing fluid that is stored in pit shaft.
Embodiment 3:
The present embodiment is clearly and completely described down-hole sectional sampling control method in the present invention for Changqing oilfields water horizontal well.
Embodiment well is a bite pressure break horizontal well, fracturing reform 7 sections, is divided into 5 sections carries out down-hole sectional sampling water detection by analysis flooding pattern and current mining.
Step 1): determine sample time; The dark 3090m of this hole deviation, horizontal section length 800m, casing inner diameter 124.26mm, this well lifting rate every day is 4.5m
3, be 8 days by calculating the pit shaft discharge opeing phase.
Step 2): determine sampling mode; Enter three downhole samplers under each test zone, because each test zone spacing of this well is comparatively large, average distance more than 100m, therefore adopts segmentation sampling mode simultaneously, and the downhole sampler of each test zone opens and closes set of time and is:
(1) the 9th day 0 point, an each test zone 1. number sampler starts sampling, and 0:30 sampler cuts out, and completes each section of first time sampling;
(2) the 9th days 8 points, an each test zone 2. number sampler starts sampling, and 8:30 sampler cuts out, and completes each section of second time sampling;
(3) the 9th days 16 points, an each test zone 3. number sampler starts sampling, and 16:30 sampler cuts out, and completes each section of third time sampling.
Step 3): sampling and testing tubing string under lower going-into-well in test zone; By oil pipe, the tool string such as downhole sampler, packer is connected down test zone, test zone sealed clamping cleat is opened by packer at different levels, enters three downhole samplers under each test zone.
Step 4): completion is opened and is taken out; Opening well and making production on request, discharge opeing 8 days, by drained for the fluids such as the flushing fluid that is stored in pit shaft.
Step 5): sample by the sampling mode determined; 9th day by step 2) programming samples.
Step 6): trip out test string; Within 10th day, trip out test string, the fluid of surface collection downhole sampler at different levels.
Step 7): sample analysis is chemically examined; Analyze water type by sample for test moisture content, find specking 1 ~ specking 4 for water exit position.
In sum, sectional sampling control method under this Horizontal Well provided by the invention, utilizes oil pipe to bring downhole sampler into target zone, packer sealing test zone, and one-trip string completes multistage sampling; Compared with ground sample, the sample representativeness that the present invention obtains is strong, testing cost is low, testing efficiency is high.
More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (5)
1. a sectional sampling control method under Horizontal Well, is characterized in that: comprise the steps:
1) calculate the wellbore fluids discharge opeing phase, determine sample time; Wellbore fluids discharge opeing phase=horizontal well length × horizontal well pit shaft sectional area/pit shaft lifting rate every day;
2) sampling mode is determined, if each test zone spacing is less than 100m or each test interlayer pressure difference is greater than 2MPa, then adopt segmentation sampling mode successively, otherwise, if each test zone spacing is more than or equal to 100m or each test interlayer pressure difference is less than or equal to 2MPa, then adopt segmentation sampling mode simultaneously;
3) to sampling and testing tubing string under lower going-into-well in test zone; Enter test zone by oil pipe by under downhole sampler, packer serial connection, and by packer, test zone card is opened, under each test zone, enter multiple downhole sampler;
4) according to step 2) in the sampling mode determined, complete well sampling by sampler;
5) after sampler completes sampling in all test zones, trip out test string, collect the fluid of each sampler;
6) sample analysis; Its moisture content of chemical examination passed through to the fluid of each sampler collected and analyzes water type, finding water exit position.
2. sectional sampling control method under Horizontal Well as claimed in claim 1, is characterized in that: described segmentation successively sampling mode is only sample a test zone every day, and the sampler of this test zone divides and do not sample successively in the same time.
3. sectional sampling control method under Horizontal Well as claimed in claim 1, is characterized in that: described segmentation simultaneously sampling mode is sample in the same time the jack per line sampler of each test zone for one day, within one day, completes the sampling of all test zones.
4. sectional sampling control method under Horizontal Well as claimed in claim 1, is characterized in that: described step 3) in each test zone under enter sampler number be 3.
5. sectional sampling control method under Horizontal Well as claimed in claim 1, is characterized in that: described step 4) carry out well sampling before by drained for the fluid be stored in pit shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410736311.4A CN104481527B (en) | 2014-12-05 | 2014-12-05 | Horizontal well underground sectional sampling control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410736311.4A CN104481527B (en) | 2014-12-05 | 2014-12-05 | Horizontal well underground sectional sampling control method |
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| CN104481527A true CN104481527A (en) | 2015-04-01 |
| CN104481527B CN104481527B (en) | 2017-11-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107304667A (en) * | 2016-04-21 | 2017-10-31 | 中国石油天然气股份有限公司 | Well completion pipe string |
| CN116733454A (en) * | 2023-08-01 | 2023-09-12 | 西南石油大学 | Intelligent water finding method for horizontal well |
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2014
- 2014-12-05 CN CN201410736311.4A patent/CN104481527B/en active Active
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Non-Patent Citations (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107304667A (en) * | 2016-04-21 | 2017-10-31 | 中国石油天然气股份有限公司 | Well completion pipe string |
| CN116733454A (en) * | 2023-08-01 | 2023-09-12 | 西南石油大学 | Intelligent water finding method for horizontal well |
| CN116733454B (en) * | 2023-08-01 | 2024-01-02 | 西南石油大学 | Intelligent water finding method for horizontal well |
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| CN104481527B (en) | 2017-11-07 |
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