CN108798659A - A kind of low permeability tight gas reservoir exploration reasonable test method of gas testing well - Google Patents
A kind of low permeability tight gas reservoir exploration reasonable test method of gas testing well Download PDFInfo
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- 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
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- 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
- E21B47/00—Survey of boreholes or wells
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- 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
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Abstract
The present invention discloses a kind of low permeability tight gas reservoir exploration reasonable test method of gas testing well, includes the following steps：It collects and arrange low permeability tight gas reservoir exploration gas testing target well is drilled the data such as well, well logging, coring, and comprehensive analysis is carried out to data, obtain the basic parameter of gas reservoir and gas well；Exploration gas testing test jobs are carried out using the 3 positive sequence test patterns for opening 3 passes to target well, and obtain the gas well mouth aerogenesis flow in 3 operations that drive a well；After the gas testing test jobs that 3 open 3 passes, the electronic pressure gauge of taking-up is read out using well test analysis software, 3 pass duty history curve graphs are opened in draw gas well gas testing 3, are closed to 2 and 3 close test data progress well test analysis, export explanation results.This method can ensure that the successful test of hypotonic tight gas reservoir, promotes well testing test curve quality, precisely determines original formation pressure and formation characteristics parameter, evaluates prospect pit gas deliverability, see clearly stratum filtration ability.
Description
Technical field
The invention belongs to oil-gas mining technical fields, and in particular to a kind of low permeability tight gas reservoir exploration gas testing well is rationally surveyed
Method for testing.
Background technology
Low permeability gas reservoir is widely distributed in the world, and stock number is big, all takes much count of the exploitation to such gas field both at home and abroad at present.
Low permeability gas reservoir reservoir is fine and close, reserves abundance is low, anisotropism is strong, realizes that Efficient Development difficulty is big.To exploration gas testing initial stage
Low permeability gas reservoir, in the case where development data is still not perfect, the working system that gas testing test is explored to it is studied, and can be
The exploration of gas reservoir is found and rationally Efficient Development provides technical support.
Because conventional middle and high infiltration gas reservoir physical property is good, reserves abundance is high, strata pressure recovery time is short, and gas reservoir exploration gas testing is surveyed
It tries to open the gas testing working system design in short-term of 2 passes frequently with conventional 2.To hypotonic tight gas reservoir, gas well is caused to try because of physical property difference
Reservoir supply capacity is insufficient when gas, opens 2 passes gas testing working system in short-term according to conventional 2, then can not carry out effective well testing
It explains.By taking the low permeability gas reservoirs gas testing well of Jilin Oil Field exploratory area as an example, which opens 2 passes gas testing working system in short-term using conventional 2
It is tested (see Fig. 1).The open-shut in time of the well test is shorter, and one opens only 0.581h, and two open only 0.674h, and closed-in time
Much larger than well opening time, the pressure drop funnel of effect is not formed in shut-in pressure before restoring, and well-test curve is caused pressure derivative song occur
Line turns over the abnormal conditions (see Fig. 2) above pressure curve, can not carry out effective well test analysis.Therefore, conventional 22 passes are opened
Gas testing working system design method is no longer desirable for hypotonic tight gas reservoir in short-term.Currently, there is no scientific and reasonable hypotonic tight gas
The test design method for hiding exploration gas testing carries out the reasonable Study on Test Method of gas well exploration gas testing for hypotonic tight gas reservoir,
Undoubtedly have great importance.
Invention content
The present invention mainly overcomes shortcoming in the prior art, proposes that a kind of low permeability tight gas reservoir exploration gas testing is closed
Test method is managed, this method can ensure that the successful test of hypotonic tight gas reservoir, promote well testing test curve quality, precisely determine former
Beginning strata pressure and formation characteristics parameter evaluate prospect pit gas deliverability, see clearly stratum filtration ability.
The present invention solves the technical solution that above-mentioned technical problem is provided：A kind of low permeability tight gas reservoir exploration gas testing well
Reasonable test method, includes the following steps：
Step S10, it collection and arranges low permeability tight gas reservoir exploration gas testing target well and is drilled the moneys such as well, well logging, coring
Material, and comprehensive analysis is carried out to data, obtain the basic parameter of gas reservoir and gas well；
Step S20, electronic pressure gauge is placed in target well shaft bottom；
Step S30, exploration gas testing test jobs are carried out using the 3 positive sequence test patterns for opening 3 passes to target well, and obtains 3
Gas well mouth aerogenesis flow in the secondary operation that drives a well；Wherein each closed-in time is more than well opening time, in order to make the 1st time
Closed-in bottom-hole pressure can be restored to original formation pressure, and enable the 2nd time and the 3rd closing well reaches radial flow；
Step S40, after the gas testing test jobs that 3 open 3 passes, using well test analysis software by the electron pressure of taking-up
Meter is read out, and 3 pass duty history curve graphs are opened in draw gas well gas testing 3, is closed to 2 and 3 close test data progress well test analysis,
Export explanation results.
Further embodiment is, in the step S30 the specific steps are：
Step S301, first throttle gas nozzle d is placed in gas well mouth again1, by the 1st well opening time t1The 1st time is carried out to drive a well
Operation obtains first time gas well mouth aerogenesis flow q1；
Step S302, the 1st closed-in time t is pressed1sThe 1st closing well operation is carried out, the second throttling is changed at the end of closing well
Gas nozzle d2；
Step S303, the 2nd well opening time t is pressed2The 2nd operation that drives a well is carried out, second of gas well mouth aerogenesis stream is obtained
Measure q2；
Step S304, the 2nd closed-in time t is pressed2sThe 2nd closing well operation is carried out, third throttling is changed at the end of closing well
Gas nozzle d3；
Step S305, the 3rd well opening time t is pressed3The 3rd operation that drives a well is carried out, third time gas well mouth aerogenesis stream is obtained
Measure q3；
Step S306, the 3rd closed-in time t is pressed3sThe 3rd closing well operation is carried out, electronic pressure gauge is taken out after closing well.
Further embodiment is the first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3's
Diameter is sequentially increased, to obtain the increased gas well gas testing yield that drives a well step by step.
Further embodiment is the first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3's
Diameter is determined by the permeability k of target well；
As permeability k<When 0.001mD, first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter
3mm, 5mm, 7mm are taken respectively；When permeability 0.001<k<When 0.01mD, first throttle gas nozzle d1, the second throttling gas nozzle d2, third
Throttle gas nozzle d3Diameter take 4mm, 6mm, 8mm respectively；When permeability 0.01<k<When 0.1mD, first throttle gas nozzle d1, second section
Gas mouth d2, third throttling gas nozzle d3Diameter take 5mm, 7mm, 9mm respectively；When permeability 0.1<k<When 1mD, first segment gas
Mouth d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter take 6mm, 8mm, 10mm respectively；As permeability k>When 1mD, the
One throttling gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter take 7mm, 9mm, 11mm respectively.
Further embodiment is the 1st in the step S30 time well opening time t1, the 2nd well opening time t2, the 3rd
Secondary well opening time t3, the 1st closed-in time t1s, the 2nd closed-in time t2s, the 3rd closed-in time t3sIn want time closed-in time big
In well opening time, and well opening time is determined by the following conditions：
As permeability k<When 0.001mD, the 1st well opening time t1, the 2nd well opening time t2, the 3rd well opening time t3It answers
Between 200-300h；When permeability 0.001<k<When 0.01mD, the 1st well opening time t1, the 2nd well opening time t2, the 3rd time
Well opening time t3It should be between 100-200h；When permeability 0.01<k<When 0.1mD, the 1st well opening time t1, when driving a well the 2nd time
Between t2, the 3rd well opening time t3It should be between 50-100h；When permeability 0.1<k<When 1mD, the 1st well opening time t1, the 2nd time
Well opening time t2, the 3rd well opening time t3It should be between 20-50h；As permeability k>When 1mD, the 1st well opening time t1, the 2nd time
Well opening time t2, the 3rd well opening time t3It should be between 10-20h.
The beneficial effects of the invention are as follows：The present invention considers the hypotonic characteristic of low permeability tight gas reservoir, devises and is suitble to it
The reasonable exploration gas testing test method of stratum actual conditions；The invention can ensure that the successful test of hypotonic tight gas reservoir, promote examination
Well test curve quality precisely determines original formation pressure and formation characteristics parameter, evaluates prospect pit gas deliverability, sees clearly that stratum is oozed
Stream ability provides reference for gas well fracturing measure decision and gas well rational proration etc..
Description of the drawings
Fig. 1 is Jilin Oil Field exploratory area low permeability gas reservoirs gas testing well gas testing duty history curve graph；
Fig. 2 is that low permeability gas reservoirs gas testing Jing2Guan in Jilin Oil Field exploratory area presses extensive well testing fitted figure；
Fig. 3 is that the low permeability gas reservoirs three for implementing to generate after work step of the present invention open three pass duty history curve graphs；
Fig. 4 be big ox low permeability tight gas reservoir X gas testings well three open three pass test curve figures；
Fig. 5 be big ox low permeability tight gas reservoir X gas testings well two close test curve log-log graph；
Fig. 6 be big ox low permeability tight gas reservoir X gas testings well three close test curve log-log graph.
Specific implementation mode
Further description is done to the present invention with reference to embodiment and attached drawing.
A kind of low permeability tight gas reservoir of the present invention explores the reasonable test method of gas testing well, includes the following steps：
Step S10, it collection and arranges low permeability tight gas reservoir exploration gas testing target well and is drilled the moneys such as well, well logging, coring
Material, and comprehensive analysis is carried out to data, grasp the essential information of gas reservoir and gas well；
Step S20, electronic pressure gauge is placed in target well shaft bottom, then to target well, the positive sequence that 3 passes are opened using 3 tests mould
Formula carries out exploration gas testing working, using the gas nozzle size that drives a well amplified step by step, to obtain the increased gas well examination that drives a well step by step
Gas yield；
Step S30, first throttle gas nozzle d is placed in gas well mouth again1, by the 1st well opening time t1The 1st time is carried out to drive a well
Operation, in order to exclude the leak-off working solution for being drilled well, obtain first time gas well mouth aerogenesis flow q1；
Step S40, the 1st closed-in time t is pressed1sCarry out the 1st closing well operation, in order to accurately obtain prime stratum
Pressure is changed to the second throttling gas nozzle d at the end of closing well2；
Step S50, the 2nd well opening time t is pressed2Carry out the 2nd operation that drives a well, in order in process of production can
Effective pressure drop funnel is formed, the well-test curve of test can be made to reflect the more complete seepage flow characteristics of formation fluid, is obtained
Second of gas well mouth aerogenesis flow q2；
Step S60, the 2nd closed-in time t is pressed2sCarry out the 2nd closing well operation, in order to test using the secondary closing well
Pressure data carry out pressure build-up test explanation be changed to third at the end of closing well to obtain effective formation characteristics parameter
Throttle gas nozzle d3；
Step S70, the 3rd well opening time t is pressed3Carry out the 3rd operation that drives a well, in order to test whether gas well has
Strong yield hoisting power obtains third time gas well mouth aerogenesis flow q3；
Step S80, the 3rd closed-in time t is pressed3sThe 3rd closing well operation is carried out, electronic pressure gauge is taken out after closing well.
Step S90, after the gas testing test jobs that 3 open 3 passes, using well test analysis software by the electron pressure of taking-up
Meter is read out, and 3 pass duty history curve graphs are opened in draw gas well gas testing 3, is closed to 2 and 3 close test data progress well test analysis,
Export explanation results.
The wherein described first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter be to be sequentially increased
, to obtain the increased gas well gas testing yield that drives a well step by step.Purpose is original in order to enable the 1st closed-in bottom-hole pressure to be restored to
Strata pressure, and enable the 2nd time and the 3rd closing well reaches radial flow.
Particularly, the first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter pass through mesh
The permeability k for marking well is determined；
As permeability k<When 0.001mD, first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter
3mm, 5mm, 7mm are taken respectively；When permeability 0.001<k<When 0.01mD, first throttle gas nozzle d1, the second throttling gas nozzle d2, third
Throttle gas nozzle d3Diameter take 4mm, 6mm, 8mm respectively；When permeability 0.01<k<When 0.1mD, first throttle gas nozzle d1, second section
Gas mouth d2, third throttling gas nozzle d3Diameter take 5mm, 7mm, 9mm respectively；When permeability 0.1<k<When 1mD, first segment gas
Mouth d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter take 6mm, 8mm, 10mm respectively；As permeability k>When 1mD, the
One throttling gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter take 7mm, 9mm, 11mm respectively.
The 1st well opening time t in the step S301, the 2nd well opening time t2, the 3rd well opening time t3, close the 1st time
Well time t1s, the 2nd closed-in time t2s, the 3rd closed-in time t3sIn want time closed-in time to be more than well opening time, and when driving a well
Between be determined by the following conditions：
As permeability k<When 0.001mD, the 1st well opening time t1, the 2nd well opening time t2, the 3rd well opening time t3It answers
Between 200-300h；When permeability 0.001<k<When 0.01mD, the 1st well opening time t1, the 2nd well opening time t2, the 3rd time
Well opening time t3It should be between 100-200h；When permeability 0.01<k<When 0.1mD, the 1st well opening time t1, when driving a well the 2nd time
Between t2, the 3rd well opening time t3It should be between 50-100h；When permeability 0.1<k<When 1mD, the 1st well opening time t1, the 2nd time
Well opening time t2, the 3rd well opening time t3It should be between 20-50h；As permeability k>When 1mD, the 1st well opening time t1, the 2nd time
Well opening time t2, the 3rd well opening time t3It should be between 10-20h.
Embodiment
Ordos Basin low permeability tight gas reservoir X gas testing wells, depth 2794.5m, reservoir effective thickness 5m, storage in the well
Layer porosity 10%.It has used provided in the present invention 3 to open 3 pass test methods, gas testing survey has been carried out on March 12nd, 2018
Examination.The test job system of design and the yield of test are as shown in table 1, and the bottom pressure curve of test is as shown in Figure 4.One when opening
Between 1.442h, produced using 5mm gas nozzles, obtain gas production 500m3/ d, one to open the main reason for yield is smaller be the working system
The mainly anti-row near wellbore zone of lower production is drilled well leak-off liquid, and well opening time is short, and the natural gas in remote well area does not have also
Effect flowing.One closes time 24.325h, is more than an ETAD expected time of arrival and departure, in order to which bottom pressure can be restored to prime stratum after closing well
The original formation pressure of pressure, acquisition is 18.18MPa.Two ETAD expected time of arrival and departure 24.104h are produced using 7mm gas nozzles, obtain gas production
8761m3/ d, two ETAD expected time of arrival and departure are longer, can form effective pressure drop funnel in process of production, and the well-test curve of test is made to reflect
Go out the more complete seepage flow characteristics of formation fluid.Two close time 147.44h, are more than two ETAD expected time of arrival and departure, can reach radial flow, can carry out
Extensive well test analysis is pressed, effective formation parameter is obtained.Three ETAD expected time of arrival and departure 35.814h are produced using 9mm gas nozzles, obtain gas production
11813m3Whether/d, test gas well have strong yield hoisting power.Three close time 182.186h, are more than three ETAD expected time of arrival and departure, can reach
Radial flow carries out pressure build-up test explanation using the pressure data that the secondary closing well is tested, well test analysis are closed with comparison 2 as a result,
Improve the reliability that well testing fitting is explained.
Table 1
It is closed to the two of X gas testing well tests, three pass pressure build-up curves have carried out well test analysis, the homogeneous that well test analysis is selected
The compound gas-bearing formation model in twoth area of infinitely great boundary, well test analysis fitted figure is as shown in Figure 4, Figure 5, and explanation results are as shown in table 2.Pass through
The test data analysis of embodiment and effective well test analysis, it was confirmed that reliability and feasibility of the invention has potential
Application and popularization value.
Table 2
The above is not intended to limit the present invention in any form, although the present invention is taken off by above-described embodiment
Show, however, it is not intended to limit the invention, any person skilled in the art, is not departing from technical solution of the present invention range
It is interior, when the technology contents using the disclosure above make a little equivalent embodiments changed or be modified to equivalent variations, as long as being not
Be detached from technical solution of the present invention content, according to the technical essence of the invention to made by above example it is any it is simple modification,
Equivalent variations and modification, in the range of still falling within technical solution of the present invention.
Claims (5)
1. a kind of low permeability tight gas reservoir explores the reasonable test method of gas testing well, which is characterized in that include the following steps：
Step S10, collection and arrange low permeability tight gas reservoir exploration gas testing target well be drilled well, well logging, coring data, and
Comprehensive analysis is carried out to data, obtains the basic parameter of gas reservoir and gas well；
Step S20, electronic pressure gauge is placed in target well shaft bottom；
Step S30, exploration gas testing test jobs are carried out using the 3 positive sequence test patterns for opening 3 passes to target well, and obtains 3 times and opens
Gas well mouth aerogenesis flow in well operations, wherein each closed-in time is more than well opening time；
Step S40, after the gas testing test jobs that 3 open 3 passes, using well test analysis software by the electronic pressure gauge of taking-up into
Row is read, and 3 pass duty history curve graphs are opened in draw gas well gas testing 3, is closed to 2 and 3 pass test datas carry out well test analysis, output
Explanation results.
2. a kind of low permeability tight gas reservoir according to claim 1 explores the reasonable test method of gas testing well, which is characterized in that
In the step S30 the specific steps are：
Step S301, first throttle gas nozzle d is placed in gas well mouth again1, by the 1st well opening time t1Carry out the 1st work that drives a well
Industry obtains first time gas well mouth aerogenesis flow q1；
Step S302, the 1st closed-in time t is pressed1sThe 1st closing well operation is carried out, the second throttling gas nozzle is changed at the end of closing well
d2；
Step S303, the 2nd well opening time t is pressed2The 2nd operation that drives a well is carried out, second of gas well mouth aerogenesis flow q is obtained2；
Step S304, the 2nd closed-in time t is pressed2sThe 2nd closing well operation is carried out, third throttling gas nozzle is changed at the end of closing well
d3；
Step S305, the 3rd well opening time t is pressed3The 3rd operation that drives a well is carried out, third time gas well mouth aerogenesis flow q is obtained3；
Step S306, the 3rd closed-in time t is pressed3sThe 3rd closing well operation is carried out, electronic pressure gauge is taken out after closing well.
3. a kind of low permeability tight gas reservoir according to claim 2 explores the reasonable test method of gas testing well, which is characterized in that
The first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter be sequentially increased, with obtain step by step
The increased gas well gas testing yield that drives a well.
4. a kind of low permeability tight gas reservoir according to claim 3 explores the reasonable test method of gas testing well, which is characterized in that
The first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter pass through the permeability k of target well and determine；
As permeability k<When 0.001mD, first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter difference
Take 3mm, 5mm, 7mm；
When permeability 0.001<k<When 0.01mD, first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3It is straight
Diameter takes 4mm, 6mm, 8mm respectively；
When permeability 0.01<k<When 0.1mD, first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter
5mm, 7mm, 9mm are taken respectively；
When permeability 0.1<k<When 1mD, first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter difference
Take 6mm, 8mm, 10mm；
As permeability k>When 1mD, first throttle gas nozzle d1, the second throttling gas nozzle d2, third throttling gas nozzle d3Diameter take respectively
7mm、9mm、11mm。
5. a kind of low permeability tight gas reservoir according to claim 2 explores the reasonable test method of gas testing well, which is characterized in that
The 1st well opening time t1, the 2nd well opening time t2, the 3rd well opening time t3, the 1st closed-in time t1s, the 2nd closing well
Time t2s, the 3rd closed-in time t3sIn want time closed-in time to be more than well opening time, and well opening time carried out by the following conditions it is true
It is fixed：
As permeability k<When 0.001mD, the 1st well opening time t1, the 2nd well opening time t2, the 3rd well opening time t3Ying
Between 200-300h；When permeability 0.001<k<When 0.01mD, the 1st well opening time t1, the 2nd well opening time t2, open the 3rd time
Well time t3It should be between 100-200h；When permeability 0.01<k<When 0.1mD, the 1st well opening time t1, the 2nd well opening time
t2, the 3rd well opening time t3It should be between 50-100h；When permeability 0.1<k<When 1mD, the 1st well opening time t1, open the 2nd time
Well time t2, the 3rd well opening time t3It should be between 20-50h；As permeability k>When 1mD, the 1st well opening time t1, open the 2nd time
Well time t2, the 3rd well opening time t3It should be between 10-20h.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356577A (en) * | 2018-11-28 | 2019-02-19 | 冀光 | Tight gas reservoir reserves measuring method based on gas-bearing formation Drilling ratio |
| CN111088974A (en) * | 2019-11-29 | 2020-05-01 | 中国石油集团川庆钻探工程有限公司 | Productivity evaluation method for determining unstable flowing pressure correction of low-permeability gas well |
| CN112211626A (en) * | 2020-10-30 | 2021-01-12 | 西南石油大学 | Optimization method for productivity well testing test type of heterogeneous gas reservoir gas well |
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| CN112211626A (en) * | 2020-10-30 | 2021-01-12 | 西南石油大学 | Optimization method for productivity well testing test type of heterogeneous gas reservoir gas well |
| CN112211626B (en) * | 2020-10-30 | 2022-03-11 | 西南石油大学 | Optimization method for productivity well testing test type of heterogeneous gas reservoir gas well |
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