CN107939375B - Quick judgment method for water drainage and gas production by taking out coiled tubing as velocity string - Google Patents
Quick judgment method for water drainage and gas production by taking out coiled tubing as velocity string Download PDFInfo
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- CN107939375B CN107939375B CN201711064635.8A CN201711064635A CN107939375B CN 107939375 B CN107939375 B CN 107939375B CN 201711064635 A CN201711064635 A CN 201711064635A CN 107939375 B CN107939375 B CN 107939375B
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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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- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a quick judgment method for water drainage and gas production by using a pull-out coiled tubing as a speed string, which comprises the following steps: calculating the tensile strength and the down depth of the coiled tubing, and simultaneously satisfying the minimum wall thickness t of the coiled tubing and the down depth1(ii) a The collapse resistance strength of the coiled tubing under the axial tensile stress is used for checking, and the reverse calculation is carried out on the minimum wall thickness t of the coiled tubing when the coiled tubing meets the collapse resistance2(ii) a Utilizing a wall thickness detector to test the measured wall thickness value of the coiled tubing at the site, comparing the measured wall thickness value with the larger of the two calculated minimum wall thicknesses, and if the measured wall thickness value is larger than the calculated value, the coiled tubing can be repeatedly used as the velocity string to discharge water and produce gas; otherwise, it is not possible. The method saves the tedious procedure of taking out the coiled tubing for sampling and carrying out test evaluation in a laboratory, and accelerates the production progress of the gas production well adopting the speed tubular column for drainage; by adopting the method, whether the drawn coiled tubing can be used as the speed string for water drainage and gas recovery can be rapidly and accurately judged.
Description
Technical Field
The invention relates to a quick judgment method for judging whether a drawn coiled tubing can be repeatedly used as a speed tubular column for water drainage and gas production, which is particularly suitable for a liquid accumulation well which is about to adopt an old coiled tubing for water drainage and gas production of the speed tubular column.
Background
The continuous oil pipe speed pipe column water drainage gas production technology has the advantages of obvious yield increase effect, short investment recovery period, no maintenance and the like, becomes one of three main body water drainage gas production technologies of the gas field in the Changqing of the Chinese petroleum, the contribution rate to the water drainage gas production and the gas production of the gas field is increased year by year, 550 wells are applied in an accumulated mode, the application scale is enlarged year by year, and the accumulated yield increase gas amount reaches 10.25 multiplied by 108m3Through the introduction and demonstration of the technology, the technology is driven to be applied to more than 150 wells in gas fields such as Qinghai, Xinjiang, Daniu land and the like. The coiled tubing speed string water drainage gas production technology can fully play a role in water drainage and gas production for a long time, but when the actual yield of a gas well is lower than the critical liquid carrying flow of the coiled tubing used at the last stage of gas well production, liquid loading can occur in the gas well again. At the moment, the coiled tubing in the shaft is pulled out, the performance evaluation of the tubing is carried out, after the requirement of drainage and gas production of the effusion old well is met, the coiled tubing is lowered to other suitable effusion gas wells to carry out the speed tubular column drainage and gas production again, and the cost of the tubing can be saved by about 30 ten thousand yuan through the recycling of the tubing for a single well.
The prior art has at least the following problems:
the evaluation indexes related to the traditional coiled tubing evaluation method comprise: the chemical composition, strength, corrosion rate, elongation, hardness and other indexes of the pipe are required to be sampled by the coiled tubing, and then the sampled coiled tubing is sent back to a laboratory for test evaluation, so that more manpower and material resources are consumed, and the production of a gas well which needs to adopt a speed pipe column for water drainage and gas production is delayed; the traditional coiled tubing evaluation method mainly aims at new tubing used as an operation tubing, the operation tubing is mainly used for sand washing and fracturing of a new well, the tubing is subject to severe working conditions such as high temperature, high pressure and high salinity in the initial stage of the new well, the coiled tubing is mainly used for old wells in the middle and later stages when used as a speed tubing, the working conditions are low pressure and low salinity, and obviously, the traditional coiled tubing evaluation method is not suitable.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method for quickly and accurately judging whether a drawn coiled tubing can be repeatedly used as a speed tubular column for water drainage and gas production.
The invention is realized by the following technical scheme.
A quick judgment method for water drainage and gas production by using a pull-out coiled tubing as a speed string comprises the following steps:
1) calculating the tensile strength and the downward depth of the coiled tubing, and calculating the minimum wall thickness t of the coiled tubing which needs to meet the requirements of both the tensile strength and the downward depth1；
2) The collapse resistance strength of the coiled tubing under the axial tensile stress is used for checking, and the reverse calculation is carried out on the minimum wall thickness t of the coiled tubing when the coiled tubing meets the collapse resistance2；
3) Testing the wall thickness measured value of the coiled tubing at the site by using a wall thickness detector, comparing the wall thickness measured value with the larger one of the two minimum wall thicknesses calculated in the steps 1) and 2), and if the wall thickness measured value is larger than the calculated values in the steps 1) and 2), the coiled tubing can be repeatedly used as the velocity string drainage gas production; otherwise, it is not possible.
Preferably, in step 1), the coiled tubing tensile strength is calculated by the following formula:
Pj＝Yp[π(D2-d2)/4] (1)
in the formula: pjMinimum tensile strength, MPa; y isPMinimum nominal yield strength, MPa; d is the nominal outer diameter of the pipe body and is mm; d is the inner diameter of the pipe body in mm.
Preferably, in step 1), the coiled tubing drawable depth is calculated by the following formula:
wherein:
q1＝gk(D-t1)t1 (3)
in the formula: h1M, the maximum drawable depth; pjIs the minimum tensile strength, N; m is a safety factor; q. q.s1Weight per unit length, N/m; t is t1The wall thickness of the coiled tubing is mm in order to meet the tensile strength and the downward depth; g is the acceleration of gravity; k is a constant; d is the nominal outer diameter of the pipe body and is mm; d is the inner diameter of the pipe body in mm.
Preferably, in the step 2), the collapse resistance strength of the coiled tubing under the axial tensile stress is calculated by the following formula:
in the formula: y isPaEquivalent yield strength under axial stress, kPa; fAAxial stress, kPa; y isPMinimum nominal yield strength, kPa;
wherein:
G＝H1q2 (7)
q2＝gk(D-t2)t2 (8)
in the formula: g is the self weight of the pipe body, N; sAIs the cross-sectional area of the coiled tubing, m2(ii) a D is the inner diameter of the pipe body, mm; d is the inner diameter of the pipe body, mm; h1M is the depth of penetration; q. q.s2Weight per unit length, N/m; t is t2The minimum wall thickness, mm, required for the coiled tubing to meet the collapse resistance; g is the acceleration of gravity; k is a constant.
Preferably, in the step 2), the collapse resistance strength of the coiled tubing is the clamping force of the coiled tubing against the injection head of the operation machine.
Preferably, the collapse resistance is calculated by the following formula:
Ypa＝N/1000S (9)
N＝5G (10)
S＝DH (11)
in the formula: y ispaThe anti-collapse strength of the coiled tubing is set; n is the clamping force of the injection head, N; s is the contact area of the injection head clamping block and the coiled tubing, m2(ii) a G is the dead weight of the pipe body, N; d is the nominal outer diameter of the pipe body, mm; h is the contact height of the injection head clamping block and the coiled tubing, and m is the contact height of the injection head clamping block and the coiled tubing.
The invention has the beneficial effects that:
the method saves the tedious procedure of taking out the coiled tubing for sampling and carrying out test evaluation in a laboratory, and accelerates the production progress of the gas production well adopting the speed tubular column for drainage; by adopting the method, whether the drawn coiled tubing can be used for drainage and gas production of the velocity string can be rapidly and accurately judged, and the method is an effective and feasible evaluation method for the drawn coiled tubing.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the calculation method of the present invention is further described in detail below with reference to examples.
The invention discloses a quick judgment method for water drainage and gas production by using a pull-out coiled tubing as a velocity string, which comprises the following steps:
1) and calculating the tensile strength and the drawable depth of the coiled tubing, and calculating the minimum wall thickness of the coiled tubing and the drawable depth of the coiled tubing in a reverse manner.
When coiled tubing is run into a well, the coiled tubing reaches the maximum depth, the tensile load on the wellhead is the largest due to the self weight of the tubing, and therefore the tubing needs to have enough wall thickness to ensure that the coiled tubing at the wellhead is not broken.
The coiled tubing tensile strength is calculated by the following formula:
Pj＝Yp[π(D2-d2)/4] (1)
in the formula: pjMinimum tensile strength, MPa; y isPMinimum nominal yield strength, MPa; d is the nominal outer diameter of the pipe body and is mm; d is the inner diameter of the pipe body in mm.
The coiled tubing drawdown depth is calculated by:
wherein:
q1＝gk(D-t1)t1 (3)
in the formula: h1M, the maximum drawable depth; pjIs the minimum tensile strength, N; m is a safety coefficient of 1.30-1.50; q. q.s1Weight per unit length, N/m; t is t1The wall thickness of the coiled tubing is mm in order to meet the tensile strength and the downward depth; g is the acceleration of gravity, 9.8N/kg; k is a constant, 0.0246615; d is the nominal outer diameter of the pipe body and is mm; d is the inner diameter of the pipe body in mm.
The equations (1), (2), (3) and (4) form an equation set, d can be solved, and then the minimum wall thickness t required when the coiled tubing meets a certain depth is calculated1。
2) The collapse resistance strength of the coiled tubing under the axial tensile stress is used for checking, and the reverse calculation is carried out on the minimum wall thickness t of the coiled tubing when the coiled tubing meets the collapse resistance2。
When the coiled tubing reaches the maximum depth, the tensile load on the pipe body is the maximum, the clamping force of the injection head on the coiled tubing operation machine on the coiled tubing is the maximum, so that the coiled tubing is free from sliding and slipping, the strength of an external agent on the coiled tubing is the maximum, and therefore the coiled tubing has enough wall thickness to ensure that the coiled tubing at a wellhead is not clamped flat.
The collapse resistance strength of the coiled tubing under axial tensile stress is calculated by the following formula:
in the formula: y isPaEquivalent yield strength under axial stress, kPa; fAAxial stress, kPa; y isPMinimum nominal yield strength, kPa;
wherein:
G＝H1q2 (7)
q2＝gk(D-t2)t2 (8)
in the formula: g is the self weight of the pipe body, N; sAIs the cross-sectional area of the coiled tubing, m2(ii) a D is the inner diameter of the pipe body, mm; d is the inner diameter of the pipe body, mm; h1M is the depth of penetration; q. q.s2Weight per unit length, N/m; t is t2The minimum wall thickness, mm, required for the coiled tubing to meet the collapse resistance; g is the acceleration of gravity; k is a constant.
When the coiled tubing is put into a shaft of an old accumulated liquid well for operation, a gas well is in a production state, the pressure outside the coiled tubing is very low, the external agent force of the pressure on the coiled tubing can be ignored, the clamping force of an injection head of a coiled tubing operation machine on the coiled tubing is mainly considered, and the clamping force is the extrusion damage pressure.
The collapse resistance was calculated by the following formula:
Ypa＝N/1000S (9)
N＝5G (10)
S＝DH (11)
in the formula: y ispaThe anti-collapse strength of the coiled tubing is set; n is the clamping force of the injection head, N; s is the contact area of the injection head clamping block and the coiled tubing, m2(ii) a G is the dead weight of the pipe body, N; d is the nominal outer diameter of the pipe body, mm; h is the contact height of the injection head clamping block and the coiled tubing, and m is the contact height of the injection head clamping block and the coiled tubing.
3) Testing the wall thickness measured value of the coiled tubing at the site by using a wall thickness detector, comparing the wall thickness measured value with the larger one of the two minimum wall thicknesses calculated in the steps 1) and 2), and if the wall thickness measured value is larger than the calculated values in the steps 1) and 2), the coiled tubing can be repeatedly used as the velocity string drainage gas production; otherwise, it is not possible.
Specific examples are given below to further illustrate the present invention.
The Changqing Su Li Ge gas field Su A well is speeded up by using domestic CT70 coiled tubingAfter 5 years of drainage and gas production of the pipe column, the Su A well is basically exhausted, the coiled tubing is planned to be taken out, and the Su B well filled with liquid is put into the pipe column to continue to conduct speed pipe column drainage and gas production after the pipe is detected to be qualified. Minimum nominal yield strength Y of domestic CT70 coiled tubingP483MPa, nominal external diameter D of pipe body of 38.1mm, and depth H under coiled tubing designed for Su B well1The safety factor m is 1.3 for 3230m, and the known parameters are substituted into the formulas (1), (2), (3) and (4) to obtain the corresponding pipe wall thickness t with the pipe inner diameter d being 33.6mm1Is 2.25 mm.
The contact area S of an injection head clamping block and the coiled tubing of the domestic LG180/38 coiled tubing operation machine adopted by the pipe laying operation at this time is 0.04572m2The contact height H of the injection head clamping block and the coiled tubing is 1.2m, all the parameters are substituted into the formulas (5), (6), (7), (8), (9), (10) and (11), the inner diameter d of the pipe body is solved to be 33.16mm, and the corresponding wall thickness t of the pipe body is solved2Is 2.47 mm.
In conclusion, the measured wall thickness of the coiled tubing from the sua well must be larger than 2.47mm to meet the requirements of the sub well for water drainage and gas production. When the pipe is lifted on site, a wall thickness detector is adopted to test a plurality of groups of wall thicknesses, wherein the minimum wall thickness is 2.95mm, which shows that the coiled tubing lifted out of the Su A well can be repeatedly used as the speed pipe column of the Su B well for water drainage and gas production.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (4)
1. A quick judgment method for water drainage and gas production by taking a coiled tubing as a speed string is characterized by comprising the following steps: the method comprises the following steps:
1) calculating the tensile strength and the maximum drawable depth of the coiled tubing, and calculating the minimum wall thickness t of the coiled tubing which needs to meet the requirements of the tensile strength and the maximum drawable depth at the same time1；
Enabling the maximum drawable depth of the drawn-out coiled tubing to be equal to the designed coiled tubing drawable depth of the drawn-out coiled tubing to be drawn into the well;
the coiled tubing tensile strength is calculated by the following formula:
Pj＝Yp[π(D2-d1 2)/4] (1)
the maximum drawdown depth of the coiled tubing is calculated by the following formula:
wherein:
q1＝gk(D-t1)t1 (3)
in the formula: pjMinimum tensile strength, MPa; y isPMinimum nominal yield strength, MPa; d is the nominal outer diameter of the pipe body and is mm; d1The inner diameter of the pipe body is mm which is the maximum depth of the coiled tubing; h1M, the maximum drawable depth; m is a safety factor; q. q.s1The weight of the pipe body with the maximum depth of the coiled tubing per unit length, N/m; t is t1The wall thickness of the coiled tubing is mm in order to meet the tensile strength and the maximum drawable depth; g is the acceleration of gravity; k is a constant;
2) the collapse resistance strength of the coiled tubing under the axial tensile stress is used for checking, and the reverse calculation is carried out on the minimum wall thickness t of the coiled tubing when the coiled tubing meets the collapse resistance2；
3) Testing the wall thickness measured value of the coiled tubing at the site by using a wall thickness detector, comparing the wall thickness measured value with the larger one of the two minimum wall thicknesses calculated in the steps 1) and 2), and if the wall thickness measured value is larger than the calculated values in the steps 1) and 2), the coiled tubing can be repeatedly used as the velocity string drainage gas production; otherwise, it is not possible.
2. The quick judgment method for water drainage and gas production by taking out the coiled tubing as the speed string according to claim 1, characterized in that: in the step 2), the collapse resistance strength of the coiled tubing under the axial tensile stress is calculated by the following formula:
in the formula: y isPaEquivalent yield strength under axial stress, kPa; fAAxial stress, kPa; y isPMinimum nominal yield strength, kPa;
wherein:
G＝H1q2 (7)
q2＝gk(D-t2)t2 (8)
in the formula: g is the self weight of the pipe body, N; sAIs the cross-sectional area of the coiled tubing, m2(ii) a D is the nominal outer diameter of the pipe body and is mm; d2The inner diameter of the pipe body is mm when the coiled tubing is anti-collapse; h1M is the depth of penetration; q. q.s2The weight per unit length of the coiled tubing when the coiled tubing is anti-collapse is satisfied, N/m; t is t2The minimum wall thickness, mm, required for the coiled tubing to meet the collapse resistance; g is the acceleration of gravity; k is a constant.
3. The quick judgment method for water drainage and gas production by taking out the coiled tubing as the speed string according to claim 1, characterized in that: in the step 2), the collapse resistance strength of the coiled tubing under the axial tensile stress is the clamping force of the coiled tubing anti-operation machine injection head on the coiled tubing.
4. The quick judgment method for water drainage and gas production by taking out the coiled tubing as the speed string according to claim 3, characterized in that: the collapse resistance was calculated by the following formula:
Ypa＝N/1000S (9)
N＝5G (10)
S＝DH (11)
in the formula: y ispaThe anti-collapse strength of the coiled tubing is set; n is the clamping force of the injection head, N; s is the contact area of the injection head clamping block and the coiled tubing, m2(ii) a G is the dead weight of the pipe body, N; d is the nominal outer diameter of the pipe body, mm; h is the contact height of the injection head clamping block and the coiled tubing, and m is the contact height of the injection head clamping block and the coiled tubing.
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| CN201711064635.8A CN107939375B (en) | 2017-11-02 | 2017-11-02 | Quick judgment method for water drainage and gas production by taking out coiled tubing as velocity string |
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| CN107939375B true CN107939375B (en) | 2021-01-29 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6004639A (en) * | 1997-10-10 | 1999-12-21 | Fiberspar Spoolable Products, Inc. | Composite spoolable tube with sensor |
| CN102465671A (en) * | 2010-11-18 | 2012-05-23 | 常萍 | Triaxial stress strength designing method for vertical well casing string |
| CN103726796A (en) * | 2012-10-15 | 2014-04-16 | 代文姣 | Tri-axial stress strength design method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7458267B2 (en) * | 2004-11-17 | 2008-12-02 | Halliburton Energy Services, Inc. | Acoustic emission inspection of coiled tubing |
| US8544339B2 (en) * | 2009-12-30 | 2013-10-01 | Schlumberger Technology Corporation | Life monitor for a well access line |
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2017
- 2017-11-02 CN CN201711064635.8A patent/CN107939375B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6004639A (en) * | 1997-10-10 | 1999-12-21 | Fiberspar Spoolable Products, Inc. | Composite spoolable tube with sensor |
| CN102465671A (en) * | 2010-11-18 | 2012-05-23 | 常萍 | Triaxial stress strength designing method for vertical well casing string |
| CN103726796A (en) * | 2012-10-15 | 2014-04-16 | 代文姣 | Tri-axial stress strength design method |
Non-Patent Citations (3)
| Title |
|---|
| 含圆锥形腐蚀坑油管的剩余强度研究;朱加强等;《钢管》;20100630;第45卷(第3期);第62-67页 * |
| 连续油管在含H2S/CO2环境中的腐蚀行为研究;祝成龙;《中国优秀硕士学位论文全文数据库.工程科技I辑》;20140715;第122-124页 * |
| 连续油管速度管柱带压起管及管材重复利用;白晓弘等;《石油钻采工艺》;20150531;第37卷(第3期);第41-47页 * |
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