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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 PDF

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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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coiled tubing
wall thickness
depth
gas production
collapse
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CN107939375A (en
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赵彬彬
陆红军
白晓弘
刘双全
汪雄雄
杨丹丹
李丽
樊莲莲
卫亚明
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Petrochina Co Ltd
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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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Abstract

本发明公开了一种起出连续油管用作速度管柱排水采气的快速判定方法，包括：计算连续油管抗拉强度和可下深度，反算起出的连续油管需要同时满足两者的最小壁厚t1；利用连续油管轴向拉应力下抗挤毁强度校核，反算起出的连续油管满足抗挤毁时的最小壁厚t2；利用壁厚检测仪测试现场起出连续油管的管壁厚实测值，并将管壁厚实测值与计算出的两个最小壁厚中的较大者相比较，若管壁厚实测值大于计算值，则起出连续油管能够重复用作速度管柱排水采气；反之，不可以。本方法省去了起出连续油管取样在实验室进行试验评价的繁琐手续，加快了采用速度管柱排水采气气井生产进度；采用该方法能够快速准确地判定起出连续油管是否可以用作速度管柱排水采气。The invention discloses a rapid determination method for pulling out the coiled tubing to be used as the velocity pipe string for drainage and gas production. Wall thickness t 1 ; check the collapse resistance strength under axial tensile stress of the coiled tubing, inversely calculate the coiled tubing to meet the minimum wall thickness t 2 when resisting collapse; use the wall thickness detector to test the coiled tubing from the site The measured value of the pipe wall thickness, and the measured value of the pipe wall thickness is compared with the larger of the two calculated minimum wall thicknesses. If the measured value of the pipe wall thickness is greater than the calculated value, the coiled tubing can be reused as Velocity string drainage and gas production; otherwise, not allowed. This method saves the tedious procedure of taking out the coiled tubing for sampling in the laboratory for testing and evaluation, and speeds up the production progress of the gas production well using the speed pipe string drainage; this method can quickly and accurately determine whether the coiled tubing can be used for speed Pipeline drainage and gas production.

Description

Quick judgment method for water drainage and gas production by taking out coiled tubing as velocity string
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:
Figure BDA0001455482640000021
wherein:
q1＝gk(D-t1)t1 (3)
Figure BDA0001455482640000022
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:
Figure BDA0001455482640000031
in the formula: y isPaEquivalent yield strength under axial stress, kPa; fAAxial stress, kPa; y isPMinimum nominal yield strength, kPa;
wherein:
Figure BDA0001455482640000032
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:
Figure BDA0001455482640000041
wherein:
q1＝gk(D-t1)t1 (3)
Figure BDA0001455482640000042
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:
Figure BDA0001455482640000051
in the formula: y isPaEquivalent yield strength under axial stress, kPa; fAAxial stress, kPa; y isPMinimum nominal yield strength, kPa;
wherein:
Figure BDA0001455482640000052
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)

1.一种起出连续油管用作速度管柱排水采气的快速判定方法，其特征在于：包括以下步骤：1. a quick determination method for taking out the coiled tubing as the speed pipe string drainage gas recovery, it is characterized in that: comprise the following steps: 1)计算连续油管抗拉强度和最大可下深度，反算起出的连续油管需要同时满足抗拉强度和最大可下深度的最小壁厚t1；1) Calculate the tensile strength of the coiled tubing and the maximum depth that can be lowered, and the coiled tubing obtained from the reverse calculation needs to meet the minimum wall thickness t 1 of both the tensile strength and the maximum depth that can be lowered; 令起出的连续油管最大可下深度等于起出的连续油管拟下入井的设计连续油管下深；The maximum allowable depth of the coiled tubing that is pulled out is equal to the designed coiled tubing depth for the coiled tubing to be run into the well; 连续油管抗拉强度通过下式计算：The tensile strength of coiled tubing is calculated by the following formula: Pj＝Yp[π(D2-d1 2)/4] (1)P j =Y p [π(D 2 -d 1 2 )/4] (1) 连续油管最大可下深度通过下式计算：The maximum dropable depth of the coiled tubing is calculated by the following formula:
Figure FDA0002742909630000011
Figure FDA0002742909630000011
 其中：in: q1＝gk(D-t1)t1 (3)q 1 =gk(Dt 1 )t 1 (3)
Figure FDA0002742909630000012
Figure FDA0002742909630000012
 式中：Pj为最小抗拉强度，MPa；YP为最小名义屈服强度，MPa；D为管体名义外径，mm；d1为连续油管最大可下深度管体内径，mm；H1为最大可下深度，m；m为安全系数；q1为单位连续油管最大可下深度管体长度的重量，N/m；t1为满足抗拉强度和最大可下深度时连续油管的壁厚，mm；g为重力加速度；k为常数；Where: P j is the minimum tensile strength, MPa; Y P is the minimum nominal yield strength, MPa; D is the nominal outer diameter of the pipe body, mm; d 1 is the inner diameter of the coiled tubing maximum depth, mm; H 1 is the maximum drop-down depth, m; m is the safety factor; q 1 is the weight of the length of the pipe body at the maximum drop-down depth per unit of coiled tubing, N/m; t 1 is the wall of the coiled tubing when the tensile strength and the maximum drop-down depth are met. Thickness, mm; g is the acceleration of gravity; k is a constant; 2)利用连续油管轴向拉应力下抗挤毁强度校核，反算起出的连续油管满足抗挤毁时的最小壁厚t2；2) Use the anti-collapse strength check under the axial tensile stress of the coiled tubing, and calculate the minimum wall thickness t 2 when the coiled tubing meets the anti-collapse; 3)利用壁厚检测仪测试现场起出连续油管的管壁厚实测值，并将管壁厚实测值与步骤1)和步骤2)计算出的两个最小壁厚中的较大者相比较，若管壁厚实测值大于步骤1)和步骤2)计算值，则起出连续油管能够重复用作速度管柱排水采气；反之，不可以。3) Use a wall thickness detector to test the measured value of the coiled tubing wall thickness from the site, and compare the measured value of the pipe wall thickness with the larger of the two minimum wall thicknesses calculated in steps 1) and 2). , if the measured value of the tube wall thickness is greater than the calculated value in steps 1) and 2), the coiled tubing can be used repeatedly for drainage and gas production of the velocity string; otherwise, it cannot. 2.根据权利要求1所述的起出连续油管用作速度管柱排水采气的快速判定方法，其特征在于：所述步骤2)中，连续油管轴向拉应力下抗挤毁强度通过下式计算：2. The method of claim 1, characterized in that: in the step 2), the anti-collapse strength under the axial tensile stress of the coiled tubing passes through the Formula calculation:
Figure FDA0002742909630000021
Figure FDA0002742909630000021
 式中：YPa为轴向应力下的当量屈服强度，kPa；FA为轴向应力，kPa；YP为最小名义屈服强度，kPa；Where: Y Pa is the equivalent yield strength under axial stress, kPa; F A is the axial stress, kPa; Y P is the minimum nominal yield strength, kPa; 其中：
Figure FDA0002742909630000022
in:
Figure FDA0002742909630000022
 G＝H1q2 (7)G=H 1 q 2 (7) q2＝gk(D-t2)t2 (8)q 2 =gk(Dt 2 )t 2 (8) 式中：G为管体自重，N；SA为连续油管横截面积，m2；D为管体名义外径，mm；d2为连续油管满足抗挤毁时管体内径，mm；H1为下入深度，m；q2为连续油管满足抗挤毁时油管单位长度的重量，N/m；t2为连续油管满足抗挤毁时所需的最小壁厚，mm；g为重力加速度；k为常数。In the formula: G is the self-weight of the pipe body, N; S A is the cross-sectional area of the coiled tubing, m 2 ; D is the nominal outer diameter of the pipe body, mm; d 2 is the inner diameter of the coiled tubing when the collapse resistance is satisfied, mm; H 1 is the running depth, m; q 2 is the weight per unit length of the coiled tubing when the coiled tubing meets the collapse resistance, N/m; t 2 is the minimum wall thickness required for the coiled tubing to meet the collapse resistance, mm; g is the gravity acceleration; k is a constant. 3.根据权利要求1所述的起出连续油管用作速度管柱排水采气的快速判定方法，其特征在于：所述步骤2)中，连续油管轴向拉应力下抗挤毁强度为连续油管抗作业机注入头对连续油管的夹持力。3. The method of claim 1, characterized in that: in the step 2), the anti-collapse strength under the axial tensile stress of the coiled tubing is continuous. The tubing resists the gripping force of the injection head of the operating machine on the coiled tubing. 4.根据权利要求3所述的起出连续油管用作速度管柱排水采气的快速判定方法，其特征在于：抗挤毁强度通过下式计算：4. The rapid determination method of taking out coiled tubing according to claim 3 is used as the quick determination method of velocity pipe string drainage and gas production, it is characterized in that: the collapse resistance strength is calculated by the following formula: Ypa＝N/1000S (9) Ypa =N/1000S (9) N＝5G (10)N=5G (10) S＝DH (11)S=DH (11) 式中：Ypa为起出连续油管的抗挤毁强度；N为注入头夹持力，N；S为注入头夹持块与连续油管接触面积，m2；G——管体自重，N；D——管体名义外径，mm；H为注入头夹持块与连续油管接触高度，m。In the formula: Y pa is the collapse resistance of the coiled tubing; N is the clamping force of the injection head, N; S is the contact area between the clamping block of the injection head and the coiled tubing, m 2 ; G—the weight of the pipe body, N ;D——nominal outer diameter of the pipe body, mm; H is the contact height between the injection head clamping block and the coiled tubing, m.
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