CN113464059A - Double-layer sleeve design method - Google Patents
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- CN113464059A CN113464059A CN202110468869.9A CN202110468869A CN113464059A CN 113464059 A CN113464059 A CN 113464059A CN 202110468869 A CN202110468869 A CN 202110468869A CN 113464059 A CN113464059 A CN 113464059A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000013461 design Methods 0.000 title claims abstract description 29
- 238000010168 coupling process Methods 0.000 claims abstract description 30
- 238000005859 coupling reaction Methods 0.000 claims abstract description 30
- 230000008878 coupling Effects 0.000 claims abstract description 29
- 239000004568 cement Substances 0.000 claims description 7
- 239000010410 layer Substances 0.000 description 57
- 238000004364 calculation method Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 9
- 238000010276 construction Methods 0.000 description 6
- 239000002356 single layer Substances 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention relates to a design method of a double-layer sleeve, wherein the double-layer sleeve comprises an outer-layer sleeve and an inner-layer sleeve; when the size of the outer casing is determined, the design method of the inner casing comprises the following steps: d1‑T1*2‑K≤W2≤D1‑T1*2‑K/2；D1‑T1*2‑2*K≤D2≤W2(ii) a When the size of the inner casing is determined, the design method of the outer casing comprises the following steps: w2+K/2≤D1‑2T1≤W2+K；W2+K/2+2T1≤D1≤W2+K+2T1；D1≤W1(ii) a Wherein, K is 25.4 mm; w1The outer diameter of the outer layer sleeve coupling; d1The nominal outer diameter of the outer casing; t is1The nominal wall thickness of the outer casing; w2The outer diameter of the inner layer casing coupling; d2Is the nominal outer diameter of the inner casing; t is2The nominal wall thickness of the inner casing; the invention can improve the yieldThe deformation resistance of the layer casing pipe is improved, and various performance indexes of the double-layer casing pipe are further improved.
Description
Technical Field
The invention belongs to the technical field of petroleum casings, and particularly relates to a design method of a double-layer casing.
Background
With the gradual increase of the drilling depth in the oil industry, particularly the gradual increase of the exploitation depth of the shale gas well in China, the damage ratio of the casing pipe of a single-layer casing pipe is increased year by year in the fracturing construction and transformation process of the shale gas well, and the capacity construction of the shale gas well is severely limited; meanwhile, as the drilling depth is continuously deepened, the huge external pressure load generated by a creep rock stratum or a gypsum layer puts higher requirements on the sleeve, and the single-layer sleeve is easy to deform to influence the subsequent construction operation.
Patent number ZL201921131922.0 discloses a double-deck combination sleeve, and this combination sleeve comprises interior thread coupling joint, external thread coupling joint, inlayer sleeve pipe, outer sleeve pipe, and inlayer sleeve pipe and outer sleeve pipe twist simultaneously and connect to a coupling, form certain annular space in the middle of the inlayer sleeve pipe. The double-layer combined sleeve of the type has strict requirements on the processing length, the processing precision and the like of an inner-layer sleeve and an outer-layer sleeve, and the processing technical level of the oil sleeve cannot be met at present; meanwhile, the annular space between the inner casing and the outer casing cannot be used for cementing, and the middle of the inner casing and the outer casing cannot be added with supported cementing cement, so that the performance of the double-layer casing cannot be further improved.
Therefore, in order to solve the problem that the conventional single-layer casing pipe is damaged and deformed in the fracturing construction operation process, the stability of the casing pipe in the fracturing construction operation and service process is improved, the double-layer casing pipe design method capable of improving the deformation resistance of the casing pipe at the production zone and further improving various performance indexes of the double-layer casing pipe is provided, and the method has important practical significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a double-layer casing design method which can improve the deformation resistance of a casing at a production zone and further improve various performance indexes of the double-layer casing.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a double-layer sleeve design method comprises an outer layer sleeve and an inner layer sleeve;
when the size of the outer casing is determined, the design method of the inner casing comprises the following steps:
D1-T1×2-K≤W2≤D1-T1×2-K/2 A1
D1-T1×2-2×K≤D2≤W2 A2
wherein, K is 25.4 mm; w1The outer diameter of the outer layer sleeve coupling; d1The nominal outer diameter of the outer casing; t is1The nominal wall thickness of the outer casing; w2The outer diameter of the inner layer casing coupling; d2Is the nominal outer diameter of the inner casing; t is2The nominal wall thickness of the inner casing; based on the formulas A1 and A2: w2、T2Selection according to API5CT specifications, D2Selecting according to API5CT and actual working conditions; when the outer casing adopts a direct-connection type casing, W1＝D1(ii) a When the outer sleeve adopts a sleeve with a hoop, W1＞D1。
When the size of the inner casing is determined, the design method of the outer casing comprises the following steps:
W2+K/2≤D1-2T1≤W2+K A3
W2+K/2+2T1≤D1≤W2+K+2T1 A4
D1≤W1 A5
wherein, K is 25.4 mm; w1The outer diameter of the outer layer sleeve coupling; d1The nominal outer diameter of the outer casing; t is1The nominal wall thickness of the outer casing; w2The outer diameter of the inner layer casing coupling; d2Is the nominal outer diameter of the inner casing; t is2The nominal wall thickness of the inner casing; on the basis of the formulae A3, A4, A5: t is1D1 is selected according to API5CT specifications, W1Selecting according to API5CT and actual working conditions; when the inner sleeve adopts a direct-connection sleeve, W2＝D2(ii) a When the inner layer sleeve adopts a sleeve with a hoop, W2＞D2。
The main design basis of the invention is that firstly, a reasonable gap is ensured to exist between the double-layer sleeves, the frictional resistance between the sleeves in the process of going down the well is reasonably reduced, and the second layer of sleeves can be ensured to smoothly complete the operation of going down the well; secondly, a reasonable gap is required to be ensured between the double-layer sleeves, and an enough environment control space is provided for cement well cementation between the double-layer sleeves. A large number of scientific calculations and well-descending tests prove that cement filling and well cementation between the inner casing and the outer casing can be smoothly carried out under the normal condition as long as the inner casing can be ensured to be smoothly descended in the well-descending process, so that the key point of the invention is how to reasonably control reasonable gaps and reasonable frictional resistance of the inner casing and the outer casing.
Because the double-layer casing design of the invention needs to put the outer casing in, then put the inner casing in and then carry out the well cementation operation on the inner casing, certain friction (frictional resistance, hereinafter referred to as frictional resistance) exists between the inner casing and the outer casing, if the matching between the inner casing and the outer casing is poor: such as the inner and outer casing annular space (D)1-2T1-W2) Small, possibly causing well descending failure due to over-large friction resistance in the well descending process; inner and outer casing annular space (D)1-2T1-W2) Too large, will result in increased cost for single well drilling, decreased oil and gas production, and increased drilling costThe method is as follows. Matching the gauge selection of the inner and outer casing is therefore a problem that must be addressed by the double casing design.
Along with the increasing of well depth horizontal wells and extended reach wells, the matching of double-layer sleeves is more and more emphasized, the frictional resistance of the inner-layer sleeves is generally required to be calculated when the double-layer sleeves are put in, the calculation method of the frictional resistance is various, for example, on the premise that the factors of the pressure difference between the inside and the outside of the pipe column are ignored, the pipe column is decomposed into a plurality of pipe column unit sections, a balance equation is established by utilizing the stress balance principle of the pipe column in the well, the frictional resistance of the pipe column when the well is put in the well can be calculated, and whether the double-layer sleeves are matched or not can be simply obtained through calculation, so that the soft drill pipe model is obtained.
However, the model has certain limitation and has great error on-site friction resistance calculation, so that scholars at home and abroad put forward a great deal of modification on the model later to form a great deal of mathematical calculation formulas; in recent years, with the development of computers and simulation calculation, the friction calculation introduces a simulation calculation method, and although the simulation calculation method has a certain improvement on the accuracy of friction calculation, the simulation calculation method has high requirements on the professional skills of technicians, and meanwhile, the calculation time cost is high.
Therefore, the selection and calculation method of the specifications of the inner-layer casing and the outer-layer casing, which is related by the invention, carries out the definition of an empirical formula on the basis of fully considering the reasonable friction resistance in the process of entering the inner-layer casing. The following formula provides the following simplified calculation formula of the specifications of the inner layer and the outer layer of the double-layer casing according to the years of casing design experience and finite element friction calculation experience of an inventor, and the specification design of the inner layer and the outer layer of the double-layer casing can be obtained according to the experimental formula, so that the inner layer casing can be smoothly put in.
The invention adopts the design of an inner double-layer sleeve and an outer double-layer sleeve, the inner sleeve can be designed by adopting a direct-connected sleeve or a common coupling sleeve, the outer sleeve can be designed by adopting a direct-connected sleeve or a common coupling sleeve, and the annular space between the outer sleeve and the inner sleeve is cemented by cementing cement; in the casing running process, an outer casing needs to be put in firstly, then an inner casing is put in the middle of the outer casing, and then the annular space between the inner casing and the outer casing is subjected to well cementation and cement cementing; the double-layer sleeve has no strict requirements on parameters such as the processing length of the sleeve.
The invention has the advantages and positive effects that:
the double-layer sleeve design can greatly reduce the damage ratio of the sleeve in the fracturing construction operation process; the external extrusion damage resistance of the double-layer casing pipe related by the invention can be improved by more than one time of the external extrusion damage resistance of the original single-layer casing pipe design; the internal pressure resistance of the double-layer sleeve related by the invention can be improved to more than one time of the internal pressure resistance of the original single-layer sleeve design; by adopting the design of the double-layer sleeve, the steel grade, the wall thickness and other related parameters of the selected type of the sleeve can be reduced, and the cost of the sleeve is reduced.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a schematic structural diagram of a double-walled casing provided in an embodiment of the present invention;
Detailed Description
First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implicit in any embodiment or any single feature shown or implicit in any drawing may still be combined or subtracted between any of the features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity, the same or similar features may be indicated in only one place in the same drawing.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The present invention will be specifically described with reference to fig. 1.
Example 1
A double-layer sleeve design method comprises an outer-layer sleeve 1 and an inner-layer sleeve 3;
when the size of the outer casing is determined, the design method of the inner casing comprises the following steps:
D1-T1×2-K≤W2≤D1-T1×2-K/2 A1
D1-T1×2-2×K≤D2≤W2 A2
wherein, K is 25.4 mm; w1The outer diameter of the outer layer sleeve coupling; d1The nominal outer diameter of the outer casing; t is1The nominal wall thickness of the outer casing; w2The outer diameter of the inner layer casing coupling; d2Is the nominal outer diameter of the inner casing; t is2The nominal wall thickness of the inner casing; based on the formulas A1 and A2: w2、T2Selection according to API5CT specification, D2Selecting according to API5CT and actual working conditions;
when the size of the inner casing is determined, the design method of the outer casing comprises the following steps:
W2+K/2≤D1-2T1≤W2+K A3
W2+K/2+2T1≤D1≤W2+K+2T1 A4
D1≤W1 A5
wherein, K is 25.4 mm; w1The outer diameter of the outer layer sleeve coupling; d1The nominal outer diameter of the outer casing; t is1The nominal wall thickness of the outer casing; w2The outer diameter of the inner layer casing coupling; d2Is the nominal outer diameter of the inner casing; t is2The nominal wall thickness of the inner casing; on the basis of the formulae A3, A4, A5: t is1D1 is selected according to API5CT specifications, W1And selecting according to the API5CT and the actual working condition.
Moreover, the outer casing adopts a direct connection type casing or a casing with a hoop; the inner layer casing adopts a direct connection type casing or a casing with a hoop. As shown in fig. 1, the outer casing 1 of the present embodiment is a casing of a band coupling type, such as a first collar 2; the inner casing 3 adopts a casing with a coupling, such as a second coupling 4; in addition, well cementation cement 5 can be filled between the outer casing and the inner casing.
Example 2
The inner casing was selected using the method in example 1:
it is known that: outer diameter W of outer layer sleeve coupling1200.03mm, nominal outer diameter D of outer sleeve1177.80mm, nominal wall thickness T of outer sleeve110.36mm, the following calculation was obtained:
D1-T1×2-K≤W2≤D1-T1×2-K/2
K＝25.4mm
177.80-10.36×2-25.4≤W2≤177.8-10.36×2-25.4/2
131.68≤W2≤144.38
the proposal W is based on the coupling outer diameter provided in API5CT table C332Selecting 133.35 mm; namely:
W2＝133.35mm
D1-T1×2-2×K≤D2≤W2
K＝25.4mm
177.8-10.36×2-25.4×2≤D2≤W2
106.28≤D2≤133.35
the outer diameter of the tube is recommended according to API5CT table C1, recommendation D2Selecting 114.30 mm; namely:
D2＝114.30mm
wall thickness T2According to API5CT C1 or C2 and combined with actual use conditions, for example, recommended selection of wall thickness is 5.21, 5.69, 6.35, 7.37 and 8.56, and selection can be performed according to actual requirements, for example, 6.35 wall thickness is selected.
To sum up, the outer diameter W of the outer layer sleeve coupling is fixed1200.03mm, nominal outer diameter D of outer sleeve1177.80mm, nominal wall thickness T of outer sleeve1The parameters of the inner sleeve calculated for 10.36mm are as follows:
wall thickness T2＝6.35mm
Outer diameter D2＝114.30mm
Coupling external diameter W2＝133.35mm。
Example 3
The outer casing was selected using the method in example 1:
it is known that: inner layer casing coupling external diameter W2200.03mm, nominal outer diameter D of inner sleeve2177.80mm, nominal wall thickness T of inner sleeve210.36mm, the following calculation was obtained:
W2+K/2≤D1-2T1≤W2+K
W2+K/2+2T1≤D1≤W2+K+2T1
K＝25.4mm
200.03+25.4/2≤D1-2T1≤200.03+25.4
212.73+2T1≤D1≤225.43+2T1
the wall thickness is recommended according to API5CT table C1 and table C1, for example 11.99mm wall thickness is chosen, i.e.:
T1＝11.99mm；
236.71≤D1≤249.41
the nominal outer diameter of 244.48mm was chosen according to the API5CT table C1 and table C1 recommendations for outer diameters, namely:
D1＝244.48
D1≤W1
244.48≤W1
the proposal W is based on the coupling outer diameter provided in API5CT table C331Selecting 269.88 mm; namely:
W1＝269.88mm
to sum up, the outer diameter W of the casing coupling at the fixed inner layer2200.03mm, nominal outer diameter D of inner sleeve2177.80mm, nominal wall thickness T of inner sleeve2The calculated parameters for the outer sleeve at 10.36mm are as follows:
wall thickness T1＝11.99mm
Outer diameter D1＝244.48mm
Coupling external diameter W1＝269.88mm。
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (4)
1. A design method of a double-layer sleeve is characterized by comprising the following steps: the double-layer sleeve comprises an outer-layer sleeve and an inner-layer sleeve;
when the size of the outer casing is determined, the design method of the inner casing comprises the following steps:
D1-T1×2-K≤W2≤D1-T1×2-K/2 A1
D1-T1×2-2×K≤D2≤W2 A2
wherein, K is 25.4 mm; w1The outer diameter of the outer layer sleeve coupling; d1The nominal outer diameter of the outer casing; t is1The nominal wall thickness of the outer casing; w2Is an inner layer sleeveThe outer diameter of the pipe coupling; d2Is the nominal outer diameter of the inner casing; t is2The nominal wall thickness of the inner casing; based on the formulas A1 and A2: w2、T2Selection according to API5CT specification, D2Selecting according to API5CT and actual working conditions;
when the size of the inner casing is determined, the design method of the outer casing comprises the following steps:
W2+K/2≤D1-2T1≤W2+K A3
W2+K/2+2T1≤D1≤W2+K+2T1 A4
D1≤W1 A5
wherein, K is 25.4 mm; w1The outer diameter of the outer layer sleeve coupling; d1The nominal outer diameter of the outer casing; t is1The nominal wall thickness of the outer casing; w2The outer diameter of the inner layer casing coupling; d2Is the nominal outer diameter of the inner casing; t is2The nominal wall thickness of the inner casing; on the basis of the formulae A3, A4, A5: t is1D1 is selected according to API5CT specifications, W1And selecting according to the API5CT and the actual working condition.
2. The method of claim 1, wherein the method comprises the steps of: the outer casing adopts a direct connection type casing or a casing with a hoop.
3. A double-walled casing design method according to claim 1 or 2, characterized in that: the inner layer casing adopts a direct connection type casing or a casing with a hoop.
4. A double-walled casing design method according to claim 3 wherein: and well cementation cement can be filled between the outer casing and the inner casing.
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| CN111594060A (en) * | 2020-07-13 | 2020-08-28 | 盘锦华晨石油装备制造有限公司 | Non-vacuum heat insulation oil pipe and production process thereof |
| CN212774167U (en) * | 2020-07-13 | 2021-03-23 | 盘锦华晨石油装备制造有限公司 | Non-vacuum heat insulation oil pipe |
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|---|---|---|---|---|
| CN2818762Y (en) * | 2005-07-26 | 2006-09-20 | 吐哈石油勘探开发指挥部钻井公司 | Lengthened thread sleeve for drilling well |
| CN201705223U (en) * | 2010-06-10 | 2011-01-12 | 中国石油化工集团公司 | Small casing pipe well oil pipe |
| CA2755609A1 (en) * | 2010-10-15 | 2012-04-15 | Grant George | Downhole extending ports |
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