CN110469320B - Lost-return lost circulation equivalent density calculation method - Google Patents

Lost-return lost circulation equivalent density calculation method Download PDF

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CN110469320B
CN110469320B CN201910707356.1A CN201910707356A CN110469320B CN 110469320 B CN110469320 B CN 110469320B CN 201910707356 A CN201910707356 A CN 201910707356A CN 110469320 B CN110469320 B CN 110469320B
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闫振峰
郑力会
张艳
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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
    • 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

A lost circulation equivalent density calculation method comprises the following steps: (a) Calculating a pressure gradient corresponding to the slurry structural force according to the slurry dynamic shear force; (b) Calculating the increased pressure of the bottom hole or weak layer according to the pressure gradient formed by the mud structural force; (c) Calculating a bottom hole or weak layer final pressure according to the bottom hole or weak layer increased pressure; (d) And calculating the equivalent density when the lost return leakage of the bottom hole or the weak layer occurs according to the final pressure of the bottom hole or the weak layer. The method disclosed by the invention considers the drilling fluid dynamic shear force, avoids the defect of vertical pressure selection in the drilling process in the conventional lost-return leakage equivalent calculation, realizes the quick calculation of the lost-return leakage equivalent, shortens the leakage plugging time and reduces the operation risk.

Description

Lost-return lost circulation equivalent density calculation method
Technical Field
The invention belongs to the field of oil and gas field exploration and development, and particularly relates to a lost-return leakage equivalent density calculation method.
Background
Lost-return leakage is one of common underground complex conditions in petroleum drilling engineering operation, is a long-pending major difficult problem in well drilling, and causes great harm to oil and gas exploration, well drilling and development operation. The lost circulation can occur in each operation link of drilling, after casing, well cementation and the like. The lost circulation not only loses a large amount of drilling fluid and plugging materials, loses drilling time and prolongs the well construction period, but also can cause a series of other underground complex conditions such as blowout, well collapse, drilling sticking and the like. For complex wells with multiple leakage layers, accurate calculation of the equivalent density of the leakage layers is related to rapid slurry preparation on site, and the method is also the key for improving the leakage stopping efficiency. The lost-return lost circulation has many reasons, the lost-return lost circulation equivalent density is generally calculated by using circulating standing pressure before loss, the calculation of the leaking stoppage slurry density is directly influenced by the value accuracy of the circulating standing pressure, and the leaking stoppage slurry density is improperly designed, so that the loss occurs at the bottom of a well or a certain weak stratum or the repeated loss occurs at a blocked position.
Disclosure of Invention
Aiming at the problems, the invention provides a method for calculating the equivalent density of lost-return lost circulation, which aims to solve the problem that the equivalent density is quickly calculated when lost-return loss occurs and shorten the time and risk of plugging operation.
In order to achieve the purpose, the invention provides the following technical scheme:
a. calculating the pressure gradient of the slurry structural force according to the slurry dynamic shear force
Figure BDA0002152577430000021
Figure BDA0002152577430000022
Wherein: tau. y Represents the dynamic shear force of the slurry, pa;
D h represents the average borehole diameter of an open hole section, mm;
D P represents the outer diameter of a casing or a drilling tool, mm;
b. pressure gradient according to equation (1)
Figure BDA0002152577430000023
To calculate the pressure P of the mud structure force increasing at the bottom of the well or at the weak layer Increase the ；
Figure BDA0002152577430000024
Wherein: p is Increase Represents the increased pressure of the well bottom or weak zone, MPa;
Figure BDA0002152577430000025
represents a pressure gradient, kPa/m;
h represents the bottom of the wellOr weak layerDepth, m;
c. according to the formula (2) P Increase Calculating the final pressure P of the well bottom or weak layer;
P＝P increase +0.001×ρgH (3)；
Wherein: p represents the final pressure of the well bottom or weak layer, MPa;
P increase Represents the increased pressure of the well bottom or weak zone, MPa;
rho represents the mud density, g/cm 3 ；
g represents dimension, 9.8N/kg;
h represents the depth of the well bottom or weak layer, m;
d. calculating the equivalent density rho when the lost return leakage of the well bottom or the weak layer occurs according to the formula (3) P Medicine for treating hepatitis ；
Figure BDA0002152577430000031
Where ρ is Medicine for treating hepatitis The equivalent density in g/cm when the loss of return property of the well bottom or weak layer occurs 3 ；
P represents the final pressure required at the bottom of the well or at the weak zone, MPa;
g represents dimension, 9.8N/kg;
h represents the depth of the well bottom or weak layer, m.
Further, according to the calculated loss return loss time equivalent density rho Medicine for treating chronic hepatitis B To prepare plugging slurry.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of quickly calculating the equivalent density of a well bottom or a weak layer from the dynamic shear force angle of drilling fluid, calculating to obtain a pressure gradient corresponding to the mud structural force according to a formula (1), then calculating the pressure of the well bottom or the weak layer increased by the mud structural force according to a formula (2), then calculating the final pressure of the well bottom or the weak layer according to a formula (3), and then calculating the equivalent density corresponding to the well bottom or the weak layer according to a formula (4). The new calculation idea is considered from drilling fluid dynamic shear, the defect of vertical pressure selection in the drilling process in the conventional lost-return leakage equivalent calculation is overcome, the lost-return leakage equivalent is calculated quickly, the leakage plugging time is shortened, and the operation risk is reduced.
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FIG. 1 is a schematic flow chart of the implementation of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples, but the present invention is not limited to these embodiments, and the examples are only illustrative. While the advantages of the invention will be apparent and readily appreciated by the description.
As shown in fig. 1, a method for calculating lost circulation equivalent density includes the following steps:
a. calculating the pressure gradient of the slurry structural force according to the slurry dynamic shear force
Figure BDA0002152577430000041
Figure BDA0002152577430000042
Wherein: tau is y Representing the dynamic shear force of the slurry, pa;
D h represents the average borehole diameter of an open hole section, mm;
D P represents the outer diameter of a casing or a drilling tool, mm;
b. according to formula (1)Pressure gradient
Figure BDA0002152577430000043
To calculate the pressure P of the bottom hole or weak zone increase Increase ；
Figure BDA0002152577430000044
Wherein: p Increase Represents the increased pressure of the well bottom or weak zone, MPa;
Figure BDA0002152577430000045
represents the pressure gradient, kPa/m;
h represents the depth of the well bottom or weak layer, m;
c. according to formula (2) P Increase Calculating the final pressure P of the well bottom or weak layer;
P＝P increase +0.001×ρgH (3)；
Wherein: p represents the final pressure of the well bottom or weak zone, MPa;
P increase the Represents the increased pressure of the well bottom or weak zone, MPa;
rho represents the mud density, g/cm 3 ；
g represents dimension, 9.8N/kg;
h represents the depth of the well bottom or weak layer, m;
d. calculating the equivalent density rho when the bottom hole or the weak layer is lost and returns and is lost according to the formula (3) P Medicine for treating chronic hepatitis B ；
Figure BDA0002152577430000051
Where ρ is Medicine for treating chronic hepatitis B The equivalent density in g/cm when the loss of return property of the well bottom or weak layer occurs 3 ；
P represents the final pressure of the well bottom or weak zone, MPa;
g represents dimension, 9.8N/kg;
h represents the depth of the bottom hole or weak layer, m.
And (4) calculating the equivalent density when the lost-return leakage of the well bottom or the weak layer occurs according to the formula (4).
Example 1:
the well completion depth of a certain well is 2956m, and the drilling completion slurry density is 2.27g/cm 3 Average hole diameter 319.48mm, the diameter of a lower 9-5/8' casing pipe is 2955.60m, the inner volume of the casing pipe is 36.04L/m, and after slurry is filled, a circulating head is connected and a pump is started. Using 0.18m 3 After the small displacement per minute is pushed through, the displacement is increased to 0.6m 3 And/min, and suddenly finding mud loss after 1 hour of circulation. The slurry properties are: density: 2.27g/cm 3 Viscosity: 58s, water loss: 4.0mL, mud cake: 0.5mm, sand content: 0.2%, pH: initial cutting/final cutting: 5 Pa/10 Pa, six speed: 5/8/48/79/106/200, plastic adhesion: 88Pa, dynamic cutting: 12Pa.
The design method is adopted to calculate the equivalent density when the well bottom lost return loss occurs, and the process is as follows:
a. calculating the pressure gradient corresponding to the slurry structural force according to the slurry dynamic shear force
Figure BDA0002152577430000052
Figure BDA0002152577430000053
Wherein: tau is y Representing the dynamic shear force of the slurry, pa;
D h represents the average hole diameter of an open hole section, mm;
D P represents the outer diameter of a casing or a drilling tool, mm;
b. substituting the pressure gradient value of 0.16KPa/m calculated by the formula (1) into the formula (2) to calculate the increased pressure P of the well bottom or the weak layer Increase ；
Figure BDA0002152577430000061
Wherein: p Increase the Represents the increased pressure of the well bottom or weak zone, MPa;
Figure BDA0002152577430000062
represents a pressure gradient, kPa/m;
h represents the depth of the well bottom or weak layer, m;
c. calculating P from formula (2) Increase Substituting the value of 0.47MPa into the formula (3) to calculate the final pressure P of the well bottom or the weak layer;
P＝P increase +0.001×ρgH (3)；
Wherein: p represents the final pressure of the well bottom or weak layer, MPa;
P increase the Represents increased pressure, mpa, at the bottom of the well or at the weakened zone;
rho represents the mud density, g/cm 3 ；
g represents dimension, 9.8N/kg;
h represents the depth of the well bottom or weak layer, m;
d. substituting the P value calculated by the formula (3) of 66.32MPa into the formula (4) to calculate the equivalent density when the bottom hole or the weak layer is lost;
Figure BDA0002152577430000063
where ρ is Medicine for treating chronic hepatitis B The equivalent density of the well bottom or weak layer when loss return loss occurs is represented as g/cm 3 ；
P represents the final pressure of the well bottom or weak layer, MPa;
g represents dimension, 9.8N/kg;
h represents the depth of the well bottom or weak layer, m;
calculating the equivalent density of 2.29g/cm when the lost return leakage occurs at the bottom of the well according to the formula (4) 3 。
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.

Claims (2)

1. A lost circulation equivalent density calculation method is characterized by comprising the following steps:
a. according to mudCalculating pressure gradient of slurry structural force by using slurry dynamic shear force
Figure FDA0002152577420000011
Figure FDA0002152577420000012
Wherein: tau is y Representing the dynamic shear force of the slurry, pa;
D h represents the average hole diameter of an open hole section, mm;
D P represents the outer diameter of a casing or a drilling tool, mm;
b. pressure gradient according to equation (1)
Figure FDA0002152577420000013
To calculate the pressure P of the mud structure force increasing at the bottom of the well or at the weak layer Increase ；
Figure FDA0002152577420000014
Wherein: p is Increase Represents the increased pressure of the well bottom or weak zone, MPa;
Figure FDA0002152577420000015
represents a pressure gradient, kPa/m;
h represents the depth of the well bottom or weak layer, m;
c. according to the formula (2) P Increase Calculating the final pressure P of the well bottom or weak layer;
P＝P increase +0.001×ρgH (3)；
Wherein: p represents the final pressure of the well bottom or weak layer, MPa;
P increase Represents an increased pressure, MPa, of the well bottom or weak zone;
rho represents the mud density, g/cm 3 ；
g represents dimension, 9.8N/kg;
h represents the depth of the well bottom or weak layer, m;
d. calculating the equivalent density rho when the bottom hole or the weak layer is lost and returns and is lost according to the formula (3) P Medicine for treating chronic hepatitis B ；
Figure FDA0002152577420000021
Where ρ is Medicine for treating chronic hepatitis B The equivalent density in g/cm when the loss of return property of the well bottom or weak layer occurs 3 ；
P represents the final pressure of the well bottom or weak layer, MPa;
g represents dimension, 9.8N/kg;
h represents the depth of the well bottom or weak layer, m.
2. The method for calculating lost circulation equivalent density of claim 1, wherein the method comprises the following steps: according to the calculated loss return loss time equivalent density rho Medicine for treating hepatitis To prepare plugging slurry.
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CN111395965B (en) * 2020-03-23 2022-03-01 中国石油天然气集团有限公司 Safe casing running operation method suitable for easily-leaking stratum
CN111738620B (en) * 2020-07-17 2020-12-25 西南石油大学 Well leakage risk prediction and leakage stoppage decision system and method based on association rules

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2061835C1 (en) * 1994-04-12 1996-06-10 "Кубаньгазпром" Method for control over drilling well shaft with intensive deflection
US6668943B1 (en) * 1999-06-03 2003-12-30 Exxonmobil Upstream Research Company Method and apparatus for controlling pressure and detecting well control problems during drilling of an offshore well using a gas-lifted riser
CN105114031A (en) * 2015-08-27 2015-12-02 长江大学 Method and system for controlling well cementation pressure on account of U-shaped pipe effect
CN105443072A (en) * 2015-12-09 2016-03-30 中国石油化工股份有限公司 Horizontal well oil-string casing well cementation method
CN106150489A (en) * 2016-07-26 2016-11-23 中石化石油工程技术服务有限公司 A kind of Formation bearing pressure dynamic testing method and cementing method
CN106285646A (en) * 2016-09-09 2017-01-04 中国石油大学(华东) Drilling well loss horizon recognition methods based on Multi-information acquisition
CN108240196A (en) * 2017-12-15 2018-07-03 中国石油集团川庆钻探工程有限公司 The drilling liner cementing method of control pressure sensibility stratum annular equivalent density
CN108708711A (en) * 2018-05-25 2018-10-26 贵州省非常规天然气勘探开发利用工程研究中心有限公司 A kind of method of accurate determining loss horizon
CN108868687A (en) * 2017-05-15 2018-11-23 中国石油化工股份有限公司 A kind of method of leak-proof leak-stopping
CN109403957A (en) * 2017-08-16 2019-03-01 中国石油化工股份有限公司 A kind of high pressure formation pressure acquisition methods

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6904981B2 (en) * 2002-02-20 2005-06-14 Shell Oil Company Dynamic annular pressure control apparatus and method

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2061835C1 (en) * 1994-04-12 1996-06-10 "Кубаньгазпром" Method for control over drilling well shaft with intensive deflection
US6668943B1 (en) * 1999-06-03 2003-12-30 Exxonmobil Upstream Research Company Method and apparatus for controlling pressure and detecting well control problems during drilling of an offshore well using a gas-lifted riser
CN105114031A (en) * 2015-08-27 2015-12-02 长江大学 Method and system for controlling well cementation pressure on account of U-shaped pipe effect
CN105443072A (en) * 2015-12-09 2016-03-30 中国石油化工股份有限公司 Horizontal well oil-string casing well cementation method
CN106150489A (en) * 2016-07-26 2016-11-23 中石化石油工程技术服务有限公司 A kind of Formation bearing pressure dynamic testing method and cementing method
CN106285646A (en) * 2016-09-09 2017-01-04 中国石油大学(华东) Drilling well loss horizon recognition methods based on Multi-information acquisition
CN108868687A (en) * 2017-05-15 2018-11-23 中国石油化工股份有限公司 A kind of method of leak-proof leak-stopping
CN109403957A (en) * 2017-08-16 2019-03-01 中国石油化工股份有限公司 A kind of high pressure formation pressure acquisition methods
CN108240196A (en) * 2017-12-15 2018-07-03 中国石油集团川庆钻探工程有限公司 The drilling liner cementing method of control pressure sensibility stratum annular equivalent density
CN108708711A (en) * 2018-05-25 2018-10-26 贵州省非常规天然气勘探开发利用工程研究中心有限公司 A kind of method of accurate determining loss horizon

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
"A new approach to risk control of gas kick in high-pressure sour gas wells";Hu YinPu;《Journal of Natural Gas Science and Engineering》;20150930;第26卷;全文 *
"吉林油田临参1井防漏堵漏技术研究";宋立甲;《中国优秀硕士论文全文库工程科技I辑》;20160415(第4期);全文 *
"天然裂缝性地层钻井液漏失规律研究";李大奇;《西南石油大学学报(自然科学版)》;20160527;第38卷(第3期);全文 *
"承压剂在枣园区块防漏堵漏的研究与应用";杨连春;《中国优秀硕士论文全文库工程科技I辑》;20120415(第4期);全文 *
"泥浆帽控压钻井技术研究";王泽东;《中国优秀硕士论文全文库工程科技I辑》;20150215(第2期);全文 *
"深水钻井司钻法压井过程中立管压力和地层受力变化规律";张艳，翟晓鹏;《石油钻采工艺》;20150930;第37卷(第5期);全文 *
"精细控压钻井井筒压力控制技术研究";张奎林;《中国优秀博士论文全文库工程科技I辑》;20130915(第9期);全文 *

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