CN115405254A - Foam cement leakage stopping method - Google Patents
Foam cement leakage stopping method Download PDFInfo
- Publication number
- CN115405254A CN115405254A CN202210950732.1A CN202210950732A CN115405254A CN 115405254 A CN115405254 A CN 115405254A CN 202210950732 A CN202210950732 A CN 202210950732A CN 115405254 A CN115405254 A CN 115405254A
- Authority
- CN
- China
- Prior art keywords
- cement
- well
- leakage
- foam cement
- foam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004568 cement Substances 0.000 title claims abstract description 98
- 239000006260 foam Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005553 drilling Methods 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 10
- 238000010276 construction Methods 0.000 claims abstract description 7
- 238000010408 sweeping Methods 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000004094 surface-active agent Substances 0.000 claims description 7
- 238000005187 foaming Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 235000019794 sodium silicate Nutrition 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a foam cement leakage stoppage method, which solves the problems of high leakage rate and easy leakage recovery of the traditional cement leakage stoppage. The method comprises the following steps: the drilling tool is lowered to the bottom of the well, and positive injection leaking stoppage slurry is injected for 10-20m 3 (ii) a Positive injecting a borehole volume of foamed cement downhole; after the positive injection is finished, quickly lifting the drilling tool to a wellhead, and closing the well sealer to perform back extrusion cement construction; and (4) extruding the foam cement with the volume of the well bore, drilling down to sweep the plug, and sweeping the plug to the well bottom without leakage, so that the plugging is successful. The method has the advantages of low cost, simple operation, low column pressure, strong compressibility, good cement plasticity, high displacement efficiency and high success rate of leaking stoppage.
Description
Technical Field
The invention relates to the technical field of drilling in the petroleum drilling industry, in particular to a leaking stoppage method applied to well leakage in the drilling process.
Background
Lost-return leakage often occurs during drilling due to the formation having vugs, fractures or connections to the groundwater system. For lost-return leakage, the conventional plugging material has small particles, cannot effectively plug a leakage layer, even if plugging succeeds, has low strength and is easy to leak again. The commonly used common cement slurry for plugging has the following problems: (1) The cement paste has high density, high liquid column pressure and low stratum bearing capacity, so that cement is easily leaked from a crack karst cave and a water system, and an effective cement plug cannot be formed. (2) The conventional cement is injected, the drill rod is required to be lowered to the position near the leaking layer, the leaking layer is often near the underground liquid level and is difficult to observe, the drill rod cannot be ensured to be accurately aligned with the leaking layer, and cement slurry cannot be accurately injected into the leaking layer, so that the leaking stoppage construction failure is easily caused; (3) The strength of the conventional cement is reduced after the conventional cement is mixed with well fluid, and the secondary leakage is easily caused.
Disclosure of Invention
The invention aims to solve the technical problems and provides a foam cement leakage plugging method which is low in cost, simple to operate, low in column pressure, strong in compressibility, good in cement plasticity, high in displacement efficiency and high in leakage plugging success rate.
The method comprises the following steps:
1) The drilling tool is lowered to the bottom of the well, and positive injection leaking stoppage slurry is injected for 10-20m 3 ；
2) Positive injecting a borehole volume of foamed cement downhole;
3) After the positive injection is finished, quickly lifting the drilling tool to a wellhead, and closing the well sealer to perform back extrusion cement construction;
4) And (4) extruding the foam cement with the volume of the well bore, drilling down to sweep the plug, and sweeping the plug to the well bottom without leakage, so that the plugging is successful.
The foam cement in the step 2) is conventional foam cement, and the preparation method comprises the following steps: 0.70-0.80g/cm prepared by mixing surfactant into conventional cement and charging nitrogen to name cement for foaming 3 Low density cement slurry.
In the step 2), the condition of wellhead slurry return is concerned in the positive injection process, and if slurry returns out, the grouting is immediately stopped, and the drilling tool is quickly lifted to the wellhead.
The foam cement in the step 4) is dual-quick foam cement, and the preparation method comprises the following steps: 0.70-0.80g/cm prepared by mixing surfactant into double-speed cement and charging nitrogen to name cement foaming 3 Low density cement slurry.
And in the step 4), if the wellhead pressure is continuously increased in the back extrusion process, the back extrusion operation is stopped.
In the method of the invention, the conventional cement is commercially available with the density of 1.50-1.90g/cm 3 Ordinary cement; the double-quick cement is a cement which is purchased from the market and has the characteristics of quick setting and hardening and high hourly strength, namely the so-called 'hourly cement'. The surfactant may be calcium chloride, potassium chloride, soda ash, salt, sodium silicate, or the like, and is preferably added in an amount of 1% to 3% by mass of the cement.
Has the advantages that:
the foamed cement is adopted to replace the conventional cement, and the density is 1.50-1.90g/cm compared with the conventional cement 3 The density of the foam cement slurry is low, and the pressure of a shaft liquid column can be effectively reduced; the foam slurry has poor fluidity and is easy to leakThe layer is resident, and the optimized use of the quick-setting cement has short initial setting time, and is continuously accumulated and filled at a leakage point after initial setting, so that a cement zone is formed near a leakage zone to plug a stratum crack, and the aim of plugging is fulfilled. The method of the invention firstly positively injects the plugging slurry to reduce the leakage rate aiming at the characteristics of the foam cement, then positively injects the conventional foam cement to form the set cement in the leakage layer, finally reversely extrudes the double-fast foam cement in the volume of the well hole to further improve the strength of the set cement, and realizes effective plugging after the coagulation. The method is extremely simple, the raw materials are easy to obtain, the use amount of the plugging slurry is effectively reduced, the production cost is low, the treatment period is short, the plugging success rate is high, and the method plays an important role in the well leakage in the drilling process.
Detailed Description
In the following examples, the preparation method of the conventional foam cement is as follows: 0.70-0.80g/cm prepared by mixing surfactant into conventional cement and charging nitrogen to name cement for foaming 3 Low density cement slurry. In the embodiment, the conventional cement is purchased from Jiahua and marked with grade G, the setting time of the cement is 240-300 min, and the density of the cement paste is 1.50-1.90G/cm 3 ；
The preparation method of the dual-quick foam cement comprises the following steps: 0.70-0.80g/cm prepared by mixing surfactant into double-speed cement and charging nitrogen to name cement foaming 3 Low density cement slurry. In the embodiment, the quick setting cement is purchased from Jiahua cement marked as grade G, the setting time of the cement is 60-150 min by adding the coagulant, and the cement paste density is 1.50-1.80G/cm 3 The double fast cement of (1).
The specific method comprises the following steps:
(1) the drilling tool is lowered to the bottom of the well, and positive injection leaking stoppage slurry is injected for 10-20m 3 Mainly reduces the leakage rate and provides guarantee for the effective residence of the foam cement.
(2) A volume of conventional foam cement is injected downhole into the wellbore in order for the cement to enter the thief zone, forming set cement in the thief zone. And paying attention to the well mouth slurry return condition in the positive injection process, stopping grouting immediately if slurry returns, and quickly lifting the drilling tool to the well mouth.
(3) In order to prevent 'flag inserting rod' caused by early solidification of cement, a drilling tool needs to be quickly lifted to a wellhead, and a well sealer needs to be closed to perform back extrusion cement construction.
(4) And (3) backward extruding the double-quick foam cement with the volume of the borehole of the well, so as to extrude the cement into a leaking layer and improve the strength of cement stones, and if the pressure of a well mouth continuously rises in the backward extrusion process, the backward extrusion operation is stopped.
(5) After the foam cement is used for plugging, after waiting for setting for 24 hours, drilling down and sweeping the plug, and if no leakage occurs when the plug is swept to the bottom of the well, the plugging is successful.
The application case is as follows: application case of focal-plane 18-4HF well
1. Base case geographic location: 2 groups of construction positions of stone wall town western-style collection warehouse in Nanchuan area of Chongqing: sichuan-Dong high and steep fold with Wanxian county multidirectional syncline Dong Sheng Beiqi well classification: developing a well; well type: designing the well depth of the horizontal well: 6058m; the horizontal section is long: 1800m; altitude 753.1m
Finishing drilling a layer: wufeng-Longmaxigang Yingyi (1) upper (3) lower small layer
Winning page 18-4HF well structure design data
And (4) drilling in 2022, 3 months and 10 days, wherein the drilling time is 30 seconds.
2. The construction process comprises the following steps:
(1) drilling down to 790m, and injecting leakage-blocking slurry to 20m 3 Normal injection cement slurry (conventional foam cement) 94m 3 The density of the cement paste is 1.85g/cm 3 (density after nitrogen charging is 0.7-0.8g/cm 3 )；
(2) Snatching the drilling tool out of the well;
(3) connecting double drill rods to the well mouth, closing the well and reversely squeezing cement paste (double-quick foam cement) 88m 3 The density of the cement paste is 1.75-1.85g/cm 3 (Density to 0.8g/cm after Nitrogen charging) 3 )；
(4) And (3) closing the well, keeping the pressure, waiting for setting for 24 hours, putting a drilling plug, plugging the surface of the plug by 50m, adopting 1-2 tons of drilling pressure, and plugging the plug by to the well depth of 861m, wherein no leakage occurs, and the plugging is successful.
So far, the method of the invention has been adopted to carry out 5 times of plugging in the Wiegmann field and the Fuling shale gas field, the success rate is 80 percent, and only 1 well has the condition of repeated leakage.
Claims (5)
1. The foam cement leakage stoppage method is characterized by comprising the following steps:
1) The drilling tool is lowered to the bottom of the well, and positive injection leaking stoppage slurry is injected for 10-20m 3 ；
2) Positive injecting a borehole volume of foamed cement downhole;
3) After the positive injection is finished, quickly lifting the drilling tool to a wellhead, and closing the well sealer to perform back extrusion cement construction;
4) And (4) extruding the foam cement with the volume of the well bore, drilling down to sweep the plug, and sweeping the plug to the well bottom without leakage, so that the plugging is successful.
2. The foam cement plugging method according to claim 1, wherein the foam cement in the step 2) is a conventional foam cement, and the preparation method comprises the following steps: 0.70-0.80g/cm prepared by mixing surfactant into conventional cement and charging nitrogen to name cement for foaming 3 Low density cement slurry.
3. The foam cement leakage stoppage method as recited in claim 1 or 2, wherein in the step 2), the wellhead slurry return situation is concerned in the positive injection process, and if slurry returns, the grouting is stopped immediately, and the drilling tool is lifted to the wellhead quickly.
4. The foam cement leakage stoppage method as claimed in claim 1, wherein the foam cement in the step 4) is a dual-rapid foam cement, and the preparation method thereof comprises: 0.70-0.80g/cm prepared by mixing surfactant into double-speed cement and filling nitrogen to name cement foaming 3 Low density cement slurry.
5. The foam cement leakage stoppage method as recited in claim 1 or 4, wherein the back-extrusion operation is stopped if the wellhead pressure is continuously increased during the back-extrusion in the step 4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210950732.1A CN115405254A (en) | 2022-08-09 | 2022-08-09 | Foam cement leakage stopping method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210950732.1A CN115405254A (en) | 2022-08-09 | 2022-08-09 | Foam cement leakage stopping method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115405254A true CN115405254A (en) | 2022-11-29 |
Family
ID=84159283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210950732.1A Pending CN115405254A (en) | 2022-08-09 | 2022-08-09 | Foam cement leakage stopping method |
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| Country | Link |
|---|---|
| CN (1) | CN115405254A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525387A (en) * | 2013-09-29 | 2014-01-22 | 中国石油大学(华东) | Foam cement slurry system and composition |
| CN106555565A (en) * | 2016-11-30 | 2017-04-05 | 中石化石油工程技术服务有限公司 | A kind of low pressure and easy leaking loses the cementing method that well positive injection is instead squeezed |
| CN107035338A (en) * | 2017-05-12 | 2017-08-11 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Annular space is counter notes backward extrusion blocking method for a kind of fine sand leak stopping slurry |
-
2022
- 2022-08-09 CN CN202210950732.1A patent/CN115405254A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525387A (en) * | 2013-09-29 | 2014-01-22 | 中国石油大学(华东) | Foam cement slurry system and composition |
| CN106555565A (en) * | 2016-11-30 | 2017-04-05 | 中石化石油工程技术服务有限公司 | A kind of low pressure and easy leaking loses the cementing method that well positive injection is instead squeezed |
| CN107035338A (en) * | 2017-05-12 | 2017-08-11 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Annular space is counter notes backward extrusion blocking method for a kind of fine sand leak stopping slurry |
Non-Patent Citations (5)
| Title |
|---|
| 匡立新等: "涪陵平桥南区块页岩气水平井钻井提速潜力分析", 《石油钻探技术》, vol. 46, no. 4, pages 16 - 22 * |
| 李明忠;蒋新立;李德红;刘福;李季;: "泡沫固井水泥浆密度与环空液柱压力变化规律研究", 《探矿工程(岩土钻掘工程)》, vol. 44, no. 11, pages 30 - 34 * |
| 王建云等: "顺北油气田低压易漏层泡沫水泥浆固井技术", 《石油钻探技术》, vol. 50, no. 4, pages 25 - 30 * |
| 罗渠华;: "涪陵区块智能快堵水泥现场应用", 江汉石油科技, no. 02, pages 61 - 62 * |
| 胡小奎;王建斌;: "浅析焦页17-3HF井一开长兴组喷漏同层钻井技术", 《中国石油石化》, no. 2, pages 18 - 19 * |
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