JPH0368997B2 - - Google Patents
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- Publication number
- JPH0368997B2 JPH0368997B2 JP59018877A JP1887784A JPH0368997B2 JP H0368997 B2 JPH0368997 B2 JP H0368997B2 JP 59018877 A JP59018877 A JP 59018877A JP 1887784 A JP1887784 A JP 1887784A JP H0368997 B2 JPH0368997 B2 JP H0368997B2
- Authority
- JP
- Japan
- Prior art keywords
- mud
- water
- cement
- sludge
- present
- 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.)
- Expired - Lifetime
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Treatment Of Sludge (AREA)
Description
本発明は坑井泥水掘削工法における逸泥防止方
法に関するものである。
石油、天然ガス又は鉱山における探鉱などで行
なわれるボーリング（以下掘削という）にはベン
トナイト、水溶性高分子、分散剤、及び潤滑剤、
その他必要に応じた添加剤などを組み合わせた水
溶媒の懸濁流体（以下泥水という）を用いる泥水
工法が使用されている。
かかる坑井泥水掘削工法における泥水の効果は
掘削土砂の地質への搬出、ビツト及びドリルカラ
ーなどの冷却、さらには掘削坑壁の保護、高圧層
における油、ガス又は水などの噴出防止などの機
能がある。しかし掘削に際して破壊地層やボーラ
スな地層に遭遇した場合に、泥水が地層内に逃げ
る逸泥現象なる事故がおこる。この逸泥が起るこ
とによつて坑内障害を併発して掘削工事の進行を
妨げることが多い。このような逸泥にはいろいろ
なタイプがあるが、その逸泥に程度によつて次の
３段階に分けることができる。
(1) 小逸泥−逸泥層で少量ずつ逸泥があるが、泥
水の循環が充分できる。
(2) 中逸泥−逸泥層において逸泥現象が顕著で、
少量の泥水のみが循環でき大部分が逸泥する。
(3) 大逸泥−逸泥層で逸泥現象が起り、泥水が完
全に循環しなくなる。
このような逸泥の程度によつて、その防止対策
は異なつた方法がとられる。又この逸泥対策の成
功、不成功によつて掘削期間の短縮や掘削コスト
の低減などに重大な影響をおよぼすことになる。
この逸泥対策には従来からいろいろな方法がとら
れている。例えば小逸泥に対しては泥水中にクル
ミ殻、雲母片、フアイバー物質や綿実油しぼり滓
などの逸泥防止剤を泥水中に添加して逸泥層の割
れ目や間隙を閉塞する方法によつて効果を上げる
ことができる。
これに対して中以上の逸泥に対してはセメント
フラツシユやセメントスキーズなどの方法がとれ
らるが、これらの場合にも、この逸脱の規模に応
じてある粒径を有する逸泥防止剤を添加しなけば
ならない。又セメントフラツシユやセメントスキ
ーズなどに用いるセメントスラリーは比重が高
く、さらに水中に分散し易いために地層水を多く
含む逸泥層などにおいては地層中に逃げてしまつ
たり、又逸泥した泥水と混合したりして逸泥地層
内で固化せずに再掘削時に再び逸泥を起す結果と
なる。本発明者らは坑井泥水掘削工法に於けるこ
れらの逸泥を防止する方法について鋭意検討した
結果、本発明を完成するに到つたのである。
即ち本発明の逸泥防止方法は坑井泥水掘削工法
の際、逸泥を予想される地層に水溶性高分子を配
合したセメントスラリーを注入し、逸泥層に浸透
固化させることにより逸泥を防止するものであ
る。
本発明に用いる水溶性高分子としては、各種の
セルロースエーテル類、例えばメチルセルロー
ス、カルボキシメチルセルロース、ヒドロキシエ
チルセルロース、ヒドロキシプロピルセルロー
ス、ヒドロキシプロピルメチルセルロース、カル
ボキシメチルヒドロキシエチルセルロース等が使
用出来、又合成水溶性高分子としては、ポリエチ
レンオキシド、ポリアクリルアミド、ポリアクリ
ル酸ソーダ、ポリビニルアルコール、ポリエチレ
ンイミン等がある。このほかデンプン及びその誘
導体、アルギン酸ソーダ、カラギーナン、グアガ
ム、ローカストビーンガム等の天然高分子も適用
され得る。又これらの水溶性高分子は単独もしく
は２種以上を併用することも可能である。
又本発明のセメントスラリーには、普通ボルト
ランドセメント、中庸熱ボルトランドセメント、
高炉セメントをはじめとする各種の水硬性セメン
トを用いることができる。
本発明におけるセメントスラリー組成は、セメ
ント100重量部に対し、１％水溶液粘度が50〜
5000センチポイズ（cps）の水溶性高分子を0.05
〜5.0重量部と、水／セメント比＝0.3〜0.8に相当
する水を配合したものが適当である。
本発明のセメントスラリーにおける水溶性高分
子の添加による効果は、セメントスラリーに適当
な粘性を与えてスラリーが地下水や泥水中へ拡散
するのを防ぐものであると推定される。すなわち
本発明のスラリーは逸脱地層の開口部（割れ目、
ボーラス地層）から地層内に浸透し、地層内の地
下水や泥水へ拡散し難いため、稀釈されることな
く逸泥層内で固化し逸泥孔隙を閉塞し逸泥を防止
するものであると推定される。
本発明の実施に当つて、水溶性高分子の１％水
溶液粘度が50cps以下のものでは、拡散を防止す
るのに十分なセメントスラリーの粘性が得られ
ず、5000cps以上のものでは逆にセメントスラリ
ーの粘性が大きくなりすぎて、流動性に欠け逸泥
地層に浸透しにくくなる。従つて１％水溶液粘度
が50〜5000cpsの水溶性高分子を使用するのが望
ましい。同様に水溶性高分子の配合量はセメント
100重量部に対して0.05〜5.0重量部の範囲が望ま
しく、0.05重量部より少ない場合は十分な粘性が
得られず、5.0重量部を越える場合は粘性が大き
くなり過ぎて、本発明の目的が十分達せられない
恐れがある。
本発明の実施に当つては、泥水掘削に際して逸
泥を予想される地層に遭遇した場合、まず水溶性
高分子を配合したセメントスラリーをこの逸泥層
の下部からドリルパイプを用いて掘削坑内に充填
し、重力により又は加圧することによつて逸泥層
内に浸透せしめ、静置して逸泥層内で固化させて
逸泥孔隙を閉塞せしめる。しかる後、再び泥水を
用いて掘削を続ければよい。
また、本発明に於て使用するセメントスラリー
に、アスベスト、マイカ、ベントナイトなどの鉱
物性繊維、粉末または粒状物もしくは植物性繊
維、粉末または粒状物などを混入することも効果
的であり、必要に応じて凝結促進剤、凝結遅延
剤、流動化剤、減水剤などの添加剤を配合しても
よい。
以下実施例を以つて本発明を説明するが、これ
らの実施例は本発明を何ら限定するものではな
い。
実施例 １
表１に記載の４種の粒径を有するガラス球をそ
れぞれの円筒に詰めてモデル逸泥層を作成し、モ
デル逸泥層の空隙を水で充填して次の試験を行つ
た。
(1) 循環泥水を重力で注入し、逸泥量を測定し
た。
(2) 水溶性高分子を配合しない通常のセメントス
ラリー（水／セメント比＝0.5）を、１Kg／cm2
の圧力で加圧注入し、モデル逸泥層に十分に浸
透せしめた後２時間静置した。その後、循環泥
水を重力注入および0.5、１、３、７Kg／cm2の
圧力で加圧圧入し、30分後の逸泥量を測定し
た。
(3) １％水溶液の粘度が、1200cpsのヒドロキシ
エチルセルロースを、セメント100重量部に対
し１重量部配合した本発明のセメントスラリー
（水／セメント比＝0.5）を１Kg／cm2の圧力で加
圧注入し、モデル逸泥層に十分に浸透せしめた
後、２時間静置した。その後、循環泥水を重力
注入および0.5、１、３、７Kg／cm2で加圧注入
し、30分後の逸泥量を測定した。
以上の試験結果を表１に示す。表の結果より本
発明のセメントスラリーを用いた場合の逸泥防止
効果が顕著であることがわかる。
The present invention relates to a method for preventing lost mud in a well mud drilling method. Boring (hereinafter referred to as drilling) carried out in oil, natural gas or mine exploration requires bentonite, water-soluble polymers, dispersants, lubricants,
A muddy water construction method is also used that uses a suspension fluid of water solvent (hereinafter referred to as muddy water) combined with other additives as necessary. The effects of mud in this well mud drilling method include transporting excavated soil to the geological formations, cooling bits and drill collars, protecting the walls of the drilled hole, and preventing oil, gas, water, etc. from blowing out in high-pressure layers. There is. However, when a fractured or bolus stratum is encountered during excavation, an accident known as mud slipping occurs, where muddy water escapes into the stratum. This slippage often causes underground failures and impedes the progress of excavation work. There are various types of such lost mud, but they can be divided into the following three stages depending on the degree of lost mud. (1) There is a small amount of sludge in the small sludge layer, but the circulation of mud is sufficient. (2) The tsudo phenomenon is remarkable in the middle tsudo-itsudo layer;
Only a small amount of muddy water can circulate and most of it is lost. (3) Great mud mud - The mud mud phenomenon occurs in the mud mud layer, and the muddy water does not circulate completely. Depending on the degree of such slippage, different methods are taken to prevent it. Furthermore, the success or failure of these sludge countermeasures will have a significant impact on shortening the excavation period and reducing excavation costs.
Various methods have been used to prevent this loss of waste. For example, for small sludge, a method of adding sludge preventive agents such as walnut shells, mica pieces, fiber substances, and cottonseed oil slag to the muddy water to close the cracks and gaps in the sludge layer. You can increase the effect. On the other hand, methods such as cement flushing and cement squeezing can be used for medium or larger sludge slippage, but even in these cases, a sludge prevention method with a certain particle size depending on the scale of this deviation is used. agent must be added. In addition, cement slurry used for cement flats and cement skies has a high specific gravity and is easily dispersed in water, so it may escape into the stratum or be absorbed into the sludge layer, which contains a lot of formation water. It mixes with mud water and does not solidify within the mud stratum, resulting in mud slipping again when re-excavation is carried out. The inventors of the present invention have completed the present invention as a result of intensive study on a method for preventing mud slippage in well mud drilling methods. In other words, the method for preventing sludge of the present invention is to prevent sludge by injecting a cement slurry containing a water-soluble polymer into the stratum where sludge is expected to sludge during well mud excavation method, and allowing it to permeate and solidify into the sludge layer. It is intended to prevent As the water-soluble polymer used in the present invention, various cellulose ethers such as methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carboxymethylhydroxyethylcellulose, etc. can be used, and as a synthetic water-soluble polymer, Examples include polyethylene oxide, polyacrylamide, sodium polyacrylate, polyvinyl alcohol, and polyethyleneimine. In addition, natural polymers such as starch and its derivatives, sodium alginate, carrageenan, guar gum, and locust bean gum can also be applied. Further, these water-soluble polymers can be used alone or in combination of two or more. Further, the cement slurry of the present invention includes ordinary boltland cement, moderate heat boltland cement,
Various hydraulic cements including blast furnace cement can be used. The cement slurry composition in the present invention has a 1% aqueous solution viscosity of 50 to 100 parts by weight of cement.
0.05 5000 centipoise (cps) water-soluble polymer
A suitable blend is ~5.0 parts by weight and water corresponding to a water/cement ratio of 0.3 to 0.8. It is presumed that the effect of adding a water-soluble polymer to the cement slurry of the present invention is to impart appropriate viscosity to the cement slurry and prevent the slurry from dispersing into groundwater or muddy water. That is, the slurry of the present invention can be applied to openings (cracks,
It is estimated that it penetrates into the stratum from the bolas stratum and is difficult to diffuse into the groundwater and mud within the stratum, so it solidifies within the sludge layer without being diluted, blocking the sludge pores and preventing sludge. be done. In implementing the present invention, if the viscosity of a 1% aqueous solution of water-soluble polymer is less than 50 cps, sufficient viscosity of the cement slurry cannot be obtained to prevent diffusion, and if the viscosity is more than 5000 cps, the cement slurry The viscosity becomes too large, resulting in a lack of fluidity and difficulty in penetrating the soil layer. Therefore, it is desirable to use a water-soluble polymer having a 1% aqueous solution viscosity of 50 to 5000 cps. Similarly, the amount of water-soluble polymer blended with cement
The range of 0.05 to 5.0 parts by weight per 100 parts by weight is desirable; if it is less than 0.05 parts by weight, sufficient viscosity will not be obtained, and if it exceeds 5.0 parts by weight, the viscosity will become too large and the object of the present invention will not be achieved. There is a possibility that it will not be fully achieved. In carrying out the present invention, when a stratum that is expected to lose mud during mud drilling is encountered, first a cement slurry containing a water-soluble polymer is poured into the excavation hole from the bottom of the mud layer using a drill pipe. It is filled, allowed to permeate into the sludge layer by gravity or by applying pressure, and allowed to stand still to solidify within the sludge layer to close the sludge pores. After that, drilling can be continued using muddy water again. It is also effective to mix mineral fibers, powders or granules such as asbestos, mica, bentonite, or vegetable fibers, powders or granules into the cement slurry used in the present invention. Depending on the situation, additives such as a setting accelerator, a setting retardant, a fluidizing agent, and a water reducing agent may be added. The present invention will be explained below with reference to Examples, but these Examples are not intended to limit the present invention in any way. Example 1 Glass spheres having the four types of particle sizes listed in Table 1 were packed in each cylinder to create a model sludge layer, and the voids in the model sludge layer were filled with water to conduct the following test. . (1) Circulating mud was injected by gravity and the amount of lost mud was measured. (2) Ordinary cement slurry (water/cement ratio = 0.5) that does not contain water-soluble polymers at 1 kg/cm 2
The mixture was injected under pressure to allow it to sufficiently penetrate into the model mud layer, and then left to stand for 2 hours. Thereafter, circulating mud was injected by gravity and pressurized at pressures of 0.5, 1, 3, and 7 Kg/cm 2 , and the amount of mud lost after 30 minutes was measured. (3) Pressurize the cement slurry of the present invention (water/cement ratio = 0.5) containing 1 part by weight of hydroxyethyl cellulose with a 1% aqueous solution with a viscosity of 1200 cps per 100 parts by weight of cement at a pressure of 1 Kg/cm 2 After injecting the solution and allowing it to sufficiently penetrate into the model mud layer, it was left to stand for 2 hours. Thereafter, circulating mud water was injected by gravity and under pressure at 0.5, 1, 3, and 7 Kg/cm 2 , and the amount of evaporated mud was measured after 30 minutes. The above test results are shown in Table 1. From the results in the table, it can be seen that the effect of preventing lost sludge when using the cement slurry of the present invention is remarkable.
【表】
実施例 ２
小坑径（坑径57/8インチ）の掘削現場において
深度720メートル（坑底温度110℃）で中逸泥に遭
遇した。この逸泥防仕対策として、通常のセメン
トスラリーを2050注入し、３時間静置し、再び
掘削を開始したところ、泥水が２循目で同一深度
で再び中逸泥を起した。その後同じ操作を２回ほ
ど繰り返したが、中逸泥は防止できなかつた。こ
こで、実施例１で用いた本発明のセメントスラリ
ー1300を注入し、３時間静置した後再び掘削を
開始したところ、その後深度720メートルでの逸
脱は全くなく、充分な逸泥防止効果があつた。[Table] Example 2 Medium-sized mud was encountered at a depth of 720 meters (bottom temperature 110°C) at a drilling site with a small hole diameter (57/8 inch hole diameter). As a measure to prevent mud slippage, 2,050 ml of normal cement slurry was injected, left to stand for 3 hours, and excavation was started again. However, mud slippage occurred again at the same depth during the second circulation of the mud. After that, I repeated the same operation twice, but I was unable to prevent the accident. Here, when the cement slurry 1300 of the present invention used in Example 1 was injected and left to stand for 3 hours, excavation was started again. After that, there was no deviation at all at a depth of 720 meters, and a sufficient mud slip prevention effect was obtained. It was hot.
Claims (1)
る地層に、セメント100重量部に対し、１％水溶
液粘度が50〜5000センチポイズ（cps）の水溶性
高分子を0.05〜5.0重量部と、水／セメント比＝
0.3〜0.8に相当する量の水とを配合してなるセメ
ントスラリーを注入し、逸泥層に浸透固化させる
ことを特徴とする逸泥防止方法。1. In the well mud drilling method, 0.05 to 5.0 parts by weight of a water-soluble polymer with a viscosity of 1% aqueous solution of 50 to 5000 centipoise (cps) is added to 100 parts by weight of cement to the stratum where mud slippage is expected. /cement ratio=
A method for preventing sludge loss, characterized by injecting a cement slurry mixed with water in an amount equivalent to 0.3 to 0.8, and allowing it to penetrate into the sludge layer and solidify.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1887784A JPS60164593A (en) | 1984-02-03 | 1984-02-03 | Mud escape preventing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1887784A JPS60164593A (en) | 1984-02-03 | 1984-02-03 | Mud escape preventing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60164593A JPS60164593A (en) | 1985-08-27 |
| JPH0368997B2 true JPH0368997B2 (en) | 1991-10-30 |
Family
ID=11983779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1887784A Granted JPS60164593A (en) | 1984-02-03 | 1984-02-03 | Mud escape preventing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60164593A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6145088A (en) * | 1984-08-07 | 1986-03-04 | 住友セメント株式会社 | Sludge escape preventing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644032B2 (en) * | 1973-08-13 | 1981-10-16 |
-
1984
- 1984-02-03 JP JP1887784A patent/JPS60164593A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60164593A (en) | 1985-08-27 |
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