1 2 2 Nghien cdu de xuat doTi pha chi dung djch khoan gdc dau tdng hop de...
NGHIEN CUtJ DE XUAT DON PHA CHE DUNG DICH KHOAN GOC DAU TONG HOP DE KHOAN TANG MONG M O BACH HO VA
CHO CAC GIENG KHOAN DONG BANG SONG HONG
Ta Quang Minh, Le Thj Minh Tam, Biii Trudng Giang Le Trudng Thjnh, Ngd Thanh Mai, Nguyin Anh Phuang Cdng ty Dung dich khoan vd Hod phdm Ddu khi
TOM TAT
Dung dich khoan gdc nude dugc cho la nguyen nhdn gdy ra nhirng su cd khd khde phuc khi khoan mdng md Bgch Hd vd giing khoan a bdn triing Sdng Hdng. nai cd nhicng
dac diim dia chdt phirc tgp ddc trung. Nghien cim vd lua chgn dung dich khoan gdc ddu tdng hgp Id cdn thiit nhdm ndng eao hiiu qud khoan khai thde ddu khi ciia cdc viing md ndy. Dung dich khoan gdc ddu tdng hgp thi hien nhirng tinh chdt im viet ve dp bdi tron vd ire chi set, bdo todn tinh thdm chica ciia via, ldm tdng tdc dp khoan gdp phdn ldm gidm gid thdnh giing khoan.
Bdo cdo trinh bdy tdm tdt nhirng kit qud nghien cim trong phdng thi nghiem di dua ra mpt sd dan pha chi dung dich khoan gdc ddu tdng hgp cho khoan tdng mdng md Bgch Hd vd cdc giing khoan thupe bdn triing Sdng Hdng.
GIOT THIEU
Mdt trong nhirng cdng doan quan trgng nhat trong cdng tac thi edng gieng khoan tham dd hoae khai thac dau khi la khau khoan md via san pham. Cd nhieu yeu td quyet djnh den cdng tac md via san pham nhu tinh chat tham chiia ciia via, ap suat via, loai san pham chira trong via, chiing loai va chat lugmg cua dung djch, thdi gian md via va cac cdng nghe, thiet bi ggi ddng sau dd. Dung djch khoan gde dau tdng hgp dang dugc cac cdng ty nude ngoai sir dung rdng rai cho khoan tim kiem tham dd va khai thac ma d nude ta chua cd mdt cdng trinh nghien ciiu nao mang tinh he thdng, vi vay, chimg tdi cho rang nghien cim sir dyng dung djch khoan gdc dau tdng hgp cho ddi tugng mdng Bach Hd va cac tang san pham d cac gieng khoan thuge ddng bang Sdng Hdng la rit cip thilt. Tai md Bach Hd, mdt mat do gradien ap suat via thap dj thudng, mat khae ting chiia san pham thudng bj nut ne cao, khi khoan thudng xay ra mat dung djch d cae mirc do khae nhau (1,59m den 80m^) gay tdn kem ve kinh te, thdi gian, can den nhumg bien phap khdng che phiic tap.
Ngoai viec giai quyet van de md via san pham, ddi vdi cae gieng khoan d ddng bang Sdng Hdng, dung djch khoan se dugc nghien ciiu ap dyng cho ca cac thanh tao vdi dja tang ehira set nhay cam vdi nude nham dn djnh thanh gieng, nang cao tdc do khoan va ha gia thanh gieng khoan. Trong qua trinh khoan, cac dac tinh collector viing can day giing xau di la do tac ddng ciia cac dung djch gdc nude dugc sir dung. Dung djch khoan gdc diu dugc sir dung ngay cang nhieu dap img cac yeu cau ngay cang cao ve chat lugmg md via
Tuyin tap bio cio Hgi nghj KHCN "30 nim Diu khi Viet Nam: Cff hgi mdi, thach thu c mor 123 san pham. Thanh cdng trong nghien ciiu img dyng he nhii tuomg nghjeh dugc danh gia d:
mirc do bao tdn tinh chit di dudng ty nhien cua via, dai ty trgng dung djch, cac tinh chit luu biin - ciu tnic, dac tinh thim lge, cac dae tinh eiia cdng nghe khai thac va ca chi phi hgp ly.
Dau tdng hgp phai dap irng dugc cac yeu cau:
• Khdng ddc va cd ham lugmg hydrocarbon thom thap
• Do nhdt ddng hgc thap
• Nhiet do bit chay ldn ban 100°F (3 8°C)
• Nhiet do chay deo phai thap hon nhiet do mdi trudng de de bom day
• Diem anilin hon 65°C ed y nghia lam giam sy pha buy cac chi tiet duge che tao bang eao su.
• Khdng phat huynh quang
Bang 1 Tinh chdt vdt ly eua ddu parafin tdng
hgp Trang thai Do nhdt: d 100°C
d40°C Nhiet do chay deo, "C Diem ddng dac, °C Nhiet do bit lira, °C
Ty trgng dung djch d 60°F (15,5°C) Diem anilin, °C
Ham lugng chat ran (mg/l) Kha nang trdn lan vdi nude bien Thanh phan hda hgc
Paraffin mach thang Tetradecene Ham lugng chat tham Nhiet do sdi
Bit diu sdi, "C Sdi cudi, °C
DduMCP-1257C (ESSO-Mobil)
Chat long l,17cSt 2,71cSt
-3 124 779 kg/m^
66 Khdng
55 H- 65% trgng lugng 15 H- 25% trgng lugng
DduEDC-95-Il (Total-Phdp)
Chat long 3,5 cSt
-27 814kg/m^
91
0,003%
255 325
De cd dung djch khoan gdc dau tdng hgp dn djnh trong mdt khoang thdi gian tdi thieu theo yeu cau sir dyng thi nhat thiet can phai cd it nhat mot hoae nhieu chat hoat ddng be mat. Can cii vao tinh hinh thj trudng va gia thanh cua cac chit HDBM, chung tdi chgn he tao nhii gdm hdn hgp cac axit beo cd mach cac bon C14.17, cae amin (hay polyamin) va cae hdn hgp ciia chiing ciing nhu hdn hgp vdi cae chit thim udt nhu cac dan xuat cua
124 Nghien cdu de xuat don pha chi dung djch khoan goc dau tdng hgp de-
amin va chat lam dac dan xuat tir cac dime, trime va imidazonline ciing nhu ca cac amin bae cao.
Chiing tdi xac dinh dugc ham lugng chat tao nhu tuong img vdi cac ty le D/N khae nhau qua cac thi nghiem:
Bang 2
Ty le D/N
Ham lugng chat tao nhu, % the tich
50.07;
1,5
60/40 1,6
70/30 1,70
80/20 1,8
KET QUA NGHIEN ClTU DON PHA CHE DUNG DICH KHOAN GOC DTH CHO KHOAN TANG MONG MO BACH HO
Ting mdng md Bach Hd nim d do sau ldn (3000 -f 5000m), ap suit thudng cd gia trj 300 -r 400at, nhiet do dao ddng 140 - I SOT. Dudi tac ddng ciia cae ylu td nay (dac biet la nhiet do cao), dung djch thudng bj loang ra (do cac polymer bj phan hiiy cau true), nen lam giam dang ke tinh chat luu bien ciia dung djch khoan.
Ap suit via ting mdng giam: trong qua trinh khai thac ap suat via giam xudng cdn 0,8 - 0,9, trong khi dd vdi dilu kien thyc tl ciia XNLD Vietsovpetro chi cho phep sir dung dung djch gde nude cd ty trgng ldn hon 1 lam chenh ap suat giira cdt dung djch va via rat ldn, dung djch dl di vao via theo cac ddi nirt ne, gay tdn thit dung djch va anh hudng xau din via san phim. Sy chenh lech ap cung se ngay cang tang trong qua trinh khai thac md, nen mat dung djch trong tang mdng nirt ne se ngay cang tram trgng.
Thanh phin thach hgc da mdng khdng ddng nhat, xen ke nhumg ddi da ran chac la nhirng ddi da de bj dap vd, tao ra cac ddi nirt ne nam xen ke giiia cac khdi da ran chac, dac xit. Chinh he thdng khe nirt, hang hde day dac, va sy lien thdng giira cac Id hdng, khe nirt nay da dan den sy cd mat dung djch rat tram trgng tai day.
Bang 3: Cac tinh chat co
Thanh phan
D a u E D C 9 5 - l l , m ' Chat tao nhu, lit Chat on djnh nhu, lit Chat tham uat, iit Set huu ca, kg C.giam thai nude, kg Ca(0H)2, kg
Nuac bien, in"
CaClj (0 - 39%) p, g/em' BaSOVCaCOj
ban dung djch goc DTH (THBH) d u o c de xuat Ham lugmg, tinh cho
Im' D/N:
60/40 0,54
16 8,6 2,86
11 13 16 0,36 0-246
0,89 1,04 p>l,04
D/N:
70/30 0,656 17
9 5,72
22 12 17 0,27 0-199
0,87 0,99 p>0,99
D/N:
80/20 0,745 18 8,58 5,72 23,5 12 18 0,19 0-143
0,85 0,93 p>0,93
P (g/cm'')
0,9 1,15
FV (s)
40 50
PV (eP)
13 32
YP (lb/
lOOft")
11 22
Gel (lb/
lOOft")
8-20/
17-53 FL (cm')
2 5
ES (von)
330 1370
Tuyin tap bio cio Hgi nghj KHCN "30 nim Dau khi Viet Nam: Ca hgi mdi, thach thde moi" 125 Bang 4: Danh gia kha nang chju nhiem ban ciia THBH voi ty le dau nude 60/40
Mdu Mau nen: TKN
SKN Md phdng chat ran Nude bien
Mudi Carnalite
AV 24,5
29 56 38 36
PV 19 22,5
34 30 28
YP 11 13 34 16 16
Gel 7/14 7/17 13/31
8/19 7/18
6 rpm 5 5 13
6 6
ES MOV 220V 200V 152V 113V
FL @250"F
20ml - - -
Ghi chu:
TKN: trudc khi nung mdu a I21°C trong thdi gian 16 gid SKN: sau khi nung mdu a nhiet dp 120°F (49°C)
Bang 5 : Ket qua thi nghiem danh gia phijc hoi do tham cua dung dich THBH
T T
1 2
3
4 5 6
Logi dung dich khoan THBH
80/20 THBH
70/30 THBH
65/35 THBH
60/40 THBH
55/45 THBH
50/50
Sd hieu mdu
BH- 426.7-9 Tl BH- 446.6-3-73
BH-406.4-18
BH-425.1-18 BH-425.2 4-104
BH-901.4-2-22
Chieu sdu,
m
4203 3986
4206
3831 4500 4253
Dp rdng
%
1,4 3,9 2,9
3,1 3,0 2,8
Dp bdo hod nude,
%
13,5 19,3
17,3
15,4 19,7 21
Dp thdm ban ddu
(kl), mD
516 184
189
191 357 433
Dp thdm ddu sau tdc dpng eua DDK(k2)
mD
454 164
166
162 293 346
He sd phuc hdi
dp thdm (k2/kl)
0,88
0,89
0,88
0,85
0,82
0,80
Tang mdng la tang chiia san pham do dd dung djch khoan gdc DTH dugc sir dyng khoan md via san pham. De ed anh hudng it nhat, bao toan tinh chat eoleetor va phii hgp vdi dieu kien dja chat mdng, dung djch gdc dau phai la he nhii tuong ben, chju nhiet den 150°C va cd ty trgng nhd de tao ra ap suat edt thuy tinh tuong duong vdi ap suat via. Viec lya chgn dung djch khoan gdc DTH se dap img tdt ve tinh bdi tron, chju nhiet va dieu chinh ap suat edt ap dung djch can bang ap suat via, vi vay^segiam mat dung djch do tuan hoan.
Dieu chinh ty trgng ciia dung djch khoan gdc DTH dugc thyc hien bang viec dieu chinh ty le D/N hay bang ham lugmg mudi ciia pha nude. Trong khudn khd ciia bao cao chiing tdi chi cd the gidi thieu don pha che dung djch THBH tren loai diu paraffin tdng
126 Nghien cdu de xuit doTi pha chi dung djch khoan gdc diu tdng JTg£Jg::i
hgp EDC-95-11. Viee nghien ciiu tren dau nen cd do nhdt thip bom MCP 1257C chi cd tinh chit tham khao va viec tim tren thj trudng khd ban.
Chung tdi tiln hanh thi nghiem xac djnh kha nang chju nhiet va nhiem ban eua THBH 60/40, ty trgng 0,97g/cm-' theo each them chit rin khoan md phdng d miic do nhilm bin 10% trgng lugng vao biin, trdn deu, nung ndng mau d 121°C (250°?) trong 16 gid do mau.
Kit qua cho thiy cac mau THBH ty le D/N: 65/35, 70/30 va 80/20, cd gia trj he so phye hdi do tham cao.
Nhu vay, viec nghien ciiu ap dyng dung djch THBH chiing td phii hgp vdi cae dieu kien ciia mdng md Bach Hd, dac biet kha nang pha chi dung dich cd ty trgng nhd (gradien ap suit nhd hon I) tao ra cdt ap can bing vdi ap suat thap ciia mdng niit ne md Bach Hd.
Dilu nay khdng thi thye hien dugc ddi vdi cac he dung djch khoan gdc nude.
KET QUA NGHIEN ClTU DON PHA CHE DUNG DICH KHOAN GOC DTH CHO KHOAN GIENG KHOAN THUOC BON TRUNG SONG HONG (THSH)
Nguyen nhan anh hudng din ggi ddng.- ddi tugng chiia dau khi ciia mien vdng Ha Ndi la cac tap eat ket Oligocen va Miocen, thudng xen ke vdi cac ldp bdt ket mdng, ham
lugng xi mang set - carbonat cao nen cd do rdng, do tham kem den trung binh.
Tang chiia Oligocen va Miocen dudi ed sy gan ket bdi xi mang set, carbonat. Cat ket thudng la lithic hoae lithic - arko vdi thanh phan manh set < 15%), xen ke cac ldp than va via than mdng. Tang chira Miocen giira, cat ket gan ket yeu, xi mang gan ket ehii yeu la set trong dd thanh phan chinh la cao lanh va cd mat montmorillonit. Da chiia eat ket diep Phil Cir chat xit. Thanh phan ciia xi mang chii yeu la thuy mica, cao lanh va it hon la clorit. Mirc chira clorit tang tuong ddi ve phia Tay Nam ciia mien vdng. Diep Phong Chau xi mang ciia cat ket la cao lanh set, ddi chd la canxit va cd chiia dxyt sat.
Sy cd mat cua khoang set anh hudng ldn den do tham va do rdng ciia da chiia, nhat la trong qua trinh tiep xuc vdi dung djch khoan gdc nude. Cac khoang set deu cd dac tinh ua nude dugc bieu hien d bai dae tinh hydrat hda truong nd (nhu cac khoang set montmorilonite, hydro clorit, v.v...) va tinh phan tan. Dac tinh truang nd cua set bieu hien d chd set hydrat hda khi tiep xuc vdi nude lam co that va bjt kin kenh dan. Dac tinh phan tan ciia set bieu hien d chd cae hat set trong mdi trudng nude bj phan tan thanh eae hat co sd cd kich thudc cd micron, de dang djch chuyen theo ddng chay va tich dgng d nhiing vj tri "ed chai" eiia kenh cho den khi lam tac nghen ddng chay. Day cd the duge cho la mdt trong nhirng nguyen nhan chinh anh hudng den edng tac ggi ddng ciia cac giing khoan MVHN. Nd dat ra cho viec nghien eiiu ap dyng he dung djch khoan phai lic chi tot khoang set va cd tinh hoan nguyen ddi vdi via chira san pham, khae phye tinh ua nude cua cac khoang set.
1. Xac djnh do khoang hoa mudi ciia mau loi set ket
Khi dung djch khoan THSH tilp xuc vdi da philn set, hien tugng thim thiu xuit hien tuy thudc vao do khoang hda cua dung dich THSH va cua da phien. Tinh ire ehi chi
Tuyin tap b i o c i o Hgi nghj KHCN "30 n i m DJu khi Viet Nam: Cff hgi mdi, thach thde mdi" 127 thi hien khi do khoang hoa eiia dung djch va cua da phien set can bang nhau.
Thi nghiem xac djnh do khoang hda ciia da phien set d gieng khoan ddng bing Sdng Hdng cd thi dugc diing de xac djnh ham lugng mudi CaCl2 can thiet cho dung djch THSH.
Do khoang hda cua cac mau da phien set thude tang chan Mioxen ciia viing triing Sdng Hdng d khoang 20% - 25%).
Dung djch THSH cd tinh chat lie che set tdt dugc diing de khoan md via va khoan qua tang chan phia tren.
• C a a 2 5% •CaC12 10%
• C a a 2 20% CaC12 25%
•CaC12 15%
• CaC12 30%
Hinh 1: Kha nang thu hoi cutting vdi cac dung djch co nong do CaCh khae nhau Thanh phan eiia dung djch THSH duge de xuat cho khoan md via cho gieng khoan bdn triing sdng Hdng dugc dua ra d Bang 6.
Bang 6: Thanh phan va tinh chat ciia THSH cho khoan md via san pham
Thdnh phdn
Diu EDC 95-1 l,m^
Chat tao nhii, lit Chat dn dinh nhii, lit
Chat tham udt, lit Set hiru co, kg C giam thai nude, kg
Ca(0H)2, kg Nude, m^
CaCb (20%), kg Barit/CaCOs, kg
Hdm licgng, tinh cho Im^
D/N:
70/30 0,57
17 8,6 5,7 17 11,5
17 0,242
92 600
D/N:
75/25 0,61
17,5 8,6 5,7 17,5 11,5 17,5 0,21 75 620
D/N:
80/20 0,65
18 10 5,7 18 11,5
18 0,17
60 640
P g/
cm
1,2 1,44
FV s
45 55
PV cP
20 39
YPlb/
lOOft^
14 25
Gel lb/
lOOft^
8-22
/
9-72 FL cm
3 5
ES V
560 150
0
128 Nghien cdu de xuat don pha che dung dich khoan goc dau tdng hgp o^-
2. Kha nang lie chi cua dung dich THSH doi vdi mau loi set kit dja ting mien vong Song Hdng
Phucmg phap duge ap dung d day la thi nghiem tinh hoan nguyen ciia set. Phuong phap nay dya tren co sd danh gia do bao toan cac hat set sau khi cho mau tiep xiic vdi cac dung djch khoan cd cac thanh phin khae nhau. Ty le cutting duge thu hdi sau thi nghiem cang cao va ty le phin ed hat ldn cang cao thi anh hudng ciia dung dich len miu cutting cang nhd - dung djch cang cd tinh lie che.
Cae dung djch khoan dugc sir dung la:
- Dung djch nhu tuong nghich THSH
- Dung djch ANCOo 4000 (PHPA/KjSOVpolyme/Glycol) - Diu nIn EDC-95-11 (dugc coi la dung djch lic chi tot nhit) - Nude (lie che kem nhat)
Ty le thu hdi cutting doi vdi dung djch THSH la 95%) Idn hon so vdi 68,9%) ddi vdi dung dich ANCO 4000. Phin cd hat to thu dugc cung nhilu hom 85,9%) so vdi 55,1%), chi it hon diu nIn EDC-95-11 dat 99,1%. Trong khi dd, ddi vdi nude la 0%. Dung djch THSH cd tinh lie ehi tot hom nhilu so vdi ANCO 4000.
lO 3
E -o
Ji 3
H
KI)
«)•
«)•
7) fl) 5) 4)
?IU 2) 10 0
0 i).5 1.5 15 :' ;v5 4
Cff la mju till Ivi (mri
Hinh 2: Dvdng cong thu hoi cutting doi vdi cac he dung djch khae nhau Bang 7: Ket qua thi nghiem cac don pha che dung djch khoan goc DTH sir dung cho
cong doan 8 l/2inch cua gieng khoan d dong bang Song Hong vdi cac ty If D/N khae nhau
Thanh phan dung dich
Ty le D/N
Ty trgng
Diu EDC-95-1 l,m^
Nude, m^
Chat tao nhii, lit C. dn djnh, lit Chat tham udt, lit
70/30 1,2
g/cm^
0,570 0,252 17 10 5,72
1,32 g/cm^
0,568 0,252 17 10 5.72
1,44 g/cm^
0,543 0,242 17 8,6 5,72
80/20 1,32 g/cm^
0,646 0,16
18 8,6 5,72
1,44 g/cm''
0,62 0,16 18 8,6 5,72
Tuyin tap bao cao Hgi nghj KHCN "30 nam Piu khi Viet Nam: Co hgi moi, thach thde moi" 129 Chat giam thai nude, kg
Set hiiu ca, kg Ca(0H)2, kg Barit-DMC, kg CaCb. kg
11,45 15.73 17 442 91.5
11.44 15,7
17 442
92
11,45 12 17 596
88
11.45 14.3 18,6 486 60.4
11.44 17.2
18 639
58 Thdng sd dung dich
TKN
SKN
V 600/300 PV
YP Gel ES
HTHP FL V 600/300 PV
YP Gel ES
HTHP FL
56/36 20 16 12/21
580 3,2 60/37
23 14 11/44
950 4.0
68/43 25
18 10/27
680 L4 91/56
35 21 16/55
1320 2
67/42 24
16 13/29
620 1.4 79/47
32 15 20/52
1000 2
63/40 23 17 8/9 800 1.2 74/46
28 18 13/50
1500 1.6
64/40 24
16 9/30
860
85/51 34
17 22/73
1375 1.8
Thanh phan dung dich
Bang 8: Danh gia Ty le D/N
Ty trgng EDC95-ll.m^
Nude nggt, m^ ' Chat tao nhu, lit Chat dn djnh, lit Chat tham udt, lit Chat giam thai nude, kg Set htm CO chju nhiet, kg Ca(0H)2, kg
Barite. kg CaCL. kg
kha nang c 60/40 1,2g/cm^
0,51 0,36 16 5,72
2,9 11,5
7,2 11,5 280 96
hju nhiem ban ciia THSH 70/30 1,2g/cm^
0,606 0,263 17
6 2,86
11.5 14,3 17 293 96
l,32g/cm''
0,58 0,25 17,2 6 7 11,5
13 13 449
92
1.44g/c m"' 0.54 0,24 17,2 6 6 11,5 14,3 14,5 623
88
80/20 l,44g/
0.54 0,24 18 8.6 5.7 11,5
21 18 619
63
130 Nghien cdu de xuit don pha chi dung dich khoan goc diut6ngJigjJjj£:i
Thdng .so dung dich
Khdng nhiem ban
10%
nude
10%
set ket
10%
set OCM
A
10%
chat ran khoan
V 600/300 PV, cP
YP, Ib/lOOsqft Gel 0/10, lb/1 OOsqft ES, V
HTHP FL, ml V 600/300 PV, cP
YP, lb/1 OOsqft Gel 0/10, lb/1 OOsqft ES,V
HTHP FL, ml V 600/300 PV, cP
YP, lb/1 OOsqft Gel 0/10, lb/1 OOsqft ES, V
HTHP FL, ml V 600/300 PV.cP
YP, lb/1 OOsqft Gel 0/10, lb/1 OOsqft ES,V
HTHP FL, ml V 600/300 PV,cP
YP, lb/1 OOsqft Gel 0/10, lb/1 OOsqft ES,V
HTHP FL, ml
64/41 23
18 13/20
400 1,7 87/57
30 27 19/24
340 3,4 Ldn Ldn Ldn Ldn 110 4,6 95/61
34 27 17/20
60 2,4
56/36 20
16 12/21
580 2,8
55/35 20
15 9/16
450
80/52 28 24 22/29
450
72/44 28 16 13/23
130
90/59 31 28 18/27
140 2,4
65/42 23
19 16/26
530 1,6 167/101
66 35 38/41
310 1,8 85/46
39 7 15/26
300 2,2 95/63
32 31 23/36
240 1,4 85/46
39 7 15/26
300 2,2
64/40 24 16 9/30
860 1.4 80/52
28 24 28/44
970 2,6 74/44
30 14 10/29
330 2 89/59
30 29 27/42
590 2,2 74/44
30 14 10/29
330 2 Ket qua nghien ciru dung djch khoan gdc dau trong phong thi nghiem da trinh bay d tren cho thay:
• Thanh phan va tinh chat cua dung djch THSH dugc dua ra la co sd dl pha che va dieu chinh trong qua trinh sir dung. Thi nghiem kha nang dung nap cac chit trong phdng thi nghiem cho thiy dung djch THSH cd kha nang chju tat ca cac nhilm ban thudng gap. Dung djch ty le D/N: 60/40 chi dugc khoan vdi thanh tao chira it set, cd mirc ham lugng dit da khoan phan tan trong dung djch nhd han 10% va ty
Tuyin tap bao cao Hgi nghj KHCN "30 nam Dau khi Viet Nam: Co hoi moi, thach thde moi" 131
trgng khdng ldn ban l,2g/cm''.
• Kha nang lie chi dat 99.7%) ciia dung djch THSH tren cac miu ldi set kit cho thay uu diem ciia dung dich THSH vdi gia trj ham lugng khoang hda ciia mau ldi set ket dugc xac dinh phii hgp.
Da chiia d bdn triang Sdng Hdng cd do rdng, do tham nhd va trong thanh phan thach hgc cd chira khoang set, dudi tac ddng cua dung djch THSH khdng bi hydrat va truong na THSH cho ket qua phye hdi do tham rat tdt. Ket qua danh gia nay cd y nghla quan trgng de cai thien kha nang ggi ddng ve sau.
Bang 9: Ket qua thi nghiem danh gia khii nang phuc hoi do tham ciia THSH voi cac ty le D/N 60/40, 70/30 va 80/20 tren mau loi mien vong Song Hong
Sd hieu mdu
0 75-1087 34-1014 1007
Chieu ddi. cm
5,99 5,42 6,93 5,72
Duong kinh,
cm 3,72 3,78 3,76 3,76
Dg thdm khi, mD
932,1 1365 303,7 184,7
Dp rdng
% 22,6 19,87 18,96 20,87
MD 626,9 915,8 206,4 128,9
K2 mD 457,6 796,76 187,84 116,01
Logidd khoan ANCO 4000 THSH 60/40 THSH 70/30 THSH 80/20
ILe sd phuc hdi do thdm
(krh)
0,73 0,87 0,91 0,90 Ket qua cho thay kha nang phuc hdi do tham ciia dung djch gdc DTH cao han so vdi dung djch polyme gdc nude da dugc sir dung d ddng bang sdng Hdng (0,73 so vdi gia tri thap nhat 0,8, cai thien dugc 15%; va 0,91 cai thien 21%).
3. Danh gia kha nang boi tron ciia dung djch khoan gdc DTH
Viee danh gia kha nang bdi tron cua dung djch khoan dya tren nguyen ly sy giam ma sat tren may do do nhdt EF Electronical Lubricity Tester-FANN cua phdng thi nghiem DMC va tuan theo chi tieu ky thuat RD 2002 ciia Vien NIPI - XNLD Vietsovpetro.
1 0.9 0.8 0.7 0.6 0.5 0.4 0.3^
0.2
o.H
0
Distil. DD ben Water
TH2 50/50
TH2 60/40
TH2 TH2 70/30 80/20
Hinh 3: Bieu do kha nang boi tron ciia cac dung djch khae nhau (Chii y: TH2 - ky hiiu ciia dung dich gdc ddu paraffin tong hgp)
132 •Jghien cdu de xuit don pha chi dung djch khoan goc d a u j o ^ g j l g j l j g : : !
Ket qua thi nghiem the hien tren so dd cho thiy dung djch khoan tren nen DTH paraffin d cac ty le D/N khae nhau deu cd gia tri he sd ma sat rit nhd va thip hon so vdi dung djch tren co sd bentonit tir 66% den 71%, gia trj nay ciing nhd hon so vdi dung djch khoan polyme/PHPA/K2S04/Glycol. Nhu vay, kha nang bdi tran ciia dung dich gdc DTH tdt ban han tat ca cac dung djch da dugc sir dung.
4. Danh gia do doc hai ciia dung djch khoan goc DTH ddi voi moi trudng Bang 10: Danh gia do doc hai ciia THBH va THSH
Sinh vdt thi nghiem Au triing tdm su {Penaeus monodon) Vi khuan phat quang {Photobacterium Phosphorum)
Thdi gian
96 gid 5 phut 15 phut
Chi lieu xdc dinh LCjo (ppm-SPP)
EC50 (ppm-SPP)
EC50 (ppm-SPP)
Chdt thu nghiem THSH
264.430 753.796 692.562
THBH 248.706 786.054 774.440
KsCrzOy 14,7 119,0 109.0
Ddi vdi au triing tdm sii, LC50 > 30.000ppm dugc quy djnh khdng ddc hai; LC50 <
30.000ppm la ddc. Nhu vay, cac dung djch khoan tren cac dau nen parafin tdng hgp la khdng ddc (THSH va THBH la dung djch khoan gdc DTH dugc pha chi tren 2 loai diu nen parafin tdng hgp cd phan doan sdi khae nhau).
KET LUAN
• Da lya chgn loai dau parafin tdng hgp lam pha diu nIn cd ty trgng tuong irng la 0,779 va 0,814, do nhdt ddng hgc 2,71cSt va 3,5cSt (d 40"C), cd thanh phin hda hgc va cac tinh chat vat ly dat yeu ciu an toan vl chay nd va sire khoe.
• Thiet lap don pha chi dung djch THBH cd ty trgng nhd hon Ig/cm' dl tao ra cdt ap dung djch phii hgp vdi ap suat thap di thudng cua mdng, nhim giam tdi thilu mat mat dung dich vao mdng. Ty trgng ciia dung djch THBH dugc dilu chinh bing ty le D/N (ham lugng thi tich pha nude) va ham lugng mudi CaCL cua pha nude.
• Ham lugng mudi CaClz thich hgp ciia pha nude la 20% trgng lugng. Ty trgng dung djch THSH dugc dieu chinh bing barit hay CaCOj. Kha nang uc chi khoang set ciia dung djch bing thi nghiem kha nang thu hdi mau Idi vun cao hon so vdi cua dung djch polyme/PHPA/KsSOVGIycol la 26% cho thiy kha nang bao toan tinh tham chiia ty nhien ciia via chira va kha nang dn dinh thanh giing khoan ciia THSH rit eao.
• Xac djnh dugc kha nang bdi tron ciia dung djch khoan gdc dau tdng hgp: he so ma sat ciia DTH giam mdt each tuang ddi thap hon so vdi dung dich set bentonit va thap nhat dat 72% trong khi dung dich khoan polyme/PHPA/K^SO /Glycol thip nhit la 33%.
Tuyin tap bao cao Hgi nghj KHCN "30 nam Dau khi Viet Nam: Co hgi mdi, thach thde moi" 133
• Kit qua danh gia do ddc hai theo chi tieu LC50 d 96 gid va EC5y cua THSH \ a
•THBH cho thay cac dung djch nay khdng ddc hai. Kha nang phan huy sinh hgc cua THSH dat 68,21% va THBH 58,42%.
TAI LIEU THAM KHAO
\. Tdng cdng ty Dau khi Viet Nam, 2000. Hdi nghi Khoa hgc cdng nghe 2000 "Ngdnh Ddu khi truac thim thi ky 2r. Tap I, II. NXB Thanh Nien, Ha Ndi.
2. Tdng cdng ty Dau khi Viet Nam, 1998. Cdc quy dinh ve bdo vi mdi truang trong chi biin ddu khi, thdm dd khai thde, phdt triin md, sdn xudt, bao qudn, van chuyen. gia cdng vd dich vu. NXB The Gidi, Ha Ndi.
3. Trung tam Nghien cim Phat trien An toan va Mdi trudng Dau khi, 1999. Hdi thao mdi trudng " Vi viec sir dung dung dich khoan gdc ddu khodng vd goc ddu tdng hgp a biin
Viet Nam'\ Ha Ndi, 28-4-1999.
4. Nguyen Dire Huynh, Hoang Thai Lge, Hoang Nguyen va n.n.k., 1998. Nghien cim dnh huang ciia viec sic dung dung dich khoan gdc ddu cd dp dpc thdp ddi vdi mdi trirang biin Viet Nam. Tap chi Diu khi, Sd 1/1998.
5. Truang Bien, Tran Dinh Kien, Le Van Thang, Lam Thanh Phudc, 1997. Dung dich khoan tdng hgp - Mpt tiin bp mai trong cdng tdc khoan ddu khi. Tuyen tap cac cdng trinh khoa hgc Dai hgc Md - Dja chat, Tap 25, thang 10-1997.
6. J.E. Friedbeim, 1997. Second-generation synthetic drilling fluids. JPT, July 1997.
7. John A. Veil, Christopher J. Burke, David O. Moses, 1996. Synthetic-based muds can improve drilling efficiency without polluting. Oil & Gas Journal. Mar. 4. 1996.
8. D.F. Jacques, H.E. Newman Jr., W.B. Turnbull, 1992. A comparision of field drilling experience with low-viscosity mineral oil and diesel muds proceedings. Drilling Conference. New Cleans. lADC/SPE 23881, p. 341 - 354.
9. George R. Gray, H.C.H. Darley, 2000. Composition and properties of oil well drilling fluids'". Production Pperation Overview. March 2000.
10. Mercer et al., 1992. Oil-base drilling fluid comprising branched chain paraffins such as the dimer ofl-decene. United States Patent 5096883, March 17. 1992.
ll.Patel et al., 1993. Oil based synthetic hydrocarbon drilling fluid. United States Patent 5189012, February23, 1993. '