XU THE BIEN DO! HE SO SAN PHAM CAC GIENG TANG MONG MO BACH HO TRONG QUA TRJNH KHAI
T H A CTS. Cao My Lgi KS. Mai Van Du XNLD Vietsovpetro
TOM TAT
Tren ca sa phan tich tai lieu khao sat gieng ke tir khi dua via dau tang mong mo Bach Ho vao khai thac den nay, tac gia nhan thay xu the bien doi he so san pham cac gieng khoan a day rat phirc tap.
Ket qua nghien ciru cho thay mac dii he so san pham cua cac gieng cd xu the chung giam dan trong qua trinh khai thac, nhung he so san pham ciia nhieu gieng cd ap suat day Idn han ap suat bao hda lai co chieu hudng gia tang cho den khi ap suat day dat gia tn ap suat bao hda thi he so san pham ciia chung mdi bat dau bi giam dang ke. Doi vai cac gieng trong khi sira chira bi mat dung dich, ludn cd hien tugng he sd san pham ciia chung bi giam manh sau do. Tuang tu, hien tugng giam nhanh he so san pham cung ludn dong hanh vdi cac gieng bi ngap nugc.
Trong bao cao, tac gia trinh bay nhQng nguyen nhan lam thay doi he so san pham cac gieng tang mdng mo Bach Ho trong qua tnnh khai thac va de xuat cac bien phap nang cao hieu qua khai thac cac gieng nay.
GIOl THIEU
Than dau trong da mdng ket tinh md Bach Hd la ddi tugng khai thac chii yeu chiem phan Idn san lugng khai thac ciia toan md. Nghien ciru ti mi he sd san pham se giiip ta dua ra giai phap khai thac va bam ep nude hgp ly nham tang san lugng khai thae cung nhu he sd thu hdi dau.
Odi vdi than dau trong da nirt ne va hang hde ed cau true dja chat phirc tap va khdng ddng nhat nhu da mdng md Bach Hd thi he sd san pham cae gie'ng khoan se ed xu the bie'n ddi phire tap va da dang trong sudt qua trinh khai thac la nhu'ng net ehinh dugc de cap trong bai bao nay.
C A C DANG OLTONG CHI THj C O A C A C GIENG KHAI T H A C TANG MONG M 6 BACH HO
Odi vdi da nirt ne va hang hoc thi viec nghien eiru dang dudng cong ehi thj Q-Ap cd mpt y nghla quan trpng trong viec xac djnh cac yeu td anh hudng den he sd san pham.
Qua ket qua khao sat hang loat eae gie'ng khoan tang mdng, ta nhan thay dp chenh ap Ap d che dp lam viec eiia chung dao ddng trong khoang rat rdng ttr 5 - lOat. den hang ehue tham chi hang tram at.. Gia trj nhd nhat cua Ap khoang 0,5at. va gia trj Idn nhat vao khoang 270at.
Theo gia tri ciia he sd san pham, ta cd the chia toan bd cac gie'ng khoan tang mdng md Bach Hd ra lam 3 nhdm chinh , dd la:
• Nhdm cd he sd san pham d che dp lam viec rat thap Ksp< 5m^/ng.d.at. Nhdm nay bao gdm hau het cac gie'ng ciia khd'i phia Bae mdt sd gie'ng d vung 1, 2 khdi Trung tam.
• Nhdm cd he sd san pham trung binh (5<Ksp<50) bao gdm mdt sd gie'ng ciia vung 1, 2, 3 khdi Trung tam.
• Nhdm cd he sd san pham Idn (Ksp>50) bao gdm cac gie'ng thudc vting 2 , 3 , 4 khd'i Trung tam.
Hinhl Dirdng chi thi cac gieng thuoc nhom 1
Qd, m^/ng.d.
0 100 200 300 400 500 600 700 0«»-
Delta P. at
Du5ng chi thi cac gieng thuoc nhom 2
Qd, m-'/ng.d.
0 200 400 600 800 1000 1200
20 40 60 80
^"^^§5^-*??^
^ " ^ ^ ^ ^
^ < \ v ^
100
v\
Delta P, at
Duong chi thi cac gieng thuoc nhom 3 va nhom dac biet _, . 3 ,
* ^ * Qd, m-'/ng.d, 500 1000 1500 2000
= 4E-06\- -0.0004\
Delta P, at
Hau het eae gieng deu cd dudng chi thj 0 - Ap la dang dudng cong quay be Idi ve phia true X (true luu lugng Q). Qua phan tich, cac dudng cong nay deu dap irng ham bae 2 vdi dp chuan cao Ap = aQ^+bQ (vdi 0.9965 < R'<0.9998).
Qua dd, cho phep ta danh gia hau nhu chi cd he sd ma sat ciia ddng chay rdi trong via (P) la yeu td anh hudng manh den hinh dang cong cua dudng chi thj cdn he sd dan hdi via (a) hau nhu cd anh hudng rat nhd.
Tuy nhien, mdt sd gieng ciia khd'i Trung tam nhu BH403, BH431, BH438, BH462 cd hinh dang dudng chi thj rat phirc tap. Chimg cd dang dudng cong quay be Idm ve phia true X (true luu lugng Q) cung cd dudng chi thj vdi doan dau cd dang Idi, nhung doan cudi lai cd dang 1dm. (Hinh 1)
Nhu vay, trong khi hau het cac gie'ng tang mdng cd he sd san pham la ham giam dan theo su gia tang ciia AP thi mdt sd gie'ng ke tren lai cd xu the tang he sd san pham khi AP tang.
XU THE BIEN 001 HE SO SAN PHAM CAC GIENG TANG MONG TRONG QUA TRJNH KHAI T H A C
Nhu tren chiing ta da biet, he sd san pham cac gieng tang mdng md Bach Ho la ham ciia AP (Ksp = f(AP)) d mdi thdi diem do. Vi vay, he sd san pham ciia mdi gieng d cac lan do khae nhau dugc quy chuyen ve gia trj cd cting AP de tien hanh so sanh, phan tich. Qua phan tich su bien ddi ciia he sd san pham (cd ciing mdt gia tri AP) ciia cac gie'ng trong sudt qua trinh khai thac, chiing tdi nhan thay ed nhu'ng xu the ehinh sau:
• Odi vdi cac gieng khoan cd ap suat via (Pv) va ap suat day (Pd) Idn hdn ap suat bao hda (Pbh) (ke ca nhung gie'ng cd ap suat day nhd han ap suat bao hda nhung cd gia trj dn djnh trong sudt qua trinh khai thac), thi he sd san pham trong giai doan dau cd xu the hai giam theo xu the giam ciia ap suat via. The nhung, bat dau tU gia trj ty suat gitifa ap suat via vdi ap suat bao hoa (Pv/Pbh) dat gia trj ttr 1,35 den 1,1 ta nhan thay cd su gia tang dot bie'n ciia he sd san pham (diem cue dai cd he sd san pham Idn han gia trj ban dau ciia nd khoang 50%). Khi ap suat via bat dau tien den ap suat bao hda (Pv/Pbh = 1,1-1,0), thi gia trj ciia he sd san pham bat dau giam dot ngpt. Trong giai doan nay, khi ap suat day tien tdi ap suat bao hda thi gia tri he sd san pham giam rat manh (cd gie'ng he sd san pham bj giam den 30% so vdi trudc dd). Qua trinh tang, giam he sd san pham d nhieu gieng cdn mang tinh lap lai. Co nghla la, neu cd su gia tang trd lai ciia ap suat via thi he sd san pham cung tang va nguge lai. (Hinh 2)
• Odi vdi cac gieng cd ap suat day nhd han ap suat bao hda va dao ddng manh theo thdi gian, ta cung nhan thay cd su phu thudc ciia he sd san pham vdi gia trj ciia ap suat day. Trong giai doan chuyen tiep khi ap suat day bat dau nhd han ap suat bao hda (Pd/Pbh = 1,0 - 0,9), ta nhan thay cd xu the giam dot bie'n he sd san pham (khoang ttr 20% den 30%). Sau dd, he sd san pham eiia nhieu gie'ng cd xu the giam nhanh theo su giam dan ciia gia trj Pd/Pbh. 6 mdt sd gie'ng, xu the nay cung mang tinh lap lai.
Viec giam he sd san pham do thay ddi ap suat day ed the dien ra ddc lap (neu ap suat via dn djnh) hoae ket hgp ciing vdi xu the bie'n ddi he sd san pham so vdi ap suat via.
• Odi vdi cac gieng trong qua trinh sira chira ma bj mat dung djch, ta nhan thay cd su giam manh he sd san pham the hien d viec luu lugng ciia chiing giam manh sau khi sira. (Bang 1).
• Odi vdi cac gieng bj ngap nude thi he sd san pham cac gieng cung bj giam dang ke theo su gia tang ciia ham lugng nude trong san pham khai thac. Ta nhan thay d nhieu gieng khi dat gia trj ham lugng nude den 30% he sd san pham giam gap 2 lan. Qua phan tich sd lieu ngap nude hien tai ciia cac gie'ng, ta thay mirc dp giam he sd san pham cac gie'ng tang mdng so vdi ham lugng nude dap irng ham: Kt -
n va Kbd - He sd san pham ciia cac gie'ng vao thdi diem trudc khi ngap nude. (Hinh 3)
Ksp, mVng.d.at.
10
BH81. Bien thien he sd san pham theo thdi gian
P/Pbh
l-Nov-93 l-Nov-94 l-Nov-95 31-Oct-96 31-Oct-97 31-Oct-98 31-Oct-99
• - K s p
D - P v / P b h o P<VPbh
Hinh 2
Bien thien he so san pham cac gieng tang mong mo Bach Hd so vdi ap suat via
Ksp. m'/ng.d.at ou 6 0 - 5 0 - 4 0 - 3 0 - zU -1
1
-®cC^5^^^jj.i—.-^
1 \ ; Vf-L^^^^" ~
i \ P : *"^ i 1 Vi • i : Y\
1
» : i 1.1 1 Z 1 i 1.4 1
Pv/Pbh
J 1 0 1
<sp. mVng.d.at.
" Z.4 - 2.2 - 2 - 1.8 - 1.6 - 1.4 - 1.2
^ 1
7 —5—k802
—O—K60
—O—K904
Gidng BH60. Bien ddi he sd san pham theo thdi gian
Ksp, m /ng.d.at.
90
Pv/PblitPd/Pbh) 1.;
I-Sep- 3-Sep- 2-Sep- 2-Sq)- 2-Sq)- 2-Sep- 1-Sep- 1-Sep- 1-Sep- 1-Sep- 90 91 92 93 94 95 96 97 98 99
-Ksp -Pv/Pbh -Pd/Pbh
Bang 1: Bien ddi luu lugng va he sd san pham mdt sd gie'ng thudc mdng md Bach Hd sau khi tien hanh sira chua hoae xir ly day gieng
Ten gieng
BH66 BH73 BH91 BH810
BH81 BH902 BH904 BH1 BH1 BH401
BH90 BH902 BH407
Ngay thang
06/99 03/94 12/93 01/92 07/98 07/98 12/98 03/89 6/90 11/92 04/98 09/97 01/96
Dang cong viec tac dong len gieng
Xir ly day gieng Xir ly day gieng Xir ly day gieng Xir ly day gieng Xir ly day gie'ng Xir ly day gie'ng Xir ly day gie'ng Sira chiifa gie'ng Sira chii'a gie'ng Sira chtra gieng Sira ehtJa gie'ng Sira chira gie'ng Sira ehti^a gie'ng
Li/u lirgng gieng, tan/ng.d.
Trirdc 63 35 28 4 115 157 196 861 620 1370 80 248 1145
Sau 94 175 210 200 445 259 311 696 560 901 40 176 1145
He so san pham, mVng.d. at.
Tri/dc - - - 0.26 1.38 1.5 2.8 - 12
- - - -
Sau - - - 1.63 9.00 6.8 4.0 - 8 - - - -
Hinh 3
Kt/Kbd
Mdng md Bach Ho. Phu thudc he sd san pham vdi dp ngap nude c^c gie'ng khoan.
1 \
0.8 - 0.6 - 0.4 - 0.2 - 0 -
\ ^
o
1 1
o ^
1 1
o
o~"~~
1 1 1 1 1
-0.0241X
y = e R^ = 0.7515
Ham lugng 0 10 20 30 40 50 60 70 80 90 100 nude, %
Ngoai ra, khi tien hanh cac bien phap tang san lugng ddi vdi cae gie'ng ma eho ket qua tdt ta thudng thay ed su gia tang manh eiia he sd san pham. (Cd gieng nhu BH81 len den 6,5 lan). (Bang 1).
KET L U A N
1. He sd san pham cac gieng tang mdng md Bach Hd ed xu the bien ddi dot bien theo thdi gian va phu thudc vao su bie'n ddi ciia ap suat via va ap suat day. Gia trj cao nhat ciia he sd san pham ciia cac gieng dat dugc trong khoang ap suat via bang 1,3 -1,2 ap suat bao hda.
2. Ddi vdi nhu'ng gieng lam viec vdi ap suat day nhd han ap suat bao hda, gia trj ap suat day tdi uu la trong khoang ttr 0,9 den 0,7kg/cml Oe dat dugc che dp lam viec tdi uu ciia cac gie'ng can duy tri ap suat day it bien ddi theo thdi gian.
3. Odi vdi nhO'ng gieng khi tien hanh sira chua can cd bien phap giam thieu viec mat dung djch de tranh dugc viec giam thieu he sd san pham cac gieng.
4. Viec tien hanh cac bien phap tang san lugng ed the gia tang dang ke he sd san pham cac gie'ng khoan tang mdng, tuy nhien viec lua chpn phuang phap cung nhu cac gieng can phai can than de tranh gay ngap nude sdm cac gieng khoan.
5. Can ed che dp bam ep nude va khai thae hgp ly nham tranh gay ngap nude sdm lam anh hudng den san lugng khai thac ciia eae gieng tang mdng.
TAI LIEU THAM KHAO
MHCTpyKUMH no rnjipoxiMHaMHHecKHM MeTO.iiaM MCCjieao-BaHMii n.riacTOB M CKBa>KMH PZl 39-3-593-81. MocKsa 1982.
