Бурение грунтовых зондов, установка энергетических колодцев

The mudweight required to kill the well and provide overbalance whilst drilling ahead can be calculated from Equation 1:

Pbh = Pdp + Pmd

The new mud weight must be sufficient to balance or be slightly greater than (i. e. include an overbalance of about 200 psi) the bottom hole pressure. care must

be taken not to weight up the mud above the formation fracture gradient. If an

overbalance is used the equation becomes:

Pkd = Pbh + Pob

Pkd = Pdp + P md + Pdb

Equation 7

or

Pk = Pm + (Pdp + Pobl

d

where,

Pk = kill mudweight (psi/ft)

Pob = overbalance (psi)

Notice that the volume of pit gain (V) and the casing pressure (Pann ) do not appear in this equation, and so have no influence on the kill mud weight.

1.4 Determination of the Type of Influx

By combining equations 1,2 and 3 the influx gradient, Pi can be found from:

pi _ pm " (Pann ~ Pip ) h

i

Equation 8

(Note: The expression is given in this form since Pann > Pdp, due to the lighter fluid being in the annulus)

From the gradient calculated from equation 3 the type of fluid can be identified as follows:

Gas 0.075 — 0.150 psi/ft

oil 0.3 — 0.4 psi/ft

Seawater 0.470 — 0.520 psi/ft

If Pi was found to be about 0.25 this may indicate a mixture of gas and oil. If the nature of the influx is not known it is usually assumed to be gas, since this is the most severe type of kick.

PREPARED BY..

WELL CONTROL KICK SHEET

A

PRE-RECORDED DATA :

CALCULATE : KILL WEIGHT MUD: 1 SIDPP x 20 =_(_________ ) x 20 = DEPTH (TVD) = ( ) 2 SAFETY OR TRIP MARGIN (WHEN NEEDED) = 3 ORIGINAL MUD WEIGHT = 4 KILL WEIGHT MUD (1+2+3) =

DATE

. TIME OF KICK.

PPG PPG PPG PPG

MEASURED DEPTH TRUE VERTICAL DEPTH. LAST CASING SHOE. MAXIMUM ALLOWABLE SURFACE PRESSURE

FT FT FT PSI

PUMP OUTPUT/SLOW PUMP RATES/PRESSURE

E CALCULATE : FINAL CIRCULATING PRESSURE: FCP = (SLOW PUMP PRESSURE) x (NEW MUD WEIGHT) (ORIGINAL MUD WEIGHT)

PUMP 1.

SPM SPM SPM SPM SPM SPM

_ BBL/MIN. BBL/MIN BBL/MIN BBL/MIN BBL/MIN BBL/MIN

PSI PSI PSI PSI PSI PSI PSI

PSI PSI

PUMP 2_

) x (

)

FCP = (

)

FLOATERS:CHOKE LINE FRICTION =

F

CALCULATE : CAPACITIES AND VOLUMES

B

KICK DATA:

1 DRILLSTRING CAPACITY 2 ANNULAR VOLUME OF OPEN HOLE 3 ANNULAR VOLUME OF CASING 4 ACTIVE SURFACE VOLUME 5 TOTAL ACTIVE SYSTEM VOLUME (1+2+3+4)

BBLS BBLS BBLS BBLS BBLS

SHUT IN DRILLPIPE PRSSURE SHUT IN CASING PRSSURE PIT VOLUME INCREASE

PSI PSI PSI

C

CALCULATE : INITIAL CIRCULATING PRESSURE :

1 SLOW PUMP RATE AT SPM =. 2 SHUT IN DRILL PIPE PRESSURE = . 3 INITIAL CIRCULATING PRESSURE (1+2) = .

PSI PSI PSI

G

CALCULATE : PUMPING TIME AND STROKES

. MIN X — . MIN X — MIN X

SPM SPM SPM

STKS TO FIL??? DRILLSTRING STKS TO SHOE

BBLS/MIN BBLS BBLS/MIN BBLS

STKS TO FIL??? CASING

BBLS/MIN

PUMP OUTUT (BBL/MIN) 4 TOTAL MINUTES TO KILL WELL (1+2+3) 4 TOTAL STROKES TO KILL WELL (1+2+3)

. TOTAL MIN

TOTAL STKS

1 SURFACE TO BIT TRAVEL TIME 2 SURFACE TO BIT TRAVEL TIME 3 SURFACE TO BIT TRAVEL TIME

DRILL STRING CAPACITY PUMP OUTUT (BBL/MIN) ANNULAR VOLUME OPEN HOLE PUMP OUTUT (BBL/MIN) ANNULAR VOLUME OF CASING

1 PLOT INITIAL CIRCULATING PRESSURE AT LEFT OF GRAPH

2 PLOT FINAL CIRCULATING PRESSURE AT RIGHT OF GRAPH

3 CONNECT POINTS WITH A STRAIGHT LINE

4 ACROSS THE BOTTOM OF GRAPH WRITE. (A) TIME, SURFACE TO BIT (B) SURFACE TO BIT STROKES AND (C) PRESSURES

2000 Ш СП w 1500 Ш СП CL О Q 1000 < I — 750 z 500 250

2000

“Л

z

1500 о

о

X)

1000 гп

00

750

500

250

A

TIME

B

STKS

C

PRESS

2500

2500

Figure 11 Well Control "Kill Sheet”

%

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