Coll 30/146 'Oil: Bahrain Petroleum Company: Annual Reports.' [‎95r] (189/767)

The rate of production from individual wells has been subject to adjustment
from time to time as additional wells were returned to production in the rehabilitation
program; these adjustments were designed to achieve the average Field production rates
indicated for the periods referred to above.
The rehabilitation of secured wells has corrected irregularities in the
drainage pattern from the producing horizons by the provision of additional points of
withdrawal over a greater area. Many of the wells returned to production, however,
show marked decreases in productivity and further work will be necessary before their
ability to produce is restored to that prevailing prior to the Denial Scheme.
GAS INJECTION
The injection of gas into the First and Second Pays has continued throughout
the year without interruption; the gas for this purpose was produced, as in past years,
from the Fourth Pay.
The rate of injection, which is designed to control the advance of extraneous
water into the oil bearing horizons, was increased in November coincident with the
increase in the oil production rate. The ratio of the volumes of gas injected into
First and Second Pays remained constant throughout the year at a value which has been
found suitable for present reservoir conditions.
EDGE WATER ENCROACHMENT
Water production for the year averaged 877 barrels per day as compared with
an average of 595 barrels daily during 1943. The tabulation of oil and water
production data (Tabulation II) shows the daily average water production by months.
The erratic rate of increase of water production indicated by the monthly
figures is the result of the return of wet wells to production in the rehabilitation
program. The majority of these wells are situated on the flanks of the structure