9002010 - Well info

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In the Tamaulipas Superior formation, one production test was conducted in the 2315-

2335 m interval, flowing oil, gas and water; the analyses of samples indicate 18% water

with a salinity of 97500 ppm and pH = 5; these analyses show that the water is acid, thus

coming from the treatment performed on the well, therefore deducing a lack of evaluation

for this interval. The well was plugged as it was deemed non-producing.

The performance per producing unit of the Chicontepec formation will be discussed next.

In the Humapa contracted area, 42 wells are present, out of which 40 were assessed in the

Chicontepec formation; relevant events which occurred during drilling, and which were

detected in 10 wells, low to moderate gasification were encountered, lasting between 10

to 130 minutes; oil impregnations were observed in the cut cores and channel samples.

Chicontepec Superior Canal formation: during the drilling of this producing unit, slight to

moderate gas shows were observed in six wells (Coyol-461, Coyol-5231, Coyol-6076,

Humapa-517, Humapa-537 and Humapa-1024). Regular to light oil impregnations were

observed in cores and cuttings in seven wells (Barita-1, Chorlo-1, Coyol-6074, Coyol-6076,

Humapa-537, Humapa-1074 and Silvita-1).

Production tests were conducted in 33 wells, 28 of which became producers, with their

productions ranging between 10 to 384 bpd, which evidences the attractiveness of this

producing unit. Next is a review of the observations in the producing wells in this member.

In the Humapa-1458 well, no gas shows were observed in the mud while drilling. No cores

were cut and no impregnations in the channel samples were observed.

One production test was conducted in the upper member of the Chicontepec formation,

which turned out to be an oil producer, with an initial rate (Qoi) of 384 bpd, 0% water and

226 m3/m

3 GOR; the well was deemed an oil producer.

Chicontepec Medio Formation: During the drilling of this producing unit, light to moderate

gas shows were observed in two wells (Coyol-461 and Chorlo-1). Regular to light oil

impregnations were observed in cores and channel samples in six wells (Barita-1, Bornita-

1, Humapa-1D, Palmar-1, Chorlo-1 and Silvita-1).

Production tests were conducted in eight wells, six were producers; their production

ranged between 10 and 226 bpd, evidencing the attractiveness of this production unit. The

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following paragraphs present a review of the findings in one well which became a

producer in this member.

In the Bornita-1 well, no gas shows were observed in the mud while drilling. No cores were

cut and no impregnations were observed in the channel samples.

One production test was conducted in the Chicontepec medio formation member, with an

initial rate (Qoi) of 226 bpd; the well was deemed an oil producer.

Chicontepec Inferior Formation: During drilling of this producing unit, light to moderate

gas shows were observed in four wells (Coyol-461, Chorlo-1, Coyol-6058 and Coyol-6096).

Regular to light oil impregnations were observed in cores and cuttings in six wells (Barita-1,

Palmar-1, Chorlo-1, Coyol-6076, Humapa-527 and Silvita-1).

Production tests were conducted in four wells, two were producers, producing in a range

of 63 to 129 bpd, evidencing the attractiveness of this production unit. Next is a review of

the findings in one producing well in this member.

In the Coyol-6058 well, no gas shows in the mud where observed while drilling. No cores

were cut and no impregnations were observed in channel samples.

One production test was conducted in the Chicontepec formation member, with an initial

rate (Qoi) of 129 bpd, 0% water, 286 m3/m3 GOR, the well was deemed an oil producer.

The well geophysical logs were used to produce correlation structural sections; also, the

seismic data was used to correlate de Mesozoic formations' distinctive seismic events. The

figure below illustrates a correlation section with a NW - SE orientation, which sheds light

onto the structural correlation between the Palmar-1, Humapa-1044, Bornita-1 and

Humapa-2073 wells - notice the development of the producing sands of the Chicontepec

formation (Tertiary) in the Humapa-1044 and Bornita-1 wells; also notice that the Palmar-1

well also went through the Upper Jurassic formations, where the hydrocarbon source rocks

are located, currently considered unconventional reservoirs, also known as Oil Shale.

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Exploration and Development History

The Humapa block was discovered in March, 1956 upon drilling the Humapa-1 well,

which was evaluated in the Chicontepec Medio and Inferior formations; during one

formation test, viscous mud was recovered and the well was plugged, deemed non-

producing. The first producing well in the block was Bornita-1, drilled in April 1977,

with a rate of 189 bpd, 0% water and GOR 100 m3/m

3 from the Chicontepec Medio

formation; the Humapa-1D well, drilled later in September 1977 through the

Chicontepec Medio formation produced at a rate of 57 bpd, 0% water and GOR 100

m3/m

3.

In 2010, the operation and maintenance activities were resumed; minor repairs were

conducted to reactivate wells on the Coyotes and Horcones fields, which are on the East

of this block; it is worth mentioning that the average rates of wells prior to reactivation

(April 2010) were 20 bpd for 79 operating wells, averaging 1750 bpd a month; currently

(July 2012), the average rate is 30 bpd for 110 operating wells and an average monthly

production of 3300 bpd.

Drilling activity resumed in 2011 and 2012; three horizontal wells were drilled - two have

been completed to this day: Coyotes 423D and Coyotes 276D, both completed withmultifraccing (five) and the initial rate for the former was 400 bod net oil @ 37°API and

0.471 mmmcfd and 30% water cut, which dropped to 15%; the initial rate for the second

well was 318 bod of oil @28 °API and 0.093 mmcfd of gas and 35% water cut; it is still

undergoing swabbing, therefore the water cut is expected to decrease, as observed in the

first well.

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9002010 - Well info