CNG Product Purchase and Sale Agreement
                  [illegible seal: (Special seal for contract)]

Party A: Zhengzhou Zhongyou Hengran Petroleum Gas Co., Ltd.
Party B: Xi'an Xi Lan Natural Gas Co., Ltd.

Party A and Party B have  reached the  following  agreement  on the matters that
Party B purchases CNG products from Party A through  friendly  consultation:

I. Time of agreement

This  agreement  has a valid term of three years from April 1, 2007 to March 31,
2010,  and it can be  updated  or renewed  if both  parties  agree and  relevant
articles concerning both parties are renegotiated.

II. Gas supply amount

The gas supply amount is  35iA10(4)Nm(3)/day  in this agreement,  (Party A shall
notify Party B three days in advance if gas supply is not  available due to "gas
transportation from west to east" and internal maintenance of the station).  For
the part higher than 10% of the agreed gas supply amount  (including 10%), Party
A will not guarantee  the gas supply;  if Party B needs more gas than the agreed
amount,  Party B shall apply for it three days in advance, and both parties will
discuss with each other the matters  such as the gas amount and the price.

III. Metering

The meter  reading on the  gas-adding  pillar of the  mother  station of Party A
shall be  applicable.  In case of any doubt,  Party B shall  first  perform  the
articles of the agreement and then put it forward for solution by both parties.

IV. CNG Price.

Party B shall be responsible for  organization of  transportation.  The price of
gas at the gas-adding  pillar of each station of Party A is RMB 1.82  yuan/Nm(3)
(including tax). If assistance for transportation is required, the price will be
discussed otherwise.




<PAGE>



V. [illegible]

Under any of the following circumstances during the execution of this agreement,
Party A may change the gas supply amount and the gas price:

1. If the gas is not sufficient to guarantee the gas  compression  amount during
"gas transportation from west to east", Party A may adjust the gas supply amount
by notifying Party B three days in advance;

2. If gas compression can not be conducted during "gas  transportation from west
to east" or equipment  maintenance  in the station,  Party A may suspend the gas
supply by notifying Party B one week in advance;

3. If the  price of gas is  adjusted  during  "gas  transportation  from west to
east",  or the market  supply  and demand are tense,  Party A may adjust the gas
price by notifying Party B one week in advance.

VI. Settlement

Settlement  shall be made on weekly  basis.  Party B shall pay RMB 2.73  million
yuan (two million seven hundred thirty thousand yuan) to the account  designated
by  Party  A as the  advance  payment.  After  both  parties  work  out  the gas
consumption  of the previous  week based on the actual gas  consumption  on each
Monday,  Party B shall make payment for the gas consumed in the previous week to
Party A's  account  by each  Wednesday.

If Party B fails to make payment till Thursday,  Party B is deemed to breach the
agreement,   and  Party  A  has  the  right  to  stop  the  gas   supply.

VII. Responsibilities and obligations of Party A

1. Party A's personnel  shall fill CNG promptly  according to the time specified
by Party B. Party A shall  guarantee  the  continuity  of gas supply  except for
force majeure.

2. CNG  quality  shall meet the  National  GB18047-2000  automobile  gas quality
standards.

VIII. Responsibilities and obligations of Party B

1.  Party B shall make  advance  payment  and the  payment  for gas on  schedule
according  to  this  agreement.

2. Party B shall promptly  report the gas  consumption  amount and ensure steady
gas  consumption.

3. If Party B intends to further  use CNG after  expiration  of this  agreement,
both parties shall consult with each other about the matters of renewal one week
before expiration of this agreement.



<PAGE>



4. If Party B intends to transport gas by itself, it must follow the dispatch of
Party A as well as guarantee  its  transport  vehicles are in  conformity to the
national security standards and industrial specifications.

IX.  Confidentiality  Either  party  should not disclose any article of this CNG
purchase  and sale  agreement  signed  by Party A and  Party B to a third  party
without the  permission of both parties,  otherwise such party will be deemed to
breach the agreement.

X.  Matters not  included  in this  agreement  shall be settled by both  parties
through  consultation.

XI. Any dispute  arising from  execution of this  agreement  shall be settled by
both parties through  consultation.

XII. This agreement has two originals, and each party retains one.

<TABLE>
<CAPTION>
<S>                                               <C>
Party A:                                          Party B:
Zhengzhou Zhongyou Hengran Petroleum Gas          Xi'an Xi Lan Natural Gas Co., Ltd.
Co., Ltd.
[stamp: Zhengzhou Zhongyou Hengran Petroleum      [stamp: Xi'an Xi Lan Natural Gas Co., Ltd.]
Gas Co., Ltd. Special seal for contract]

Representative: [illegible signature]             Representative: [illegible signature]

July 20, 2006                                     July 20, 2006
</TABLE>

<PAGE>



















                                     [stamp: PetroChina Company Limited]


                                                 August 2, 2006

















Subject: Jingbian Project (Letter)
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CC: Natural Gas and Pipeline Branch Company, Changqing Oil Field Branch Company
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President's Office of PetroChina Company Limited     Issued on August 2, 2006
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