SHANGHAI, July 24 (Reuters) - The People's Bank of China (PBOC) conducted a net injection of 18 billion yuan ($2.90 billion) into the banking system this week, according to Reuters' calculations.  
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       The PBOC has drained a net 15 billion yuan from the market so far in 2014.     The PBOC injected a net 113.8 billion yuan into the market in 2013. For a table on the PBOC's open market operations in 2013, click:  
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            Following is a summary of the PBOC's weekly open market operations this year (in billions of yuan):    Week       Bills    Repos     Reverse   Bills    Repos    Reverse    Net drain  starting   matured  matured   repos     issued   issued   repos      (-) or                                issued*                     matured*   injection  21-Jul              18                           0                   18  14-Jul     5        50                           -38                 17  7-Jul               80                           -30                 50  30-Jun     15       70                           -30                 55  23-Jun              30                           -18                 12  16-Jun              65                           -50                 15  9-Jun               184                          -80                 104  2-Jun      23       120                          -70                 73  26-May              50                           -30                 20  19-May              185                          -65                 120  12-May     40       188                          -184                44  5-May               60                           -120                -60  28-Apr              141                          -50                 91  21-Apr              183                          -185                -2  14-Apr              226                          -267                -41  7-Apr               232                          -177                55  31-Mar              100                          -162                -62  24-Mar                                           -98                 -98  17-Mar              78                           -126                -48  10-Mar              160                          -200                -40  3-Mar               108                          -178                -70  24-Feb                                           -160                -160  17-Feb                                           -108                -108  10-Feb                                                    -450       -450  27-Jan                        150                         -75        75  20-Jan                        375                                    375  13-Jan                                                                 6-Jan                                                                                                                                         TOTAL                                                                -15  * Reverse repos inject funds on issuance and drain funds on maturity.      Note: Reuters calculations of maturing bills and repos count any debt maturing on the weekend as maturing the following week, as that is when banks receive the cash. ($1 = 6.1982 Chinese Yuan)   (Compiled by Chen Yixin and the Shanghai Newsroom; Editing by Anupama Dwivedi)  ((yixin.chen@thomsonreuters.com))  Keywords: CHINA OPENMARKET/WEEKLY