two very muddy men drilling for oil
Several oil workers in muddy cloths closing off their oil drilling shift
The word several implies more than two and you can't tell if that the men are that the men are closing off their shift. It could be that they just started based on the information given.
exists e1 s1 x1 x2 x3.(a_topic(x1) & for(e1,x3) & n_oil(x3) & Actor(e1,x2) & v_drill(e1) & (x1 = x2) & n_man(x1) & a_muddy(s1) & Theme(s1,x1) & r_very(x1) & card_eq_2(x1))
exists e1 s1 s2 s3 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x3) & a_off(s3) & Manner(e1,s3) & Theme(e1,x5) & Actor(e1,x4) & v_close(e1) & n_shift(x5) & of(x5,x6) & n_drilling(x6) & of(x5,x2) & n_oil(x2) & n_oil(x2) & of(x5,x1) & n_thing(x1) & (x3 = x4) & n_cloth(x3) & a_muddy(s2) & Theme(s2,x3) & n_worker(x1) & of(x1,x2) & a_several(s1) & Theme(s1,x1))