钻井液中除硫剂有效含量检测方法及现场试验

在含硫油气井钻井过程中，有效检测钻井液中除硫剂含量的变化，维持钻井液中除硫剂的有效含量，对于保障钻井安全至关重要。为此，基于硫化物反应试剂与锌基除硫剂间的线性作用关系，采用间接法，建立了除硫剂含量与硫化物反应试剂消耗率的关系式，滴定分析了钻井液中硫化物反应试剂的消耗率，基于此提出了钻井液中除硫剂有效含量检测方法。对该检测方法的准确性进行了验证，结果表明:该方法可有效检测钻井液中的除硫剂含量，测定结果相对误差的绝对值<5%。对该检测方法进行了现场试验，试验结果表明，该方法能有效检测钻井液中除硫剂含量的变化，达到及时有效维护钻井液中除硫剂有效含量的目的。研究结果表明，该检测方法满足现场工程应用要求，可有效保障含硫井段安全钻进，同时也能避免除硫剂加量过多造成的浪费。 

A Detection Method for Effective Content of Sulfide Scavenger in Drilling Fluids and Its Field Test

When drilling sulfur-containing oil and gas wells, safe drilling requires effective detecting the change of sulfide scavenger content and maintaining the effective concentration of it in drilling fluids. Given this, according to the linear relationship between sulfide reaction reagent and zinc-based sulfide scavenger, a relational expression utilized the indirect method was established for the content of sulfide scavenger and the consumption rate of sulfide reaction reagent. In addition, the consumption rate of sulfide reaction reagent in drilling fluids was analyzed by titration. Based on the above works, the detection method for effective content of sulfide scavenger was proposed and its accuracy was verified. The results showed that the detection method could effectively detect the content of sulfide scavenger in drilling fluids, with an absolute value of relative measurement error less than 5%. The result of the field test of the method showed that it could effectively detect the content change of sulfide scavenger in drilling fluids, thereby effectively maintaining the effective content of sulfide scavenger in drilling fluids in time. The research results demonstrate that the detection method can meet the requirements of field engineering application, effectively guarantee the safe drilling of sulfur-containing well sections, and avoid the waste of excessive use of the sulfide scavenger.