In situ heat systems are a technology that effectively solves paraffin deposition and improves oil recovery. Generally, the oxidation–reduction reaction of sodium nitrite and ammonium chloride generates a large amount of heat to promote the melting of paraffin. An in situ heat system combined with an acid-resistant fracturing fluid system can form an in situ heat fracturing fluid system, which solves the problem of the poor reformation effect caused by cold damage during the fracturing process of low-pressure and high-pour-point oil reservoirs. In this paper, with the goals of system heating up to 50 °C, a low H⁺ concentration, a high exotherm, and reduction of the toxic and harmful by-product NO_X, the preferred in situ heat system was found to comprise 1.6 mol/L ammonium chloride, 1.0 mol/L sodium nitrite, and 0.8% hydrochloric acid. The effect of five factors on the heat production of the reaction was studied experimentally, and a reaction kinetic equation for the in situ heat system was proposed based on the results. The results showed that increasing the concentration of the reactants and lowering the ambient temperature produced more heat. The in situ heat system was used to conduct a crude oil cold damage elimination experiment, and the results of the removal experiments verified that the system could effectively but not completely reduce the cold damage. Overall, the in situ heat fracturing fluid system formed by the preferred in situ heat system combined with an acid-resistant fracturing fluid system could avoid cold damage in the formation during construction and increase the output.

原位加热系统是一种有效解决石蜡沉积并提高采油率的技术。通常，亚硝酸钠和氯化铵的氧化还原反应会产生大量热量，从而促进石蜡的熔化。将原位加热系统与耐酸压裂液体系结合可以形成原位热压裂液体系，解决了低压高注水压裂过程中冷损伤引起的重整效果差的问题。点油库。本文的目标是将系统加热到50°C，低H ⁺浓度，高放热并减少有毒有害副产物NO _X，发现优选的原位加热系统包含1.6 mol / L的氯化铵，1.0 mol / L的亚硝酸钠和0.8％的盐酸。通过实验研究了五种因素对反应热产生的影响，并根据结果提出了原位热系统的反应动力学方程。结果表明，增加反应物的浓度和降低环境温度会产生更多的热量。用原位加热系统进行了原油冷害消除实验，去除实验结果证明该系统可以有效但不能完全减少冷害。全面的，