【摘要】 L型水平井在开发低渗煤层气田上具有很大的技术优势,但由于沁南盆地潘河示范区煤层气田储层浅(500～650 m),致使L型水平井具有井斜角大、全角变化率大、斜井段长且水平位移大的特点,加上水平段具有出煤粉严重、井筒气液比高、微含硫化氢的特点,给后期投产排采带来很大难度。为充分发挥L型水平井钻完增产一体化的技术优势,提出了以携带煤粉能力强的特定螺杆泵技术为主体,配套减阻、扶正、防偏磨、井下气液分离、地面注水、智能自控的技术对策。通过现场22口井试验,有效降低偏磨、卡泵和气体影响,消除了硫化氢安全影响,正常运行时率达92.4%,解决了在埋深浅的大井斜大位移井内的有效排采问题,因此建议煤层气L型水平井排采工艺设计中,强携带煤粉能力作为选泵的必要条件,同时应不断完善配套技术,实现工艺运行得更加平稳。研究结果为L型水平井技术在沁南煤层气田的大规模应用奠定了基础,同时也为其他煤层气区块的开发提供了借鉴经验。更多还原

【Abstract】 L-type horizontal wells have great technical advantages in the development of low-permeability coalbed methane fields.However,due to the shallow coalbed methane reservoir in the Panhe demonstration area of Qinnan basin（ between 500 m and 650 m）,Ltype horizontal wells have the characteristics of large well inclination angle,large change rate of overall angle,long inclined shaft section with large horizontal displacement,serious pulverous coal production,high wellbore gas-liquid ratio and slight hydrogen sulfide content,which bring great difficulties to the later production and drainage.In order to give full play to the technical advantages of integrated drilling,completion and production increase of L-type horizontal wells,the countermeasure of screw pump technology with strong pulverized coal carrying capacity as the main body,supporting anti-friction,centralizing,anti-eccentric wear,underground gas-liquid separation,surface water injection and automatic control technology was put forward. Through field tests of 22 wells,effectively reduce eccentric wear,stuck pump and gas effect,eliminate the influence H₂ S safety,normal operation rate was 92.4%.The problem of effective drainage and production in large slant and large displacement wells is solved. Therefore,it is suggested that strong coal powder carrying capacity is a necessary condition for selecting pumps in the drainage and production process design of coalbed methane L-type horizontal wells,and the supporting technologies should be constantly improved to achieve more stable operation of the process.The study result lays a foundation for the large-scale application of L-type horizontal well technology in Qinnan coalbed methane field,and provides reference experience for the development of other coalbed methane blocks.更多还原