1. 準備 前 置く ジャー 間 穴あけ に 井戸
(1) 穴あけ ジャー 出荷 から the factory or sent to the well must pass ground tests and can be put into use only after passing the test.
(2) チェック かどうか 上 と 下 jar スピンドル 完全に 緩めます. In order to prevent the mandrel from closing on the ground, a clamp device is specially configured to clamp on the exposed end of the mandrel, as shown in Figure 7-6. It cannot be removed until the tool is connected to the drill string and before entering the well.
(3) いつ 調整 the shock force of the lower hammer, ensure that the adjusted shock force should not exceed the drill string mass above the jar under any circumstances. How to adjust the shock force:
Remove the adjusting ring locking pin and adjust it on the test stand to the designed compression release force, that is, the shock tonnage. When the adjusting ring is turned in the increasing direction, in order to increase the shock force, each time the adjusting ring is turned one hole, the load changes by about 10~30kN. After adjustment, tighten the locking screw plug.
(4) 前 行く 下 well, check whether the oil plugs are loose. Is the穴あけ ジャー IN A ロック 状態?
2. 掘削 操作
(1) リフト 準備 ジャー オント ドリル 床 with a リフティング サブジョイント, 適用 シーリング グリース アンド 接続 it to the drill string. リフト ドリル ツール and remove the clamp on the mandrel (should be kept properly)。
(2) 厳格 制御 穴あけ 速度 時 穴あけ に 防ぐ 突然 妨害 で 直径 減少 ポイント, which 意志 原因 下向き ハンマー に ある 解放された に 農産物 a downward stroke。
(3) If the downstroke has occurred, the upstroke device will inevitably return to the pre-shock state. At this time, the drill string should be lifted slightly upward, the lower hammer should be slid back into place, the operation should be suspended for a few minutes, wait for the upper hammer to be released, and be careful not to lift it violently.
(4) During the process of drilling and tripping, the tongs should bite at the specified position when removing the thread. After drilling, the jar should be in the open state. After installing the mandrel clamp at the wellhead, remove and weave the column into the drill pipe box. Never allow any clamping and lifting tools to be stuck in the open part of the mandrel to prevent damage to the the mandrel.
(5) The 穴あけ ジャー is always in the fully extended state during raising and lowering in the well.
(6) If the jar is no longer used, the surface must be cleaned, the exposed mandrel part should be smeared with butter, and the drill floor should be removed safely to prevent impact.
3. ノーマル ドリル
(1) The jar drills under tension。
The jar is in an open state during the entire drilling process under tension, and the the mandrels of both parts are in a stretched state. The quality of the drill collar in the lower part of the jar and the force exerted by the pump pressure on the mandrel and flush pipe of the upper striking part and the the mandrel and scraper sleeve of the lower striking part all contribute to the opening of the tool. The jar works best under tension。
(2) 穴あけ ジャー 加圧。
The jar can also drill under pressure, but the pressure exerted on the tool cannot exceed the pre-adjusted jar tonnage and pump pressure exemted on the jar mandrel and scraper body before the jar is lowered into the well. Half of the sum, the force exerted by the the pump pressure on the 穴あけ ジャー is determined with reference to Figure 7-7.
(3) いつ the jar is pressurized for drilling, the upper hammer may be closed. When lifting the drill string, a slight upward shock may occur due to the mass of the lower drill string.
(4) 関係なく の かどうか jar is drilling under tension or pressure, the drill must be fed evenly to prevent the drill from slipping or skipping。
(5) If you encounter a jam during the drilling process, you can activate the upper clicker to release the jam。
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