US 12,168,912 B1
Downhole hydraulic directional control valve used by hydraulic power pumps and working method thereof
Bing Guan, Jinan (CN); Baozhong Ma, Jinan (CN); Sifeng Bi, Jinan (CN); Meng Liu, Jinan (CN); Xuejiang Li, Jinan (CN); Chao Gao, Jinan (CN); and Xingbao Teng, Jinan (CN)
Assigned to SHANDONG WEIMA PUMPS MANUFACTURING CO., LTD, Shandong (CN)
Appl. No. 18/716,191
Filed by SHANDONG WEIMA PUMPS MANUFACTURING CO., LTD, Shandong (CN)
PCT Filed Nov. 29, 2023, PCT No. PCT/CN2023/135085
§ 371(c)(1), (2) Date Jun. 4, 2024,
PCT Pub. No. WO2024/114684, PCT Pub. Date Jun. 6, 2024.
Claims priority of application No. 202211519304.X (CN), filed on Nov. 30, 2022.
Int. Cl. E21B 43/12 (2006.01); E21B 34/10 (2006.01); F04B 47/04 (2006.01)
CPC E21B 34/10 (2013.01) [F04B 47/04 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A downhole hydraulic directional control valve used by a hydraulic drive pump, comprising:
a valve body assembly, comprising a shell, an outer tube is provided in the shell, a first passage is formed between the outer tube and the shell, the outer tube is sleeved at a top end of a middle joint sleeved at a bottom end of an upper cylinder, a top end of the upper cylinder is connected with an outer cylinder, a second passage being formed between the outer cylinder, the upper cylinder, and the outer tube, a third passage is formed between the outer cylinder and an inner cylinder provided in the outer cylinder, top ends of the outer cylinder and the inner cylinder are connected with a double-way joint, a central hole of the double-way joint is communicated with the second passage and is further provided with an oil inlet hole communicated with the third passage, an inner space of the upper cylinder is communicated with the second passage, and an inner space of the middle joint is communicated with the first passage;
a valve core assembly, comprising an upper valve core and a lower valve core positioned at a bottom end of the upper valve core, wherein the upper valve core is positioned in the upper cylinder and a fourth passage is formed between the upper valve core and the upper cylinder, and the lower valve core is positioned in a lower cylinder positioned at a bottom end of the middle joint; wherein,
a top end of the upper valve core is provided with a first annular boss, the first annular boss is in clearance fit with an inner surface of the upper cylinder, a bottom end of the upper valve core is provided with a second annular boss, a top end of the lower valve core is sleeved and fixed on a periphery of the second annular boss and is in fit with the lower cylinder, a fourth passage is formed between the first annular boss and the second annular boss, and a sum of cross-sectional areas of the second annular boss and a bottom end of the lower valve core is larger than across-sectional area of the first annular boss;
and, a plunger assembly, being configured to pass through the valve core assembly and comprising a first plunger part positioned in the inner cylinder and a second plunger part provided at a bottom end of the first plunger part, a top end of an inner space of the second plunger part is communicated with the third passage, and a liquid inlet hole, matched with an inner valve chamber of the lower cylinder, is further provide on the second plunger part;
wherein,
the second plunger part comprises a first section, a second section and a third section provided in sequence, wherein the first section is connected with the first plunger part through a first joint, a third liquid inlet hole communicated with the first section is provided on the first joint, the first section further is communicated with the second section through a second joint, a fourth liquid inlet hole communicated with the first section is provided on the second section, the second section is connected with the third section through a third joint, and a fifth liquid inlet hole communicated with the third section is provided on the third joint;
the first plunger part is disposed inside the inner cylinder, such that the third liquid inlet hole is communicated with the third passage; and
a space above the first plunger part is an upper valve chamber, a space below the upper valve core and between an inner surface of the lower valve core and the second plunger part is a lower valve chamber, and the lower valve chamber is located in the lower cylinder, the fourth inlet hole and the fifth inlet hole are matched with the lower valve chamber, and can realize a switching of On/Off states along with a movement of the plunger assembly.